Power-referenced refractometer with tilted fiber Bragg grating cascaded by chirped grating

Abstract A power-referenced refractometer operating in reflection mode is proposed and experimentally demonstrated based on a tilted-fiber Bragg grating (TFBG) cascaded by a reflection-band-matched chirped-fiber Bragg grating (CFBG). The optical signal reflected by the CFBG passes twice through the TFBG that enhances sensitivity of the refractometer. In addition, the optical signal is propagating all the way in the fiber core so that the extra insertion loss is low. Refractive index measurement with sensitivity up to 597.2 μW/R.I.U. is achieved within the range from 1.333 to ~1.42. The maximum detectable refractive index is ~1.45.

[1]  A. Cusano,et al.  Thinned fiber Bragg gratings as refractive index sensors , 2005, IEEE Sensors Journal.

[2]  Byeong Ha Lee,et al.  Measurement of refractive-index variation with temperature by use of long-period fiber gratings. , 2002, Optics letters.

[3]  J. Albert,et al.  Compact fiber-optic vector inclinometer. , 2010, Optics letters.

[4]  M. Wuilpart,et al.  Tilted Fiber Bragg Grating Refractometer Using Polarization-Dependent Loss Measurement , 2008, IEEE Photonics Technology Letters.

[5]  Orlando Frazão,et al.  High birefringence D-type fibre loop mirror used as refractometer , 2008 .

[6]  Xinyong Dong,et al.  Polyvinyl alcohol-coated hybrid fiber grating for relative humidity sensing. , 2011, Journal of biomedical optics.

[7]  Ying Cui,et al.  Magnetic field sensor using tilted fiber grating interacting with magnetic fluid. , 2013, Optics express.

[8]  Yinian Zhu,et al.  Measurements of refractive index sensitivity using long-period grating refractometer , 2004 .

[9]  Kwan Seob Park,et al.  Simultaneous Measurements of Refractive Index and Thickness by Spectral-Domain Low Coherence Interferometry Having Dual Sample Probes , 2011, IEEE Photonics Technology Letters.

[10]  J. Albert,et al.  Tilted fiber Bragg grating sensors , 2013 .

[11]  Chamini Herath,et al.  High-sensitivity fiber-loop ringdown evanescent-field index sensors using single-mode fiber. , 2010, Optics letters.

[12]  Yong-xing Jin,et al.  Magneto-optical fiber sensor based on bandgap effect of photonic crystal fiber infiltrated with magnetic fluid , 2012 .

[13]  Hao Zhang,et al.  Tilted fiber Bragg gratings: Principle and sensing applications , 2011 .

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

[15]  D. Thomson,et al.  Optical fiber refractometer using narrowband cladding-mode resonance shifts. , 2007, Applied optics.

[16]  Qida Zhao,et al.  Refractive index sensor based on measuring the transmission power of tilted fiber Bragg grating , 2009 .

[17]  C. C. Chan,et al.  Power-Referenced Optical Fiber Refractometer Based on a Hybrid Fiber Grating , 2011, IEEE Photonics Technology Letters.

[18]  Anbo Wang,et al.  In-fiber reflection mode interferometer based on a long-period grating for external refractive-index measurement. , 2005, Applied optics.