Abstract
Recent developments in As–S glass fibres showed that increase in degree of purity of As–S glasses allowed optical fibres to be fabricated with minimum optical losses of multimode optical fibres 23–45 dB/km at 2.2–2.7 μm, 50–70 dB/km at 3.2–3.6 μm, 200–300 dB/km at 4.1–4.7 μm and 300–500 dB/km at 5.0–5.5 μm. The bending strength of optical fibres with diameter of 400 μm increased from ∼0.5 to >1.2 GPa. Core and clad glass compositions were As 40S 60 and As 38S 62, respectively.
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