Study on broadband supercontinuum generation by highly GeO2 doped fiber

Broadband supercontinuum generation in highly GeO₂ doped fibers holds significant appeal for researchers due to their distinct advantages. In this study, we propose employing a low repetition rate noise-like pulse mode-locked fiber laser as the pulse seed for mid-infrared supercontinuum generation in such fibers. Utilizing only one amplifier stage to amplify the noise-like pulse, we achieved a broadband supercontinuum with a 20dB bandwidth spanning from approximately 652nm to 3350nm in a highly GeO₂ doped fiber with a core GeO₂ concentration of 98%, even with an output power as low as 297mW. To the best of our knowledge, this represents the widest supercontinuum achieved in highly GeO₂ doped fibers to date. Additionally, we observed that further increases in pump power resulted in damage to the core of the highly GeO₂ doped fibers. This posed a challenge in expanding the spectral range of the output supercontinuum by simply increasing the peak pulse power. This conclusion is of significant reference value for research on supercontinuum generation based on highly GeO₂ doped fibers.