Journal
JOURNAL OF LIGHTWAVE TECHNOLOGY
Volume 38, Issue 21, Pages 5962-5972Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JLT.2020.3007436
Keywords
Radio frequency; Optical fibers; Optical polarization; Optical imaging; Optical receivers; Microwave photonics; I; Q balanced detection; image-reject; Sagnac loop
Funding
- National Nature Science Foundation of China [61701412]
- National Postdoctoral Program for Innovative Talents [BX201700197]
- China Postdoctoral Science Foundation [2017M623238]
- National Key Laboratory of Science and Technology on Space Microwave [2018SSFNKLSMT-11, HTKJ2019KL504011]
- National Advanced Research Foundation of China [614241105010717]
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Image-reject radio frequency (RF) receiver is the backbone of modern RF systems, but often suffers from limited bandwidth, local oscillator (LO) leakage, even-order distortion, and I/Q imbalance. A wideband photonic image-reject RF receiver based on two phase-modulators (PMs) in a Sagnac loop and an I/Q balanced detector is proposed. In the experiment, excellent I/Q amplitude balance (<0.8 dB) and phase balance (<0.7 degrees) over a wide operating frequency from 8 to 40 GHz are achieved. Due to balanced detection, the even-order distortion and dc-offset are significantly suppressed. Combined with an analog intermediate frequency (IF) quadrature coupler, the image-reject RF receiver is implemented with a spurious free dynamic range (SFDR) of 99.4 dB center dot Hz(2/3) and an image rejection of 50.3 dB. An antenna remoting RF vector signal with image interference is down-converted to the IF domain. Benefiting from the significant image rejection and Sagnac loop architecture, a good constellation diagram and a low error vector magnitude (EVM) of the desired signal are obtained.
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