OPTICAL WAVEGUIDE ELEMENT, LIGHT-RECEIVING DEVICE, OPTICAL COMMUNICATION DEVICE, OPTICAL MODULATOR, OPTICAL RESONATOR, AND METHOD FOR MANUFACTURING OPTICAL WAVEGUIDE ELEMENT

摘要

An optical waveguide element includes a core and a cladding that is made of SiO₂. When n_{g_i_TE} is a group refractive index of a TE0 polarized wave in the i-th waveguide counted from a light incidence plane of the core and n_{g_i_TM} is a group refractive index of a TM0 polarized wave in the i-th waveguide, the length L_i[m] of the i-th waveguide satisfies a predetermined relation.