Title :
Bandwidth efficient transmission of 4 Gb/s on two microwave QPSK subcarriers over a 48 km optical link
Author :
Hill, Paul ; Olshansky, Robert
Author_Institution :
GTE Lab. Inc., Waltham, MA, USA
fDate :
7/1/1990 12:00:00 AM
Abstract :
The use of two quadrature phase shift keying (QPSK)-modulated subcarriers over a wideband direct detection optical communications system with a RF bandwidth efficiency of 1 b/s/Hz is reported. It is shown that two subcarriers each carrying 2 Gb/s QPSK, compactly spaced at just twice the data rate, can achieve a receiver sensitivity of -19.5 dBm over 48 km without crosstalk between subcarriers. This represents a receiver sensitivity improvement of 5 dB over a 4-Gb/s single QPSK subcarrier system.<>
Keywords :
optical links; optical modulation; phase shift keying; receivers; sensitivity; 4 Gbit/s; 48 km; RF bandwidth efficiency; data rate; microwave QPSK subcarriers; optical link; quadrature phase shift keying; receiver sensitivity; wideband direct detection optical communications system; Bandwidth; FETs; Intensity modulation; Optical fiber communication; Optical modulation; Optical receivers; Optical sensors; Quadrature phase shift keying; Stimulated emission; Time division multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
