基于多频相位调制的光学单边带调制器研究  

Numerical research on optical single sideband modulator generated by multi-frequency phase modulation

作　　者：朱学华 代广珍 王正刚 王冠凌 宋晓庆 ZHU Xue-hua;DAI Guang-zhen;WANG Zheng-gang;WANG Guan-ling;SONG Xiao-qing(College of Electrical Engineering,Anhui Polytechnic University,Wuhu 241000,China)

机构地区：[1]安徽工程大学电气工程学院,芜湖241000

出　　处：《光电子．激光》2018年第11期1173-1178,共6页Journal of Optoelectronics·Laser

基　　金：安徽高校自然科学研究重点项目(KJ2017A124);安徽工程大学检测技术与节能装置省重点实验室开放基金(2017070503B026-A08;1506C085002);安徽工程大学引进人才科研启动基金(2016YQQ016)资助项目

摘　　要：提出了一种基于多频相位调制技术实现光学单边带调制信号产生的新型方案。当含有基频和谐波成分的多频调制信号施加到Mach-Zehnder(MZ)电光调制器上时,若驱动信号波形选取合适,可使调制后的光信号功率集中在边带谱的一个频率成分上,其它频率成分被抑制,从而获得光学单边带调制信号的输出。以十频相位调制为例,计算了与之对应的光学单边带调制信号的光谱结构,其中信号能量利用率近88%,载波抑制比大于24dB,边频抑制比大于18dB,从理论上证明了本文所述方案的可行性。进一步的仿真结果显示,随着驱动信号谐波数的增加,载波抑制比、边频抑制比和信号能量利用率均逐渐增大。可见,为了获得优质的光学单边带调制信号,应在实际条件允许的情况下使用尽可能多的调制频率。此方案能量利用率相对较高,仅用到了一级商用MZ相位调制器,方案结构简单,是一种产生光学单边带调制信号的有效途径。In this paper, a novel scheme for optical single side-hand signal generation based on multi-fre- quency modulation is proposed. When a modulation signal containing fundamental frequency and harmon- ic waves was loaded onto a Mach-Zehnder electro-optic modulator,most of the optical power would concentrate on one sideband, while other frequency components were suppressed, and made a single sideband signal. As an example, the signal spectrum generated by 10-tones phase modulation was numerically cal- culated. Energy efficiency up to 88 %, carrier suppression ratio of 24 dB and sideband suppression ratio of 18 dB were obtained in our simulation, which indicates that the proposed scheme is feasible and efficient. Further simulation results show that the energy efficiency, carrier suppression ratio and the sideband suppression ratio all rise with the increase of the number of harmonic waves. Thus it can be seen that to get optical single sideband signal with high quility, as many modulation frequencies as possible should be used if the experiment condition satisfied. Commercial Mach-Zehnder electro-optic mudulator and RF driver were used in our scheme, which makes the virtue of high energy efficiency and simple configura- tion for operation. It provides an effective way to generate an OSSB signal for optical communication or optical sensing systems.

关 键 词：单边带调制信号 相位调制 多频调制 Mach-Zehnder调制器 光纤通信 光纤传感 

分 类 号：O439[机械工程—光学工程] TN929.11[理学—光学]