Single Longitudinal Mode Fiber Laser Based on Saturated Absorber

Abstract:

In order to realize single longitudinal mode (SLM) output, an erbium-doped fiber (EDF) laser with fiber ring cavity is proposed which uses an un-pumped EDF saturated absorber as a SLM selector. Ring cavity length, coupler ratio and insertion loss which affect ring cavity filter performance are analyzed theoretically and simulated numerically. Un-pumped EDF length and Er³⁺ concentration are analyzed theoretically and simulated. Research shows that, the bigger coupling output ratio of ring cavity, the greater transmission peak; the greater mode line width; the shorter ring cavity length, the wider free spectral range; the bigger coupling loss, the smaller transmission peak; when the difference between two cavities length is big, cursor effect is not obvious. Laser threshold increases with absorber length increasing; the bigger saturated absorber concentration, the higher laser threshold.

• Periodical: Advanced Materials Research (Volumes 1044-1045)
• Pages: 426-431
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1044-1045.426
• Online since: October 2014
• Authors: Wu Pan, Hong Lin Zhang, Zheng Ke Xu, Hui Zhang
• Keywords: Fiber Laser, Fiber Ring Cavity, Laser Technology, Single Longitudinal Mode, Un-Pumped EDF

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