Patent ID: 8260139
Filing Date: 2012-09-04
Classification: G02B,G02F

Abstract:
1. A dispersion compensator comprising: a first dispersive element for dispersing an optical signal at an angle according to a wavelength of an input optical signal; at least one focusing lens for focusing the optical signal from the first dispersive element; and a spatial light modulator for controlling a phase of the optical signal focused with the at least one focusing lens, wherein in a direction of a first dispersion axis defined as an intersecting line between a plane of the spatial light modulator and a first dispersion plane formed by the first dispersive element, a phase distribution provided by a function expressed in a second-order or more polynomial with respect to the first dispersion axis is imparted to the optical signal by the spatial light modulator, and wherein the spatial light modulator includes a plurality of pixels to each of which a discrete phase value can be set, the plurality of pixels being repeatedly arranged in the direction of the first dispersion axis, and satisfies the following relationship, where