1 October 1991 Eight-Gb/s QPSK-SCM over a coherent detection optical link
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The first 8 Gb/s coherent optical detection system using two closely spaced subcarriers with 4 Gb/s QPSK on each subcarrier while maintaining an RF bandwidth efficiency of 1 bit/sec/Hz is reported. The receiver sensitivity is -26.5 dBm, with less than 0.5 dB penalty due to the other channel. It is expected that these techniques can be extended to transmit 16 Gb/s while using only 2 Gb/s baseband electronics.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Paul M. Hill, Paul M. Hill, Robert Olshansky, Robert Olshansky, "Eight-Gb/s QPSK-SCM over a coherent detection optical link", Proc. SPIE 1579, Advanced Fiber Communications Technologies, (1 October 1991); doi: 10.1117/12.50153; https://doi.org/10.1117/12.50153

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