Akihiro Kadohata

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This paper studies the reconfiguration design and migration from an old path set to a new path set in multifiber wavelength-division-multiplexing networks. For the reconfiguration design phase, we introduce the functions of wavelength fragmentation cost and reconfiguration cost, and we propose a reconfiguration design that minimizes both wavelength(More)
This paper proposes the Pre-planning and Reconfiguration of Wavelength (PRW) scheme which achieves a fast and flexible optical path accommodation design that deals with sequential traffic demand and addresses the Routing and Wavelength Assignment (RWA) problem. The proposed scheme comprises four key steps. First, in the pre-planning stage, Integer Linear(More)
We analyze the effectiveness of applying fragmentation and reconfiguration costs from old paths to new ones in multi-fiber wavelength division multiplexing networks. Numerical evaluation using a 2×3 grid shows that the number of changed wavelengths is reduced by approximately 90% while retaining the effectiveness of the reconfiguration.
We propose a scalable and effective wavelength defragmentation algorithm that considers multiple fibers per link. The number of fibers is reduced by more than 14% in multiring-like networks based on numerical evaluation. OCIS codes: (060.4264) Networks, Wavelength assignment, (060.4510) Optical communications
We investigate adaptive reconfiguration of sub-lambda and wavelength paths to deal with unpredictable traffic demands. To accommodate traffic effectively, wavelength paths need to be reconfigured cooperatively with sub-lambda paths while minimizing the number of migration sequences. Therefore, we propose a scheme for sub-lambda and wavelength path(More)