Enhanced Spurious-Free Dynamic Range in Intensity-Modulated Analog Photonic Link Using Digital Postprocessing

IEEE Photonics Journal

Yan Cui¹  Qiang Lv²  Jintong Lin³  Kun Xu⁴  Jianqiang Li⁴  Feifei Yin⁵  Yitang Dai⁵ 

[1] $^{1}$ State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China;$^{2}$The 54th Research Institute of CETC , Shijiazhuang, China;State Key Laboratory of Information Photonics and Optical Communications , Beijing University of Posts and Telecommunications, Beijing, China;State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications , Beijing, China;State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, China;

关键词: Radio frequency photonics;    fiber optics systems;    digital signal processing;   

DOI  :  10.1109/JPHOT.2014.2308196

来源: DOAJ

【 摘 要 】

In this paper, a post digital linearization technique is proposed and demonstrated for a conventional intensity-modulation direct-detection analog photonic link. Instead of precisely emulating the transfer function of the whole nonlinear system in the digital domain, the key distortion information is directly acquired from hardware. By low biasing the Mach-Zehnder modulator, linearization can be achieved through simply multiplying the distorted signal by the coreceived low-pass band. Theory analysis shows that only the bias angle should be known by the algorithm, whereas the simulation shows adequate tolerance. The low bias angle also results in an improved link gain. The experiment shows a well-suppressed third-order intermodulation distortion (IMD3). With the optical down conversion, we demonstrate a spurious-free dynamic range increasing from 103.2 to 123.3 dB in a 1-Hz bandwidth.

【 授权许可】

Unknown