Patent ID: 9627853
Date: 2017-04-18
CPC Classifications: G02B,H01S

Claim:
1. An external resonator type light emitting system comprising a light source oscillating a semiconductor laser light and a grating device providing an external resonator with said light source; wherein said light source comprises an active layer oscillating said semiconductor laser light; wherein said grating device comprises an optical waveguide comprising an incident face to which said semiconductor laser light is incident and an emitting face of emitting an emitting light of single mode and having a desired wavelength, a Bragg grating formed in said optical waveguide, and a propagating portion provided between said incident face and said Bragg grating; wherein said optical waveguide comprises a core; wherein a cross section of said core is of a convex shape; and wherein the following formulas (1) to (5) are satisfied: Δλ L L n dλ dλ