空芯光子晶体光纤磁敏感性研究

空芯光子晶体光纤是一种新型的陀螺用光纤,较传统光纤具有良好的抗磁性,光纤的磁敏感性是由光纤的Verdet 常数来表征的。为研究空芯光子晶体光纤的磁敏感性,利用Comsol 软件对HC-1550-2 空芯光子晶体光纤的Verdet 常数进行仿真计算,选用含有法拉第旋转反射镜(FRM)的反射式双光路测量方案对空芯光子晶体光纤的Verdet 常数进行实验测量。双光路测量系统中的FRM 可以消除被测光纤中线性双折射对测量的影响。仿真与测量结果相吻合,且由结果可知空芯光子晶体光纤的Verdet 常数约为传统光纤的1/100 倍,验证了空芯光子晶体光纤在陀螺降低磁敏感性方面的优势。

Magnetic-field sensitivity of air- core photonic crystal fiber

Air-core photonic crystal fiber is a new optical fiber used in fiber-optic gyroscope, which has better diamagnetic than traditional optical fiber. Magnetic-field sensitivity of the fiber is characterized by the Verdet constant of the fiber. In order to study the magnetic-field sensitivity of air-core photonic crystal fiber, Comsol software was used to simulate the Verdet constant of HC-1550-2 air-core photonic crystal fiber in this paper. At the same time, a dual-optical system including a Faraday Rotation Mirror (FRM) was chosen to measure the air-core photonic crystal fiber's Verdet constant. In the system, the FRM can eliminate the influence of the linear birefringence in the tested fiber on measurement. The measured results are in agreement with the simulation results. It can be seen from the results, Verdet constant of air-core photonic crystal fiber is nearly 1/100 of the traditional optical fiber, which verifies that air-core photonic crystal fiber has the advantages on decreasing the magnetic-field sensitivity.