Patent ID: 9728938
Date: 2017-08-08
CPC Classifications: H01S

Claim:
1. A distributed reflection laser, comprising: an active region which includes an active layer which produces light when current is injected therein, a first diffraction grating layer having a first diffraction grating with a prescribed grating period, and a grating phase shift portion formed within the first diffraction grating layer, wherein the grating phase shift portion provides a grating phase shift not smaller than 1.57π but not larger than 1.83π and a first distributed reflection mirror region which is optically coupled to a first end of the active region as viewed along a direction of an optical axis, and which includes a second diffraction grating which has the same grating period as that of the first diffraction grating and reflects the light produced by the active region back into the active region; and a second distributed reflection mirror region which is optically coupled to a second end of the active region as viewed along the direction of the optical axis, and which includes a third diffraction grating which has the same grating period as that of the first diffraction grating and reflects the light produced by the active region back into the active region.