A receiver is disclosed for receiving coded optical a signals in an optical asynchronous communications system using a CDMA method based on periodic spectrum encoding. It has a first optical detector unit (PD1) and a second optical detector unit (PD2) which are preceded by a first periodic optical filter...http://www.google.de/patents/US6404528?utm_source=gb-gplus-sharePatent US6404528 - Receiver for an optical communications system and method for operating such a system
