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高功率单频拉曼光纤放大器(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。在综合考虑受激拉曼散射和SBS过程的基础上,提出了SBS限制下的RFA中的强度耦合方程组。通过在耦合方程中加入温度场和应力场,讨论温度场和应力场对SBS阈值的影响。分析表明,虽然单独依靠温度场或者应力场都能很好地抑制SBS,提升放大器的性能,但要求都比较苛刻,很难真正实现。提出了一种综合使用温度和应力梯度的方案,在实际可操作的范围内,将RFA的输出功率提高了3倍。数值模拟的结果为实验研究高功率单频RFA中抑制SBS提供了一定的指导。
The performance of high-power single-frequency Raman fiber amplifiers (RFAs) tends to be limited by the appearance of stimulated Brillouin scattering (SBS). On the basis of considering the stimulated Raman scattering and the SBS process, the intensity coupling equations in the RFA under SBS are proposed. By adding the temperature field and the stress field into the coupled equation, the influence of temperature and stress field on the SBS threshold is discussed. The analysis shows that although the temperature field or the stress field alone can restrain the SBS well and improve the performance of the amplifier, the requirements are rather harsh and difficult to be realized. Proposed a combination of temperature and stress gradient program, in the practical range, the RFA output power increased by 3 times. The results of numerical simulation provide some guidance for the experimental study of suppressing SBS in high power single frequency RFA.