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建立了双包层光纤光学放电现象的理论模型,并对其进行了数值模拟。结果表明双包层光纤放电传输速度随功率密度增加而非线性增加。当功率密度较大时,速度增加较为缓慢。光学放电的功率密度阈值与初始加热温度有关,当加热温度一定时,功率密度阈值随芯径增大而减小。从实验上比较了不同芯径双包层光纤的光学放电阈值,实验结果与模型结论符合较好。比较了芯径相同、内包层直径不同的光纤的放电传输速度与功率密度的关系。结果表明内包层直径较大的光纤放电传输阈值略高,但传输速度与功率密度的关系基本一致,说明芯径是影响放电传输速度的主要因素。
The theoretical model of optical double-clad fiber optical discharge was established and its numerical simulation was carried out. The results show that the transmission speed of double-clad fiber increases nonlinearly with the increase of power density. When the power density is larger, the speed increases more slowly. The power density threshold of optical discharge is related to the initial heating temperature. When the heating temperature is constant, the power density threshold decreases with the increase of the core diameter. The optical discharge thresholds of double-clad optical fiber with different core diameters are compared experimentally, and the experimental results are in good agreement with the model conclusions. The relationship between the discharge transmission speed and the power density of optical fibers with the same core diameter and different inner cladding diameters was compared. The results show that the transmission threshold of the optical fiber with larger inner cladding diameter is slightly higher, but the relationship between the transmission speed and the power density is basically the same, indicating that the core diameter is the main factor that affects the discharge transmission rate.