一种新型的单边带调制技术  

Performance of a Novel Scheme to Generate Single-Sideband Millimeter-Wave Signals

作　　者：雷小燕[1] 董泽[1] 皮雅稚[1] 陈林[1] 余建军[1] 文双春[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

出　　处：《中国激光》2009年第4期889-894,共6页Chinese Journal of Lasers

基　　金：国家863计划(2007AA01Z263);湖南省自然科学基金(06JJ50108);教育部光通信和光波技术重点实验室(北京邮电大学)开放基金资助

摘　　要：从理论和实验两方面研究了一种新型单边带调制(SSB)技术,通过在中心站合适设置单臂强度调制器的偏置电压,使调制器产生的奇数边带被抑制,采用滤波器滤除其中的一个二阶边带,即可产生单边带信号。用该新型的单边带调制技术产生的光毫米波理论上可以传输148 km。同时搭建了实验系统,采用10 GHz的本振信号源与2.5Gbit/s的数字信号混频后驱动单臂强度调制器产生抑制奇数边带的调制信号,再通过一个滤波器得到20GHz的单边带毫米波,还得到了不同载波边带比(CSR)情况下的毫米波眼图。通过实验分析不同载波边带比对传输性能的影响,发现载波边带比为0 dB时,传输性能最佳。A novel scheme to generate optical millimeter-wave （mm-wave） signals by using single-sideband （SSB） modulation technique was proposed and experimentally demonstrated. Odd order sidebands were suppressed by proper adjusting the direct current （DC） bias of signal-arm intensity external modulator in central station. One of the second order sidebands was filtered out and SSB modulation was realized. The ram-wave generated by SSB modulation can be transmitted over 148 km in theory. In experiment, a 2.5 Gbit/s data and an 10 GHz RF clock were mixed. The mixed signals were applied to drive a single-arm intensity modulator to generate 40 GHz double sideband signals. Then a filter is used to get a 20 GHz SSB signal. The effect of optical carrier-to-sideband ratio （CSR） on downstream transmission in radio-over-fiber （ROF） system was analyzed and the performance of the ROF system can be significantly improved when CSR is 0 dB.

关 键 词：光纤光学 光纤无线通信 载波边带比 单边带调制 光毫米波 

分 类 号：TN929.9[电子电信—通信与信息系统]