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Comparison of different Raman amplification schemes in long-span fiber transmission systems with double Rayleigh backscattering

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3 Author(s)
Zhi Tong ; Inst. of Lightwave Technol., Northern Jiaotong Univ., Beijing, China ; Huai Wei ; Shuisheng Jian

In this letter, three Raman amplification configurations, which are bidirectional pumping scheme, backward pumping with mid-way isolators, and Raman plus erbium-doped fiber amplifier hybrid amplification, respectively, are optimized and compared in long-span (> 120 km) transmission systems including the impacts of double Rayleigh backscattering (DRB). Numerical results show that a balanced bidirectional pumping scheme can achieve the best performance for most practical conditions at identical nonlinearity. However, hybrid amplification will be a better choice when DRB noise is overwhelming.

Published in:

Photonics Technology Letters, IEEE  (Volume:15 ,  Issue: 12 )