CHROMATIC DISPERSION COMPENSATOR

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There is provided a chromatic dispersion compensator, which includes an optical circulator optically coupled to an input port and an output port, a chromatic dispersion compensation unit; including, and a light excitation source for supplying, to a light waveguide, excitation light. The chromatic dispersion compensation unit includes a light waveguide doped with the rare earth ion, a grating unit including a grating formed in at least a part of the longitudinal direction of the light waveguide, where the grating unit performing a chromatic dispersion compensation for a signal light input via the optical circulator to a one end of the light waveguide through the input port by reflecting the signal light flowing through the light waveguide according to a wavelength of the signal light and by returning the reflected signal light to the one end to lead to the output port via the optical circulator.