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US 11,378,737 B2Granted
Optical fiber preform, method for manufacturing optical fiber preform, and method for setting striae pitch of optical fiber preform
AssigneeSumitomo Electric Industries, Ltd.
InventorsMasatoshi Hayakawa, Manabu Shiozaki
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Abstract
An optical fiber preform including a glass material and a refractive index adjusting additive is disclosed. This preform has striae due to difference in concentration of the additive and the striae have concentric refractive index periodicity in at least a part thereof from a radial center of the preform to an outer periphery thereof. The respective striae pitches each indicating a period of the refractive index periodicity increase from the center of the preform to the outer periphery thereof.
Claims10
An optical fiber preform comprising:
- a glass material and a refractive index adjusting additive,
- wherein the preform has striae due to difference in concentration of the additive, the striae have concentric refractive index periodicity in at least a part thereof from a radial center of the preform to an outer periphery thereof, and respective striae pitches each indicating a period of the refractive index periodicity increase from the center of the preform to the outer periphery thereof.
Dependencies are inferred from the claim text.