WAVELENGTH-SELECTIVE OPTICAL-SWITCH DEVICE AND METHOD FOR CONTROLLING WAVELENGTH-SELECTIVE OPTICAL-SWITCH DEVICE

摘要

This wavelength-selective optical-switch device is provided with the following: one or more light-input/output ports for the input and output of light; a collimator lens provided for each port; a spatial modulator that has a plurality of phase-modulation elements arrayed in two dimensions and reflects inputted light, outputting same towards one of the ports; a focusing lens system that is positioned between the light-input/output ports and the spatial modulator and optically couples same to each other; anamorphic optics that are positioned between the light-input/output ports and the focusing lens system and increase the diameters of inputted light beams in a beam-diameter-increase direction; and a wavelength-dispersive element provided between the anamorphic optics and the focusing lens system. The spatial modulator is positioned at the beam-waist location of the focusing optics with respect to the direction of the wavelength-dispersion axis of the wavelength-dispersive element and produces Fresnel-lens-like phase modulation in the direction of the axis of the switch such that first-order diffracted light resulting from said phase modulation couples to the desired output port. A wavelength-selective optical-switch device that exhibits good cross-talk characteristics is thus provided.