WAVE-GUIDE GRATING FILTERS FOR DISPERSION COMPENSATION AND PULSE-COMPRESSION

Dispersion compensation and pulse compression is theoretically demonstrated using aperiodic waveguide gratings. The gratings are designed to have both a flat amplitude and a quadratic phase response over the pulse bandwidth. This results in nearly transform-limited compressed pulses. The appropriate waveguide grating parameters are obtained by applying the Gel'fand-Levitan-Marchenko inverse scattering method to the coupled mode equations which describe propagation. The technique is illustrated by designing an aperiodic grating, which compresses a 60 ps pulse by a factor of three. Limitations and possible extensions of the general method are discussed.