Patent ID: 7807595

Claim:
An arsenic sulfide glass made by a process comprising: placing arsenic monosulfide in a glass receptacle; distilling under vacuum the arsenic monosulfide to make purified arsenic monosulfide; homogenizing the purified arsenic monosulfide; adding sulfur to the purified arsenic mono sulfide; distilling under vacuum in an open distillation system the purified arsenic monosulfide with the sulfur to form distilled arsenic monosulfide and sulfur; sealing the open distillation system; and reacting and homogenizing the distilled arsenic monosulfide and sulfur to form the arsenic sulfide glass; wherein the molar concentration of arsenic and sulfur varies from As 7 S 93 to As 40 S 60 ; wherein the glass is in the form of a fiber; and wherein the fiber consists of arsenic, sulfur, and optionally, one or more of germanium, antimony, indium, chlorine, bromine, fluorine, and iodine; wherein the optical loss of the arsenic sulfide glass is about 30 dB/km or lower at 2.55 μm.