| 摘要 |
PURPOSE:To incorporate a monitor element simply into a monolithic LD by positively generating beams at a transverse mode (beams except an axial mode), subjecting the beams to loss in a laser chip and detecting the lost beams by the monitor element. CONSTITUTION:A bending section is formed and the radiation of beams in the transverse direction is increased in a laser striped pattern, a p-electrode 5, and a p-electrode 6 for a p-i-n diode is shaped along and near the bending section of the laser striped pattern so as to be easy to receive beams in the transvers direction. A LD and the p-i-n diode use the same active layer, and a bias is applied in the forward direction of the LD and beams leaking in the transverse direction from the active layer are received by the active in the p-i-n diode biassed in the opposite direction and monitored. Both end surfaces of the LD formed in this manner can be shaped by cleavage planes regardless of a monitor element, thus resulting in no lowering of a laser output and no change with time.
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