Rayleigh Backscattering Based Macrobending Single Mode Fiber for Distributed Refractive Index Sensing

Abstract A novel and compact distributed refractive index (RI) sensor based on Rayleigh backscattering and macrobending single mode fiber (SMF) is proposed and experimentally investigated. Our proposed sensor is simply fabricated by bending a piece of SMF to a radius of curvature in several millimeters. We detect the refractive index of the external medium surrounding the macrobending fiber, for the first time, by analyzing the Rayleigh backscattering signals recorded from optical frequency domain reflectometry. We measure the range of the RI from 1.3348 to 1.3557 using the proposed method. To verify the capability of the distributed sensing, we also use this sensor to detect multipoint RIs simultaneously. The RI measurement sensitivities are 2319.24 GHz/RIU (18.55 nm/RIU) and 2717.85 GHz/RIU (21.74 nm/RIU) with bending diameters of 12.2 mm and 11.3 mm, respectively. In addition, our macrobending fiber has its original buffer coating remaining intact, allowing the fiber to maintain optimal mechanical property and be suitable for more practical applications.

[1]  Reginald K. Lee,et al.  Highly sensitive fiber Bragg grating refractive index sensors , 2005 .

[2]  Joel Villatoro,et al.  High-resolution refractive index sensing by means of a multiple-peak surface plasmon resonance optical fiber sensor , 2006 .

[3]  Tao Wei,et al.  Temperature-insensitive miniaturized fiber inline Fabry-Perot interferometer for highly sensitive refractive index measurement. , 2008, Optics express.

[4]  Gerald Hefferman,et al.  Multiplexed Oil Level Meter Using a Thin Core Fiber Cladding Mode Exciter , 2015, IEEE Photonics Technology Letters.

[5]  Q. Han,et al.  Self-temperature-compensative refractometer based on singlemode–multimode–singlemode fiber structure , 2015 .

[6]  Orlando Frazão,et al.  A reflective optical fiber refractometer based on multimode interference , 2012 .

[7]  Qiang Wu,et al.  A Macrobending Singlemode Fiber Refractive Index Sensor for Low Refractive Index Liquids , 2010 .

[8]  Long Jin,et al.  Bending effect on modal interference in a fiber taper and sensitivity enhancement for refractive index measurement. , 2013, Optics express.

[9]  Tao Wei,et al.  Long-Period Grating Inscribed on Concatenated Double-Clad and Single-Clad Fiber for Simultaneous Measurement of Temperature and Refractive Index , 2012, IEEE Photonics Technology Letters.

[10]  Temperature performance of a macrobending single-mode fiber-based refractometer. , 2010, Applied optics.

[11]  Jun Zhang,et al.  Fabrication of Side-Polished Single Mode-Multimode-Single Mode Fiber and Its Characteristics of Refractive Index Sensing , 2017, IEEE Journal of Selected Topics in Quantum Electronics.

[12]  R. E. Russo,et al.  Temperature Effects on a Fiber-Optic Evanescent Wave Absorption Sensor , 1994 .

[13]  Xudong Fan,et al.  On the performance quantification of resonant refractive index sensors. , 2008, Optics express.

[14]  O. Wolfbeis.  Fiber-optic chemical sensors and biosensors. , 2000, Analytical chemistry.

[15]  Gerald Hefferman,et al.  Ultraweak intrinsic Fabry-Perot cavity array for distributed sensing. , 2015, Optics letters.

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

[17]  Ying Huang,et al.  Glass fiber–reinforced polymer–packaged fiber Bragg grating sensors for ultra-thin unbonded concrete overlay monitoring , 2015 .

[18]  Deming Liu,et al.  Microfiber Fabry-Perot interferometer fabricated by taper-drawing technique and its application as a radio frequency interrogated refractive index sensor. , 2012, Optics letters.

[19]  P. Caldas,et al.  Fabry-Perot refractometer based on an end-of-fiber polymer tip. , 2009, Optics letters.

[20]  A. Harris,et al.  Bend loss measurements on high numerical aperture single-mode fibers as a function of wavelength and bend radius , 1986 .

[21]  Chunliu Zhao,et al.  Highly reflective long period fiber grating sensor and its application in refractive index sensing , 2014 .

[22]  Kun Liu,et al.  Cryogenic Temperature Measurement Using Rayleigh Backscattering Spectra Shift by OFDR , 2014, IEEE Photonics Technology Letters.

[23]  Yuliya Semenova,et al.  A Macrobending Singlemode Fiber Based Refractometer , 2019 .

[24]  Q. Han,et al.  Simultaneous Measurement of Refractive Index and Temperature Using a Cascaded FBG/Droplet-Like Fiber Structure , 2015, IEEE Sensors Journal.

[25]  M. Froggatt,et al.  High-spatial-resolution distributed strain measurement in optical fiber with rayleigh scatter. , 1998, Applied optics.

[26]  Yi Bao,et al.  Concrete pavement monitoring with PPP-BOTDA distributed strain and crack sensors , 2016 .

[27]  Xiaoyi Bao,et al.  In-fiber Mach–Zehnder interferometric refractive index sensors with guided and leaky modes , 2015 .

[28]  Fiber Optic Refractometer Based on Leaky-Mode Interference of Bent Fiber , 2015, IEEE Photonics Technology Letters.

[29]  Benjamin J. Eggleton,et al.  Ultra-sensitive photonic crystal fiber refractive index sensor , 2009, 2009 Conference on Lasers and Electro-Optics and 2009 Conference on Quantum electronics and Laser Science Conference.