P. Wan et J. Conradi, DOUBLE RAYLEIGH BACKSCATTERING IN LONG-HAUL TRANSMISSION-SYSTEMS EMPLOYING DISTRIBUTED AND LUMPED FIBER AMPLIFIERS, Electronics Letters, 31(5), 1995, pp. 383-384
Double Rayleigh backscattering in long-haul transmission systems emplo
ying 'lumped' and distributed fibre amplifiers has been analysed. We f
ind that, for singlemode fibre employing 'lumped' erbium-doped fibre a
mplifiers (EDFAs) with isolators on both sides of the EBFAs, the degra
dation is very small; however, for systems using 'lumped' praseodymium
-doped fluoride fibre amplifiers or distributed EDFAs the power penalt
ies can be large.