A new fiber-optic microphone based on waveguide modulator

Chengmei Zhang; Shenglai Zhen; Bo Zhang; Fei Ai; Shuangxi Zhang; Benli Yu

doi:10.1117/12.838047

23 November 2009 A new fiber-optic microphone based on waveguide modulator

Chengmei Zhang, Shenglai Zhen, Bo Zhang, Fei Ai, Shuangxi Zhang, Benli Yu

Proceedings Volume 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications; 750819 (2009) https://doi.org/10.1117/12.838047
Event: International Conference on Optical Instrumentation and Technology, 2009, Shanghai, China

Abstract

A new fiber-optic microphone was demonstrated theoretically and experimentally in this paper. The microphone is based on Mach-Zehnder and Sagnac interferometers, which comprise an amplified spontaneous emission (ASE) light source, a conventional single-mode fiber, a fiber reflector and two 3dB couplers. As two light paths have the same optical length but travel different sequence paths in this hybrid interferometer, the beams in different paths pass through the sensing fiber at different times and the phase signals differ from each other. Utilizing the two light paths interfered and fiber waveguide modulator replaced by piezoelectric ceramic (PZT) modulation, to implement the direct acquiring of weak voice signals. Adoption of the ASE light source and the single-mode fiber as sensing fiber decreases the system cost. The application of the fiber waveguide modulator overcomes the limitation in high frequency and nonlinear effect of PZT modulation, improves the flexibility of the system and the frequency response range. Phase shifts of the two interfered beams, which is caused by the slowly varying environmental parameter, is equal to eliminate the influence from outside effectively. In this system, the signal demodulation circuit based on weak voice signal is simpler than the PGC demodulation circuit. The experimental results of the fiber-optic microphone based on waveguide modulator have been demonstrated that the simple circuit demodulation for the weak voice signal is feasible.

Citation Download Citation

Chengmei Zhang, Shenglai Zhen, Bo Zhang, Fei Ai, Shuangxi Zhang, and Benli Yu "A new fiber-optic microphone based on waveguide modulator", Proc. SPIE 7508, 2009 International Conference on Optical Instruments and Technology: Advanced Sensor Technologies and Applications, 750819 (23 November 2009); https://doi.org/10.1117/12.838047

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