5 October 2006 Coherence multiplexing of sensors based on long-period fibre grating Mach-Zehnder interferometers
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Proceedings Volume 6351, Passive Components and Fiber-based Devices III; 635124 (2006) https://doi.org/10.1117/12.688307
Event: Asia-Pacific Optical Communications, 2006, Gwangju, South Korea
Abstract
A novel interrogation scheme for multiplexing the sensors based on long-period grating (LPG) Mach-Zehnder interferometers (MZIs) is proposed. Each LPG-MZI is formed by a pair of cascaded identical LPGs and induces an additional optical path difference (OPD) proportional to the centre-to-centre interval between the two LPGs. A sub-reflectogram including sensing information can be achieved when the OPD induced in one LPG-MZI is compensated by scanning one arm of a Michelson interferometer to a certain range. For multiple sensors, the grating intervals of different LPG-MZIs are set to different values to ensure that their sub-reflectograms can be well separated in time domain. The spectral response of the LPG-MZI is reconstructed from the corresponding sub-reflectogram with a fast Fourier transformation. Applications of the bending and temperature monitoring are demonstrated by measuring the signals in time domain and wavelength domain, respectively.
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Zu-Guang Guan, A. Ping Zhang, Ran Liao, Meng Jiang, Sailing He, "Coherence multiplexing of sensors based on long-period fibre grating Mach-Zehnder interferometers", Proc. SPIE 6351, Passive Components and Fiber-based Devices III, 635124 (5 October 2006); doi: 10.1117/12.688307; https://doi.org/10.1117/12.688307
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