Journal
OPTICS COMMUNICATIONS
Volume 520, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.optcom.2022.128518
Keywords
Microwave photonics; Multi-frequency; Phase shift; Up-conversion
Categories
Funding
- National Key Research and Development Program of China [2018YFB1801001]
- National Natural Science Foundation of China [62175038]
- Guangdong Introducing Innovative and Entrepreneurial Teams of The Pearl River Talent Recruitment Program [2019ZT08X340]
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A broadband multi-frequency microwave photonic up-conversion scheme with a tunable phase shift is proposed and demonstrated. By modulating and superposing the optical signal, multi-frequency microwave signals are obtained and the phase can be continuously adjusted.
A broadband multi-frequency microwave photonic up-conversion scheme with a tunable phase shift is proposed and demonstrated based on a cavity-less ultrashort optical pulse source and a dual-polarization dual-parallel Mach-Zehnder modulator (DP-DPMZM). In this scheme, the intermediate-frequency (IF) signal is loaded onto the optical frequency comb from a cavity-less ultrashort pulse source via carrier-suppressed double-sideband (CS-DSB) modulation by using a DP-DPMZM and a 90 electric hybrid coupler (HC). Through mutual beating between multi-groups of optical modulation sidebands and multi-tone optical carrier at the photodetector (PD), multi-frequency up-converted microwave signals are obtained after coherent superposition. Meanwhile, the phase of the generated signals can be continuously tuned through varying the bias voltages of the DP-DPMZM. Simulation results show that the multi-frequency up-conversion is with a 3-dB operation bandwidth of 36 GHz and a phase shift tuning range over 360. Hence, this scheme is a potential candidate to simultaneously realize broadband multi-frequency operation and generate the large-scale tunable phase shift in modern radar systems.
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