Title :
Dynamic range of an optical amplifier cascade in an ASK system with significant phase noise
Author :
Farré, J. ; Bødtker, E. ; Jacobsen, G. ; Stubkjaer, K.E.
Author_Institution :
TFL-Telecommun. Res. Lab., Horsholm, Denmark
Abstract :
The authors present detailed results concerning the dynamic range of an amplitude-shift keyed (ASK) heterodyne optical communication system where the transmitted signal is impaired by significant amounts of laser phase noise. Theoretical results are evaluated for a system with up to ten in-line optical amplifiers and a significant influence of the laser phase noise is found for the maximum allowable transmission span and the dynamic range. With ten amplifiers, a linewidth of 11% of the bit rate causes the span to be reduced by 12.2 dB and the dynamic range to be reduced by 5.7 dB. The results have been confirmed using two amplifiers in a field trial experiment at a bit rate of 636 Mb/s with an IF linewidth of 70 MHz.<>
Keywords :
amplitude shift keying; erbium; fibre lasers; noise; optical communication equipment; optical links; optical modulation; 636 Mbit/s; ASK system; EDFA; Er-doped fibre amplifiers; IF linewidth; amplitude-shift keyed; bit rate; dynamic range; field trial experiment; heterodyne optical communication system; in-line optical amplifiers; laser phase noise; maximum allowable transmission span; optical amplifier cascade; transmitted signal; Amplitude shift keying; Dynamic range; Laser noise; Laser theory; Optical amplifiers; Optical mixing; Optical noise; Phase noise; Semiconductor optical amplifiers; Stimulated emission;
Journal_Title :
Photonics Technology Letters, IEEE
