光纤无线电技术中的关键问题研究

Analysis of Key Problems in Radio over Fiber Technique

为满足未来的宽带、无线、环保节能的接入需求,详细分析了ROF(Radio Over Fiber)技术中的关键问题,包括中心局的外调制器的调制非线性、光纤链路中的色散以及微波功率控制问题,并针对乡村和城市不同的实际需求分别进行讨论。提出了优化系统中信号功率控制方案,克服了光纤链路色散带来的功率衰落影响,从而实现了节能环保的宽带无线ROF接入。

Broadband and wireless have become the trend of the development of communications with the pace of the global information technology.As the key technology of 4G mobile communications,ROF（Radio Over Fiber） is no doubt the most promising solution for broadband and wireless access in the future.The key problems in ROF are analyzed in detail,including the nonlinearity of the modulator in the centre office,the dispersion in the fiber link and the power control of microwave signal.Optimized solution is given according to different applications of rural and urban area.Furthermore,the power fading induced in the dispersion of the fiber link is overcome.As a result,energy conservative,broadband and wireless ROF link is achievable.