Effects of Rayleigh backscattering on distributed feedback fiber laser sensors

Tuanwei Xu; Meizhen Ren; Jun He; Gaosheng Fang; Fang Li; Yuliang Liu

doi:10.1117/12.2073022

3 December 2014 Effects of Rayleigh backscattering on distributed feedback fiber laser sensors

Tuanwei Xu, Meizhen Ren, Jun He, Gaosheng Fang, Fang Li, Yuliang Liu

Proceedings Volume 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors; 92973B (2014) https://doi.org/10.1117/12.2073022
Event: International Symposium on Optoelectronic Technology and Application 2014, 2014, Beijing, China

Abstract

Rayleigh backscattering induces mode hopping of 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 three-mirror cavity model, the critical length for DFB fiber lasers are derived. It increases nearly exponentially with the coupling coefficient for the ideal π-shifted DFB fiber lasers. While the reflectivity of the sub-FBG at lasing wavelength is the main factor to resist Rayleigh backscattering for a non-ideal DFB fiber laser. The corresponding experiments have been carried out, and the results agree with the predictions.

Citation Download Citation

Tuanwei Xu, Meizhen Ren, Jun He, Gaosheng Fang, Fang Li, and Yuliang Liu "Effects of Rayleigh backscattering on distributed feedback fiber laser sensors", Proc. SPIE 9297, International Symposium on Optoelectronic Technology and Application 2014: Laser and Optical Measurement Technology; and Fiber Optic Sensors, 92973B (3 December 2014); https://doi.org/10.1117/12.2073022

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