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Photonics
Special Issues
Microwave Photonics and Applications
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Microwave Photonics and Applications

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

Deadline for manuscript submissions: closed (20 October 2023) | Viewed by 2847

Special Issue Editor

Dr. Gefeson Mendes Pacheco

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Guest Editor
Instituto Tecnológico de Aeronáutica, São José dos Campos, Brazil
Interests: photonics; sensors; optical fibers; communications

Special Issue Information

Dear Colleagues,

Microwave Photonics can be defined through the (i) study of photonic devices capable of processing microwave signals and (ii) the application of photonic devices and techniques to microwave systems. The first is related to the general field of optical telecommunications, where significant progress has been made with devices such as lasers, modulators, and photodetectors capable of handling long digital signals by several Gb/s (or analog signals up to several GHz). The second definition is a direct consequence of various high-speed optoelectronic components. This scenario has allowed them to be used not only for transmitting analog microwave signals over optical fiber but also for processing microwave signals in the optical domain. The development of microwave photonics techniques grows in parallel with the field of optical communications.

This Special Issue, entitled “Microwave Photonics Applications”, will focus on theoretical and practical demonstrations that push the frontier of microwave photonics signal processing and its applications. Relevant topics of interest to this Special Issue include, but are not limited to, the following areas: 

  • microwave photonics
  • photonic links and radio over fiber
  • optical RF signal processing
  • microwave photonics signal generation
  • integrated microwave photonics
  • microwave photonics devices
  • microwave photonics systems
  • microwave photonics for optical communications
  • microwave photonics applications
  • optoelectronics
  • materials and techniques for microwave photonics

Dr. Gefeson Mendes Pacheco
Guest Editor

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.

Published Papers (2 papers)

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Research

11 pages, 11784 KiB  
Article
Generation of a Flat Optical Frequency Comb via a Cascaded Dual-Parallel Mach–Zehnder Modulator and Phase Modulator without Using the Fundamental Tone
by Shiyu Zhang, Zixiong Wang, Xunhe Zuo, Chuang Ma, Yang Jiang and Jinlong Yu
Photonics 2023, 10(12), 1340; https://doi.org/10.3390/photonics10121340 - 4 Dec 2023
Viewed by 1056
Abstract
Under the conventional scheme to generate an optical frequency comb (OFC) using an electro-optic modulator (EOM), the frequency interval of the OFC is determined via the frequency of the fundamental tone of the radio frequency (RF) driving signals. In this work, we use [...] Read more.
Under the conventional scheme to generate an optical frequency comb (OFC) using an electro-optic modulator (EOM), the frequency interval of the OFC is determined via the frequency of the fundamental tone of the radio frequency (RF) driving signals. In this work, we use two harmonics without the fundamental tone to drive two EOMs, where the frequency interval of the generated flat OFC is the frequency of the fundamental tone. The orders of the two harmonics are coprime. Specifically, one harmonic drives the first branch of the dual-parallel Mach–Zehnder modulator (DPMZM) only, and the other harmonic drives the phase modulator (PM). The flatness of the OFC is achieved by adjusting the amplitude and phase of the RF driving harmonics as well as the bias of the EOM. Both a simulation and an experiment were carried out to verify the effectiveness of the proposed scheme. When the second harmonic drives the DPMZM and the third harmonic drives the PM, an 11-comb line OFC is generated, where the flatness of the OFC was 0.63 dB and 0.65 dB under the simulation and experiment, respectively. When the third harmonic drives the DPMZM and the second harmonic drives the PM, a 13-comb line OFC is generated, where the flatness of the OFC was 0.62 dB and 0.95 dB under the simulation and experiment, respectively. We also investigate the performance of the generated OFC when one harmonic drives two branches of the DPMZM and the other harmonic drives the PM. The comparison of the OFCs’ performance demonstrates the effectiveness of the proposed scheme. Full article
(This article belongs to the Special Issue Microwave Photonics and Applications)
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16 pages, 1153 KiB  
Article
An All-Digital Optical Phase-Locked Loop Suitable for Satellite Downlinks
by Jognes Panasiewicz, Nisrine Arab, Fabien Destic, Gefeson M. Pacheco and Angélique Rissons
Photonics 2023, 10(12), 1312; https://doi.org/10.3390/photonics10121312 - 28 Nov 2023
Viewed by 943
Abstract
The optical signal propagation used in satellite uplinks and downlinks is influenced by absorption, scattering, and changes in the atmospheric refractive index or turbulence, causing optical signal attenuation. A free space optics (FSO) communications system using coherent communication can improve the link sensitivity [...] Read more.
The optical signal propagation used in satellite uplinks and downlinks is influenced by absorption, scattering, and changes in the atmospheric refractive index or turbulence, causing optical signal attenuation. A free space optics (FSO) communications system using coherent communication can improve the link sensitivity and reach higher distances. This article proposes a new architecture for the phase detector in an all-digital optical phase-locked loop (OPLL) for coherent optical detection. Firstly, the performance of the proposed phase detector is evaluated under Gaussian noise, where the best operation point is found for the OPLL working with two sample rates: 625 MSa/s and 10 GSa/s. The system analyses also take a non-negligible delay into account. Then, it will be evaluated and compared with an OPLL using an analog phase detector in the presence of atmospheric turbulence. Finally, in three different atmospheric turbulence conditions, the effect of wind speed on communication quality is investigated through the obtained bit error rate (BER) from the recovered data for a bit rate of 20 Gbps. The results show that the proposed digital phase detector can track a signal under longer feedback loop delays and fading signals. Full article
(This article belongs to the Special Issue Microwave Photonics and Applications)
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