scholarly journals Experimental Study on the Concept of Hollow-Core Photonic Bandgap Fiber Stethoscope

2018 ◽  
Vol 2018 ◽  
pp. 1-4
Author(s):  
Adel Abdallah
Keyword(s):  
Experimental Study ◽  
Relative Phase ◽  
Fiber Optic ◽  
Photonic Bandgap ◽  
Single Mode ◽  
Hollow Core ◽  
Photonic Bandgap Fiber ◽  
Photonic Bandgap Fibers ◽  
Relative Phase Shift ◽  
Phase Generated Carrier

An experiment is proposed to show the feasibility of using hollow-core photonic bandgap fibers (HC-PBF) in the fiber-optic interferometric stethoscopes to generally improve the sensitivity and overcome the problems associated with the electronic stethoscopes. In the experiment, the HC-1550 is used as a measuring arm of an unbalanced Mach-Zehnder interferometer (MZI) and the conventional single-mode optical fiber (SMF) is used as an isolated reference arm. Detection and demodulation of the relative phase shift is performed passively using phase-generated carrier homodyne technique (PGC). The proposed results indicate the significance of using HC-PBFs in the future stethoscopes.

A Single-Mode Polarization Maintaining Hollow Core Photonic Bandgap Fiber

2016 ◽  
Vol 28 (22) ◽  
pp. 2617-2620 ◽  
Author(s):  
Kan Chen ◽  
Chenge Wang ◽  
Huizhu Hu ◽  
Xiaowu Shu ◽  
Cheng Liu
Keyword(s):  
Photonic Bandgap ◽  
Single Mode ◽  
Hollow Core ◽  
Photonic Bandgap Fiber ◽  
Polarization Maintaining

scholarly journals Low-Loss Low-Back-Reflection Coupling of Hollow-Core Photonic Bandgap Fiber With Integrated-Optic Circuit in Fiber Optic Gyroscope

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 130979-130985
Author(s):  
Ningfang Song ◽  
Cheng He ◽  
Xiaobin Xu ◽  
Jiaqi Liu ◽  
Fuyu Gao ◽  
...  
Keyword(s):  
Fiber Optic ◽  
Photonic Bandgap ◽  
Low Back ◽  
Hollow Core ◽  
Fiber Optic Gyroscope ◽  
Low Loss ◽  
Photonic Bandgap Fiber ◽  
Back Reflection

Surface mode free and highly birefringent single-mode hollow core photonic bandgap fibers

2007 ◽  
Author(s):  
Stefano Selleri ◽  
Federica Poli ◽  
Matteo Foroni ◽  
Annamaria Cucinotta
Keyword(s):  
Photonic Bandgap ◽  
Single Mode ◽  
Surface Mode ◽  
Hollow Core ◽  
Photonic Bandgap Fibers

scholarly journals Investigation on the Effect of Underwater Acoustic Pressure on the Fundamental Mode of Hollow-Core Photonic Bandgap Fibers

2015 ◽  
Vol 2015 ◽  
pp. 1-7 ◽  
Author(s):  
Adel Abdallah ◽  
Zhang Chaozhu ◽  
Zhong Zhi
Keyword(s):  
Fundamental Mode ◽  
Communication Systems ◽  
Acoustic Pressure ◽  
Photonic Bandgap ◽  
Pressure Sensors ◽  
Numerical Aperture ◽  
Single Mode ◽  
Hollow Core ◽  
Underwater Acoustic ◽  
Photonic Bandgap Fibers

Recently, microstructured optical fibers have become the subject of extensive research as they can be employed in many civilian and military applications. One of the recent areas of research is to enhance the normalized responsivity (NR) to acoustic pressure of the optical fiber hydrophones by replacing the conventional single mode fibers (SMFs) with hollow-core photonic bandgap fibers (HC-PBFs). However, this needs further investigation. In order to fully understand the feasibility of using HC-PBFs as acoustic pressure sensors and in underwater communication systems, it is important to study their modal properties in this environment. In this paper, the finite element solver (FES) COMSOL Multiphysics is used to study the effect of underwater acoustic pressure on the effective refractive indexneffof the fundamental mode and discuss its contribution to NR. Besides, we investigate, for the first time to our knowledge, the effect of underwater acoustic pressure on the effective areaAeffand the numerical aperture (NA) of the HC-PBF.

scholarly journals Robustly single mode hollow core photonic bandgap fiber

2008 ◽  
Vol 16 (6) ◽  
pp. 4337 ◽  
Author(s):  
M. N. Petrovich ◽  
F. Poletti ◽  
A. van Brakel ◽  
D. J. Richardson
Keyword(s):  
Photonic Bandgap ◽  
Single Mode ◽  
Hollow Core ◽  
Photonic Bandgap Fiber

scholarly journals Realization of Low Confinement Loss Acetylene Gas Sensor by Using Hollow-core Photonic Bandgap Fiber 

2021 ◽  
Author(s):  
Hassan Arman ◽  
Saeed Olyaee
Keyword(s):  
Gas Sensor ◽  
Photonic Bandgap ◽  
Single Mode ◽  
Relative Sensitivity ◽  
Gas Absorption ◽  
Confinement Loss ◽  
Core Radius ◽  
Hollow Core ◽  
Photonic Bandgap Fiber ◽  
Mode Interference

Abstract A hollow-core photonic bandgap fiber (HC-PBF) with high relative sensitivity and low confinement loss was designed. Some destructive circumstance such as propagation losses and mode interference can disrupt performance of the PBF. By considering optimum size of the hollow-core radius, we were able to improve confinement loss and the relative sensitivity. By optimization of the shape and size of the closest row of air holes to the hollow core, the quality of the mode distribution in the hollow-core was well improved. Simulation results confirm that, at an optimal and reasonable core radius, the relative sensitivity and confinement loss of the proposed gas sensor were improved to 96.5% and 0.11 dB/m, respectively. In addition, in order to better matching of optical power between single mode fiber (SMF) and HC-PBF, we could reduce the destructive effects of optical mode mismatch, by mode interference suppression. Furthermore, by optimization of fiber structural specifications such as air filling fraction and lattice constant, the PBF was changed to a single-mode waveguide. Considering the operation wavelength 1530 nm which is very close to the acetylene gas absorption wavelength, this fiber is appropriate to be a high sensitivity gas sensor to detect absorbing gases in the middle infrared range.

Model Analysis of Underwater Acoustic Sensing with Hollow-Core Photonic Bandgap Fiber

2014 ◽  
Vol 568-570 ◽  
pp. 581-589
Author(s):  
Adel Abdallah ◽  
Chao Zhu Zhang ◽  
Zhi Zhong
Keyword(s):  
Acoustic Pressure ◽  
Photonic Bandgap ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Elastic Model ◽  
Hollow Core ◽  
Detection Range ◽  
Acoustic Sensing ◽  
Underwater Acoustic ◽  
Photonic Bandgap Fiber

Recently, using hollow-core photonic bandgap fiber (HC-PBF) for underwater acoustic sensing has been tested experimentally. Besides its unique characteristics and advantages over conventional single mode fiber (SMF), it provides higher responsivity to acoustic pressure. A robust deep water ray tracing model for multipath acoustic signals propagation and the elastic model of HC-PBF are both required to study the effects of underwater enviroment on the propagating acoustic signal for sensing with HC-PBF hydrophones. The combination of the two models allows studying the frequency response, sensitivity, detection range, and maximum operating depth of the HC-PBF hydrophones. The models analysis and simulations show the considerations that must be taken into account for the design and field operation of the HC-PBF hydrophones. In this paper, a complete package to study, design, optimize, and analyze the simulation results of the interferometric HC-PBF hydrophones is proposed.

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