Abstract
A fluoride optical fiber with low impurity and defect content has been fabricated using high-purity raw materials and a dry fluorination method. The 160-meter-long fabricated fiber shows a minimum transmission loss of 1.2 dB/km at a 2.30-µm wavelength and transmission losses of less than 10 dB/km in the 0.8–2.7 µm wavelength region. It seems that the transmission loss in the 0.3–0.4 µm wavelength region is dominantly due to Rayleigh scattering, and that a weak absorption tail with lower loss than that in pure silica glasses is the second major loss factor in this region.
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