Long-period grating based single-mode fiber to multi-core fiber pump coupler

2020 ◽  
Author(s):  
Liliana M. Sousa ◽  
Margarida Facão ◽  
Gil M. Fernandes ◽  
Rogério N. Nogueira ◽  
Ana M. Rocha
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Long Period Grating ◽  
Long Period ◽  
Core Fiber

Long-period grating fabricated by periodically tapering standard single-mode fiber

2008 ◽  
Vol 47 (10) ◽  
pp. 1549 ◽  
Author(s):  
Li-Yang Shao ◽  
Jian Zhao ◽  
Xinyong Dong ◽  
H. Y. Tam ◽  
C. Lu ◽  
...  
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Long Period Grating ◽  
Long Period

Fiber-optic Michelson interferometer based on α-Fe2O3/ZrO2 sensing membrane and its application in trace fluoride-ion detection

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Zizheng Yue ◽  
Wenlin Feng
Keyword(s):  
Silver Film ◽  
Fiber Optic ◽  
Michelson Interferometer ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Ion Concentration ◽  
Fluoride Ion ◽  
Ion Detection ◽  
Core Fiber ◽  
Sensing Membrane

Abstract In this work, a fiber-optic fluoride-ion-detection Michelson interferometer based on the thin-core fiber (TCF) and no-core fiber (NCF) coated with α-Fe2O3/ZrO2 sensing film is proposed and presented. The single-mode fiber (SMF) is spliced with the TCF and NCF in turn, and a waist-enlarged taper is spliced between them. Then, a silver film is plated on the end face of NCF to enhance the reflection. After the absorption of fluoride ion by the sensing film, the effective refractive index (RI) of the coated cladding will change, which leads to the regular red shift of the interference dip with the increasing fluoride-ion concentration. Thus, the fluoride-ion concentrations can be determined according to the corresponding dip wavelength shifts. The results show that the sensor has an excellent linear response (R 2 = 0.995) with good sensitivity (8.970 nm/ppm) when the fluoride-ion concentration is in the range of 0–1.5 ppm. The response time is about 15 s. The sensor has the advantage of good selectivity, good temperature and pH stabilities, and can be applied to detect fluoride ion effectively.

Michelson liquid-level sensor based on cascaded no-core fiber and single-mode fiber structure

Optik ◽  
2020 ◽  
Vol 206 ◽  
pp. 163746 ◽  
Author(s):  
Dejiu Feng ◽  
Min Liu ◽  
Wenlin Feng ◽  
Bangxing Li
Keyword(s):  
Single Mode ◽  
Single Mode Fiber ◽  
Liquid Level ◽  
Fiber Structure ◽  
Level Sensor ◽  
Core Fiber ◽  
Liquid Level Sensor

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.

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