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Photonic Network Communications

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01-06-2015

Routing, modulation, spectrum and launch power assignment to maximize the traffic throughput of a nonlinear optical mesh network

Authors: David J. Ives, Polina Bayvel, Seb J. Savory

Published in: Photonic Network Communications | Issue 3/2015

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Abstract

We investigate the optimization of routing, modulation format adaptation, spectral and launch power assignment as a means of improving the utilization of limited network resources and increasing the network throughput. We consider a transparent optical network operating in the nonlinear transmission regime and using the latest software adapted coherent optical techniques. We separate the problem into one of routing, modulation adaption and channel assignment, followed by channel spectral assignment, and launch power allocation. It is shown, for three test networks, that the launch power allocation and channel spectral assignment can improve the transmission SNR margin over the fixed modulation, fixed power, fully loaded link worst case by approximately 3–4 dB. This increase in SNR margin can be utilized through modulation format adaption to increase the overall network throughput. This paper highlights that increased gains in network throughput can be achieved in nonlinear impaired networks when individual transmitter spectral assignment and launch power are optimized to minimize the nonlinear interference.

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Recently a number of authors [21‐23] have proposed correction terms to the GN model to overcome some of the GN model shortcomings particularly in the early spans of a transmission link where the accumulated chromatic dispersion is low. These correction terms reduce the expected nonlinear interference noise power for the modulation formats considered in this paper. We thus utilize the simpler GN model here under the assumption that it conservatively estimates the nonlinear interference noise and thus allows for robust network optimization.

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Title: Routing, modulation, spectrum and launch power assignment to maximize the traffic throughput of a nonlinear optical mesh network
Authors: David J. Ives
Polina Bayvel
Seb J. Savory
Publication date: 01-06-2015
Publisher: Springer US
Published in: Photonic Network Communications / Issue 3/2015
Print ISSN: 1387-974X
Electronic ISSN: 1572-8188
DOI: https://doi.org/10.1007/s11107-015-0488-0

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