paper 150123042432

Abstract

An erbium-doped fiber laser with low coherence, low threshold, high efficiency and narrow linewidth is demonstrated for the first time based on distributed feedback from a fiber Bragg grating (FBG) array. The FBG array contains tens of FBGs with identical Bragg wavelength but very weak reflectivity of ∼ 5‰, inscribed along a normal single-mode fiber with random separations. Low pump threshold power of 3.0 mW and high slope efficiency of 24% are achieved, which are comparable with that of normal erbium-doped fiber lasers but much better than that of conventional random fiber lasers based on distributed Rayleigh scattering.

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Xinyong Dong

Perry Ping Shum

Haibin Su

Junwei Yuan

Lei Zhu