中国激光, 2017, 44 (8): 0806002, 网络出版: 2017-09-13
基于背向瑞利散射的少模光纤模式耦合测量 
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Measurement of Mode Coupling in Few-Mode Fiber Based on Rayleigh Backscattering
图 & 表
图 1. 少模光纤模式耦合测量实验装置图
Fig. 1. Experimental setup of mode coupling measurement in few-mode fiber
图 2. 从(a) LP01模口、(b) LP11a模口和(c) LP11b模口入射时光子灯笼输出尾纤的模态图
Fig. 2. Modal graphs of photonic lantern's output pigtail injected from (a) LP01, (b) LP11a and (c) LP11b
图 3. 以LP01模为激发模的测量结果。(a) LP01模、LP11a模和LP11b模的背向散射功率分布图; (b) LP11a模与LP01模的模式耦合比随传输距离的分布曲线;(c) LP11b模与LP01模的模式耦合比随传输距离的分布曲线
Fig. 3. Measurement results when LP01 is used as excitation mode. (a) Backscattering power distribution of LP01, LP11a and LP11b modes; (b) distribution curve of mode coupling ratio between LP11a and LP01 modes along transmission distance; (c) distribution curve of mode coupling ratio between LP11b and LP01 modes along transmission distance
图 4. 以LP11a模为激发模的测量结果。(a) LP01模、LP11a模和LP11b模的背向散射功率分布图;(b) LP01模与LP11a模的模式耦合比随传输距离的分布曲线;(c) LP11a模与LP11b模的模式耦合比随传输距离的分布曲线
Fig. 4. Measurement results when LP11a is used as excitation mode. (a) Backscattering power distribution of LP01, LP11a and LP11b modes; (b) distribution curve of mode coupling ratio between LP01 and LP11amodes along transmission distance; (c) distribution curve of mode coupling ratio between LP11a and LP11b modes along transmission distance
图 5. 以LP11b模为激发模的测量结果。(a) LP01模、LP11a模和LP11b模的背向散射功率分布图;(b) LP01模与LP11b模的模式耦合比随传输距离的分布曲线;(c) LP11a模与LP11b模的模式耦合比随传输距离的分布曲线
Fig. 5. Measurement results when LP11b is used as excitation mode. (a) Backscattering power distribution of LP01, LP11a and LP11b modes; (b) distribution curve of mode coupling ratio between LP01 and LP11b modes along transmission distance; (c) distribution curve of mode coupling ratio between LP11a and LP11b modes along transmission distance
表 19.8 km三模光纤的平均模式耦合系数测量结果对比
Table1. Comparison of measurement results of average mode coupling coefficients of 9.8 km three-mode fiberdB·km-1
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陈翠光, 胡贵军, 刘峰, 王勃然, 陈威成. 基于背向瑞利散射的少模光纤模式耦合测量[J]. 中国激光, 2017, 44(8): 0806002. Chen Cuiguang, Hu Guijun, Liu Feng, Wang Boran, Chen Weicheng. Measurement of Mode Coupling in Few-Mode Fiber Based on Rayleigh Backscattering[J]. Chinese Journal of Lasers, 2017, 44(8): 0806002.
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