CN113341520B - Central beam tube type large-core-number ribbon optical cable - Google Patents
Central beam tube type large-core-number ribbon optical cable Download PDFInfo
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- CN113341520B CN113341520B CN202110742567.6A CN202110742567A CN113341520B CN 113341520 B CN113341520 B CN 113341520B CN 202110742567 A CN202110742567 A CN 202110742567A CN 113341520 B CN113341520 B CN 113341520B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4403—Optical cables with ribbon structure
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/443—Protective covering
- G02B6/4432—Protective covering with fibre reinforcements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
- G02B6/4401—Optical cables
- G02B6/4429—Means specially adapted for strengthening or protecting the cables
- G02B6/44384—Means specially adapted for strengthening or protecting the cables the means comprising water blocking or hydrophobic materials
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- Optics & Photonics (AREA)
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- Communication Cables (AREA)
Abstract
The invention relates to a central beam tube type large-core-number ribbon optical cable which comprises an outer sheath and a cable core and is characterized in that the cable core is formed by overlapping optical fiber belts up and down, the cross section of the overlapped cable core is in a cross shape, a middle layer of the cable core is overlapped by 24 optical fiber belts into a cross horizontal line, the upper layer and the lower layer of the cable core are overlapped by 12 optical fiber belts into a cross vertical line, a flexible film tight sleeve layer is coated outside the cable core, a water-blocking layer is arranged outside the flexible film tight sleeve layer, and a circular-section outer sheath is coated outside the water-blocking layer. The optical cable has the advantages of simple and compact structure, small outer diameter, high optical fiber density, large core number and high optical fiber density, and meets the communication requirement of a large data center on high transmission number rate; the cable core of the cross-shaped array optical fiber belt enables the stress of the side fibers of the optical fiber belt to be reduced, the attenuation and damage of the optical fibers are avoided, meanwhile, the cable core of the cross-shaped array optical fiber belt is easy to twist, and the twisting performance is better.
Description
Technical Field
The invention relates to a central beam tube type large-core-number ribbon optical cable, belonging to the technical field of optical communication transmission.
Background
The existing central beam tube type optical fiber ribbon optical cable comprises a central beam tube and an outer sheath, wherein the central beam tube is internally coated with an optical fiber ribbon, the central beam tubes are of a circular structure, the optical fiber ribbon in the central beam tube is of a square or rectangular superposed structure, an optical fiber cable cross section structure with an inner circle and an outer circle is formed, the optical fiber ribbon optical cable of the structure is influenced by the width of the superposed square optical fiber ribbon, the content of optical fibers in the beam tube is not high, the utilization rate of space in the tube is low, the number of cores of the optical cable is limited, and the side fibers of the optical fiber ribbon positioned at four corners are easily extruded by the inner wall of the beam tube and stressed, so that the optical fiber attenuation is increased or even damaged. Because receive the restriction of central beam tube formula optical cable external diameter and structure, current access formula optical fiber ribbon optical cable is mostly little core number optical fiber ribbon, and total core number is little, is difficult to adapt to the communication demand of the big data center or the workstation of high transmission rate.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a central beam tube type large-core-number ribbon optical cable aiming at the defects of the prior art, which has the advantages of small outer diameter, high optical fiber density, large core number, reasonable overlapping structure of the optical fiber ribbon, small stress of side fibers and convenience in stripping and construction.
The technical scheme adopted by the invention for solving the problems is as follows: the cable core is formed by overlapping an optical fiber belt up and down, the cross section of the overlapped cable core is in a cross shape, a cable core middle layer is overlapped into a cross by a 24-core optical fiber belt, the upper layer and the lower layer of the cable core are overlapped into a cross vertical cross by a 12-core optical fiber belt, a flexible film tight sleeve layer is coated outside the cable core, a water blocking layer is arranged outside the flexible film tight sleeve layer, and a circular-section outer sheath is coated outside the water blocking layer.
According to the scheme, the cable core middle layer is formed by parallelly superposing 4-7 24-core optical fiber belts, and the upper layer and the lower layer of the cable core are respectively formed by parallelly superposing 5-7 12-core optical fiber belts.
According to the scheme, the cable core middle layer is formed by parallelly superposing 6 24-core optical fiber tapes, and the upper layer and the lower layer of the cable core are respectively formed by parallelly superposing 6 12-core optical fiber tapes.
According to the scheme, the nonmetal reinforcing parts are symmetrically embedded in the outer sheath.
According to the scheme, the flexible film tight-sleeved layer is a polyester flexible film tight-sleeved layer and consists of polyether hard segments and
the soft polyester segment constitutes block copolymer, and is extruded and molded through a pull-tube type tight sleeve, the maximum thickness of the tight sleeve layer is 0.30mm, the tear strength of the material is less than or equal to 60kN/m, and the elastic modulus is less than or equal to 17 MPa.
According to the scheme, the radial section of the flexible thin film tight sleeve layer is approximately regular octagon and is formed by alternately connecting 4 straight lines and 4 concave circular arcs, the tight sleeve layer and the optical fiber ribbon cable core are longitudinally in an S-shaped twisted shape, the twisted pitch is 450-600 mm, and the additional attenuation ATT1310/1550nm of the optical fiber after tight sleeve is less than 0.5 dB.
According to the scheme, the optical fiber ribbon is a water-blocking optical fiber ribbon and is coated with the secondary coating layer, the inner layer is a soft acrylic resin curing layer and is used for bonding semi-finished products of the optical fiber ribbon, the outer layer is a water-blocking coating layer which is formed by acrylic acid and water-blocking powder composite resin curing layer, the water-blocking coating layer can expand when meeting water and plays a role in buffering external force to a certain degree, and the unilateral thickness of the water-blocking coating layer is less than or equal to 20 microns.
According to the scheme, the outer sheath is formed by adopting a vacuum sizing process, the PET substrate cross-linked water-blocking tape longitudinal cladding is lined in the outer sheath, the thickness of the water-blocking tape is less than or equal to 0.10mm, the heat resistance of the water-blocking tape substrate is good, the water-blocking tape substrate is not compatible with the sheath, the sheath is not sticky when being peeled off, and water-blocking powder is filled in the space between the water-blocking tape and the flexible thin film tight-sleeving layer to form the water-blocking layer.
The invention has the beneficial effects that: 1. the optical cable has a simple and compact structure, a stacked cable core array structure of the cross optical fiber ribbons is more reasonable, the optical fiber array structure is configured with the round outer sheath, the outer diameter is small, the optical fiber density is high, the core number is large, and the communication requirement of a large data center on high transmission rate is met; 2. the number of contact points of the cross-shaped array optical fiber ribbon cable core and the inner wall of the circular outer sheath is 8, 4 more contact points are arranged compared with 4 contact points of the square optical fiber ribbon array cable core and the inner wall of the circular outer sheath, so that the stress of the optical fibers at the edges of the optical fiber ribbon is reduced, the optical fibers are prevented from being attenuated and damaged, meanwhile, the cross-shaped array optical fiber ribbon cable core is easy to twist, and the twisting performance is better; 3. the flexible film tight sleeve layer is adopted, so that the structure is simplified, the radial size is reduced, the shearing strength is low, the elasticity is good, manual tearing can be realized, and the bifurcation stripping is more convenient, so that the efficiency is further improved during laying construction; 4. the water-blocking optical fiber ribbon not only can improve the strength of the optical fiber ribbon, but also has better waterproof and moisture-proof capability after entering the indoor laying.
Drawings
FIG. 1 is a cross-sectional view of a radial cross-section of one embodiment of the present invention.
Fig. 2 is a cross-sectional block diagram of a water-blocking optical fiber ribbon in accordance with one embodiment of the present invention.
Fig. 3 is a schematic diagram of designing an X reference axis and a Y reference axis for arrangement of optical fiber ribbon cores.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
An embodiment of the invention is shown in fig. 1-3, and comprises an outer sheath 1 and a cable core, wherein the cable core is formed by overlapping an optical fiber ribbon 6 from top to bottom, the cross section of the overlapped cable core is in a cross shape, the middle layer of the cable core is formed by overlapping 6 24 optical fiber ribbons into a cross horizontal line, the upper layer and the lower layer of the cable core are respectively formed by overlapping 6 optical fiber ribbons with 12 cores into a cross vertical line, the maximum length of the cross horizontal line, namely the length of an X reference axis, is 5.37mm, the maximum length of the cross vertical line, namely the length of a Y reference axis, is 5.63mm, the optical fiber ribbon is a water-resistant optical fiber ribbon, the optical fiber ribbon comprises single-core optical fibers 8 which are arranged in parallel, the optical fibers can be bending insensitive G657A2 single-mode optical fibers, secondary coating layers are coated outside the single-core optical fibers which are arranged in parallel, the inner layer is a soft acrylic resin curing layer 10 for bonding the single-core optical fibers which are arranged in parallel to form a semi-finished product of the optical fiber ribbon, the outer layer is formed by a water-resistant coating layer 9 formed by a composite resin curing layer of acrylic acid and water-resistant powder, the waterproof coating layer can be expanded when meeting water and plays a role of buffering external force to a certain degree, and the thickness of a single side of the waterproof coating layer is 16 mu m. The flexible film tight sleeve layer 5 is coated outside the cross-shaped cable core, the flexible film tight sleeve layer is a polyester flexible film tight sleeve layer, a polyether hard section and a polyester soft section form a block copolymer, the block copolymer is formed by adopting a drawtube type tight sleeve in an extrusion molding mode, the thickness of the tight sleeve layer is 0.25mm, the tearing strength of the material is less than or equal to 60kN/m, the elastic modulus is less than or equal to 17MPa, the radial section of the flexible film tight sleeve layer is approximately regular octagonal and formed by alternately connecting 4 straight lines and 4 concave circular arcs, the tight sleeve layer and the optical fiber ribbon cable core are longitudinally in an S-shaped stranded shape, the stranded pitch is 450-600 mm, and the additional attenuation ATT1310/1550nm of the optical fiber after tight sleeve is less than 0.5 dB. The waterproof layer is arranged outside the flexible thin film tight sleeve layer, the round-section outer sheath 1 is coated outside the waterproof layer, the outer sheath is a low-smoke zero-halogen outer sheath, the outer sheath is formed by adopting a vacuum sizing process, the PET matrix cross-linked waterproof tape longitudinal covering layer 2 is arranged in the outer sheath, the thickness of the waterproof tape is 0.08mm, the heat resistance of the waterproof tape matrix is good, the waterproof tape is not compatible with the sheath, the sheath is not sticky when being peeled off, and the waterproof powder 3 is filled in a space between the waterproof tape and the flexible thin film tight sleeve layer, so that the waterproof layer is formed. The nonmetal reinforcing parts 4 with the circumferential interval of 90 degrees are symmetrically embedded in the outer sheath, each nonmetal reinforcing part is composed of aramid yarn or aramid rope, 2 pieces of the nonmetal reinforcing parts are arranged at each position, and the cable 7 can be arranged in the outer sheath for convenient stripping.
The cross-shaped optical fiber ribbon matrix cable core can be provided with a plurality of layout structures, wherein the length distribution of an X reference axis and a Y reference axis, the distribution condition of 264-288 optical fiber ribbons and the size of a tight sleeve layer are shown in table 1;
Claims (7)
1. a central beam tube type large-core-number ribbon optical cable comprises an outer sheath and a cable core, and is characterized in that the cable core is formed by vertically superposing optical fiber ribbons, the cross section of the superposed cable core is in a cross shape, a middle layer of the cable core is superposed by 24 optical fiber ribbons into a cross horizontal line, upper and lower layers of the cable core are superposed by 12 optical fiber ribbons into a cross vertical line, a flexible film tight sleeve layer is coated outside the cable core, a water-blocking layer is arranged outside the flexible film tight sleeve layer, and an outer sheath with a circular section is coated outside the water-blocking layer; the flexible film tight sleeve layer is a polyester flexible film tight sleeve layer, a block copolymer is formed by a polyether hard segment and a polyester soft segment, the maximum thickness of the tight sleeve layer is 0.30mm, the tearing strength of the material is less than or equal to 60kN/m, and the elastic modulus is less than or equal to 17 MPa; the radial section of the flexible film tight sleeve layer is approximately regular octagon and is formed by alternately connecting 4 straight lines and 4 concave circular arcs.
2. The central beam tube type ribbon optical cable with large core number according to claim 1, characterized in that the cable core middle layer is formed by overlapping 4-7 24-core optical fiber ribbons in parallel, and the upper layer and the lower layer of the cable core are respectively formed by overlapping 5-7 12-core optical fiber ribbons in parallel.
3. The central beam tube type ribbon optical cable with large core number according to claim 2, characterized in that the cable core middle layer is formed by overlapping 6 24-core optical fiber ribbons in parallel, and the upper layer and the lower layer of the cable core are respectively formed by overlapping 6 12-core optical fiber ribbons in parallel.
4. The central bundle, high core count ribbon cable of claim 1 or 2 wherein said outer jacket has non-metallic strength members symmetrically embedded therein.
5. The central beam tube type ribbon cable with large core number according to claim 1 or 2, characterized in that the tight sleeve layer and the optical fiber ribbon core are twisted in an S shape along the longitudinal direction, the twisting pitch is 450-600 mm, and the optical fiber additional attenuation ATT1310/1550nm after tight sleeve is less than 0.5 dB.
6. The central beam tube type ribbon optical cable with large core number as claimed in claim 1 or 2, wherein the optical fiber ribbon is a water-blocking optical fiber ribbon, and is coated with a secondary coating layer, the inner layer is a cured layer of soft acrylic resin for bonding the optical fiber ribbon semi-finished product, the outer layer is a water-blocking coating layer composed of a cured layer of acrylic and water-blocking powder composite resin, and is expandable in water and plays a role of buffering external force to a certain extent, and the thickness of one side of the water-blocking coating layer is less than or equal to 20 μm.
7. The central bundle tube type ribbon optical cable with large core number according to claim 1 or 2, characterized in that the outer sheath is formed by vacuum sizing process, the outer sheath is lined with PET matrix cross-linked water-blocking tape longitudinal cladding, the thickness of the water-blocking tape is less than or equal to 0.10mm, and the space between the water-blocking tape and the flexible thin film tight-jacketing layer is filled with water-blocking powder to form a water-blocking layer.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110607721 | 2021-06-01 | ||
| CN2021106077219 | 2021-06-01 |
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| Publication Number | Publication Date |
|---|---|
| CN113341520A CN113341520A (en) | 2021-09-03 |
| CN113341520B true CN113341520B (en) | 2022-03-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110742567.6A Active CN113341520B (en) | 2021-06-01 | 2021-07-01 | Central beam tube type large-core-number ribbon optical cable |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114114571A (en) * | 2021-11-23 | 2022-03-01 | 长飞光纤光缆股份有限公司 | Large-core-number butterfly optical cable for FTTX |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005070770A (en) * | 2003-08-04 | 2005-03-17 | Sumitomo Electric Ind Ltd | Optical fiber cable |
| CN2648464Y (en) * | 2003-09-09 | 2004-10-13 | 四川汇源光通信股份有限公司 | Combined fibre-optical with stacked light cable |
| US11567283B2 (en) * | 2019-02-11 | 2023-01-31 | Sterlite Technologies Limited | Optical fibre ribbon and optical fibre cables thereof |
| CN209690576U (en) * | 2019-04-26 | 2019-11-26 | 长飞光纤光缆股份有限公司 | A kind of high-density optical-fiber band layer-stranding cable |
| CN210465782U (en) * | 2019-05-28 | 2020-05-05 | 长飞光纤光缆股份有限公司 | Flexible optical fiber ribbon loose tube optical cable |
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| CN113341520A (en) | 2021-09-03 |
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Effective date of registration: 20220622 Address after: 430073 No.9, Guanggu Avenue, Donghu New Technology Development Zone, Wuhan City, Hubei Province Patentee after: YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK Ltd. Patentee after: Sichuan Lefei Photoelectric Technology Co., Ltd Address before: 430073 Optics Valley Avenue, East Lake New Technology Development Zone, Wuhan, Hubei, 9 Patentee before: YANGTZE OPTICAL FIBRE AND CABLE JOINT STOCK Ltd. |