基于GLM的多模光纤放大器模式控制研究

为了提高多模光纤放大器输出光束质量,基于多模纤芯中各个模式的传输和放大机理,提出了一种新的模式控制方法——增益-损耗控制,通过变化纤芯中掺杂的浓度、形状和材料,实现对高阶模式的抑制。根据多模纤芯双包层掺镱光纤放大器模型,对基于增益-损耗控制的选模特性进行了数值模拟和实例分析,得到了优化设计方法。结果表明,该方法可以有效抑制放大器中的高阶模,输出基模功率百分比可达90%以上。

Mode control in a multimode fiber amplifier based on gain-loss-management (GLM)

In order to optimize the output beam quality of a multimode fiber amplifier,a novel mode control method, gain-loss-management (GLM),was proposed.The mode discrimination for optimized gain distribution and additionally incorporated loss distribution was analyzed.The effect of the various dopant profiles was discussed,and the method to design GLM fiber was obtained.The results show that GLM method can efficiently suppress the power of higher-order modes in multimode cores and the output percentage of the fundamental mode can exceed 90%.