Zobrazeno 1 - 10
of 109
pro vyhledávání: '"Hao Chi"'
Publikováno v:
IEEE Journal of Microwaves, Vol 1, Iss 3, Pp 787-803 (2021)
A chirped microwave waveform with a large time-bandwidth product (TBWP) can find important applications in modern radar systems and microwave imaging systems. Microwave photonics, a field that studies the generation and processing of microwave signal
Autor:
Hao Chi, Qiulin Zhang
Publikováno v:
Microwave and Optical Technology Letters. 63:2670-2674
Publikováno v:
IEEE Photonics Journal, Vol 12, Iss 5, Pp 1-8 (2020)
We propose and experimentally demonstrate a novel and simple approach to identifying both the direction and value of Doppler frequency shift (DFS) in this paper. A pair of phase modulators, as well as a dispersion medium in between them, are employed
Publikováno v:
IEEE Access, Vol 8, Pp 150242-150247 (2020)
The major limitation of the photonic digitization schemes based on the phase-shifting of modulation transfer function lies in its relatively low bit resolution, which is log2(2N ), where N is the number of optical channels or modulators. In this pape
Publikováno v:
IEEE Photonics Journal, Vol 12, Iss 1, Pp 1-9 (2020)
IEEE Photonics Journal, 12(1):8936887. Institute of Electrical and Electronics Engineers
IEEE Photonics Journal, 12(1):8936887. Institute of Electrical and Electronics Engineers
A novel approach to realize broadband microwave spectrum sensing based on photonic RF channelization and compressive sampling (CS) is proposed. The photonic RF channelization system is used to slice the input broadband signal into multiple sub-channe
Publikováno v:
Optics Communications. 446:72-76
A novel approach for photonic quantization using dual-output Mach–Zehnder modulators (DOMZMs) and balanced photodetectors (BPDs) is proposed and experimentally demonstrated. Based on the phase-shifting technique, all DOMZMs used in the scheme have
Publikováno v:
Photonics, Vol 8, Iss 501, p 501 (2021)
A novel photonic approach to generating switchable multi-format chirp waveforms using a dual-drive dual-parallel Mach–Zehnder modulator (DD-DPMZM) is proposed and experimentally demonstrated. By properly controlling the bias voltage on the DD-DPMZM
Publikováno v:
Applied optics. 60(22)
Photonic time-stretch (PTS) has been extensively studied due to its great potential in analog-to-digital converters. Here, we propose and demonstrate a PTS system based on phase modulation for sub-octave applications. Different from the PTS system us
Publikováno v:
Optics express. 29(11)
Photonic compressive sensing (CS) has attracted great research interest for its potentials in the acquisition of wideband sparse signals with relatively low sampling rate. The photonic CS scheme based on optical mixing using a spectral shaper can rea
Publikováno v:
Optics express. 29(11)
In this paper, we propose a novel photonic approach for generating arbitrary waveform. The approach is based on the property of real-time Fourier transform in the temporal Talbot effect, where the spectrum of the modulating analog signal is converted