Effects of Rayleigh backscattering on the stability of distributed feedback fiber laser sensors

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

doi:10.1117/1.OE.53.6.066102

11 June 2014 Effects of Rayleigh backscattering on the stability of distributed feedback fiber laser sensors

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

Author Affiliations +

Funded by: National Natural Science Foundation of China, National Science Foundation of China, Overall Strategic Cooperation Program of Guangdong Province and Chinese Academy of Sciences

Optical Engineering, Vol. 53, Issue 6, 066102 (June 2014). https://doi.org/10.1117/1.OE.53.6.066102

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.

Citation Download Citation

Tuanwei Xu, Meizhen Ren, Jun He, Gaosheng Fang, Fang Li, and Yuliang Liu "Effects of Rayleigh backscattering on the stability of distributed feedback fiber laser sensors," Optical Engineering 53(6), 066102 (11 June 2014). https://doi.org/10.1117/1.OE.53.6.066102

Published: 11 June 2014

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