Dynamic range improvement strategy for Mach-Zehnder modulators in microwave/millimeter-wave ROF links

被引：20

作者：

Zhang, Guoqiang ^{[1
]}

Li, Shangyuan ^{[1
]}

Zheng, Xiaoping ^{[1
]}

Zhang, Hanyi ^{[1
]}

Zhou, Bingkun ^{[1
]}

Xiang, Peng ^{[1
,2
]}

机构：

[1] Tsinghua Univ, Dept Elect Engn, Tsinghua Natl Lab Informat Sci & Technol, Beijing 100084, Peoples R China

[2] PLA Univ Sci & Technol, Inst Commun Engn, Nanjing 210007, Jiangsu, Peoples R China

来源：

OPTICS EXPRESS | 2012年 / 20卷 / 15期

基金：

中国博士后科学基金;

关键词：

RADIO; SYSTEM;

D O I：

10.1364/OE.20.017214

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Intermodulation distortions are generated by Mach-Zehnder modulators when they are driven by signals with certain bandwidth in microwave (MW) and millimeter-wave (MMW) radio-over-fiber (ROF) links. The optical spectral structure of the distorted optical signal is investigated. A strategy to improve the dynamic range of MW and MMW ROF links directly in the optical domain is proposed and experimentally demonstrated. Based on optical spectrum processing, the third-order intermodulation distortions (IMD3s) of the generated signals are suppressed. A 107.2dB center dot Hz(2/3) spurious-free dynamic range (SFDR) of the MW/MMW ROF link is obtained, which is improved more than 20dB. A 16QAM signal is transmitted in the system and the error vector magnitude (EVM) is measured with and without the proposed technique. The influence of the nonlinearity of modulators on EVM is almost completely eliminated. (C) 2012 Optical Society of America

引用

页码：17214 / 17219

页数：6

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