4-ary FSK coherent optical communication system

16 August 1990

journal article
Published by Institution of Engineering and Technology (IET) in Electronics Letters

Vol. 26 (17) , 1346-1348
https://doi.org/10.1049/el:19900867

Abstract

Experimental verification of the sensitivity advantage of M-ary orthogonal signalling over binary signalling is reported. A 110 Mbits 4-ary FSK system using conventional Fabry–Perot lasers with a 7% IF linewidth to data-rate ratio has achieved a sensitivity of 37 detected photons per bit at a 10⁻⁹ bit error rate. This exceeds the performance possible using ideal binary orthogonal FSK with zero linewidth lasers.

Keywords

BIT ERROR RATE
110 MBIT/S
SENSITIVITY ADVANTAGE
FABRY-PEROT LASERS
4-ARY FSK SYSTEM
IF LINEWIDTH TO DATA-RATE RATIO
COHERENT OPTICAL COMMUNICATION SYSTEM
M-ARY ORTHOGONAL SIGNALLING

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