Multiple-star wavelength-router network and its protection strategy

摘要

A wavelength division multiplexed (WDM) multiple-star network andnits accompanying path and router protection strategies are proposed forninterconnecting N major switch nodes in a national-scalentelecommunications network. For a single path failure and uniformntraffic matrix, fiber requirements are shown to be less than for a WDMnADM ring, while providing greater resilience to multiple path failures.n“Adding” and “dropping” only whole wavelengthnchannels between node pairs is found to lead to severe designninstabilities and overinvestment in fiber, and time-sharing ofnwavelength channels is recommended to minimize fiber quantities. A starnnetwork capable of interconnecting N=22 switch nodes and an all-opticalnpath protection switching method are verified experimentally, using an16-channel 2,5-Gbit/s WDM system and a 22×22-port bulk-opticsnwavelength multiplexer as the hub router. Protection switching speedsnwithin 50 ms are projected for a national-scale network