Patent ID: 7627011
Filing Date: 2009-12-01
Classification: B82Y,H01S

Abstract:
1. A distributed feedback semiconductor laser diode with a diffraction grating, comprising: an InP semiconductor region having a surface with a periodic undulation; an AlGaInAs semiconductor layer provided on the surface of the InP semiconductor region, the AlGaInAs semiconductor layer having a surface with an undulation that substantially traces the periodic undulation of the surface of the InP semiconductor region; an intermediate layer provided on another surface of the AlGaInAs semiconductor layer, the intermediate layer being made of a semiconductor material selected from a group consisting of GaInAsP, AlInAsP and AlGaInAsP; and an active layer provided on the intermediate layer, the active layer including a quantum well structure, wherein the InP semiconductor region, the AlGaInAs semiconductor layer and the intermediate layer constitute the diffraction grating.