CN115840274B - Optical ribbon cable - Google Patents
Optical ribbon cable Download PDFInfo
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- CN115840274B CN115840274B CN202310026667.8A CN202310026667A CN115840274B CN 115840274 B CN115840274 B CN 115840274B CN 202310026667 A CN202310026667 A CN 202310026667A CN 115840274 B CN115840274 B CN 115840274B
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Abstract
The application provides a band-shaped optical cable which comprises a loose tube, wherein an optical fiber ribbon and water blocking substances are filled in the loose tube, the periphery of the loose tube is circular, an inner cavity of the loose tube is in a regular polygon, and a first reinforcing piece is embedded into the tube wall of the loose tube at the vertex of the regular polygon. The inner cavity of the loose tube is provided with the regular polygon cavity, the edges and the corners of the regular polygon can effectively prevent the optical fiber ribbon in the loose tube from twisting and winding, and when the optical cable is subjected to external force, a buffer space is formed at the vertex of the inner cavity of the regular polygon of the loose tube, so that the extrusion of the edge fibers of the optical fiber ribbon is reduced, and the attenuation influence of the edge fibers of the optical fiber ribbon is reduced; meanwhile, the first reinforcing piece is arranged at the vertex of the regular polygon, so that deformation generated at the vertex of the regular polygon when the loose tube is extruded by the outside can be reduced, and the strength of the optical cable and the stability of the optical cable are further improved.
Description
Technical Field
The application relates to the technical field of optical cables, in particular to a ribbon optical cable.
Background
With the expansion of the coverage scale of the optical fiber into the home and the expansion of the network bandwidth, the demand of operators on the optical fiber cable is rapidly increased, and the resources of the urban underground pipe network for laying the optical cable are limited; the large-core number optical fiber ribbon cable well solves the contradiction because of the large fiber core number and small outer diameter, so that the demand of the large-core number optical fiber ribbon cable is rapidly increased.
However, since the existing loose tubes are all in a circular tube shape, the optical fiber ribbon with a rectangular overlapped section is put into the loose tube in the inner circle, and the optical fiber ribbon is loose in cooperation with the loose tube, the optical fiber ribbon is easy to turn over in the loose tube even when laid in the twisting process, so that the transmission performance of the optical fiber ribbon is attenuated and reduced; the loose tube is tightened, so that the turnover of the optical fiber ribbon can be avoided, and the phenomenon of side fiber attenuation can still occur due to the stress of the optical fiber ribbon, thereby influencing the transmission performance of the optical fiber and the cabling quality of the optical fiber ribbon.
In the prior art, in order to improve the strength of an optical cable, CN212460140U reduces the influence of the attenuation of the side fiber of an optical fiber ribbon, and designs a loose tube to be of an arc-shaped structure with a supporting structure and an hourglass cavity, so that the problem of side pressure of the optical fiber ribbon tangent to the loose tube is solved. However, the loose tube structure adopted in the prior art can lead to the increase of the diameter of the optical cable, which is unfavorable for meeting the requirements of both high filling rate and miniaturization.
Disclosure of Invention
The application aims to solve the problems in the prior art, and provides a band-shaped optical cable which comprises a loose tube, wherein the loose tube is provided with a regular polygon inner cavity, so that an optical fiber ribbon can be effectively prevented from overturning in the loose tube, the problem of reducing the attenuation exceeding standard of the side fiber of the optical fiber ribbon is simultaneously met, and the requirements of high optical cable filling rate and small diameter of the optical cable are met.
In a first aspect, an embodiment of the present application provides a ribbon-shaped optical cable, including an outer sheath, an inner sheath, a water-blocking tape, and a cable core, wherein the cable core is sequentially coated with the water-blocking tape, the inner sheath, and the outer sheath,
the inner protection layer is provided with strip-shaped protrusions towards the outer surface of the outer protection layer, the strip-shaped protrusions are distributed at intervals along the circumferential direction of the inner protection layer, the strip-shaped protrusions are of arc-shaped structures with thick bottoms and thin bottoms, the cross sections of the strip-shaped protrusions are in fan blade shapes, and the upper ends of the strip-shaped protrusions can be bent and deformed along an arc trend when being extruded, so that the pressure of external impact on the inside of the cable core is reduced;
the cable core comprises loose tube units and a central reinforcement, wherein the central reinforcement extends on the central axis of the optical cable, and the loose tube units are arranged around the central reinforcement;
the loose tube unit comprises a loose tube, the periphery of the loose tube is circular, the inner cavity of the loose tube is in a regular polygon shape, the number of edges of the inner cavity of the regular polygon of the loose tube is not less than 6, a first reinforcing piece is embedded into the tube wall of the loose tube at the vertex of the regular polygon, and the first reinforcing piece can reduce deformation generated at the vertex of the regular polygon when the loose tube is extruded by the outside.
In some embodiments, the strip-shaped protrusions are arranged in a straight line or a spiral extending along the axial direction of the optical cable, and the strip-shaped protrusions are uniformly distributed at intervals along the circumferential direction of the inner protecting layer.
In some embodiments, the first stiffener is flat or curved, and the first stiffener is a rigid material.
In some embodiments, at least one layer of optical fiber ribbon is stacked within the loose tube or at least one flexible optical fiber ribbon is wound.
In some embodiments, the loose tube is filled with a water-blocking substance, and the water-blocking substance comprises at least one of a fiber paste, a water-blocking yarn and a water-blocking powder.
In some embodiments, water blocking yarns are filled between the loose tube and the water blocking tape.
In some embodiments, the loose tube comprises at least one of polybutylene terephthalate (PBT), polycarbonate (PC), and thermoplastic elastomer rubber (TPEE).
Compared with the prior art, the application has the following beneficial effects:
1. according to the application, the periphery of the loose tube is circular, the inner cavity is in a regular polygon, the optical fiber ribbon is filled in the inner cavity, the optical fiber ribbon can be prevented from twisting and winding in the loose tube by the edges and corners of the polygon, and meanwhile, a slowing space is formed by the corner space of the regular polygon when the optical fiber ribbon is extruded from the outside, so that the problem of attenuation of the edge fiber is effectively solved; meanwhile, the first reinforcing piece is embedded in the pipe wall of the loose pipe at the vertex of the regular polygon, the first reinforcing piece can reduce deformation generated at the vertex of the regular polygon when the loose pipe is extruded externally, lateral pressure resistance and laying impact resistance of the loose pipe and the whole optical cable are improved, and the influence of external extrusion on the transmission performance of the optical fiber ribbon when the optical cable is laid is avoided.
2. Compared with the prior art, the first reinforcing piece is embedded in the pipe wall of the loose pipe, so that the design of a protection structure and a reinforcing structure with larger occupied volume is omitted, the diameter of an optical cable is reduced, and the filling rate of the optical fiber is improved under the same diameter;
3. the ribbon-shaped optical cable comprises an outer sheath, an inner sheath, a water-blocking tape and a cable core, wherein the cable core comprises a loose tube unit and a central reinforcing piece, the inner sheath is further arranged inside the outer sheath, and strip-shaped protrusions are arranged on the outer surface of the inner sheath, facing the outer sheath, of the inner sheath, so that the pressure of external impact on the optical fiber ribbon can be relieved, and the strength and lateral pressure resistance of the optical cable are improved.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1a shows a schematic view of a loose tube of a fiber optic ribbon cable according to the present application;
FIG. 1b shows a schematic diagram II of a loose tube of a fiber optic ribbon cable according to the present application;
FIG. 2a shows a schematic diagram III of a loose tube of a fiber optic ribbon cable in accordance with the present application;
FIG. 2b shows a schematic diagram of a loose tube of a fiber optic ribbon cable according to the present application;
FIG. 3 is a schematic view of a ribbon cable of the present application;
FIG. 4 is a schematic diagram of a second embodiment of a fiber optic ribbon cable of the present application;
FIG. 5a is a schematic illustration of an unpressurized fiber optic ribbon cable according to the present application;
fig. 5b shows a schematic view of a ribbon cable according to the present application when subjected to an external force.
In the figure: 10-loose tube units, 11-optical fiber ribbons, 12-water-blocking substances, 13-loose tubes, 14-first reinforcing members, 20-cable cores, 21-central reinforcing members, 30-water-blocking tape, 40-inner protective layers, 41-strip-shaped protrusions and 50-outer protective layers.
Detailed Description
The term "comprising" in the description of the application and in the claims and in the drawings is synonymous with "including", "containing" or "characterized by", and is inclusive or open-ended and does not exclude additional unrecited elements or method steps. "comprising" is a technical term used in claim language to mean that the recited element is present, but other elements may be added and still form a construct or method within the scope of the recited claims.
It should be noted that: like reference numerals and letters in the following figures denote like items, and thus once an item is defined in one figure, no further definition or explanation of it is required in the following figures, and furthermore, the terms "first," "second," "third," etc. are used merely to distinguish one description from another and are not to be construed as indicating or implying relative importance. The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. Those of skill in the art will explicitly and implicitly appreciate that the embodiments described herein may be combined with other embodiments.
The application will now be described in detail with reference to the accompanying drawings and specific examples.
Example 1
As shown in fig. 1a, the optical fiber ribbon cable of the present embodiment includes a plurality of loose tube units 10, the loose tube units 10 include loose tubes 13, and the loose tubes 13 are filled with at least one optical fiber ribbon 11 and a water blocking material 12. The outer surface of the loose tube 13 is cylindrical, the inner cavity is regular polygon, and the sides of the regular polygon in the inner cavity are not less than 6.
As in embodiment 1, the cavity is a regular hexagon, and at least one layer of optical fiber ribbon 11 is stacked in the regular hexagon cavity, for example, 1-12 layers of optical fiber ribbon may be stacked in the cavity of the loose tube 13 in some embodiments, etc.
Unlike available circular loose tube, the present application has regular polygon inner cavity, and the regular polygon has sides and corners capable of preventing the fiber ribbon 11 from twisting and winding inside the loose tube 13, and the outer extrusion has corner spaces in the top corners of the inside cavity to form retarding space, so as to avoid external force acting directly on the fiber ribbon and reduce the extrusion of the fiber ribbon side fiber, raise the compression resistance of the fiber cable, reduce the fiber ribbon side fiber attenuation and solve the side fiber attenuation problem effectively.
In this embodiment 1, the first reinforcement 14 is provided at the apex of the regular polygon, the first reinforcement 14 is embedded in the wall of the loose tube 13 provided at the apex of the regular polygon, and the first reinforcement 14 can reduce the deformation generated at the apex of the regular polygon when the loose tube is externally pressed. In this embodiment 1, by providing the first reinforcing member 14 at the outer corner of the loose tube that is being deformed, the deformation of the loose tube 13 at the vertex of the regular polygon when it is extruded from the outside is reduced, so as to further avoid the extrusion of the side fiber of the optical fiber ribbon 11, and prevent the serious attenuation of the inner and outer optical fibers of the loose tube when it is extruded from the outside, thereby solving the problem of exceeding the standard of the attenuation of the side fiber of the optical fiber ribbon 11.
The number of cores of the ribbon may be set according to different needs, for example, in some embodiments the ribbon may be 4-core, 6-core, 8-core, 10-core, 12-core, 24-core, etc. The optical fiber ribbons filled in the loose tube can also be stacked and combined by optical fiber ribbons with different core numbers.
The outer diameter of the loose tube varies depending on the outer diameter requirement of the cable and the fiber core number setting. For example, in some embodiments, 4 layers of 8-core optical fiber ribbons 11 are stacked within a loose tube, with the loose tube 13 having an outer diameter of 4.6mm.
The water blocking substance 12 filled in the loose tube comprises at least one of a fiber paste, a water blocking yarn or a water blocking powder. For example, each water blocking material may be filled alone, or may be a mixture of at least two of a fiber paste, a water blocking yarn, and a water blocking powder.
The first reinforcement 14 is a rigid material, preferably FRP, and is flat or arcuate.
In some embodiments, the sides of the inner cavity polygon of the loose tube 13 are larger than 6, as shown in fig. 1b, the regular polygon of the inner cavity of the loose tube 13 is a regular octagon, and the 6-core and 8-core optical fiber ribbons 11 are stacked simultaneously in the loose tube.
Example two
The optical fiber ribbon cable structure of this embodiment is different from that of embodiment 1 in that the optical fiber ribbon 11 filled in the loose tube 13 is a wound flexible optical fiber ribbon.
Specifically, as shown in FIG. 2a, at least one coiled flexible optical fiber ribbon is disposed within loose tube 13, and in some embodiments, for example, 1-12 coiled flexible optical fiber ribbons are disposed within loose tube 13, etc. A schematic of providing 4 coiled flexible optical fiber ribbons is shown in fig. 2 a. The optical fiber ribbon is wound in the inner cavity of the regular polygon of the loose tube, so that on one hand, the maximized inner cavity space of the loose tube is utilized, the filling rate of the optical fiber is improved, on the other hand, the stressed area of the optical fiber ribbon when the optical fiber ribbon is subjected to lateral pressure is increased, and the limit of external force which can be borne by the optical cable is improved to a certain extent.
In some embodiments, the first reinforcement 14 provided at the vertices of the inner cavity polygon of the loose tube 13 is arc-shaped, as shown in fig. 2b, and the inner cavity regular polygon of the loose tube 13 in fig. 2b is a regular octagon.
Example III
As shown in fig. 3, the present embodiment provides a ribbon cable comprising an outer jacket 50, an inner jacket 40, a water-blocking tape 30, and a cable core 20. The cable core is sequentially coated with a water-blocking tape 30, an inner protective layer 40 and an outer protective layer 50. The outer surface of the inner sheath 40 facing the outer sheath 50 is provided with a bar-shaped protrusion 41. The strip-shaped protrusions 41 are circumferentially spaced apart from the inner sheath 40, and have a trapezoid cross section, as shown in fig. 3, the strip-shaped protrusions have a narrow upper portion and a wide lower portion, and are trapezoidal in shape. The strip-shaped protrusions 41 can reduce the pressure of external impact to the inside of the cable core 20. The cable core 20 comprises a loose tube unit 10 and a central reinforcement 21. The central strength member 21 extends over the central axis of the cable, and the loose tube units 10 are arranged around the central strength member. The loose tube unit 10 includes a loose tube 13, which is the same as the "loose tube" described in embodiment 1, the outer circumference of the loose tube 13 is circular, the inner cavity is regular polygon, and a first reinforcement 14 is embedded in the wall of the loose tube at the vertex of the regular polygon, and the first reinforcement 14 can reduce the deformation generated at the vertex of the regular polygon when the loose tube 13 is extruded from the outside.
In this embodiment, the loose tube 13 has a circular shape, which can improve the efficiency and convenience of the twisting process of the loose tube, and the loose tube 13 has a regular polygon cavity, so as to solve the problem of attenuation of the side fiber of the optical fiber ribbon. The inner sheath 40 disposed within the outer sheath 50 provides support to increase cable strength and further to relieve the pressure of external impact on the ribbons 11 within the cable core 20.
In this embodiment, the water-blocking tape 30 is arranged outside the loose tube 13, and water-blocking yarns are filled between the loose tube 13 and the water-blocking tape 30, so that the optical cable has good water-blocking performance.
The loose tube 13 is made of one of PBT, PC and TPEE, for example, one single material can be used for molding the tube, a mixture of multiple materials can be used for molding the tube, and two materials can be used for molding the tube by double-layer co-extrusion process. The PBT material enables the loose tube to have better temperature characteristics, tensile strength and stability; the PC material has low shrinkage, so that the loose tube is not easy to deform and has good wear resistance; TPEE material has both the elasticity of rubber and the strength of engineering plastic, so that the loose tube has good bending property and strength.
In some embodiments, the strip-shaped protrusions 41 are linearly arranged along the axial direction of the optical cable in a linear extending manner, and are uniformly distributed at intervals, so that uniform stress can be applied to the strip-shaped protrusions, a better supporting effect is achieved, and meanwhile, the inner protection layer with the linear extending strip-shaped protrusions is convenient to form in production.
In some embodiments, the strip-shaped protrusions 41 are spirally arranged along the axial direction of the optical cable, so that no continuous groove exists on any single longitudinal surface of the optical cable, and when the optical cable is subjected to external force on a certain longitudinal surface, the protrusions are uniformly distributed at intervals on the longitudinal surface to bear the external force, so as to play a supporting role.
The optical fiber ribbon filled in the loose tube in this embodiment is at least one layer of optical fiber ribbon arranged in a stacked manner. In some embodiments, the optical fiber ribbon filled in the loose tube may be a coiled flexible optical fiber ribbon, as shown in fig. 4. The ribbon cable includes an outer jacket 50, an inner jacket 40, a water-blocking tape 30, and a cable core 20. The cable core is sequentially coated with a water-blocking tape 30, an inner protective layer 40 and an outer protective layer 50. The outer surface of the inner sheath 40 facing the outer sheath 50 is provided with a bar-shaped protrusion 41. The strip-shaped protrusions 41 are spaced apart along the circumferential direction of the inner sheath 40, and the strip-shaped protrusions 41 can reduce the pressure of external impact on the inside of the cable core 20. The cable core 20 comprises a loose tube unit 10 and a central reinforcement 21. The central strength member 21 extends over the central axis of the cable, and the loose tube units 10 are arranged around the central strength member. The loose tube unit 10 includes a loose tube 13, which is filled with a wound flexible optical fiber ribbon, in the same structure as the "loose tube" described in embodiment 1. In this embodiment, the loose tube is filled with 4 coiled flexible optical fiber ribbons, and in different embodiments, different numbers of flexible optical fiber ribbons may be filled as desired. The coiled flexible optical fiber ribbon is beneficial to the maximized utilization of the inner cavity space of the loose tube, improves the optical fiber filling rate, increases the stressed area of the optical fiber ribbon when the optical fiber ribbon is subjected to lateral pressure in a coiling mode, and improves the limit of the external force which can be borne by the optical cable to a certain extent.
Example IV
As shown in fig. 5a and 5b, the ribbon cable structure of the present embodiment is different from that of the third embodiment in that the strip-shaped protrusion 41 of the inner sheath 40 has a circular arc shape with a thick bottom and a thin top, and the cross section is in the shape of a fan blade, and the upper end of the strip-shaped protrusion can be deformed when being extruded.
When not subjected to external force, the strip-shaped protrusions 41 of the inner protective layer 40 remain unchanged, the contact area between the upper ends of the strip-shaped protrusions and the outer protective layer is minimum, and the space between the strip-shaped protrusions and the outer protective layer is not compressed. When the inner sheath 40 is pressed by an external force, the strip-shaped protrusions 41 of the inner sheath 40 are deformed in such a manner that the thinner upper ends of the strip-shaped protrusions are bent in an arc trend, the contact area between the upper ends of the strip-shaped protrusions and the outer sheath is increased, and the space between the strip-shaped protrusions and the outer sheath is compressed, as shown in fig. 5 b. The deformation of the upper end of the strip-shaped bulge absorbs external extrusion force, so that the inner protection layer plays a supporting role and can buffer the impact of external force on the cable core 20, and the stability of the optical cable is further improved.
The foregoing has outlined rather broadly the more detailed description of embodiments of the application, wherein the principles and embodiments of the application are explained in detail using specific examples, the above examples being provided solely to facilitate the understanding of the method and core concepts of the application; meanwhile, as those skilled in the art will have variations in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (7)
1. A ribbon optical cable comprises an outer sheath, an inner sheath, a water-blocking tape and a cable core, wherein the cable core is sequentially coated with the water-blocking tape, the inner sheath and the outer sheath,
the inner protection layer is provided with strip-shaped protrusions towards the outer surface of the outer protection layer, the strip-shaped protrusions are distributed at intervals along the circumferential direction of the inner protection layer, the strip-shaped protrusions are of arc-shaped structures with thick bottoms and thin bottoms, the cross sections of the strip-shaped protrusions are in fan blade shapes, and the upper ends of the strip-shaped protrusions can be bent and deformed along an arc trend when being extruded, so that the pressure of external impact on the inside of the cable core is reduced;
the cable core comprises loose tube units and a central reinforcement, wherein the central reinforcement extends on the central axis of the optical cable, and the loose tube units are arranged around the central reinforcement;
the loose tube unit comprises a loose tube, the periphery of the loose tube is circular, the inner cavity of the loose tube is in a regular polygon shape, the number of edges of the inner cavity of the regular polygon of the loose tube is not less than 6, a first reinforcing piece is embedded into the tube wall of the loose tube at the vertex of the regular polygon, and the first reinforcing piece can reduce deformation generated at the vertex of the regular polygon when the loose tube is extruded by the outside.
2. A ribbon fiber cable according to claim 1 wherein the strip-shaped projections are arranged in a straight or spiral extending arrangement along the axial direction of the cable, the strip-shaped projections being evenly spaced along the circumference of the inner jacket.
3. A fiber optic ribbon cable as claimed in claim 1, wherein the first strength member is flat or curved and the first strength member is a rigid material.
4. A fiber optic ribbon cable as claimed in claim 1, wherein at least one layer of optical fiber ribbon is stacked or at least one flexible optical fiber ribbon is wound within the loose tube.
5. A fiber optic ribbon cable as claimed in claim 1, wherein the loose tube is filled with a water-blocking substance comprising at least one of a fiber paste, a water-blocking yarn, and a water-blocking powder.
6. A fiber optic ribbon cable as claimed in claim 1, wherein water blocking yarns are filled between the loose tube and the water blocking tape.
7. A fiber optic ribbon cable as claimed in claim 1, wherein the loose tube comprises at least one of polybutylene terephthalate (PBT), polycarbonate (PC) and thermoplastic elastomer rubber (TPEE).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310026667.8A CN115840274B (en) | 2023-01-09 | 2023-01-09 | Optical ribbon cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310026667.8A CN115840274B (en) | 2023-01-09 | 2023-01-09 | Optical ribbon cable |
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| CN115840274A CN115840274A (en) | 2023-03-24 |
| CN115840274B true CN115840274B (en) | 2023-09-22 |
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| CN202310026667.8A Active CN115840274B (en) | 2023-01-09 | 2023-01-09 | Optical ribbon cable |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117215015A (en) * | 2023-11-07 | 2023-12-12 | 江苏中天科技股份有限公司 | Underwater optical cable |
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| 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 |
| CN114217395A (en) * | 2021-12-08 | 2022-03-22 | 通鼎互联信息股份有限公司 | High-tensile-resistance optical cable |
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| US6870995B2 (en) * | 2001-07-05 | 2005-03-22 | Pirelli Cables And Systems Llc | High fiber count optical fiber cable with buffer tubes around central strength member |
| US9086556B2 (en) * | 2013-02-12 | 2015-07-21 | Nexans | Fiber optic cable with improved flexibility, low temperature and compression resistance |
| US9459422B2 (en) * | 2013-06-28 | 2016-10-04 | Corning Optical Communications LLC | Coupling system for a fiber optic cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1278071A (en) * | 1999-06-18 | 2000-12-27 | 阿尔卡塔尔公司 | Thick wall optical cable shell having non-circular cavity cross section |
| CN2508257Y (en) * | 2001-12-05 | 2002-08-28 | 长飞光纤光缆有限公司 | Loose sleeve layer strand optic fibre band optic cable |
| CN101458373A (en) * | 2008-11-17 | 2009-06-17 | 江苏永鼎股份有限公司 | Polygon arranged central tube type optical fiber ribbon cable |
| CN204009177U (en) * | 2014-08-22 | 2014-12-10 | 长飞光纤光缆四川有限公司 | Four parallel reinforcements of a kind of dry type are without bushing type optical fibre band optical cable |
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| CN115840274A (en) | 2023-03-24 |
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