一种基于OPM和FBG滤波器的新型双工ROF系统

提出了一种采用光相位调制器(OPM)和光纤布 拉格光栅(FBG)滤波器实现的双向光纤无线通信(ROF)系统。在中心站,系统采用OPM和FBG滤波器产生抑制一阶边带的多边带光信号 ,而2.5Gbit/s 的下行链路信号只调制在中心光载波上同时经过光纤进行传输。在基站,未被调制的边带信 号用来重新调 制上行链路信号。建立了产生光载毫米波的理论模型,分析了光纤色散导致的相位影响,并 通过仿真实验 验证了系统的可行性。结果显示,经过60km光纤传输后,上、下行 链路信号的眼图都清晰可见,上行链 路功率代价小于0.2dB,下行链路功率代价小于1.8dB,系统具有较好的抗色散能力。

A novel full-duplex ROF system based on OPM and FBG filter

A novel full-duplex radio-over-fiber (ROF) system based on optical phase modulator(OPM)and fiber Bragg grating (FBG) filter is proposed and analyzed theoretically.In the center sta tion,double sideband with the suppressed first-order sidebands optical millime ter (mm) wave signal are generated utilizing pha se modulator along with FBG filter,while 2.5Gbit/s downlink signal is modulated only onto central optical carrier sign al and transported along the optical fiber.In the base station,the unmodulated sideband is reused to transmit the uplink signal. The paper sets a theoretical model about optical mm-wave generation and analyzes fiber dispersion influence on phase,an d proves the feasibility of the system through the simulation test.The results show that both the upstream signal and the downstream signal are visible in eye diagrams after 60km fiber transmission.The power penalty of the upstream signal is less than 0.2dB and the power penalty of the downstream signal is less than 1.8dB.The system possesses better anti-dispersion performance.