title: Experimental investigation on multi-dimensional digital predistortion for multi-band radio-over-fiber systems.
abstract: The recently-proposed multi-dimensional digital predistortion (DPD) technique is experimentally investigated in terms of nonlinearity order, memory length, oversampling rate, digital-to-analog conversion resolution, carrier frequency dependence and RF input power tolerance, in both directly-modulated and externally-modulated multi-band radio-over-fiber (RoF) systems. Similar characteristics of the multi-dimensional digital predistorter are identified in directly-modulated and externally-modulated RoF systems. The experimental results suggest implementing a memory-free multi-dimensional digital predistorter involving nonlinearity orders up to 5 at 2 × oversampling rate for practical multi-band RoF systems. Using the suggested parameters, the multi-dimensional DPD is able to improve the RF input power tolerance by greater than 3dB for each band in a two-band RoF system, indicating an enhancement of RF power transmitting efficiency.
authors.forename: Hao
authors.initials: H
authors.lastname: Chen
authors.forename: Jianqiang
authors.initials: J
authors.lastname: Li
authors.forename: Kun
authors.initials: K
authors.lastname: Xu
authors.forename: Yinqing
authors.initials: Y
authors.lastname: Pei
authors.forename: Yitang
authors.initials: Y
authors.lastname: Dai
authors.forename: Feifei
authors.initials: F
authors.lastname: Yin
authors.forename: Jintong
authors.initials: J
authors.lastname: Lin