建立了传输距离为150 km的40 Gbit/s 4QAM-OFDM单模光纤传输模型,并进行了仿真分析.通过光外差法产生60 GHz的毫米波信号,在接收端采用相关解调的方式接收信号.用Matlab和VPI联合编程仿真,采用DCF和信道估计的方法对色散进行补偿,通过对解调后星座图、色散性能、Q值和误码率的分析,在输入功率为10 dBm时可以得到最好的结果,仿真测试结果清晰地表明了4QAM-OFDM系统在150 km的光纤链路中传输的可行性.%A 4QAM-OFDM single mode optical fiber transmission model with 150 km of transmission distance and 40 Gbit/s of transmission rate was established.Simulation analysis was held with this system.The millimeter-wave signals of 60 GHz through optical heterodyne technique were received by coherent demodulation at the receiving end.The joint programming simulations were made by Matlab and VPI.Chromatic dispersions were compensated by DCF and channel estimation.By analyzing signal constellations, dispersion characteristics,Q value and bit error rate after demodulation,the best result appeared when the input power was 10 dBm.The outcome of simulation test explicitly explained the feasibility of the 4QAM-OFDM system of transmitting signals in 150 km optical fiber link.
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