Single mode fibre and method of making

Details Single mode fibre and method of making Single mode fibre and method of making

1980-10-29

1982-06-22

Fisher, Richard V.

Coating processes

Electrical product produced

Integrated circuit, printed circuit, or circuit board

65 312, 350 9634, 427163, G02B 5172, C03B 37075

Patent

active

043359345

ABSTRACT:
Single mode optical fibre for operation in the wavelength range 1.5 to 1.7 microns is made by depositing a cladding glass layer and then a core glass layer upon the bore of a silica substrate tube. The bore of the coated tube is then collapsed to form a solid cross-section optical fibre preform. The cladding glass has an index matching that of silica and either contains no oxide of phosphorus or the minimal amount to provide a low enough deposition temperature and high enough deposition rate to provide an acceptably low diffusion of hydroxyl groups from the material of the substrate tube. Optionally the deposition of the cladding may be preceded by the deposition of a diffusion barrier layer which may contain a higher proportion of oxide of phosphorus.

REFERENCES:
patent: 4009014 (1977-02-01), Black et al.
patent: 4045198 (1977-08-01), Rau et al.
patent: 4106850 (1978-08-01), Marcatili
Ainslie et al.; "Preparation of Long Lengths Of Ultra-Low-Loss Single Mode Fiber"; Electronic Letters, vol. 15, No. 14, Jul. 5, 1979; pp. 411-413.

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