Patent ID: 9164349
Filing Date: 2015-10-20
Classification: G02B,G02F

Abstract:
1. An optical semiconductor device in which a first light source, a second light source, a first optical modulator, a second optical modulator, and an optical multiplexer are integrated together on a semiconductor substrate, wherein: the first light source outputs light having a first polarization, the second light source outputs light having a second polarization different from the first polarization, the first optical modulator is optically connected to an output side of the first light source and modulates the light that is output from the first light source to output a light signal, the second optical modulator is optically connected to an output side of the second light source and modulates the light that is output from the second light source to output a light signal, the optical multiplexer couples the light signal that is output from the first optical modulator with the light signal that is output from the second optical modulator to output a coupled light signal, at least one of the first light source and the second light source is a wavelength-tunable laser, and the first light source and the second light source are able to allow a wavelength of the light that is output from one light source of the first light source and the second light source to approach a wavelength of the light that is output from the other light source thereof.