Title :
Remote (155 km) Fiber Bragg Grating Interrogation Technique Combining Raman, Brillouin, and Erbium Gain in a Fiber Laser
Author :
Leandro, Daniel ; Ullan, Angel ; Loayssa, Alayn ; López-Higuera, Jose Miguel ; López-Amo, Manuel
Author_Institution :
Dept. de Ing. Electr. y Electron., Univ. Publica de Navarra, Pamplona, Spain
fDate :
5/15/2011 12:00:00 AM
Abstract :
We present and demonstrate a technique for remote sensing of fiber Bragg gratings (FBGs) beyond 150 km. The system combines Raman, Brillouin, and erbium gain in a linear cavity fiber laser and deploys a novel heterodyne detection technique to avoid the signal-to-noise ratio limitations produced by Rayleigh scattering. Two FBGs located in series were interrogated at 155 km away from the processing unit using 0.6 W of Raman pump and less than 2 mW of Brillouin pump provided by a tunable wavelength-swept laser. Heterodyne detection brings forth a signal-to-noise ratio of approximately 10 dB in our measurements.
Keywords :
Raman lasers; Rayleigh scattering; fibre lasers; heterodyne detection; remote sensing by laser beam; Brillouin laser; Raman laser; Rayleigh scattering; distance 155 km; erbium gain; fiber Bragg gratings; heterodyne detection technique; interrogation technique; linear cavity fiber laser; remote sensing; signal-to-noise ratio; Erbium-doped fiber lasers; Fiber gratings; Laser excitation; Optical fiber sensors; Scattering; Stimulated emission; Brillouin fiber laser; Raman fiber laser; fiber Bragg grating (FBG); interrogation technique; remote sensing; sensor multiplexing;
Journal_Title :
Photonics Technology Letters, IEEE
DOI :
10.1109/LPT.2011.2119298
