双音调制星间微波光子链路信号噪声失真比优化  

Optimization of signal-noise distortion ratio for intersatellite microwave photonics link under dual-tone modulation

作　　者：朱子行[1] 赵尚弘[1] 张辉[2] 李勇军[1] 楚兴春[1] 侯睿[1] 王翔[1] 赵顾颢[1] 

机构地区：[1]空军工程大学电讯工程学院,陕西西安710077 [2]空军工程大学科研部,陕西西安710051

出　　处：《红外与激光工程》2013年第2期482-488,共7页Infrared and Laser Engineering

基　　金：国家863计划(2007AA01Z294)

摘　　要：建立了包括光源、马赫曾德尔调制器、掺铒光纤放大器和光电探测器的双音调制星间微波光子链路模型。利用贝塞尔函数展开、傅里叶变换/反变换和Graf加法定理,推导出探测器输出信号的严格通用解析解,考虑三阶交调失真的影响,得出信号噪声失真比(SNDR)的表达式。着重分析了在不同调制方式下SNDR、基波和三阶交调信号功率随射频输入功率的变化情况。数值计算结果表明:SNDR、基波和三阶交调信号功率随射频输入功率的增大先增大后减小,存在最优的射频输入信号功率使SNDR达到最大。相同射频输入功率条件下,双边带调制SNDR大于单边带调制,适合星间微波光子链路应用。A dual-tone modulation inters atellite microwave photonics link model was presented including optical source,Mach-Zehnder modulator,erbium-doped fiber amplifier and photodiode.An exact analytical solution for any harmonic and intermodulation components at the output of the detector was deduced with the method of bessel expansion,fourier transform/inverse fourier transform and graf addition theory,thus,the expression of SNDR was derived considering the effects of third-order intermodulation distortion（IM3）.The SNDR,fundamental and IM3 power varies with the radio frequency（RF） input power under different modulation modes was analyzed.Numerical results indicate that the SNDR, fundamental and IM3 power increases and decreases as the increase of RF input power,there is an optimum RF input power that maximize the SNDR.The SNDR of double sideband modulation is larger than single sideband modulation under the same RF input power and it is suitable for the application of intersatellite microwave photonics link.

关 键 词：微波光子 马赫-曾德尔调制器 双音调制 信号噪声失真比 

分 类 号：TN2[电子电信—物理电子学]