Journal
IEEE PHOTONICS TECHNOLOGY LETTERS
Volume 34, Issue 23, Pages 1261-1264Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2022.3210929
Keywords
Fiber gratings; Reflection; Frequency modulation; Semiconductor optical amplifiers; Measurement by laser beam; Temperature measurement; Semiconductor laser arrays; Distributed feedback laser array; dual-wavelength differential detection; fiber Bragg grating; interrogation
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The dual-wavelength differential detection technique of fiber Bragg gratings is described in this study. A directly modulated distributed-feedback laser array is used as a frequency-scanning pulsed light source. By measuring two serially connected Bragg gratings using the pulse trains, the selectivity of high-sensitivity measurement, wide measurement range, and the potential for expansion to time-division multiplexing systems are demonstrated.
The dual-wavelength differential detection of fiber Bragg gratings is reported. A directly modulated distributed-feedback laser array is used as a frequency-scanning pulsed light source. Trains of four 100-ns pulses with a frequency drift of 6.5 GHz and the same intensity are generated. Interrogating two serially connected Bragg gratings using the pulse trains, we show the selectivity of the high-sensitivity measurement and the wide measurement range, and the possibility of expansion to time-division multiplexing systems with a simple setup.
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