scholarly journals Multimode interference in tapered single mode-multimode-single mode fiber structures for strain sensing applications

2012 ◽  
Author(s):  
Ricardo M. André ◽  
Claudecir R. Biazoli ◽  
Susana O. Silva ◽  
Manuel B. Marques ◽  
Cristiano M. B. Cordeiro ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Multimode Interference ◽  
Strain Sensing ◽  
Sensing Applications

scholarly journals Ultrashort Long-Period Fiber Gratings Inscribed on a Single-Mode Fiber for Torsion Sensing Applications

2018 ◽  
Vol 2018 ◽  
pp. 1-6 ◽  
Author(s):  
Marta Nespereira ◽  
João M. P. Coelho ◽  
José Manuel Rebordão
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Wavelength Shift ◽  
Fiber Grating ◽  
Long Period ◽  
Sensing Applications ◽  
High Tension ◽  
Long Period Fiber Gratings ◽  
Order Of Magnitude ◽  
Period Fiber Grating

The response of ultrashort-length CO2-induced long-period fiber grating (LPFG) sensors to torsion is reported. While engraving using CO2 laser radiation, the fiber is submitted to high tension allowing the obtainment of gratings with shorter lengths, down to 2.4 mm, which is almost one order of magnitude lower than the usual. Also, the fiber is only irradiated in one side, creating an asymmetrical profile leading to highly birefringent gratings. Sensitivity to axial twists is demonstrated, with values up to 0.15 nm/(rad/m) for the resonant wavelength shift and higher than 0.03 dBm/(rad/m) for the variation in the intensity (attenuation). Discrimination between rotation directions, clockwise and counterclockwise, was observed.

Experimental Research of Strain and Temperature Based on EFPI Sensor

2011 ◽  
Vol 130-134 ◽  
pp. 4185-4188
Author(s):  
Xiu Feng Yang ◽  
Chun Yu Zhang ◽  
Zheng Rong Tong
Keyword(s):  
Low Cost ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Good Reliability ◽  
High Repetition ◽  
Sensing Applications ◽  
Fabry Perot ◽  
Wet Chemical ◽  
The Many ◽  
Multi Mode

An extrinsic Fabry-Perot (F-P) interferometric (EFPI) sensor by using simple etching and fusing method is proposed and demonstrated. The cavity is formed by wet chemical etching of multi-mode fiber (MMF) end face in hydrofluoric acid solutions, and then it is fused to the end of a single-mode fiber (SMF) to form an extrinsic F-P structure. The strain and temperature of EFPI sensor are studied experimentally. The experimental results show that the interference wavelength becomes 2.648nm longer while the strain increases from 0N to 637N, and the strain sensitivity is about 0.004nm/N, and linearity is 0.999. The interference wavelength becomes 0.032nm shorter while the temperature increases from 20°C to 100°C. This kind of sensor has the many advantages of easy fabrication, good reliability, high-repetition, small size, low cost and mass-production, which offers great prospect for sensing applications.

UV exposure on a single-mode fiber within a multimode interference structure

2014 ◽  
Vol 39 (22) ◽  
pp. 6521 ◽  
Author(s):  
Qiang Wu ◽  
Jinhui Yuan ◽  
Chongxiu Yu ◽  
Xinzhu Sang ◽  
Lipeng Sun ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Uv Exposure ◽  
Multimode Interference ◽  
Interference Structure

Note: Improving distributed strain sensing sensitivity in OFDR by reduced-cladding single mode fiber

2016 ◽  
Vol 87 (12) ◽  
pp. 126106 ◽  
Author(s):  
Zhenyang Ding ◽  
Di Yang ◽  
Yang Du ◽  
Yonghan Zhou ◽  
Zhexi Xu ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Strain Sensing ◽  
Distributed Strain ◽  
Sensing Sensitivity

Simultaneous Temperature and Strain Sensing Based on M-Shaped Single Mode Fiber

2017 ◽  
Vol 29 (22) ◽  
pp. 1955-1958 ◽  
Author(s):  
Yue Dong ◽  
Guobin Ren ◽  
Han Xiao ◽  
Yixiao Gao ◽  
Haisu Li ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Strain Sensing

scholarly journals Splicing and Coupling Losses in Hollow-Core Photonic Crystal Glass Fibers

2010 ◽  
Vol 161 ◽  
pp. 43-49 ◽  
Author(s):  
J.P. Carvalho ◽  
F. Magalhães ◽  
O. Frazão ◽  
J.L. Santos ◽  
F.M. Araújo ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Gas Sensing ◽  
Glass Fibers ◽  
Effective Diffusion ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Crystal Glass ◽  
Hollow Core ◽  
Sensing Applications ◽  
Core Fiber

Hollow-core photonic crystal glass fibers have a high potential for gas sensing applications, since large light-gas interaction lengths can be effectively attained. Nevertheless, in order to enhance effective diffusion of gas into the hollow-core fiber, multi-coupling gaps are often needed, which raise coupling loss issues that must be evaluated prior to the development of practical systems. In this paper, a study on the coupling losses dependence on lateral and axial gap misalignment for single-mode fiber and two different types of hollow-core photonic crystal glass fibers is carried out. In addition, an experimental technique on splicing these glass fibers is also described and some results are presented showing that low splice losses can be obtained with high reproducibility.

Long-Period Gratings and Multimode Interference in Helical Single-Mode Fiber

2019 ◽  
Vol 31 (24) ◽  
pp. 1956-1959
Author(s):  
Boyao Li ◽  
Ran Xia ◽  
Perry Ping Shum ◽  
Guiyao Zhou
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Multimode Interference ◽  
Long Period ◽  
Long Period Gratings
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