Patent ID: 7059780

Claim:
An optical module comprising: a fiber stub including an optical fiber with a fiber grating, and a ferrule holding said optical fiber, said fiber having first and second end faces, said ferrule having first and second ends, the first end including a first end face, and the second end including a second end face, and said optical fiber extending from the first end to the second end of said ferrule, the first end face of said optical fiber being flush with the first end face of said ferrule, and the second end face of said optical fiber being flush with the second end face of said ferrule; a semiconductor optical amplifying device having a light-emitting face and a light-reflecting face, the light-emitting face opposing the second end face of said optical fiber, and the fiber grating and the light-reflecting face forming a laser cavity; a sleeve into which said fiber stub is fitted, the second end face of said optical fiber being arranged at an end of said sleeve, and said sleeve including a hollow portion at the other end thereof, and a hollow holder containing said optical amplifying device and having an upper wall with a through hole through which light emitted from said optical amplifying device passes, the upper wall having an outer face onto which said fiber stub is secured, and the second end face of said ferrule being in contact with the upper wall.