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建立了局部放电引起保偏光纤(PMF)两偏振模间相位延迟变化的模型。将熊猫型保偏光纤(P-PMF)和保偏光子晶体光纤(PM-PCF)分别接入萨格纳克干涉仪进行实验研究,发现局部放电使应力型P-PMF的相位延迟变小,使形状型PM-PCF的相位延迟变大,且改变放电电流大小和持续时间可有效改变相位延迟调节量,为调节PMF中两偏振模间相位延迟提供了实用技术。搭建了在线光纤波片制作装置,进行了PM-PCF光纤1/4波片制作的实验研究,实现了0.15°的相位延迟精度。多次实验结果表明,采用该技术可保证约0.24°的相位延迟精度。该技术具有操作简单、成本低等优点,可有效提高光纤波片的相位延迟量精度和制作效率。
The model of phase delay between two polarization modes of PMF was established. The P-PMF and PM-PCF were respectively connected to Sagnac interferometer for experimental study. It was found that the phase delay of stress-type P-PMF was reduced by PD, As a result, phase delay of shape PM-PCF becomes larger, and changing the size and duration of discharge current can effectively change the amount of phase delay adjustment, which provides a practical technique for adjusting the phase delay between two PMs in PMF. An on-line optical fiber wave plate making device was set up and an experimental study on PM-PCF 1/4 wave plate fabrication was carried out. The phase delay accuracy of 0.15 ° was achieved. Multiple experimental results show that the phase delay accuracy of about 0.24 ° can be guaranteed by this technique. The technique has the advantages of simple operation and low cost, and can effectively improve the accuracy and efficiency of the phase delay of the optical fiber wave plate.