In recent years, semiconductor optical amplifiers (SOA) have attracted considerable attention for various signal processing applications. Wavelength conversion at 2.5-4 Gbit/s using cross gain modulation in SOAs1–3 and demultiplexing at 6 Gbit/s using a SOA electrically modulated gate4 have been demonstrated. Previously, 4-6 Gbit/ s operation was considered to be the speed limit using gain modulation induced by simple stimulated recombination. Therefore, four-wave mixing (FWM) has been exploited to achieve 20 Gbit/s wavelength conversion and optical demultiplexing.5 However, such technique suffers from inherent polarization sensitivity and poor conversion efficiency.

© 1994 Optical Society of America

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