Proposal of a Simple Ultra-Low Contention CD ROADM

Ayako IWAKI  Akio SAHARA  Mitsunori FUKUTOKU  

IEICE TRANSACTIONS on Communications   Vol.E99-B    No.8    pp.1772-1779
Publication Date: 2016/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2015CCP0030
Type of Manuscript: Special Section PAPER (Special Section on Advanced Information and Communication Technologies and Services in Conjunction with Main Topics of APCC2015)
Category: Fiber-Optic Transmission for Communications
colorless,  directionless,  intra-node contention,  add/drop bank,  wavelength usage ratio,  transponder usage ratio,  

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We propose a simple configuration for colorless and directionless (CD) reconfigurable optical add/drop multiplexers that enables ultra-low contention add/drop operation to be achieved. In the configuration, we apply a combination of multiple small-port-count CD add/drop banks (CD banks) and round-robin CD bank assignment. Evaluation results show that the proposed configuration can substantially reduce intra-node contention rate, which is less than 0.1%. We also find that the proposed configuration can improve the utilization efficiency of wavelength resources and transponders. We discuss the mechanism of how the proposed configuration reduces intra-node contention by analyzing the status of wavelength assignments in direction ports and CD banks.