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Photonics
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Focus on Nonlinear Processing and Detection Technologies of Weak Optical...
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Focus on Nonlinear Processing and Detection Technologies of Weak Optical Signal

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

Deadline for manuscript submissions: closed (20 October 2023) | Viewed by 4405

Special Issue Editors

Dr. Zhaolu Wang

E-Mail Website
Guest Editor
Xi'an Institute of Optics and Precision Mechanics Chinese Academy of Sciences, Xi'an, China
Interests: nonlinear enhancement and detection technology for weak optical signals; silicon-based micro-nano nonlinear all-optical signal processing technology
Dr. Yu Zhang

E-Mail Website
Guest Editor
Research Fellow, Faculty of Engineering, University of Nottingham, Nottingham, UK
Interests: the wavefront correction in microscopy; non-linear microscopy such as two photon; SHG; CARS; confocal microscopy; computational imaging such as sheared speckle imaging; laser coherent imaging and light modulation imaging

Special Issue Information

Dear Colleagues,

Accurate detection of weak optical signals with a very low signal-to-noise ratio is very important in areas including optical communication, imaging, remote sensing, and quantum optics. Some nonlinear processing techniques have unique advantages for weak optical signal detection, which can amplify and regenerate the weak signal from different noises such as phase noise, amplitude noise, or quantum noise. In order to focus on the latest research progress in nonlinear processing and detection technologies of weak optical signals, we welcome original research articles and reviews for submission to this Special Issue. Potential nonlinear technologies include but are not limited to the following:

  • Phase-sensitive optical parametric amplification technology;
  • Time lens technology;
  • Mid-infrared up-conversion technology;
  • Terahertz generation and detection technology;
  • Quantum enhancement and detection technology;
  • Nonlinear optical imaging technology.

Dr. Zhaolu Wang
Dr. Yu Zhang
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 (2 papers)

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Research

15 pages, 4089 KiB  
Article
An Airborne Visible Light Lidar’s Methodology for Clear Air Turbulence Detection Based on Weak Optical Signal
by Jing Zhao, Xiujuan Luo and Hui Liu
Photonics 2023, 10(11), 1185; https://doi.org/10.3390/photonics10111185 - 24 Oct 2023
Viewed by 2631
Abstract
A clear air turbulence (CAT) detection method using a 532 nm visible light airborne laser radar (LiDAR) system is proposed to address the urgent challenge in the aviation safety field. This method is based on the indirect detection technique of atmospheric molecular density [...] Read more.
A clear air turbulence (CAT) detection method using a 532 nm visible light airborne laser radar (LiDAR) system is proposed to address the urgent challenge in the aviation safety field. This method is based on the indirect detection technique of atmospheric molecular density for CAT and utilizes the strong aerosol scattering absorption characteristics of the iodine molecular 1109 absorption line to eliminate the interference of aerosol scattering and extinction on the weak molecular backscattering signal caused by CAT. This enables CAT detection under conditions where traditional ultraviolet LiDAR systems fail to function properly due to aerosol presence. The influence of axial wind speed and atmospheric temperature variations on the molecular backscattering spectrum in the aircraft flight path is studied, and a formula for vertical wind speed inversion in the CAT field is derived. The 532 nm airborne LiDAR CAT detection theoretical model and system architecture are presented. Through simulation analysis, the CAT detection range of the visible light LiDAR system is evaluated under different aircraft cruising altitudes and turbulence intensities. The results indicate that, with the proposed LiDAR system, the aerosol scattering influence can be effectively suppressed, and CAT can be detected up to 7 km for light-to-moderate turbulence and 10 km for moderate turbulence ahead of the aircraft when traditional ultraviolet LiDAR systems fail as the backscattering coefficient ratio between aerosol and molecule reaches the 10−1 condition. Based on this finding, a suggestion is made to construct a dual-wavelength (ultraviolet-visible) LiDAR system for CAT detection, aiming to solve the full coverage problem of CAT detection under various aerosol conditions. This study has a reference value for promoting the early resolution of CAT detection in the aviation field. Full article
(This article belongs to the Special Issue Focus on Nonlinear Processing and Detection Technologies of Weak Optical Signal)
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11 pages, 16655 KiB  
Article
Study on the Influence of Underwater LED Illumination on Bidirectional Underwater Wireless Optical Communication
by Kelin Sun, Biao Han, Jingchuan Yang, Bo Li, Bin Zhang, Kaibin Liu and Chen Li
Photonics 2023, 10(5), 596; https://doi.org/10.3390/photonics10050596 - 21 May 2023
Cited by 4 | Viewed by 1381
Abstract
Underwater wireless optical communication (UWOC) is acknowledged as a useful way to transmit data in the ocean for short-distance applications. Carrying a UWOC device on mobile platforms is quite practical in ocean engineering, which is helpful to exploit its advantages. In application, such [...] Read more.
Underwater wireless optical communication (UWOC) is acknowledged as a useful way to transmit data in the ocean for short-distance applications. Carrying a UWOC device on mobile platforms is quite practical in ocean engineering, which is helpful to exploit its advantages. In application, such a platform needs a camera to observe the surroundings and guide its action. Since the majority of ocean is always dark, active illumination is necessary to imaging. When UWOC works in such an environment, its performance is affected by the illumination light noise. In this paper, we study the influence of underwater LED illumination on bidirectional UWOC with the Monte Carlo method. We simulate forward noise from LED illumination to the opposite receiver in the cooperative terminal, and the backscattering noise on the adjacent receiver in the same terminal. The results show that the forward noise is reduced with the increase of theabsorption coefficient, scattering coefficient, transmitting distance, and separated distance between receiver and the optical axis of LED. However, it becomes greater with the field of view (FOV) of the receiver. The backscattering noise is reduced with the increase of the absorption coefficient and separated distance between receiver and LED. However, it becomes greater with the FOV and scattering coefficient, while it has little relation with transmitting distance. In order to reduce these two kinds of noises, besides inserting an optical filter in the receivers and narrowing their FOV, the optical axis of LED light should keep away from the receivers. The results in this paper are helpful for UWOC application. Full article
(This article belongs to the Special Issue Focus on Nonlinear Processing and Detection Technologies of Weak Optical Signal)
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