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In this letter, a narrow line-width ytterbium-doped fiber ring laser with a fiber Bragg grating inside the cavity is proposed and experimentally demonstrated. In order to realize single longitudinal mode (SLM) output, an un-pumped ytterbium-doped fiber is used as an SLM selector. First, the effect of the coupler output ratio on the output power and the threshold power is discussed in this proposed...
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