A Multi-Path Routing Method with Traffic Grooming Corresponding to Path Lengths in Elastic Optical Networks

Motoi KATO
Ken-ichi BABA

Publication
IEICE TRANSACTIONS on Communications   Vol.E105-B    No.9    pp.1033-1038
Publication Date: 2022/09/01
Publicized: 2022/03/22
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2021EBP3196
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
elastic optical network,  multi-path routing,  traffic grooming,  modulation level,  

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Summary: 
To accommodate an increasing amount of traffic efficiently, elastic optical networks (EON) that can use optical spectrum resources flexibly have been studied. We implement multi-path routing in case we cannot allocate the spectrum with single-path routing. However, multi-path routing requires more guard bands to avoid interference between two adjacent optical paths when compared with single-path routing in EON. A multi-path routing algorithm with traffic grooming technology has been proposed. The researchers assumed that a uniform modulation level was adopted, and so they did not consider the impact of path length on the resources needed. In this paper, we propose a multi-path routing method with traffic grooming considering path lengths. Our proposed method establishes an optical multi-path considering path length, fiber utilization, and the use of traffic grooming. Simulations show we can decrease the call-blocking probability by approximately 24.8% in NSFNET. We also demonstrate the effectiveness of traffic grooming and the improvement in the utilization ratio of optical spectrum resources.