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| Investigation on the Influence of Alignment Angle Error of the Polarization Analyzer on Polarization Coupling easurement of Fiber Coil |
| WANG Xueqin1,CAO Zhifeng2,LIANG Lanju1 |
1. College of Opto-Electronic Engineering, Zaozhuang University, Zaozhuang,Shandong 277160, China
2. Institute of Dongying Special Equipment Inspection, Dongying, Shandong 257091, China |
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Abstract To investigate the influence of the alignment angle error between the polarization axis of polarization analyzer and the fiber polarization axis on the measurement results of the polarization coupling intensity of the fiber coil, the basic principle of using optical coherence domain polarization detection (OCDP) technology to test the polarization coupling intensity of the fiber coil is theoretically analyzed, and the relationship model between the coupling intensity of the polarization coupling point in the fiber coil and the alignment angle of the polarization analyzer is established. According to the relationship model, the variation of the measured value of polarization coupling intensity at the coupling point with the alignment angle of the polarization analyzer is simulated and analyzed. The simulation results show that the measurement error reaches minimum when the alignment angle between the polarization axis of the polarizer and the polarization axis of the fiber coil is 45°. The more the alignment angle deviates from 45°, the greater the intensity measurement error will be. When the alignment angle error between the polarization axis of the polarization analyzer and the polarization axis of the fiber coil is 0.6°, the measurement error of the polarization coupling intensity caused by the alignment angle error is 0.18dB. The measurement error of polarization coupling intensity caused by the error of polarization axis to axis can be less than 1dB by controlling the error of alignment angle within 3°.
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Received: 19 May 2023
Published: 03 April 2024
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2024, Vol. 45 
