Performance study on a tunable multiwavelength erbium-doped fiber laser based on nonlinear optical loop mirror and Lyot birefringence fiber filter

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In this paper, the performance study on the tunable multiwavelength erbium-doped fiber laser is conducted, which is based on combination of Lyot birefringence fiber filter and nonlinear fiber loop mirror. The method to achieve its optimal working is introduced in detail. The parameters choice based on the best tunability is analyzed from three different perspectives: gain medium, nonlinear effect and comb filter, respectively. All the experimental results will be given through several panels of comparison experiments. The optimal performance will finally be achieved by setting appropriate parameters. The study in this paper will further improve the function of tunable fiber filter.