Abstract

We propose an extremely cost-effective optical-cross-connect (OXC) architecture that allows hitless port-count expansion with virtually no limit to meet incremental traffic growth at minimum cost. This is enabled by a new interconnection scheme of optical splitters and wavelength-selective switches (WSSs) in the express-switch part and that of transponder banks in the add/drop parts. The benefit is offset by slight constraint on routing flexibility, which is minimized with a newly developed interconnection algorithm. Extensive computer simulations are carried out to verify that the proposed OXC retains satisfactory routing capability without notable penalty even though smaller-degree WSSs (${1} \times {9}$) are utilized: it is compared with present fixed-port-count OXCs using larger-degree WSSs (${1} \times {20}$), which have no hitless extension capability. The proposed OXC with the proposed algorithm can drastically reduce OXC hardware cost. We analyze node-design parameters in terms of the routing performances of the OXC and search for the appropriate values. The effects of traffic churn ratio during network expansion and the geographic traffic distribution are investigated. The results verify the effectiveness and robustness of the OXC architecture and the expansion scheme; the number of WSSs needed and the necessary component WSS port count can be greatly reduced while the resultant link fiber increment is marginal (1%–5%), compared with the ideal OXC without any routing restriction.

© 2020 Optical Society of America

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