Title :
8 Gb/s subcarrier multiplexed coherent lightwave system
Author :
Hill, Paul M. ; Olshansky, Robert
Author_Institution :
GTE Lab. Inc., Waltham, MA, USA
Abstract :
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.<>
Keywords :
light coherence; optical links; phase shift keying; 8 Gbit/s; RF bandwidth efficiency; microwave subcarriers; quadrature phase shift keying; receiver sensitivity; shot noise limit; subcarrier multiplexed coherent lightwave system; wideband coherent detection optical communications systems; Bandwidth; Optical crosstalk; Optical fiber communication; Optical filters; Optical mixing; Optical receivers; Optical transmitters; Phase modulation; Quadrature phase shift keying; Wavelength division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
