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We propose a novel distributed self-protection scheme for WDM-PONs using circulator-AWG based wavelength router. The novel wavelength router enables proper routing of working and protection lightpaths of the uplink and downlink signals. Automatic protection switching is operated in a distributed control manner and thus ultra-short 0.7-µs protection switching time is achieved. Redundant fibers required for protection are minimized.

A novel distributed self-protection scheme for WDM-PON using a circulator-AWG based wavelength router