| 摘要 |
PROBLEM TO BE SOLVED: To provide a low reflective optical demultiplexer.SOLUTION: An optical demultiplexer 100 has an input port P21 and output ports P31, P32. An optical path length LX1 from the input port P21 to the output port P31 is different from an optical path length LX2 from the input port P21 to the output port P32. The optical path length LX1 and the optical path length LX2 are set such that the intensity of light reflected on an emission end face 10b and propagating toward the input port P21 is smaller than the intensity of the reflected light in the case where the optical path length LX1 is same as the optical path length LX2. |
