CAJ | 학술논문

为克服远距离光纤传输系统中色散效应的影响，研究了一种基于光载波抑制的单工 ROF(光纤无线电)系统，并提出改进的双工 ROF系统传输方案。在中心站，采用20 GHz的射频信号将下行链路信号耦合至光载波抑制频段处，通过单模光纤传输50 km至基站，并重复利用未调制边带传输上行链路信号。通过仿真得到的系统光谱图和误码率曲线表明：加入上行链路信号传输后，下行链路的光纤能量损耗降低，上、下行链路同时具有较好的抗色散能力。
위극복원거리광섬전수계통중색산효응적영향，연구료일충기우광재파억제적단공 ROF(광섬무선전)계통，병제출개진적쌍공 ROF계통전수방안。재중심참，채용20 GHz적사빈신호장하행련로신호우합지광재파억제빈단처，통과단모광섬전수50 km지기참，병중복이용미조제변대전수상행련로신호。통과방진득도적계통광보도화오마솔곡선표명：가입상행련로신호전수후，하행련로적광섬능량손모강저，상、하행련로동시구유교호적항색산능력。
In order to overcome the influence of dispersion in long-range fiber-optic transmission systems,we study a simplex Radio-Over-Fiber (ROF)system based on optical carrier suppression and propose an improved duplex ROF system transmis-sion scheme,in which the down-link signals are coupled to the optical carrier suppression band using 20 GHz RF signals at the central station and then transmitted to the base stations over a 50 km single-mode fiber,while the unmodulated sideband is re-used to transmit the uplink signals.The system spectrum diagram and BER curve generated in simulation show that when transmitted by coupling with uplink signals,the energy penalty of downlink signal is decreased and both the uplink and down-link become more dispersion resistant.