| 摘要 |
<p>PROBLEM TO BE SOLVED: To align an input and output part for light, or the like, with high accuracy in a wavelength selection switch in which optical axes of incident and exiting light in input and output ports for light are inclined.SOLUTION: A wavelength selection switch includes an input and output part 10 for light, a spectral element, and a light-deflecting element, arranged on a predetermined axial line C. The input and output part 10 for light includes: input and output ports 11, 12 for light, allowing light to be incident and exiting with an optical axis inclined with respect to the predetermined axial line C; and an aligning port 13 allowing light L3 for alignment to be incident and exiting with an optical axis along the predetermined axial line C.</p> |
