Evanescent field characteristics of eccentric core optical fiber for distributed sensing.
Evanescent field characteristics of eccentric core optical fiber for distributed sensing.
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DOI：
10.1364/josaa.31.000475
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发表时间：
2014-03
期刊：
影响因子：
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通讯作者：
Jianxia Liu;Libo Yuan
中科院分区：
文献类型：
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作者：
Jianxia Liu;Libo Yuan
研究了偏心芯光纤的基本芯模截止和倏逝场。提出了一种通过求解ECOF本征方程来计算芯模截止的方法。利用保角变换，非对称的几何结构可以转化为一个简单的、易于求解的三层轴对称光纤。还计算了不同偏心距、波长、纤芯半径和涂层折射率时基本纤芯模截止频率V（c）的变化。利用偏心距和涂层折射率计算了ECOF的倏逝场分数功率。这些计算是必要的设计的ECOF的结构参数的长距离，单模分布式倏逝场吸收传感器。
Fundamental core-mode cutoff and evanescent field are considered for an eccentric core optical fiber (ECOF). A method has been proposed to calculate the core-mode cutoff by solving the eigenvalue equations of an ECOF. Using conformal mapping, the asymmetric geometrical structure can be transformed into a simple, easily solved axisymmetric optical fiber with three layers. The variation of the fundamental core-mode cut-off frequency (V(c)) is also calculated with different eccentric distances, wavelengths, core radii, and coating refractive indices. The fractional power of evanescent fields for ECOF is also calculated with the eccentric distances and coating refractive indices. These calculations are necessary to design the structural parameters of an ECOF for long-distance, single-mode distributed evanescent field absorption sensors.