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同时考虑接收光信噪比(OSNR)及非线性失真影响,对分布式光纤拉曼放大器在长距离光传输系统中的最优抽运方式进行了研究.利用变分法原理获得了在不记双瑞利背散射(DRB)影响时的最优信号功率分布函数———均匀分布,但考虑双瑞利散射影响时则不存在解析的最优分布函数.在分别考虑长、短光纤跨距的情况下,比较了三种具有代表性的分布式光纤拉曼放大方式,即双向二阶拉曼抽运、双向一阶拉曼抽运和拉曼+掺铒光纤放大器混合放大方式的性能.指出通过优化一阶抽运波长以及一阶到二阶抽运功率比,对称结构的双向二阶抽运在绝大部分情况下可以在相同的非线性条件下获得更优的OSNR性能,但当DRB影响非常大时,混合放大结构将具有更好的性能.
At the same time, considering the effect of received optical signal-to-noise ratio (OSNR) and nonlinear distortion, the optimal pumping mode of distributed fiber Raman amplifier in long-distance optical transmission system is studied.With variational principle, The optimal signal power distribution function when the double Rayleigh backscattering (DRB) is affected is uniformly distributed, but the analytic optimal distribution function does not exist when the double Rayleigh scattering effect is considered.When considering the short and long fiber spans , The performance comparison of three representative distributed fiber Raman amplification methods, such as bi-directional second-order Raman pumping, bi-directional first-order Raman pumping and Raman + erbium-doped fiber amplifier amplifier amplification, is compared. It is pointed out that by optimizing the first-order pumping wavelength and the first-order to second-order pumping power ratio, the bidirectional second-order pumping of the symmetrical structure can obtain better OSNR performance under the same non-linearity condition in most cases, DRB is very large impact, the hybrid amplifier structure will have better performance.