All-fiber filter for efficient dispersion compensation.
A dispersive filter is proposed that is based on the coupling, with a chirped periodic perturbation, of two copropagating waveguide modes that have different group velocities. Numerical calculations show that a nearly constant dispersion can be obtained over the filter bandwidth. Pulse recompression by a factor of 10 or more is possible. The filter could be made with photoinduced refractive-index gratings in optical filters.
Université Laval, Centre d'Optique, Photonique et Lasers, Département de génie électrique, Québec, Canada GIK 7P4.
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