Fig. 1. Thermal expansion curves of glass samples and relationship between glass transition temperature and mole fraction of iodine in glass. (a) Thermal expansion curves of (GeSe2)100-xIx; (b) relationship between mole fraction of iodine in (GeSe2)100-xIx and glass transition temperature; (c) thermal expansion curves of (GeSe3)100-xIx; (d) relationship between mole fraction of iodine in (GeSe3)100-xIx and glass transition temperature

Fig. 2. Refractive index of glass samples. (a) (GeSe2)100-xIx; (b) (GeSe3)100-xIx

Fig. 3. Dispersion curves of glass samples. (a) (GeSe2)100-xIx; (b) (GeSe3)100-xIx

Fig. 4. Near-infrared transmission spectra and absorption spectra of glass samples. (a) Transmission spectra of (GeSe2)100-xIx; (b) absorption spectra of (GeSe2)100-xIx; (c) transmission spectra of (GeSe3)100-xIx; (d) absorption spectra of (GeSe3)100-xIx

Fig. 5. Optical gap of glass samples and relationship between optical gap and contents of iodine. (a) (GeSe2)100-xIx; (b) (GeSe3)100-xIx

Fig. 6. Mid-infrared transmission spectra of glass samples. (a) (GeSe2)100-xIx; (b) (GeSe3)100-xIx

Fig. 7. Mid-infrared transmission spectra of glass before and after purification

Fig. 8. Fiber loss spectra and fiber end view

Table 1. Components and parameters of glass samples