Patent ID: 8472489

Claim:
A light emitting device comprising a ring optical resonator laminated on a substrate, wherein the optical resonator comprises: a core that is made of a semiconductor through which light propagates; and a cladding that is laminated on at least the substrate side in the substrate side of a lamination direction with respect to the core and a side opposite the substrate side, at least a ring inner circumference side and a ring outer circumference side of the core are covered with a space or a transparent body whose refractive index is lower than that of the cladding, a ring inner circumference side and a ring outer circumference side of the cladding are partially covered with the space or the transparent body whose refractive index is lower than that of the cladding; and in the cladding in a direction parallel to the substrate surface, a width on a side opposite from the core is narrower than a width on the core side.