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Method for Reducing Crosstalk Interference in an Inline Fabry-Perot Based Fiber Bragg Grating Sensor Array Based on Layer Peeling Algorithm

Author: LuYang
Tutor: MengZhou；MaLiNa
School: National University of Defense Science and Technology
Course: Optical Engineering
Keywords: Delamination algorithm Time division multiplexing Crosstalk suppression Fiber Bragg Grating Sensor
CLC: TP212
Type: Master's thesis
Year: 2011
Downloads: 10
Quote: 0
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Abstract


With the development of fiber gratings and optical fiber sensing technology , large-scale optical fiber sensing system based on fiber grating become a hot research field of fiber optic sensing , and has a broad application prospects . Time division multiplexing is the most basic and effective reuse technology to build large-scale fiber optic sensing array , however, time-division multiplexing crosstalk noise to improve the fiber-optic sensing system has become a serious impact on the detection sensitivity of the optical fiber sensing system , reuse the number of restricted and the important factors of the array size . In this paper, Fabry-Perot cavity fiber grating sensor system based on the algorithm of delamination time division multiplexing crosstalk suppression technology . The theoretical analysis of the the delamination algorithm suppress the time-division multiplexing crosstalk mechanism to study the key technologies , such as polarization-independent signal processing technology , the response matrix algorithm , and designed according to the characteristics of the response matrix based on optical heterodyne demodulation technique response matrix method for solving . Designed and built according to the principle of the delamination algorithm crosstalk suppression based the FP cavity fiber grating sensor TDM system , innovative proposed polarizer in place the polarization switch using delamination algorithm to achieve the two-way time-division multiplexed optical signal the signal demodulating and crosstalk suppression. The experimental results show that the the delamination algorithm can effectively suppress the Fabry-Perot cavity fiber grating sensor system in time division multiplexing crosstalk . On the frequency of 1kHz, the signal amplitude 0.5rad delamination algorithm can reduce the signal crosstalk 12dB . In the frequency range 630Hz to 2kHz , the range signal from 0.25rad 1.6rad between , the peel layer algorithm their crosstalk generated have some inhibitory effect. Thesis for the inhibition of time-division multiplexing crosstalk to promote fiber grating sensor system and laid the technical foundation for the development of large scale array .

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