High-dynamic-range wireless-over-fiber link using feedforward linearization

被引：54

作者：

Ismail, Tabassam ^{[1
]}

Liu, Chin-Pang ^{[1
]}

Mitchell, John E. ^{[1
]}

Seeds, Alwyn J. ^{[1
]}

机构：

[1] UCL, Dept Elect & Elect Engn, London WC1E 7JE, England

来源：

JOURNAL OF LIGHTWAVE TECHNOLOGY | 2007年 / 25卷 / 11期

基金：

英国工程与自然科学研究理事会;

关键词：

feedforward linearization; nonlinear distortion; spurious-free dynamic range (SFDR); uncooled lasers; wireless over fiber (WoF);

D O I：

10.1109/JLT.2007.906823

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

We demonstrate the implementation of feedforward linearization at 5 GHz, which is the highest operating frequency yet reported, with 500-MHz linearization bandwidth having at least 24-dB distortion suppression. Simultaneous reduction of 26-dB third-order intermodulation distortion and 7-dB laser-noise reduction is achieved at 5.2 GHz, leading to enhanced spurious-free dynamic range of 107 dB (1 Hz) in a directly modulated uncooled semiconductor laser for applications in wireless-over-fiber (WoF) systems. This paper also provides detailed analysis on feedforward, theoretical distortion reduction, criteria for component selection, and the effect of dispersion. The effectiveness of feedforward in a multichannel system is demonstrated at 5.8 GHz for fixed wireless systems, such as WiMAX. These results suggest that the feedforward-linearization arrangement can make practical multichannel and multioperator WoF systems.

引用

页码：3274 / 3282

页数：9

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