摘要
【目的】针对C+L波段大容量超长跨距传输系统结构复杂,实现难度大的问题,文章设计了一种同时放大C和L波段的远程增益单元(RGU)。【方法】文章通过研究掺铒光纤(EDF)对光信号放大的理论,得出EDF长度与RGU的增益以及噪声系数的关系。再通过模拟仿真,比较不同设计方案下RGU的增益与噪声系数,选出RGU中C和L波段最佳的EDF长度,并通过优化光路子系统参数,设计出在实际应用场景下,基于远程光泵放大器(ROPA)系统性能最优的C+L波段RGU。文章还搭建了基于后向RGU的单载波400 Gbit/s速率C+L超大容量长跨距无中继传输系统进行了实验验证。【结果】实验采用前向高阶拉曼放大技术与高阶泵浦结合后向ROPA放大技术,实现了36 Tbit/s(90×400 Gbit/s)无中继传输342.5 km的最新记录。【结论】结果表明,实验测试的C+L波段RGU的增益与噪声系数与模拟仿真数据结果高度一致,即这种远程增益结构下C波段17 m与L波段21 m EDF的设计符合理论研究。实验系统的传输记录说明了基于理论研究设计的C+L波段RGU在无中继大容量传输系统中的可行性,并且其能大幅提高C+L波段传输系统的传输距离。文章取得了有实际意义的结果,为我国大容量超长距离(ULH)系统在信号波段的拓展方向的应用提供了系统的性能、指标、参数和标准等实验依据。
【Objective】In order to solve the problem of complex and difficult implementation of large capacity and ultra-long haul transmission system in C+L band,a Remote Gain Unit(RGU)is designed to amplify both C and L bands.【Methods】The article examines the theory of optical signal amplification by Erbium-Doped Fiber(EDF)and derives the relationship between the length of EDF and the gain as well as the noise figure of the RGU.Then,through simulation,the gain and noise factor of the RGU under different design schemes are compared.The best EDF length of C and L bands in RGU is selected,and the optimal performance of the C+L band RGU based on the Remote Optical Pump Amplifier(ROPA)system is designed by optimizing the parameters of the optical path sub-system.The article also reports on the experimental verification of a single-carrier 400 Gbit/s ultra-large capacity long-span unrepeatered transmission system based on a backward RGU,operating in the C+L bands.【Results】A new record of 36 Tbit/s(90×400 Gbit/s)repeaterless transmission of 342.5 km is achieved in the experiment by using forward high-order Raman amplification technology and high-order pump combined with backward ROPA amplification technology.【Conclusion】The results show that the gain and noise factor of the experimental C+L band RGU are highly consistent with the results of the simulation data.The design of the 17 m EDF in the C band and 21 m erbium fiber in the L band under this remote gain structure is consistent with the theoretical research.The transmission records of the experimental system show that the C+L band RGU designed based on theoretical research is feasible in the non-relay large-capacity transmission system and can greatly improve the transmission distance of the C+L band transmission system.The experimentally significant results obtained in the article provide experimental evidence for the performance,indicators,parameters,and standards of the system,guiding the expansion of signal bands in the application of high-capacity Ultra-Long-Haul(ULH)systems in China.
作者
梁宇东
喻杰奎
谭曼
段明雄
王文忠
龙函
徐健
黄超
李书恒
吴剑军
LIANG Yudong;YU Jiekui;TAN Man;DUAN Mingxiong;WANG Wenzhong;LONG Han;XU Jian;HUANG Chao;LI Shuheng;WU Jianjun(Wuhan Research Institute of Posts and Telecommunications,Wuhan 430074,China;Accelink Technologies Co.,Ltd.,Wuhan 430205,China)
出处
《光通信研究》
北大核心
2025年第1期35-39,共5页
Study on Optical Communications
