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8 Gb/s subcarrier multiplexed coherent lightwave system

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2 Author(s)
Hill, P.M. ; GTE Lab. Inc., Waltham, MA, USA ; Olshansky, R.

The authors describe the first wideband coherent detection optical communications systems using two microwave subcarriers to transmit 8 Gb/s with an RF bandwidth efficiency of 1 b/s/Hz. It is demonstrated that two subcarriers each carrying 4 Gb/s QPSK (quadrature phase shift keying), compactly spaced at just twice the data rate, can achieve a receiver sensitivity ( eta P) of -26.5 dBm with as little as 0.5 dB crosstalk between subcarriers. The results are within 11 dB of the shot noise limit.<>

Published in:

Photonics Technology Letters, IEEE  (Volume:3 ,  Issue: 8 )