超宽带拉曼光纤放大器的研究

Research on Ultra Wideband Raman Fiber Amplifier

【目的】新兴技术的涌现推动着光纤通信容量不断提高,这对光纤放大器的工作波长范围提出了新的要求,因此迫切需要能够实现超宽带放大的光纤放大器。【方法】为了实现增益范围覆盖Super-C band和Super-L band的超宽带拉曼光纤放大器(RFA),文章在理论上建立了RFA的传输模型,介绍了后向RFA传输模型的数值求解方法。考虑实际情况选择泵浦功率以及波长范围,文章使用6个泵浦波长和7个泵浦激光器,在G.652光纤中仿真得到了一组优化后的泵浦波长配置,根据这组泵浦波长配置,在G.652、G.654和大有效面积光纤(LEAF)3种光纤中进行了测试,并将仿真与测试结果进行了对比分析。【结果】在G.652光纤中测试得到了18.07 dB净增益和1.54 dB的增益平坦度;在G.654光纤中测试得到了13.9 dB净增益和1.21 dB的增益平坦度;在LEAF中测试得到了21.99 dB净增益和1.80 dB增益平坦度。仿真与测试结果净增益相差不超过0.2 dB,增益平坦度相差不超过0.4 dB。【结论】仿真与测试结果对比表明文章使用的后向RFA数值求解方法能够准确预测RFA的增益谱。文章使用的泵浦波长配置经过实验验证,在3种光纤中都有较大的增益和较好的增益平坦度,在商用超宽带RFA的波长选择上具有参考价值。

【Objective】The emergence of new technologies is driving the continuous improvement of fiber optic communication capacity,which poses new requirements for the working wavelength range of fiber amplifiers.Therefore,there is an urgent need for fiber amplifiers that can achieve ultra wideband amplification.【Methods】In order to achieve ultra wideband Raman Fiber Amplifier(RFA)with gain ranges covering Super-C and Super-L bands,a transmission model of RFA was theoretically established,and numerical solutions for the transmission model of backward RFA were introduced.The pump power and wavelength range were selected considering the actual situation.Six pump wavelengths and seven pump lasers were used to simulate an optimized set of pump wavelength configurations in G.652 fiber.Based on the configuration of these pump wavelengths,experimental tests were conducted on three types of fibers:G.652,G.654,and Large Effective Area Fiber(LEAF).The simulation and experimental results were compared and analyzed.【Results】The results show that a net gain of 18.07 dB and a gain flatness of 1.54 dB were obtained through testing in G.652 fiber.A net gain of 13.9 dB and a gain flatness of 1.21 dB were obtained through testing in G.654 fiber.A net gain of 21.99 dB and a gain flatness of 1.80 dB were tested in LEAF.The difference between the simulation results and the test results is less than 0.2 dB,and the difference in gain flatness is less than 0.4 dB.【Conclusion】The comparison between simulation results and test results indicates that the numerical solution method used in this paper can accurately predict the gain spectrum of RFA.The pump wavelength configuration used in this article has been experimentally verified to have significant gain and good gain flatness among the three types of fibers,which has reference value for wavelength selection in commercial ultra wideband RFA.