Advances in Fiber Optics and Their Applications

A Special Issue of Photonics (ISSN 2304-6732).

Deadline for manuscript submissions: 30 April 2027 | Viewed by 1309

Editor


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Guest Editor
Institute of Fiber Optics, Key Laboratory of Specialty Fiber Optics and Optical Access Networks, Shanghai University, Shanghai 200444, China
Interests: special optical fiber; fiber grating; sensors and systems; optical fiber sensors for environmental monitoring; machine learning for optical sensing and measurement

Special Issue Information

Dear Colleagues,

With the development of optical fiber technology, optical fibers have gradually replaced electronic components in many fields due to their unique advantages, such as anti-electromagnetic interference, corrosion resistance, lightweight, and good mechanical properties. Furthermore, the emergence of new optical fibers and their related devices in recent years has made optical fibers extremely influential in science, engineering, medical and other fields. To further enhance the impact of this exciting and rapidly progressing field, this Special Issue aims to bring together the contributions from experts in this field to provide innovative solutions and explore groundbreaking applications of fiber optics technology. Topics in this Special Issue include, but are not limited to, the following:

  • New structural fibers
  • Functional fibers
  • Fiber gratings
  • Fiber lasers
  • Radiation sensors and dosimeters
  • Fiber optic devices for power engineering and aerospace

Dr. Qiang Guo
Guest Editor

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Keywords

  • optical fiber
  • fiber gratings
  • optical fiber sensors
  • radiotherapy dosimetry
  • optical fiber application
  • photonics
  • fiber laser

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Published Papers (1 paper)

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Research

14 pages, 3619 KB  
Article
Hybrid Nonlinear Least Squares and Gaussian Basis-Function Fitting Method for Synchrotron Beam Intensity Distribution Reconstruction Simulation
by Xulin Luo, Yollanda Bella Christy, Yahui Li, Yuan Ou, Hongli Chen, Jiaxuan Shi, Wenyun Luo and Qiang Guo
Photonics 2026, 13(4), 393; https://doi.org/10.3390/photonics13040393 - 19 Apr 2026
Viewed by 642
Abstract
The transverse beam size is a key parameter for characterizing the performance of synchrotron radiation sources. Accurate measurement of the transverse beam size is crucial for assessing beam quality. In this study, a fiber array-photomultiplier tube (PMT) beam measurement system was developed to [...] Read more.
The transverse beam size is a key parameter for characterizing the performance of synchrotron radiation sources. Accurate measurement of the transverse beam size is crucial for assessing beam quality. In this study, a fiber array-photomultiplier tube (PMT) beam measurement system was developed to enable high-precision sampling of beam profile information for beam-size measurement. Furthermore, a hybrid method integrating nonlinear least squares (NLLS) fitting and Gaussian basis-function fitting was proposed to reconstruct the beam intensity profile from discrete sampling data. Before performing NLLS fitting, a median absolute deviation (MAD)-based threshold filter is employed to remove outliers and suppress random noise, thereby improving the stability and robustness of the parameter estimation. The filtered data are then fitted using NLLS to obtain the reconstructed distribution. To capture potential high-order modal features in the beam profile, a Gaussian basis-function fitting model was also introduced for comparison, and its performance was evaluated under complex intensity distributions. Additionally, the relationship between the full width at half maximum (FWHM) and beam intensity was experimentally verified while accounting for measurement effects in the system. The results demonstrate that the proposed hybrid algorithm improves reconstruction accuracy and robustness, enabling precise recovery of the beam-intensity profile in the fiber-array PMT system. Full article
(This article belongs to the Special Issue Advances in Fiber Optics and Their Applications)
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