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Eight-Gbit/s quadrature-PSK optical homodyne detection experiment using external cavity laser diodes

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Quandrature-phase-shift keying (QPSK) homodyne detection system can double the system bit rate without increasing the electric circuits bandwidth. Moreover, we can get a more compact spectrum at the same system bit rate than is possible with binary modulation. However, QPSK optical homodyne receiver has a 3-dB worse sensitivity than a binary-phase-shift keying receiver,1 and requires very narrow linewidth lasers or short loop delay times.2 The only reported QPSK optical homodyne detection experiment used two gas lasers,3 whose linewidths were very narrow. However, the use of solitary laser diodes as light sources is expected in future systems because of their reliability and compactness. This paper reports what we believe to be the first demonstration of QPSK homodyne detection with external cavity laser diodes and measured bit error rate (BER) performance.

© 1992 Optical Society of America

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