Abstract
New generation of optical nodes in dense wavelength division multiplexed networks enables operators to improve service flexibility and make significant savings, both in operational and capital expenditures. Thus the main objective of the study is to minimize optical node resources, such as transponders, multiplexers and wavelength selective switches, needed to provide and maintain high quality dense wavelength division multiplexed network services using new generation of optical nodes. A model based on integer programming is proposed, which includes a detailed description of an optical network node. The impact on the network performance of conventional reconfigurable optical add drop multiplexer technology is compared with colorless, directionless and contentionless approaches. The main focus of the presented study is the analysis of the network congestion problem arising in the context of both reconfigurable optical add drop multiplexer technologies. The analysis is supported by results of numerical experiments carried out for realistic networks of different dimensions and traffic demand sets.
Highlights
Colorless, Directionless and Contentionless Reconfigurable Optical Add Drop Multiplexers (CDC-ROADMs) have become an important element of optical transmission systems deployed by major network operators across the world
Computational results were obtained for four optical networks with widely varying parameters
The first network was generated artificially and consists of five nodes only while the other networks, i.e., Polish, German and US, correspond to actual optical networks stemming from specified countries and were taken from [17]
Summary
Directionless and Contentionless Reconfigurable Optical Add Drop Multiplexers (CDC-ROADMs) have become an important element of optical transmission systems deployed by major network operators across the world. Add Drop Multiplexers (C-ROADMs) fail to provide wavelength routing flexibility sufficient to meet system requirements resulting from rapid data traffic growth in optical networks [1] (CDC) [2,3,4]. C-ROADMs are limited by fixed wavelength assignment to specific ports and fixed direction assignment for multiplexers and can add/drop a wavelength only to a fixed outgoing direction. On the positive side C-ROADM architectures, based on Wavelength
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