Filter-Free Photonic Image-Rejection Down-Conversion for Distributed Antenna Applications

Photonics-assisted frequency conversion based on cascaded modulators is an effective way to satisfy the requirements of distributed antenna array applications. A filter-free photonic image-rejection down-converter with immunity to dispersion-induced power fading is proposed and demonstrated. The rad...

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Bibliographic Details
Published in:IEEE photonics journal 2021-04, Vol.13 (2), p.1-10
Main Authors: Wang, Dayong, Yang, Feng, Wang, Yunxin, Chen, Zhiyu, Yang, Dengcai, Wu, Fuzheng
Format: Article
Language:English
Subjects:
Amplitude modulation
Antenna arrays
Antennas
Bandwidths
Conversion
distributed antenna
Down-converters
Dual polarization (waves)
Image filters
image rejection
Mach-Zehnder interferometers
Microwave photonics
Modulation
Modulators
Optical fibers
Optical filters
Phase shifters
photonic down-conversion
Photonics
Polarization
Quadratures
Radio frequency
Radio signals
Rejection
RF signals
Single sideband transmission
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Summary:Photonics-assisted frequency conversion based on cascaded modulators is an effective way to satisfy the requirements of distributed antenna array applications. A filter-free photonic image-rejection down-converter with immunity to dispersion-induced power fading is proposed and demonstrated. The radio frequency (RF) signal from the distributed antenna unit is injected into a dual-drive Mach-Zehnder modulator (DDMZM) through an electrical 90° hybrid coupler (HC), and a single-sideband (SSB) signal is realized. It is then transmitted to the center office by an optical fiber link. At the center office, the modulated RF signal is injected into a dual-polarization dual-parallel MZM (DP-DPMZM) after a polarization controller (PC). Afterwards, an LO signal remodulates it through the Y-DPMZM, and carrier-suppressed SSB modulation is fulfilled via another electrical 90° HC. After the power splitting, quadrature I and Q IF signals can be obtained by a photonics-based continuously adjustable phase shifter. Through a combination of the I/Q IF signals with a low-frequency electrical 90° HC, a photonics image-rejection down-converter based on phase cancellation is realized. Moreover, no optical filter is required; thus, the image-rejection down-converter can work with a large bandwidth. The proposed filter-free photonic image-rejection down-converter is theoretically analyzed and experimentally verified.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2021.3064553