Optical fiber Fabry-Perot cavity applied to an optical microphone

Junlei Chang; Wen Xiao

doi:10.1117/12.807627

13 October 2008 Optical fiber Fabry-Perot cavity applied to an optical microphone

Junlei Chang, Wen Xiao

Proceedings Volume 7129, Seventh International Symposium on Instrumentation and Control Technology: Optoelectronic Technology and Instruments, Control Theory and Automation, and Space Exploration; 71290I (2008) https://doi.org/10.1117/12.807627
Event: Seventh International Symposium on Instrumentation and Control Technology, 2008, Beijing, China

Abstract

A new installation structure of optical fiber Fabry-Perot (F-P) cavity is proposed to function in an optical microphone. The F-P cavity consists of an optical fiber end with self-focused lens and a sound-sensitive membrane. Distance between the two parts is the F-P cavity length. The sound membrane is produced by semiconductor sculpture, which guarantees its tiny size, uniform thickness and high sensitivity to sound. The membrane responds to the sound vibration and vibrates in concavo-convex shape, which results in the change of cavity length, so the F-P cavity performs as an optical microphone. A mathematical model for this kind of arc F-P cavity is also proposed to study the optical microphone. The arc end is assimilated to a step-like model, so the arc F-P cavity equals an assembly of annular plane-end F-P cavities. The mathematical model is educed by simple integral of the annular plane-end F-P cavities and multi-beam interference theory. Relevant simulation and experiments are executed, which confirm the accuracy of the mathematical model and feasibility of the installation structure.

Citation Download Citation

Junlei Chang and Wen Xiao "Optical fiber Fabry-Perot cavity applied to an optical microphone", Proc. SPIE 7129, Seventh International Symposium on Instrumentation and Control Technology: Optoelectronic Technology and Instruments, Control Theory and Automation, and Space Exploration, 71290I (13 October 2008); https://doi.org/10.1117/12.807627

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