论文部分内容阅读
利用单边带调制技术,设计了一种改进的毫米波光纤传输系统,进行了系统色散分析及仿真实验。该系统在中心站通过设置相位调制器的偏置电压,使调制器产生的奇数边带被抑制,采用滤波器滤出其中的一个二阶边带。基带信号经过中频调制形成副载波,再将此副载波通过单边带调制到二阶边带上;在基站,通过带通滤波器滤出上行链路所需的光载波。用该单边带调制技术产生的光载毫米波可以传输100km。理论分析和仿真结果表明,该系统能简化中心站和基站的配置,有效地降低系统的光纤色散,节省频带资源。
Using single sideband modulation technology, an improved millimeter wave optical fiber transmission system is designed and the system dispersion analysis and simulation experiments are carried out. The system at the central station by setting the phase modulator bias voltage, so that the odd sideband modulator is suppressed, the filter out of which a second-order sideband. The baseband signal is modulated by the intermediate frequency to form a subcarrier, and then the subcarrier is modulated onto the second-order sideband through a single sideband; at the base station, the optical carrier required by the uplink is filtered out by a band-pass filter. The optical millimeter wave generated by this single sideband modulation technique can transmit 100 km. Theoretical analysis and simulation results show that the system can simplify the configuration of central station and base station, effectively reduce the optical fiber dispersion and save the bandwidth resources.