基于掺TiO_(2)光纤的拉曼放大器特性研究

Research on characteristics of Raman amplifier based on TiO_(2)-doped fiber

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TiO_(2)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TiO_(2)光纤的一阶、二阶拉曼放大器与掺GeO_(2)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TiO_(2)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GeO_(2)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,firstand second-order Raman amplifiers are designed based on TiO_(2)-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 TiO_(2)-doped fiber and second-order Raman amplifiers based on GeO_(2)-doped fiber are compared with the same total pump power.The simulation result shows that in the 60nm bandwidth range of L-band,32dBm pump light is injected forward into 6km long TiO_(2)-doped fiber to amplify 3dBm signal light.Its power conversion efficiency can reach 41.57%,and the gain flatness is only 1.14dB.Compared with the second-order Raman amplifier doped with GeO_(2) fiber,it has a more stable output gain.