Open AccessUltrahigh spectral resolution single passband microwave photonic filter
Author(s) -
Hua Wen,
Bo Xu,
Kun Zhai,
Jia Zheng Sun,
Jian Wang,
Xin Hao Du,
Young-Woo Jin,
Wei Chen,
Wei Li,
Ning Hua Zhu,
Ming Li
Publication year - 2021
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.436173
Subject(s) - passband , optics , microwave , free spectral range , spectral resolution , photonics , center frequency , band pass filter , physics , materials science , telecommunications , computer science , spectral line , wavelength , astronomy
Microwave photonic filters (MPFs) with only one ultra-narrow passband are able to provide high frequency selectivity and wide spectral range, and they are of great importance in radio-frequency (RF) signal processing. However, currently all MPFs are limited by trade-offs between key parameters such as spectral resolution and range, tunability, and stability. Here, we report the first demonstration of a single passband MPF with unprecedented performance including ultrahigh spectral resolution of 650 kHz, 0-40 GHz spectral range, and high stability of center frequency drifting within ±50 kHz. This record performance is accomplished by breaking the amplitude equality of a phase-modulated signal via a Brillouin dynamic grating (BDG) which has an ultra-narrow reflection spectrum of sub-MHz. The results point to new ways of creating high performance microwave photonic systems, such as satellite and mobile communications, radars, and remote-sensing systems.