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Photonics
Special Issues
Advancements in Optical Fiber Sensing
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Advancements in Optical Fiber Sensing

A special issue of Photonics (ISSN 2304-6732). This special issue belongs to the section "Lasers, Light Sources and Sensors".

Deadline for manuscript submissions: 20 July 2025 | Viewed by 1530

Special Issue Editors

Prof. Dr. Yiping Wang

E-Mail Website
Guest Editor
School of Computer and Electronic Information, Nanjing Normal University, No.1 Wenyuan Road, Nanjing 210023, China
Interests: optical fiber sensing; fiber grating sensor; optical fiber sensing demodulation technology; microwave photonics; microwave photonics sensing
Dr. Qiang Liu

E-Mail Website
Guest Editor
School of Computer and Electronic Information, Nanjing Normal University, No.1 Wenyuan Road, Nanjing 210023, China
Interests: fiber optic sensing; interferometric sensor; demodulation algorithm; dynamic multi-parameter detection; optical fiber sensor network

Special Issue Information

Dear Colleagues,

Optical fiber sensing is a new sensing technology that uses optical waves as the carrier and optical fibers as the medium to sense and transmit external measurement signals. It has attracted tremendous attention over the past few decades due to its small size, light weight, resistance to electromagnetic interference, chemical resistance, and remote sensing ability. Optical fiber sensors can detect changes in temperature, pressure, strain, and other parameters by using the physical properties of light as it travels through an optical fiber. Recently, with the increase in the requirement of high-performance measurement, optical fiber sensing is also constantly evolving. The development of distributed fiber optic sensing technology makes continuous monitoring possible and provides an effective means for the health monitoring of large structures. The construction of fiber optic sensing network, combined with big data analysis, can achieve the real-time monitoring of the complex environment. Advances in micro–nano processing technology include making miniaturized fiber optic sensors, integrating direction, and improving the overall performance of the system and application flexibility. In addition, the introduction of technologies like microwave photonics, artificial intelligence (AI) algorithms, new specialty fibers has further improved the performance of fiber optic sensors, including enhanced stability and resolution and a wider dynamic range. This Special Issue will focus on the advancements in the optical fiber sensor technology and application. The topics of interest include the following:

  1. Fiber optic physical, mechanical, electromagnetic, biological, chemical, and medical sensors;
  2. Micro- and nano-structured fiber sensors;
  3. New optical fiber and its application;
  4. Fiber grating sensor;
  5. Distributed and multiplexed sensing and sensor networking;
  6. Interferometric, polarimetric, and laser-based sensors;
  7. New technology and application of optical fiber sensing;
  8. Artificial intelligence (AI)-assisted optical fiber sensors.

Prof. Dr. Yiping Wang
Dr. Qiang 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

  • optical fiber sensing
  • fiber grating sensor
  • new optical fiber and its application

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Published Papers (2 papers)

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Research

14 pages, 3906 KiB  
Article
Real-Time Respiratory Monitoring Using a Sparse-Sampled Frequency-Scanning White-Light Interferometry System
by Wenyan Liu, Cheng Qian, Kexin Li, Yiping Wang, Xiaoyan Cai and Qiang Liu
Photonics 2025, 12(1), 45; https://doi.org/10.3390/photonics12010045 - 6 Jan 2025
Viewed by 730
Abstract
Fiber-optic tip sensors offer significant potential in biomedical applications due to their high sensitivity, compact size, and resistance to electromagnetic interference. This study focuses on advancing phase demodulation techniques for ultra-short Fabry–Pérot cavities within limited spectral bandwidths to enhance their application in biomedicine [...] Read more.
Fiber-optic tip sensors offer significant potential in biomedical applications due to their high sensitivity, compact size, and resistance to electromagnetic interference. This study focuses on advancing phase demodulation techniques for ultra-short Fabry–Pérot cavities within limited spectral bandwidths to enhance their application in biomedicine and diagnostics. We propose a novel sparse-sampled white-light interferometry system for respiratory monitoring, utilizing a monolithic integrated semiconductor tunable laser for quasi-continuous frequency scanning across 191.2–196.15 THz at a sampling rate of 5 kHz. A four-step phase-shifting algorithm (PSA) ensures precise phase demodulation, enabling high sensitivity for short-cavity fiber-optic sensors under constrained spectral bandwidth conditions. Humidity sensors fabricated via a self-growing polymerization process further enhance the system’s functionality. The experimental results demonstrate the system’s capability to accurately capture diverse breathing patterns—including normal, rapid, and deep states—with fast response and recovery times. These findings establish the system’s potential for real-time respiratory monitoring in clinical and point-of-care settings. Full article
(This article belongs to the Special Issue Advancements in Optical Fiber Sensing)
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12 pages, 7877 KiB  
Article
Demonstration of Eight-Sensor Sagnac Fiber-Optic Hydrophone Array with Alternative Quadrature Phase Bias and Response Equalization Demodulation Algorithm
by Delong Zhao, Ke Wang, Shuolin Yang, Wenjie Xie, Yuzhong Chen, Jie Yang, Zhangqi Song and Zhaohua Sun
Photonics 2025, 12(1), 34; https://doi.org/10.3390/photonics12010034 - 3 Jan 2025
Viewed by 502
Abstract
The Sagnac interferometer-based fiber-optic hydrophone (S-FOH) exhibits a frequency-dependent response, causing the output signal to deviate from the original acoustic signal, with severe cases leading to signal distortion. A response equalization demodulation algorithm is demonstrated to recover high-fidelity acoustic signals from interference phase [...] Read more.
The Sagnac interferometer-based fiber-optic hydrophone (S-FOH) exhibits a frequency-dependent response, causing the output signal to deviate from the original acoustic signal, with severe cases leading to signal distortion. A response equalization demodulation algorithm is demonstrated to recover high-fidelity acoustic signals from interference phase signals. An eight-sensor S-FOH array featuring an alternative quadrature phase bias scheme is demonstrated, and experimental verification of the response equalization demodulation algorithm is performed. The temporal relationship of phase modulation pulses and sampling light pulses is analyzed, and a demodulation algorithm is introduced to obtain the phase difference of the Sagnac interferometer. The acoustic pressure sensitivity is equalized to be flat with an average of −135.0 ± 0.4 dB from 10 to 2032 Hz. The pulse response of the S-FOHA after the equalization algorithm is highly similar to the PZT hydrophone output signal, with a correlation coefficient of 0.987. Full article
(This article belongs to the Special Issue Advancements in Optical Fiber Sensing)
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