Patent ID: 6563623
Filing Date: 2003-05-13
Classification: H04B,H04L

Abstract:
A system for transmitting an optical signal in the form of an optical carrier wave modulated as a function of an input binary electrical signal, a clock rate defining successive time cells delimiting in the input signal first or second modulation levels, said system including a first electro-optical modulator adapted to respond to said input electrical signal by supplying a controlled phase optical signal having optical power modulated between low levels and high levels respectively corresponding to said first and second modulation levels of the input signal, and a phase shift within each time cell that contains a low power level and which precedes or succeeds a cell that contains a high power level, which system includes a second electro-optical modulator controlled by said input signal and optically coupled to the first electro-optical modulator to apply at least one of complementary power and phase modulation to said controlled phase optical signal so as to modify an extinction ratio of said controlled phase optical signal or to apply a transient chirp to said controlled phase optical signal, or both.