| 摘要 |
PROBLEM TO BE SOLVED: To provide a wavelength selection switch which corrects displacement of an incident position of signal light on an optical deflector.SOLUTION: A wavelength selection switch 100 includes: an input/output unit 20; a dispersion unit 25; a light collection unit 26; a deflection unit 40; a position detection unit 43; and a displacement mechanism 44. The input/output unit 20 has a plurality of input/output sections that input or output light. The dispersion unit 25 disperses signal light and guide light inputted from the input/output unit in different directions for each of wavelengths. The light collection unit 26 collects the signal light and the guide light for each of the wavelengths. The deflection unit 40 has a plurality of optical deflectors 42 that deflects the signal light. The optical deflectors 42 are disposed so that the signal light deflected by the optical deflectors 42 are incident on the different input/output sections for each of the wavelengths. The position detection unit 43 detects incident light of the guide light. The displacement mechanism 44 relatively displaces an incident position of the signal light on the deflection unit 40 along a dispersion direction. |
