Comparison of Spectral and Spatial Super-Channel Allocation Schemes for SDM Networks
- 6 April 2016
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in Journal of Lightwave Technology
- Vol. 34 (11), 2710-2716
- https://doi.org/10.1109/jlt.2016.2551299
Abstract
We evaluate the advantages of using the extra dimension introduced by space-division multiplexing (SDM) for dynamic bandwidth-allocation purposes in a flexible optical network. In that respect, we aim to compare spectral and spatial super-channel (Sp-Ch) allocation policies in an SDM network based on bundles of SMFs (to eliminate coupling between spatial dimensions from the study) and to investigate the role of modulation format selection in the blocking probability performance with an emphasis on the spectral efficiency (SE)/reach tradeoff for different multiline-rate scenarios, created either by changing the number of sub-channels (Sb-Ch), or by employing different modulation formats. Our network-performance results show that DP-8QAM -in a multichannel (MC) single-modulation-format system assuming ITU-T 50-GHz WDM Sb-Ch spectrum occupation-offers the best compromise between SE and optical reach for both spectral and spatial Sp-Ch allocation policies. They also reveal that an MC multimodulation-format system improves the network performance, particularly for spectral Sp-Ch allocation with Sb-Ch spectrum occupation of 37.5 GHz on the 12.5-GHz grid. Additionally, as another important contribution of the paper, we investigate, for spatial Sp-Ch allocation, the performance of several SDM switching options: independent switching (InS), which offers highest flexibility, joint-switching (JoS), which routes all spatial modes as a single entity, and fractional-joint switching, which separates out the spatial modes into sub-sets of spatial modes which are routed independently. JoS is proved to offer a similar performance to that of InS for particular network load profiles, while allowing a significant reduction in the number of wavelength-selective switches.Funding Information
- European Commission's Seventh Framework Program (FP7/2012-2015)
- INSPACE project (619732)
This publication has 28 references indexed in Scilit:
- Investigation of Spectrum Granularity for Performance Optimization of Flexible Nyquist-WDM-Based Optical NetworksJournal of Lightwave Technology, 2015
- Wavelength-selective switch with direct few mode fiber integrationOptics Express, 2015
- Evaluating the Optimum Filter Resolution and Sub-Channel Spectrum Granularity for Flexible Super-ChannelsPublished by Optica Publishing Group ,2015
- Wavelength-Selective Switches for Mode-Division Multiplexing: Scaling and Performance AnalysisJournal of Lightwave Technology, 2014
- Experimental comparison between Nyquist-WDM and continuous DFT-S-OFDM systemsPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2014
- 1x11 few-mode fiber wavelength selective switch using photonic lanternsOptics Express, 2014
- Mode-selective photonic lanterns for space-division multiplexingOptics Express, 2014
- Wavelength-selective Switch for Few-mode Fiber TransmissionPublished by Institution of Engineering and Technology (IET) ,2013
- Experimental Comparison of No-Guard-Interval-OFDM and Nyquist-WDM SuperchannelsPublished by Optica Publishing Group ,2012
- Routing and Spectrum Allocation in OFDM-Based Optical Networks with Elastic Bandwidth AllocationPublished by Institute of Electrical and Electronics Engineers (IEEE) ,2010