Multi-channel output of time division multiplexed fiber Bragg grating sensing network based on a cascade electrical switches array

Shengchun Liu; Jintao Zhang; Youlong Yu

doi:10.1117/12.687542

28 September 2006 Multi-channel output of time division multiplexed fiber Bragg grating sensing network based on a cascade electrical switches array

Shengchun Liu, Jintao Zhang, Youlong Yu

Author Affiliations +

Proceedings Volume 6354, Network Architectures, Management, and Applications IV; 63542G (2006) https://doi.org/10.1117/12.687542
Event: Asia-Pacific Optical Communications, 2006, Gwangju, South Korea

Abstract

Multi-channel output of time division multiplexed fiber Bragg grating sensing network was realized using a cascaded electrical switches array. The emission of a broadband light source modulated by an electro-optic modulator was injected into a four-element fiber Bragg grating sensor array spaced 10m apart. The clock-signal, which is the same as the modulating signal from the electro-optic modulator, was exploited to control the secondary cascaded switches. The signal outgoing from switches was allocated by the pulses and reflected by the sensor elements into a cascade electrical switches array. The sensor signal was then transmitted to the corresponding parallel linking switch that was controlled by the time-delay signal generator on the basis of the time delay of the sensor signal, arriving at the cascaded electrical switches array. By using demodulation with the unbalanced Michelson interferometer, which converted the wavelength shift to phase changes, the measurand was attained by the phase meter. Performance of the proposed system with a sensing sensitivity at the wavelength of 1560 nm found to be 1.654 Deg per micro-strain, which has good agreement with theoretical estimation of 1.673 Deg per micro-strain.

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Shengchun Liu, Jintao Zhang, and Youlong Yu "Multi-channel output of time division multiplexed fiber Bragg grating sensing network based on a cascade electrical switches array", Proc. SPIE 6354, Network Architectures, Management, and Applications IV, 63542G (28 September 2006); https://doi.org/10.1117/12.687542

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KEYWORDS

Switches

Fiber Bragg gratings

Sensors

Multiplexing

Michelson interferometers

Signal detection

Sensing systems

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