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提出了一种基于双边带(DSB)部分载波抑制调制(OCS)方式的微波光纤传输(ROF)系统结构,实现了矢量信号的传输以及调制方式由8PSK到QPSK的转换,并使用光纤Bragg光栅(FBG)实现了光载波的重新使用,降低了系统的成本。分析了实验原理并搭建了实验链路,在中心站,采用光OCS方案产生并倍频加载了携带有1 Mbps的8PSK矢量信号的5 GHz微波信号,实验结果表明,在基站,使用FBG实现光载波重用的同时,微波信号频率由5 GHz上转换为10 GHz,传输的矢量信号调制方式由8PSK变为QPSK。通过光谱可以看出,实验链路成功实现了50 GHz nm波矢量信号的产生和传输。
A structure of microwave optical fiber transmission (ROF) system based on double-sideband (DSB) partial carrier suppression modulation (OCS) is proposed. The transmission of the vector signal and the conversion of the modulation mode from 8PSK to QPSK are realized. The optical fiber Bragg grating FBG) to achieve the re-use of optical carrier, reducing the cost of the system. The experimental principle is analyzed and an experimental link is set up. At the central station, a 5 GHz microwave signal carrying a 1 Mbps 8PSK vector signal is generated and multiplied by the optical OCS scheme. The experimental results show that at the base station, FBG is used to implement light At the same time of carrier reusing, the frequency of the microwave signal is converted from 5 GHz to 10 GHz, and the modulation mode of the transmitted vector signal is changed from 8PSK to QPSK. It can be seen from the spectrum that the experimental link has succeeded in generating and transmitting a 50 GHz nm wave vector signal.