Light waveguide and its manufacturing method

摘要

When forming a laminated optical waveguide, an extra adhesive layer lies and a wave-guiding mode is present. Moreover, it is difficult to remove the adhesive layer. A first substrate 11 on which an optical-waveguide groove is formed and a second substrate 13 are used, the second substrate 13 is bonded to the plane of the first substrate 11 on which the optical-waveguide groove is formed by a material 12 having a refractive index higher than those of the first substrate 11 and second substrate 13, the optical-waveguide groove is filled with the material 12, and the refractive index of the first substrate 11 is different from the refractive index of the second substrate 13.