循环频移方法中射频信号的相位偏移对多载波稳定性及平坦度的影响(英文)  

Effects of RF Signal Phase Deviation on Generation of Stable and Flat Multi-carrier Based on Recirculating Frequency Shifter

作　　者：周骥[1] 李瑗洁 刘祖锋[1] 乔耀军[1] 纪越峰[1] 

机构地区：[1]北京邮电大学信息与通信工程学院信息光子学与光通信国家重点实验室,北京100876

出　　处：《光子学报》2014年第7期79-83,共5页Acta Photonica Sinica

基　　金：The National Natural Science Foundation of China(Nos.61271192,60932004);the National Hi-Tech R&D Program of China(No.2013AA013401)

摘　　要：为了得到高性能的多载波光源,研究了射频信号中不同相位差对光多载波的影响.通过理论分析可得,随着相位差从90°降至0°,光多载波性能会逐渐变差,但是相位差偏与90°相差不大时,性能不会下降太多.实验中通过移相器改变相位差,使相位差为90°,45°,0°,得到循环前IQ调制器的输出光谱,并对比循环后光多载波性能.实验结果显示,相位差为90°时,循环前IQ调制器输出为较好的单边带光谱,循环后输出50条平坦稳定光多载波;相位差为45°时,光多载波质量变差;相位差为0°时,得不到光多载波.因此,射频信号相位差为90°时,光多载波的性能最佳,随着相位差变小,性能下降,但是相位差为45°时,产生的光多载波仍可应用于光通信.In order to generate a high quality multi-carrier,the phenomenon caused by different phase deviation of radio frequency was analysed.In this paper,the theoretical analysis revealed that the quality of multi-carrier would deteriorate gradually when the phase deviation decreases from 90°to 0°.But when phase deviation is slightly different from 90°,the quality of multi-carrier is good enough for the application of optical communication.In the experiment,the qualities of multi-carriers with phase deviation of 90°,45°and 0°were compared.The best performance is obtained at 90°.Under the 45°phase deviation,fifty carriers can also be otainted,but the quality decreases slightly that is good enough to apply to optical communication.And a multi-carrier under 0°phase deviation cannot be obtained.

关 键 词：光通信 多载波 循环移频 相偏 稳定平坦 

分 类 号：TN943.6[电子电信—信号与信息处理]