掺铥光纤放大器对双单频激光放大的特性分析

Analysis of the Characteristics of the Thulium Doped Fiber Amplifier for Dual-single-frequency Amplification

建立了掺铥(Tm^(3+))光纤放大器对双单频激光放大的理论模型,对比分析了前向抽运方式下,双单频放大和单频放大时泵浦功率、信号功率、受激布里渊散射(SBS)功率,以及温度情况的不同。理论仿真了Tm^(3+)离子掺杂浓度、光纤纤芯的有效面积和换热系数对双单频放大的影响。适当的掺杂浓度,可以有效地缩小放大器中光纤长度,减弱因过长的光纤对激光的损耗,还可以提高放大器的量子效率;选取较小的光纤的纤芯有效面积,可以获得较高的信号功率输出和较小的SBS功率:较小的换热系数可以降低SBS功率,从而有效抑制SBS效应。

This paper established a theoretical model of the Thulium(Tm^(3+)) doped fiber amplifier for dual-single-frequency amplification.Forward pumping mode,the pump power,signal power,stimulated Brillouin scattering(SBS) power and temperature conditions were analyzed and compared in the dual-single-frequency amplification and single-frequency amplification.Theoretical simulation of the Tm^(3+) ion doping concentration,the effective area of the fiber core and heat transfer coefficient of the impact of dual-single-frequency amplification.Appropriate dopant concentration,can effectively reduce the fiber length of the amplifier,weakened the loss of laser due to excessive fiber,can also improve the quantum efficiency of the amplifier.Selecting the smaller effective area of the optical fiber core,it can obtain a higher output power and the smaller SBS power;smaller heat transfer coefficient can be reduced SBS power,so as to effectively suppress SBS effects.