基于光纤光栅的实时延时技术

True Time Delay Line Based on Optical Fiber Bragg Grating

光实时延时技术与相控阵技术的融合,解决了传统相控阵雷达的瞬时大带宽受限和波束偏斜问题。文中给出了光实时延时技术的思想,讨论了光实时延时技术出现的背景。分析了应用于光实时延时技术中的光纤光栅的原理,着重讨论了均匀光纤光栅和线性啁啾光栅,分别给出了基于两种光纤光栅的光实时延时的技术方案,在此基础上,讨论了受控于应变和温度的光纤光栅在光实时延时技术中的应用。最后讨论了一些技术上存在的问题。

Optical true time delay technology （OTTD） is the key technology for phase array antennas（PAA）. By using OTTD, the beam squint and the restriction of instantaneous bandwidth are resolved. The principles of OTTD are given, the emergence background of OTTD is discussed. The theory of fiber Bragg grating（FBG） used in OTTD is analyzed, especially on uniform fiber bragg grating and linear chirped fiber Bragg grating. Two OTTD schemes based on FBG is presented, then some new kinds of FBG used in OTTD are discussed. Some technique hurdles are analyzed as well.