Patent ID: 8478090

Claim:
An optical waveguide device comprising: an optical waveguide circuit, for outputting an optical signal which is inputted from a first input terminal to which a first waveguide is connected, and is branched into a first to a fourth optical paths, from ordered arrayed from a first to a fourth output terminals, and for outputting an optical signal which is inputted from a second input terminal to which a second waveguide is connected, and is branched into a fifth to an eighth optical paths, from ordered arrayed from a first to fourth output terminals, wherein said optical waveguide circuit comprises: an optical circuit for giving a phase difference of π, π/2, 3π/2, 0, π, π/2, 3π/2 to optical signals which travel along said second to said eighth optical paths respectively to an optical signal which transmits said first optical path; and an optical coupler for multiplexing optical signals which travel along said first to said fifth optical paths, optical signals which travel along said second to said sixth optical paths, optical signals which travel along said third to said seventh optical paths, and optical signals which travel along said fourth to said eighth optical paths respectively, and outputting to said first to said fourth output terminals respectively; and wherein said optical waveguide circuit is arranged in order to have said first to said fourth output terminals of each circuit to be arrayed as mentioned above; and said first and said second waveguides do not cross until an optical signal is inputted to said first and said second input terminals.