Design and experimental analysis of fiber grating vibration demodulation system based on the 3 × 3 coupler

Abstract

A novel fiber grating vibration demodulation system, based on 2×2 and 3×3 couplers, is designed. Based on the phase unwrapping algorithm, the three-way asymmetrical output of the 3×3 coupler and demodulation state characteristics of the system when the vibration signal includes high harmonic waves are analyzed in simulations. The result shows that when the three-way output is asymmetrical, the maximum deviation of demodulation signal is 1.625%, and when the vibration signal includes high harmonic waves, the maximum deviation of demodulation signal is 0.9%. The corresponding experiment is conducted. The experimental result shows that the dynamic resolution of the system is 25.22 nɛ /

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when the vibration pitch is 5.5 Hz.

Keywords

Coupler / Free Vibration / Vibration Signal / Amplify Spontaneous Emission / Maximum Relative Error

References

[1] ZhangJ.-l., YuC.-x., WangK.-r., LinM., ZhaoD.-x.. Journal of Optoelectronics · Laser, 2008, 19: 743

[2] YuY., TamH., ChungW.. Acta Optica Sinica, 2001, 8: 987

[3] LiZ.-q., HuangL.-j., WuF., WangL., ZhangX.-m.. Journal of Optoelectronics · Laser, 2004, 15: 569

[4] JiaZ.-a., ZhangL., QiaoX.-g., MaC.. Journal of Optoelectronics · Laser, 2008, 19: 315

[5] YangZ., Bai-OuG., Hwa-YawT.. Optics Communications, 2008, 281: 4619

[6] ZhaoY., LiaoY.. Optics and Lasers in Engineering, 2004, 41: 1