采用两个级联外部调制器产生四倍频光载毫米波的光纤无线通信系统  

A Radio Over Fiber System Based on Two External Modulator for Optical Millimeter Generation with Photonic Frequency Quadruple

作　　者：陈罗湘[1,2] 卢嘉[1] 董泽[1] 陈林[1] 余建军[1] 

机构地区：[1]湖南大学计算机与通信学院、微纳光电器件及应用教育部重点实验室,湖南长沙410082 [2]湘潭职业技术学院通信工程系,湖南湘潭411102

出　　处：《中国激光》2008年第12期1910-1913,共4页Chinese Journal of Lasers

基　　金：国家863计划(2007AA01Z263);河南省自然科学基金(06JJ50108)资助项目

摘　　要：研究了一种采用两个级联外部调制器基于光载波抑制原理产生四倍频毫米波的光纤无线通信(ROF)系统。在中心站利用电混频器产生副载波复用信号,通过第一个外部调制器产生两倍射频(RF)信号的光载毫米波信号,再通过第二个外部调制器产生四倍射频信号的光载毫米波。实验显示采用频率为10 GHz的射频信号源和2.5 Gbit/s的数据基带信号混频通过两个级联外部调制器后产生毫米波的频率为40 GHz,并且在单模光纤中传输距离达20 km,功率代价小于2 dB。A radio over fiber （ROF） system to generate optical millimeter wave with four time frequency of the local oscillator frequency using two-cascaded intensity modulators based on optical carrier suppression scheme was investigated numerically and experimentally. In the central office, the upstream data were mixed with the radio frequency （RF） clock to generate a electrical signal, and then an external modulator was used to generate a optical millimeter with double freqnency of RF clock, after the second external modulator, the optical millimeter wave was generated with frequency quadruple. By this scheme, a 40 GHz millimeter wave was generated by the frequency mixing of the 10 GHz signal source and the 2.5 Gbit/s baseband data signal passing through the two external modulator. After transmission over single-mode fiber （SMF） 20 km, the power penality is less than 2 dB.

关 键 词：光通信 光纤无线通信系统 外部调制器 光载毫米波 光载波抑制 下行链路 

分 类 号：TN929.11[电子电信—通信与信息系统]