| 摘要 |
An optical multiplexer/demultiplexer has: a substrate having a principal surface on which the optical multiplexer/demultiplexer is formed; a first waveguide unit having a plurality of first waveguides; a first slab waveguide connected to the first waveguide unit; an arrayed waveguide grating having one end connected to the first slab waveguide, the arrayed waveguide grating including a plurality of arrayed waveguides each having a core section, the core section being a serial connection of a plurality of core regions having a different refraction index, and ratios of lengths of the plurality of core regions having a different refraction index being adjusted so that an optical path length of each of the plurality of arrayed waveguides becomes approximately equal; a second slab waveguide connected to another end of the arrayed waveguide grating; and a second waveguide unit connected to the second slab waveguide and having a plurality of second waveguides. An arrayed waveguide grating type optical multiplexer/demultiplexer can be made compact.
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