微波光链路的噪声系数分析  

Analysis of Noise Figure for Microwave Photonic Links

作　　者：金丽丽[1,2] 陈福深[1] 陈吉欣[2] 

机构地区：[1]电子科技大学通信与信息工程学院,四川成都610054 [2]信息综合控制国家重点实验室,四川成都610036

出　　处：《激光与光电子学进展》2009年第11期92-96,共5页Laser & Optoelectronics Progress

基　　金：国防预研基金(YG0602)资助课题

摘　　要：微波光链路(MPL)是利用光纤传输微波信号,与传统的射频链路相比具有带宽大、损耗小、质量轻、抗电磁干扰等优势,但也存在噪声系数较大的问题,从而影响链路的动态范围。建立了直接调制的微波光链路模型,在不考虑频响的情况下推导出链路固有增益和噪声系数的表达式,研究了激光器的转换效率、光纤的损耗和相对强度噪声(RIN)对链路噪声系数的影响。还建立了链路频响的模型,推导出固有增益与频率关系的表达式,分析仿真了频率对链路固有增益和噪声系数的影响,并与实验结果进行了比较。Compared with the conventional microwave links, microwave photonic links （MPL） can provide much wider bandwidth, lower loss, reduced weight and susceptibility to electromagnetic interference in the propagation of microwave signal by optical fiber. However MPL is generally limited by high noise figure, which affects the dynamic range of system. A model about directly modulated MPL is built, and the expression about noise figure of ignoring frequency dependence is deduced. The relationship between noise figure and modulation efficiency, the loss of the fiber, as well as RIN is simulated. The frequency response model of the link is also built, and then the effects of frequency on the intrinsic gain and noise figure of MPL are investigated and compared with the result of experiments.

关 键 词：微波光子学 微波光链路 固有增益 噪声系数 相对强度噪声 

分 类 号：TN929.1[电子电信—通信与信息系统]