Single-mode infrared fibers based on Te-As-Se glass system

Core-clad single-mode optical fibers based on high-purity Te-As-Se glasses prepared by chemical and physical methods of purification have been drawn. The "buildin casting" and "rod-in-tube" techniques were used to form the high ratio of core/cladding diameters. The minimal optical losses measured by cut-back method were 0.33 dB/m at 7.5 (mu)m for Te-As-Se glass fiber with core diameter of 20 (mu)m and cladding diameter of 450 (mu)m. The optical losses in the spectral range between 9 and 11 (mu)m were equal to 1-3 dB/m.