Photonic downconversion link with linearization and full spectrum utilization

Li, Gufeng; Shang, Tao; Gao, Yan; Zhang, Yinling; Chen, Dan

doi:10.1109/mwp.2017.8168665

Cited by 2 publications

(1 citation statement)

References 16 publications

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“…Nevertheless, the nonlinearity of the modulator is one of the main problems that may lead to the intermodulation distortion (IMD), in particular the thirdorder IMD (IMD3), which would degrade the spurious free dynamic range (SFDR) [5] . So far, several effective schemes have been reported to improve the linearity of downconversion links, including (i) employing cascaded modulators combined with an optical filter [6][7][8] , and (ii) using one dual-polarization quadrature phase shift keying (QPSK) Mach-Zehnder modulator (MZM) and two photodetectors (PDs) [9] . However, most microwave photonic-based systems, in particular the array radar systems and electronic reconnaissance systems, are built up based on simple intensity modulation and direct detection (IM-DD).…”

Section: Introductionmentioning

confidence: 99%

Linearized microwave downconversion link based on fast and intelligent impairment equalization for noncooperative systems

Chen¹,

Zhong²,

Jiang

et al. 2023

中国光学快报

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We experimentally demonstrated the use of intelligent impairment equalization (IIE) for microwave downconversion link linearization in noncooperative systems. Such an equalizer is realized based on an artificial neural network (ANN). Once the training process is completed, the inverse link transfer function can be determined. With the inverse transformation for the detected signal after transmission, the third-order intermodulation distortion components are suppressed significantly without requiring any prior information from an input RF signal. Furthermore, fast training speed is achieved, since the configuration of ANN-based equalizer is simple. Experimental results show that the spurious-free dynamic range of the proposed link is improved to 106.5 dB • Hz 2/3 , which is 11.3 dB higher than that of a link without IIE. Meanwhile, the training epochs reduce to only five, which has the potential to meet the practical engineering requirement.

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