Optical fiber, method of making optical fiber preform, and...

Details Optical fiber, method of making optical fiber preform, and... Optical fiber, method of making optical fiber preform, and...

2005-05-10

2005-05-10

Duverne, J. F. (Department: 2839)

Optical waveguides

Optical fiber waveguide with cladding

Utilizing multiple core or cladding

Reexamination Certificate

active

06892019

ABSTRACT:
An optical fiber comprising a core region100doped with Cl which raises the refractive index; and a cladding region200, provided at the outer periphery of the core region100, having a cladding layer201doped with F which lowers the refractive index is formed. The cladding region201to become the outermost cladding layer is configured such that the doping amount of F successively decreases within an outer peripheral part205including the outer periphery thereof to a predetermined doping amount which is the minimum doping amount of F within the cladding layer201. Therefore, the stress within the optical fiber is dispersed into the outer peripheral part205having an enhanced viscosity, whereby the stress concentration into the core is suppressed. Since the favorable tension range at the time of drawing the optical fiber becomes wider at this time, tension control is facilitated.

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