摘要
自适应光纤准直器（AFOC）是一种快速、高精度调节出射准直激光束方向的新型无源光纤器件。随着其应用范围的拓展，对AFOC的谐振特性提出了更高的要求。对阶梯型减振结构改善AFOC谐振特性的方法进行了实验研究，结果表明该结构能提高AFOC的一阶谐振频率并减小谐振峰谷值。在此基础上，理论并实验研究了利用双二阶数字滤波器技术提高AFOC可用带宽的方法，实验结果表明，该方法有效地抵消了一阶谐振峰，将AFOC的可用带宽从约1．3kHz提升至2．5kHz。
The adaptive fiber-optics collimator （AFOC） is a kind of passive fiber-optics device with the capability of fast and precise tip-tilt deviation control of collimated output. With the rapid extension of its application areas, the AFOC with greater resonance characteristic is needed. A method of using step-profile damping structure to improve the resonance characteristic of AFOC is experimentally studied, and the results reveal that the first-order resonance frequency increases with the reduction of the first-order resonance peak. On this basis, a way to enhance the available bandwidth of AFOC is studied theoretically and experimentally based on the biquad digital filter technique. Experimental results show that the first-order resonance peak of AFOC is suppressed efficiently and the usable operation bandwidth increases from about 1.3 kHz to 2.5 kHz.
出处
《光学学报》
EI
CAS
CSCD
北大核心
2014年第13期99-104,共6页
Acta Optica Sinica
基金
国家自然科学基金（61205069,61138007）
关键词
光纤光学
自适应光学
自适应光纤准直器
谐振特性
双二阶数字滤波器
fiber optics
adaptive optics
adaptive fiber-optics collimator
resonance characteristic
biquad digitalfilter
