Abstract
Semiconductor optical amplifiers (SOAs) will likely be used in future optical communications systems. For many applications an ideal travelling-wave amplifier, with negligible gain ripple arising from Fabry-Perot resonances, is desired. This requires very low modal reflectivities. For discrete SOA chips, facet reflectivities near 1 × 10-1 have been obtained using precision anti reflection coatings, angled waveguides, flared-output waveguides, window structures,1 and combinations of these.2
© 1993 Optical Society of America
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