The present invention discloses an encoder and a decoder that are tunable, controllable, and have low amount of energy loss during encoding or decoding. The encoder comprises a 22 EO coupler, and an optical recirculating loop (waveguide) which comprises a semiconductor optic amplifier. The decoder comprises...http://www.google.de/patents/US6504969?utm_source=gb-gplus-sharePatent US6504969 - Tunable optical encoder and decoder
