Hybrid optical waveguide circuit chip, and method for predicting the characteristics thereof

A hybrid optical waveguide circuit chip comprising an optical element incorporating portion in which optical elements are incorporated, and a first optical waveguide circuit optically connected to said optical elements,

• wherein one end face of the first optical waveguide circuit is terminated at one chip end face of the hybrid optical waveguide circuit chip, the other end face of the first optical waveguide circuit is terminated at the respective end faces of the optical waveguide layers at the boundary portion at the surrounding area of the optical element incorporating portion, a second optical waveguide circuit for measuring predetermined optical characteristics is disposed adjacent to said first optical waveguide circuit, one end face of said second optical waveguide circuit is terminated at one chip end face of the hybrid optical waveguide circuit chip, at least one of the optical waveguide end faces at the other end face of said second optical waveguide circuit is terminated at the other chip end face of the hybrid optical waveguide circuit chip, and portions to determine the predetermined optical characteristics of both the first optical waveguide circuit and the second optical waveguide circuit are formed to have substantially the same shape.