Patent ID: 8208771

Claim:
An optical switch comprising: a fiber array made of n fibers that forms one or more input ports to input wavelength-multiplexed light and one or more output ports; a lens array made of n lenses each corresponding to a fiber in the fiber array; a dispersive element that disperses light output from the lens array into lights of individual wavelengths; and a deflection unit that receives the lights of individual wavelengths from the dispersive element, and selects an output port for each of the wavelengths by a plurality of deflection elements that can deflect light independently for individual wavelengths, wherein the fibers in the fiber array are arranged in a row, when a region where lights input into or output from the fibers in the fiber array intersect is taken as an intersecting position C, and an axis parallel to the fibers in the fiber array and passing through the intersecting position C is taken as a Z axis, then a distance δ between a core of a desired fiber of the fiber array and an optical axis of a corresponding lens of the lens array varies depending on a distance S of the desired fiber from the Z axis.