Abstract

In this paper, effective multiplexing for a very large number of FBG-based Fabry-Perot (FBGFP) sensors is proposed, which is based on combination of wavelength division multiplexing (WDM) and spatial-frequency division multiplexing (SFDM). For WDM, FBGFP sensors are arranged in different wavelength domains formed by a series of chirped FBGs with different central wavelengths while the sensors with different cavity lengths within the same wavelength domain are multiplexed by using SFDM as they have different spatial frequencies resulted from different cavity lengths. The experimental results show that a strain accuracy of better than ± 10με has been achieved with little cross-talk.

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