Patent ID: 6810179
Filing Date: 2004-10-26
Classification: G02B

Abstract:
A variable dispersion compensator comprising:an optical waveguide comprising a chirped grating having a Bragg wavelength changing along a longitudinal direction of the grating; and a temperature controller that controls the temperature of the grating, wherein temperature distribution having a first function T1(x) of a distance x is applied to a central portion of the grating, the central portion being defined as a region where the distance x from an end of the grating is a range of 20% to 80% of total length of the grating along the longitudinal direction, temperature distribution having second and third functions T2(x) and T3(x) of the distance x are applied to both end portions of the grating, the end portions being defined as two regions extending from respective ends of the grating to the central portion, and at least one of the second and third functions T2(x) and T3(x) has distance dependence different from that of the first function T1(x).