Adiabatic fiber microtaper with incorporated an air-gap microcavity fiber Fabry-Pérot interferometer

This study demonstrates an adiabatic fiber microtaper with incorporated an air-gap microcavity fiber-Fabry-Perot-interferometer to perform superior sensing characteristics. Optical interference fringes with good fringes contrast within bandwidth of 1250–1650 nm are performed experimentally. A highly spectral sensitivity of peak power with +3.65 dB/ °C (+9759 dB/RIU) is achieved when the device is operated under a fundamental-mode-cutoff (FMC) condition. By measuring peak power of the fringe, one can determine the temperature (T) or refractive index of environment. The proposed hybrid sensor is further applied to measure high T (∼1000 °C) of surrounding in non-FMC condition that obtains a good linearity of spectral response.

[1]  Cheng-Ling Lee,et al.  Leakage coupling of ultrasensitive periodical silica thin-film long-period grating coated on tapered fiber. , 2010, Optics letters.

[2]  T. K. Gangopadhyay,et al.  Vibration: history and measurement with an extrinsic Fabry-Perot sensor with solid-state laser interferometry. , 1999, Applied optics.

[3]  Anbo Wang,et al.  Simultaneous measurement of refractive index and temperature based on a reflection-mode long-period grating and an intrinsic Fabry-Perot interferometer sensor. , 2005, Optics letters.

[4]  S. Kawakami,et al.  Beam expanding fiber using thermal diffusion of the dopant , 1990 .

[5]  William J. Wadsworth,et al.  Supercontinuum generation in tapered fibers. , 2000, Optics letters.

[6]  T. K. Gangopadhyay,et al.  Non-contact vibration measurement based on an extrinsic Fabry–Perot interferometer implemented using arrays of single-mode fibres , 2004 .

[7]  N. Díaz-Herrera,et al.  A fibre-optic temperature sensor based on the deposition of a thermochromic material on an adiabatic taper , 2004 .

[8]  Cheng-Ling Lee.  Spectral analysis of waveguide tapered microfiber with an ultrathin metal coating. , 2010, Optics express.

[9]  Wei Jin,et al.  Long-period gratings in wavelength-scale microfibers. , 2010, Optics letters.

[10]  Cheng-Ling Lee,et al.  Hybrid AG-FFPI/RLPFG for Simultaneously Sensing Refractive Index and Temperature , 2011, IEEE Photonics Technology Letters.

[11]  M. Sumetsky,et al.  Optical microfiber loop resonator , 2005, (CLEO). Conference on Lasers and Electro-Optics, 2005..

[12]  Richard J. Black,et al.  Tapered single-mode fibres and devices. I. Adiabaticity criteria , 1991 .