Demodulation system of fiber grating sensors based on phase-lock and cross phase modulation

Jinlong Zhang; Chongxiu Yu; Kuiru Wang; Meimei Lin; Junying Zeng

doi:10.1117/12.743730

21 November 2007 Demodulation system of fiber grating sensors based on phase-lock and cross phase modulation

Jinlong Zhang, Chongxiu Yu, Kuiru Wang, Meimei Lin, Junying Zeng

Proceedings Volume 6781, Passive Components and Fiber-based Devices IV; 67812L (2007) https://doi.org/10.1117/12.743730
Event: Asia-Pacific Optical Communications, 2007, Wuhan, China

Abstract

The XPM technique is applied to the demodulation system for fiber grating sensor for the first time in this thesis. According to XPM principle, the intensity of accessorial light can be altered by feedback control and the phase of the light signal from the M-Z interferometer can be modulated in a phase-locked way, thus the system phase-difference can be locked at the point of the highest sensitivity. It resolves the precision non-linearity of interferometric demodulation, the limit of very small range for demodulating, the non-linearity of the demodulating sensitivity, the affect of backlight and undercurrent pair in the demodulating circuit, the delay-effect by PZT tune and the error from the machine.

Citation Download Citation

Jinlong Zhang, Chongxiu Yu, Kuiru Wang, Meimei Lin, and Junying Zeng "Demodulation system of fiber grating sensors based on phase-lock and cross phase modulation", Proc. SPIE 6781, Passive Components and Fiber-based Devices IV, 67812L (21 November 2007); https://doi.org/10.1117/12.743730

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