Title:
LOW LOSS FIBER OPTIC COUPLER AND MANUFACTURE THEREOF
Document Type and Number:
Japanese Patent JPS6240404
Kind Code:
A
Abstract:
A low loss fiber optic coupler is fabricated by forming a coupler preform having a plurality of spaced glass cores extending longitudinally through a matrix of glass having a refractive index lower than that of the cores. The coupler preform is formed by inserting a plurality of coated optical fiber preform rods (26,27,28) into an aperture (20) extending axially through an elongated boule (21) of relatively etchable matrix glass. The cladding portion (35) of the rods, which is relatively etch-resistant, is coated with a layer of etchable glass (36). The coupler preform is heated and stretched to form a glass rod (43) which is then severed into a plurality of units (45; 49). Heat is applied to the central region (66) of each unit, and the central region is elongated and tapered inwardly. When an end of the unit is immersed in acid, the matrix glass dissolves, thereby leaving the unit cores and surrounding etch-resistant cladding glass protruding from the newly formed endface of the unit.
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Inventors:
JIYOOJI EDOWAADO BAAKII
Application Number:
JP18972486A
Publication Date:
February 21, 1987
Filing Date:
August 14, 1986
Export Citation:
Assignee:
CORNING GLASS WORKS
International Classes:
C03B23/047; C03B37/012; C03B37/025; C03B37/14; G02B6/28; (IPC1-7): G02B6/28
Attorney, Agent or Firm:
Toshihito Yamamoto
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