Reflective fiber-optic refractometer based on a thin-core fiber tailored Bragg grating reflection.

A novel reflective refractometer based on a thin-core fiber (TCF) sandwiched between a leading single-mode fiber (SMF) and a fiber Bragg grating (FBG) imprinted SMF stub was demonstrated. The reflection from the fiber stub occurs in two well-defined wavelength bands, corresponding to the Bragg core mode and cladding modes. The TCF section functions as a tailorable bridge between the FBG core mode reflection and the surrounding refractive index (SRI). Linear response with enhanced sensitivity of 133.26 dB/refractive index unit for temperature-immune SRI measurement within the biologically desirable sensing range of 1.33-1.41 has been achieved via cost-effective power detection.

[1]  Hwa-Yaw Tam,et al.  Fabrication of a compact reflective long-period grating sensor with a cladding-mode-selective fiber end-face mirror. , 2009, Optics express.

[2]  Hwa-Yaw Tam,et al.  Reflective tilted fiber Bragg grating refractometer based on strong cladding to core recoupling. , 2009, Optics express.

[3]  Chongxiu Yu,et al.  Fiber refractometer based on a fiber Bragg grating and single-mode-multimode-single-mode fiber structure. , 2011, Optics letters.

[4]  Alan D. Kersey,et al.  Analysis of the response of long period fiber gratings to external index of refraction , 1998 .

[5]  Reinhardt Willsch,et al.  A fibre Bragg grating refractometer , 2001 .

[6]  Qiang Wu,et al.  High sensitivity SMS fiber structure based refractometer--analysis and experiment. , 2011, Optics express.

[7]  J M Baptista,et al.  Optical refractometer based on a birefringent Bragg grating written in an H-shaped fiber. , 2009, Optics letters.

[8]  Bo Dong,et al.  Simultaneous strain and temperature measurement using a compact photonic crystal fiber inter-modal interferometer and a fiber Bragg grating. , 2010, Applied optics.

[9]  Stephen W James,et al.  Optical fiber long-period gratings with Langmuir-Blodgett thin-film overlays. , 2002, Optics letters.

[10]  Yongfeng Lu,et al.  Optical fiber refractometer based on cladding-mode Bragg grating. , 2010, Optics letters.

[11]  Li Yang,et al.  Optimization of Cladding-Structure-Modified Long-Period-Grating Refractive-Index Sensors , 2007, Journal of Lightwave Technology.

[12]  Tuan Guo,et al.  Power-Referenced and Temperature-Calibrated Optical Fiber Refractometer , 2008, IEEE Photonics Technology Letters.

[13]  Lin Zhang,et al.  High-sensitivity optical chemsensor based on etched D-fibre Bragg gratings , 2004 .

[14]  W H Chung,et al.  Temperature-Insensitive Fiber Bragg Grating Based Tilt Sensor With Large Dynamic Range , 2011, Journal of Lightwave Technology.

[15]  G. Laffont,et al.  Tilted short-period fibre-Bragg-grating-induced coupling to cladding modes for accurate refractometry , 2001 .