Patent ID: 7424182
Filing Date: 2008-09-09
Classification: G01J,G02B

Abstract:
1. A wavelength selection switch comprising: a diffraction grating that spectrally separates entering light; a focusing optical system that receives band-like beams spectrally separated from the light by the diffraction grating and focuses each of the band-like beams at predetermined positions; a deflection member that is arranged at the predetermined position and includes deflection elements that respectively deflect the spectrally separated band-like beams entering through the focusing optical system; a base on which the diffraction grating, the focusing optical system, and the deflection member are mounted; and a deflection member position adjusting member that is mounted on the base and adjusts a position of the deflection member with respect to one of the diffraction grating and the focusing optical system when adjusting assembly of the wavelength selection switch, the deflection member position adjustment member including a positioning member that determines a reference position of the deflection member in a direction of spectral separation, the direction being where focal points of band-like beams spectrally separated by the diffraction grating are lined up, and a guide member that enables the deflection member to move along in the direction of spectral separation, the deflection member position adjustment member positions the spectrally separated band-like beams respectively on the deflection elements by moving the deflection member along the guide member and positioning the deflection member by a positioning member to where the optical characteristics of the reflection light from deflection elements become optimal.