期刊
IEEE PHOTONICS TECHNOLOGY LETTERS
卷 34, 期 10, 页码 509-512出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2022.3168853
关键词
Fiber gratings; Reflection; Wavelength division multiplexing; Optical fiber sensors; Fiber lasers; Signal to noise ratio; Semiconductor optical amplifiers; Distributed feedback laser; fiber Bragg grating; interrogation; wavelength-division multiplexing (WDM)
This study reports the wavelength-division multiplexed interrogation of fiber Bragg gratings using a directly modulated distributed-feedback laser array as a multi-wavelength, frequency scanning, pulsed-light source. The heterodyne detection technique is employed to increase the signal-to-noise ratio of weak reflection signals. Reflections from three fiber Bragg gratings with different peak wavelengths are simultaneously observed as beat oscillations, with clear reflection spectra visible at a signal-to-noise ratio of approximately 20 dB.
Wavelength-division multiplexed interrogation of fiber Bragg gratings (FBGs) is reported. A directly modulated distributed-feedback laser array is used as a multi-wavelength, frequency scanning, pulsed-light source. A heterodyne detection technique is used to increase the signal-to-noise ratio of weak reflection signals. Reflections from three fiber Bragg gratings with different peak wavelengths are simultaneously observed as beat oscillations. Reflection spectra are clearly seen with a signal-to-noise ratio of approximately 20 dB from the three fiber Bragg gratings with a reflectivity of 1% and an interval of approximately 1.5 m.
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