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理论分析了基于白光干涉的保偏光纤偏振模式耦合检测原理,并以迈克尔逊干涉仪对保偏光纤的偏振耦合的耦合强度和耦合点的位置进行了测试。由于机械式扫描干涉仪和信号处理电路会受到环境干扰和各种噪声的影响,限制了系统偏振耦合检测的灵敏度,应用小波变换对检测信号进行了分析,采用软阈值方法降噪处理,有效地去除了各种干扰和噪声,提高了干涉信号的信噪比3.2dB,耦合强度测试灵敏度也相应地得到了提高,增强了测试系统检测微弱偏振耦合的能力。
The principle of polarization mode coupling detection of polarization-maintaining optical fiber based on white light interference is theoretically analyzed. The coupling strength and the position of the coupling point of the polarization-coupled polarization-maintaining fiber of the polarization-maintaining fiber are tested by Michelson interferometer. Because of mechanical interference interferometer and signal processing circuit will be affected by environmental interference and a variety of noise, the system limits the polarization coupled detection sensitivity, the application of wavelet transform detection signal, using the soft threshold method of noise reduction, effectively Removed a variety of interference and noise, improve the signal to noise ratio of the interference signal 3.2dB, coupling strength test sensitivity has also been improved accordingly, enhancing the ability of the test system to detect weak polarization coupling.