摘要
设计了包括两只作为准直、聚焦元件的波导短程透镜和两级布拉格声光移频结构的单片集成声光芯片。数值计算了优化理想波导短程透镜的母线函数数值和声光器件的几何参数。在x、y、z方向尺寸分别为46 mm、2.5 mm3、0 mm的Ti扩散LiNbO3光波导基片上制作了光纤耦合结构的声光移频芯片。测试短程透镜传输损耗为1.2 dB,衍射光斑半功率点宽度为4.5μm;与单模光纤的耦合插入损耗小于20 dB;芯片驱动的中心频率为110 MHz;可实现3 dB调制带宽为±10 MHz.
Acousto-optic（AO） frequency shifter that consists of a pair of geodesic waveguide lenses for collimating and focusing and a pair of cascade waveguide AO Bragg cells was realized in a Ti diffused y cut LiNbO3 waveguide substrate with 46 mm × 2.5 mm × 30 mm in size. Optimized ideal waveguide geodesic lens profile and AO parameters were numerically calculated and designed. Transmission loss of 1.2 dB and diffracted facula＇ s full width at half maximum （FWHM） of 4.5 μm were measured for geodesic lens. All the chips have 3 dB modulation bandwidth of 10 MHz and coupling insertion loss of 20 dB with single-mode optical fiber at driving baseband frequency of 110 MHz.
出处
《兵工学报》
EI
CAS
CSCD
北大核心
2008年第12期1432-1436,共5页
Acta Armamentarii
关键词
光学
光波导
声光移频
短程透镜
布拉格衍射
optics
optical waveguide
acousto-optic frequency shifter
geodesic lens
Bragg diffraction
