Abstract
In this paper the influence of un-pumped Erbium-Ytterbium doped fibers (EYDF) on the statistical properties of random fiber lasers (RFLs) with linear cavity based on Rayleigh scattering is investigated. The experimental results show that the probability density function (PDF) of temporal characteristics of both lasers with and without un-pumped EYDF are asymmetrically distributed near threshold and Gaussian distributed far away over threshold. The width of the PDFs first increases and then decreases with pump power when the un-pumped EYDF is not inserted, while the width of the PDFs continuously increases with pump power when the un-pumped EYDF is inserted, which indicates that EYDF insertion makes the laser more stable at lower pump power and more unstable at higher pump power. The radiation with un-pumped EYDF is fully uncorrelated at high pump power. And the radiation without un-pumped EYDF is also fully uncorrelated at high pump power.
Published Version
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