Optical Fiber, Optical Fiber Preform and Method of Fabricating Same
AssigneeShin-Etsu Chemical Co., Ltd.
InventorsHiroshi Oyamada, Tetsuya Otosaka
Life of this patent
Estimating the term…
Abstract
An optical fiber capable of suppressing an increase of a transmission loss after exposure of the optical fiber to hydrogen or deuterium is provided. The optical fiber has a core region, an inner cladding region surrounding the core region, a trench region surrounding the inner cladding region, an outer cladding region surrounding the trench region, and a refractive index varying region arranged between the inner cladding region and the trench region, the refractive index varying region having a refractive index gradually increasing from the trench region to the inner cladding region.
Claims20
An optical fiber comprising:
- a core region;
- an inner cladding region surrounding the core region;
- a trench region surrounding the inner cladding region;
- an outer cladding region surrounding the trench region;
- and
- a refractive index varying region arranged between the inner cladding region and the trench region, and having a refractive index gradually increasing from the trench region to the inner cladding region.
An optical fiber preform, comprising:
- a core region;
- an inner cladding region surrounding the core region;
- a trench region surrounding the inner cladding region;
- an outer cladding region surrounding the trench region;
- and
- a refractive index varying region arranged between the inner cladding region and the trench region, and having a refractive index gradually increasing from the trench region to the inner cladding region.
A method of fabricating an optical fiber preform, the optical fiber preform having a core region, an inner cladding region surrounding the core region, a trench region surrounding the inner cladding region, and an outer cladding region surrounding the trench region, comprising a step of:
- forming the trench region on an outer periphery surface of a core member having the core region and the inner cladding region;
- the step of forming the trench region including,
- forming a refractive index varying region arranged between the inner cladding region and the trench region, and having a refractive index gradually increasing from the trench region to the inner cladding region.
Dependencies are inferred from the claim text.