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Micromachines
Special Issues
Multi-Functional Integration Microwave Photonic Systems
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Multi-Functional Integration Microwave Photonic Systems

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

Deadline for manuscript submissions: closed (30 September 2023) | Viewed by 6485

Special Issue Editor

Dr. Zihang Zhu

E-Mail Website
Guest Editor
College of Information and Navigation, Air Force Engineering University, Xi’an 710077, China
Interests: microwave photonics; nonlinear optics; optical communications; integrated optics

Special Issue Information

Dear Colleagues,

The use of optical devices and techniques to generate, manipulate, transport and measure high-speed radio-frequency (RF) signals, widely known as microwave photonics, has been the focus of intense research activities in recent years. The key advantages of microwave photonic systems over conventional electrical systems include broad bandwidth, reduced size, low loss and immunity to electromagnetic interference, and propel their applications in various areas (e.g., communications, radar, sensors and instrumentation). With the demand for improved cost effectiveness, microwave photonics have gradually evolved from single-function applications including filtering, frequency conversion, photonic beamforming and other signal processing to multi-functional integration capabilities. It is therefore timely to review the current state-of-the-art development to attract contributions from world leaders in their fields, with particular emphasis on major breakthroughs and outstanding challenges in multi-functional integration microwave photonics systems.

Thank you very much!

Dr. Zihang Zhu
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 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 2600 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

  • microwave photonics
  • integration of microwave photonics mixing and beamforming
  • joint microwave photonics radar and communication systems
  • integration of microwave photonics mixing and fiber transmission
  • integration of microwave photonics detection and measurement
  • integration of microwave photonics channelization and anti-interference
  • integration of microwave photonics detection and fiber transmission
  • integration of microwave photonics beamforming and fiber transmission
  • integration of microwave photonics processing and AI

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Published Papers (3 papers)

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Research

19 pages, 7547 KiB  
Communication
A Photonics-Assisted Binary/Quaternary Phase-Coded Microwave Signal Generator Applicable to Digital I/O Interfaces
by Jing Yin, Yan Zhao, Feng Yang, Dengcai Yang and Xiaoyu Wang
Micromachines 2023, 14(5), 1034; https://doi.org/10.3390/mi14051034 - 11 May 2023
Cited by 1 | Viewed by 1818
Abstract
A photonics-assisted binary/quaternary phase-coded microwave signal generator with fundamental/doubling reconfigurable carrier frequency applicable to digital I/O interfaces is proposed and has been verified by experiments. This scheme is based on a cascade modulation scheme, which is used to reconfigure fundamental/doubling carrier frequency and [...] Read more.
A photonics-assisted binary/quaternary phase-coded microwave signal generator with fundamental/doubling reconfigurable carrier frequency applicable to digital I/O interfaces is proposed and has been verified by experiments. This scheme is based on a cascade modulation scheme, which is used to reconfigure fundamental/doubling carrier frequency and load the phase-coded signal, respectively. By controlling the radio frequency (RF) switch and the bias voltages of the modulator, the switching of the fundamental or doubling carrier frequency can be realized. When the amplitudes and sequence pattern of the two independent coding signals are set reasonably, binary or quaternary phase-coded signals can be realized. The sequence pattern of coding signals is applicable to digital I/O interfaces and can be directly generated through the IO interfaces of FPGA instead of an expensive high-speed arbitrary waveform generator (AWG) or other digital-to-analog conversion (DAC) systems. A proof-of-concept experiment is carried out, and the performance of the proposed system is evaluated from the aspects of phase recovery accuracy and pulse compression capability. In addition, the influence of residual carrier suppression and polarization crosstalk in non-ideal states on phase shifting based on polarization adjustment has also been analyzed. Full article
(This article belongs to the Special Issue Multi-Functional Integration Microwave Photonic Systems)
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10 pages, 1729 KiB  
Article
Photonics-Based Simultaneous DFS and AOA Measurement System without Direction Ambiguity
by Qingqing Meng, Zihang Zhu, Guodong Wang, He Li, Lingrui Xie and Shanghong Zhao
Micromachines 2023, 14(2), 457; https://doi.org/10.3390/mi14020457 - 15 Feb 2023
Cited by 2 | Viewed by 1778
Abstract
A novel scheme that can simultaneously measure the Doppler frequency shift (DFS) and angle of arrival (AOA) of microwave signals based on a single photonic system is proposed. At the signal receiving unit (SRU), two echo signals and the reference signal are modulated [...] Read more.
A novel scheme that can simultaneously measure the Doppler frequency shift (DFS) and angle of arrival (AOA) of microwave signals based on a single photonic system is proposed. At the signal receiving unit (SRU), two echo signals and the reference signal are modulated by a Sagnac loop structure and sent to the central station (CS) for processing. At the CS, two low-frequency electrical signals are generated after polarization control and photoelectric conversion. The DFS without direction ambiguity and wide AOA measurement can be real-time acquired by monitoring the frequency and power of the two low-frequency electrical signals. In the simulation, an unambiguous DFS measurement with errors of ±3 × 10−3 Hz and a −90° to 90° AOA measurement range with errors of less than ±0.5° are successfully realized simultaneously. It is compact and cost-effective, as well as has enhanced system stability and improved robustness for modern electronic warfare systems. Full article
(This article belongs to the Special Issue Multi-Functional Integration Microwave Photonic Systems)
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13 pages, 2479 KiB  
Article
Photonic-Assisted Scheme for Simultaneous Self-Interference Cancellation, Fiber Dispersion Immunity, and High-Efficiency Harmonic Down-Conversion
by He Li, Zihang Zhu, Congrui Gao, Guodong Wang, Tao Zhou, Xuan Li, Qingqing Meng, Yixiao Zhou and Shanghong Zhao
Micromachines 2023, 14(2), 339; https://doi.org/10.3390/mi14020339 - 28 Jan 2023
Cited by 2 | Viewed by 1946
Abstract
A photonic approach to the cancellation of self-interference in the optical domain with fiber dispersion immunity and harmonic frequency down-conversion function is proposed based on an integrated, dual-parallel, dual-drive Mach–Zehnder modulator (DP-DMZM). A dual-drive Mach–Zehnder modulator (DMZM) is used as an optical interference [...] Read more.
A photonic approach to the cancellation of self-interference in the optical domain with fiber dispersion immunity and harmonic frequency down-conversion function is proposed based on an integrated, dual-parallel, dual-drive Mach–Zehnder modulator (DP-DMZM). A dual-drive Mach–Zehnder modulator (DMZM) is used as an optical interference canceller, which cancels the self-interference from the impaired signal before fiber transmission to avoid the effect of fiber transmission on the cancellation performance. Another DMZM is used to provide carrier-suppressed, local-oscillation (LO)-modulated, high-order double optical sidebands for harmonic frequency down-conversion to release the strict demand for high-frequency LO sources. By regulating the DC bias of the main modulator, the signal of interest (SOI) can be down-converted to the intermediated frequency (IF) band after photoelectric conversion with improved frequency-conversion efficiency, immunity to the fiber-dispersion-induced power-fading (DIPF) effect, and effective signal recovery. Theoretical analyses and simulation results show that the desired SOI in the X and K bands with a bandwidth of 500 MHz and different modulation formats can be down-converted to the IF frequency. The self-interference noise with the 2 GHz bandwidth is canceled, and successful signal recovery is achieved after a 10 km fiber transmission. The recovery performance of down-converted signals and the self-interference cancellation depth under different interference-to-signal ratios (ISRs) is also investigated. In addition, the compensation performance of DIPF is verified, and a 6 dB improvement in frequency conversion gain is obtained compared with previous work. The proposed scheme is compact, cost-effective, and thus superior in wideband self-interference cancellation, long-range signal transmission, and effective recovery of weak desired signals. Full article
(This article belongs to the Special Issue Multi-Functional Integration Microwave Photonic Systems)
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