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

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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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Notes

  1. 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.

  2. For the DWDM channel spacing and signal symbol rate used in this work, the assumption of well-spaced signals and insignificant FWM was found to lead to an error of only \(\approx 0.31\,\%\) on the value of \(X_m\) used in equation (7).

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Authors and Affiliations

  1. Department of Electronic and Electrical Engineering, University College London, London, UK

    David J. Ives, Polina Bayvel & Seb J. Savory

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  1. David J. Ives
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Correspondence to David J. Ives.

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This work was supported by the UK Engineering and Physical Sciences Research Council, through the Centre for Doctoral Training in Photonics Systems Development, EP/G037256/1, and programme grant UNLOC, EP/J017582/1, and The Royal Academy of Engineering / The Leverhulme Trust.

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Ives, D.J., Bayvel, P. & Savory, S.J. Routing, modulation, spectrum and launch power assignment to maximize the traffic throughput of a nonlinear optical mesh network. Photon Netw Commun 29, 244–256 (2015). https://doi.org/10.1007/s11107-015-0488-0

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