High accuracy demodulation for twin-grating based sensor network with hybrid TDM/FDM

Fan Ai; Qizhen Sun; Jianwei Cheng; Yiyang Luo; Zhijun Yan; Deming Liu

doi:10.1117/12.2265573

23 April 2017 High accuracy demodulation for twin-grating based sensor network with hybrid TDM/FDM

Fan Ai, Qizhen Sun, Jianwei Cheng, Yiyang Luo, Zhijun Yan, Deming Liu

Proceedings Volume 10323, 25th International Conference on Optical Fiber Sensors; 103234A (2017) https://doi.org/10.1117/12.2265573
Event: 25th International Conference on Optical Fiber Sensors, 2017, Jeju, Korea, Republic of

Abstract

We demonstrate a high accuracy demodulation platform with a tunable Fabry-Perot filter (TFF) for twin-grating based fiber optic sensing network with hybrid TDM/FDM. The hybrid TDM/FDM scheme can improve the spatial resolution to centimeter but increases the requirement of high spectrum resolution. To realize the demodulation of the complex twin-grating spectrum, we adopt the TFF demodulation method and compensate the environmental temperature change and nonlinear effect through calibration FBGs. The performance of the demodulation module is tested by a temperature experiment. Spectrum resolution of 1pm is realized with precision of 2.5pm while the environmental temperature of TFF changes 9.3°C.

Citation Download Citation

Fan Ai, Qizhen Sun, Jianwei Cheng, Yiyang Luo, Zhijun Yan, and Deming Liu "High accuracy demodulation for twin-grating based sensor network with hybrid TDM/FDM", Proc. SPIE 10323, 25th International Conference on Optical Fiber Sensors, 103234A (23 April 2017); https://doi.org/10.1117/12.2265573

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