Title :
Narrow optical filtering in phase modulated communication links
Author :
Shapiro, E.G. ; Shapiro, D.A.
Author_Institution :
Inst. of Autom. & Electrometry, Novosibirsk, Russia
Abstract :
Two variants of differential phase-shift keying with π and π/2 shifts are compared theoretically. The expressions are derived for dispersion averaged over all the realisations of the bit sequence. It is shown that in the presence of strong optical filtering the π/2 scheme yields less dispersion of pulses and much better Q-factor in agreement with the experiment. The inequality is confirmed by numerical calculation.
Keywords :
Q-factor; differential phase shift keying; optical fibre communication; optical filters; phase modulation; Q-factor; bit sequence; differential phase-shift keying; optical filtering; phase modulated communication links;
Journal_Title :
Electronics Letters
DOI :
10.1049/el.2012.3625
