Analysis of Factors Affecting Accuracy of Brillouin Frequency Shift Extraction Based on Similarity Matching

Lijuan Zhao; Heqing Wang; Zhiniu Xu; Xiaoxia Che

doi:10.3788/CJL202047.0506003

Chinese Journal of Lasers, Volume. 47, Issue 5, 0506003(2020)

Analysis of Factors Affecting Accuracy of Brillouin Frequency Shift Extraction Based on Similarity Matching

Lijuan Zhao¹, Heqing Wang¹, Zhiniu Xu^2、*, and Xiaoxia Che¹

¹Department of Electronic and Communication Engineering, North China Electric Power University, Baoding, Hebei 0 71003, China

²Department of Electrical Engineering, North China Electric Power University, Baoding, Hebei 0 71003, China

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Figures & Tables(14)

Fig. 1. Brillouin gain spectrum

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Fig. 2. Schematic of similarity matching method

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Fig. 3. Measured Brillouin spectrum and calculated frequency shift results. (a) Brillouin spectra for calculation; (b) BFS along the fiber by the model method when the average superposition is 2¹⁸; (c) difference in calculated BFS between the two methods when the average superposition is 2¹⁴

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Fig. 4. Influence of linewidth on frequency shift extractionaccuracy under different sampling point number of SDS

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Fig. 5. Influence of linewidth of SDS on algorithm accuracy under different SNR of SDS

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Fig. 6. Influence of SNR of SRS on frequency shift extraction accuracy under different SNR of SDS

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Fig. 7. Influence of SNR of SDS on frequency shift extraction accuracy under different SNR of SRS

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Fig. 8. Influence of sweeping step of SRS on frequency shift extraction accuracy under different SNR of SDS

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Fig. 9. Influence of sweeping step of SDS on frequency shift extraction accuracy under different SNR of SDS.(a) Error of BFS; (b) normalized error of BFS

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Fig. 10. Influence of sweeping range of SRS on frequency shift extraction accuracy under different SNR of SDS. (a) Error of BFS; (b) algorithm runtime

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Fig. 11. Influence of sweeping range of SDS on frequency shift extraction accuracy. (a) SDS symmetrical about v_B; (b) SDS not symmetrical about v_B

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Table 1. Fitting results of influence of linewidth on frequency shift extraction accuracy
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Table 1. Fitting results of influence of linewidth on frequency shift extraction accuracy
Number of samplingpoints of SDS p SSE RMSE
3 0.03795 0.05925 0.06606
5 0.02696 0.00489 0.0187
10 0.02003 0.00224 0.0126
15 0.01717 0.00083 0.0077
20 0.01528 0.00069 0.007
25 0.01402 0.00054 0.0062

Table 2. Fitting results of influence of SNR of SRS on frequency shift extraction accuracy
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Table 2. Fitting results of influence of SNR of SRS on frequency shift extraction accuracy
SNR ofSDS /dB a b c SSE RMSE
0 0.2625 -0.0075 5.013 0.0004 0.0206
5 3.845 -0.1197 2.778 0.0001 0.1261
10 5.6613 -0.124 1.5089 0.0003 0.0061
15 3.1407 -0.0867 0.7862 0.0002 0.0005
20 4.5399 -0.1054 0.4717 0.0001 0.0026

Table 3. Fitting results of influence of SNR of SDS on frequency shift extraction accuracy
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Table 3. Fitting results of influence of SNR of SDS on frequency shift extraction accuracy
SNR ofSRS /dB a b c SSE RMSE
30 5.001 -0.1269 0.254 0.0013 0.0183
35 4.983 -0.1284 0.1958 0.0004 0.0107
40 5.116 -0.1327 0.1815 0.0002 0.0082

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Lijuan Zhao, Heqing Wang, Zhiniu Xu, Xiaoxia Che. Analysis of Factors Affecting Accuracy of Brillouin Frequency Shift Extraction Based on Similarity Matching[J]. Chinese Journal of Lasers, 2020, 47(5): 0506003

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Paper Information

Category: fiber optics and optical communications

Received: Nov. 25, 2019

Accepted: Jan. 19, 2020

Published Online: May. 12, 2020

The Author Email: Zhiniu Xu (wzcnjxx@sohu.com)

DOI:10.3788/CJL202047.0506003

Topics

laser devices and laser physics

Lasers and Laser Optics

Laser physics

laser manufacturing

Instrumentation, Measurement and Metrology

Table 1. Fitting results of influence of linewidth on frequency shift extraction accuracy

Table 1. Fitting results of influence of linewidth on frequency shift extraction accuracy

Table 2. Fitting results of influence of SNR of SRS on frequency shift extraction accuracy

Table 2. Fitting results of influence of SNR of SRS on frequency shift extraction accuracy

Table 3. Fitting results of influence of SNR of SDS on frequency shift extraction accuracy

Table 3. Fitting results of influence of SNR of SDS on frequency shift extraction accuracy