Wavelength selective optical switch device and method of controlling wavelength selective optical switch device

摘要

The wavelength selective optical switch device includes one or more optical input / output ports for inputting / outputting light, a collimator lens provided corresponding to each port, and a reflector for reflecting the input light and outputting the light toward either port A spatial modulator having a plurality of two-dimensionally arrayed phase modulation elements, a condenser lens system arranged between the light input / output port and the spatial modulator to optically couple them, optical input / output An anamorphic optical system which is disposed between the port and the condenser lens system and which expands the beam diameter of the input light in the beam diameter enlargement direction, and an anamorphic optical system which is provided between the anamorphic optical system and the condenser lens system Wherein the spatial modulator is disposed at the position of the beam waist of the condensing lens system with respect to the wavelength dispersion axis direction of the wavelength dispersion element, forms a Fresnel lens-like phase modulation in the switch axis direction, The first order diffracted light by the phase modulation is coupled to a desired output port. Thereby, a wavelength selective optical switch device having good crosstalk characteristics is provided.