In this Letter, we report single-mode fibers made of chalcogenide glasses with low loss in the $5–12\mathrm{\mu m}$ range. Glasses from the Ge–As–Te–Se system were optimized to prevent nucleation and to exhibit low density of charge carriers. Single-mode fibers were obtained through the rod-in-tube method by substituting 2% Te/Se between the core and cladding glasses. The resulting single-mode fibers had a core diameter of $30\mathrm{\mu m}$ and exhibited losses of ~6 dB/m at $10.6\mathrm{\mu m}$ , and as low as $3–4\mathrm{dB}/\mathrm{m}$ in the $6–10\mathrm{\mu m}$ range.

© 2010 Optical Society of America

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