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Photonics
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Fiber-Optic Sensors
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Fiber-Optic Sensors

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Optical Communication and Network".

Deadline for manuscript submissions: closed (31 March 2022) | Viewed by 12497

Special Issue Editors

Prof. Dr. Mehdi Shadaram

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Guest Editor
Department of Electrical and Computer Engineering, One UTSA Circle, San Antonio, TX 78249, USA
Interests: optical fiber communications and sensors; elastic optical networks; optical devices
Dr. Allen Moghadas

E-Mail Website
Guest Editor
General Atomics, 3550 General Atomics Court, San Diego, CA 92121, USA
Interests: photonics; FBG sensors; power distribution systems
Prof. Dr. Ahmed Musa

E-Mail Website
Guest Editor
Department of Telecommunication Engineering, Hijjawi Faculty for Engineering Technology, Yarmouk University, Irbid 21163, Jordan
Interests: optical communication; photonic devices

Special Issue Information

Dear Colleagues,

Fiber-optic sensors have been utilized in a variety photonic applications for last several decades. The purpose of this Special Issue (SP) is explore new findings and discoveries that  expand possibilities of fiber-optic sensors usage in a variety of applications. The applications and evolution of materials, technologies and methodologies that facilitates the fabrication and broadens the usage of fiber-optic sensors is the main motivation behind the creation of this SP. Original manuscript describing unpublished work not currently under review by any other journal are welcome. Papers may describe materials, fabrication methods, device design, modeling, simulation, experiment, optimization, emerging sensor technologies and applications that are related to fiber-optic sensors.

The list of topics includes:

  • New materials for fiber optic sensors;
  • Fabrication;
  • Modeling;
  • Emerging fiber-optic sensor technologies;
  • Fiber Bragg grating (FBG) devices as sensors;
  • Application of fiber-optic sensors in hazardous environments;
  • Methods for discrimination of temperature and strain effects in FBGs;
  • Nonlinear effects in fiber-optic sensors;
  • Distributed fiber-optic sensors and their applications;
  • Multiplexing methods;
  • Super structure FBG (SSFBG) devices and their applications.

Prof. Dr. Mehdi Shadaram
Dr. Allen Moghadas
Prof. Dr. Ahmed Musa
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All submissions that pass pre-check are peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Photonics is an international peer-reviewed open access monthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2400 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

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Published Papers (4 papers)

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Research

16 pages, 7938 KiB  
Article
An Improved Calibration Method to Determine the Strain Coefficient for Optical Fibre Sensing Cables
by Pengju An, Chaoqun Wei, Huiming Tang, Qinglu Deng, Bofan Yu and Kun Fang
Photonics 2021, 8(10), 429; https://doi.org/10.3390/photonics8100429 - 7 Oct 2021
Viewed by 2535
Abstract
The strain coefficient of an optical fibre sensing cable is a critical parameter for a distributed optical fibre sensing system. The conventional tensile load test method tends to underestimate the strain coefficient of sensing cables due to slippage or strain transfer loss at [...] Read more.
The strain coefficient of an optical fibre sensing cable is a critical parameter for a distributed optical fibre sensing system. The conventional tensile load test method tends to underestimate the strain coefficient of sensing cables due to slippage or strain transfer loss at the fixing points during the calibration procedure. By optimizing the conventional tensile load test setup, the true strain of a sensing cable can be determined by using two sets of displacement measuring equipment. Thus, the strain calculation error induced by slippage or strain transfer loss between a micrometre linear stage and sensing cable can be avoided. The performance of the improved calibration method was verified by using three types of sensing cables with different structures. In comparison to the conventional tensile load test method, the strain coefficients obtained by the improved calibration method for sensing cables A, B, and C increase by 1.52%, 2.06%, and 1.86%, respectively. Additionally, the calibration errors for the improved calibration method are discussed. The test results indicate that the improved calibration method has good practicability and enables inexperienced experimenters or facilities with limited equipment to perform precise strain coefficient calibration for optical fibre sensing cables. Full article
(This article belongs to the Special Issue Fiber-Optic Sensors)
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16 pages, 3834 KiB  
Article
Influence of Two-Frequency Radiation Intensity Fluctuations on the Output Signal of a Vortex Optical Fiber Forming OAM Address in Polyharmonic Sensor Technology
by Irina Vinogradova, Azat Gizatulin, Ivan Meshkov, Valery Bagmanov, Oleg Morozov, Ildaris Gabdulkhakov, Sofia Ganchevskaya, Nikolay Kazanskiy and Albert Sultanov
Photonics 2021, 8(9), 351; https://doi.org/10.3390/photonics8090351 - 25 Aug 2021
Cited by 4 | Viewed by 2477
Abstract
A schematic diagram of a RoF radio-optic system with vortex signals is presented, in which the radio frequency is determined by the difference between the wavelengths of two lasers. It is assumed that the generation of a vortex signal can be performed through [...] Read more.
A schematic diagram of a RoF radio-optic system with vortex signals is presented, in which the radio frequency is determined by the difference between the wavelengths of two lasers. It is assumed that the generation of a vortex signal can be performed through a vortex fiber-optic periodic structure, which can be obtained using a technology similar to the manufacture of long-period fiber Bragg gratings. The parameters of the grating are modeled assuming that the fundamental light-guide mode (LP01) is applied to the specified vortex element, and the higher-order mode (LP11) is reflected. It was found that the distortion of the vortex signal can be reduced by introducing apodization and chirping of this periodic structure. The following optimal parameters have been estimated: the apodization and chirp multiplier functions, at which the distortions of the amplitude and phase of the vortex signal, as well as the appearance of an unwanted angle distortion, will be minimal. It is shown that such gratings can be exploited in addressed sensors systems using the orbital angular momentum (OAM) of a lightwave as a unique sensor address. Full article
(This article belongs to the Special Issue Fiber-Optic Sensors)
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12 pages, 4008 KiB  
Article
Multichannel Fiber-Optic Silicon Fabry–Pérot Interferometric Bolometer System for Plasma Radiation Measurements
by Nezam Uddin, Qiwen Sheng, Seungsup Lee, Matthew L. Reinke, David Donovan, Morgan Shafer and Ming Han
Photonics 2021, 8(9), 344; https://doi.org/10.3390/photonics8090344 - 25 Aug 2021
Cited by 3 | Viewed by 2667
Abstract
A single-channel fiber-optic bolometer system based on a high-finesse silicon Fabry–Pérot interferometer (FPI) was previously reported, intended to measure plasma radiation from the magnetically confined fusion chamber. Recently, we developed a multichannel fiber-optic bolometer system with five bolometers multiplexed using a coarse wavelength [...] Read more.
A single-channel fiber-optic bolometer system based on a high-finesse silicon Fabry–Pérot interferometer (FPI) was previously reported, intended to measure plasma radiation from the magnetically confined fusion chamber. Recently, we developed a multichannel fiber-optic bolometer system with five bolometers multiplexed using a coarse wavelength division multiplexer (CWDM) and interrogated with a white-light system involving a superluminescent light-emission diode source and a high-speed spectrometer. One of the bolometers was used as the reference bolometer to compensate for the ambient temperature variations, and the other four bolometers were used for radiation measurement. The bolometers have a simple structure with a silicon pillar at the end of the single-mode fiber and a gold disk on the other side of the silicon pillar. They are also easy to fabricate without stringent requirements on the optical alignment. Analysis of the system optimization was performed to improve the noise performance and to mitigate the vibration effect that may present in the practical application. The system had a significantly enhanced measurement range compared to the previous high-finesse FPI bolometer system for measuring radiation. Test results performed in air using a 405 nm laser as the radiation source showed that the temperature resolution and the noise-equivalent power density of the sensing bolometers connected to each channel of the CWDM were, respectively, ~0.4 mK and ~0.1 W/m2, with a time constant of ~220 ms, which is comparable to the previous more complicated fiber-optic bolometer systems based on high-finesse FPIs that were interrogated using wavelength-scanning lasers. Full article
(This article belongs to the Special Issue Fiber-Optic Sensors)
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Graphical abstract

11 pages, 5557 KiB  
Communication
SOI-Based Multi-Channel AWG with Fiber Bragg Grating Sensing Interrogation System
by Siming Weng, Pei Yuan, Wei Zhuang, Dongliang Zhang, Fei Luo and Lianqing Zhu
Photonics 2021, 8(6), 214; https://doi.org/10.3390/photonics8060214 - 10 Jun 2021
Cited by 19 | Viewed by 3970
Abstract
For the development of minimized and high-rate photonic-integrated fiber Bragg grating interrogation (FBGI) systems, arrayed waveguide grating (AWG) has been widely used as one of the critical components. In this paper, we present an 8-channel SOI-based AWG for a photonic integrated FBG interrogation [...] Read more.
For the development of minimized and high-rate photonic-integrated fiber Bragg grating interrogation (FBGI) systems, arrayed waveguide grating (AWG) has been widely used as one of the critical components. In this paper, we present an 8-channel SOI-based AWG for a photonic integrated FBG interrogation microsystem. The channel spacing of the AWG is designed to be 3 nm to meet a high-dynamic-range demodulation requirement. The core size of the fabricated AWG is about 335 × 335 μm2. The simulation results and experimental results are in high agreement, showing that AWG has a fine transmission spectrum with crosstalk below −16 dB, nonuniformity below 0.4 dB, insertion loss below −6.35 dB, 3 dB bandwidth about 1.3 nm and 10 dB bandwidth of 2.3 nm. The proposed AWG can be applied perfectly to the SOI-based AWG demodulation microsystem, exhibiting a large dynamic range of 1.2 nm, the resolution for measurements is 1.27 pm and a high accuracy of 20.6 pm. Full article
(This article belongs to the Special Issue Fiber-Optic Sensors)
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