Patent ID: 6433906
Filing Date: 2002-08-13
Classification: H04B,H04N

Abstract:
In a communications system including an optical transmitter for transmitting digital optical signals via a communications medium to an optical receiver, the optical receiver comprising:a detector for receiving a digital optical signal and for converting said digital optical signal to a serial stream of electrical pulses; a serial-to-parallel converter for converting said serial stream of electrical pulses to a set of parallel outputs corresponding to a digital word; a first digital filter coupled to said serial-to-parallel converter and adapted to filter said digital word, wherein said first digital filter comprises at least one bandpass filter, and wherein the at least one bandpass filter is adapted to filter a different spectral portion of said digital word; a second digital filter coupled to said first digital filter, said second digital filter adapted to filter said filtered digital word, wherein said second digital filter comprises at least one adaptive estimation filter, and wherein each adaptive estimation filter is coupled to each bandpass filter; and a digital to analog converter coupled to the second digital filter for converting the filtered digital word to an analog electrical signal.