论文部分内容阅读
实验研究了一种采用单个光载波和一个单臂LiNdO3调制器同时产生多个不同频率光毫米波的光无线通信(ROF)系统。在中心站,多路不同频率的射频(RF)信号与相应的基带数据信号进行混频,再用功率耦合器将它们耦合成一路信号,输出信号用于驱动单臂LiNdO3调制器进行载波抑制调制去产生多频率的光毫米波信号。经过光纤传输后,在基站,利用光滤波器将载有不同频率光毫米波的光频成分进行分离,之后再分别进入光电检测器(O/E)进行检测。实验结果显示,采用频率为10 GHz与20 GHz的RF信号源可以产生频率为20GHz与40 GHz的光毫米波,20 GHz的毫米波携带2.5 Gb/s的下行基带数据信号在单模光纤中可以传输40km以上,因此这种方案是有效和可行的。
An optical wireless communication (ROF) system using a single optical carrier and a single-arm LiNdO3 modulator to simultaneously generate multiple millimeter-waves of different frequencies is experimentally studied. At the central station, multiple radio frequency (RF) signals of different frequencies are mixed with corresponding baseband data signals and then coupled into one signal by a power coupler. The output signal is used to drive a single-arm LiNdO3 modulator for carrier suppression modulation To produce multi-frequency optical millimeter wave signal. After optical fiber transmission, at the base station, the optical frequency components containing different millimeter waves of light at different frequencies are separated by an optical filter, and then are separately entered into a photodetector (O / E) for detection. The experimental results show that the use of RF signal sources at 10 GHz and 20 GHz produces optical millimeter waves at 20 GHz and 40 GHz, while 20 GHz millimeter waves carry 2.5 Gb / s downlink baseband data signals in single-mode optical fibers Transmission over 40km, so this program is effective and feasible.