光纤气泡微腔传感技术

Optical Fiber Sensors Based on In-Fiber Air Bubble Microcavirties

基于光纤气泡微腔的干涉仪在光纤传感领域中已经获得广泛关注.结合最新研究进展,给出了一种电弧放电法制备光纤气泡微腔的新技术,该技术仅利用商用光纤熔接机且无需辅助设备.系统研究了基于光纤气泡微腔的法布里-珀罗干涉仪的工作原理、制备方法及传感应用,实现了基于矩形气泡微腔的光学回音壁模式谐振器,进一步完成了腔模式的应变调谐.

Optical fiber sensors based on Fabry-Perot interferometer （FPI） with an in- fiber air bubble have attracted much attention for sensing applications in gas-pressure and tensile-strain measurement. Based on the recent research progress, a new technique is presented, which can create an air-bubble-based FPI by means of improved electrical arc discharge. Only a common fusion splicer is needed without any additional equipment. In this paper, the FPI sensor with air bubbles is described. The fabrication method, principle of operation and sensing applications are discussed. Furthermore, a novel optical micro- resonator based on an in-fiber rectangular air bubble is demonstrated. Whispering-gallery modes can be tuned by applying tensile strain to the rectangular air bubbles.