为对光纤磁敏感性进行研究，基于法拉第效应原理，利用琼斯矩阵建立了全光纤型光纤Verdet常数测量系统的传输模型。对输入端光纤、输出端光纤、被测光纤对系统输出的影响进行了分析与仿真，结果表明测量系统中输入端保偏光纤对系统输出有影响，输出端光纤及光纤种类不影响系统输出，并确定了被测光纤的有效被测长度。搭建测量系统对单模光纤进行测量，测量的单模光纤Verdet常数为0.52±0.01 rad/(T·m)，多根光纤测量结果在0.52～0.56 rad/(T·m)之间，且不同驱动电压下的测量结果与驱动电流成线性关系，说明系统线性度好。实验结果证明了此系统具有很好的可靠性与稳定性。

In order to research the magnetic-optical characteristic, an all fiber-optical structure system is built to measure the fibers′ Verdet constant based on the Faraday effect. The system′s theoretical model is built with the Jones matrix. Through analysis and simulation, it is shown that the input fiber can influence the measurement result, while the result is independent of the output fiber contrarily. Meanwhile the optimum length of the measured fiber is confirmed. Experimental system is built to measure the SMF-28e fiber′s Verdet constant. The measurement results prove that the Verdet constant of the SMF-28e fiber is 0.52±0.01 rad/(T·m), and the measurement results range from 0.52 rad/(T·m) to 0.56 rad/(T·m). Experiment is also taken under different driving voltages, and the result shows that the system has good linearity and feasibility, which also demonstrates the reliability and slability of the system.