OPTICAL SIGNAL MEASURING CIRCUIT

摘要

PROBLEM TO BE SOLVED: To provide an optical signal measuring circuit, having a small size and using a small number of signal outputting terminals. SOLUTION: This optical signal measuring circuit is obtained by forming, in batch an arrayed waveguide diffraction grating composed of slab waveguides 102 and 104, an arrayed waveguide 103, an optical waveguide 105, etc., which change the outputting position of an inputted optical signal 1 according to the wavelength of the signal 1, and a light-receiving device 110, which outputs electric signals from a pair of output electrodes 113 and 114 at a different ratio on the same semiconductor substrate 100.