基于色散光纤棱镜的光控多波束接收技术研究

Research into Optical-controlled Multi-beam Receiving Technology Based on Dispersive Optical Fiber Prism

相比于基于改变光纤物理长度的光真延时波束形成技术,基于色散光纤棱镜的光真延时波束形成技术具有延时精度高、光纤长度控制精度要求低、同时多波束结构相对简单、工程性好等特点。但随着光纤色散系数的增大,色散系数随波长的变化即色散斜率也越来越大,选用等波长间隔的激光器已无法实现波束形成。通过分析色散光纤色散斜率对光波束形成的影响,为激光器阵列波长的选择提供了依据。同时,通过理论分析和实验验证,证明了基于色散光纤棱镜的光控多波束接收技术具有良好的温度环境稳定性。

Compared with the optical true time-delay beam-forming technology based on changing the physical length of optical fiber,the optical true time-delay beam-forming technology based on dispersive optical fiber prism has high delay accuracy,low optical fiber length control accuracy and a relatively simple multi-beam structure&good engineering performance.But with the increase of the fiber dispersion coefficient,the dispersion coefficient changes with the wavelength,i.e.the dispersion slope increases accordingly,and the employment of multiple laser generators with equal wavelength intervals cannot achieve beam-forming mission.This paper analyzes the influence of dispersion slope of the dispersive fiber on optical beam-forming and provides a basis for the selection of the laser generator array wavelength.Besides,through theoretical analysis and experimental verification,it is proved that the optic-controlled multi-beam receiving technology based on the dispersive optical fiber prism has good temperature environment stability.