Optical fiber with smooth core refractive index profile and meth

Details Optical fiber with smooth core refractive index profile and meth Optical fiber with smooth core refractive index profile and meth

1996-11-07

1998-06-02

Healy, Brian

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

385123, 385124, 385126, 385142, 385144, 65385, 65415, G02B 602, C03B 37023

Patent

active

057613664

ABSTRACT:
A method of fabricating a dispersion shifted optical fiber with a smooth annular ring refractive index profile has the steps of heating a quartz tube with an external oxygen or hydrogen burner and supplying the quartz tube with raw materials including SiCl.sub.4, GeCl.sub.4, POCl.sub.3 and CF.sub.4. O.sub.2 is later supplied. Then, the quartz tube is heated in nine passes of decreasing temperature from 1920.degree. C. to 1890.degree. C., so as to deposit a core section. In the nine passes, the quantity of SiCl.sub.4 feed flow decreases from 380 milligrams per minute to 260 milligrams per minute, the quantity of GeCl.sub.4 feed flow increases from 20 milligrams per minute to 195 milligrams per minute, and the quantity of O.sub.2 feed flow is kept constant at 1500 cubic centimeters per minute.

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