Special Issue "Microwave Photonics 2018"

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

Deadline for manuscript submissions: closed (30 November 2018).

Special Issue Editors

Dr. Ivana Gasulla
Website
Guest Editor
ITEAM Research Institute, Universitat Politècnica de València, 46022 Valencia, Spain
Interests: radiofrequency signal processing; fiber-wireless communications; space-division multiplexing
Prof. Mable P. Fok
Website
Guest Editor
Lightwave and Microwave Photonics Laboratory, College of Engineering, University of Georgia, Athens, GA 30606, USA
Interests: microwave photonics; biomimetic photonics; neuromorphic photonics; fiber optic sensors
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Special Issue Information

Dear Colleagues,

Bringing together the worlds of radiofrequency and optics engineering, the interdisciplinary field of Microwave Photonics (MWP) pursues the generation, processing, and distribution of microwave and millimeter-wave signals by photonic means. In comparison to traditional microwave technologies, MWP brings unique advantages inherent to photonics, such as low loss (independent of the radio frequency), high bandwidth or immunity to electromagnetic interference. In addition, it enables key processing features, such as fast tunability and reconfigurability, which are very complex or even impossible to achieve using conventional electronic approaches. These attractive properties are behind the increasing interest from both the research community and the industry experienced over the last two decades in various applications areas. In telecommunication networks, MWP enables distributed antenna and radio-over fiber systems, where broadband microwave and millimeter-wave signals are delivered from/to a central office to/from a variety of base stations with limited distortion as well as very low and frequency independent losses. In signal processing, MWP systems allow tunable and reconfigurable signal filtering and beamsteering of radiofrequency signals; while photonic analogue-to-digital converters bring the possibility of digitizing broadband signals at THz sampling rate. MWP allows as well the implementation of very versatile RF signal generators and optoelectronic oscillators spanning from ultrawideband to millimeter-wave signals.

Apart from the considerable added value that MWP brings to traditional microwave and radiofrequency systems, this interdisciplinary field holds a promising future in a myriad of emerging areas, such as the Internet of Things, medical imaging systems using Terahertz waves, optical coherence tomography, distributed sensing, wireless and body personal area networks, as well as converged fiber-wireless broadband access networks for 5G communications.

This Special Issue will address the current progress and latest breakthroughs in “Microwave Photonics”, covering among others the topics listed below. Both original research papers and review articles are welcome.

Dr. Ivana Gasulla
Dr. Mable P. Fok
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 papers will be 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 1800 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

  • Fiber-wireless communications and 5G
  • Radiofrequency signal processing, sensing, and measurements
  • Arbitrary microwave waveform generation
  • Optoelectronic oscillation
  • Microwave signal distribution
  • Integrated microwave photonics
  • Terahertz photonics and applications
  • Novel applications of microwave photonics

Published Papers (9 papers)

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Editorial

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Open AccessEditorial
Special Issue “Microwave Photonics 2018”
Appl. Sci. 2020, 10(2), 674; https://doi.org/10.3390/app10020674 - 18 Jan 2020
Abstract
Bringing together the worlds of radiofrequency and optics engineering, the interdisciplinary field of microwave photonics (MWP) pursues the generation, processing, and distribution of microwave and millimeter-wave signals by photonic means [...] Full article
(This article belongs to the Special Issue Microwave Photonics 2018)

Research

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Open AccessArticle
Photonic-Assisted Scanning Receivers for Microwave Frequency Measurement
Appl. Sci. 2019, 9(2), 328; https://doi.org/10.3390/app9020328 - 17 Jan 2019
Cited by 3
Abstract
We present a novel technique based on matrix pencil assisted deconvolution to improve the measurement resolution in scanning receiver systems for microwave frequency measurements. By modeling the scanning receiver output as the cross-correlation of the input modulated signal with the filter’s spectral response [...] Read more.
We present a novel technique based on matrix pencil assisted deconvolution to improve the measurement resolution in scanning receiver systems for microwave frequency measurements. By modeling the scanning receiver output as the cross-correlation of the input modulated signal with the filter’s spectral response and applying the matrix pencil algorithm to convolve the detected optical signal at the receiver output, our technique offers precise estimations of both the frequency and power information of microwave signals with an improved measurement resolution. A multi-tone microwave signal measurement based on an optical filter is experimentally demonstrated, showing a significant measurement resolution reduction from 1 GHz to 0.4 GHz for two radio frequency (RF) tones, which is only about 30.2% of the optical filter bandwidth. Full article
(This article belongs to the Special Issue Microwave Photonics 2018)
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Open AccessArticle
Ripple Suppression in Broadband Microwave Photonic Phase Shifter Frequency Response
Appl. Sci. 2018, 8(12), 2433; https://doi.org/10.3390/app8122433 - 30 Nov 2018
Cited by 1
Abstract
This paper presents a detailed investigation on the cause of ripples in the frequency response of a microwave photonic phase shifter implemented using a 90° hybrid coupler. It was found that an unwanted radio frequency (RF) modulation sideband is generated at the modulator [...] Read more.
This paper presents a detailed investigation on the cause of ripples in the frequency response of a microwave photonic phase shifter implemented using a 90° hybrid coupler. It was found that an unwanted radio frequency (RF) modulation sideband is generated at the modulator output due to the 90° hybrid coupler amplitude and phase imbalance. This resulted in phase shifter output RF signal amplitude variation and phase deviation. Experimental results demonstrated that incorporating an optical filter in the phase shifter structure can reduce the amplitude variation and phase deviation from 4.2 dB to 2.2 dB and from ±12° to ±3.8°, respectively, over a wide frequency range. A comparison of the loss and the dynamic range of the microwave photonic phase shifter implemented using a 90° hybrid coupler with a conventional fiber optic link is also presented. Full article
(This article belongs to the Special Issue Microwave Photonics 2018)
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Review

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Open AccessReview
High-Speed Photodetectors for Microwave Photonics
Appl. Sci. 2019, 9(4), 623; https://doi.org/10.3390/app9040623 - 13 Feb 2019
Cited by 3
Abstract
This paper reviews high-power photodiodes, waveguide photodetectors, and integrated photodiode-antenna emitters with bandwidths up to 150 GHz. Results from heterogeneous III-V photodiodes on silicon and Ge-on-Si photodiode arrays for analog applications are presented. Full article
(This article belongs to the Special Issue Microwave Photonics 2018)
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Open AccessReview
Photonic Systems and Devices for Linear Cell Radar
Appl. Sci. 2019, 9(3), 554; https://doi.org/10.3390/app9030554 - 07 Feb 2019
Cited by 1
Abstract
This paper reviews linear cell radar systems, which are radar systems consisting of many antenna units connected by radio-over-fiber to monitor linear-shaped areas. A linear cell system using a millimeter-wave band can provide high-resolution imaging for foreign object detection on runways. Electro-optic devices [...] Read more.
This paper reviews linear cell radar systems, which are radar systems consisting of many antenna units connected by radio-over-fiber to monitor linear-shaped areas. A linear cell system using a millimeter-wave band can provide high-resolution imaging for foreign object detection on runways. Electro-optic devices play important roles in linear cell systems to provide a conversion between optical and electric signals. This paper describes overviews of such devices including light sources, photodetectors, and optical modulators, etc. Full article
(This article belongs to the Special Issue Microwave Photonics 2018)
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Open AccessReview
A Review of Recent Results on Simultaneous Interrogation of Multiple Fiber Bragg Grating-Based Sensors Using Microwave Photonics
Appl. Sci. 2019, 9(2), 298; https://doi.org/10.3390/app9020298 - 15 Jan 2019
Cited by 5
Abstract
We review recent results on exploiting microwave photonics to enable simultaneous interrogation of multiple fiber Bragg grating (FBG)-based sensors. In particular, we describe the use of (1) microwave photonic filtering and (2) chirped microwave pulse generation and compression as a means to map [...] Read more.
We review recent results on exploiting microwave photonics to enable simultaneous interrogation of multiple fiber Bragg grating (FBG)-based sensors. In particular, we describe the use of (1) microwave photonic filtering and (2) chirped microwave pulse generation and compression as a means to map the wavelength (spectral) changes in the response of FBG-based sensors (specifically, an in-fiber Fabry-Pérot cavity sensor based on FBGs, FBG sensors directly, and a linearly chirped FBG sensor) to applied temperature (or strain) to the power of a radio-frequency signal (i.e., a wavelength-to-power mapping) or to the correlation peak of the compressed microwave signal. The approaches support high-resolution and high-speed interrogation and can be suitable for large scale sensing networks. Full article
(This article belongs to the Special Issue Microwave Photonics 2018)
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Open AccessReview
Microwave Photonic Devices Based on Liquid Crystal on Silicon Technology
Appl. Sci. 2019, 9(2), 260; https://doi.org/10.3390/app9020260 - 12 Jan 2019
Cited by 2
Abstract
This paper reviews the recent developments in microwave photonic devices based on liquid crystal on silicon (LCOS) technology. The operation principle, functions and important specifications of an LCOS based optical processor are described. Three microwave photonic devices, which are microwave photonic notch filters, [...] Read more.
This paper reviews the recent developments in microwave photonic devices based on liquid crystal on silicon (LCOS) technology. The operation principle, functions and important specifications of an LCOS based optical processor are described. Three microwave photonic devices, which are microwave photonic notch filters, phase shifters and couplers, reported in the past five years are focused on in this paper. In addition, a new multi-function signal processing structure based on amplitude and phase control functions in conjunction with a power splitting function in a commercial LCOS based optical processor is presented. It has the ability to realize multiple time -shifting operations and multiple frequency-independent phase shifting operations at the same time and control multiple RF signal amplitudes, in a single unit. The results for the new multi-function microwave photonic signal processor demonstrate multiple tunable true time delay and phase shifting operations with less than 3 dB amplitude variation over a very wide frequency range of 10 to 40 GHz. Full article
(This article belongs to the Special Issue Microwave Photonics 2018)
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Open AccessReview
Microwave Photonic Signal Processing and Sensing Based on Optical Filtering
Appl. Sci. 2019, 9(1), 163; https://doi.org/10.3390/app9010163 - 04 Jan 2019
Cited by 4
Abstract
Microwave photonics, based on optical filtering techniques, are attractive for wideband signal processing and high-performance sensing applications, since it brings significant benefits to the fields by overcoming inherent limitations in electronic approaches and by providing immunity to electromagnetic interference. Recent developments in optical [...] Read more.
Microwave photonics, based on optical filtering techniques, are attractive for wideband signal processing and high-performance sensing applications, since it brings significant benefits to the fields by overcoming inherent limitations in electronic approaches and by providing immunity to electromagnetic interference. Recent developments in optical filtering based microwave photonics techniques are presented in this paper. We present single sideband modulation schemes to eliminate dispersion induced power fading in microwave optical links and to provide high-resolution spectral characterization functions, single passband microwave photonic filters to address the challenges of eliminating the spectral periodicity in microwave photonic signal processors, and review the approaches for high-performance sensing through implementing microwave photonics filters or optoelectronic oscillators to enhance measurement resolution. Full article
(This article belongs to the Special Issue Microwave Photonics 2018)
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Open AccessReview
Stable and Low-Spurs Optoelectronic Oscillators: A Review
Appl. Sci. 2018, 8(12), 2623; https://doi.org/10.3390/app8122623 - 14 Dec 2018
Cited by 4
Abstract
An optoelectronic oscillator (OEO) is an optoelectronic hybrid oscillator which utilizes ultra-low-loss fiber as an electro-magnetic energy storage element, overcoming the limits of traditional microwave oscillators in phase noise performance. Due to their ability to generate ultra-low phase noise microwave signal, optoelectronic oscillators [...] Read more.
An optoelectronic oscillator (OEO) is an optoelectronic hybrid oscillator which utilizes ultra-low-loss fiber as an electro-magnetic energy storage element, overcoming the limits of traditional microwave oscillators in phase noise performance. Due to their ability to generate ultra-low phase noise microwave signal, optoelectronic oscillators have attracted considerable attentions and are becoming one of the most promising and powerful microwave signal sources. In this paper, we briefly introduce the operation principle and discuss current research on frequency stability and spurious suppression of optoelectronic oscillators. Full article
(This article belongs to the Special Issue Microwave Photonics 2018)
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