Interference between two orthogonally polarized modes traversing a highly birefringent air-silica microstructure fiber
Interference between two orthogonally polarized modes traversing a highly birefringent air-silica microstructure fiber
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DOI：
10.1109/jlt.2005.843522
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发表时间：
2005-04
影响因子：
4.7
通讯作者：
Nori Shibata;A. Nakazono;Yoshinori Inoue
中科院分区：
文献类型：
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作者：
Nori Shibata;A. Nakazono;Yoshinori Inoue
高双折射光纤可用作干涉型光纤陀螺和压力传感器中的保偏光纤。从理论和实验上研究了穿过高双折射空气-石英微结构光纤的两个正交偏振模之间的干涉。该理论包括高双折射光纤的模式双折射的色散性质的影响。使用超辐射发光二极管进行测量，工作在846和973 nm的中心波长，光谱半宽度分别为7.4和8.1 nm，和一个9米的高双折射光纤。实验产生的干涉条纹可见度V值为0.4-0.5，即使当两个模式之间的有效光程差为零。该理论很好地解释了色散传播波在V的大小和高双折射光纤的相干曲线形状方面的时间相干特性。对标准单模光纤和在973 nm处具有3.2/spl ×/10/sup-6/的模式双折射的空气-石英微结构光纤的结果进行比较，以解决时间相干性。如果光纤具有小的双折射，则时间相干性的损失可以忽略。此外，分布式光纤压力传感器的检测灵敏度进行了测量，以表征时间相干响应。结果表明，在依赖于两个模式之间的干涉的光纤传感器中，干涉信号的灵敏度随着两个模式之间的色散差的增加而降低。
Highly birefringent fibers can be used as polarization-maintaining fiber in interferometer fiber optic gyros and in pressure sensors. Interference between two orthogonally polarized modes traversing a highly birefringent air-silica microstructure fiber is investigated theoretically and experimentally. The theory includes the effect of the dispersive nature of the modal birefringence of highly birefringent fiber. Measurements are conducted using super luminescent diodes operating at the center wavelengths of 846 and 973 nm with spectral half-widths of 7.4 and 8.1 nm, respectively, and a 9-m highly birefringent fiber. Experiments yield interference fringe visibility V values of 0.4-0.5, even when the effective optical path difference between the two modes is zero. The theory well explains the temporal coherence properties of dispersively propagating waves with regard to both the magnitude of V and the shape of the coherence curve for the highly birefringent fiber. A comparison of the results from a standard single-mode fiber and from an air-silica microstructure fiber with modal birefringence of 3.2/spl times/10/sup -6/ at 973 nm is made that addresses temporal coherence. The loss of temporal coherence can be ignored if the fiber has small birefringence. Furthermore, the detection sensitivity of a distributed fiber-optic pressure sensor is measured in order to characterize the temporal coherence response. The results reveal that, in fiber-optic sensors that depend on the interference between the two modes, interference signal sensitivity decreases as the chromatic dispersion difference between the two mode increases.