PRODUCTION OF BASE MATERIAL FOR OPTICAL WAVEGUIDE

摘要

PURPOSE:To permit the formation of waveguide films having a small light transmission loss at a high growing speed and to make integral formation of the waveguide films and circuit by depositing and forming a quartz glass layer on the surface of plural pieces of quartz glass base bodies and vitrifying the same to transparent glass then combining the glass base bodies and melting the same by which optical refractive indices are obtd. CONSTITUTION:The quartz porous glass layer for only the core or for the core and clad is deposited and formed by an OVD method on the surfaces of the glass base bodies 1a-1d and the porous glass layer is subjected to a heating treatment by which said layer is vitrified to the transparent glass. The glass base plates 1a-1d are inserted into a quartz tube 3 and are bound together. The respective glass base bodies 1a-1d and the quartz tube are melted and united by heating by which a base material 4 for an optical waveguide is obtd. The base material 4 is reduced by heating and stretching to a prescribed diameter and is sliced to form leaves 3. The leaves 5 are optically polished on one face and a quartz leaf 6 is stuck thereto. A quartz leaf 7 is stuck thereto after optical polishing. The leaves 5 sandwiched between the two quartz leaves 6, 7 are ground to expose the waveguide part by which the optical waveguide 8 is obtd.