| 摘要 |
The present invention provides an effective-refractive-index-chirped Bragg grating comprising a tapered polymeric optical waveguide, a substrate and a Bragg grating of uniform periodicity disposed within said waveguide, said waveguide being disposed on said substrate. The present invention further provides for a method for preparing a chirped Bragg grating, the method comprising the application of a temperature gradient to a Bragg grating having uniform periodicity. The present invention further provides for an apparatus which simultaneously provides combined chromatic dispersion compensation and chromatic dispersion slope compensation comprising a uniform-period Bragg grating, a substrate, a first heater disposed between said uniform-period Bragg grating and said substrate, and a second heater disposed on a side of said chirped Bragg grating opposite to said first heater, one of said heaters comprising an essentially parabolic shape (in width or thickness) and the other of said heaters providing an essentially trapezoidal profile (in width or thickness), said heaters being disposed such that upon activation to provide heat, both a parabolic temperature profile and a linear temperature profile will be superposed upon said uniform-period Bragg grating. |
