基于色散光学的光波束形成网络

为了实现大波束指向范围和精细步进调节的光波束形成网络,采用了基于光学色散实现光真延时的方法.通过光开关实现N路高色散光纤路径切换获得大步进等延时差,实现了波束指向的大范围和大步进调节;通过调谐线性啁啾光纤光栅色散系数连续调谐获得小步进等延时差,实现了波束指向的小范围和小步进调节.结果表明,波束指向角度范围为-73.74...

An optical beamforming network based on dispersing optics

In order to implement the large beam pointing range and the fine step adjustment of an optical beamforming network(OBFN),a method of optical dispersion-based optical true time delay(OTTD)was adopted.The path switching of N-way high dispersion fiber was realized by the optical switch,and thus the equally large-step delay difference was realized,then the beam pointing with a large range and a stride adjustment was realized.By tuning the dispersion coefficient of the linear chirped fiber Bragg grating(LCFBG),the equally small-step delay difference was realized,and then beam pointing with a small range and a small-step adjustment was realized.The theoretical analysis and simulation verification of the above method were carried out,and a beam pointing angle range of-73.74°~+73.74°and a switching step of 0.458°was obtained.The result shows that the large beam pointing range and the fine step adjustment of the OBFN were realized based on optical dispersion,which is helpful to improve the system designing of phased-array antenna.