PRODUCTION OF GLASS FIBER FOR LIGHT TRANSMISSION

摘要

PURPOSE:To produce the title stable fiber with a low transmission loss and a small signal strain by setting a specified transparent glass body around a transparent glass body having a predetermined dopant concn. distribution. CONSTITUTION:A dopant for charging a refractive index is deposited on the inner surfaces of the pores of porous glass, and the glass is collapsed to form glass rod 31. Rod 31 is placed in glass tube 32 made of borosilicate glass or aluminosilicate glass, and one end is thoroughly melted and sealed. While exhausting 33 air in the space between tube 32 and rod 31, tube 32 and rod 31 are heated with heater 34 from the sealed side and melt-spun to obtain glass fiber 35 covered with borosilicate glass or aluminosilicate glass.