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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±0.01rad/(T·m),多根光纤测量结果在0.52~0.56rad/(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 study the magnetic susceptibility of fiber, a transmission model of Verdet constant measurement system based on Faraday effect was established by using Jones matrix. The influence of input optical fiber, output optical fiber and fiber under test on the output of the system is analyzed and simulated. The results show that the input polarization maintaining fiber has influence on the system output. The type of output fiber and fiber does not affect the system output, And determine the effective length of the fiber under test. The single-mode optical fiber was measured by a measuring system. The Verdet constant of the single-mode optical fiber measured was 0.52 ± 0.01 rad / (T · m). The measured results of multiple optical fibers were between 0.52 ~ 0.56 rad / (T · m) The measurement result under the driving voltage is linear with the driving current, which shows that the system has good linearity. The experimental results show that the system has good reliability and stability.