9 November 2017 Time- and wavelength-division multiplex distributed sensing interrogation system based on distributed feedback laser array and ultraweak fiber Bragg grating
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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.
© 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)
Kai Tian, Kai Tian, Gen-Xiang Chen, Gen-Xiang Chen, Qiu-Yan Song, Qiu-Yan Song, Yun-Shu Gao, Yun-Shu Gao, Hao-Tian Zhang, Hao-Tian Zhang, } "Time- and wavelength-division multiplex distributed sensing interrogation system based on distributed feedback laser array and ultraweak fiber Bragg grating," Optical Engineering 56(11), 117104 (9 November 2017). https://doi.org/10.1117/1.OE.56.11.117104 . Submission: Received: 13 April 2017; Accepted: 18 October 2017
Received: 13 April 2017; Accepted: 18 October 2017; Published: 9 November 2017
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