Patent ID: 7712977

Claim:
An optical resonator comprising: resonance means formed by using an incidence side reflection film and an emission side reflection film arranged in parallel with each other and adapted to resonate light entering it by way of the incidence side reflection film; an optical waveguide formed so as to run through from the incidence side reflection film to the emission side reflection film and adapted to propagate light resonated by the resonance means; a substrate for forming the optical waveguide on the top surface thereof; and end facet protection means formed by respective members corresponding to the material of the substrate and provided at an upper part of the waveguide so as to make at least an end facet of each of the members share a plane with a first end facet or a second end facet, whichever appropriate, of the substrate including a light incidence end or a light emission end, whichever appropriate, of the optical waveguide and the shared planes substantially perpendicular relative to the optical waveguide, the incidence side reflection film and the emission side reflection film being laid respectively on the shared planes.