基于长周期光纤光栅载边比连续可调的单边带调制光载无线通信系统  

Optical Single Sideband Modulation Radio over Fiber System with Tunable Carrier-to-Sideband Ratio Based on Long Period Fiber Gratings

作　　者：油海东[1,2] 宁提纲[1] 李晶[1] 简伟[1] 温晓东[1] 陈宏尧[1] 

机构地区：[1]北京交通大学光波技术研究所,北京100044 [2]青岛农业大学理学与信息学院,山东青岛266109

出　　处：《光学学报》2013年第7期43-47,共5页Acta Optica Sinica

基　　金：国家自然科学基金(61177069;61275092)

摘　　要：提出了一种基于长周期光纤光栅(LPFG)载边比(CSR)连续可调的单边带调制光载无线通信(RoF)系统。其核心单元是由偏振控制器(PC)、偏振分束器(PBS)、两个平行的长周期光纤光栅和偏振合束器(PBC)构成的载边比调节单元。通过调节偏振控制器输出的偏振角度,就可以实现载边比的连续可调。进一步分析了调制指数、长周期光纤光栅透射率峰值和马赫-曾德尔调制器消光比对载边比的影响。仿真结果与理论分析结果具有很好的一致性。经40km标准单模光纤(SMF)传输后的仿真实验表明,当载边比由13.22dB调节到5.4dB后,系统灵敏度提高了5.7dB。An optical single sideband modulation radio over fiber （RoF） system with tunable carrier-to-sideband ratio （CSR） based on long period fiber grating （LPFG） is presented. The system mainly consists of five polarization controllers （PC）, a polarization beam splitter （PBS）, two parallelized long period fiber gratings （LPFG）, and a polarization beam combiner （PBC）. By tuning the polarization controller placed in front of the polarization beam splitter, continuously tunable carrier-to-sideband ratio can be obtained. The impacts of modulation index, transmission peak value of LPFG, and extinction ratio of the Mach-Zehnder modulator on CSR are discussed. Simulated results for transmission over 40-km single mode fiber （SMF） show that the receiving sensitivity increases by 5.7 dB when CSR changes from 13.22 dB to 5.4 dB which matches well with theoretical analysis.

关 键 词：光纤光学 光载无线通信 载边比调节 单边带调制 长周期光纤光栅 

分 类 号：TN929.11[电子电信—通信与信息系统]