Single-Hop and Multihop WDM Optical Networks

Authored by: Partha Pratim Sahu

Fundamentals of Optical Networks and Components

Print publication date:  July  2020
Online publication date:  July  2020

Print ISBN: 9780367265458
eBook ISBN: 9780429293764
Adobe ISBN:


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There are three generations of optical network identified based on physical level structure. The first generation includes networks before fiber-optic technology [1–5], which is already discussed in Chapter 6. The second generation exhibits network with optical fiber technology [6–9] in traditional architecture without all-optical devices such as WDM and optical switches. These second-generation networks are also discussed in Chapter 6. Although some improvement in performances such as higher data rates, lower bit error rates (BER) and reduced electromagnetic coupling are made by using optical fiber in second generation, the limitation of this generation in data rates is due to the use of electro to optic and optic to electro converter during amplification switching and multiplexing. These limitations are removed by using an all-optical concept in which once the information enters the network, it may remain in the optical domain until it is delivered to the destination (avoiding any electrical bottleneck. This all-optical concept is used in third generation. This chapter begins with a discussion on a local lightwave network employing WDM constructed based on a passive-star coupler (PSC). These networks are of two types – single-hop and multihop. In single-hop network only one via is used for the establishment of connection, whereas in multihop networks, single or more than one via nodes may be used for the establishment of the connection request.

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