Wavelength selective switch

A wavelength selective switch including a substrate,

• wherein, on the substrate, the wavelength selective switch comprising:
• at least one input port from which,
• wavelength-multiplexed light is made to be incident in the wavelength selective switch,
• a dispersive element which receives the light from the input port, and disperses the light,
• a light condenser element which converges light for each wavelength which has been dispersed by the light dispersive element,
• a light deflecting member including a plurality of deflecting elements, which is capable of deflecting light for each wavelength from the light condenser element, independently for each wavelength,
• an output port which receives light for each wavelength which has been deflected by the light deflecting member, and
• a driving mechanism which drives at least one of the dispersive element, the light condenser element, and the light deflecting member, and
• wherein drive by the driving mechanism is a rotational drive around an axis perpendicular to the substrate, for the dispersive element, and is a translational drive in a direction of dispersion of wavelength with respect to the substrate, for the light condenser element or the light deflecting member.