Investigation of Spectrum Granularity for Performance Optimization of Flexible Nyquist-WDM-Based Optical Networks

The idea behind flexible optical transmission is to optimize the use of fiber capacity by flexibly assigning spectrum and data rate adapted to the needs of end-to-end connection requests. Several techniques have been proposed to this end. One such technique is based on the utilization of Nyquist-sha...

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Bibliographic Details
Published in:Journal of lightwave technology 2015-12, Vol.33 (23), p.4767-4774
Main Authors: Sayyad Khodashenas, Pouria, Rivas-Moscoso, Jose Manuel, Shariati, Behnam, Marom, Dan M., Klonidis, Dimitrios, Tomkos, Ioannis
Format: Article
Language:English
Subjects:
Allocations
Band spectra
Bandwidth
Channels
Digital filters
DWDM
Elastic optical network
Filtering
Flexi-grid
Guards
Network optimization
Optical fiber networks
Optical fibers
Optical filters
Optical transmitters
Optimization
Signal resolution
Spectra
Switching theory
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Summary:The idea behind flexible optical transmission is to optimize the use of fiber capacity by flexibly assigning spectrum and data rate adapted to the needs of end-to-end connection requests. Several techniques have been proposed to this end. One such technique is based on the utilization of Nyquist-shaping filters with the aim of reducing the required channel spacing in flexible single-carrier and super-channel optical transmission systems. Nonetheless, the imperfect shape of the filters used at the bandwidth-variable transceivers and wavelength-selective switches compels the necessity to allocate a certain spectral guard band between (sub-)channels. Bearing this is mind, in this paper, we focus on the evaluation of the network-level performance, in terms of the filter characteristics and the WDM frequency-grid granularity, of flexible Nyquist-WDM-based transmission. We demonstrate that a granularity of 6.25 GHz offers a good compromise between network performance and filter requirements for spectrum assignment to single-carrier and super-channel signals. However, for subchannel allocation within a super-channel, granularities as fine as 3.125 GHz are required to take advantage of filters with resolutions in the region of 1-1.2 GHz. Finer filter resolutions and frequency slot granularities provide negligible performance improvement.
ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2015.2484077