一种基于相干检测的双向输出信号频率可选的光纤无线系统

提出了一种单光源、双向输出信号频率可选的光纤无线系统,该系统在单光源条件下,利用相干检测技术、数字信号处理技术,结合并行相位调制器以及波长选择开关结构,在上下行链路实现基带信号、多个毫米波信号输出.仿真验证表明,针对20Gbit/s 16-QAM调制信号,经30km光纤传输,系统下行输出信号频率实现0~60GHz可选,其传输最小矢量误差为6.53%(0GHz)~7.61%(60GHz);上行输出信号频率实现0~120GHz可选,其传输最小矢量误差为6.89%(0GHz)~8.30%(120GHz).理论分析和仿真结果表明,该系统双向链路均可实现频率可选的信号输出,且双向传输具有较好的性能表现.

Output Signal Frequency Optional Full-duplex Radio over Fiber System Based on Coherent Detection

A bidirectional output signal frequency optional radio over fiber system based on coherent detection and digital signal processing technology is presented.The proposed system uses parallel phase modulator and wavelength selector switch structure.In the single source condition,the system realizes the baseband signal or multiple millimeter wave signal outputs for both the down and upstream transmissions.The simulation results prove that for the 20 Gbit/s 16-QAM modulated signal,through30 km optical fiber transmission,the system output signal frequency of downlink can be selected from 0~60 GHz,and its transmission minimum error vector magnitude is 6.53%(0 GHz)~7.61%(60 GHz);the system output signal frequency of uplink can be selected from 0~120 GHz,and its transmission minimum error vector magnitude is 6.89%(0 GHz)~8.30%(120 GHz).The theoretical analysis and simulation results show that the full-duplex link can realize alternative frequency output,and maintains good performance.