3 February 1999 Active WDM demodulation scheme for fiber Bragg grating sensors
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Abstract
A closed loop technique for measuring Bragg wavelength shifts based on active wavelength tuning of a WDM coupler is presented. By stretching the coupling region of a fused biconical WDM, the 3 dB point is set by the feedback loop to always match the reflected Bragg wavelength. With this scheme, sensitivities usually associated with highly selective WDM can be obtained without compromising the measurement range.
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Francisco M. Araujo, Francisco M. Araujo, Luis Alberto Almeida Ferreira, Luis Alberto Almeida Ferreira, Jose Luis Santos, Jose Luis Santos, Faramarz Farahi, Faramarz Farahi, } "Active WDM demodulation scheme for fiber Bragg grating sensors", Proc. SPIE 3541, Fiber Optic and Laser Sensors and Applications; Including Distributed and Multiplexed Fiber Optic Sensors VII, (3 February 1999); doi: 10.1117/12.339109; https://doi.org/10.1117/12.339109
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