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Under 980 nm pumping, we observed an energy transfer from Er3+ to BAC-Al in BEDF, evidenced by the enhanced NIR emission and lifetime when compared with a bismuth doped fiber (BDF). Under 830 nm pumping, the spectral performance of Er3+ in BEDF is found to benefit from BAC-Al→Er3+, evidenced by the notable increase in NIR emission, lifetime, and gain. The observations confirm that proper codoping of Er in Bi-doped fibers could introduce significant changes to emission through ET processes and provides a promising strategy for improving spectral performance over the 1000-1600 nm 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