高精度保偏光纤拍长测试

基于光相干域偏光测试技术,提出了一种高精度的保偏光纤拍长测试方法,实现了不同结构、不同尺寸保偏光纤的拍长测试。阐述了光相干域偏光测试技术原理并推导出测量方程;以迈克尔逊干涉仪为基础建立了测试系统并采用调制解调技术实现了信号的高精度检测。实验结果表明,系统的测量精度为0.01 mm。在此系统上进行了测试精度和重复性研究并对不同结构和尺寸的八种保偏光纤进行了实际测量,拍长测量精度和重复性均优于0.01 mm。

Precision measurement scheme for beat-length of polarization maintain optical fiber

A precision measurement scheme for beat-length of polarization maintain optical fiber was proposed based on optical coherence domain polarimetry, and the beat-length of polarization maintain optical fiber with different structures and sizes was measured. The principle of optical coherence domain polarimetry was demonstrated and the beat-length measurement equation was derived. A meas- urement system was setup by modifying the Michelson interferometer and precision measurement was achieved with the modulation and demodulation technology. The error analysis shows that the measuring error is less than 0.01 mm. The performance including accuracy and repetition was investigated with this system, the beat-lengths of 8 types of polarization maintain optical fibers with different structures and sizes were measured, the result shows that the accuracy and repetition of beat-length measurement are both better than 0.01 mm.