新型四倍频光生毫米波矢量信号调制技术  

Vector Signal Modulation Technique Based on a Novel Frequency Quadrupling Scheme in Millimeter-Wave Band

作　　者：王勇[1] 李明安[1] 赵强[1] 文爱军[1] 王方艳[1] 尚磊[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《光学学报》2012年第9期21-26,共6页Acta Optica Sinica

基　　金：国家973计划(2010CB328303)资助课题

摘　　要：提出一种基于双并联马赫-曾德尔调制器(MZM)的新型四倍频光生毫米波技术,并用于矢量信号调制。传统的四倍频调制技术,由于数据信号同时调制到+2,-2阶边带上,拍频检测后两个边带上数据信号会产生相位叠加,只适用于不归零码(NRZ)等强度调制格式。提出的矢量信号调制技术将数据信号调制在一个-1阶边带上,另一个+3阶边带不携带数据,在拍频检测后幅度和相位信息被正确保留。同时,四倍频模块降低了传输过程中对电和光器件的带宽需求。理论分析和仿真结果表明,通过此方法产生的携带在60GHz载波上的6.25×108 symbol/s的四相相移键控(QPSK)信号,经过20km单模光纤传输后,误差向量幅度(EVM)损耗可以忽略。A novel frequency quadrupling scheme based on a dual parallel Mach-Zehnder modulator （MZM） for the generation of optical millimeter signal and modulation of the vector signal is demonstrated. The traditional frequency quadrupling modulation scheme, which modulates data on both _u2 and --2 order optical sidebands and will cause the constellation overlapping after photodetector （PD） detection, can only carry the on-off keying data format such as not return to zero （NRZ）. The proposed scheme encodes the electrical vector signal on the --1 order optical sideband, and a pure radio frequency （RF） tone at ＋3 order optical sideband. Therefore, phase and amplitude information will be correctly preserved after detection. Besides, a frequency quadrupling scheme is employed to reduce the bandwidth requirements of the electrical and optical components of the transmitter. A proof of concept and simulation is conducted by using a 6.25 × 108 symbol/s QPSK signal at a carrier frequency of 60 GHz , which indicates that the error vector magnitude （EVM） penalty is negligible after transmission over 20-km single-mode fiber （SMF）.

关 键 词：光通信 光载射频通信 光生毫米波 马赫-曾德尔调制器 矢量信号调制 

分 类 号：TN929.11[电子电信—通信与信息系统]