CN207663109U - The counter-bending high fiber count cable of City Access Network - Google Patents
The counter-bending high fiber count cable of City Access Network Download PDFInfo
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- CN207663109U CN207663109U CN201721472384.2U CN201721472384U CN207663109U CN 207663109 U CN207663109 U CN 207663109U CN 201721472384 U CN201721472384 U CN 201721472384U CN 207663109 U CN207663109 U CN 207663109U
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Abstract
The utility model discloses a kind of City Access Network counter-bending high fiber count cables, including cable outer sheath, and the buffer layer being located in cable outer sheath, and at least a stiffener and a tear rope are equipped between cable outer sheath and buffer layer；The cable core formed by several optical fiber is coated in buffer layer, and be made of through adhesive strip bonding several optical fiber can wound optical fibers unit, by by it is multiple can wound optical fibers unit twist together, be respectively formed multilayer cable core, optical fiber space accounting rate is gradually reduced from outside to inside in the multilayer cable core.By using the fibre ribbon that can be wound, the bonding of discontinuous will be carried out between multiple optical fiber, and the space accounting for controlling optical fiber in cable core gradually reduces from inside to outside, to improve the bending property of optical cable.
Description
Technical field
The utility model is related to fiber optic cable manufacture technical fields, are related to a kind of counter-bending high fiber count cable of City Access Network.
Background technology
In recent years, with the improvement of living standards, demand of more and more families to network is also towards high-speed, great Rong
The direction of amount is developed, and the demand of FTTH (fiber entering household) is continuously increased, and virtually also increases the demand to optical fiber, therefore more next
More high fiber count cables also gradually uses in City Access Network, to meet user to growing data demand.But
Domestic current high fiber count cable is mostly layer-stranding cable, is usually 12 cores or 24 core parallel optical fiber ribbons, such optical cable in casing
The shortcomings that be that structure size is larger, optical cable weight weight, bending property are poor, laid in limited pipeline space especially in city,
The structure of parallel optical fiber ribbon limits the bending of optical fiber, and transmission performance may be caused unstable.
Utility model content
To solve drawbacks described above existing in the prior art, the purpose of this utility model is to provide a kind of City Access Networks
The bonding of discontinuous will be carried out between multiple fibre ribbons by using the fibre ribbon that can be wound with counter-bending high fiber count cable, and
The space accounting of optical fiber gradually reduces from inside to outside in control cable core, to improve the bending property of optical cable.
The utility model is realized by following technical proposals.
A kind of City Access Network counter-bending high fiber count cable, including cable outer sheath, and be located in cable outer sheath
Buffer layer, at least a stiffener and a tear rope are equipped between cable outer sheath and buffer layer；In buffer layer
Be coated with the cable core formed by several optical fiber, and by several optical fiber through adhesive strip bonding constitute can wound optical fibers unit, pass through
By it is multiple can wound optical fibers unit twisted together according to different interlayer tension stringings, be respectively formed multilayer cable core, the multilayer
Optical fiber space accounting rate is gradually reduced from outside to inside in cable core.
Preferably, optical fiber space accounting rate is the area of section of all optical fiber and is coated on its outer layer in the multilayer cable core
The ratio of the area of section of annular；By to adjacent interlayer in multilayer cable core can wound optical fibers unit laying tension adjustment, make
Adjacent interlayer can wound optical fibers unit laying tension difference be 2N~3N, with the increase of tension, optical fiber space accounting rate is gradually
Reduce, changes the space accounting rate of each layer optical fiber with this.
Preferably, when the outer layer cable core is decremented to 5~6% with optical fiber space accounting rate in internal layer cable core, it is bent big core
When number optical cable, the additional attenuation of cable inner fiber is not more than 0.05dB/km.
Preferably, the buffer layer longitudinal wrap is on the outside of cable core, and at least a tear rope is close to along buffer layer outer layer, reinforces structure
Part is equally distributed between cable outer sheath and buffer layer.
Preferably, it is described can wound optical fibers unit be interrupted staggeredly by adhesive strip by the optical fiber of several parallelly distribute ons
The combination of fiber-optic formed after the bonding of formula and superposition.
Preferably, it is that adjacent fiber is bonded using adhesive strip according to equidistantly distributed that the interruption alternating expression, which is pasted, adjacent
The outer adjacent optical fiber of optical fiber is Nian Jie according to being interspersed with the adhesive strip of adjacent fiber, and its spacing distribution is bonding with adjacent fiber
Stripe pitch is equal.
Preferably, the multilayer cable core by it is multiple can wound optical fibers unit according to optical fiber accounting rate decreasing fashion from outside to inside
It is placed on inner layer optical fiber unit pay off rack, it is internal layer circumscribed circle diameter that outer diameter is formed after interior helical layer stranding device is twisted
Cable core internal layer；Cable core internal layer again on outer layer fiber unit pay off rack can wound optical fibers unit twisted through outer helical layer stranding device
The cable core that outer diameter is the external diameter of a circle of outer layer is formed after conjunction, and so on, form multilayer cable core.
Preferably, the cable outer sheath is constituted slow using the composite band of polyester fiber, aramid fiber or PP fibers composition
Eat up part of blanket.
Preferably, a steel wire messenger wire is further connected on the cable outer sheath.
The beneficial effects of the utility model are：
1) optical fibre in optical cable replaces Traditional parallel fibre ribbon using the fibre ribbon that can be wound, and will be carried out between multiple fibre ribbons
The bonding of discontinuous, such fibre ribbon is due to its special bonding way, it may be convenient to winding together, make optical fiber have compared with
Big degree of freedom.Optical cable is when being bent, the fibre ribbon stress in cable, due to using convoluted fibre ribbon, structure can be with
It suffered power to be changed, makes optical fiber that will avoid by excessive power, to improve the bending property of optical cable.
2) optical cable core by bilayer or multilayer can wound optical fibers band form, by by fibre ribbon spiral it is twisted after sequentially form
Internal layer and outer layer, and one layer of padded coaming is wrapped up in the outside of outer layer, prolonging outside padded coaming axially placed has 2 tear ropes
With 2 reinforcements, stress performance when optical cable bending is improved.
3) cushioning materials being surrounded by the outside of the cable core of fibre ribbon composition, performance when increasing optical cable bending.
4) accounting of optical fiber gradually reduces from inside to outside in cable core, and the space shared by each layer of optical fiber of optical cable core is by interior
To incrementally increasing outside, the space between outer layer optical fiber is more advantageous to moving freely for optical fiber relative to internal layer, when optical cable is bent by
When power, since the space of from-inner-to-outer optical fiber incrementally increases, enough spaces are provided for optical fiber movement for the movement of optical fiber.
5) since optical fiber does not have casing, buffer layer that can protect optical fiber, ensure the mechanical performances such as the flattening of optical cable.
6) cable configuration size is small, light-weight.
7) laying tension of fibre ribbon can be adjusted according to the difference of the cable core number of plies, it is ensured that space size is suitable, improves optical cable
Bending property.
Description of the drawings
Fig. 1 is the utility model high fiber count cable structural schematic diagram；
Fig. 2 is the banded structure schematic diagram of optical fiber；
Fig. 3 is the schematic diagram after fiber unit folds；
Fig. 4 is optical cable core, is twisted schematic diagram；
Fig. 5 (a) is the sectional view of A-A in Fig. 4；
Fig. 5 (b) is the sectional view of B-B in Fig. 4；
Fig. 6 is the schematic diagram of the utility model embodiment 2；
Fig. 7 is the schematic diagram of the utility model embodiment 3.
In figure：1 is optical cable, and 2 be optical fiber, and 2a is optical fiber one, and 2b is optical fiber two, and 2c is optical fiber three, and 2d is optical fiber four, and 3 are
Cable core internal layer, 4 be internal layer circumscribed circle, and 5 be tear rope, 6 for can wound optical fibers unit, 7 be stiffener, and 8 be buffer layer, and 9 are
Outer layer of cable core, 10 be cable outer sheath, and 11 be adhesive strip, and 12 be inner layer optical fiber unit pay off rack, and 13 be the twisted dress of interior helical layer
It sets, 14 be outer layer fiber unit pay off rack, and 15 be outer helical layer stranding device, and 16 be outer layer circumscribed circle, and 17 be middle level circumscribed circle,
18 be cable core middle level, and 19 be steel wire messenger wire.
Specific implementation mode
The utility model is described in further detail with reference to the accompanying drawings and examples, but is not intended as to this practicality
The novel foundation for doing any restrictions.
As shown in Figure 1, for the sectional view of optical cable 1, the City Access Network of the utility model is adopted with counter-bending high fiber count cable
Traditional layer-twisted type structure, including cable outer sheath 10 are replaced with new construction, the buffer layer 8 being located in cable outer sheath 10,
An at least stiffener 7 between optical cable outer jacket 1 and buffer layer 8 and a tear rope 5；Be coated in buffer layer 8 by
Several optical fiber 2 formed cable core, and certain amount optical fiber 2 composition can wound optical fibers unit 6, by winding light by multiple
Fine unit 6 is twisted together according to different interlayer tension stringings, is respectively formed cable core internal layer 3, outer layer of cable core 9,8 longitudinal wrap of buffer layer
On the outside of cable core.
It is positioned axially there are two symmetrical reinforcer 7 in 1 both sides of optical cable in order to enhance the mechanical performance of optical cable, reinforce
Component 7 is equally distributed between cable outer sheath 10 and buffer layer 8.In addition, for the ease of optical cable baring, in buffer layer outer axis
To symmetrically placed tear rope 5, tear rope 5 is close to along 8 outer layer of buffer layer, and one layer of oversheath 10 is finally extruded outside cable core.Outside
The purpose of sheath 10 is to cover and protect optical cable 1, while stiffener 7 and tear rope 5 being wrapped up wherein.It can wound optical fibers list
Member 6 is usually two layers or multilayered structure, and as shown in the sectional view of optical cable 1, internal layer circumscribed circle 4 is to discriminate between cable core internal layer 3 and cable
One of core outer layer 9 mark the number of optical fiber can be not limited only to the structure in figure in wound optical fibers unit 6, but each layer is extremely
It less will be there are one can wound optical fibers unit 6.Can wound optical fibers unit 6 it is mutually independent winding together, separately constitute in cable core
Layer 3 and outer layer of cable core 9.And the distance between optical fiber is bigger than the distance between optical fiber in cable core internal layer 3 in outer layer of cable core 9.Therefore,
Compared with cable core internal layer 3, the optical fiber in outer layer of cable core 9 has better degree of freedom.In order to ensure that optical fiber 2 can be certainly in each layer
By moving, using can takeup type fibre ribbon, by bonding together for 2 discontinuous of multifiber.
The distance between optical fiber size is defined as follows by can be indicated by optical fiber space accounting rate in cable core：3 institute of cable core internal layer
There is the ratio of the area of section of optical fiber and the area of section of internal layer circumscribed circle 4 (to be known as inner layer optical fiber space accounting rate, range is preferably
60%~68%), the area of section of all optical fiber and the area ratio in entire outer annular section (are known as outer layer in outer layer of cable core 9
Optical fiber space accounting rate, range are preferably 45%~50%).
As shown in Fig. 2, being the banded structure schematic diagram of optical fiber 2, wherein by one 2a of optical fiber, the optical fiber of four parallelly distribute ons
Two 2b, three 2c of optical fiber, four 2d of optical fiber, which bond together, collectively constitutes the banded structure of optical fiber 2, i.e. that is mentioned in Fig. 1 winds light
Fine unit 6.Number of fibers in fibre ribbon is not limited only to number of fibers shown in figure.One 2a of optical fiber, two 2b of optical fiber, optical fiber three
2c, four 2d of optical fiber put together at a certain distance, and the bonding of interruption alternating expression is carried out using adhesive strip 11, adjacent in this way
Multifiber just bonds together.It is that adjacent fiber is viscous according to equidistantly distributed using adhesive strip 11 to be interrupted alternating expression to paste
Connect, the outer adjacent optical fiber of adjacent fiber is Nian Jie according to being interspersed with the adhesive strip 11 of adjacent fiber, and its spacing be distributed with it is adjacent
11 spacing of adhesive strip of optical fiber is equal.Due to being bonded using discontinuous, the optical fiber in the part not being bonded can be in light
What one 2a of fibre, two 2b of optical fiber, three 2c of optical fiber, four 2d of optical fiber were constituted can be overlapped on wound optical fibers unit 6, and between optical fiber mutually
Parallel distribution.Be illustrated in figure 3 can wound optical fibers unit 6 fold after schematic diagram.Based on the above reason, optical fiber 2 has larger
Degree of freedom.
Can wound optical fibers unit 6 needs twist together, formed optical cable core, stranding method is as shown in figure 4, by that can roll up
Cable core internal layer 3 and outer layer of cable core 9 have been separately constituted around fiber unit 6.
Fig. 5 (a) is the sectional view of A-A in Fig. 4, cable core internal layer 3 by with some tension can 6 groups of wound optical fibers unit
At, as shown in figure 4, can wound optical fibers unit 6 be placed on inner layer optical fiber unit pay off rack 12, pass through interior helical layer stranding device
Cable core internal layer 3 is formed after 13, outer diameter is the diameter of internal layer circumscribed circle 4.Fig. 5 (b) is the sectional view of B-B in Fig. 4, cable core internal layer 3
With on outer layer fiber unit pay off rack 14 can wound optical fibers unit 6, by forming entire cable after outer helical layer stranding device 15
Core, outer diameter are the diameter of outer layer circumscribed circle 16.By control every layer can the laying tension of wound optical fibers unit 6 control each layer
Optical fiber space accounting rate requires optical fiber accounting in outer layer of cable core 9 to be accounted for less than optical fiber space in cable core internal layer 3 in process of production
Than.Based on the above reason, the optical fiber 2 in outer layer of cable core 9 is easy movement, when optical cable 1 is bent, even if optical cable stress, leads
It causes optic fibre force to incrementally increase, since optical fiber can move freely, there is certain cushioning effect to bending force.
Fig. 6 is 2 schematic diagram of optical cable embodiment, similar to the structure of optical cable 1, therefore repetitive description is omitted in figure,
Including optical fiber 2 and can wound optical fibers unit 6 is omitted.Optical fiber second embodiment 2 and optical cable 1 are the difference is that embodiment 2
It is a three-decker.That is, fiber unit is arranged in order three layers from center to outside, cable core internal layer 3 is in the internal layer
The inside of circumscribed circle 4, and cable core middle level 18 is the inside of middle level circumscribed circle 17, and remove cable core inner portion.Outer layer of cable core 9 is
Inside buffer layer, and remove the part of internal layer and middle layer.In this case, the optical fiber accounting of middle level optical fiber 2 is less than interior
The optical fiber space accounting of layer, the optical fiber space accounting of outer layer optical fiber are less than the optical fiber space accounting of middle level optical fiber, that is to say, that from
Interior and outer, optical fiber space accounting is gradually reduced.By using pair can wound optical fibers unit 6 use different laying tensions, ensure
Rational optical fiber space accounting in each layer, additional attenuation unobvious when making fibre-optical bending.By to adjacent layer in multilayer cable core
Between can 6 laying tension of wound optical fibers unit adjustment so that adjacent interlayer can 6 laying tension difference of wound optical fibers unit be 2N~
3N, with the increase of tension, optical fiber space accounting rate gradually reduces, and changes the space accounting rate of each layer optical fiber with this.According to
Embodiment 2 can obtain effect identical with optical cable 1.Therefore, in the utility model can wound optical fibers unit 6 the number of plies not by
Limitation, is determined by the fiber number needed.
Fig. 7 is 3 schematic diagram of embodiment, identical as embodiment 1 optical cable, 1 basic structure, the difference is that providing steel wire
Messenger wire 19, optical cable are self-support cable.Equally, the optical fiber space accounting of each layer is also gradually to subtract from the inner to the outer in the optical cable
It is small, in embodiment 3, can the number of plies of wound optical fibers unit 6 be not limited to shown example.
In optical cable production process, optical fiber internal layer by 2 20 cores can wound optical fibers unit 6 form, fiber outer layer is by 4
20 cores wind the composition of light unit 6, and the fiber unit of each layer is being twisted together with certain laying tension, will buffered
Material is wrapped on the outside of cable core, while the steel wire of tear rope and φ 0.7mm is axially placed, finally extrudes one layer of shield in outside
Set, cable outer diameter 12mm.
Optical fiber internal layer by 2 20 cores can wound optical fibers unit 6 form, optical fiber middle level can wound optical fibers by 4 20 cores
Unit 6 forms, fiber outer layer by 8 20 cores can wound optical fibers unit 6 form, the fiber unit of each layer is being put with certain
Line tension twists together, and padded coaming is wrapped on the outside of cable core, while the steel wire of tear rope and φ 0.7mm axially being put
It sets, one layer of sheath, cable outer diameter 23mm is extruded in outside.
The accounting of each layer optical fiber and corresponding additional attenuation value are as shown in table 1 below in the optical cable of two above specification：
No. 1 and No. 2 be two layers of fiber unit structure optical cable, No. 3 and No. 4 be three floor fiber unit structure optical cable, No. 1
Optical fibre in optical cable space accounting ectonexine is 52%, and the inside and outside sheaf space accounting of No. 2 optical fibre in optical cable is respectively 65% He
50%, No. 3 optical fibre in optical cable space accountings are 50% by internal layer to outer layer, and No. 4 optical fibre in optical cable space accountings are from inside to outside
Respectively 68%, 52%, 46%.And be bent according to certain bending diameter, wherein using No. 1 of the double-deck fiber unit and
No. 2 optical cables are bent with the curvature diameter of φ 320mm and φ 160mm respectively, using No. 3 and No. 4 light of three floor fiber unit
Cable is bent with φ 480mm and φ 240mm curvature diameters respectively.It is by upper table it can be seen that bigger in bending diameter
When, the equal unobvious of optical fiber additional attenuation, when optical cable bending diameter is smaller, the optical fiber in the outer layer of serial number 1 and serial number 3 generates
Obvious additional attenuation.And in serial number 2 and serial number 4, each layer of optical fiber is without apparent additional attenuation.According to conclusions, into one
When step is demonstrated from cable core internal layer to outer layer of cable core, the space accounting of optical fiber gradually reduces, and the bending property of optical fiber is more preferable.
The utility model is not limited to above-described embodiment, on the basis of technical solution disclosed by the utility model, this
For the technical staff in field according to disclosed technology contents, not needing performing creative labour can be special to some of which technology
Sign makes some and replaces and deform, these are replaced and deformation is within the protection scope of the present utility model.
Claims (9)
1. the counter-bending high fiber count cable of City Access Network, including cable outer sheath (10), and it is located at cable outer sheath (10)
Interior buffer layer (8), which is characterized in that an at least stiffener is equipped between cable outer sheath (10) and buffer layer (8)
(7) and a tear rope (5)；It is coated with the cable core formed by several optical fiber (2) in buffer layer (8), and by several optical fiber
(2) through adhesive strip (11) bonding constitute can wound optical fibers unit (6), by by it is multiple can wound optical fibers unit (6) according to difference
Inter-laminar tension unwrapping wire twists together, and is respectively formed multilayer cable core, and optical fiber space accounting rate is from outside to inside in the multilayer cable core
It is gradually reduced.
2. the counter-bending high fiber count cable of City Access Network according to claim 1, which is characterized in that the multilayer cable core
Middle optical fiber space accounting rate is the area of section of all optical fiber and is coated on the ratio of the area of section of its outer annular；
By to adjacent interlayer in multilayer cable core can wound optical fibers unit (6) laying tension adjustment so that adjacent interlayer can be rolled up
It is 2N~3N around fiber unit (6) laying tension difference, with the increase of tension, optical fiber space accounting rate gradually reduces, and is come with this
Change the space accounting rate of each layer optical fiber.
3. the counter-bending high fiber count cable of City Access Network according to claim 1, which is characterized in that the multilayer cable core
When middle outer layer cable core is decremented to 5~6% with optical fiber space accounting rate in internal layer cable core, when being bent high fiber count cable, light in optical cable
Fine additional attenuation is not more than 0.05dB/km.
4. the counter-bending high fiber count cable of City Access Network according to claim 1, which is characterized in that the buffer layer
(8) longitudinal wrap is on the outside of cable core, and at least a tear rope (5) is close to along buffer layer (8) outer layer, and stiffener (7) is equally distributed on
Between cable outer sheath (10) and buffer layer (8).
5. the counter-bending high fiber count cable of City Access Network according to claim 1, which is characterized in that described to wind light
Fine unit (6) is to be carried out the bonding for being interrupted alternating expression by adhesive strip (11) by the optical fiber of several parallelly distribute ons and formed after superposition
Combination of fiber-optic.
6. the counter-bending high fiber count cable of City Access Network according to claim 5, which is characterized in that the interruption is interlocked
It is that adjacent fiber is bonded using adhesive strip (11) according to equidistantly distributed that formula, which is pasted, the outer adjacent optical fiber and adjacent fiber of adjacent fiber
Adhesive strip (11) according to be interspersed bonding, and its spacing distribution it is equal with adhesive strip (11) spacing of adjacent fiber.
7. the counter-bending high fiber count cable of City Access Network according to claim 1, which is characterized in that the multilayer cable core
By it is multiple can wound optical fibers unit (6) be placed on inner layer optical fiber unit pay off rack (12), through interior helical layer stranding device (13)
The cable core internal layer (3) that outer diameter is internal layer circumscribed circle (4) diameter is formed after twisted；Cable core internal layer (3) is put with outer layer fiber unit again
On coil holder (14) can wound optical fibers unit (6) composition outer diameter after outer helical layer stranding device (15) is twisted be outer layer circumscribed circle
(16) cable core of diameter, and so on, form multilayer cable core.
8. the counter-bending high fiber count cable of City Access Network according to claim 1, which is characterized in that protected outside the optical cable
(10) are covered using the composite band of polyester fiber, aramid fiber or PP fibers composition, constitute cushioning materials.
9. the counter-bending high fiber count cable of City Access Network according to claim 1, which is characterized in that protected outside the optical cable
It is further connected with a steel wire messenger wire (19) on set (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721472384.2U CN207663109U (en) | 2017-11-07 | 2017-11-07 | The counter-bending high fiber count cable of City Access Network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721472384.2U CN207663109U (en) | 2017-11-07 | 2017-11-07 | The counter-bending high fiber count cable of City Access Network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207663109U true CN207663109U (en) | 2018-07-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721472384.2U Expired - Fee Related CN207663109U (en) | 2017-11-07 | 2017-11-07 | The counter-bending high fiber count cable of City Access Network |
Country Status (1)
| Country | Link |
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| CN (1) | CN207663109U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643574A (en) * | 2017-11-07 | 2018-01-30 | 西安西古光通信有限公司 | A kind of counter-bending high fiber count cable of City Access Network |
| CN113325532A (en) * | 2021-05-25 | 2021-08-31 | 长飞光纤光缆股份有限公司 | Layer-stranded optical fiber ribbon cable and production process |
-
2017
- 2017-11-07 CN CN201721472384.2U patent/CN207663109U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107643574A (en) * | 2017-11-07 | 2018-01-30 | 西安西古光通信有限公司 | A kind of counter-bending high fiber count cable of City Access Network |
| CN113325532A (en) * | 2021-05-25 | 2021-08-31 | 长飞光纤光缆股份有限公司 | Layer-stranded optical fiber ribbon cable and production process |
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| CF01 | Termination of patent right due to non-payment of annual fee |