低泵浦功率的遥泵放大在超长跨距密集波分复用系统中的应用

针对长跨距密集波分复用系统中喇曼放大入纤泵浦功率过大的问题，将遥泵放大器（RP-EDFA）引入到系统中，通过对共纤RP-EDFA的噪音性能及其优化设计的研究，在理论上计算比较了RP-EDFA系统和后向喇曼放大系统在不同泵浦功率水平下的光信噪比和非线性相移，表明遥泵放大技术有效降低了入纤泵浦的功率水平，更适合长跨距应用.运用遥泵放大技术，对一个典型的长跨距系统进行系统Q值的模拟，结果表明：在 220 mW泵浦功率水平下可以实现跨距为 167 km的40×11.6 Gbit/s系统1000 km传输，Q值裕量4.4 dB.

Remotely Pumped Erbium Doped Fiber Amplifiers Using Low Power Pump in Ultra-long Span Dense Wavelength Division Multiplexing Systems

To overcome the high pump power of Raman amplification the remotely pumped erbium doped fiber amplifiers (RP-EDFA) are introduced in ultra-long haul dense wavelength division multiplexing (DWDM) systems. Firstly,the noise performance of a simple co-fiber RP-EDFA is investigated experimentally and theoretically,then the design method is discussed. The OSNRs and nonlinear phase shifts of typical systems based on RP-EDFA and backward pumped Raman amplification are compared theoretically,showing that RP-EDFA can efficiently reduce pump power and is appropriate for the ultralong span application. Finally,Q value of the typical transmission system is simulated. The results show that using RP-EDFA pumped by only 220 mW,1000 km transmission of a 40×11.6Gbit/s system with a span distance of 167 km can be achieved,with 4.4 dB margin of Q value.