Results 71 to 80 of about 415,615 (181)

Ultralow Phase Noise Optoelectronic Oscillator and Its Application to a Frequency Synthesizer

Leida xuebao, 2019
We propose a novel injection-locked OptoElectronic Oscillator (OEO) with ultralow phase noise based on two cascaded phase modulators, which is further applied to construct a frequency synthesizer.
LIU Shifeng, XU Xiaorui, ZHANG Fangzheng, LIU Peng, KANG Xiaochen, YANG Huashan, PAN Shilong   +6 more
doaj   +1 more source

Distributed Acoustic Sensing Based on Coherent Microwave Photonics Interferometry. [PDF]

Sensors (Basel), 2021
Hua L, Zhu X, Cheng B, Song Y, Zhang Q, Wu Y, Murdoch LC, Dauson ER, Donahue CM, Xiao H.   +9 more
europepmc   +1 more source

High‐resolution 3D imaging by microwave photonic time division multiplexing‐multiple‐input‐multiple‐output radar with broadband digital beamforming

IET Radar, Sonar & Navigation
A broadband microwave photonic time division multiplexing (TDM) multiple‐input‐multiple‐output (MIMO) radar is proposed in which photonic frequency quadrupling is adopted to generate broadband radar signals and photonic frequency mixing is implemented ...
Yuewen Zhou, Fangzheng Zhang, Jiayuan Kong, Shilong Pan   +3 more
doaj   +1 more source

Continuous Rapid⁃Beam⁃Scanning and Circular⁃Polarized Leaky⁃Wave Antenna Based on Meandering⁃SIW with Defected Ground Structures

Transactions of Nanjing University of Aeronautics and Astronautics
A compact high-scanning-rate circular-polarized leaky-wave antenna （LWA） based on a meandering substrate integrated waveguide （SIW） with defected ground structures （DGSs） is presented.
RUAN Yizheng, NIU Zhenyi, CHEN Weikang, ZHAO Yongjiu, PAN Shilong   +4 more
doaj   +1 more source

Concept for Continuously Tunable Output Filters for Digital Transmitter Architectures

IEEE Access, 2019
This paper presents a novel output filter approach for continuously frequency-tunable digital power amplifiers, suitable for future seamless and band-less applications in 5G, e.g. for cognitive radios (CR). The presented tunable output filter is based on
Christian Schuster, Lukas Schynol, Andreas Wentzel, Florian Huhn, Ersin Polat, Sonke Schmidt, Rolf Jakoby, Wolfgang Heinrich, Holger Maune   +8 more
doaj   +1 more source

Low-Coherence Interferometry Using Microwave Photonics for Multilayered Samples [PDF]

, 2018
[EN] A photonic structure is proposed by exploiting the advantages of the Microwave Photonics technology over conventional low coherence interferometry.
Jose Mora, Mora Almerich, José, Benítez-González, Jesús, Jesus Benitez   +3 more
core   +1 more source

A New Method of Robust Ground Moving Target Detection Under Different Backgrounds of Airborne SAR Based on Spatial Deformable Module

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
Combined with the synthetic aperture radar (SAR) imaging algorithm, diverse simulation sample sets of ground moving targets are constructed to tackle the problem of insufficient measured data in the SAR ground moving target indication algorithm based on ...
He Yan, Hui Liu, Jialin Hao, Wenshuo Xu, Jingdong Zhang, Di Wu, Xudong Wang, Gong Zhang, Daiyin Zhu   +8 more
doaj   +1 more source

Microwave and Terahertz Generation Based on Photonically Assisted Microwave Frequency Twelvetupling With Large Tunability

IEEE Photonics Journal, 2010
A novel approach to achieving photonically assisted microwave frequency twelvetupling with large frequency tunability is proposed and demonstrated. The frequency twelvetupling is realized through a joint operation of polarization modulation, four-wave ...
Wangzhe Li, Jianping Yao
doaj   +1 more source

Frequency-modulated continuous-wave laser ranging beyond the limits of bandwidth and phase noise

APL Photonics
Frequency-modulated continuous-wave (FMCW) laser ranging typically applies an interferometer and linear frequency-modulated (LFM) signals to measure the distance, in which precision and resolution are limited by the phase noise of laser and the bandwidth
Xiuyuan Sun, Zhongyang Xu, Hangtian Lu, Qiyue Yu, Kai Wang, Shilong Pan   +5 more
doaj   +1 more source

Noise and signal modeling of various VCSEL structures [PDF]

, 2004
Current evolution in Datacoms and Gigabit Ethernet have made 850nm Vertical Cavity Surface Emitting Lasers(VCSEL) the most important and promising emitter.
Perchoux, Julien, Jean-Claude Mollier, Martin Grabherr, Grabherr, Martin, Rissons, Angélique, Julien Perchoux, Mollier, Jean-Claude, Angelique Rissons   +7 more
core   +1 more source