Patent ID: 8311416

Claim:
An optical transmitter system comprising: a pre-coder for pre-coding an input signal into a pre-coded signal; an encoder/separator coupled to the pre-coded signal and arranged to encode the pre-coded signal into a first encoded signal with 0 degree phase shift and a second encoded signal with 180 degree phase shift, the encoder/separator comprising, a first differential limiting amplifier (LIA) for generating the first encoded signal based on the pre-coded signal and a delayed complement of the pre-coded signal, and a second LIA for generating the second encoded signal based on the complement of the pre-coded signal and a delayed pre-coded signal; and an optical modulator for providing optical modulation to the first and second encoded signals with a light source such that the intensity of an output optical duo binary (ODB) signal with frequency chirp has identical logic sequence as the input signal.