Optimization of Optical Networks Based on CDC-ROADM Technology

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.

A Comparative Evaluation of Nature Inspired Algorithms for Telecommunication Network Design

“…Hence, smaller calculation time is of clear benefit. Secondly, it was observed that the calculation time of standard optimization methods (e.g., ILP) growths rapidly with the number of network nodes [7]. Thus, for large networks, application of heuristic methods becomes indispensable.…”

“…However, the IP optimization results show that even if the IP approach is applicable, it is inefficient for larger networks since the design task is, in general, NP-complete [3]. The numerical efficiency limitations are particularly acute in the context of routing and wavelength assignment (RWA) [4][5][6] and routing and spectrum allocation (RSA) [7][8][9][10] problems, which are at the heart of DWDM network optimization. Moreover, the constraints and cost functions are in a general case nonlinear and thus may further complicate the situation.…”

Time Shared Optical Network (TSON): A Programmable Network Edge Solution for Multi-Access Support

“…It offers a flexible and multiplexed optical network infrastructure and on-demand guaranteed time-shared multi-granular services. This solution is a contentionless [5] solution through the deployment of a central resource allocation engine of route, wavelength, and time assignment, in charge of setting up the sub-wavelength paths.…”

Learning to Classify DWDM Optical Channels from Tiny and Imbalanced Data

“…SDN uses a logically centralized control plane in a DWDM network that is realized using purpose-built flexible hardware such as reconfigurable optical add/drop multiplexers (ROADMs), flexible line interfaces, etc. [7,8]. In modern DWDM optical networks, following the software defined network paradigm, DWDM network reconfiguration is becoming more frequent, making the evolving network more resilient and adapting faster to real changes in bandwidth demand so that network reconfigurations can closely match changes in bandwidth demand.…”