کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1533554 | 1512568 | 2015 | 5 صفحه PDF | دانلود رایگان |
• This paper proposes a method based on the photoinduced birefringence of thin-cladding long-period fiber grating for surrounding refractive index measurement.
• The core mode and cladding modes for optical fibers of various cladding radii are analyzed with the three-layer fiber model.
• The sensing principle is analyzed using the full-vector coupled mode equations and the Stokes parameters, and the effects of LPFG and incident light parameters on the sensing properties are investigated.
• The method needs a tunable laser source for the measurement of output light polarization states.
In this paper, a new method to measure the surrounding refractive index (SRI) is proposed. It is based on the core-only photoinduced birefringence of long-period fiber grating (LPFG). The relationship between Stokes parameters of output light polarization states and SRI is analyzed using full-vector coupled mode equations. Compared to the conventional LPFG SRI sensors, this sensing method features a fairly good linearity performance and reasonably high resolution over a much broader SRI measurement range from 1 to 1.46 which may be applied to the humidity and vapor sensing.
Journal: Optics Communications - Volume 355, 15 November 2015, Pages 607–611