Patent ID: 9537578
Date: 2017-01-03
CPC Classifications: H04B

Claim:
1. A system for optimally equalizing distortion of an optical data channel carrying coherent optical signals with a given analog bandwidth B 1 [GHz] and a symbol rate of B 2 [GSymbols/sec], comprising: a) an Anti-Aliasing Filter with a cutoff frequency which corresponds to N, for reducing the bandwidth of detected optical signals by a factor of N by filtering said optical signals; b) an Analog to Digital Converter for sampling said optical signals at the output of said Anti-Aliasing Filter using a single sample per symbol and c) a digital post processing unit with a processor operating at a processing rate being equal to a sampling rate and to the symbol rate, for: wherein said digital post processing unit comprises a decoder being capable of reconstructing an input data stream by optimally compensating known deterministic Inter Symbol Interference, introduced by said Anti-Aliasing Filter, and reconstructing an input data stream and to optimally decode the output of said processor; said digital processing unit comprises: