In the matsuhatsuenda die optical interference guided wave

摘要

PROBLEM TO BE SOLVED: To provide an optical limiter circuit that is easily integrated with other optical function circuits and has a wide use wavelength, and to provide an optical receiving circuit.;SOLUTION: A demultiplexing waveguide 102 is connected to an input waveguide 101, a multiplexing waveguide 105 is connected to an output waveguide 106, and a first arm waveguide 103 and a second arm waveguide 104 are formed to connect those demultiplexing waveguide 102 and multiplexing waveguide 105 to each other. Thus, the optical circuit constitutes a Mach-Zehnder optical interference waveguide. Those optical circuits are composed of a semiconductor waveguide (for example, silicon Si, indium phosphate InP, gallium arsenide GaAs, etc.), and defect increasing processing by impurity doping, low-temperature growth, ion implantation, etc., is performed on the first arm waveguide 103 to increase the absorption coefficient of the first arm waveguide 103. Namely, the first arm waveguide 103 and second arm waveguide 104 have their absorption coefficients set to have a difference in absorption coefficient.;COPYRIGHT: (C)2010,JPO&INPIT