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Essential DWDM

A 2 day training course
**Due to the current COVID-19 isolation rules all our courses are being delivered via virtual instructor led learning until further notice**

DWDM training course description

A concise overview of Wave Division Multiplexing (WDM) with both Coarse Wave Division Multiplexing (CWDM) and Dense Wave Division Multiplexing (DWDM) being covered. The course starts with a review of the relevant elements of fibre transmission and multiplexing before then studying WDM components and architectures. Reliability, resilience and management are then followed by WDM services and futures.

Key outcomes from this course

By the end of the course delegates will be able to:
  • Explain the benefits of WDM.
  • Describe Dispersion and four way mixing.
  • Describe the different WDM equipment components.
  • Describe different WDM architectures.
  • Explain How DWDM works.

DWDM training course details

Who will benefit:
Anyone working with CWDM/DWDM.
Introduction to Telecommunications
2 days

Training approach

This structured course uses Instructor Led Training to provide the best possible learning experience. Small class sizes ensure students benefit from our engaging and interactive style of teaching with delegates encouraged to ask questions throughout the course. Quizzes follow each major section allowing checking of learning.

Overall ratings for this course:

Course review

"Very useful overview of the fundamentals of DWDM with some interesting insight for Telecoms professionals on the commercial role of the business as well."
R. P. IX reach
"Enjoyed the course. Interesting and well presented. "
E. N. Entec Engineering

DWDM training course contents

Fibre communications review
Optical transmission, Fibre characteristics, Fibre component parts. Multi Mode Fibre (MMF). Single Mode Fibre (SMF). Fibre connections. Lasers. Attenuations, dispersion, optical signal noise ratios (OSNR) and their effects. Channel Spacing and Signal Direction. Limiting factors to single wavelength.

WDM overview
Multiplexing, TDM, WDM benefits. WDM standards. CWDM vs. DWDM. Four Wave Mixing (FWM). Impact and countermeasures to FWM on WDM.

ITU G.694.2, channels, channel spacing.

ITU G.694.1, channels, channel spacing.

WDM Equipment Components
Equipment components and building blocks. Optical Terminal Multiplexers (OTM). Optical Add/Drop Multiplexers (OADM). Adding versus dropping. Optical Amplifiers. Erbium Doped Fibre Amplifiers (EDFA). Transponders and Combiners. WDM/DWDM Hubs. Optical and Electrical Cross Connects (OXCs/DXCs). Types of Cross Connects (Transparent/Opaque). Advantages and disadvantages of various Optical cross connects.

WDM Architectures
WDM network sections. Point-to-Point, Optical switches, mesh, ring and star topology. Example of combined WDM and other technology network. Wavelength converting transponders, 1R, 2R, 3R.

Protection for WDM
Sub 50ms failover. Equipment protection. Card protection. Y cable, Splitter protection. Far end laser control. Line protection. OMSP 1+1, OMSP 1:1, OMSP 1: N. Self healing optical ring. Sub Network Connection Protection (SNCP). Automatically Switched Optical Networks (ASON).

WDM Management Options
In band management. Out of band management. The Optical Supervisory Channel (OSC). OSC capabilities.

WDM services
WDM Access. Bit rates, Transparent Networks. Modulation, DQPSK. SDH over WDM. Migrating from SDH to DWDM. Ethernet over WDM, IP over WDM.

Optical Transport Networks
G.709, “digital wrapper”, Optical Channel Payload Unit (OPU), Optical Channel Transport Unit ( OTU), Optical Channel Data Unit (ODU). OTU1, OTU2, OTU3, OTU4.

WDM Futures
All optical amplification, Raman amplification, distributed, lumped. Bit rates. Solitons. Coherent technologies.

Why Choose Us

SNT trainers score an average of over 90% on the three main areas of:
  • Ability to teach
  • Technical knowledge
  • Answering questions
“Excellently presented by a very knowledgeable and enthusiastic trainer.” P.D. General Dynamics

We limit our maximum class size to 8 delegates; often we have less than this. This ensures optimal interactivity between delegates and instructor.
"Excellent course. The small class size was a great benefit…" M.B. IBM

We write our own courses; courseware does not just consist of slides and our slides are diagrams not bullet point text. A typical chapter provides clearly defined objectives with a chapter overview, slides with text underneath, a quiz at the end to check the learning of the students. Hands on exercises are at the end and are used to reinforce the theory.

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