scholarly journals Negative Curvature Hollow Core Fiber Based All-Fiber Interferometer and Its Sensing Applications to Temperature and Strain

Sensors ◽  
2020 ◽  
Vol 20 (17) ◽  
pp. 4763
Author(s):  
Dejun Liu ◽  
Wei Li ◽  
Qiang Wu ◽  
Haoyu Zhao ◽  
Fengzi Ling ◽  
...  
Keyword(s):  
Negative Curvature ◽  
Free Spectral Range ◽  
Extinction Ratio ◽  
Characteristic Matrix ◽  
Hollow Core ◽  
Sensing Applications ◽  
Sensor Structure ◽  
Core Fiber ◽  
Two Parameters ◽  
Periodic Transmission

Negative curvature hollow core fiber (NCHCF) is a promising candidate for sensing applications; however, research on NCHCF based fiber sensors starts only in the recent two years. In this work, an all-fiber interferometer based on an NCHCF structure is proposed for the first time. The interferometer was fabricated by simple fusion splicing of a short section of an NCHCF between two singlemode fibers (SMFs). Both simulation and experimental results show that multiple modes and modal interferences are excited within the NCHCF structure. Periodic transmission dips with high spectral extinction ratio (up to 30 dB) and wide free spectral range (FSR) are produced, which is mainly introduced by the modes coupling between HE11 and HE12. A small portion of light guiding by means of Anti-resonant reflecting optical waveguide (ARROW) mechanism is also observed. The transmission dips, resulting from multimode interferences (MMI) and ARROW effect have a big difference in sensitivities to strain and temperature, thus making it possible to monitor these two parameters with a single sensor head by using a characteristic matrix approach. In addition, the proposed sensor structure is experimentally proven to have a good reproducibility.

scholarly journals Antiresonant Hollow-Core Fiber-Based Dual Gas Sensor for Detection of Methane and Carbon Dioxide in the Near- and Mid-Infrared Regions

Sensors ◽  
2020 ◽  
Vol 20 (14) ◽  
pp. 3813 ◽  
Author(s):  
Piotr Jaworski ◽  
Paweł Kozioł ◽  
Karol Krzempek ◽  
Dakun Wu ◽  
Fei Yu ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Gas Sensor ◽  
Gas Sensing ◽  
Simultaneous Detection ◽  
Hollow Core ◽  
Mid Infrared ◽  
Sensing Applications ◽  
Core Fiber ◽  
Sensor Configuration ◽  
Carbon Dioxide Co2

In this work, we present for the first time a laser-based dual gas sensor utilizing a silica-based Antiresonant Hollow-Core Fiber (ARHCF) operating in the Near- and Mid-Infrared spectral region. A 1-m-long fiber with an 84-µm diameter air-core was implemented as a low-volume absorption cell in a sensor configuration utilizing the simple and well-known Wavelength Modulation Spectroscopy (WMS) method. The fiber was filled with a mixture of methane (CH4) and carbon dioxide (CO2), and a simultaneous detection of both gases was demonstrated targeting their transitions at 3.334 µm and 1.574 µm, respectively. Due to excellent guidance properties of the fiber and low background noise, the proposed sensor reached a detection limit down to 24 parts-per-billion by volume for CH4 and 144 parts-per-million by volume for CO2. The obtained results confirm the suitability of ARHCF for efficient use in gas sensing applications for over a broad spectral range. Thanks to the demonstrated low loss, such fibers with lengths of over one meter can be used for increasing the laser-gas molecules interaction path, substituting bulk optics-based multipass cells, while delivering required flexibility, compactness, reliability and enhancement in the sensor’s sensitivity.

Acoustic sensitivity of the negative curvature hollow core fiber

2014 ◽  
Author(s):  
S.N. Turtaev ◽  
M.I. Belovolov ◽  
A.E. Levchenko ◽  
A. F. Kosolapov ◽  
A. D. Pryamikov ◽  
...  
Keyword(s):  
Negative Curvature ◽  
Hollow Core ◽  
Core Fiber ◽  
Acoustic Sensitivity

scholarly journals Dispersion measurement of microstructured negative curvature hollow core fiber

2016 ◽  
Vol 55 (11) ◽  
pp. 116106 ◽  
Author(s):  
Richard M. Carter ◽  
William N. MacPherson ◽  
Piotr Jaworski ◽  
Fei Yu ◽  
Rainer Beck ◽  
...  
Keyword(s):  
Negative Curvature ◽  
Hollow Core ◽  
Dispersion Measurement ◽  
Core Fiber

Single-polarization single-mode hollow-core negative curvature fiber with nested U-type cladding elements

2021 ◽  
Author(s):  
Qiwei Wang ◽  
Shi Qiu ◽  
Jinhui Yuan ◽  
Guiyao Zhou ◽  
Changming Xia ◽  
...  
Keyword(s):  
Negative Curvature ◽  
Extinction Ratio ◽  
Single Mode ◽  
High Order Mode ◽  
Confinement Loss ◽  
Structure Parameters ◽  
Hollow Core ◽  
Propagation Characteristics ◽  
Potential Applications ◽  
Single Polarization

Abstract Hollow-core negative curvature fibers (HC-NCFs) have become one of the research hotspots in the field of optical fiber because of its potential applications in the data and energy transmissions. In this paper, a new kind of single-polarization single-mode HC-NCF with nested U-type cladding elements is proposed. To achieve the single-polarization single-mode transmission, we use two different silica tube thicknesses that satisfy the resonance and anti-resonance conditions on the U-type cladding elements and the cladding tubes, respectively. Besides, the elliptical elements are introduced to achieve good single-mode performance. By studying the influences of the structure parameters on the propagation characteristics, the optimized structure parameters are obtained. The simulation results show that when the wavelength is located at 1550 nm, the single-polarization single-mode transmission is achieved, along with the polarization extinction ratio of 25749 and minimum high-order mode extinction ratio of 174. Furthermore, the confinement loss is only 0.0015 dB/m.

scholarly journals Light transmission in negative curvature hollow core fiber in extremely high material loss region

2013 ◽  
Vol 21 (8) ◽  
pp. 9514 ◽  
Author(s):  
Anton N. Kolyadin ◽  
Alexey F. Kosolapov ◽  
Andrey D. Pryamikov ◽  
Alexander S. Biriukov ◽  
Victor G. Plotnichenko ◽  
...  
Keyword(s):  
Negative Curvature ◽  
Light Transmission ◽  
Hollow Core ◽  
Material Loss ◽  
Core Fiber
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