Tong Zhi, Wei Huai, Jian Shuisheng
Opt Express. 2004 May 3;12(9):1794-802. doi: 10.1364/opex.12.001794.
A theoretical investigation of bidirectionally dual-order pumped distributed Raman amplifiers is presented in detail, and comparisons with other Raman amplification schemes, i.e., bidirectional first-order pumping and Raman-plus-erbium-doped fiber hybrid amplification, are carried out, for the first time to the authors' knowledge, at identical nonlinear phase shifts. The results show that symmetric bidirectional dual-order pumping can achieve the best optical signal-to-noise ratio performance by appropriate choice of the second-order pump wavelength and second-to-first-order pump power ratio for both short- and long-span conditions, which will be helpful for designing long-haul transmission systems.
详细介绍了双向双阶泵浦分布拉曼放大器的理论研究，并在作者所知范围内首次在相同非线性相移条件下，与其他拉曼放大方案（即双向一阶泵浦和拉曼加掺铒光纤混合放大）进行了比较。结果表明，对于短距离和长距离传输条件，通过适当选择二阶泵浦波长和二阶与一阶泵浦功率比，对称双向双阶泵浦可实现最佳的光信噪比性能，这将有助于设计长距离传输系统。
