Optical fiber preform, optical fiber, and method of manufacturing optical fiber
US-2017285259-A1 · Oct 5, 2017 · US
Optical fiber, method for manufacturing optical fiber, and optical fiber preform
US11168015B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-11168015-B2 |
| Application number | US-201816498585-A |
| Country | US |
| Kind code | B2 |
| Filing date | Apr 3, 2018 |
| Priority date | May 30, 2017 |
| Publication date | Nov 9, 2021 |
| Grant date | Nov 9, 2021 |
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Abstract
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An optical fiber includes: a core; and a cladding layer disposed on an outer circumference of the core. A Cl concentration in the cladding layer is 0.029 wt % to 0.098 wt %. In the optical fiber, Δ2−Δ1≤0 dB/km is satisfied at a wavelength of 430 nm where Δ1 is a value of transmission loss before exposure of the optical fiber to hydrogen and Δ2 is a value of transmission loss after the exposure.
First claim
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What is claimed is: 1. An optical fiber comprising: a core; and a cladding layer disposed on an outer circumference of the core, wherein the core is formed of silicon dioxide that does not contain germanium, the cladding layer includes an inner cladding layer and an outer cladding layer disposed outside of the inner cladding layer, a refractive index of the outer cladding layer is higher than a refractive index of the inner cladding layer, an average Cl concentration distribution across a cross section of the cladding layer is 0.029 wt% to 0.098 wt%, and Δ2−Δ1<0 dB/km is satisfied at a wavelength of 430 nm, where Δ1 is a value of transmission loss before exposure of the optical fiber to hydrogen and Δ2 is a value of transmission loss after the exposure to pure hydrogen for at least 15 hours. 2. The optical fiber according to claim 1 , wherein Δ2−Δ1 ≤0.005 dB/km is satisfied at a wavelength of 1550 nm, where Δ1 is a value of transmission loss before exposure of the optical fiber to hydrogen and Δ2 is a value of transmission loss after the exposure to pure hydrogen for at least 15 hours. 3. The optical fiber according to claim 1 , wherein an OH group concentration in the cladding layer is less than or equal to 10 ppm. 4. A method for manufacturing an optical fiber including a core and a cladding layer disposed on an outer circumference of the core, the method comprising: dehydrating the cladding layer with Cl-containing gas such that a Cl concentration in the cladding layer is 0.029 wt% to 0.098 wt%, wherein the core is formed of silicon dioxide that does not contain germanium, the cladding layer includes an inner cladding layer and an outer cladding layer disposed outside of the inner cladding layer, a refractive index of the outer cladding layer is higher than a refractive index of the inner cladding layer, the cladding layer is dehydrated with the Cl-containing gas such that an average Cl concentration distribution across a cross section of the cladding layer is 0.029 wt% to 0.098 wt%, and Δ2−Δ1<0 dB/km is satisfied at a wavelength of 430 nm, where Δ1 is a value of transmission loss before exposure of the optical fiber to hydrogen and Δ2 is a value of transmission loss after the exposure to pure hydrogen for at least 15 hours. 5. The method according to claim 4 , wherein the cladding layer is dehydrated with a mixed gas comprising a Cl-containing gas and an F-containing gas. 6. An optical fiber preform for manufacturing an optical fiber including a core and a cladding layer disposed on an outer circumference of the core, wherein the core is formed of silicon dioxide that does not contain germanium, the cladding layer includes an inner cladding layer and an outer cladding layer disposed outside of the inner cladding layer, a refractive index of the outer cladding layer is higher than a refractive index of the inner cladding layer, a soot that forms the cladding layer includes Cl, an average Cl concentration distribution across a cross section of the cladding layer formed by the soot is 0.029 wt% to 0.098 wt%, and Δ2−Δ1<0 dB/km is satisfied at a wavelength of 430 nm, where Δ1 is a value of transmission loss before exposure of the optical fiber to hydrogen and Δ2 is a value of transmission loss after the exposure to pure hydrogen for at least 15 hours.
Assignees
Inventors
Classifications
- C03B37/01853Primary
Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering · CPC title
Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties · CPC title
doped with fluorine (C03B2201/14 takes precedence) · CPC title
- C03B37/01446Primary
Thermal after-treatment of preforms, e.g. dehydrating, consolidating, sintering (C03B37/01853 takes precedence) · CPC title
Hydroxyl ion (OH) · CPC title
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Frequently asked questions
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- What does patent US11168015B2 cover?
- An optical fiber includes: a core; and a cladding layer disposed on an outer circumference of the core. A Cl concentration in the cladding layer is 0.029 wt % to 0.098 wt %. In the optical fiber, Δ2−Δ1≤0 dB/km is satisfied at a wavelength of 430 nm where Δ1 is a value of transmission loss before exposure of the optical fiber to hydrogen and Δ2 is a value of transmission loss after the exposure.
- Who is the assignee on this patent?
- Fujikura Ltd
- What technology area does this patent fall under?
- Primary CPC classification C03B37/01853. Mapped technology areas include Chemistry & Metallurgy.
- When was this patent published?
- Publication date Tue Nov 09 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 5 related publications on this page (citations in our corpus or others sharing the same primary CPC).