The net gains of 5.1 and 4.4-dB for a 300-nm broadband single-mode Cr-doped crystalline core fiber (SMCDCCF) are in demonstration with and without thermal annealing, respectively. The gain improvement was mainly achieved by enhancing the tetrahedral chromium (Cr4+(tetra))-ions up to 17% in the SMCDCCF annealing.

© 2019 The Author(s)

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