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Trading Regeneration and Spectrum Utilization in Code-Rate Adaptive Flexi-Grid Networks | IEEE Journals & Magazine | IEEE Xplore

Trading Regeneration and Spectrum Utilization in Code-Rate Adaptive Flexi-Grid Networks

Publisher: IEEE

Abstract:

Introduced to improve the spectral efficiency, time-frequency packing technique allows the exploitation of different code rates, leading to different levels of spectral u...View more
Notes: This article was originally published online with incorrect pagination (pp 3894-3901), which has been corrected along with the metadata to enable proper citation.

Abstract:

Introduced to improve the spectral efficiency, time-frequency packing technique allows the exploitation of different code rates, leading to different levels of spectral utilization and all-optical reach. To ensure quality of transmission of the optical signal, opto-electronic regeneration must be used to propagate the transmission beyond the maximum optical reach and can inherently offer conversion of spectrum and code rate. In this way, multiple code rates can be enabled in optical networks, leading to a flexible design in which spectrum utilization and regeneration can be properly optimized and traded. This paper addresses for the first time the joint problem of selecting the code rate, the regeneration nodes, the spectrum allocation and the route for the requested lightpaths in an optical network with a flexi-grid. A genetic algorithm is proposed that balances the contrasting objectives of minimizing the regeneration nodes and the spectrum utilization. Results show that when regeneration nodes are minimized, code-rate adaptation is able to reduce the regeneration nodes as well as the spectrum utilization with respect to rate-fixed optical networks. In general, a balance of the two contrasting objectives is preferred to achieve a low resource utilization.
Notes: This article was originally published online with incorrect pagination (pp 3894-3901), which has been corrected along with the metadata to enable proper citation.
Published in: Journal of Lightwave Technology ( Volume: 32, Issue: 23, 01 December 2014)
Page(s): 4496 - 4503
Date of Publication: 19 September 2014

ISSN Information:

Publisher: IEEE

Funding Agency:


I. Introduction

The fast and continuous increase of traffic load in optical networks prompts the support of multiple line rates to enable adaptation to traffic variations [1]– [4] as well as of transmission techniques that improve the spectral efficiency of optical communications [5]– [9]. Examples of spectral efficient solutions are the use of high-order modulation formats (e.g., polarization multiplexing 16 quadrature amplitude modulation — PM-16QAM) or faster-than-Nyquist transmission techniques [5]. In both cases, more bits can be squeezed in a Hz of bandwidth, allowing for a flexible upgrade planning of the network. Thus, optical networks can be optimized by selecting the best rate and/or modulation format for each requested optical channel or lightpath, leading to a multi rate and multi modulation format design.

References

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