We investigated the characteristics of femtosecond pulse amplification using an ytterbium (Yb) highly doped bismuth-oxide -based glass fiber (YDBF) for a high-power, highly effective, compact ultrashort pulse amplifier. We conducted similar experiments using an Yb-doped silica glass fiber amplifier (YDF) for comparison. The output power of a 16.9 cm long YDBF amplifier was 1.6 times higher than that of a 300.0 cm YDF amplifier. However, we observed parasitic lasing in both experiments at high-power operation. Of the various long YDBFs that were evaluated, femtosecond seed pulses at 1033 nm and 1048 nm were amplified by the 106.5 cm YDBF. No energy transfer from the ultrashort pulse amplification to the parasitic lasing was observed. This is the first reported investigation of the YDBF amplifier using a femtosecond pulse.

Yb-doped bismuth-based glass fiber, Yb-doped fiber, femtosecond, fiber amplification, 1-mm-band, T-band, optical telecommunication.