Dynamic Subwavelength Protection Using High-Speed Optical Switches for Optical Metro Networks

Masahiro NAKAGAWA  Kyota HATTORI  Toshiya MATSUDA  Masaru KATAYAMA  Katsutoshi KODA  

IEICE TRANSACTIONS on Electronics   Vol.E99-C   No.2   pp.203-211
Publication Date: 2016/02/01
Online ISSN: 1745-1353
DOI: 10.1587/transele.E99.C.203
Type of Manuscript: Special Section PAPER (Special Section on Recent Advances in Photonics Technologies and Their Applications)
optical subwavelength switched networks,  optical switch,  protection,  time-slot allocation,  dynamic bandwidth re-optimization,  

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Flexible resource utilization in terms of adaptive use of optical bandwidth with agile reconfigurability is key for future metro networks. To address this issue, we focus on optical subwavelength switched network architectures that leverage high-speed optical switching technologies and can accommodate dynamic traffic cost-effectively. Although optical subwavelength switched networks have been attracting attention, most conventional studies apply static (pre-planned) protection scenarios in the networks of limited sizes. In this paper, we discuss optical switch requirements, the use of transceivers, and protection schemes to cost-effectively create large-scale reliable metro networks. We also propose a cost-effective adaptive protection scheme appropriate for optical subwavelength switched networks using our fast time-slot allocation algorithm. The proposed scheme periodically re-optimizes the bandwidth of both working and protection paths to prevent bandwidth resources from being wasted. The numerical examples verify the feasibility of our proposed scheme and the impact on network resources.