In an optical cross-connect system, incoming and outgoing fiber optic trunks carrying WTDM signals are terminated to first inlet ports and first outlet ports of an optical space switch. A wavelength division demultiplexer is connected to a second outlet port of the optical space switch and a wavelength...http://www.google.de/patents/US5457556?utm_source=gb-gplus-sharePatent US5457556 - Optical cross-connect system with space and wavelength division switching stages for minimizing fault recovery procedures
