| 摘要 |
Provided is an optical wavelength multi/demultiplexer having transmission characteristics with a higher rectangular degree than a conventional one. An example (1100) of a two-stage lattice circuit including an optical wavelength multi/demultiplexer according to the present invention includes an input waveguide (1101), a third optical coupler (1102), a third arm waveguide (1103), a fourth arm waveguide (1104), a second optical coupler (1105), a first arm waveguide (1106), a second arm waveguide (1107), a first optical coupler (1108), and output waveguides (1109). The optical path length difference between the third and fourth arm waveguides and the optical path length difference between the first and second arm waveguides are designed to be ”L. The path passing through the third and first arm waveguides has an optical path length difference of 2€¢”L from the path passing through the fourth and second arm waveguides. The path passing through the third and second arm waveguides or the path passing through the fourth and first arm waveguides has an optical path length difference of ”L from the path passing through the fourth and second arm waveguides. |
