Gain guided and index alternate-guided (GGIA-G) fiber was suggested by our group recently. In this work, the improved rate equations of the GGIA-G fiber laser were established and solved. The pump and signal light power distribution along the fiber longitudinal axis were simulated under the conditions of forward, backward and bidirectional pump. Furthermore, a theoretical three-dimensional temperature distribution model of the GGIA-G fiber laser was established, and the temperature distribution characteristics along both the fiber longitudinal axis and radius were simulated and compared when the fiber was pumped with different methods. The research results show that different pump method has obvious influence on both signal light power distribution and the fiber temperature. When the fiber is forward pumped, the signal light power in the fiber is the highest, and when the fiber is bidirectionally pumped, the temperature of the fiber is the lowest. The research conclusions are helpful in the application of the GGIA-G fiber.

中文翻译：

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增益导引与折射率交替导引光纤激光器光功率及三维温度分布特性分析

增益导引和折射率交替导引（GGIA-G）光纤是我们组最近提出的。本文建立并求解了改进的GGIA-G光纤激光器的速率方程。模拟了正向、反向和双向泵浦条件下沿光纤纵轴的泵浦和信号光功率分布。进一步建立了GGIA-G光纤激光器的三维温度分布理论模型，模拟比较了不同方法泵浦光纤沿光纤纵轴和半径方向的温度分布特性。研究结果表明，不同的泵浦方式对信号光功率分布和光纤温度都有明显的影响。当光纤被前向泵浦时，光纤中的信号光功率最高，双向泵浦时，光纤的温度最低。研究结论有助于GGIA-G光纤的应用。