Abstract
An interrogation system for large-capacity fiber-distributed sensing was proposed and implemented. The system is based on the time- and wavelength-division multiplexed method and ultraweak fiber Bragg grating (FBG) sensor arrays. A narrow-linewidth tunable light source consisting of a distributed feedback laser array is used, which can be directly modulated into nanosecond pulses with a wide tuning range. Theoretically, the system can achieve a demodulation of > 10,000 gratings and the FBG can be placed closely. An experimental system was implemented and the performance of the established system was tested, including its wavelength demodulation, time-division multiplexing, and temperature-sensing characteristics. The prototype achieved 27-nm wavelength demodulation and successfully demodulated 10 ultraweak grating strings of the same wavelength. By rationally planning the grating network, we can evaluate from the experimental results that the prototype can achieve at least 220 grating demodulation.
Published Version
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