Patent ID: 7020366

Claim:
A light emitting device comprising: a grating chip having a first end face, a second end face, and a diffraction grating; a semiconductor optical amplifier having a light emitting surface and a light reflecting surface and being optically coupled to the first end face of the grating chip; a fiber stub component including an optical fiber having a pair of end faces and being optically coupled to the second end face of the grating chip, and a ferrule having a pair of end faces; and a mount member having first, second, and third regions arranged along a predetermined axis, the mount member having a butt face provided between the second region and the third region so as to intersect with the predetermined axis, wherein the first region of the mount member has a ferrule support extending along the predetermined axis and supporting the ferrule, the second region has a grating chip support extending along the predetermined axis and supporting the grating chip, the third region has a device support on which the semiconductor optical amplifier is mounted, wherein the first end face of the grating chip is in contact with the butt face of the mount member, thereby forming an external cavity constituted by the diffraction grating of the grating chip and the light reflecting surface of the semiconductor optical amplifier, and a translucent resin, filling a clearance between the grating chip and the semiconductor optical amplifier and a clearance between the grating chip and the optical fiber of the fiber stub component.