微流控双稳振荡器光开关  

Optical Switch Based on Microfluidic Bistable Oscillator

作　　者：吴雯婷[1] 梁忠诚[1] 仉乐[1] 赵瑞[1] 孔梅梅[1] 

机构地区：[1]南京邮电大学光电工程学院微流控光学技术研究中心,南京210023

出　　处：《光子学报》2016年第7期176-181,共6页Acta Photonica Sinica

基　　金：江苏省光通信工程技术研究中心项目(No.ZSF0402);江苏省普通高校研究生科研创新计划项目(No.CXZZ13_0465)资助~~

摘　　要：针对光开关集成化、微型化、低能耗的要求,设计了一种微流控双稳振荡器1×2型光开关,其两个输出端口的插入损耗分别为1.03dB和0.18dB.微流控双稳振荡器由对称级联的两个常闭阀构成,光开关由三段嵌入在振荡器输出端的光纤波导构成,通过改变注射泵驱动微器件中液体流动的速率可以控制光开关的开关周期.利用有限元分析软件对影响开关周期的因素进行了仿真研究.结果表明,当液体的注入流速从0.2mm/s增大到1.0mm/s时,开关周期从1.25s减小到0.26s,周期占空比约为0.5,阀的阈值与开关时间常量呈线性关系.随着常闭阀阀座的增宽,开关周期变长;阀的宽长比增大,开关周期减小;振荡器的不对称设计可以调节周期的占空比.通过调节入口流速和阀的阈值特性,可以设计特定频率的光开关,这为单入多出、多入多出光开关的后续研究提供了依据.An optofluidic switch based on microfluidic bistable oscillator was designed, which is conducive to keep up with the trends of integration, miniaturization and low power consumption. The insertion loss of the two optical outputs are 1.03 dB and 0.18dB, respectively. Microfluidic bistable oscillator consists of two symmetrical cascaded normally closed micro-valves, the optical switch is made up of three embedded optical fiber waveguides in the oscillator output part. A micro-syringe pump is used to drive the liquid and finally control the states of the switch. The impact factors of switching cycles were studied by using simulation software. The results show that when the injecting flow rate changes from 0.2 mm/s to 1.0 mm/s, the switching cycle is reduced from 1.25 s to 0.26 s. Simultaneously, the duty cycle is approximately 0.5 owing to the symmetrical design. The threshold of valve is providing the linear relationship with the switching time constants. With the widening of the normally closed valve seat, switching cycle is increased; with the decrease of valve aspect ratio, switching cycle is reduced. Moreover, asymmetrical design of the valves can adjust the duty cycle of the micro-oscillator. By adjusting the threshold characteristic of the valve and changing the inlet flow rate, an optical switch with specific frequency as need can be designed.

关 键 词：微流控 光开关 仿真 常闭阀 双稳振荡器 阈值特性 

分 类 号：TN256[电子电信—物理电子学]