可变透镜边沿模拟顶角可调棱镜的可变光衰减器

A Variable Optical Attenuator Based on Liquid Optical Wedge

设计并制作了一种集成可变透镜的可变光衰减器．该器件以具有圆柱状通孔的精密套管为透镜腔，套管两端的侧壁上分别连接输入／输出光纤准直器．准直器的光轴穿过可变透镜边沿而非中心，可变透镜边沿模拟顶角可调棱镜，形成“输入准直器＋可调液体棱镜＋输出准直器”的结构．通过电湿效应形成顶角可调的棱镜效应，使输入光纤准直器发出的光偏离输出光纤准直器最佳接收位置，进而实现光纤准直器耦合光强的调控，达到光的衰减控制目的．实验结果表明，该光衰减器的衰减范围达到2～53dB，可用于光通信实验的演示和学生实验等场合．

A novel variable optical attenuator device of based of variable-focus liquid lens was proposed and fabricated, of which basic structure included a cylindrical precisiontube as the lens chamber and its side wall sandwiched between two collimators. Liquid lens approximated as optical wedge to form structure of ＂input collimator＋adjustable lens prism＋output collimator＂, the optical axis of the collimator run through the edge of the variable lens. The light emitted by the input fiber collimator deviated from the output fiber collimator best receiver position, through liquid lens electrowetting on dielectric analoging prism, to realize the fiber collimators coupling lightintensity and control optical attenuation. The experimental results show that the range of attenuation values of variable optical attenuato rise up to 2 ~ 53 dB, and can be used for demonstration of optical communication experiment, experimental teaching or other occasions.