Pre-Adjustment Rerouting for Wavelength Defragmentation in Optical Transparent WDM Networks

Akihiro KADOHATA  Atsushi WATANABE  Akira HIRANO  Hiroshi HASEGAWA  Ken-ichi SATO  

IEICE TRANSACTIONS on Communications   Vol.E98-B   No.10   pp.2014-2021
Publication Date: 2015/10/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E98.B.2014
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission for Communications
optical transparent wdm networks,  reconfiguration,  defragmentation,  

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We propose a new extension to reconfiguration algorithms used to address wavelength defragmentation to enhance the path accommodation efficiency in optical transparent wavelength division multiplexing networks. The proposed algorithm suppresses the number of fibers employed to search for a reconfigurable wavelength channel by combining routes between the target path and the existing path in a reconfigured wavelength channel. This paper targets three main phases in reconfiguration: i) the reconfiguration trigger; ii) redesign of the wavelength path; and iii) migrating the wavelength paths. The proposed and conventional algorithms are analyzed from the viewpoints of the number of fibers, accommodation rate and the number of migrating sequences. Numerical evaluations show that the number of fibers is suppressed by 9%, and that the accommodation efficiency is increased by approximately 5%-8% compared to when reconfiguration is not performed.