| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical wavelength multiplexer/demultiplexer and an optical transmission module that have a high diffraction efficiency in a desired wavelength range and that can reduce change in characteristic caused by polarization. SOLUTION: The demultiplexer 10 is equipped with a light incident part 12 on which a signal light L1 is made incident, a diffraction grating 13 which diffracts the signal light L1 made incident from the light incident part 12, and a light receiving part 14 which has a plurality of photodetectors for detecting diffracted signal light L2. In this demultiplexer 10, in a prescribed wavelength range, the difference of diffraction efficiency between the TE polarization and TM polarization of the diffraction grating 13 is made smaller on the short wavelength side and larger on the long wavelength side. COPYRIGHT: (C)2006,JPO&NCIPI |
