We present a new method for the interrogation of large arrays of Bragg grating sensors. Eight gratings operating between the wavelengths of 1533 and 1555 nm have been demultiplexed. An unbalanced Mach– Zehnder interferometer illuminated by a single low-coherence source provides a high-phase-resolution output for each sensor, the outputs of which are sequentially selected in wavelength by a tunable Fabry–Perot interferometer. The minimum detectable strain measured was 90 nɛ/Hz−−√at 7 Hz for a wavelength of 1535 nm.
Bibliographical note© 1995 Optical Society of America This paper was published in Optics Letters and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website: http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-20-24-2544. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
Kalli, K., Zhang, L., Bennion, I., Brady, G. P., Webb, D. J., & Jackson, D. A. (1995). Wavelength-division and spatial multiplexing using tandem interferometers for Bragg grating sensor networks. Optics Letters, 20(24), 2544-2546. https://doi.org/10.1364/OL.20.002544