Measurement of Mode Coupling in Few-Mode Fiber Based on Rayleigh Backscattering

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

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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

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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

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Table 1. Comparison of measurement results of average mode coupling coefficients of 9.8 km three-mode fiberdB·km-1
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Table 1. Comparison of measurement results of average mode coupling coefficients of 9.8 km three-mode fiberdB·km-1
Method h_01,11a h_01,11b h_11a,01 h_11a,11b h_11b,01 h_11b,11a
Present method -26.40 -24.59 -27.08 - -25.86 -
MIMO method -25.33 -25.16 -26.45 - -26.62 -

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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): 806002

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