为探索能够应用于集总式拉曼放大的新型光纤材料,采用掺TiO₂光纤作为增益介质分别设计了一阶、二阶拉曼放大器。给出了高功率转换效率且增益平坦的泵浦参数配置方案,在总泵浦光功率不变的情况下对比了掺TiO₂光纤的一阶、二阶拉曼放大器与掺GeO₂光纤的二阶拉曼放大器的增益特性。仿真结果表明,在L波段60nm的谱宽范围内,32dBm的泵浦光前向注入长达6 km的掺TiO₂光纤对3 dBm的信号光进行二阶拉曼放大,其功率转换效率可达41.57%,增益平坦度仅为1.14 dB,对比掺GeO₂光纤的二阶拉曼放大器具有更平稳的输出增益。

In order to explore new fiber materials that can be used for discrete Raman amplification,first-and second-order Raman amplifiers are designed based on TiO₂-doped fiber.A pump parameter configuration scheme with high power conversion efficiency and flat gain is given.The gain characteristics of first-order and second-order Raman amplifiers based on TiO₂-doped fiber and second-order Raman amplifiers based on GeO₂-doped fiber are compared with the same total pump power.The simulation result shows that in the 60 nm bandwidth range of L-band,32 dBm pump light is injected forward into 6 km long TiO₂-doped fiber to amplify 3 dBm signal light. Its power conversion efficiency can reach 41.57%,and the gain flatness is only 1.14 dB.Compared with the second-order Raman amplifier doped with GeO₂ fiber,it has a more stable output gain.

国家自然科学基金(61775180)、 国际科技合作计划项目陕西省重点研发计划(2020KWZ-017)和西安邮电大学研 究生创新基金项目(CXJJDL2021006)资助项目