Optical fiber cable
US-2021271042-A1 · Sep 2, 2021 · US
Optical fiber cable and optical fiber unit
US12313894B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-12313894-B2 |
| Application number | US-202118003400-A |
| Country | US |
| Kind code | B2 |
| Filing date | Oct 29, 2021 |
| Priority date | Oct 30, 2020 |
| Publication date | May 27, 2025 |
| Grant date | May 27, 2025 |
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- Title
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Abstract
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An optical fiber cable includes a plurality of optical fibers, a plurality of water-absorbent fibers, and a sheath covering a periphery of the plurality of optical fibers and the plurality of water-absorbent fibers. A ratio of areas of the water-absorbent fibers to an area of an accommodating portion in an inner side of the sheath in a cross section orthogonal to a longitudinal direction of the optical fiber cable is 1% or more and 5% or less, and a maximum value of an area of a gap portion surrounded by the optical fibers in the cross section is 1.0 mm 2 or less.
First claim
Opening claim text (preview).
What is claimed is: 1. An optical fiber cable comprising: a plurality of optical fibers; a plurality of water-absorbent fibers; and a sheath covering a periphery of the plurality of optical fibers and the plurality of water-absorbent fibers, wherein a ratio of areas of the water-absorbent fibers to an area of an accommodating portion in an inner side of the sheath in a cross section orthogonal to a longitudinal direction of the optical fiber cable is 1% or more and 5% or less, and a maximum value of an area of a gap portion surrounded by the optical fibers in the cross section is 1.0 mm 2 or less, wherein an internal porosity obtained by dividing an internal gap area, which is obtained by subtracting areas of the plurality of optical fibers in the cross section from an area of the accommodating portion in the inner side of the sheath in the cross section, by the area of the accommodating portion is 30% or more and 50% or less, and wherein each of the optical fibers has an outer diameter of 220 μm or less. 2. The optical fiber cable according to claim 1 , wherein each of the water-absorbent fibers has a fineness of 5000 d or less. 3. The optical fiber cable according to claim 1 , further comprising: a lid covering a periphery of the plurality of optical fibers and the plurality of water-absorbent fibers, wherein the lid is disposed between the sheath and the plurality of optical fibers and between the sheath and the plurality of water-absorbent fibers, wherein the lid has a water absorption property. 4. The optical fiber cable according to claim 1 , further comprising: a first lid covering a periphery of a part of the plurality of optical fibers; and a second lid covering a periphery of the other part of the plurality of optical fibers which are arranged outside the first lid, wherein the first lid and the second lid have a water absorption property. 5. The optical fiber cable according to claim 4 , wherein the other part of the plurality of optical fibers is located between the first lid and the second lid. 6. An optical fiber unit comprising: a plurality of optical fibers; a plurality of water-absorbent fibers; and a coating portion covering a periphery of the plurality of optical fibers and the plurality of water-absorbent fibers, wherein a ratio of areas of the water-absorbent fibers to an area of an accommodating portion in an inner side of the coating portion in a cross section orthogonal to a longitudinal direction of the optical fiber unit is 1% or more and 5% or less, and a maximum value of an area of a gap portion surrounded by the optical fibers in the cross section is 1.0 mm 2 or less, wherein an internal porosity obtained by dividing an internal gap area, which is obtained by subtracting areas of the plurality of optical fibers in the cross section from an area of the accommodating portion in the inner side of the sheath in the cross section, by the area of the accommodating portion is 30% or more and 50% or less, and wherein each of the optical fibers has an outer diameter of 220 μm or less.
Assignees
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Classifications
- G02B6/4403Primary
with ribbon structure (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title
built up from sub-bundles (G02B6/4429, G02B6/4439, G02B6/4479 take precedence) · CPC title
- G02B6/44384Primary
the means comprising water blocking or hydrophobic materials (G02B6/4439, G02B6/4479 take precedence) · CPC title
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- What does patent US12313894B2 cover?
- An optical fiber cable includes a plurality of optical fibers, a plurality of water-absorbent fibers, and a sheath covering a periphery of the plurality of optical fibers and the plurality of water-absorbent fibers. A ratio of areas of the water-absorbent fibers to an area of an accommodating portion in an inner side of the sheath in a cross section orthogonal to a longitudinal direction of the…
- Who is the assignee on this patent?
- Sumitomo Electric Industries
- What technology area does this patent fall under?
- Primary CPC classification G02B6/4403. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue May 27 2025 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 6 related publications on this page (citations in our corpus or others sharing the same primary CPC).