Patent ID: 6490069
Filing Date: 2002-12-03
Classification: H04B,H04L

Abstract:
An optical communication system, comprising:a precoder for precoding an input sequence having M input levels into a first precoded sequence by differencing encoded sequences derived from said input sequence; a converter/driver for converting said first precoded sequence into a modulation drive signal; and an optical signal generator for receiving said drive signal and issuing a responsive optical electric field having field levels including at least two positive said field levels and at least two negative said field levels, a first of said positive field levels and a first of said negative field levels having mirror-image redundant representations of a first of said input levels, wherein said input sequence having said M said input levels results in said optical electric field having two times said M minus one (2Mâˆ’1) said field levels including a zero one of said field levels at approximately zero field level, said M minus one (Mâˆ’1) said positive field levels, and said M minus one (Mâˆ’1) said negative field levels.