Patent ID: 9331454
Filing Date: 2016-05-03
CPC Classification: G02B,H01S

Claim Text:
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 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; and wherein ΔλG represents a full width at half maximum of a peak of a Bragg reflectance; L L n dλ dλ said light source further comprising a reflection film provided on an end face of said active layer on the side of said grating device, wherein a reflectance of said Bragg grating is higher than that at said end face of said active layer on the side of said grating device.