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Optical Engineering

Effects of Rayleigh backscattering on the stability of distributed feedback fiber laser sensors
Author(s): Tuanwei Xu; Meizhen Ren; Jun He; Gaosheng Fang; Fang Li; Yuliang Liu
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Paper Abstract

Rayleigh backscattering induces mode hopping of distributed feedback (DFB) fiber lasers in the sensor array, and the critical length related to Rayleigh backscattering limits the size of DFB fiber laser sensor networking. Based on a three-mirror cavity model, the critical length for a DFB fiber laser is derived. It increases nearly exponentially with the coupling coefficient for the ideal π -shifted DFB fiber lasers. The reflectivity of the sub-fiber Bragg grating at the lasing wavelength is the main factor to resist Rayleigh backscattering for a nonideal DFB fiber laser. The corresponding experiments have been carried out, and the critical length of larger than 150 m was achieved for 42-mm-long DFB fiber lasers.

Paper Details

Date Published: 11 June 2014
PDF: 5 pages
Opt. Eng. 53(6) 066102 doi: 10.1117/1.OE.53.6.066102
Published in: Optical Engineering Volume 53, Issue 6
Show Author Affiliations
Tuanwei Xu, Institute of Semiconductors (China)
Meizhen Ren, Institute of Semiconductors (China)
Jun He, Institute of Semiconductors (China)
Gaosheng Fang, Institute of Semiconductors (China)
Fang Li, Institute of Semiconductors (China)
Yuliang Liu, Institute of Semiconductors (China)

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