Patent ID: 6407845
Filing Date: 2002-06-18
Classification: G02F,H04B

Abstract:
An optical transmitter utilizing a Mach-Zehnder type optical modulator, said Mach-Zehnder type optical modulator including: a light input end for receiving light; a first arm and a second arm for branching the light from said light input end to propagate the branched light, respectively; a light output end for synthesizing the branched light propagated through said first and second arms to output the resultant light; a first electrode for applying a first drive signal to the first arm to thereby drive the first arm; and a second electrode for applying a second drive signal to the second arm to thereby drive the second arm, comprising:amplitude adjusting parts for adjusting the respective amplitudes of the first and second drive signals; phase adjusting parts for adjusting the respective phases of the first and second drive signals; an amplitude controlling part for detecting the respective amplitudes of the first and second drive signals, to thereby feedback control the amplitude adjusting parts; and a phase controlling part for detecting the respective phases of the first and second drive signals, to thereby feedback control the phase adjusting parts.