| 摘要 |
PROBLEM TO BE SOLVED: To obtain the device which has small polarization dependent loss in a light signal path and a small amount of an adhesive in the light signal path by allowing an optical port, a filter element and a reflecting element to cooperatively prescribed part of a multipoint zigzag optical path by passing through an optical gap. SOLUTION: The optical port, filter element and reflecting element cooperatively prescribe part of the multipoint zigzag optical path by passing through the optical gap. For example, the selective reflecting filter element of at least one of channel ports 18 and 42 is fixed to a reflecting element like an optical block 2 and a wide-band reflector extending to one optical gap of a parallel flank. A 2nd channel port and/or the selective reflecting filter element of the other reflecting element are fixed to an optical block 2 extending to the optical gap of the parallel flank on the opposite side. The multipoint zigzag optical path is established in an optical block 2 like this and extends to the front and rear through the gap between the two parallel flanks. |
