Abstract
The use of subcarrier multiplexing1-6 (SCM) is attractive for the optical transmission of multi-Gbit/s signals. As previously demonstrated, BPSK5 can be used at 2 Gbit/s, and QPSK6,7 can be used at 2-4 Gbit/s for the transmission of data on a single microwave subcarrier. In these reports, the noise bandwidth, linearity, and baseband electronics limited the potential receiver sensitivity.
© 1990 Optical Society of America
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