This document discusses tools and techniques for troubleshooting fiber optic networks. It describes visual fault locators, optical loss test sets, optical fault finders, and optical time domain reflectometers as the primary tools used. It explains how each tool can identify issues like breaks, scratches, contamination, bending, and splicing problems. The document also covers best practices for using optical time domain reflectometers, including how to interpret test results and optimize settings.
This document provides best practices for field testing fiber optic cables. It recommends cleaning and inspecting all connectors using a fiber optic microscope. Loss testing with an Optical Loss Test Set is required by standards to measure attenuation, while using an Optical Time Domain Reflectometer is optional but provides additional information. Proper cleaning, inspection, and testing helps identify issues to enable troubleshooting of fiber optic networks.
This document discusses testing and loss measurement techniques in optical fiber communication systems. It describes how optical time domain reflectometry (OTDR) is commonly used to characterize optical fibers and locate faults by measuring backscattered light. OTDR can measure splice and connector losses, fiber quality, and reflectance. Other techniques mentioned include using a light source and power meter to check continuity and measure insertion loss. The document provides a table comparing the capabilities of different fiber testing equipment and concludes that both OTDR and optical loss test sets provide important loss measurement information to ensure healthy optical fiber communication.
The document provides information about using an OTDR (Optical Time Domain Reflectometer) to test fiber optic cables. It discusses:
1. What an OTDR is and how it works by generating light pulses and measuring the backscatter and reflections.
2. The basic setup requirements for an OTDR including range, pulse width, index of refraction, and averaging time.
3. How to connect an OTDR to a fiber using launch and receive cables and analyze the trace to measure loss, distance, and locate faults.
4. Additional functions of OTDRs like storing and loading traces, zooming, and different OTDR module types.
This document discusses Luna Innovations' Optical Backscatter Reflectometer (OBR) which uses Optical Frequency Domain Reflectometry (OFDR) to provide high precision fiber optic measurement. OFDR works by interfering reflected light from the device under test with a reference light from a swept laser. The OBR can detect discrete losses from defects as well as distributed losses along optical fibers. It measures return loss and insertion loss with resolutions down to -130dB and 10-80μm. Examples are provided to demonstrate how the OBR can identify macrobends, cracks, connector quality and other issues in single mode and multimode fiber setups.
Testing effectiveness of the splice through otdr and power meter testsBala V
The document discusses testing the effectiveness of fiber optic splices using optical time domain reflectometry (OTDR) and power meter tests. It describes how an OTDR works by sending light pulses into the fiber and analyzing backscattered signals to locate events like connectors, splices, and faults. The document outlines how to use an OTDR to measure splice loss, cable length, and total loss. It also discusses using a power meter in conjunction with an OTDR or independently to measure optical loss in the fiber under test.
As the use of fiber in premise networks continues to grow, so do the requirements for testing and certifying it. An optical time-domain reflectometer (OTDR) is an electronic-optical instrument used to characterize optical fibers. It locates defects and faults, and determines the amount of signal loss at any point in an optical fiber. This article describes how an OTDR works and the key specifications that should be considered when choosing an OTDR.
An Optical Time Domain Reflectometer (OTDR) injects optical pulses into fiber optic cables and measures the light that is scattered or reflected back to characterize the cable. It can measure the distance, loss, and other properties of fusion splices, connectors, bends, and other components in the cable. An OTDR is used to test the integrity of fiber optic cables and diagnose problems.
The document provides information about using an OTDR (Optical Time Domain Reflectometer) to test fiber optic cabling. It discusses how an OTDR works, generating a baseline trace of a cable link and identifying events. It also covers fault location, different OTDR types, and how to properly configure OTDR settings like range, pulse width, index of refraction, and averaging time to obtain accurate test results. Analysis methods like two-point loss measurements and LSA lines are also summarized.
This document provides best practices for field testing fiber optic cables. It recommends cleaning and inspecting all connectors using a fiber optic microscope. Loss testing with an Optical Loss Test Set is required by standards to measure attenuation, while using an Optical Time Domain Reflectometer is optional but provides additional information. Proper cleaning, inspection, and testing helps identify issues to enable troubleshooting of fiber optic networks.
This document discusses testing and loss measurement techniques in optical fiber communication systems. It describes how optical time domain reflectometry (OTDR) is commonly used to characterize optical fibers and locate faults by measuring backscattered light. OTDR can measure splice and connector losses, fiber quality, and reflectance. Other techniques mentioned include using a light source and power meter to check continuity and measure insertion loss. The document provides a table comparing the capabilities of different fiber testing equipment and concludes that both OTDR and optical loss test sets provide important loss measurement information to ensure healthy optical fiber communication.
The document provides information about using an OTDR (Optical Time Domain Reflectometer) to test fiber optic cables. It discusses:
1. What an OTDR is and how it works by generating light pulses and measuring the backscatter and reflections.
2. The basic setup requirements for an OTDR including range, pulse width, index of refraction, and averaging time.
3. How to connect an OTDR to a fiber using launch and receive cables and analyze the trace to measure loss, distance, and locate faults.
4. Additional functions of OTDRs like storing and loading traces, zooming, and different OTDR module types.
This document discusses Luna Innovations' Optical Backscatter Reflectometer (OBR) which uses Optical Frequency Domain Reflectometry (OFDR) to provide high precision fiber optic measurement. OFDR works by interfering reflected light from the device under test with a reference light from a swept laser. The OBR can detect discrete losses from defects as well as distributed losses along optical fibers. It measures return loss and insertion loss with resolutions down to -130dB and 10-80μm. Examples are provided to demonstrate how the OBR can identify macrobends, cracks, connector quality and other issues in single mode and multimode fiber setups.
Testing effectiveness of the splice through otdr and power meter testsBala V
The document discusses testing the effectiveness of fiber optic splices using optical time domain reflectometry (OTDR) and power meter tests. It describes how an OTDR works by sending light pulses into the fiber and analyzing backscattered signals to locate events like connectors, splices, and faults. The document outlines how to use an OTDR to measure splice loss, cable length, and total loss. It also discusses using a power meter in conjunction with an OTDR or independently to measure optical loss in the fiber under test.
As the use of fiber in premise networks continues to grow, so do the requirements for testing and certifying it. An optical time-domain reflectometer (OTDR) is an electronic-optical instrument used to characterize optical fibers. It locates defects and faults, and determines the amount of signal loss at any point in an optical fiber. This article describes how an OTDR works and the key specifications that should be considered when choosing an OTDR.
An Optical Time Domain Reflectometer (OTDR) injects optical pulses into fiber optic cables and measures the light that is scattered or reflected back to characterize the cable. It can measure the distance, loss, and other properties of fusion splices, connectors, bends, and other components in the cable. An OTDR is used to test the integrity of fiber optic cables and diagnose problems.
The document provides information about using an OTDR (Optical Time Domain Reflectometer) to test fiber optic cabling. It discusses how an OTDR works, generating a baseline trace of a cable link and identifying events. It also covers fault location, different OTDR types, and how to properly configure OTDR settings like range, pulse width, index of refraction, and averaging time to obtain accurate test results. Analysis methods like two-point loss measurements and LSA lines are also summarized.
An OTDR is used to test optical fibers by emitting light pulses and measuring the intensity of light reflected back over time to detect fiber damage, splice and connector losses, and overall length. It contains a laser, photodiode, and timing circuit. The OTDR detects defects by analyzing the returned light pulse intensities and times. Settings like pulse width and range can be adjusted based on the fiber length and needed accuracy of measurements.
The document discusses common issues with fiber optic cables and connections. The most frequent causes of fiber optic failures are broken fibers from bending, insufficient transmitting power, excessive signal loss from long cable spans, contaminated connectors, faulty splices, and too many splices or connectors. Each connector introduces 0.5-0.75 dB of loss and each splice introduces about 2 dB of loss. Troubleshooting involves inspecting cables for damage, checking connections are secure, and cleaning connectors if dust is present.
This document discusses optical time domain reflectometry (OTDR) which is used to locate faults in optical fibers. It operates by launching light pulses into the fiber and analyzing the backscattered light to map the fiber. Key points covered include:
- OTDR works by measuring backscattering from Rayleigh scattering and Fresnel reflections over time to characterize the fiber.
- Features in the OTDR trace like losses and reflections indicate fiber quality or breaks.
- Parameters like pulse width and averaging time must be set correctly to get an accurate trace with good resolution of events.
The document provides an overview of optical fundamentals and testing techniques. It begins with introductions to fiber optics, fiber characteristics, and optical loss testing. It then discusses specific testing methods and concepts in more detail, including attenuation, insertion loss, optical return loss, connectors, visual fault locators, live fiber detectors, and OTDRs. The document provides explanations of key optical terms and how different testing equipment operates to evaluate fiber optic networks.
One of the advantages of fibre optic cabling is its ability to be joined several times in the same installation run. This is also helpful if you are in need of a fibre cable repair
This document provides an overview of using an OTDR (Optical Time Domain Reflectometer) to test fiber optic cabling. It discusses OTDR functionality and how to properly set up the device, including setting the range, pulse width, index of refraction, and averaging time. It also covers analyzing OTDR traces to evaluate specific events and faults along a cable span.
Subscribers are often complaint about not finding any information about fiber optics aimed specifically at them. Because most materials about fiber optics is written to train optical technicians, people who have no experience in telecommunication can not understand these industry standards. So they have to ask an optical technician for help every time they met a problem or even a tiny error. Today’s article has provided detailed information so that end users can find answers to their questions on fiber optics.
This document discusses a novel reflector-based method for real-time monitoring of passive optical networks (PONs) without interrupting data traffic. The method uses reflectors placed at customer locations that reflect a monitoring wavelength back to the central office, allowing an optical time domain reflectometer (OTDR) to locate faults. The reflectors provide improved spatial resolution over conventional OTDR methods and allow monitoring of up to 32 branches of a PON. The passive, low-cost reflector technology allows easy installation and remote fault diagnosis, improving network maintenance efficiency.
CompTIA exam study guide presentations by instructor Brian Ferrill, PACE-IT (Progressive, Accelerated Certifications for Employment in Information Technology)
"Funded by the Department of Labor, Employment and Training Administration, Grant #TC-23745-12-60-A-53"
Learn more about the PACE-IT Online program: www.edcc.edu/pace-it
Nd At S Best Practices For Single Mode Tier I Ii Testing 01 2011Dean Murray
1. The document outlines best practices for tier 1 and tier 2 fiber optic cable testing, including cleaning connectors, visual inspections, optical loss testing, and optical time domain reflectometer (OTDR) testing.
2. It describes how to set a single jumper reference for optical loss testing and how to generate an OTDR baseline trace to identify anomalies like splices, connections, and reflections.
3. Proper techniques for cleaning connectors, setting references, analyzing OTDR traces, and identifying common anomalies are discussed to ensure accurate fiber testing.
The document provides an overview of fiber optic technology including:
- The basics of how optical fibers transmit light via total internal reflection
- The different types of optical fibers like single-mode, multi-mode, and their variations
- Components used in fiber optic systems like connectors, adapters, splitters, and attenuators
- Causes of loss in optical fibers including absorption, scattering, modal dispersion, and more
- Applications of fiber optics in telecommunications, networks, and more
An OTDR is an instrument used to test fiber optic cables by launching an optical signal and analyzing the return signal. It can measure attenuation, length, and losses from splices and connectors. The basic principle is that it works like an optical radar. Key factors for OTDR setup include range, pulse width, index of refraction, and averaging time. OTDRs can identify events along a cable and be used for fault location and documentation. Trace analysis involves using cursors to measure losses and lengths. Limitations include difficulty resolving short distances in LAN environments.
An OTDR is an instrument used to test optical fibers which works like an optical radar. It evaluates fiber optic link characteristics and measures fiber parameters such as attenuation, length, and loss. The document discusses OTDR operational principles, basic setup requirements including range, pulse width, and index of refraction. It also covers OTDR types, testing and trace analysis procedures, and limitations in testing short-distance fibers.
An OTDR is an instrument used to test optical fibers which works like an optical radar. It evaluates fiber optic link characteristics and measures fiber parameters such as attenuation, length, and loss. The document discusses OTDR operational principles, basic setup requirements including range, pulse width, and index of refraction. It also covers OTDR types, testing and trace analysis procedures, and limitations in testing short-distance fibers.
Detection of Underground Cable Fault using ArduinoIRJET Journal
This document describes a system to detect faults in underground cables using an Arduino. It uses Ohm's law - a voltage is applied to the cable and the current measured to determine faults. Resistors represent distances along the cable where fault switches can induce faults. When a fault occurs, the voltage change is read by the Arduino and the fault location displayed on an LCD in kilometers. The system can detect common fault types like line-ground and line-line faults. It is meant to more easily locate underground cable faults compared to traditional methods that require digging to find faults.
Nd at s best practices for single mode tier i ii testing 01-2011Dean Murray
The document discusses selecting and operating Optical Time Domain Reflectometers (OTDRs) for fiber optic cable testing. It compares OTDRs to Optical Loss Test Sets (OLTS) and describes how OTDRs can provide additional information about individual connections, splices and fiber sections compared to OLTS. It reviews different OTDR models from Noyes including the M200, M700, OFL280 and C850 and how to set them up and perform basic OTDR operations and testing.
Guide to Fiber Optic Jumper Cable SelectionJo Wang
Fiber optic jumper cables are available in OS1, OS2 single-mode and OM1, OM2, OM3, OM4 multimode types. Both ends of the optical cable are terminated with a high performance hybrid or single type fiber optic connector, such as SC connector, ST connector, FC connector, LC connector, MTRJ connector, or E2000 connector in simplex or duplex. There are so many kinds of fiber optic patch cables for various applications. How to choose right fiber optic patch cables for your networks? This post provides a selection guide for you.
Analysis on The Impact of Reflectance in Optical Fiber Linksijtsrd
An optical fiber link is a part of an optic fiber communication system. Other components of the optic fiber link include the transmitter, connectors, and the receiver. The optical fiber could be single-mode (for long distance transmission) or multi-mode (for short distance transmission). This paper however, majors on the impact of reflectance in the single-mode optical fiber. Reflectance is a hidden threat that increases Bit Error Rate, BER, (rate at which errors occur in transmission system) and reduces system performance if not monitored or controlled. Optical Time Domain Reflectometer (OTDR) was used to measure the reflectance in single-mode fiber. Events measurements in OTDR heavily depend on good reflectance. The OTDR was able to establish the reflectance in every portion of the fiber under test. An average reflectance level of -14.9275 dB of 1550 nm signal over the span length of 20.422 km was achieved which is within the acceptable standard range. Hence, good quality performance transmissions can be achieved along these routes. J. Ilouno | M. Awoji | J. Sani"Analysis on The Impact of Reflectance in Optical Fiber Links" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: http://www.ijtsrd.com/papers/ijtsrd14378.pdf http://www.ijtsrd.com/physics/other/14378/analysis-on-the-impact-of-reflectance-in-optical-fiber-links/j-ilouno
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECTjpsjournal1
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
China is seeing significant success in commerce, pipeline politics, and gaining influence on other
governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
Cooperation Organisation and the Belt and Road Economic Initiative.
A SYSTEMATIC RISK ASSESSMENT APPROACH FOR SECURING THE SMART IRRIGATION SYSTEMSIJNSA Journal
The smart irrigation system represents an innovative approach to optimize water usage in agricultural and landscaping practices. The integration of cutting-edge technologies, including sensors, actuators, and data analysis, empowers this system to provide accurate monitoring and control of irrigation processes by leveraging real-time environmental conditions. The main objective of a smart irrigation system is to optimize water efficiency, minimize expenses, and foster the adoption of sustainable water management methods. This paper conducts a systematic risk assessment by exploring the key components/assets and their functionalities in the smart irrigation system. The crucial role of sensors in gathering data on soil moisture, weather patterns, and plant well-being is emphasized in this system. These sensors enable intelligent decision-making in irrigation scheduling and water distribution, leading to enhanced water efficiency and sustainable water management practices. Actuators enable automated control of irrigation devices, ensuring precise and targeted water delivery to plants. Additionally, the paper addresses the potential threat and vulnerabilities associated with smart irrigation systems. It discusses limitations of the system, such as power constraints and computational capabilities, and calculates the potential security risks. The paper suggests possible risk treatment methods for effective secure system operation. In conclusion, the paper emphasizes the significant benefits of implementing smart irrigation systems, including improved water conservation, increased crop yield, and reduced environmental impact. Additionally, based on the security analysis conducted, the paper recommends the implementation of countermeasures and security approaches to address vulnerabilities and ensure the integrity and reliability of the system. By incorporating these measures, smart irrigation technology can revolutionize water management practices in agriculture, promoting sustainability, resource efficiency, and safeguarding against potential security threats.
An OTDR is used to test optical fibers by emitting light pulses and measuring the intensity of light reflected back over time to detect fiber damage, splice and connector losses, and overall length. It contains a laser, photodiode, and timing circuit. The OTDR detects defects by analyzing the returned light pulse intensities and times. Settings like pulse width and range can be adjusted based on the fiber length and needed accuracy of measurements.
The document discusses common issues with fiber optic cables and connections. The most frequent causes of fiber optic failures are broken fibers from bending, insufficient transmitting power, excessive signal loss from long cable spans, contaminated connectors, faulty splices, and too many splices or connectors. Each connector introduces 0.5-0.75 dB of loss and each splice introduces about 2 dB of loss. Troubleshooting involves inspecting cables for damage, checking connections are secure, and cleaning connectors if dust is present.
This document discusses optical time domain reflectometry (OTDR) which is used to locate faults in optical fibers. It operates by launching light pulses into the fiber and analyzing the backscattered light to map the fiber. Key points covered include:
- OTDR works by measuring backscattering from Rayleigh scattering and Fresnel reflections over time to characterize the fiber.
- Features in the OTDR trace like losses and reflections indicate fiber quality or breaks.
- Parameters like pulse width and averaging time must be set correctly to get an accurate trace with good resolution of events.
The document provides an overview of optical fundamentals and testing techniques. It begins with introductions to fiber optics, fiber characteristics, and optical loss testing. It then discusses specific testing methods and concepts in more detail, including attenuation, insertion loss, optical return loss, connectors, visual fault locators, live fiber detectors, and OTDRs. The document provides explanations of key optical terms and how different testing equipment operates to evaluate fiber optic networks.
One of the advantages of fibre optic cabling is its ability to be joined several times in the same installation run. This is also helpful if you are in need of a fibre cable repair
This document provides an overview of using an OTDR (Optical Time Domain Reflectometer) to test fiber optic cabling. It discusses OTDR functionality and how to properly set up the device, including setting the range, pulse width, index of refraction, and averaging time. It also covers analyzing OTDR traces to evaluate specific events and faults along a cable span.
Subscribers are often complaint about not finding any information about fiber optics aimed specifically at them. Because most materials about fiber optics is written to train optical technicians, people who have no experience in telecommunication can not understand these industry standards. So they have to ask an optical technician for help every time they met a problem or even a tiny error. Today’s article has provided detailed information so that end users can find answers to their questions on fiber optics.
This document discusses a novel reflector-based method for real-time monitoring of passive optical networks (PONs) without interrupting data traffic. The method uses reflectors placed at customer locations that reflect a monitoring wavelength back to the central office, allowing an optical time domain reflectometer (OTDR) to locate faults. The reflectors provide improved spatial resolution over conventional OTDR methods and allow monitoring of up to 32 branches of a PON. The passive, low-cost reflector technology allows easy installation and remote fault diagnosis, improving network maintenance efficiency.
CompTIA exam study guide presentations by instructor Brian Ferrill, PACE-IT (Progressive, Accelerated Certifications for Employment in Information Technology)
"Funded by the Department of Labor, Employment and Training Administration, Grant #TC-23745-12-60-A-53"
Learn more about the PACE-IT Online program: www.edcc.edu/pace-it
Nd At S Best Practices For Single Mode Tier I Ii Testing 01 2011Dean Murray
1. The document outlines best practices for tier 1 and tier 2 fiber optic cable testing, including cleaning connectors, visual inspections, optical loss testing, and optical time domain reflectometer (OTDR) testing.
2. It describes how to set a single jumper reference for optical loss testing and how to generate an OTDR baseline trace to identify anomalies like splices, connections, and reflections.
3. Proper techniques for cleaning connectors, setting references, analyzing OTDR traces, and identifying common anomalies are discussed to ensure accurate fiber testing.
The document provides an overview of fiber optic technology including:
- The basics of how optical fibers transmit light via total internal reflection
- The different types of optical fibers like single-mode, multi-mode, and their variations
- Components used in fiber optic systems like connectors, adapters, splitters, and attenuators
- Causes of loss in optical fibers including absorption, scattering, modal dispersion, and more
- Applications of fiber optics in telecommunications, networks, and more
An OTDR is an instrument used to test fiber optic cables by launching an optical signal and analyzing the return signal. It can measure attenuation, length, and losses from splices and connectors. The basic principle is that it works like an optical radar. Key factors for OTDR setup include range, pulse width, index of refraction, and averaging time. OTDRs can identify events along a cable and be used for fault location and documentation. Trace analysis involves using cursors to measure losses and lengths. Limitations include difficulty resolving short distances in LAN environments.
An OTDR is an instrument used to test optical fibers which works like an optical radar. It evaluates fiber optic link characteristics and measures fiber parameters such as attenuation, length, and loss. The document discusses OTDR operational principles, basic setup requirements including range, pulse width, and index of refraction. It also covers OTDR types, testing and trace analysis procedures, and limitations in testing short-distance fibers.
An OTDR is an instrument used to test optical fibers which works like an optical radar. It evaluates fiber optic link characteristics and measures fiber parameters such as attenuation, length, and loss. The document discusses OTDR operational principles, basic setup requirements including range, pulse width, and index of refraction. It also covers OTDR types, testing and trace analysis procedures, and limitations in testing short-distance fibers.
Detection of Underground Cable Fault using ArduinoIRJET Journal
This document describes a system to detect faults in underground cables using an Arduino. It uses Ohm's law - a voltage is applied to the cable and the current measured to determine faults. Resistors represent distances along the cable where fault switches can induce faults. When a fault occurs, the voltage change is read by the Arduino and the fault location displayed on an LCD in kilometers. The system can detect common fault types like line-ground and line-line faults. It is meant to more easily locate underground cable faults compared to traditional methods that require digging to find faults.
Nd at s best practices for single mode tier i ii testing 01-2011Dean Murray
The document discusses selecting and operating Optical Time Domain Reflectometers (OTDRs) for fiber optic cable testing. It compares OTDRs to Optical Loss Test Sets (OLTS) and describes how OTDRs can provide additional information about individual connections, splices and fiber sections compared to OLTS. It reviews different OTDR models from Noyes including the M200, M700, OFL280 and C850 and how to set them up and perform basic OTDR operations and testing.
Guide to Fiber Optic Jumper Cable SelectionJo Wang
Fiber optic jumper cables are available in OS1, OS2 single-mode and OM1, OM2, OM3, OM4 multimode types. Both ends of the optical cable are terminated with a high performance hybrid or single type fiber optic connector, such as SC connector, ST connector, FC connector, LC connector, MTRJ connector, or E2000 connector in simplex or duplex. There are so many kinds of fiber optic patch cables for various applications. How to choose right fiber optic patch cables for your networks? This post provides a selection guide for you.
Analysis on The Impact of Reflectance in Optical Fiber Linksijtsrd
An optical fiber link is a part of an optic fiber communication system. Other components of the optic fiber link include the transmitter, connectors, and the receiver. The optical fiber could be single-mode (for long distance transmission) or multi-mode (for short distance transmission). This paper however, majors on the impact of reflectance in the single-mode optical fiber. Reflectance is a hidden threat that increases Bit Error Rate, BER, (rate at which errors occur in transmission system) and reduces system performance if not monitored or controlled. Optical Time Domain Reflectometer (OTDR) was used to measure the reflectance in single-mode fiber. Events measurements in OTDR heavily depend on good reflectance. The OTDR was able to establish the reflectance in every portion of the fiber under test. An average reflectance level of -14.9275 dB of 1550 nm signal over the span length of 20.422 km was achieved which is within the acceptable standard range. Hence, good quality performance transmissions can be achieved along these routes. J. Ilouno | M. Awoji | J. Sani"Analysis on The Impact of Reflectance in Optical Fiber Links" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-2 | Issue-4 , June 2018, URL: http://www.ijtsrd.com/papers/ijtsrd14378.pdf http://www.ijtsrd.com/physics/other/14378/analysis-on-the-impact-of-reflectance-in-optical-fiber-links/j-ilouno
CHINA’S GEO-ECONOMIC OUTREACH IN CENTRAL ASIAN COUNTRIES AND FUTURE PROSPECTjpsjournal1
The rivalry between prominent international actors for dominance over Central Asia's hydrocarbon
reserves and the ancient silk trade route, along with China's diplomatic endeavours in the area, has been
referred to as the "New Great Game." This research centres on the power struggle, considering
geopolitical, geostrategic, and geoeconomic variables. Topics including trade, political hegemony, oil
politics, and conventional and nontraditional security are all explored and explained by the researcher.
Using Mackinder's Heartland, Spykman Rimland, and Hegemonic Stability theories, examines China's role
in Central Asia. This study adheres to the empirical epistemological method and has taken care of
objectivity. This study analyze primary and secondary research documents critically to elaborate role of
china’s geo economic outreach in central Asian countries and its future prospect. China is thriving in trade,
pipeline politics, and winning states, according to this study, thanks to important instruments like the
Shanghai Cooperation Organisation and the Belt and Road Economic Initiative. According to this study,
China is seeing significant success in commerce, pipeline politics, and gaining influence on other
governments. This success may be attributed to the effective utilisation of key tools such as the Shanghai
Cooperation Organisation and the Belt and Road Economic Initiative.
A SYSTEMATIC RISK ASSESSMENT APPROACH FOR SECURING THE SMART IRRIGATION SYSTEMSIJNSA Journal
The smart irrigation system represents an innovative approach to optimize water usage in agricultural and landscaping practices. The integration of cutting-edge technologies, including sensors, actuators, and data analysis, empowers this system to provide accurate monitoring and control of irrigation processes by leveraging real-time environmental conditions. The main objective of a smart irrigation system is to optimize water efficiency, minimize expenses, and foster the adoption of sustainable water management methods. This paper conducts a systematic risk assessment by exploring the key components/assets and their functionalities in the smart irrigation system. The crucial role of sensors in gathering data on soil moisture, weather patterns, and plant well-being is emphasized in this system. These sensors enable intelligent decision-making in irrigation scheduling and water distribution, leading to enhanced water efficiency and sustainable water management practices. Actuators enable automated control of irrigation devices, ensuring precise and targeted water delivery to plants. Additionally, the paper addresses the potential threat and vulnerabilities associated with smart irrigation systems. It discusses limitations of the system, such as power constraints and computational capabilities, and calculates the potential security risks. The paper suggests possible risk treatment methods for effective secure system operation. In conclusion, the paper emphasizes the significant benefits of implementing smart irrigation systems, including improved water conservation, increased crop yield, and reduced environmental impact. Additionally, based on the security analysis conducted, the paper recommends the implementation of countermeasures and security approaches to address vulnerabilities and ensure the integrity and reliability of the system. By incorporating these measures, smart irrigation technology can revolutionize water management practices in agriculture, promoting sustainability, resource efficiency, and safeguarding against potential security threats.
A review on techniques and modelling methodologies used for checking electrom...nooriasukmaningtyas
The proper function of the integrated circuit (IC) in an inhibiting electromagnetic environment has always been a serious concern throughout the decades of revolution in the world of electronics, from disjunct devices to today’s integrated circuit technology, where billions of transistors are combined on a single chip. The automotive industry and smart vehicles in particular, are confronting design issues such as being prone to electromagnetic interference (EMI). Electronic control devices calculate incorrect outputs because of EMI and sensors give misleading values which can prove fatal in case of automotives. In this paper, the authors have non exhaustively tried to review research work concerned with the investigation of EMI in ICs and prediction of this EMI using various modelling methodologies and measurement setups.
Redefining brain tumor segmentation: a cutting-edge convolutional neural netw...IJECEIAES
Medical image analysis has witnessed significant advancements with deep learning techniques. In the domain of brain tumor segmentation, the ability to
precisely delineate tumor boundaries from magnetic resonance imaging (MRI)
scans holds profound implications for diagnosis. This study presents an ensemble convolutional neural network (CNN) with transfer learning, integrating
the state-of-the-art Deeplabv3+ architecture with the ResNet18 backbone. The
model is rigorously trained and evaluated, exhibiting remarkable performance
metrics, including an impressive global accuracy of 99.286%, a high-class accuracy of 82.191%, a mean intersection over union (IoU) of 79.900%, a weighted
IoU of 98.620%, and a Boundary F1 (BF) score of 83.303%. Notably, a detailed comparative analysis with existing methods showcases the superiority of
our proposed model. These findings underscore the model’s competence in precise brain tumor localization, underscoring its potential to revolutionize medical
image analysis and enhance healthcare outcomes. This research paves the way
for future exploration and optimization of advanced CNN models in medical
imaging, emphasizing addressing false positives and resource efficiency.
Understanding Inductive Bias in Machine LearningSUTEJAS
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
Harnessing WebAssembly for Real-time Stateless Streaming PipelinesChristina Lin
Traditionally, dealing with real-time data pipelines has involved significant overhead, even for straightforward tasks like data transformation or masking. However, in this talk, we’ll venture into the dynamic realm of WebAssembly (WASM) and discover how it can revolutionize the creation of stateless streaming pipelines within a Kafka (Redpanda) broker. These pipelines are adept at managing low-latency, high-data-volume scenarios.
Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapte...University of Maribor
Slides from talk presenting:
Aleš Zamuda: Presentation of IEEE Slovenia CIS (Computational Intelligence Society) Chapter and Networking.
Presentation at IcETRAN 2024 session:
"Inter-Society Networking Panel GRSS/MTT-S/CIS
Panel Session: Promoting Connection and Cooperation"
IEEE Slovenia GRSS
IEEE Serbia and Montenegro MTT-S
IEEE Slovenia CIS
11TH INTERNATIONAL CONFERENCE ON ELECTRICAL, ELECTRONIC AND COMPUTING ENGINEERING
3-6 June 2024, Niš, Serbia
2. Table of Contents
Potential Causes
Visual Fault Locators
Light Source and Power Meter (LSPM) and Optical Loss Test Set (OLTS)
Optical Fault Finders
Advanced Troubleshooting with Optical Time Domain Reflectometers (OTDR)
Launch And Receive Cables and Compensation
Understanding OTDR Results
Advanced OTDR Settings - Pulsewidth
Wavelength
Thresholds and Averaging
Advanced Trace Analysis
Non-Reflective Events
Real Time Trace
Troubleshooting Fiber Jumpers
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3. Potential Causes
Problems within a fiber link can occur due to a wide variety of reasons. A very common problem is that a connector is not fully engaged - often hard to notice in
a crowded patch panel. Or it could be caused by the quality of the connector itself, such as poor end-face geometry that doesn’t pass the parameters defined by
IEC PAS 61755-3 standards, including angle of the polish, fiber height, radius of curvature or apex offset.
A more common cause is poor field termination that results in air gaps and high insertion loss or scratches, defects and contamination on the end face of the
connector. In fact, contamination remains the leading cause of fiber failures—dust, fingerprints and other oily substances cause excessive loss and sometimes
permanent damage to connector end faces.
The issue could also be caused by a faulty fusion splice, misalignment or incorrect polarity. Poor cable management can put strain on a connector that causes
misalignment, or the connector may not be properly seated and connected with its mate. Worn or damaged latching mechanisms on connectors or adapters are
sometimes the culprit. Within the link itself, the fiber may have experienced microbends or macrobends, or it could have been damaged with a break
somewhere along the length of the fiber.
The overall design of the cable plant can also be the cause of a fiber link experiencing insertion loss and performance issues. Even if all the connectors are high
quality, free of contamination and properly terminated, if there are too many connections in a channel, the loss may exceed specifications for a given
application. The same may occur from violation of distance limitations on multimode fiber, resulting in high modal dispersion.
Visual Fault Locators
The simplest troubleshooting tool is the Visual Fault Locator, or VFL. This inexpensive tool that should be found in virtually every fiber technician’s tool bag uses
a bright laser beam of light (typically red) that can be easily seen by the human eye, unlike the invisible infrared light used by active electronics within the
system. A VFL is ideal for testing continuity and polarity from one end of the link to the other and finding breaks in cables, connectors and splices. It is also a
great tracing tool for locating the other end of a single fiber terminated within a rack. Some field-terminated connectors also include a VFL window, which allows
for connecting the VFL to the connector immediately following termination to verify that the termination was done correctly—if the light from the VFL escapes
and appears in the connector’s VFL window, the two fiber end faces within the connector were not properly mated.
VFLs, such as Fluke Networks’ VisiFault™ VFL, that include both continuous and flashing modes can make for easier identification. VFLs that are compatible
with various connector types via simple changeable adapters means only one VFL is needed for testing 2.5mm connectors such as SC, ST, FC, and FJ
connectors and 1.25mm connectors such LC and MU connectors. A long battery life is also a key consideration, as well as overall rugged construction to
maintain reliability.
A VFL can also be used for locating breaks, macrobend losses caused by a kink in the fiber and bad splice points. The red visible light of a VFL is bright enough
to been seen through the fiber jacket at the break or macrobend location, especially in low light environments. This also makes the VFL useful for identifying bad
splices within splice enclosures.
While considered a lower-level troubleshooting tool compared to others, a VFL is also a good accompaniment to OTDRs because it can locate faults that are
too close together for an OTDR to properly isolate, as well as faults that are located too close to the OTDR within the “dead zone.” This can be especially helpful
for identifying bad splices when using splice-on pigtails since they are near the end of the link.
Light Source and Power Meter (LSPM) and Optical Loss Test Set (OLTS)
Primarily used for Tier 1 certification and acceptance testing and the most accurate tool for measuring loss, a light source and power meter (LSPM) or Optical
Loss Test Set (OLTS) can also be used for troubleshooting. By comparing the loss of the link to the requirements of the technology, you can determine whether
or not the fiber link is the source of a problem. They can also be used to verify, output power from a device such as a switch, as well as continuity, and polarity.
Use an LSPM or OLTS to reveal if the loss is on a single fiber or on all the fibers in a cable. If there is loss on all fibers in the cable, this is a good indication that
the cable is damaged or kinked. If there is loss on a single fiber, the problem is more likely associated with a bad splice or connector. It is important to note that
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4. neither an LSPM or OLTS will identify or locate specific loss events within the link. That’s where fault finders and OTDRs come in.
Optical Fault Finders
While VFLs work well for exposed lengths of fiber by illuminating bad connections and breaks, they are not very helpful for long cable runs, when the cable is
not visible or accessible, or when the laser light can’t penetrate the jacket. Optical Time Domain Reflectometers (OTDR) provide graphical data and analysis
along the entire length of a cable, but they can be expensive and require more time and skill to operate. When it comes to troubleshooting, optical fault finders
fill the gap between a VFL and an OTDR.
Optical fault finders such as Fluke Networks’ Fiber QuickMap quickly and efficiently measure length and identify high loss events and breaks on multimode up to
1,500 meters (4,921 feet). Very simple to use, this single-ended optical fault finder uses technology similar to an OTDR, sending a laser light pulse through the
fiber and measuring the power and timing of light reflected from high loss connections and splices, and from the end of the fiber. They are ideal for measuring
high-loss splices, connections and breaks in a fiber link, as well as the overall length of the link. The QuickMap also detects live optical signals before testing.
Being able to measure the length of the fiber quickly makes this a very useful tool. If you're testing a 3 kilometer fiber and the tool reports a length of 1.2 km,
then you know it's broken. It's also extremely handy for finding MPO connections where both are unintentionally unpinned - this is a common problem which will
result in a complete connection failure. This problem can be especially hard to find in patch panels where you can't easily or safely stare into the port to see if
the pin is there or not.
These units are simple to operate. After cleaning the connections, a launch fiber is attached to the tester. Using a launch and tail fiber allow the testers to find
incidents near or at the ends of the link. The user then presses TEST, and in a few seconds, the unit displays the number of incidents detected along the fiber
link. Incidents include connectors, splices, and the end of the link. Incidents are defined as events that exceed a programmable limit for loss or reflectance. The
user can scroll through each incident and view the distance and amount of loss of each. See figure 3 for an example.
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5. Figure 3. Optical Fault Finders identify the distance to reflective incidents along the length of the fiber link.
Advanced Troubleshooting with Optical Time Domain Reflectometers (OTDR)
While you may be able to pinpoint a problem with a VFL or optical fault finder, sometimes you simply need to know more. An Optical Time Domain
Reflectometer (OTDR) calculates signal loss based on the amount of reflected light, or backscatter, that it detects. Using this technology, an OTDR can be used
for locating fiber breaks, bends, splices and connectors and for measuring the loss of these specific events. Access to this level of detail with an OTDR arms
you with a complete picture of the fiber installation and the overall quality of the workmanship. OTDRs are more expensive than VFLs, an LSPM/OLTS and
optical fault finders, and they require some expertise, but because they measure the location, loss and characteristics of individual events, they are considered
the ultimate troubleshooting tool.
An OTDR is the optical equivalent of an electronic time domain reflectometer. It injects a series of optical pulses into the fiber under test and extracts, from the
same end of the fiber, light that is scattered (Rayleigh backscatter) or reflected back from points along the fiber. The scattered or reflected light that is gathered
back is used to characterize the optical fiber. This is equivalent to the way that an electronic time-domain meter measures reflections caused by changes in the
impedance of the cable under test. The strength of the return pulse is measured and integrated as a function of time, and plotted as a function of fiber length.
The Scatter Line, or Trace is used to infer loss based on drops in the strength of the Raleigh Backscatter signal. If Rayleigh Backscatter did not occur, then an
OTDR would never have been designed. Rayleigh Scatter occurs in all fiber optic cables. Not all of the light energy can be absorbed by the glass molecules in
the core of the fiber optic cable, so this unabsorbed light scatters in all directions. Only a tiny fraction of the light injected into a fiber is reflected back to the
OTDR. This is the Backscatter (sometimes called Scatter) Line.
When light traveling through a fiber optic cable encounters a different density material such as air, up to 8% of the light is reflected back to the source, while the
rest continues out into the new material. This is called Fresnel Reflection and shows where the connections are. By comparing the trace line before and after the
connector, the loss and reflectance from the connector can be inferred.
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6. Launch And Receive Cables and Compensation
Light scattered back to the OTDR for measurement is a tiny fraction of what is in the test pulse. Therefore, the OTDR receiver circuit has to be very sensitive.
The connector in the OTDR generates a large reflection that saturates the OTDR receiver. It takes some time for the sensor to recover from this large reflection
– much like your eyes need time to recover after a bright flash. Time equals distance, so by adding a launch cable between the OTDR and the first connector,
the sensor has enough time to recover and be ready to see the reflection from the first connector in the link. The length of the launch fiber needs to long enough
to support the maximum pulse widths needed for testing the lengths of fiber. With an adequate launch fiber (typically 100m or more), there is a scatter line in
front of the first event, and scatter line afterwards, allowing the first connection to be measured.
When the light pulse hits the last connection in the link, a large reflection occurs because of the glass-to-air transition of the light. Since there is no more fiber at
the end of the connection, there is no more backscatter and the measurement drops to the noise floor of the OTDR sensor. Using a Receive cable (sometimes
called a tail cable) extends the backscatter, so there is backscatter before and after the last event. This allows the technician to measure and include the loss of
the last connection in their test.
Figure 4. Without a receive or "tail" cable, the performance of the last connector cannot be observed.
Figure 5. Adding a launch and receive fibers at the far end of the cable allow the OTDR to measure the loss of the first and last connectors in the link.
Technicians and persons accepting the test results do not want the measurement of the Launch and Receive cables to be included in their reports, however.
OTDR’s let you compensate (in effect, remove) the launch and receive cables, so all that is reported are the results from the link under test.
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7. Figure 6. The trace includes the launch and receive fibers at the beginning and end of the link under test. The EventMap shown at right uses launch
compensation to remove their effects from the test results.
Understanding OTDR Results
When you troubleshoot with an OTDR, you end up with a graphical signature of a fiber's loss along its length. While an OTDR trace can seem a bit
overwhelming, it tells a story about the fiber link it tests with each dip or spike revealing the type of event.
Figure 7. An OTDR trace result.
Experienced OTDR users will recognize reflective events for tester connectors, launch cords, connectors, mechanical splices, fusion splices, mis-matched fibers
and the end of the link. And they will know that the little blips they see after the end of the link are ghosts, which are not real events to be concerned with.
But if you’re not a trace analysis expert, don’t worry. The OptiFiber® Pro also uses advanced logic to interpret the trace and provide an EventMap™ that
characterizes the actual events. And faulty events are highlighted with red icons so you can locate your problem even faster.
Accessible via a help icon in the bottom left of the EventMap, OptiFiber Pro even suggests corrective actions for resolving any problems.
When troubleshooting a link with multiple questionable events, a good rule of thumb is to address the events nearest to the OTDR first. Once these are cleared
up, the OTDR will have better visibility into the events further downstream.
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8. Figure 8. EventMap view with on-screen help
Modern OTDR’s automate many of the functions of the OTDR to make it easy for almost anyone to perform analysis like an expert. However, there are some
instances where more expertise can be used to further analyze the fiber and find out more. The next two sections will discuss advanced OTDR settings and
trace analysis.
Advanced OTDR Settings - Pulsewidth
Adjusting the pulsewidth allows the operator to trade the ability to measure on longer fibers against the ability to identify discrete events on the fiber. To ensure
backscatter is returned to the OTDR from long distances, the tester has to put more energy into the cable by turning the light on for a longer period of time -
increasing the pulse width. However, the longer the pulse width the larger the deadzone – the minimum distance between events that the OTDR can discern.
Since light in a fiber travels at about 0.2 meters per nanosecond, a narrow 3 ns pulse would not be able to “see” two events that are less than 0.6 meters apart.
A wide 1000ns pulse would be able to see two separate events only if they were more than 200 meters apart.
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9. Figure 9. A narrower input pulse is able to discern events that are closer together.
Wavelength
Testing at multiple wavelengths should always be performed as it is the best way to ensure that you'll find bends or cracks in the fiber. Even if the application will
only use the lower wavelength for transmission, when troubleshooting with your OTDR, it's best to test at both 850 and 1300nm for mutimode and 1300 and
1550 for singlemode. Normally, the higher wavelength would show a lower loss, but if the fiber is stressed, the higher wavelength will show significantly higer
loss, and the problem will be easier to detect. Note that the wavelengths are "bound", meaning that the wavelengths noted above are sufficient for testing even if
other wavelengths will be used in operation. If the problem is located at a splice-on pigtail, you may need a VFL to determine if the problem is a cracked or
kinked fiber rather than the pigtail connector as the event on the trace will typically show up at about the distance to the connector. OptiFiber Pro features a
handy built-in VFL for just this sort of situation.
Thresholds and Averaging
There may also be troubleshooting instances where the OTDR settings need to be manually adjusted. For example, when properly executed, a splice can
exhibit a loss of less than< 0.1dB. If you need to locate a splice, and it has a very low loss, it may not show up on the OTDR if the loss threshold is set higher
than the loss of the splice. Fluke Network's OptiFiber Pro Auto setting for Loss Threshold is 0.15dB, which means it will only find events at or above this level.
The Loss Threshold can be manually set lower to locate extremely low-loss splices.
Note that smaller threshold values mean that the tester takes more measurements or uses wider pulse widths, which may increase test times or dead zones on
the trace. A Loss Threshold of less than 0.15dB may also cause an OTDR to find false events due to inherent imperfections in the fiber. Changing the Averaging
Time can also help locate fusion splices. Averaging Time sets the number of measurements averaged together to create the final trace - longer times reduce
noise to reveal more details like non-reflective splice events. When troubleshooting long links, the dynamic range on the OTDR may need to be increased to
measure to the end of the fiber, which also means wider pulse widths, resulting in increased test times and dead zones.
Advanced Trace Analysis
Traces show a slight downward trendline as they move away from the launch, which indicates the decreasing backscatter resulting from loss over the length of
the cable. Connectors show up on the trace with a characteristic “spike” resulting from the reflection, followed by a drop from the trendline which indicates the
loss (attenuation) attributed to the connector.
Figure 10. The drop in the trendline indicates the loss of the connector.
Non-Reflective Events
Non-reflective events are indicated by a drop in the strength of the backscatter signal without the “spike” shown from connectors. “Hidden” events are one
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10. example, caused by two connectors close enough to each other to be within the event dead zone of the OTDR.
Another example are “ghosts” - caused by a return from a highly reflective connection that results in a reflected signal that bounces back and forth between
connections. Most ghost events will display as reflective events beyond the end of the fiber. However, some may show up in the trace. These ghost events can
be identified because they are reflective events with no loss. The OptiFiber Pro detects ghosts, and then identifies the source, making it easy to fix the root
cause.
Figure 11. “Ghosts" are non-existent events resulting from strong reflected signals from actual events.
Real Time Trace
Real Time Trace is a continuously updated display of the fiber’s backscatter trace line. This feature can be used to test fiber on the spool to ensure there was no
damage from shipping. This is done before pulling, or burying the fiber. Another use is the “Wiggle Test” – when loose connections, or damaged connectors are
suspected, a technician uses real time trace while wiggling the connector, or pushing in on the connector to see if the connection recovers, or is permanently
broken.
Troubleshooting Fiber Jumpers
Fiber jumpers are an integral part of any fiber network—whether used to make connections between fiber patching areas and switches in the data center or out
in the LAN to connect end devices in a fiber-to-the-desk application.
Unfortunately, fiber jumpers are also typically the weakest link in the network. They are handled and manipulated more than any other component, which makes
them more subject to damage. They are also often considered a commodity item and some end users will seek to save money by purchasing them from lesser-
known generic sources that may skimp on quality and compliance.
After permanent link testing, which doesn’t include the fiber jumpers and is considered best practice for new installations, subsequent channel testing might
identify problems. Troubleshooting of individual jumpers can be done using an optical loss test set (OLTS) like Fluke Networks’ CertiFiber Pro. This is achieved
using the one-jumper reference method to set the reference and an adapter to connect the jumper to the test reference cord. With the other end of the jumper
connected to the remote unit, only the loss of the connection between the reference cable and jumper is tested. Simply reversing the jumper tests the connector
on the other end of the jumper.
About Fluke Networks
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