Patent ID: 7142343

Claim:
An electro-absorptive optical modulator module that is monolithically-integrated on a semiconductor substrate, the electro-absorptive optical modulator module comprising: a distributed feedback laser having a grating so as to oscillate light output by the laser and outputting the oscillated light through a first end and a second end of the distributed feedback laser, the first and second ends having different widths; an electro-absorptive modulator for modulating a first light output through the first end of the distributed feedback laser; an optical detector for detecting a second light output through the second end, the optical detector being formed opposite to the second end of the distributed feedback laser on the semiconductor substrate; and a first inner window for attenuating intensity of the second light and electrically insulating the distributed feedback laser and the optical detector from each other, wherein the first inner window is arranged between the distributed feedback laser and the optical detector.