Ismail, T; Liu, CP; Mitchell, JE; Seeds, AJ; (2007) High-dynamic-range wireless-over-fiber link using feedforward linearization. J LIGHTWAVE TECHNOL , 25 (11) 3274 - 3282. 10.1109/JLT.2007.906823.
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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.
|Title:||High-dynamic-range wireless-over-fiber link using feedforward linearization|
|Keywords:||feedforward linearization, nonlinear distortion, spurious-free dynamic range (SFDR), uncooled lasers, wireless over fiber (WoF), SEMICONDUCTOR-LASERS, INTENSITY NOISE, COMPENSATION, REDUCTION, DISTORTION, SYSTEMS, RADIO|
|UCL classification:||UCL > School of BEAMS > Faculty of Engineering Science > Electronic and Electrical Engineering|
UCL > School of BEAMS > Faculty of Engineering Science > Engineering Science Faculty Office
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