Patent ID: 8149889
Filing Date: 2012-04-03
Classification: B82Y,H01S

Abstract:
1. A semiconductor laser device comprising: a semiconductor substrate; a laser diode provided on the semiconductor substrate, the laser diode including a first optical waveguide having a gain waveguide and a reflector region provided at one end of the first optical waveguide, the first optical waveguide extending in a light-propagation direction; a plurality of photodiodes including a first photodiode provided on the semiconductor substrate, a second photodiode and a third photodiode; a first wavelength-selective filter provided on the semiconductor substrate, the first wavelength-selective filter having periodic transmission peaks, and the first wavelength-selective filter being optically coupled between the first photodiode and the first optical waveguide through the one end of the first optical waveguide; and a second wavelength-selective filter having periodic transmission peaks, the second wavelength-selective filter being optically coupled between the second photodiode and the first optical waveguide, the period of the transmission peaks of the second wavelength-selective filter being different from the period of the transmission peaks of the first wavelength-selective filter, wherein the first optical waveguide of the laser diode, the first wavelength-selective filter and the first photodiode are arranged on the substrate in the light-propagation direction, and the reflector region of the laser diode is located between the first wavelength-selective filter and the first optical waveguide of the laser diode.