Optical spectrum shaper and optical signal monitor using same

An optical spectral shaper, comprising:

• a plurality of input fibers that input signal lights;
• a plurality of output fibers that output the signal lights;
• an optical waveguide front end that includes an input side waveguide portion which emits each signal light at a different angle while expanding a beam diameter of the signal light emitted from each of the plurality of input fibers respectively, and an output side waveguide portion that wave-guides each of the inputted signal lights and couples the signal lights with the plurality of output fibers respectively;
• a spatial light modulator that includes a plurality of pixels which are arrayed on a plane in a matrix and a drive unit that drives the plurality of pixels, and that changes the phase of each inputted signal light by the drive unit controlling the phase patterns of the plurality of pixels, and emits the signal light, and the spatial light modulator in which a specific phase pattern is set for each pixel region to which each signal light enters;
• and
• an optical element group that is disposed so that each of the signal lights emitted from the input side waveguide portion of the optical waveguide front end is collected at a different pixel position on the spatial light modulator, and the optical element group that is disposed so as to couple the light emitted from the spatial light modulator with the output side waveguide portion of the optical waveguide front end.