【摘要】 利用Tb0.3Dy0.7Fe1.95的磁致伸缩特性调谐线性啁啾光纤光栅延迟线,将中心反射波长1550nm,啁啾系数2.58nm/cm,长度60mm,3dB带宽15.48nm的线性啁啾光纤光栅两端牢固地粘在长度为70mm、直径为8mm的磁致伸缩棒上,并置于一个均匀线圈磁场中,当线圈电流从0A增加到2A时,粘在磁致伸缩棒上的线性啁啾光纤光栅受到轴向应变,反射谱向长波长方向平移了1.6nm,实现最大60ps的时延调谐量,这种装置可以使阵元间隔为0.006m的四阵元光控相控阵雷达系统工作在25GHz时,实现0°～90°的扫描。更多还原

【Abstract】 By using magnetostrictive characteristics of Tb0.3Dy0.7Fe1.95 to tune the time-delay line of linear chirped fiber grating (CFG), the ends of linear CFG are pasted firmly to the magnetostrictive rod with length of 70 mm and diameter of 8 mm. The center wavelength of the grating is 1 550 nm, the FWHM bandwidth is 15.48 nm and its length is 60 mm. The magnetostrictive rod is laid into a uniform magnetic field of coil. When the current in the solenoid changes from 0 A to 2 A, the grating gets a axial strain and the spectrum shifts about 1.6 nm to the longer wavelength, consequently, the maximum time-delay change, 60 ps, is achieved. The setup can make a four-elements optical-controlled phased array antenna with the element spacing of 0.006 m realize the scanning angles from 0° to 90°.更多还原