Title :
4-ary FSK coherent optical communication system
Author :
Alexander, S.B. ; Barry, R. ; Castagnozzi, D.M. ; Chan, V.W.S. ; Hodsdon, D.M. ; Jeromin, L.L. ; Kaufmann, J.E. ; Materna, D.M. ; Parr, R.J. ; Stevens, M.L. ; White, D.W.
Author_Institution :
MIT Lincoln Lab., Lexington, MA, USA
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 :
frequency shift keying; optical communication equipment; optical modulation; sensitivity; 110 Mbit/s; 4-ary FSK system; Fabry-Perot lasers; IF linewidth to data-rate ratio; M-ary orthogonal signalling; bit error rate; coherent optical communication system; sensitivity advantage;
Journal_Title :
Electronics Letters
DOI :
10.1049/el:19900867
