Waveguide-type optical signal processing circuit

摘要

It is an object of the present invention to reduce the size of a circuit and the adverse effects of fabrication errors, while increasing yield. Signal light incident on a circuit through input waveguides (303) propagates from the exterior to interior of the circuit while rotating counterclockwise. The signal light passes through a point of inflection (305) in the center of the circuit, subsequently propagate clockwise from the interior to exterior of the circuit, and then exit output waveguides (304). Two arms constituting a delay circuit (302a-302d) and optical couplers (301a-301e) can be integrated together at such an interval that they are not coupled together. Therefore, the size of the circuit can be reduced compared to the prior art.