随着新一代移动通信系统发展，对高数据速率和更大带宽的需求日益增加，利用碲基光纤作为传输介质，采用了两路二阶泵浦和四路一阶泵浦设计的二阶拉曼光纤放大器实现了对C+L全波段信号光进行放大，能够有效缓解带宽增长给光通信网络带来的挑战。首先对简化后的二阶拉曼耦合波方程进行数值求解，再利用合作搜索算法对二阶拉曼光纤放大器泵浦参数进行优化，以达到提升系统输出性能的目的。同时，分析了在相同泵浦参数的配置下一阶拉曼光纤放大器和二阶拉曼光纤放大器的性能以及二阶泵浦光功率、光纤长度这两个重要因素对二阶碲基拉曼光纤放大器平均输出增益和增益平坦度的影响。最终在1530~1630 nm的超宽带宽范围内，设计出的二阶碲基光纤拉曼放大器平均输出增益为27.3601 dB，增益平坦度为0.6601 dB。

Recently, with the development of new-generation mobile communication systems, the demand for high data rates and large bandwidth is increasing. In this study, we proposed a second-order Raman fiber amplifier designed with two second-order pumps and four first-order pumps to amplify the C+L full-band signal light using a tellurium-based optical fiber as the transmission medium, which can effectively alleviate optical communication network challenges due to bandwidth growth. First, a simplified second-order Raman coupled wave equation is solved numerically, and then the pumping parameters of the second-order Raman fiber amplifier are optimized using a cooperative search algorithm to improve output performance. Meanwhile, the performance of first- and second-order Raman fiber amplifiers under the same pump parameter configuration is analyzed. Additionally, the influence of two key factors, that is, second-order pump optical power and fiber length on the average output gain and gain flatness of a designed second-order tellurium-based Raman fiber amplifier are investigated. Experimental results show that the average output gain of the designed second-order tellurium-based fiber Raman amplifier is 27.3601 dB and the gain flatness is 0.6601 dB in the ultrawide bandwidth range of 1530?1630 nm.