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We develop a high-power narrow-linewidth fiber amplifier based on a taperedYb-doped fiber. In the experiment, the narrow end of the tapered fiber is usedas the input port of both pump source and signal light to form a robustall-fiber configuration. The stimulated Brillouin scattering (SBS) iseffectively suppressed owing to its gradually increased mode area as well ascontinuously changed Brillouin frequency shift dependent on the core diameter.As a result, an output power of 260 W without SBS and mode instability (MI) isobtained, with a slope efficiency of 71.3 % and a narrow linewidth of ~2GHz.However, the MI rather than SBS is observed when output power reaches 260 W.The features of MI are experimentally studied in detail. It is pointed outthat, the MI seems the primary and durative limitation factor of the taperedfiber amplifier for high-power narrow-linewidth output, although it hasadvantage to reduce other nonlinear effect. To the best of our knowledge, thisis the first detailed experimental study on MI in a tapered fiber. At last,some worthwhile discussion about the optimization of the tapered fiber and thewhole system for both SBS and MI suppression is conducted based on the presentand previous results.

Study on the power scaling and mode instability property in an all-fiber narrow-linewidth tapered fiber amplifier