OPTICALLY RESTORABLE WDM RING NETWORK USING SIMPLE ADD DROP CIRCUITRY/

An optically restorable wavelength division multiplexing (WDM) ring ne twork carrying ATM traffic is presented. It uses a new architecture wi th simple add/drop circuitry allowing traffic restoration in case of a ring breakage by independent local actions at the affected nodes. Mul tisession video traffic at 155 Mb/s was demonstrated between stations distributed along the ring, No visible video degradation was observed during the 50 ms restoration time caused by a ring breakage.