This document provides an overview of wavelength division multiplexing (WDM) technologies, specifically comparing coarse WDM (CWDM) and dense WDM (DWDM). It discusses the characteristics of fiber cables and dispersion effects. CWDM uses lower density 20nm channel spacing, while DWDM uses denser 1.6nm spacing. CWDM is better for shorter distances and lower costs, while DWDM enables maximum capacity and long distances using erbium-doped fiber amplifiers. The document examines applications of each technology and potential future developments in increasing capacities.
Over view of Transmission Technologies & Optical Fiber Communication Naveen Jakhar, I.T.S
Topics covered in this presentation:
GENERAL: History of Transmission Systems
Optical fiber communication,
History of OFC
Advantages
Applications
ITU-T Recommendations
Fiber optic principle
Windows of operation
Trends in OF Communication
Fiber classification
OF Cable Types
Optical Fiber transmission impairments
Optical Sources and Detectors
Optical Link Characterization and Design
Optical Amplifiers are devices that amplify the optical light directly without conversion into electrical signals.
There are many types of Optical amplifier, but I am going to introduce to you the Semiconductor Optical Amplifier (SOA).
Over view of Transmission Technologies & Optical Fiber Communication Naveen Jakhar, I.T.S
Topics covered in this presentation:
GENERAL: History of Transmission Systems
Optical fiber communication,
History of OFC
Advantages
Applications
ITU-T Recommendations
Fiber optic principle
Windows of operation
Trends in OF Communication
Fiber classification
OF Cable Types
Optical Fiber transmission impairments
Optical Sources and Detectors
Optical Link Characterization and Design
Optical Amplifiers are devices that amplify the optical light directly without conversion into electrical signals.
There are many types of Optical amplifier, but I am going to introduce to you the Semiconductor Optical Amplifier (SOA).
Course Wave Division Multiplexing (CWDM): TechNet Augusta 2015AFCEA International
August 24, 2015
Dennis Troxel
Transition Networks
This Technology overview outlines the technology of Course Wave Division Multiplexing including real world government application examples to demonstrate the value of:
A) Overcoming Fiber Exhaustion
B) Increasing Fiber Bandwidth capacity
C) Providing Multiple Services over existing Fiber Pairs
Bandwidth is Becoming Commodity :
Price per bit went down by 99% in the last 5 years on the optical side
This is one of the problems of the current telecom market
Optical Metro – cheap high bandwidth access
$1000 a month for 100FX (in major cities)
This is less than the cost of T1 several years ago
Optical Long-Haul and Metro access - change of the price point
Reasonable price drive more users (non residential)
you can be friend with me on orkut
"mangalforyou@gmail.com" : i belive in sharing the knowledge so please send project reports ,seminar and ppt. to me .
This slide deck presents a user case by Microsoft (Mark Filer) for a 100G DWDM alternative to Coherent systems <80km using the PAM-4 approach. Fujitsu (Muhammed Sarwar) and Finisar (Gert Sarlet) present the case for Coherent. Inphi (Radha Nagarajan) and ADVA (Joerg-Peter Elbers) present the case for the PAM-4 approach. IEEE (John D'Ambrosia) weighs in from the standards perspective.
How to use WDM technology to expand fiber capacity.pdfHYC Co., Ltd
An article introduces all about WDM technology, including how does WDM work, what's mux and demux, cwdm vs dwdm, what does optical add-drop multiplexer stand for, wdm bands, wdm technology, wdm applications. How to use WDM technology to expand fiber capacity?
Technology Manager Andreas Roessler covers 5G basics in this keynote presentation at the RF Lumination 2019 conference in February 2019.
RF Lumination 2019
"Meet 158+ years of RF design & test expertise at one event. If they can't answer your question, it must be a really good question!"
Watch all the presentations here:
https://www.rohde-schwarz-usa.com/RFLuminationContent.html
Andreas Roessler is the Rohde & Schwarz Technology Manager focused on UMTS Long Term Evolution (LTE) and LTE-Advanced. With responsibility for the strategic marketing and product portfolio development for LTE/LTE-Advanced, Andreas follows the standardization process in 3GPP very closely, particularly on core specifications as well as protocol conformance, RRM and RF conformance specifications for device and base stations testing. He graduated from Otto-von-Guericke University in Magdeburg, Germany, and received a Master's Degree in communication engineering.
Connector Corner: Automate dynamic content and events by pushing a buttonDianaGray10
Here is something new! In our next Connector Corner webinar, we will demonstrate how you can use a single workflow to:
Create a campaign using Mailchimp with merge tags/fields
Send an interactive Slack channel message (using buttons)
Have the message received by managers and peers along with a test email for review
But there’s more:
In a second workflow supporting the same use case, you’ll see:
Your campaign sent to target colleagues for approval
If the “Approve” button is clicked, a Jira/Zendesk ticket is created for the marketing design team
But—if the “Reject” button is pushed, colleagues will be alerted via Slack message
Join us to learn more about this new, human-in-the-loop capability, brought to you by Integration Service connectors.
And...
Speakers:
Akshay Agnihotri, Product Manager
Charlie Greenberg, Host
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.
Kubernetes & AI - Beauty and the Beast !?! @KCD Istanbul 2024Tobias Schneck
As AI technology is pushing into IT I was wondering myself, as an “infrastructure container kubernetes guy”, how get this fancy AI technology get managed from an infrastructure operational view? Is it possible to apply our lovely cloud native principals as well? What benefit’s both technologies could bring to each other?
Let me take this questions and provide you a short journey through existing deployment models and use cases for AI software. On practical examples, we discuss what cloud/on-premise strategy we may need for applying it to our own infrastructure to get it to work from an enterprise perspective. I want to give an overview about infrastructure requirements and technologies, what could be beneficial or limiting your AI use cases in an enterprise environment. An interactive Demo will give you some insides, what approaches I got already working for real.
Dev Dives: Train smarter, not harder – active learning and UiPath LLMs for do...UiPathCommunity
💥 Speed, accuracy, and scaling – discover the superpowers of GenAI in action with UiPath Document Understanding and Communications Mining™:
See how to accelerate model training and optimize model performance with active learning
Learn about the latest enhancements to out-of-the-box document processing – with little to no training required
Get an exclusive demo of the new family of UiPath LLMs – GenAI models specialized for processing different types of documents and messages
This is a hands-on session specifically designed for automation developers and AI enthusiasts seeking to enhance their knowledge in leveraging the latest intelligent document processing capabilities offered by UiPath.
Speakers:
👨🏫 Andras Palfi, Senior Product Manager, UiPath
👩🏫 Lenka Dulovicova, Product Program Manager, UiPath
Slack (or Teams) Automation for Bonterra Impact Management (fka Social Soluti...Jeffrey Haguewood
Sidekick Solutions uses Bonterra Impact Management (fka Social Solutions Apricot) and automation solutions to integrate data for business workflows.
We believe integration and automation are essential to user experience and the promise of efficient work through technology. Automation is the critical ingredient to realizing that full vision. We develop integration products and services for Bonterra Case Management software to support the deployment of automations for a variety of use cases.
This video focuses on the notifications, alerts, and approval requests using Slack for Bonterra Impact Management. The solutions covered in this webinar can also be deployed for Microsoft Teams.
Interested in deploying notification automations for Bonterra Impact Management? Contact us at sales@sidekicksolutionsllc.com to discuss next steps.
"Impact of front-end architecture on development cost", Viktor TurskyiFwdays
I have heard many times that architecture is not important for the front-end. Also, many times I have seen how developers implement features on the front-end just following the standard rules for a framework and think that this is enough to successfully launch the project, and then the project fails. How to prevent this and what approach to choose? I have launched dozens of complex projects and during the talk we will analyze which approaches have worked for me and which have not.
Essentials of Automations: Optimizing FME Workflows with ParametersSafe Software
Are you looking to streamline your workflows and boost your projects’ efficiency? Do you find yourself searching for ways to add flexibility and control over your FME workflows? If so, you’re in the right place.
Join us for an insightful dive into the world of FME parameters, a critical element in optimizing workflow efficiency. This webinar marks the beginning of our three-part “Essentials of Automation” series. This first webinar is designed to equip you with the knowledge and skills to utilize parameters effectively: enhancing the flexibility, maintainability, and user control of your FME projects.
Here’s what you’ll gain:
- Essentials of FME Parameters: Understand the pivotal role of parameters, including Reader/Writer, Transformer, User, and FME Flow categories. Discover how they are the key to unlocking automation and optimization within your workflows.
- Practical Applications in FME Form: Delve into key user parameter types including choice, connections, and file URLs. Allow users to control how a workflow runs, making your workflows more reusable. Learn to import values and deliver the best user experience for your workflows while enhancing accuracy.
- Optimization Strategies in FME Flow: Explore the creation and strategic deployment of parameters in FME Flow, including the use of deployment and geometry parameters, to maximize workflow efficiency.
- Pro Tips for Success: Gain insights on parameterizing connections and leveraging new features like Conditional Visibility for clarity and simplicity.
We’ll wrap up with a glimpse into future webinars, followed by a Q&A session to address your specific questions surrounding this topic.
Don’t miss this opportunity to elevate your FME expertise and drive your projects to new heights of efficiency.
Let's dive deeper into the world of ODC! Ricardo Alves (OutSystems) will join us to tell all about the new Data Fabric. After that, Sezen de Bruijn (OutSystems) will get into the details on how to best design a sturdy architecture within ODC.
Builder.ai Founder Sachin Dev Duggal's Strategic Approach to Create an Innova...Ramesh Iyer
In today's fast-changing business world, Companies that adapt and embrace new ideas often need help to keep up with the competition. However, fostering a culture of innovation takes much work. It takes vision, leadership and willingness to take risks in the right proportion. Sachin Dev Duggal, co-founder of Builder.ai, has perfected the art of this balance, creating a company culture where creativity and growth are nurtured at each stage.
PHP Frameworks: I want to break free (IPC Berlin 2024)Ralf Eggert
In this presentation, we examine the challenges and limitations of relying too heavily on PHP frameworks in web development. We discuss the history of PHP and its frameworks to understand how this dependence has evolved. The focus will be on providing concrete tips and strategies to reduce reliance on these frameworks, based on real-world examples and practical considerations. The goal is to equip developers with the skills and knowledge to create more flexible and future-proof web applications. We'll explore the importance of maintaining autonomy in a rapidly changing tech landscape and how to make informed decisions in PHP development.
This talk is aimed at encouraging a more independent approach to using PHP frameworks, moving towards a more flexible and future-proof approach to PHP development.
JMeter webinar - integration with InfluxDB and GrafanaRTTS
Watch this recorded webinar about real-time monitoring of application performance. See how to integrate Apache JMeter, the open-source leader in performance testing, with InfluxDB, the open-source time-series database, and Grafana, the open-source analytics and visualization application.
In this webinar, we will review the benefits of leveraging InfluxDB and Grafana when executing load tests and demonstrate how these tools are used to visualize performance metrics.
Length: 30 minutes
Session Overview
-------------------------------------------
During this webinar, we will cover the following topics while demonstrating the integrations of JMeter, InfluxDB and Grafana:
- What out-of-the-box solutions are available for real-time monitoring JMeter tests?
- What are the benefits of integrating InfluxDB and Grafana into the load testing stack?
- Which features are provided by Grafana?
- Demonstration of InfluxDB and Grafana using a practice web application
To view the webinar recording, go to:
https://www.rttsweb.com/jmeter-integration-webinar
GraphRAG is All You need? LLM & Knowledge GraphGuy Korland
Guy Korland, CEO and Co-founder of FalkorDB, will review two articles on the integration of language models with knowledge graphs.
1. Unifying Large Language Models and Knowledge Graphs: A Roadmap.
https://arxiv.org/abs/2306.08302
2. Microsoft Research's GraphRAG paper and a review paper on various uses of knowledge graphs:
https://www.microsoft.com/en-us/research/blog/graphrag-unlocking-llm-discovery-on-narrative-private-data/
DevOps and Testing slides at DASA ConnectKari Kakkonen
My and Rik Marselis slides at 30.5.2024 DASA Connect conference. We discuss about what is testing, then what is agile testing and finally what is Testing in DevOps. Finally we had lovely workshop with the participants trying to find out different ways to think about quality and testing in different parts of the DevOps infinity loop.
UiPath Test Automation using UiPath Test Suite series, part 3DianaGray10
Welcome to UiPath Test Automation using UiPath Test Suite series part 3. In this session, we will cover desktop automation along with UI automation.
Topics covered:
UI automation Introduction,
UI automation Sample
Desktop automation flow
Pradeep Chinnala, Senior Consultant Automation Developer @WonderBotz and UiPath MVP
Deepak Rai, Automation Practice Lead, Boundaryless Group and UiPath MVP
3. 1 - Overview
Long and dense routes provided the
economic drivers to maximize ROI.
DWDM was perfected in the 1990’s.
Undersea cables met this criteria early.
Transcontinental fiber routes were next.
“Fiber Glut” was a consequence.
R/W issues and unexpected circuit
demand became local applications.
Communication Consultants-
July 2006 Fargo, ND 3
4. Overview
Short and multi-protocol routes had unique
drivers in special applications like Metro’s and
video headends.
CWDM has lower density but is also 40% lower in
cost than DWDM.
Video feeds with a variety of analog, digital, RF
and control protocols were perfect for CWDM.
CWDM is very cost effective in providing circuit
relief in lower density TDM Sonet networks.
Original CWDM was developed in the 1980’s for
MMF.
Communication Consultants-
July 2006 Fargo, ND 4
5. Overview
To fully understand the unique problems and
benefits of WDM, the characteristics of legacy
and current fiber production will be explored.
Section 2 on “Fiber Characteristics” discusses
the main issues and today’s answers.
CWDM development and specs are discussed
in section 3. It was an original 1980’s product
which is now revitalized.
DWDM development and specs are discussed
in section 4. It was developed in the 1990’s.
Communication Consultants-
July 2006 Fargo, ND 5
6. Overview
Current applications and current
strategies are discussed in section 5.
The “Best Fit” parameters and current
research on WDM improvements
provide insight on expected future
applications.
Communication Consultants-
July 2006 Fargo, ND 6
7. 2-Fiber Cable WDM Characteristics
1st window-1970’s
2nd window-1980’s
3rd window-1990’s
Each “Window” provides a historical perspective on cable technology
Communication Consultants-
July 2006 Fargo, ND 7
8. Fiber Types - Construction
Cladding
Core LED
Laser
Cross section Muliti Mode
Cladding
Core
Laser
Single Mode
Multi-Mode Single-Mode
50/62.5um core, 125um clad 9um core, 125um cladding
Atten-MHz/km: 200 MHz/km Atten-dB/km: 0.4/0.3dB
Atten-dB/km: 3dB @ 850nm 1310nm/1550nm
MMF has an orange jacket SMF has a yellow jacket
Communication Consultants-
July 2006 Fargo, ND 8
9. Degradation In Fiber Optic
Cable
Attenuation
Loss of light power as the signal travels
through optical cable
Dispersion
Spreading of signal pulses as they travel
through optical cable
Communication Consultants-
July 2006 Fargo, ND 9
10. Dispersion
Communication Consultants-
July 2006 Fargo, ND 10
12. Dispersion Causes
Modal effects
Intermodal dispersion
Intramodal dispersion
Chromatic
Waveguide
Polarization mode
Communication Consultants-
July 2006 Fargo, ND 12
13. Dispersion causes
Scattering effects
Raleigh
Raman (SRS)
Brillouin (SBS)
Miscellaneous effects
Linear crosstalk
Four wave mixing
Cross phase modulation
Self phase modulation
Communication Consultants-
July 2006 Fargo, ND 13
14. Attenuation vs. Wavelength
”classic” non-dispersion shifted SMF cable
Communication Consultants-
July 2006 Fargo, ND 14
15. Low Water Peak
Nondispersion Shifted Fiber
Optimizes SMF fiber for WDM applications in
the 1285nm to 1625nm region by reducing
the classic OH peak.
ITU standard typically 0.2 dB/ Km at 1550nm.
(ITU-T G.652.C)
Zero dispersion wavelength is in the standard
1310nm region.
Reduces / eliminates the water peak by
improved manufacturing process.
Communication Consultants-
July 2006 Fargo, ND 15
16. Dispersion shifted fiber
Zero dispersion shifted fiber moves the
“neutral” dispersion wavelength to the 1550
low attenuation window. (ITU G.653)
Because of DWDM FWM (Four Wave Mixing)
newer Nonzero Dispersion shifted fiber was
developed and replaces Zero dispersion
shifted fibers. (ITU G.655)
NZD- and NZD+ fiber move the zero dispersion
wavelength to either side of the 1550nm point.
Communication Consultants-
July 2006 Fargo, ND 16
17. CWDM Optical Spectrum
20nm spaced wavelengths
Communication Consultants-
July 2006 Fargo, ND 17
18. DWDM vs. CWDM Spectrum
1.6nm Spacing ITU-T G.694.1 standard
DWDM Region
dB
1470 1490 1510 1530 1550 1570 1590 1610
Wavelength
CWDM 20nm channel spacing
Communication Consultants-
July 2006 Fargo, ND 18
19. 3 – CWDM
Originally developed in the 1980’s for adding capacity
to multi-mode fiber cable routes in campus LAN’s.
25nm spacing in the 850 nm window.
About 1995, CWDM was revitalized with SMF
wavelengths for metro area fiber route capacity
increases.
The “original” band at 1310nm was used.
Currently the latest ITU spec G.694.2 defines 18
channels in 5 bands with 20nm spacing.
The bands are the O, E,S,C and L.
The E band includes the 1385nm water peak so is the last
one implemented unless low WP cable is used.
Typical capacity of 50Mb to 2.7Gb
Communication Consultants-
July 2006 Fargo, ND 19
20. CWDM
Advantages
Simpler technology allows:
Lower power consumption- 20%
Smaller space requirements- 30%
Can use SMF or MMF cable
Can use LED’s or Laser’s for power
Larger individual payloads per channel
Smaller and cheaper wave filters
Cost savings on start up and expansion
Communication Consultants-
July 2006 Fargo, ND 20
21. CWDM
Disadvantages
Less capacity than DWDM
Less range
Regeneration vs. amplification
O, A and M functions are not carrier class
Communication Consultants-
July 2006 Fargo, ND 21
22. 4 – DWDM
Developed in the early 1990’s to add capacity to
undersea and transcontinental routes.
Uses the 1500nm to 1600nm band which has
minimum attenuation for long distance routes.
Operates in the prime EDFA region
EDFA amps provide maximum distance
Can provide typical 2 to 128 channels of capacity
Channel spacing is likely 0.8nm for economy
Typically operates at 2.4Gb and 10Gb
ITU channel plan is G.694.1 (1200ch @ 0.1nm)
Communication Consultants-
July 2006 Fargo, ND 22
23. DWDM
Advantages
Maximum capacity system available
Maximum distance capability with EDFA’s
Repeater “amp” sites can be reduced
MCI and ATT reduced sites by 30%
Pay as you grow expansion
Mature O, A and M systems are developed
Communication Consultants-
July 2006 Fargo, ND 23
24. DWDM
Disadvantages
Complex technology requires:
more space
more power
high accuracy lasers and wave filters
Expensive EDFA’s for amplifiers
Start up costs are more than equivalent
CWDM
Communication Consultants-
July 2006 Fargo, ND 24
25. 5- Applications- CWDM
CWDM is very flexible and has adapted to
specialized applications such as:
Video headend feeds for multi protocol signals
Campus LAN expansion
Lower density capacity “fixes”
Short distance capacity “fixes”
Metro area distribution and expansion
Data center storage routes
Spur routes for DWDM systems
Applications where low start up and expansion
rules vs the alternative DWDM choices
Communication Consultants-
July 2006 Fargo, ND 25
26. Applications - DWDM
DWDM is the proven “workhorse” of the
high capacity and long distance
carrier’s.
Many products are available from most
traditional transport suppliers.
The O, A and M capabilities are world
class.
Secondary market systems are available
which can significantly reduce costs.
Communication Consultants-
July 2006 Fargo, ND 26
27. Applications – Future?
CWDM continues to evolve into
specialized applications.
Combination transport and optical routers
or switches are being developed now.
Add- on CWDM cards are being included
in more transport devices as low cost
options.
Suppliers are continuing to drive down
costs and increase capacity.
Communication Consultants-
July 2006 Fargo, ND 27
28. Applications- Future?
DWDM research is working on increasing the
capacity and distance of future DWDM
products.
Wide Spectrum DWDM is on the future horizon
and will offer more channels.
The electronics and chip industry is constantly
increasing quality yields which will drive costs
lower and increase capability.
Combination systems with CWDM and DWDM
capabilities are being produced now.
FTTP technology intends to expand capacity with
a “wavelength per home”.
Communication Consultants-
July 2006 Fargo, ND 28
29. 6- Summary
CWDM and DWDM technology
continues to advance and provide
solutions to applications not imagined
or feasible years ago. Each technology
provides a unique “fit” and will
complement not replace the other.
Communication Consultants-
July 2006 Fargo, ND 29
30. Thank You!
Special thanks is due to many authors and vendors who have
provided source material for this presentation. This presentation
is not meant as original research but as a compendium of many
sources.
Communication Consultants-
July 2006 Fargo, ND 30