Journal ArticleDOI
High sensitivity of taper-based Mach–Zehnder interferometer embedded in a thinned optical fiber for refractive index sensing
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TLDR
The proposed MZIs have lower temperature sensitivities compared with normal fiber sensors, which is a desirable merit for RI sensors to reduce the cross sensitivity caused by thermal drift.Abstract:
A taper-based Mach–Zehnder interferometer (MZI) embedded in a thinned optical fiber is demonstrated as a highly sensitive refractive index (RI) sensor. A RI sensitivity of 2210.84 nm/RIU (refractive index unit) is obtained at the external RI of 1.40, which is ten times higher than that of normal taper- and long-period fiber grating (LPFG)-based sensors. The sensitivity can be further improved by decreasing the diameter of the thinned fiber and increasing the interferometer length of the MZI. The proposed MZIs have lower temperature sensitivities compared with normal fiber sensors, which is a desirable merit for RI sensors to reduce the cross sensitivity caused by thermal drift.read more
Citations
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Sensitivity characteristics of long-period fiber gratings
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High sensitivity and high Q-factor nanoslotted parallel quadrabeam photonic crystal cavity for real-time and label-free sensing
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High-Q and high-sensitivity width-modulated photonic crystal single nanobeam air-mode cavity for refractive index sensing
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Journal ArticleDOI
S-Tapered Fiber Sensors for Highly Sensitive Measurement of Refractive Index and Axial Strain
Rui Yang,Yong-Sen Yu,Chao Chen,Yang Xue,Xu-Lin Zhang,Jing-Chun Guo,Chuang Wang,Feng Zhu,Bao-Lin Zhang,Qi-Dai Chen,Hong-Bo Sun +10 more
TL;DR: An S-tapered fiber sensor has been realized on the common singlemode fiber by a fusion splicer as discussed by the authors, which can be considered as a compact fiber Mach-Zehnder interferometer with the total length of hundreds of microns.
References
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Journal ArticleDOI
Optical fiber long-period grating sensors.
TL;DR: A novel class of highly sensitive sensors based on long-period fiber gratings that can be implemented with simple and inexpensive demodulation schemes are presented.
Journal ArticleDOI
Sensitivity characteristics of long-period fiber gratings
Xuewen Shu,Lin Zhang,Ian Bennion +2 more
TL;DR: In this paper, the sensitivity of long-period fiber gratings (LPFGs) is investigated as a function of temperature, strain, and surrounding refractive index, with particular attention to the higher order cladding modes and the possibilities for ultrasensitive sensors.
Journal ArticleDOI
Tapered fiber Mach–Zehnder interferometer for simultaneous measurement of refractive index and temperature
TL;DR: In this paper, an approach to achieve simultaneous measurement of refractive index and temperature is proposed by using a Mach-Zehnder interferometer realized on tapered single-mode optical fiber.
Journal ArticleDOI
Refractive Index Sensing With Mach–Zehnder Interferometer Based on Concatenating Two Single-Mode Fiber Tapers
Zhaobing Tian,Scott S.-H. Yam,Jack A. Barnes,Wojtek J. Bock,P. Greig,James M. Fraser,Hans-Peter Loock,Richard D. Oleschuk +7 more
TL;DR: In this paper, a fiber Mach-Zehnder interferometer was realized by concatenating two singlemode fiber tapers separated by a middle section, which had a minimum insertion loss of 3 dB and maximum interferometric extinction ratio over 20 dB.
Journal ArticleDOI
Thinned fiber Bragg gratings as high sensitivity refractive index sensor
TL;DR: In this paper, the numerical and experimental analysis on the use of thinned fiber Bragg gratings as refractive index sensors have been carried out, where wet chemical etching in a buffered hydrofluoric acid solution was used for sensor fabrication.