Abstract

A small-signal analysis of all-optical switches based on a single semiconductor optical amplifier followed by an optical filter is presented. Using the asymmetric Mach–Zehnder interferometer, which is the filter employed in the delayed-interference signal converter, as an example, we explain the principle of modulation bandwidth enhancement using optical filtering. We obtain analytical expressions for the optimum phase bias of the Mach–Zehnder interferometer filter and the resulting optical modulation bandwidth. By adopting a spectral approach, where the small-signal modulated field envelope is analyzed, we are able to generalize these results and calculate the bandwidth enhancement provided by an arbitrary filter.

© 2004 Optical Society of America

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