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从含有受激布里渊散射(SBS)的速率方程组出发,研究单频光纤放大器中,光纤内的温度分布对SBS的影响。计算表明,增大光纤内的温度梯度,可使得SBS的增益谱变宽,增益系数降低,进而抑制SBS;冷却信号光输出端附近的光纤,以增大光纤内的温度梯度,能有效抑制SBS;采用冷却光纤的方法来抑制SBS时,冷却光纤的位置和长度均存在最佳值,最佳值与抽运功率、温度梯度以及放大器中光纤总长度有关;采取最佳的冷却措施,能将抽运功率的阈值和放大器的输出功率提高2倍以上。
Based on the rate equations with stimulated Brillouin scattering (SBS), the influence of the temperature distribution in the fiber on the SBS in a single-frequency fiber amplifier was investigated. The calculation shows that increasing the temperature gradient in the fiber can widen the gain spectrum of the SBS and reduce the gain coefficient, and then suppress the SBS. Cooling the optical fiber near the output end of the signal light to increase the temperature gradient in the fiber can effectively suppress the SBS ; When the method of cooling the optical fiber to suppress the SBS, there is an optimal value for the position and the length of the cooling optical fiber. The optimum value is related to the pumping power, the temperature gradient and the total length of the optical fiber in the amplifier. Taking the best cooling measures, The threshold for pumping power and the output power of the amplifier are more than doubled.