基于微波光子的射频信号功率测试方法

RF Signal Power Measurement Based on Microwave Photonics

功率是微波信号的基本参数之一。传统的功率测量方法受限于同轴电缆传输损耗大、体积大等因素,难以适应分布式长距离组网应用。文章提出基于电光转换的微波功率测量方法,将微波功率测量转换为对光边带抑制比的测量。分别分析了采用相位调制和强度调制的电光转换方法时,微波功率与光边带抑制比之间的映射关系。实测对比了测量值与理论计算值之间的符合性。该方法经过电光转换后,可以采用光纤传输信号,进行长距离远拉测试,在分布式长距离组网中具有较好的应用前景。

Power is one of the basic parameters of microwave signal.Traditional power measurement methods are difficult to adapt to distributed long-distance network applications due to high transmission loss and large volume of coaxial cables.In this paper,a method of microwave power measurement based on electro-optic conversion is proposed.The microwave power measurement was converted to the measurement of optical sideband rejection ratio.The mapping relationship between microwave power and optical sideband rejection ratio was analyzed respectively for electro-optic conversion methods using phase modulation and intensity modulation.Finally,the compliance between the measured value and the theoretical value was compared.After electro-optic conversion,this method can use optical fiber to transmit signals and carry out long-distance testing,which has a great application prospect in distributed longdistance networking.