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Micromachines
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Fiber-Optic Technologies for Communication and Sensing
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Fiber-Optic Technologies for Communication and Sensing

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "A：Physics".

Deadline for manuscript submissions: 31 May 2025 | Viewed by 2383

Special Issue Editors

Prof. Dr. Pengyu Guan

E-Mail Website
Guest Editor
School of Cyberspace Science and Technology, Beijing Institute of Technology, Beijing 100081, China
Interests: ultra-high speed optical communications; optical signal processing; nonlinear optics; time lens; optical fourier transformation; spectrally-efficient communications; flexible PON system
Prof. Dr. Xingyuan Xu

E-Mail Website
Guest Editor
State Key Laboratory of Information of Photonics and Optical Communications, School of Electronic Engineering, Beijing University of Posts and Telecommunications, Beijing 100876, China
Interests: programmable photonic chips; integrated optical Kerr frequency combs

Special Issue Information

Dear Colleagues,

This Special Issue, entitled "Fiber-Optic Technologies for Communication and Sensing", aims to delve into the innovations within the field of fiber-optic technologies, where fiber-based devices stand at the forefront. This Special Issue aims to focus on the intricate and sophisticated world of fiber-optic technologies—encompassing sensors, amplifiers, and fiber lasers—that are driving advancements across various domains. From the precision required in sensing applications to the demands of high-speed communication networks, and even the emerging challenges in micro-nano research, these optical solutions are proving to be both versatile and indispensable.

In this rapidly evolving landscape, the unique capabilities of fiber optics, such as their sensitivity, bandwidth, and integrative potential, offer exciting new possibilities. This Special Issue seeks to capture the full spectrum of current research, ranging from theoretical explorations to practical implementations. We encourage submissions that push the boundaries of what is possible, whether through novel device designs, cutting-edge signal processing algorithms, or innovative system integrations. The topics of interest for this Special Issue include, but are not limited to, the design, fabrication, and characterization of photonic components and their applications, fiber lasers, optical frequency combs, photonic crystal fibers, nonlinear devices, optical computing, quantum information processing, optical interconnects, and optical access networks.

Prof. Dr. Pengyu Guan
Prof. Dr. Xingyuan Xu
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. Micromachines 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 2100 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 signal processing
  • optical communication
  • nonlinear devices
  • fiber lasers
  • optical frequency comb
  • photonic crystal fibers
  • optical computing
  • quantum information processing
  • optical interconnects
  • optical fiber amplifier and optical module
  • fiber-optic sensor
  • fiber Bragg grating

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Published Papers (3 papers)

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Research

13 pages, 2727 KiB  
Article
Spectral and Microscopic Behavior of Type III Femtosecond Fiber Bragg Gratings at High Temperatures
by Matilde Sosa, Maxime Cavillon, Thomas Blanchet, Matthieu Lancry and Guillaume Laffont
Micromachines 2025, 16(3), 331; https://doi.org/10.3390/mi16030331 - 12 Mar 2025
Viewed by 542
Abstract
Fiber Bragg gratings are key components for optical fiber sensing applications in harsh environments. Microvoids, or so-called type III fiber Bragg gratings, fabricated using femtosecond lasers and the point-by-point technique, were characterized at high temperatures (>1100 °C). For this purpose, we monitored the [...] Read more.
Fiber Bragg gratings are key components for optical fiber sensing applications in harsh environments. Microvoids, or so-called type III fiber Bragg gratings, fabricated using femtosecond lasers and the point-by-point technique, were characterized at high temperatures (>1100 °C). For this purpose, we monitored the spectral characteristics of the grating, as well as the evolution of the microstructure during a 30 min isochronal annealing process. This study allowed us to correlate the behavior of the microvoids with the spectral performances (amplitude, wavelength drift) of the sensors at very high temperatures. As the grating signal is being lost at increasing temperatures (above 1125 °C), the periodic array of microvoids becomes disordered and deformed, ultimately losing its periodic spacing. Full article
(This article belongs to the Special Issue Fiber-Optic Technologies for Communication and Sensing)
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10 pages, 3762 KiB  
Article
All-Optical Single-Longitudinal-Mode Forward Brillouin Microwave Oscillator with an Unbalanced Fiber Mach–Zehnder Interferometer
by Xinyue Fang, Wenjun He, Wen Wang, Yi Liu, Yajun You, Qing Yan, Yafei Hou, Zepeng Wu, Lei Yu, Songquan Yan, Mingxing Li, Jian He and Xiujian Chou
Micromachines 2025, 16(2), 209; https://doi.org/10.3390/mi16020209 - 12 Feb 2025
Viewed by 658
Abstract
An all-optical single-longitudinal-mode (SLM) forward Brillouin microwave oscillator (FB-MO) with an unbalanced Fiber Mach–Zehnder interferometer (UF-MZI) for microwave photonics (MWP) generation is proposed and experimentally investigated. UF-MZI consists of an optical coupler (OC), a polarization controller (PC), and two asymmetric length arms with [...] Read more.
An all-optical single-longitudinal-mode (SLM) forward Brillouin microwave oscillator (FB-MO) with an unbalanced Fiber Mach–Zehnder interferometer (UF-MZI) for microwave photonics (MWP) generation is proposed and experimentally investigated. UF-MZI consists of an optical coupler (OC), a polarization controller (PC), and two asymmetric length arms with 5 km and 500 m single-mode fibers (SMFs), which implements two unbalanced length feedback rings that are connected to one another. One long-length ring with a forward Brillouin gain cooperates with the other short-length ring to maintain a spectral Vernier effect and improve the effective free spectral range (FSR). By contrast with traditional optoelectronic oscillators (OEOs), this design does not require any photoelectric conversion devices and additional modulation, avoids external electromagnetic interference, and side-mode suppression and linewidth are favorable. Experimental results reveal that the 3-dB linewidth of the all-optical SLM FB-MO with UF-MZI is about 140 Hz. The acoustic-mode and side-mode suppression ratios are 26 dB and 31 dB. Within 60 min of the stability experiment, the power and frequency stability fluctuation were ±1 dB and ±100 Hz. Thanks to its long main ring cavity length, our all-optical SLM FB-MO with UF-MZI maintains good phase-noise performance. The measurement shows that a phase noise as low as −120 dBc/Hz at an offset frequency of 100 kHz is achieved. This SLM MWP generation technology holds great potential for applications in radar monitoring and wireless communication systems. Full article
(This article belongs to the Special Issue Fiber-Optic Technologies for Communication and Sensing)
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11 pages, 2585 KiB  
Article
Narrow Linewidth All-Optical Microwave Oscillator Based on Torsional Radial Acoustic Modes of Single-Mode Fiber
by Wen Wang, Wenjun He, Xinyue Fang, Yi Liu, Yajun You, Mingxing Li, Lei Yu, Qing Yan, Yafei Hou, Jian He and Xiujian Chou
Micromachines 2025, 16(1), 97; https://doi.org/10.3390/mi16010097 - 15 Jan 2025
Viewed by 816
Abstract
A Hz level narrow linewidth all-optical microwave oscillator based on the torsional radial acoustic modes (TR2,m) of a single-mode fiber (SMF) is proposed and validated. The all-optical microwave oscillator consists of a 20 km SMF main ring cavity and a 5 [...] Read more.
A Hz level narrow linewidth all-optical microwave oscillator based on the torsional radial acoustic modes (TR2,m) of a single-mode fiber (SMF) is proposed and validated. The all-optical microwave oscillator consists of a 20 km SMF main ring cavity and a 5 km SMF sub ring cavity. The main ring cavity provides forward stimulated Brillouin scattering gain and utilizes a nonlinear polarization rotation effect to achieve TR2,7 mode locking. By combining the sub ring cavity with the main ring cavity and utilizing the Vernier effect, the TR2,7 mode microwave photonic single longitudinal mode (SLM) output can be ensured. Meanwhile, the 6.281 Hz narrow linewidth of the TR2,7 mode is achieved by reducing the intrinsic linewidth of the passive resonant cavity. The acoustic mode suppression ratio and side mode suppression ratio of the TR2,7 mode were 43 dB and 54 dB, respectively. The power and frequency fluctuations of within 40 min were approximately ±0.49 dB and ±0.187 kHz, indicating good stability. At a frequency offset of 10 kHz, the TR2,7 mode had a low phase noise value of −110 dBc/Hz. This solution can be used in various fields, such as high-precision radar detection, long-distance optical communication, and high-performance fiber optic sensing. Full article
(This article belongs to the Special Issue Fiber-Optic Technologies for Communication and Sensing)
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