Patent ID: 6873636

Claim:
A semiconductor laser module, comprising: a package having a plurality of external electrode terminals; a support substrate encapsulated in the package; a semiconductor laser fixed onto the support substrate and encapsulated in the package, respective electrodes of the semiconductor laser and the external electrode terminals being electrically within the package; and an optical fiber which extends over the inside and outside a case for the package and has an inner end that faces an outgoing surface of the semiconductor laser so as to take in laser light emitted from the semiconductor laser, wherein the semiconductor laser includes: a first area, a second area and a third area formed over a semiconductor substrate; a high-resistance layer formed over the semiconductor substrate; a first semiconductor layer of first conductivity type formed over the high-resistance layer; an active layer formed over the first semiconductor layer; a second semiconductor layer of second conductivity type corresponding to conductivity type opposite to the first conductivity type, the second semiconductor layer being formed over the active layer; a first isolation trench which divides the second semiconductor layer and the active layer into the first area and the second area; a second isolation trench which divides the first and second semiconductor layers and the active layer into the first area and a third area; an insulating film having an opening, which is formed over the second semiconductor layer; a first electrode formed over the insulating film in the first area and electrically connected to the second semiconductor layer; a second electrode formed over the insulating film in the second area and electrically connected to the first semiconductor layer; and a third electrode formed over the insulating film in the third area and electrically connected to the first electrode.