Broadband Microwave Photonic Channelizer with 18 Channels Based on Acousto-Optic Frequency Shifter

A microwave photonic channelizer can achieve instantaneous reception of ultra-wideband signals and effectively avoid electronic bottleneck; therefore, it can be perfectly applied to a wideband radar system and electronic warfare. In channelization schemes based on an optical frequency comb (OFC), th...

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Bibliographic Details
Published inPhotonics Vol. 10; no. 2; p. 107
Main Authors Chen, Bo, Dong, Qunfeng, Cao, Biao, Zhai, Weile, Gao, Yongsheng
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.01.2023
Subjects
Acousto-optics
AOFS
Bandwidths
Broadband
Channeling
Channelization
Channels
Crosstalk
Electromagnetism
Electronic warfare
Experiments
Frequency shifters
image rejection
Microwave devices
Microwave photonics
Optical communication
Optical frequency
Optics
phononic channelization
Radar equipment
Radio frequency
Ultrawideband
Wave division multiplexing
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Summary:A microwave photonic channelizer can achieve instantaneous reception of ultra-wideband signals and effectively avoid electronic bottleneck; therefore, it can be perfectly applied to a wideband radar system and electronic warfare. In channelization schemes based on an optical frequency comb (OFC), the number of comb lines usually depends on that of the sub-channels. In order to improve the utilization rate of the comb lines of OFC, we propose a scheme to shift the frequency of OFC by using an acousto-optic frequency shifter (AOFS), which can obtain three times the number of sub-channels of the comb lines of an OFC. In order to simplify the experiment, only a three-line OFC is used in the experiment. A three-line local oscillator (LO) OFC is frequency-shifted up and down by two AOFSs, and nine optical LO signals with different frequencies are obtained, thereby realizing the simultaneous reception of eighteen sub-channels. The proposed scheme enjoys a large number of sub-channels and minimal channel crosstalk. Experimental results demonstrate that a 9-GHz bandwidth RF signal covering 10–19 GHz is divided into 18 sub-channels with a sub-bandwidth of 500 MHz. The image rejection ratio of the sub-channels is about 23 dB, and the spurious-free dynamic range (SFDR) of the receiver can reach 98 dB·Hz2/3.
ISSN:2304-6732
2304-6732
DOI:10.3390/photonics10020107