采用多级放大结构的单频拉曼光纤放大器的数值模拟

冷进勇; 吴武明; 陈胜平; 侯静; 许晓军

doi:doi:10.3788/aos201131.0606007

光学学报, 2011, 31 (6): 0606007, 网络出版: 2011-05-31

采用多级放大结构的单频拉曼光纤放大器的数值模拟

Simulation on Single-Frequency Raman Fiber Amplifiers Utilizing Multi-Stage Amplification Scheme

论文大纲

冷进勇 ^*吴武明陈胜平侯静许晓军

作者单位

国防科学技术大学光电科学与工程学院，湖南，长沙 410073

摘要

高功率单频拉曼光纤放大器(SF-RFA)的性能往往会由于受激布里渊散射(SBS)的出现而受到限制。数值模拟结果表明单级SF-RFA的输出功率较低，且所需的抽运功率远高于实际器件所能承受的水平。采用多级放大结构可使SF-RFA的输出功率和效率均有较大幅度的提升；各级放大器应选择适当类型的光纤，在波分复用器（WDM）所能提供的抽运功率范围内，可得到较高的放大光输出。以二级放大系统为例，第一级放大器使用100 m、纤芯有效直径为6 μm的标准单模光纤，通过在光纤中施加应力梯度来抑制SBS，在抽运功率为32 W时，得到约3 W的输出；以此为第二级放大器的种子信号光，使用70 m、纤芯有效直径为15 μm的光纤，同样通过施加应力梯度抑制SBS，在抽运功率为105 W和130 W时可分别得到20 W和30 W的放大光输出。

Abstract

High-power operation of single-frequency Raman fiber amplifiers (SF-RFA) is usually limited by the onset of stimulated Brillouin scattering (SBS). Simulation results indicate that the output power of a single-stage SF-RFA is always low and the needed pump power is too high to satisfy. The amplifiers with multiple stages have comparatively higher output power and efficiency. Different types of fiber should be provided in different stages so that the output power could be optimized according to the attainable pump power. Taking a two-stage amplifier as an example, 100 m fiber with the core diameter of 6 μm is used in the first stage. By utilizing strain gradients along the fiber to suppress the SBS, the output of the first stage is increased to 3 W under the pump power of 32 W. The output power of the first stage is seeded into the second stage with an isolator between them. The second stage is composed by 70 m fiber with the core diameter of 15 μm. By suppressing the SBS with strain gradients, 20 W and 30 W output powers are obtained with the pump powers of 105 W and 130 W, respectively.

参考文献

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冷进勇, 吴武明, 陈胜平, 侯静, 许晓军. 采用多级放大结构的单频拉曼光纤放大器的数值模拟[J]. 光学学报, 2011, 31(6): 0606007. Leng Jinyong, Wu Wuming, Chen Shengping, Hou Jing, Xu Xiaojun. Simulation on Single-Frequency Raman Fiber Amplifiers Utilizing Multi-Stage Amplification Scheme[J]. Acta Optica Sinica, 2011, 31(6): 0606007.

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