Recently we designed and developed miniaturized external cavity semiconductor lasers which have been used to demonstrate for the first time, we believe, a coherent transmission system working over optical fiber installed in an operational communications network.1 The lasers provide the narrow spectral linewidth and electrical tunability which are required by phase shift keyed (PSK) and differentially phase shift keyed (DPSK) heterodyne systems and have allowed coherent field system operation at 565 Mbit/s with a bit error rate of <1 in 1013.

© 1989 Optical Society of America

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