Receiver for an optical communications system, filter device, and method for operating such a system

摘要

A receiver (R) is disclosed for receiving coded optical signals in an asynchronous optical transmission system using a CDMA method based on periodic spectrum encoding. The receiver (R) has a filter device (Rx) for decoding received signals as well as an optical detector unit (PD). The filter device (Rx) consists of a periodic filter (PRx) and a prefilter (VOR) whose transfer function causes the cosine transform of the optical frequency spectrum of the signal to be limited to a predeterminable range of a tuning curve. This reduces crosstalk between adjacent channels in the tuning range, and increases the maximum permissible number of transmitters.