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Applied Sciences
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Advanced in Optical Signal : Generation, Processing and Characterization
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Advanced in Optical Signal : Generation, Processing and Characterization

A special issue of Applied Sciences (ISSN 2076-3417). This special issue belongs to the section "Optics and Lasers".

Deadline for manuscript submissions: closed (31 August 2023) | Viewed by 6917

Special Issue Editors

Dr. Jian Dai

E-Mail Website
Guest Editor
State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing 100876, China
Interests: microwave photonics; optics and photonics
Prof. Dr. Xiaojun Xie

E-Mail Website
Guest Editor
School of Information Science and Technology, Southwest Jiaotong University, Chengdu 610031, China
Interests: optoelectronics devices; photonics integrated circuit; microwave photonics

Special Issue Information

Dear Colleagues,

It is my pleasure to invite you to contribute to the Special Issue on Advanced in Optical Signal : Generation, Processing and Characterization.

Optical signal processing offers significant advantages to overcome electronic bottlenecks for processing ultra-wideband or high-frequency signals, allowing the manipulation of ultra-high-speed signals from the microwave and millimeter-wave domain to the optical domain. Almost all traditional functions in electronic signal processing can be realized in the photonic domain, and it can provide significant improvement in performance and functionality. Furthermore, optical signal generation and characterization are extremely important for this fast-emerging field. Naturally, the applications of such advanced techniques would be also essential to illustrate their usefulness in radar and communications applications.

This Special Issue welcomes contributions to the potential topics of interest including, but not limited to the following areas:

  • Advanced photonic/microwave signal generation
  • Photonic microwave signal processing and manipulating
  • Photonic techniques for signal transmission and distribution
  • Photonics based signal sensing and measurement
  • Photonic device design and integration
  • Innovative applications of optical processing

Dr. Jian Dai
Prof. Dr. Xiaojun Xie
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. Applied Sciences is an international peer-reviewed open access semimonthly 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

  • advanced photonic/microwave signal generation
  • photonic microwave signal processing and manipulating
  • photonic techniques for signal transmission and distribution
  • photonics based signal sensing and measurement
  • photonic device design and integration
  • innovative applications of optical processing

Published Papers (5 papers)

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Research

12 pages, 3216 KiB  
Article
Research of Tri-State Optical Signal Detectors for Ternary Optical Computers
by Shuxin Wang, Jiabao Jiang, Zhehe Wang, Honghong Zhang and Shan Ouyang
Appl. Sci. 2023, 13(5), 2800; https://doi.org/10.3390/app13052800 - 22 Feb 2023
Viewed by 922
Abstract
A tri-state optical signal detector (TOD) is designed in this article to improve the accuracy and stability of decoding results of the ternary optical computer (TOC). The TOD consists of three modules: a light-sensing module, a voltage divider module, and a data latching [...] Read more.
A tri-state optical signal detector (TOD) is designed in this article to improve the accuracy and stability of decoding results of the ternary optical computer (TOC). The TOD consists of three modules: a light-sensing module, a voltage divider module, and a data latching and conversion module. First, a voltage divider circuit with adjustable resistors is used to achieve parallel optical–electrical signal conversion for each LCD pixel on a photosensitive sensor plus a latch structure. Second, the problem of the parallel storage of data after photoelectric conversion is solved. Third, a transcoding circuit from the output signal of the TOD to the input signal of the tri-state optical encoder (TOE) is given. The experimental results show that the tri-state optical signal detector designed in this paper is effective and feasible. Full article
(This article belongs to the Special Issue Advanced in Optical Signal : Generation, Processing and Characterization)
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10 pages, 2019 KiB  
Article
RF Frequency Selective Switch by Multiple PMIM Conversions
by Wenhui Hao, Yi Peng, Shaohua Wang and Xia Liu
Appl. Sci. 2023, 13(4), 2472; https://doi.org/10.3390/app13042472 - 14 Feb 2023
Viewed by 901
Abstract
Nowadays, broadband and multi-channel radio frequency (RF) processing has been widely used in communication, radar, countermeasure, and other applications. At present, multiple-input and multiple-output (MIMO)-oriented microwave photonic signal processing technology is relatively scarce, so this paper proposes an RF frequency selective switch (FSS) [...] Read more.
Nowadays, broadband and multi-channel radio frequency (RF) processing has been widely used in communication, radar, countermeasure, and other applications. At present, multiple-input and multiple-output (MIMO)-oriented microwave photonic signal processing technology is relatively scarce, so this paper proposes an RF frequency selective switch (FSS) based on multiple phase modulation to intensity modulation (PMIM) conversions. PMIM conversion has been used in narrowband microwave photonic filtering in the past. We extend it to a wideband and arbitrarily reconfigurable RF spectrum processing unit through an optical frequency comb and periodic optical filter. Although we use the incoherent combination of a multi-wavelength light source, we can obtain any frequency response including rectangles only by using all positive tap coefficients. Using an optical wavelength selective switch (WSS), we obtain RF FSS, and the spectral resolution of RF FSS is much better than that of optical WSS, which is improved by more than two orders of magnitude. The above principles, including single-channel reconfigurable filtering and multi-channel RF FSS, are verified by experiments. Our technology provides a stable solution for future RF MIMO signal processing. Full article
(This article belongs to the Special Issue Advanced in Optical Signal : Generation, Processing and Characterization)
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11 pages, 4525 KiB  
Article
Reconfigurable Multi-Beam Receiver Based on Microwave Photonics Technology
by Yue Lin, Jun Su, Qi Qiu, Zhiqiang Fan, Shuangjin Shi, Yunxiang Wang, Di Jiang, Yuan Chen and Xiang Li
Appl. Sci. 2023, 13(3), 1422; https://doi.org/10.3390/app13031422 - 20 Jan 2023
Viewed by 1021
Abstract
A novel multi-beam photonic receiver with a variable beam count has been proposed. The reconfigurable characteristic of the system is enabled with the variable splitters and optical switch arrays. According to the number of beams it is due to receive, the splitter with [...] Read more.
A novel multi-beam photonic receiver with a variable beam count has been proposed. The reconfigurable characteristic of the system is enabled with the variable splitters and optical switch arrays. According to the number of beams it is due to receive, the splitter with suitable ports is chosen to split by controlling the optical switch in order to configure the optical path. After splitting, the multi-wavelength optical carriers are sent to the wavelength division multiplexer to combine and complete the multi-beamforming process. Two structures have been designed to realize the reconfigurable function, while the optimized structure is proved by using several benchmarks for comparison. The operation step of the reconfigurable multi-beam receiver is then given. The first simulations validate that the proposed architecture can dynamically receive the multi-beam with a variable number by reconfiguring the state of the optical switch. The second simulation of the influence on the received beam pattern was performed under a different amplitude and phase inconsistency random values. The results show that the amplitude and phase inconsistency will decline the quality of the multi-beam. When the amplitude and phase inconsistency are within limits, the difference in the optical path within the outputs must be balanced and compensated during the proposed system’s fabrication and deployment. Full article
(This article belongs to the Special Issue Advanced in Optical Signal : Generation, Processing and Characterization)
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10 pages, 8258 KiB  
Communication
Real-Time Eye Diagram Monitoring for Optical Signals Based on Optical Sampling
by Tao Huang, Zhiqiang Fan, Jun Su and Qi Qiu
Appl. Sci. 2023, 13(3), 1363; https://doi.org/10.3390/app13031363 - 19 Jan 2023
Cited by 1 | Viewed by 1730
Abstract
A real-time eye diagram monitoring method for optical signals is proposed and experimentally demonstrated based on optical sampling. In the system, the optical signals under test are directly sampled by an optical sampling pulse train with a narrow pulse width and a high [...] Read more.
A real-time eye diagram monitoring method for optical signals is proposed and experimentally demonstrated based on optical sampling. In the system, the optical signals under test are directly sampled by an optical sampling pulse train with a narrow pulse width and a high repetition frequency. The sampling pulse train is achieved in a Mach-Zehnder modulator (MZM), gated on-off by an electrical pulse. The sampled optical signals are then broadened and detected by a photodetector (PD). A low-speed electrical analog-to-digital converter (ADC) will then quantify the detected electrical signals. Combining with an algorithm based on the infinitesimal calculus, the quantified data is then used to achieve the eye diagram, according to which more time-domain parameters, such as period, time jitter, Q value, and bit error rate (BER) for the optical signals under test, are obtained. Thanks to the high repetition rate of the optical sampling pulse train, the eye diagram and the time-domain parameters of the optical signals are observed in real time. Experimental results show that a real time of about 350-μs eye diagram monitoring for a 2.5-Gb/s optical signal with a dynamic range from −10 to −22 dBm is achieved. In addition, time jitters are measured to range from 4.3 to 49.8 ps. Q values are estimated to range from 20.4 to 4.3, corresponding to BERs ranging from 2.3 × 10−92 to 8.5 × 10−6. The results are also verified by a commercial real-time oscilloscope. Full article
(This article belongs to the Special Issue Advanced in Optical Signal : Generation, Processing and Characterization)
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9 pages, 2532 KiB  
Communication
Stimulated Brillouin Scattering Threshold in Presence of Modulation Instability for Optical Pulse in Long Optical Fiber
by Xiaoyang Hu, Qiuyang Huang, Yang Lu and Zhou Meng
Appl. Sci. 2022, 12(21), 10868; https://doi.org/10.3390/app122110868 - 26 Oct 2022
Cited by 1 | Viewed by 1790
Abstract
A theoretical and experimental study on the stimulated Brillouin scattering (SBS) threshold for optical pulse in the presence of modulation instability (MI) in long optical fiber is presented. The effects of MI on the SBS gain and threshold are analyzed based on the [...] Read more.
A theoretical and experimental study on the stimulated Brillouin scattering (SBS) threshold for optical pulse in the presence of modulation instability (MI) in long optical fiber is presented. The effects of MI on the SBS gain and threshold are analyzed based on the coupled-wave equation. An analytic expression is obtained to calculate the SBS threshold in the presence of MI. Numerical simulation is conducted to study the effects of the repetition rate and amplified spontaneous emission (ASE) noise on the SBS threshold for optical pulses. An experiment is conducted, and the results agree well with the theoretical analysis. The results clearly reveal how MI affects the Brillouin gain and SBS threshold of optical pulses in long optical fiber. The SBS threshold is affected by the ASE noise level and the repetition rate of the optical pulse. The study is helpful for the power evaluation of interferometric fiber sensing systems and optical power transmission systems. Full article
(This article belongs to the Special Issue Advanced in Optical Signal : Generation, Processing and Characterization)
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