Sensor Fibres and a New Concept for Distributed Temperature and Strain Sensing by Brillouin Scattering

Garus, Dieter; Geinitz, E.; Gogolla, Torsten; Jetschke, Sylvia; Krebber, Katerina; Röpke, U.; Unger, Sonja

doi:10.1364/ofs.1996.th328

Cited by 2 publications

(1 citation statement)

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“…For a defined frequency difference of the two counterpropagating lightwaves, the Brillouin frequency, a maximum interaction between pump and probe laser waves occurs . This frequency difference is a measure for the spatial distribution of temperature or stress on the fibre path [15,16]. 343 BFRL PC DUT…”

Section: The Bfrl In the Botda Measurement Setupmentioning

confidence: 99%

<title>Stabilized Brillouin fiber ring laser (BFRL) using low-loss fused single-mode resonator couplers for application in distributed fiber sensor systems</title>

Moratzky¹,

Schroeter²,

Geinitz³

1997

SPIE Proceedings

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Low loss fused single-mode fibre couplers for high finesse ring resonators (finesse 150 .. 300) have been manufactured for use in the BFRL. The fused fibre couplers have coupling ratios from 1 .2 % to 5% with excess loss less than 0.009dB ( <0.2 %). These components represent the passive part of an all-fibre Brillouin ring-laser pumped by a Nd:YAG-laser @X= 1319nm wavelength. With FM-sideband modulation technique [1 ,2 we stabilized the round trip wave in the ring resonator RRes, adjusting actively the laser frequency by a thermoelectric cooler and a piezoelectric element. Above pump threshold (about 1 1OjtW at 40m fibre length and finesse= 132) the RRes starts stimulated Brillouin backscattering. This 13GHz-frequency-shifted-BFRL light source can be used as a probe laser for Brillouinsensing in a Brillouin optical-fibre time domain analysis (BOTDA) measurement setup.

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Section: The Bfrl In the Botda Measurement Setupmentioning

confidence: 99%