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Photonics
Special Issues
Optical Fibers and Sensing
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Optical Fibers and Sensing

A special issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: closed (15 July 2022) | Viewed by 5039

Special Issue Editors

Dr. Fabio Mangini

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Guest Editor
Department of Information Engineering, University of Brescia, Via Branze 59, 25123 Brescia, Italy
Interests: electromagnetic scattering; optical fiber; fMRI
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Jianzhong Zhang

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Guest Editor
College of Science, Harbin Engineering University, Harbin 150001, China
Interests: optical fibre devices; optical fibre sensing; optical glasses and optical nanomaterials
Special Issues, Collections and Topics in MDPI journals
Dr. Jun Long Lim

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Guest Editor
Agency for Science, Technology and Research, Institute for Infocomm Research, Singapore
Interests: optical fiber sensor; specialty optical fiber; fiber Bragg gratings; photonics waveguide; harsh environment sensing; aging healthcare
Special Issues, Collections and Topics in MDPI journals
Prof. Dr. Ching-Hung Chang

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Guest Editor
Department of Electrical Machinery, National Chiayi University, Chiayi, Taiwan
Interests: optical fiber transport systems; radio over fiber transport systems; fiber sensors; optical fiber sensor networks
Dr. Qingwen Liu

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Guest Editor
School of Electronic Information and Electrical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
Interests: fiber-optic sensors and applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Optical fiber sensing has become an important national information infrastructure, laying the foundation for the development of smart cities, and supporting the development of strategic emerging industries such as the Internet of Things, cloud computing, and big data. This is creating a demand for custom designed optical fiber sensors and sensing systems. Researchers both in academia and industry continue to explore and develop new optical fiber sensing technologies, aiming to continuously improve optical fiber sensing technologies and break through application fields.

This Special Issue aims to highlight a wide range of optical fiber sensing technologies and well as their applications, including but not limited to:

  • specialty optical fibers, devices designed and fabricated for sensing applications;
  • distributed or discrete optical fiber sensing network architectures and interrogation technology;
  • optical fiber sensing application in industrial, mechanical, oil and gas, environmental, biological, medical or defense;
  • fiber sensing data processing based on machine learning or artificial intelligence.

We hope to present the latest advances and future directions in optics fiber sensing through this Special Issue and facilitate communication between various universities and research teams at the same time.

Dr. Fabio Mangini
Prof. Dr. Jianzhong Zhang
Dr. Jun Long Lim
Prof. Dr. Ching-Hung Chang
Dr. Qingwen Liu
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.

Keywords

  • specialty optical fiber
  • fiber lasers
  • (FBGs)
  • optical fiber sensors
  • distributed fiber sensing
  • optical fiber manufacture
  • remote sensing
  • fiber sensing signal processing

Published Papers (2 papers)

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11 pages, 3538 KiB  
Article
Actively Mode Locked Raman Fiber Laser with Multimode LD Pumping
by Alexey G. Kuznetsov, Sergey I. Kablukov, Yuri A. Timirtdinov and Sergey A. Babin
Photonics 2022, 9(8), 539; https://doi.org/10.3390/photonics9080539 - 01 Aug 2022
Cited by 2 | Viewed by 1881
Abstract
We present our recent experimental results on the pulsed regimes of Raman conversion of highly multimode laser diode (LD) pump radiation into the 1st and higher order Stokes radiation in multimode graded-index fibers. Three different linear cavities of Raman fiber laser with the [...] Read more.
We present our recent experimental results on the pulsed regimes of Raman conversion of highly multimode laser diode (LD) pump radiation into the 1st and higher order Stokes radiation in multimode graded-index fibers. Three different linear cavities of Raman fiber laser with the modulation of losses (by acousto-optic modulator, AOM) or gain (by LD current) are explored and compared. An LD with wavelength of 976 nm is used for pumping enabling Raman lasing at wavelength of the 1st (1018 nm) and 2nd (1064 nm) Stokes orders. At ~27.2-kHz repetition rate corresponding to the laser cavity round-trip frequency (i.e., in the mode-locking regime), nanosecond pulses have been observed for both Stokes orders having the highest peak power of ~300 W in the scheme with bulk AOM and the shortest duration of 5–7 ns in the scheme with fiber-pigtailed AOM. At the same time, the beam quality of generated pulses is greatly improved as compared to that for pump diode (M2 > 20) reaching the best value (M2 = 2.05) for the 2nd order Stokes beam in the scheme with the gain modulation and demonstrating also the most stable regime. Full article
(This article belongs to the Special Issue Optical Fibers and Sensing)
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13 pages, 1798 KiB  
Article
FPGA-Based Dynamic Wavelength Interrogation System for Thousands of Identical FBG Sensors
by Jiaqi Wang, Xuelei Fu, Hui Gao, Xin Gui, Honghai Wang and Zhengying Li
Photonics 2022, 9(2), 79; https://doi.org/10.3390/photonics9020079 - 29 Jan 2022
Cited by 3 | Viewed by 2607
Abstract
Under realistic scenarios, more fiber Bragg gratings (FBGs) are always expected to be multiplexed in one sensor array to share the expensive optical components and electrical devices. However, either the sensing number or the interrogation frequency is limited in previous works due to [...] Read more.
Under realistic scenarios, more fiber Bragg gratings (FBGs) are always expected to be multiplexed in one sensor array to share the expensive optical components and electrical devices. However, either the sensing number or the interrogation frequency is limited in previous works due to the huge amount of data generated from large-scale sensing arrays. This paper presents a field-programmable gate array (FPGA)-based dynamic wavelength interrogation system for thousands of identical FBGs. With the advantages of parallel controlling and pipeline processing, FPGA can accelerate the data-processing rate of the wavelength interrogation, realizing a continuous-running and real-time sensing system. The signal-processing system precisely synchronizes the generation of interrogation pulses, the acquisition of reflected signals, and the processing of the wavelength-related data, making the interrogation frequency fundamentally limited by the round-trip time of light pulses traveling in the fiber. Multiple sensing arrays can be independently carried out simultaneously, affecting hardly the interrogation frequency. Experimental results show that over 4000 FBGs with a 3-m spatial resolution in four channels are interrogated with a 150-Hz sensing frequency, 3-nm dynamic range, and ±5.9-pm sensing precision, greatly improving the interrogation frequency while ensuring the multiplexing number. Full article
(This article belongs to the Special Issue Optical Fibers and Sensing)
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