| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical multiplexer/demultiplexer which can have a wide-band wavelength characteristic such that the peak of electric field distribution is made flat. SOLUTION: In an array waveguide diffraction grating type optical multiplexer/demultiplexer 10 equipped with an input waveguide 12, a first slab waveguide 13, a channel waveguide array 14, a second slab waveguide 15, and an output waveguide 16, a couple of different-refractive-index parts 40 differing in refractive index from the slab waveguide 15 are formed nearby the border of the channel waveguide array 14 in the second slab waveguide 15. The different-refractive-index parts 40 project in an island shape from both the side parts 15a and 15b of the slab waveguide 15. Light beams which exit from respective waveguides 14a of the channel waveguide array 40 and travel toward the output waveguide 16 pass through the different-refractive-index parts 40 to form a light distribution such that the peak of electric field distribution is flattened at the border between the second slab waveguide 15 and output waveguide 16. COPYRIGHT: (C)2004,JPO |
