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Although bismuth doped fiber amplifier could provide ultra-wideband gain, the gain inhomogeneity might ultimately restrict its applicable bandwidth. This work explores this limitation through experimental measurements of signal dependent gain deformation.

We demonstrate a continuous-wave ring-cavity bismuth-doped fiber laser emitting at 1725 nm. By optimizing the output coupling ratio to maximize the laser power, we obtain 16.1 dBm at a pump power of 511 mW.