Current sensing using circularly birefringent twisted solid-core photonic crystal fiber

被引：38

作者：

Beravat, R. ^{[1
]}

Wong, G. K. L. ^{[1
]}

Xi, X. M. ^{[1
]}

Frosz, M. H. ^{[1
]}

Russell, P. St. J. ^{[1
]}

机构：

[1] Max Planck Inst Sci Light, Guenther Scharowsky Str 1, D-91058 Erlangen, Germany

来源：

OPTICS LETTERS | 2016年 / 41卷 / 07期

关键词：

SENSORS;

D O I：

10.1364/OL.41.001672

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Continuously twisted solid-core photonic crystal fiber (PCF) exhibits pure circular birefringence (optical activity), making it ideal for current sensors based on the Faraday effect. By numerical analysis, we identify the PCF geometry for which the circular birefringence (which scales linearly with twist rate) is a maximum. For silica-air PCF, this occurs at a shape parameter (diameter-to-spacing ratio of the hollow channels) of 0.37 and a scale parameter (spacing-to-wavelength) of 1.51. This result is confirmed experimentally by testing a range of different structures. To demonstrate the effectiveness of twisted PCF as a current sensor, a length of fiber is placed on the axis of a 7.6 cm long solenoid, and the Faraday rotation is measured at different values of dc current. The system is then used to chart the wavelength dependence of the Verdet constant. (C) 2016 Optical Society of America

引用

页码：1672 / 1675

页数：4

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