- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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Analytical Model for Photonic Compressive Sensing With Pulse Stretch and Compression
摘要： Compressive sensing (CS) with photonic technologies provides a promising way to acquire information with reduced measurement. Photonic CS with pulse stretch and compression has been proved to be capable of capturing wideband time-domain signals at extremely high equivalent sampling rate or images at high frame rate. In this approach, an input short pulse is first stretched by propagating through a dispersive medium and then the stretched pulse is modulated by a signal to be measured and a pseudorandom bit sequence (PRBS). The stretched pulse encoded with the signal and the PRBS is compressed in the time domain after passing a second dispersive medium with an opposite dispersion value. The time-domain compression of the stretched pulse was regarded as the integration function in the CS process (but it has never been proved), which is a key to realize time-domain imaging. In this paper, we fully investigate the theoretical framework of the photonic CS with optical pulse stretch and compression, and present an analytical model of the CS measurement matrix based on the analysis of the pulse stretch, modulation and compression, for the first time to our knowledge. Moreover, we prove the equivalence between the peak value of the compressed pulse and the integral value of the mixed signal, which is the basis of the analytical model. In addition, we further discuss the impact of the limited bandwidth of the employed photodetector on the measurement and the performance of signal reconstruction.
关键词： microwave photonics,Compressive sensing
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Photonics-based Multiband Radar Applying an Optical Frequency Sweeping Comb and Photonic Dechirp Receiving
摘要： A photonics-based multiband radar is proposed based on an optical frequency sweeping comb and photonic dechirp receiving. The proposed radar has a simple structure, and it is capable to simultaneously generate and process multiple in different frequency bands. Besides, the radar receiver can achieve fast or real-time signal processing with low-speed electronics. In the proof-of-concept experiment, a photonics-based dual-band radar working in K-band (19-22 GHz) and Ka-band (34-37 GHz) is demonstrated with a bandwidth of 3 GHz in each band and a sampling rate of 100 MSa/s in the receiver.
关键词： dechirp processing,multiband radar,optical frequency comb,microwave photonics
更新于2025-09-19 17:15:36
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[IEEE 2018 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - A Microwave Photonics Phase Synchronization Network for Distributed Coherent Aperture Radar
摘要： We propose a microwave photonics phase synchronization network for distributed coherent aperture radar for the first time. The demand of increasing detecting range leads to the development of large aperture radar. However, the large aperture radar is expensive and difficult to be transported. Distributed coherent aperture radar (DCAR) has been recently proposed to solve this problem. By coherently cooperating its small aperture radar beams, DCAR can achieve the superresolution of a large aperture radar. The challenges in the DCAR are to realize the phase synchronization of beams at the target. As a result, by coherently cooperating its small aperture radars, DCAR can achieve the performance of a large aperture radar.
关键词： distributed coherent aperture radar,Microwave photonics,phase synchronization networks
更新于2025-09-19 17:15:36
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[IEEE 2018 IEEE Photonics Conference (IPC) - Reston, VA (2018.9.30-2018.10.4)] 2018 IEEE Photonics Conference (IPC) - Microwave Photonics in Radar
摘要： An overview on the trend and main issues of radars and the potential of introducing photonics will be presented. The advantages in terms of frequency-agility, multi-band operation and performance on a single radar apparatus and on multiple input-multiple output radar systems will be detailed.
关键词： radar,microwave photonics
更新于2025-09-19 17:15:36
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Towards a New Generation of Radar Systems Based on Microwave Photonic Technologies
摘要： This paper reviews on the latest advances in microwave photonics applied to radar systems, tracing the evolutions of functionalities in the photonic radar toward a new generation of enhanced-performance systems. Photonics is demonstrated to enable a new generation of miniaturized, heterogeneous and distributed radars, i.e. future radars on chip with different features, working in different radio spectral regions, and organized in spatially distributed sensors for the enhanced detection of a wider range of target properties. In these systems, the use of photonics assures benefits in terms of frequency flexibility, accuracy and computational load reduction. Innovative capabilities supported by the photonic approach are presented, such as the use of coherent sparse bands for the synthesis of ultra-wide bands, the use of distributed sensors for multiple-input multiple-output detections, and the use of an ultra-wide band photonics-based receiver for radio frequency (RF) spectrum scanning. The presented novel concepts will open the way to new research activities both in photonic technology and radar systems, contributing to the development of a new generation of remote sensing systems. This expanding cross-fertilization will lead to exciting and challenging research activities in the years to come.
关键词： Microwave Photonics,MIMO Radars,Photonic Radar
更新于2025-09-19 17:15:36
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[IEEE 2018 28th International Telecommunication Networks and Applications Conference (ITNAC) - Sydney, Australia (2018.11.21-2018.11.23)] 2018 28th International Telecommunication Networks and Applications Conference (ITNAC) - Advances in microwave photonic signal processing for 5G and IoT Keynote Paper
摘要： Advances in microwave photonic signal processing for 5G and IoT are presented. Photonic signal processing offers a new powerful paradigm for processing high speed signals, due to its inherent advantages of wide bandwidth and immunity to electromagnetic interference. Recent trends are focused on realising photonic integrated circuits using silicon photonics that are compatible with CMOS electronics. Microwave photonic advances including versatile beamforming for phased array antennas, dispersion-free microwave-optical links, frequency conversion and filtering, and integrated high-resolution photonic sensors, are presented.
关键词： microwave photonics,photonic signal processing
更新于2025-09-19 17:15:36
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Diamond Brillouin laser in the visible
摘要： Brillouin lasers providing extremely narrow-linewidth are emerging as a powerful tool for microwave photonics, coherent communications, quantum processors, and spectroscopy. So far, laser performance and applications have been investigated for a handful of select materials and using guided-wave structures such as micro-resonators, optical fibers, and chip-based waveguides. Here, we report a Brillouin laser based on free-space laser action in an extreme optical material. Continuous-wave lasing 167 GHz from a 532 nm pump is demonstrated in diamond using a doubly resonant ring cavity, generating a pump-limited output power of 11 W. The Brillouin gain coefficient is measured to be 79 cm GW?1 with a linewidth of 12 MHz. These properties, along with an exceptionally high Brillouin frequency and wide transmission range, make diamond Brillouin lasers a promising high-power source of narrow-linewidth output and mm-wave beat notes.
关键词： narrow-linewidth,quantum processors,microwave photonics,diamond,Brillouin lasers,spectroscopy,coherent communications
更新于2025-09-19 17:13:59
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Complete Scene Reconstruction by Merging Images and Laser Scans
摘要： Optical fibre transmission has enabled greatly increased transmission rates with 10 Gb/s common in local area networks. End users find wireless access highly convenient for mobile communication. However, limited spectrum availability at microwave frequencies results in per-user transmission rates limited to much lower values, e.g., 500 Mb/s for 5-GHz band IEEE 802.11ac. Extending the high data-rate capacity of optical fiber transmission to wireless devices requires greatly increased carrier frequencies. This paper will describe how photonic techniques can enable ultrahigh capacity wireless data distribution and transmission using signals at millimeter-wave and TeraHertz (THz) frequencies.
关键词： photonic integrated circuits,microwave photonics,Broadband communication,optical mixing,optical heterodyne,millimeter (mm)-wave generation,optical phase lock loops,semiconductor lasers
更新于2025-09-19 17:13:59
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[IEEE 2019 International Workshop on Fiber Optics in Access Networks (FOAN) - Sarajevo, Bosnia and Herzegovina (2019.9.2-2019.9.4)] 2019 International Workshop on Fiber Optics in Access Networks (FOAN) - Optical mixing of two optical waves from a helium-neon gas laser to generate a stable continuous-wave radio-frequency signal
摘要： An approach to the generation of a radio-frequency signal using a dual longitudinal mode helium–neon (HeNe) gas laser and the optical mixing technique is proposed and demonstrated. Several approaches using lasers and photodetectors with different characteristics give a detailed insight into the potential and utility of the optical mixing of two optical waves to generate a radio-frequency reference source. A low-phase-noise radio-frequency signal is observed by a signal-source analyzer because the two lasing modes share the same gain medium in the few-centimeters-long cavity and the relative phase irregular shifting ?uctuations between the two wavelengths are low. The observed phase noise below -100 dBc/Hz at the offset of 1 kHz from the continuous-wave tone at the central frequency of 723 MHz indicates that the dual-mode-cavity gas laser ef?ciently suppresses the wavelength ?uctuations between the lightwave modes, enabling a stable radio-frequency signal to be generated.
关键词： RF signal generation,Microwave photonics,Wave mixing
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE Conference on Power Electronics and Renewable Energy (CPERE) - Aswan City, Egypt (2019.10.23-2019.10.25)] 2019 IEEE Conference on Power Electronics and Renewable Energy (CPERE) - Analysis, Design and Simulation of a DC Photovoltaic Microgrid with Electric Vehicle Charging Capability
摘要： Optical fibre transmission has enabled greatly increased transmission rates with 10 Gb/s common in local area networks. End users find wireless access highly convenient for mobile communication. However, limited spectrum availability at microwave frequencies results in per-user transmission rates limited to much lower values, e.g., 500 Mb/s for 5-GHz band IEEE 802.11ac. Extending the high data-rate capacity of optical fiber transmission to wireless devices requires greatly increased carrier frequencies. This paper will describe how photonic techniques can enable ultrahigh capacity wireless data distribution and transmission using signals at millimeter-wave and TeraHertz (THz) frequencies.
关键词： optical heterodyne,optical mixing,optical phase lock loops,millimeter (mm)-wave generation,microwave photonics,photonic integrated circuits,Broadband communication,semiconductor lasers
更新于2025-09-19 17:13:59