An optical carrier drop/add transmission system and method for adding a signal to multiplexed input optical signals conveyed by an optical multiplex input line. The multiplexed input optical signals are demultiplexed to provide isolated input optical signals to an optical switch matrix comprising switches...http://www.google.de/patents/US6928244?utm_source=gb-gplus-sharePatent US6928244 - System and method of wavelength add/drop multiplexing having client configurability
