Optical multiplexer/demultiplexer

摘要

The present invention relates to an optical multiplexer/demultiplexer having a structure for actively compensating for distortion due to aberration of wavelength characteristics or the like among signal channels and effectively reducing loss variation or the like. In the optical multiplexer/demultiplexer, optical input ends of output waveguides arrayed corresponding to signals of channel wavelengths set at predetermined wavelength intervals are arranged so that an optical input end of at least either one of these output waveguides is located inside a Rowland circle. This structure effectively reduces the loss variation etc. among the signal channels.