- 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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Highly Flexible and Voltage Based Wavelength Tunable Biosensor
摘要： A plasmonic absorber as a biosensor based on the highly flexible electro-optic material is numerically investigated. The structure demonstrates multispectral high absorption in visible and unity absorption in the near-infrared range. The resonant wavelengths are extremely sensitive to the applied voltage, variation in geometric parameters, and the refractive index of the background material, resulting in wavelength-tunable absorption that can be used for tunable sensors and filters. The refractive index based sensitivity is calculated on different voltages to adjust the resonances to the desired point in a wide waveband for detecting a large number of different biomaterials. The electro-optic tunability can be used to reduce fabrication errors and use of scaling. In addition, strong field absorption, broad resonant peaks, and wide incident angle absorption versatility are found in the proposed structure which can be applied for energy harvesting, infra-red detection, and surface-enhanced Raman spectroscopy purposes.
关键词： electro-optic,plasmonics,detection,photonics,nanosystems,metasurface
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) - On-chip forward bandpass mode conversion based on two cascaded Bragg gratings
摘要： Forward conversion between two guided modes can be achieved with the aid of an additional mode based on two cascaded Bragg reflection processes. We have investigated and verified the mode conversion by simulation and experiment.
关键词： mode converter,Bragg grating,silicon 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 Asia Communications and Photonics Conference (ACP) - Hangzhou, China (2018.10.26-2018.10.29)] 2018 Asia Communications and Photonics Conference (ACP) - Photonic generation of microwave frequency shift keying signals based on dual parallel Mach-Zehnder modulator structure
摘要： A novel scheme to generate microwave frequency shift keying (FSK) signals is proposed and verified by a simulation. The main devices are two single-drive Mach Zehnder modulators (MZM) and a commercial phase modulator (PM). They are parallelly settled to perform the FSK signal generation. In this simulation work, two MZMs are driven by the RF signals with a phase difference which is introduced by an electrical phase shifter (EPS). Simultaneously, the PM is driven by a binary coding signal. The simulation results show that when the two MZMs are biased at the maximum transmission point (MATP), a microwave FSK signal can be obtained with the frequency is two times as large as the RF frequency for bit '0' and four times as large as the RF frequency for bit '1', respectively. It should be noted that the system shows excellent adaption to the non-ideal extinction radio and the inherent inaccurate phase shift of the electrical phase shifter. Therefore, the generated microwave FSK signal can meet the requirement of high-frequency applications.
关键词： high-frequency applications,microwave signal generation,microwave photonics,frequency shift keying
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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Hybrid Graphene-Silicon Based Polarization-Insensitive Electro-Absorption Modulator with High-Modulation Efficiency and Ultra-Broad Bandwidth
摘要： Polarization-insensitive modulation, i.e., overcoming the limit of conventional modulators operating under only a single-polarization state, is desirable for high-capacity on-chip optical interconnects. Here, we propose a hybrid graphene-silicon-based polarization-insensitive electro-absorption modulator (EAM) with high-modulation efficiency and ultra-broad bandwidth. The hybrid graphene-silicon waveguide is formed by leveraging multi-deposited and multi-transferred methods to enable light interaction with graphene layers in its intense field distribution region instead of the commonly used weak cladding region, thus resulting in enhanced light–graphene interaction. By optimizing the dimensions of all hybrid graphene-silicon waveguide layers, polarization-insensitive modulation is achieved with a modulation efficiency (ME) of ~1.11 dB/μm for both polarizations (ME discrepancy < 0.006 dB/μm), which outperforms that of previous reports. Based on this excellent modulation performance, we designed a hybrid graphene-silicon-based EAM with a length of only 20 μm. The modulation depth (MD) and insertion loss obtained were higher than 22 dB and lower than 0.23 dB at 1.55 μm, respectively, for both polarizations. Meanwhile, its allowable bandwidth can exceed 300 nm by keeping MD more than 20 dB and MD discrepancy less than 2 dB, simultaneously, and its electrical properties were also analyzed. Therefore, the proposed device can be applied in on-chip optical interconnects.
关键词： integrated optical devices,electro-optic modulator,silicon photonics,graphene
更新于2025-09-19 17:15:36