Optical intensity-to-phase converter, mach-zehnder interferometer, optical A/D converter, and method of constructing optical intensity-to-phase converter

An optical intensity-to-phase converter comprising:nfirst and second waveguides, a first input light being input to the first and second waveguides;a third waveguide, a second input light being input to the third waveguide;a first interaction region that is provided in common on the second and third waveguides, the first and second input lights being multiplexed and interacting in the interaction region; anda second interaction region that is provided on the first waveguide, with the same size as that of the first interaction region, the first input light being input to the second interaction region and the second input light not being input to the second interaction region,wherein the optical intensity-to-phase converter provides delay to output lights output from the first and second waveguides based on intensity of the first or second input light.

A construction method of an optical intensity-to-phase converter comprising:nproviding first and second waveguides, a first input light being input to the first and second waveguides;providing a third waveguide, a second input light being input to the third waveguide;providing a first interaction region in common to the second and third waveguides, the first and second input lights being multiplexed and interacting in the interaction region;providing a second interaction region on the first waveguide, with the same size as that of the first interaction region, the first input light being input to the second interaction region and the second input light not being input to the second interaction region; andproviding delay to output lights output from the first and second waveguides based on intensity of the first or second input light.