Abstract

Application of broadband distributed Raman amplification in low PMD fibre can reduce transmission system cost, increase the amplification bandwidth, and extend the link span in the case of suppression huge polarization dependent gain which is the main transmission impairment for low PMD fibre Raman amplifiers (FRAs) [1, 2]. Sergeyev et al. have recently showed that it is possible to suppress PDG and PMD from 22 dB and 0.1 ps·km^−1/2 to 0.13 dB and 0.032 ps·km^−1/2 correspondently with help of the two-section fibre where the first section has no spin and the second one is periodically spun [3]. To suppress PMD further down to 0.007 ps·km^−1/2, we report herein a novel approach to optimize parameters for the first section of fibre, namely the length and PMD. In addition, we calculate the PDG for the case of periodically spun fibre as a function of pump light degree of polarization (DOP). The low value of pump DOP can be provided with the help of depolarizer or polarization multiplexing of pump laser diodes.

© 2009 IEEE