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2.5 Gbit/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20 GHz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 mm-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.