Open AccessPhotonic high-fidelity storage and Doppler frequency shift of broadband RF pulse signals
Author(s) -
Z Ding,
Fei Yang,
Jiejun Zhao,
Rui Wu,
Haiwen Cai,
Mingjun Wang,
Yongxiang Weng,
Zixin Zhao
Publication year - 2019
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.27.034359
Subject(s) - extinction ratio , radio frequency , optics , photonics , true time delay , doppler effect , sideband , materials science , physics , radio over fiber , optoelectronics , optical fiber , wavelength , telecommunications , phased array , computer science , astronomy , antenna (radio)
A microwave photonic system which can simultaneously realize the functions of rapidly tunable Doppler frequency shift (DFS) and high fidelity storage of broadband RF signals is proposed and verified. Single-sideband carrier-suppression modulation combined with dual-AOM frequency shifting ensures large-range and fast-responding DFS. And time-gated semiconductor amplifier (SOA) based fiber delay loop can realize high-fidelity RF pulse storage with high extinction ratio switching and amplification characteristics of time-gated SOA. A spurious rejection ratio greater than 40 dB, tuning range of DFS greater than ± 3 MHz, response speed of DFS less than 30 ns, and high fidelity storage of 4 GHz-12 GHz RF signals with greater than 381 circulations (corresponding 80 us delay time) are realized by the proposed structure. The maximum signal-to-noise ratio (SNR) is 13.6 dB within 381 circulations. Based on the experimental data, the simulation results show that the delay time also could be extended to 10 times more.