Patent ID: 6980718

Claim:
A coupling structural body of optical parts, constructed by arranging a first optical waveguide in which an underlying cladding layer with a refractive index nuj, a core layer with a refractive index ncj, and an overlying cladding layer with a refractive index noj are laminated, and a second optical waveguide in which an underlying cladding layer with a refractive index nuk, a core layer with a refractive index nck, and an overlying cladding layer with a refractive index nok are laminated, are arranged to oppose end surfaces, from which the overlying cladding layer to the underlying cladding layer are exposed, to each other, and then filling a portion between mutual end surfaces with a filling medium with a refractive index ni(j,k), whereby at least one end surface of both end surfaces is formed as a two-dimensional lens and a light propagates from one optical waveguide to other optical waveguide through the filling medium.