The attached narrated power point presentation explains the working principle of Thulium Doped Fiber Amplifiers based on their energy level diagrams. The material also attempts to explain the different types, advantages, disadvantages and applications of Thulium Doped Fiber Amplifiers, apart from comparison between different optical amplifier types. The material will be of interest to KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
The attached narrated power point presentation attempts to explain the methods of computation of total power loss and system rise time in a fiber optic link. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
This narrated power point presentation attempts to examine the losses due to non-linear effects in optical fibers. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
The attached narrated power point presentation attempts to explain the methods of computation of total power loss and system rise time in a fiber optic link. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
This narrated power point presentation attempts to examine the losses due to non-linear effects in optical fibers. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
A horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam. Horns are widely used as antennas at UHF and microwave frequencies, above 300 MHz.
The attached narrated power point presentation attempts to explain the working principle, types, classifications, merits, demerits, applications,safety and deployment issues related to Raman Amplifiers. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
Basics of Optical amp, a brief explanation on how a Raman OP works.
You must know What is Scattering, stimulated and spontaneous emission in order to understand the basic principal of this OP amp.
Pump is also important which is the one that stimulates the energy to higher levels.
LEDs are of interest for fibre optics because of five inherent characteristics..
How it works?
Spectrum of an LED
Modulation of LED
LED Vs. Laser diode
disadvantages of LED
The attached narrated power point presentation describes the principle of working, various configurations, advantages, disadvantages and applications of Erbium Doped Fiber Amplifiers. The material will be useful to KTU final year B tech students who prepare for the subject EC 405, Optical Communications.
The aperture is defined as the area, oriented perpendicular to the direction of an incoming radio wave, which would intercept the same amount of power from that wave as is produced by the antenna receiving it. A horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam. Horns are widely used as antennas at UHF and microwave frequencies, above 300 MHz.
Optical fiber communication Part 2 Sources and DetectorsMadhumita Tamhane
For optical fiber communication, major light sources are hetero-junction-structured semiconductor laser diode and light emitting diodes. Heterojunction consists of two adjoining semiconductor materials with different bandgap energies. They have adequate power for wide range of applications. Detectors used are PiN diode and Avalanche Photodiode. Being very small in size and feeding to small core optical fiber, it is very important to study emission characteristics of sources and their coupling to fiber. As it can operate for low power over a long distance, received power is very small, hence study of noise characteristics of detectors is very essential...
The attached narrated power point presentation attempts to explore the various semiconductor injection laser diode structures. The material will be useful for KTU final year B tech students who prepare for the subject EC 405, Optical Communications.
The attached narrated power point presentation offers a mathematical treatment of parameters of an LED such as output power and efficiency. A few worked out examples can also be found.
A horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam. Horns are widely used as antennas at UHF and microwave frequencies, above 300 MHz.
The attached narrated power point presentation attempts to explain the working principle, types, classifications, merits, demerits, applications,safety and deployment issues related to Raman Amplifiers. The material will be useful for KTU final year B Tech students who prepare for the subject EC 405, Optical Communications.
Basics of Optical amp, a brief explanation on how a Raman OP works.
You must know What is Scattering, stimulated and spontaneous emission in order to understand the basic principal of this OP amp.
Pump is also important which is the one that stimulates the energy to higher levels.
LEDs are of interest for fibre optics because of five inherent characteristics..
How it works?
Spectrum of an LED
Modulation of LED
LED Vs. Laser diode
disadvantages of LED
The attached narrated power point presentation describes the principle of working, various configurations, advantages, disadvantages and applications of Erbium Doped Fiber Amplifiers. The material will be useful to KTU final year B tech students who prepare for the subject EC 405, Optical Communications.
The aperture is defined as the area, oriented perpendicular to the direction of an incoming radio wave, which would intercept the same amount of power from that wave as is produced by the antenna receiving it. A horn antenna or microwave horn is an antenna that consists of a flaring metal waveguide shaped like a horn to direct radio waves in a beam. Horns are widely used as antennas at UHF and microwave frequencies, above 300 MHz.
Optical fiber communication Part 2 Sources and DetectorsMadhumita Tamhane
For optical fiber communication, major light sources are hetero-junction-structured semiconductor laser diode and light emitting diodes. Heterojunction consists of two adjoining semiconductor materials with different bandgap energies. They have adequate power for wide range of applications. Detectors used are PiN diode and Avalanche Photodiode. Being very small in size and feeding to small core optical fiber, it is very important to study emission characteristics of sources and their coupling to fiber. As it can operate for low power over a long distance, received power is very small, hence study of noise characteristics of detectors is very essential...
The attached narrated power point presentation attempts to explore the various semiconductor injection laser diode structures. The material will be useful for KTU final year B tech students who prepare for the subject EC 405, Optical Communications.
The attached narrated power point presentation offers a mathematical treatment of parameters of an LED such as output power and efficiency. A few worked out examples can also be found.
International Journal of Engineering Research and Applications (IJERA) is an open access online peer reviewed international journal that publishes research and review articles in the fields of Computer Science, Neural Networks, Electrical Engineering, Software Engineering, Information Technology, Mechanical Engineering, Chemical Engineering, Plastic Engineering, Food Technology, Textile Engineering, Nano Technology & science, Power Electronics, Electronics & Communication Engineering, Computational mathematics, Image processing, Civil Engineering, Structural Engineering, Environmental Engineering, VLSI Testing & Low Power VLSI Design etc.
In this paper, we utilized optimized C-band and L-band amplifiers to constitute a broadband CA-L erbium-doped amplifier with a parallel structure. This amplifier has a simple configuration, high-flattened gain and low noise. Meanwhile, we have realized an amplification bandwidth of over 70 nm(1 524—1 602 nm)without any broadband gain flattening component. The C-band average gain is over 30 dB and L-band gain variation is less than 2 dB.
The attached narrated power point presentation explores the electromagnetic spectrum classification, attempts to explain the need for modulation and process of analog modulation. The material will be useful for KTU first year students who prepare for the subject EST 130, Part B, Basic Electronics Engineering.
EST 130, Transistor Biasing and Amplification.CKSunith1
The attached narrated power point presentation explains the need for biasing in transistor amplifiers and the different biasing arrangements used in transistor circuits. The material will be useful for KTU first year B Tech students who prepare for the subject EST 130, Part B, Basic Electronics Engineering.
EST 200, Design Thinking in Automobile IndustryCKSunith1
The attached narrated power point presentation attempts a case study exploration of how automobile industry has benefited through the implementation of design thinking and innovation. The material will be useful for KTU second year B Tech students who prepare for the subject EST 200, Design and Engineering.
The attached narrated power point presentation explains the construction, working and applications of bipolar junction transistors. The material will benefit KTU first year B Tech students who prepare for the subject EST 130, Part B, Basic Electronics Engineering.
The attached narrated power point presentation reviews the construction, working and applications of shift registers built using D Flipflops. The material will be useful for KTU second year students who prepare for the subject CSL 202, Digital Laboratory.
The attached narrated power point presentation explains the construction, working and applications of PN Junction Diodes. The material will be useful for KTU first year students who prepare for the subject EST 130, Part B, Basic Electronics Engineering.
The attached narrated power point presentation explains the methods of oral and written communication which the design engineers use to communicate with the clients or the audience. The material will be useful for KTU second year B Tech students who prepare for the subject EST 200, Design and Engineering.
The attached narrated power point presentation reviews the construction, working and timing diagrams of ring and johnson counters as well as asynchronous and synchronous up, down, up/down and decade counters using popular flipflop ICs. The material will be useful for KTU B Tech second year students who prepare for the subject CSL 202, Digital Laboratory.
EST 200, Designing Triggers for Behavior ChangeCKSunith1
The attached narrated power point presentation mentions Shikakaeology,the Japanese method for behavioral change. The material will be useful for those who aspire to become design engineers.
EST 200, Communicating Designs GraphicallyCKSunith1
The attached narrated power point presentation mentions the methods adopted by design engineers to communicate their designs. The material focuses on graphical methods of design communication. The material will be useful for KTU second year B Tech students who prepare for the subject EST 200, Design and Engineeirng.
The attached narrated power point presentation mentions the different materials used for the construction of semiconductors. It offers structural and energy level explanation on the properties exhibited by the semiconductor materials. It also throws light on the structure and behaviour of a PN junction and use of PN junctions in active electronic components. The material will be useful for KTU first year students who prepare for the subject EST 130, Part B, Basic Electronics Engineering.
The attached narrated power point presentation explores the merits and limitations of team work in design thinking. The material will be useful for KTU second year B Tech students who prepare for the subject EST 200, Design and Engineering.
EST 200, Design Thinking in a Work Place.CKSunith1
The attached narrated power point stresses the need for introducing design thinking practices in a work place. The material will be useful for KTU second year B Tech students who prepare for the subject EST 200, Design and Engineering.
The attached narrated power point presentation explains the construction and working of RS, D, JK, T and JK Master Slave Flipflops using Logic Gates. The material will be useful to KTU second year B Tech Computer Science and Engineering students who prepare for the subject CSL 202, Digital Laboratory.
EST 200, Convergent and Divergent ThinkingCKSunith1
The attached narrated power point presentation explores the various aspects and activities in divergent and convergent thinking and the necessity of divergent and convergent thinking in the design thinking process. The material will be useful for KTU second year B Tech students who prepare for the subject EST 200, Design and Engineering.
The attached narrated power point presentation explores the implementation and benefits of design thinking at a work place. A few case studies are also included. The material will be useful for KTU second year B Tech students who prepare for the subject EST 200, Design and Engineering.
The attached narrated power point presentation explains the principles process and frame work of design thinking. The material also mentions a few applications of design thinking. The material will be useful for KTU second year students who prepare for the subject EST 200, Design and Engineering.
The attached narrated power point presentation discusses the different types of active components used in electronics engineering and the methods to identify active electronic components. The material will be useful for KTU first year B Tech students who prepare for the subject EST 130, Part B, Basic Electronics Engineering.
The attached narrated power point presentation explains the working of multiplexers and demultiplexers and familiarises oneself with popular multiplexer, demultiplexer and decoder ICs. The material will be useful for KTU second year B Tech students in Computer Science and Engineering who prepare for the subject CSL 202, Digital Laboratory.
The attached narrated power point (with audio) presentation mentions the constructional features, different types of inductors, their ratings, methods for testing and precautions for handling. The material will be useful for KTU first year B Tech students who prepare for the subject EST 130, Part B, Basic Electronics Engineering.
Accelerate your Kubernetes clusters with Varnish CachingThijs Feryn
A presentation about the usage and availability of Varnish on Kubernetes. This talk explores the capabilities of Varnish caching and shows how to use the Varnish Helm chart to deploy it to Kubernetes.
This presentation was delivered at K8SUG Singapore. See https://feryn.eu/presentations/accelerate-your-kubernetes-clusters-with-varnish-caching-k8sug-singapore-28-2024 for more details.
Securing your Kubernetes cluster_ a step-by-step guide to success !KatiaHIMEUR1
Today, after several years of existence, an extremely active community and an ultra-dynamic ecosystem, Kubernetes has established itself as the de facto standard in container orchestration. Thanks to a wide range of managed services, it has never been so easy to set up a ready-to-use Kubernetes cluster.
However, this ease of use means that the subject of security in Kubernetes is often left for later, or even neglected. This exposes companies to significant risks.
In this talk, I'll show you step-by-step how to secure your Kubernetes cluster for greater peace of mind and reliability.
The Art of the Pitch: WordPress Relationships and SalesLaura Byrne
Clients don’t know what they don’t know. What web solutions are right for them? How does WordPress come into the picture? How do you make sure you understand scope and timeline? What do you do if sometime changes?
All these questions and more will be explored as we talk about matching clients’ needs with what your agency offers without pulling teeth or pulling your hair out. Practical tips, and strategies for successful relationship building that leads to closing the deal.
Transcript: Selling digital books in 2024: Insights from industry leaders - T...BookNet Canada
The publishing industry has been selling digital audiobooks and ebooks for over a decade and has found its groove. What’s changed? What has stayed the same? Where do we go from here? Join a group of leading sales peers from across the industry for a conversation about the lessons learned since the popularization of digital books, best practices, digital book supply chain management, and more.
Link to video recording: https://bnctechforum.ca/sessions/selling-digital-books-in-2024-insights-from-industry-leaders/
Presented by BookNet Canada on May 28, 2024, with support from the Department of Canadian Heritage.
Software Delivery At the Speed of AI: Inflectra Invests In AI-Powered QualityInflectra
In this insightful webinar, Inflectra explores how artificial intelligence (AI) is transforming software development and testing. Discover how AI-powered tools are revolutionizing every stage of the software development lifecycle (SDLC), from design and prototyping to testing, deployment, and monitoring.
Learn about:
• The Future of Testing: How AI is shifting testing towards verification, analysis, and higher-level skills, while reducing repetitive tasks.
• Test Automation: How AI-powered test case generation, optimization, and self-healing tests are making testing more efficient and effective.
• Visual Testing: Explore the emerging capabilities of AI in visual testing and how it's set to revolutionize UI verification.
• Inflectra's AI Solutions: See demonstrations of Inflectra's cutting-edge AI tools like the ChatGPT plugin and Azure Open AI platform, designed to streamline your testing process.
Whether you're a developer, tester, or QA professional, this webinar will give you valuable insights into how AI is shaping the future of software delivery.
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Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
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Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
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The latest edition of the OT/ICS and IoT security Threat Landscape Report 2024 also covers:
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Sectoral targets and attacks as well as the cost of ransom
Global APT activity, AI usage, actor and tactic profiles, and implications
Rise in volumes of AI-powered cyberattacks
Major cyber events in 2024
Malware and malicious payload trends
Cyberattack types and targets
Vulnerability exploit attempts on CVEs
Attacks on counties – USA
Expansion of bot farms – how, where, and why
In-depth analysis of the cyber threat landscape across North America, South America, Europe, APAC, and the Middle East
Why are attacks on smart factories rising?
Cyber risk predictions
Axis of attacks – Europe
Systemic attacks in the Middle East
Download the full report from here:
https://sectrio.com/resources/ot-threat-landscape-reports/sectrio-releases-ot-ics-and-iot-security-threat-landscape-report-2024/
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Keynote at DIGIT West Expo, Glasgow on 29 May 2024.
Cheryl Hung, ochery.com
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Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
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7. 7
Thulium Doped Fiber Amplifiers
• Thulium-doped fiber amplifier (TDFA)
provides high-power optical amplification in
S+ (1450–1480 nm) and S-bands (1480–1530
nm).
• TDFA to complement C- (1530–1560 nm) and
L-band (1560–1580 nm) amplification based
on EDFAs in high-capacity dense wavelength
division multiplexed (DWDM) systems.
• TDFA length and pump power determine
achievable gain and noise figure.
8. 8
Thulium Doped Fiber Amplifiers
• Additional bandwidth, modularity, inherent
higher pumping efficiency, and lower
nonlinear signal degradation compared
with alternatives such as S-band Raman
amplification.
• Light amplification in the Near Infra-Red
(NIR).
• Applications like coarse wavelength
division multiplexing (CWDM) and fiber to
the home (FTTH).
9. 9
Thulium Doped Fiber Amplifiers
(TDFA)
• Broad emission centered at 1.47 μm.
• Amplification in 1460 nm band based on
four level transition from 3H4 to 3F4 level.
• Spectral range covers the S-band.
• Used in S-band optical communications.
10. 10
Energy Level Diagram of Tm3+
• 4 Level Transition from 3H4 to 3F4 levels.
GSA – Ground State Absorption.
ESA – Excited State Absorption.
17. 17
TDFA Amplification 1.4 μm Pump
• Self terminating – limited amplification,
lifetime of 3H4 level (1.23 ms) shorter than
that of 3F4 lower level (10.8 ms).
• Difficult to create population inversion
between 3H4 and 3F4 levels using only one
pump wavelength.
• Lower level to be depopulated, auxiliary
pump needed.
18. 18
TDFA Amplification
• Main pump wavelengths are 800, 1050
and 1400 nm.
• Additional 1050 and 1400 nm laser diodes
used as auxiliary pump source.
• Main pump wavelength absorbed by
thulium ions through ground state
absorption (GSA).
• Population inversion achieved through
excited state absorption (ESA).
19. 19
TDFA Amplification
• Amplification through stimulated emission.
• Amplified spontaneous emission acts as
amplifier main noise source.
• Non-radiative losses caused by interaction
with phonons.
• Use of low phonon energy fluoride glasses as
host material for thulium ions.
• Ensure longer lifetime of higher amplification
level, reduce non-radiative energy transfer.
21. 21
TDFA Amplification 1.05 μm Pump
• High-power amplification than 1.4 μm
pumping.
• Yb - doped fiber lasers available at 1.05 μm
range.
• Larger the energy difference between the
pump and the signal.
- Excess heat.
- Heat radiation due to multiphonon
relaxation, no photon emission.)
- Lower Efficiency.
22. 22
Choice of Host Glass
• Silica glass – poor emission efficiency due
to large phonon energy.
• Silica glass - Tm3+ ion excited at the 3H4
level rapidly relaxes to 3H5 level by
multiphonon relaxation, no photon
emission.
• Fluoride fiber or tellurite fiber – low phonon
energy, efficient amplification in S-band.
24. 24
Bidirectional Single-Colour Pumped
TDFA
• Two pump diodes emit 1056 nm pumping
radiation.
• Pump radiation combined with signal using
the left WDM coupler, then both photon flows
travel through thulium doped fluorozirconate
fiber, amplification occurs.
• Second WDM coupler used to incorporate
pumping photon flow from the counter-
propagating direction.
• Amplified signal measured with an optical
spectrum analyzer.
26. 26
Properties of SiO2 and ZBLAN
Glasses
• Connection between thulium doped fiber
and standard fiber difficult.
• Difference in optical, mechanical and
thermal properties.
• Glueing technique to connect both fibers
due to processing temperature difference.
• Difference in refractive indices, angle
cleaved fibers to avoid reflections to the
fiber core on the connection interface.
27. 27
TDFA Spectra
• To avoid laser
oscillation for
higher
amplification,
ensure connection
between SiO2 and
ZBLAN fiber with
lower losses and
lower reflection.
Fiber: 5000ppm Tm3+ NA=0.16, length 1.9 m
29. 29
Bidirectional Double-Colour
Pumped TDFA
• Second pump source used, 790 nm pumping
power using Ti:Saphire laser pumped by
argon-ion-laser, connected with amplifier
using a special 790/1470 nm WDM coupler.
• Resonant ground state absorption to upper
amplification level using 790 nm pump.
• Population inversion between 3H4 and 3F4
can be varied, influences amplification profile.
• Low pump power at 790 nm from just one
side, only very small gain shift observed.
30. 30
Bidirectional Double-Colour
Pumped TDFA
• Careful design for WDM couplers
(1050/1470 nm) for small losses and a
proper coupling ratio for all three
wavelengths.
• If 1050/1470 WDM couplers not optimized
for 790 nm, relatively large losses at this
wavelength.
• To shift gain spectrum more towards longer
wavelengths apply more pump power at
790 nm, carefully control population
inversion along the active fiber.
31. 31
Gain Spectrum - Bidirectional
Double-Colour Pumped TDFA
Gain Shifted TDFA
32. 32
Device Merits Demerits [2]
EDFA High Power Efficiency
( >50%)
Less Wavelength
Range (1500 – 1600
nm), Amplified
Spontaneous Emission
Raman Amplifier GBW pump dependent Low Gain ( 20 – 25 dB)
Semiconductor
Optical Amplifier
Compact, Output
Saturation Power (5 –
10 dBm)
High Noise Factor (~ 8
dBm), High Coupling
Losses
YDFA High Output Power Incompatibility with
other types
EYCDFA
(co-doped)
High and flat gain (30 –
34 dB)
High Noise Factor (~ 10
dB)
TDFA Low Fiber Loss, Low
Noise
Amplified Spontaneous
Emission
34. 34
References
• Your Standard Text Books.
• M. M. Kozak, R. Caspary & W. Kowalsky,
“Thulium-doped Fiber Amplifier for the S-
Band” Conference Paper, July 2004.
• Prince Jain & Neena Gupta, ”Comparative
Study of all Optical Amplifiers”,
International Journal of Scientific and
Engineering Research, Volume 5, Issue
11, November 2014, ISSN 2229-5518.