Abstract
Bismuth-doped optical fibers and fiber lasers operating in 1625-1775nm range have been developed for the first time to the best of our knowledge. Now the existing bismuth-doped lasers, including the result presented in this Letter, can cover O, E, S, C, L, and U telecommunication bands. In addition, new data on the nature of the bismuth-related active center were obtained and discussed.
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