一种多波段信号输出的全双工光载无线系统

Full-duplex radio-over-fiber system with multi-band signal output

为了提升通信系统的灵活性,扩大应用范围,同时降低建设成本,提出一种多波段信号输出的全双工光载无线系统。在单光源条件下,通过灵活控制偏振控制器、线性偏振器的角度,实现3路不同频段的下行矢量信号传输;利用载波重用和相干检测技术,实现上行基带信号输出。仿真结果表明:6 Gb/s四进制正交幅度调制(16QAM)信号经30 km光纤传输后,下行链路中5 GHz、45 GHz和25 GHz频段输出信号的最小误差矢量幅度(EVM)分别为5.66%、4.03%和2.67%,上行链路输出信号的最小EVM为4.01%。

In order to improve the flexibility of the communication system,expand the application range and reduce the construction cost,a full-duplex radio-over-fiber system with multi-band signal output is proposed in this paper.Under the condition of single light source,this paper realizes the downlink vector signal transmission in three different frequency bands by flexibly controlling the angle of polarization controller and linear polarizer.Using carrier reuse and coherence detection technology,uplink baseband signal output is realized.The simulation results show that for the 6 Gb/s hexadecimal quadrature amplitude modulation(16QAM) signals are transmitted through 30 km optical fiber,the minimum error vector amplitude(EVM) of the output signals in 5 GHz,45 GHz and 25 GHz bands in the downlink are 5.66%,4.03% and 2.67%,respectively.The minimum EVM of the uplink output signal is 4.01%.