<P>PROBLEM TO BE SOLVED: To provide an RZ-AMI optical transmitter and method for generating an RZ-AMI optical signal using the same in which ripples occurring on a space level of the eye diaphragm are removed so as to improve the receive sensitivity. <P>SOLUTION: The optical transmitter includes: a light source for radiating at its output an intensity-modulated light beam based upon intensity of inputted first data; a precoder for precoding out second data having the same data as the inputted first dataand and for outputting the data; and a Mach Zehnder modulator for phase-modulating out the intensity-modulated light on the basis of the precoded second data and for outputting the light. <P>COPYRIGHT: (C)2006,JPO&NCIPI 
RZ-AMI OPTICAL TRANSMITTER AND METHOD FOR GENERATING RZ-AMI OPTICAL SIGNAL USING THE SAME