Survivability and Traffic Grooming in WDM Optical Networks by Arun Somani

By Arun Somani

The arrival of fiber optic transmission structures and wavelength department multiplexing has ended in a dramatic raise within the usable bandwidth of unmarried fiber platforms. This publication offers specific insurance of survivability (dealing with the chance of wasting huge volumes of site visitors information because of a failure of a node or a unmarried fiber span) and site visitors grooming (managing the elevated complexity of smaller person requests over excessive skill information pipes), either one of that are key matters in smooth optical networks.

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Capacity sharing among the primary and restoration paths is dedicated or shared. The dedicated technique uses one-to-one protection where each primary path has a corresponding restoration path. In the shared case, several primaries can share the same backup path as long as the primaries are node- and link-disjoint. This scheme Restoration approaches 37 is called the backup multiplexing technique [91]. These paradigms serve as a good framework for analyzing the different design methodologies, as each methodology uses a restoration model that is a combination of the above paradigms.

In DW-TDM networks, each source and destination pair are connected by a lightpath, where a lightpath is defined as an all-optical connection between two nodes. Calls between the source and the destination are multiplexed on the lightpath. If the bandwidth required by a new call at a node is not available on any of the existing lightpaths to the destination, a new lightpath to the destination is established. On the other hand, in SW-TDM networks, if a call cannot be accommodated on an existing lightpath to the destination, it is allowed to be multiplexed onto an existing lightpath to an intermediate node.

However, this simplicity also results in performance degradation because only one path is provided for each node-pair. A connection request is blocked if no wavelength is available on that path. Alternate-path routing, in which more than one candidate path is provided for a connection request, improves the network performance significantly compared to fixed-path routing. However, the candidate paths and their orders are predetermined without considering the current network status. Performance cannot be further improved with these static routing algorithms.

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