Abstract
A time- and wavelength-division multiplexing sensor network based on ultra-weak fiber Bragg gratings (FBGs) was proposed. The low insertion loss and the high multiplexing capability of the proposed sensor network were investigated through both theoretical analysis and experimental study. The demodulation system, which consists of two semiconductor optical amplifiers and one high-speed charge-coupled device module, was constructed to interrogate 2000 serial ultra-weak FBGs with peak reflectivity ranging from -47 dB to -51 dB and a spatial resolution of 2 m along an optical fiber. The distinct advantages of the proposed sensor network make it an excellent candidate for the large-scale sensing network.
Highlights
Large-scale fiber Bragg grating (FBG) sensor networks have attractive prospects for major engineer monitoring because of their low cost and high multiplexing capability [1, 2]
A time- and wavelength-division multiplexing sensor network based on ultra-weak fiber Bragg gratings (FBGs) was proposed
We reported a large-scale sensor network with time- and wavelength-division multiplexed (TDM + Wavelength-division multiplexing (WDM)) ultra-weak FBGs
Summary
Large-scale fiber Bragg grating (FBG) sensor networks have attractive prospects for major engineer monitoring because of their low cost and high multiplexing capability [1, 2]. A newly proposed optical time-domain reflectometry–fiber Bragg grating (OTDR–FBG) network with ultra-weak FBG array has been reported [10, 11] This design employs a tunable laser (T-LD) as light source and distinguishes different FBGs via high-speed data acquisition. We reported a large-scale sensor network with time- and wavelength-division multiplexed (TDM + WDM) ultra-weak FBGs. The demodulation system consists of two SOAs and one highspeed charge-coupled device (CCD) module. The demodulation system consists of two SOAs and one highspeed charge-coupled device (CCD) module The former is used to separate the reflected signals from different FBGs in the time domain, and the latter is utilized to detect the wavelength shift quickly. The high multiplexing capability and the fast interrogation make the development of sensor networks containing thousands of FBGs possible
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