通过光电相位调制和光纤光栅滤波实现Radio over Fiber传输系统设计  

A BI-DIRECTIONAL RADIO-OVER-FIBER SYSTEM BASED ON ELECTRONICALLY OPTICAL PHASE MODULATION AND FIBER BRAGG GATING

作　　者：李广[1,2] 黄旭光[1] 杨旭生[1] 

机构地区：[1]华南师范大学光子信息技术广东省高校重点实验室,广东广州510631 [2]珠海银邮光电技术发展股份有限公司,广东珠海519000

出　　处：《华南师范大学学报（自然科学版）》2011年第4期67-70,共4页Journal of South China Normal University(Natural Science Edition)

基　　金：国家自然科学基金项目(61077038)

摘　　要：提出并模拟证明了基于电光相位调制(PM)和布拉格光纤光栅(FBG)实现受抑光载波的双边带(DSBOCS,Double-Sideband with Optical Carrier Suppression)的双向Radio over Fiber(RoF)传输系统网络设计方案.激光光源置于中心站,载有信息的光信号通过光纤到达基站后经FBG分成两路,其中一路是被接收的下行信号,另一路作为上行信号调制后返回中心站.通过FBG,其下行信号不但实现了受抑光载波的双边带———使通信带宽加倍,上行信号作为光源通过电光强度调制,有效地实现信息的上载.仿真结果表明,光源发射功率为3 dBm,无光放大,在色散系数为20 ps/(nm.km),衰减系数为0.25 dB/km的单模光纤中传输,超高频RF信号的频率可达24 GHz,系统码元传输速率可达2.5 Gbit/s、传输距离50 km以上.A system scheme of generating and transmitting base-band and RF signal is simulated and demonstrated,based on double-sideband with optical carrier suppression scheme to generate optical millimeter-wave signal via electronical-optical phase modulation（EO-PM） and FBG.The network architecture with centralized light source stands at the central station.There exist two ways for signals from the base station through FBG after the signals arrive it.One is upstream remodulated then back to the central station,another is downstream with wavelength received at the base station.The data remodulation using downstream wavelength received at a base station is an attractive solution for low-cost implementation of the upstream transmitter since it requires no light source and wavelength management at the base station.The downlink communicated bandwidth can be doubled to realize Ultra Width Band Ultra High Frequency（UHF） communication via phase modulation and FBG at the base station.The other signal which is from FBG can be as uplink via amplitude modulation availably.The simulation results show that the bi-directional 2.5 Gbit/s data and UHF microwave with 24 GHz is successfully transmitted over 50 km distance of a single-mode fiber with a dispersion of 20 ps/（nm·km）,an attenuation of 0.25 dB/km and a light source power of 3 dBm.

关 键 词：电光相位调制 FBG 受抑光载波的双边带 光学毫米波 ROF 光纤通信系统 无线通信网络 

分 类 号：TN929.11[电子电信—通信与信息系统]