Title :
Four-level heterodyne video systems: a comparison of DQPSK and 4-FSK
Author :
Gross, Richard ; Enning, Bernhard ; Olshansky, Robert
Author_Institution :
GTE Labs. Inc., Waltham, MA, USA
fDate :
3/1/1992 12:00:00 AM
Abstract :
Experimental implementation of four-level heterodyne video systems using 4-ary FSK (frequency shift keying) are described and compared to DQPSK (differential quadrature phase-shift keying). The results show that the receiver sensitivity and complexity of the two systems are very similar. However, DQPSK provides a much higher spectral efficiency and is therefore preferable for video distribution systems.<>
Keywords :
frequency shift keying; optical links; phase shift keying; video signals; visual communication; 4-FSK; DQPSK; complexity; differential quadrature phase-shift keying; four-level heterodyne video systems; frequency shift keying; receiver sensitivity; spectral efficiency; video distribution systems; Bandwidth; Frequency shift keying; Optical mixing; Optical pumping; Optical receivers; Optical sensors; Optical transmitters; Phase modulation; Stimulated emission; Voltage-controlled oscillators;
Journal_Title :
Photonics Technology Letters, IEEE
