Highly linear transmission and EVM improvement of vector modulation signals for radio-over-fiber applications  

作　　者：喻佼焱 李尚远 郑小平 张汉一 周炳琨 

机构地区：[1]Tsinghua National Laboratory for Information Science and Technology,Department of Electronic Engineering,Tsinghua University

出　　处：《Chinese Optics Letters》2012年第10期26-28,共3页中国光学快报（英文版）

基　　金：supported by the National "973" Program of China (Nos. 2012CB315603 and 2012CB315604);the National Natural Science Foundation of China (Nos. 60736003, 61025004, and 61032005);the Ph.D. Program Foundation of the Ministry of Education of China (No. 20100002110039);the China Postdoctoral Science Foundation (No. 20110490426)

摘　　要：The principle of error vector magnitude （EVM） against modulator nonlinearity for vector modulation signal （VMS） transmission in radio-over-fiber （RoF） systems is theoretically and experimentally investigated. A highly linear modulation scheme is proposed and demonstrated using a single-drive dual parallel Mach–Zehnder modulator （MZM）. This method improves EVM performance and enlarges the linear input dynamic range of the VMS transmission. An index of maximum allowable input power difference （MAIPD） that reflects the difference of upper input power limits between these two schemes is measured. An EVM limitation of 5% MAIPD has 5 dB. Both 16and 64-QAM results indicate that the proposed scheme supports VMS transmission better than the MZM one.The principle of error vector magnitude （EVM） against modulator nonlinearity for vector modulation signal （VMS） transmission in radio-over-fiber （RoF） systems is theoretically and experimentally investigated. A highly linear modulation scheme is proposed and demonstrated using a single-drive dual parallel Mach–Zehnder modulator （MZM）. This method improves EVM performance and enlarges the linear input dynamic range of the VMS transmission. An index of maximum allowable input power difference （MAIPD） that reflects the difference of upper input power limits between these two schemes is measured. An EVM limitation of 5% MAIPD has 5 dB. Both 16and 64-QAM results indicate that the proposed scheme supports VMS transmission better than the MZM one.

关 键 词：Light modulators MODULATION RADIO over fiber 

分 类 号：TN761[电子电信—电路与系统]