Single-mode optical cable

Abstract

The utility model discloses a single-mode optical cable which comprises a protective sleeve, a waterproof layer is arranged on the circumferential inner wall of the protective sleeve, a reinforcing layer is arranged on the circumferential inner wall of the waterproof layer, a buffer layer is arranged on the circumferential inner wall of the reinforcing layer, a loose sleeve layer is arranged on the circumferential inner wall of the buffer layer, and a fiber core is inserted in the circumferential inner wall of the loose sleeve layer. A composite structure of a corrugated loose sleeve layer and an elastic buffer layer is adopted, thermal expansion difference stress is absorbed through axial deformation of a corrugated loose sleeve, and meanwhile, the interlayer displacement synchronization rate is increased through the design that skewed slots formed in the circumferential inner wall of the buffer layer are matched with corrugations on the circumferential outer wall of the loose sleeve layer in an engaged mode; metal fixing pieces such as metal rings are replaced by the spirally distributed nonmetal reinforcing ribs, and the corrugated protective sleeve is matched, so that the tensile and compressive strength of the optical fiber is enhanced, the weight is lower than that of a metal piece, the outer diameter of the optical cable is reduced, and the wiring density is improved.

Description

Technical Field

[0001] This utility model relates to the field of optical cable technology, specifically a single-mode optical cable. Background Technology

[0002] Optical fiber is short for optical waveguide fiber. It is a type of fiber made of glass or plastic that can be used as a light transmission tool. The transmission principle is "total internal reflection of light".

[0003] The prior art patent document CN220399695U provides an armored single-mode optical cable, including an outer sheath, an armor layer, a support mechanism, and optical fibers. The armor layer is located inside the outer sheath, and an inner sheath is installed inside the armor layer. A shock-absorbing layer is located inside the inner sheath, and an optical fiber is inserted through the middle of the shock-absorbing layer. Fixing components are installed on the surface of the support mechanism, and the bottom of the support mechanism passes downwards from the surface of the outer sheath. The armored single-mode optical cable is attached to the inner armor layer and the support mechanism is installed on the outside of the support mechanism via multiple connecting rods. Because the connecting rods are made of rigid metal rods, the overall tensile strength of the optical cable can be significantly improved by pulling the multiple connecting rods together without affecting the winding effect, thus ensuring portability during transportation. The support mechanism and the mounting ring work together to improve the overall pressure resistance of the optical cable.

[0004] Although the device has many beneficial effects, it still has the following problems: there is a certain difference in the thermal expansion coefficient between the metal components and the optical fiber core. When the temperature changes over a long period of time, the metal components generate axial stress, which leads to micro-bending loss of the optical fiber. Secondly, the metal components result in a large weight and large diameter of the optical cable, making it difficult to adapt to high-density cabling scenarios. Utility Model Content

[0005] The purpose of this section is to outline some aspects of the embodiments of this utility model and to briefly introduce some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be used to limit the scope of this utility model.

[0006] 1. Technical problems to be solved:

[0007] To address the issues of thermal stress mismatch and mass-volume contradiction mentioned above, this utility model is proposed.

[0008] Therefore, the purpose of this utility model is to provide a single-mode optical cable that adopts a composite structure of a corrugated loose tube layer and an elastic buffer layer. The axial deformation of the corrugated loose tube absorbs the thermal expansion stress. At the same time, the inclined grooves opened on the inner circumference of the buffer layer, combined with the corrugated interlocking design on the outer circumference of the loose tube layer, increase the interlayer displacement synchronization rate. In addition, the spirally distributed non-metallic reinforcing ribs replace metal rings and other metal fasteners, and the corrugated protective sleeve enhances the tensile and compressive strength of the optical fiber. It is lighter than metal parts, reduces the outer diameter of the optical cable, and increases the wiring density.

[0009] 2. Technical Solution:

[0010] To solve the above-mentioned technical problems, according to one aspect of the present invention, the present invention provides the following technical solution:

[0011] A single-mode optical cable includes a protective sleeve, a waterproof layer on the inner circumference of the protective sleeve, a reinforcing layer on the inner circumference of the waterproof layer, a buffer layer on the inner circumference of the reinforcing layer, a loose tube layer on the inner circumference of the buffer layer, and a fiber core inserted into the inner circumference of the loose tube layer.

[0012] In a preferred embodiment of the single-mode optical cable of this utility model, the protective sleeve includes an inner sheath, an outer sheath is bonded to the outer circumferential wall of the inner sheath, and the outer sheath has a wavy structure.

[0013] In a preferred embodiment of the single-mode optical cable of this utility model, the waterproof layer includes a water-blocking tape, the outer circumferential wall of the water-blocking tape is coated with water-blocking paste, and the outer circumferential wall of the water-blocking paste is tightly attached with a reinforcing film.

[0014] In a preferred embodiment of the single-mode optical cable of this utility model, the reinforcing layer includes reinforcing ribs, and a braided tape is tightly attached to the outer circumference of the reinforcing ribs. The braided tape, in conjunction with the reinforcing ribs, enhances the compressive strength of the optical fiber while limiting and fixing the reinforcing ribs. The reinforcing ribs and the braided tape are arranged in an interlaced spiral structure.

[0015] As a preferred embodiment of the single-mode optical cable of this utility model, the inner circumference of the buffer layer is provided with multiple inclined grooves, the angle of the inclined grooves is 45 degrees. While the inclined grooves limit and fix the loose tube layer, they also disperse concentrated stress and improve radial pressure absorption force through multi-point contact.

[0016] As a preferred embodiment of the single-mode optical cable of this utility model, the loose tube layer has a wavy structure, and the wavy protrusions of the loose tube layer correspond to the inclined grooves of the buffer layer. The wavy structure of the loose tube layer facilitates the elastic deformation of the loose tube layer due to thermal expansion, while mechanically buffering the stress transmission between the fiber core and the external structure.

[0017] In a preferred embodiment of the single-mode optical cable of this utility model, the reinforcing rib is cylindrical and the cross-section of the braided tape is rectangular.

[0018] 3. Beneficial effects:

[0019] Compared with the prior art, the beneficial effects of this utility model are:

[0020] This type of single-mode optical cable adopts a composite structure of corrugated loose tube layer and elastic buffer layer. It absorbs thermal expansion stress through the axial deformation of corrugated loose tube. At the same time, the interlayer displacement synchronization rate is increased by the inclined groove opened on the inner wall of the buffer layer and the corrugated interlocking design on the outer wall of the loose tube layer.

[0021] This type of single-mode optical cable uses spirally distributed non-metallic reinforcing ribs to replace metal rings and other metal fasteners, and is combined with a corrugated protective sleeve to enhance the tensile and compressive strength of the optical fiber. It is lighter than metal parts, reduces the outer diameter of the optical cable, and increases the wiring density. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of this utility model, the present utility model will be described in detail below with reference to the accompanying drawings and detailed embodiments. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:

[0023] Figure 1 This is a schematic diagram of the overall structure of a single-mode optical cable according to the present invention;

[0024] Figure 2 This is a schematic diagram of the protective sleeve structure for a single-mode optical cable according to the present invention;

[0025] Figure 3 This is a schematic diagram of the waterproof layer structure of a single-mode optical cable according to the present invention;

[0026] Figure 4 This is a schematic diagram of the reinforcing layer structure of a single-mode optical cable according to the present invention;

[0027] Figure 5 This is a partial cross-sectional view of the buffer layer and loose tube layer of a single-mode optical cable according to this utility model.

[0028] The numbers in the diagram are explained as follows: 100, protective sleeve; 110, outer sleeve; 120, inner sleeve; 200, waterproof layer; 210, reinforcing membrane; 220, water-blocking paste; 230, water-blocking tape; 300, reinforcing layer; 310, reinforcing rib; 320, braided tape; 400, buffer layer; 500, loose sleeve layer; 600, fiber core. Detailed Implementation

[0029] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.

[0030] This utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not be construed as limiting the scope of protection of this utility model. In actual manufacturing, the three-dimensional spatial dimensions of length, width, and depth should be included.

[0031] The orientation or positional relationship indicated in the terminology is based on the orientation or positional relationship shown in the accompanying drawings and is only for the convenience of describing the present invention and simplifying the description. It is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0032] The term "connection method" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0033] The embodiments of this utility model will now be described in further detail with reference to the accompanying drawings.

[0034] This utility model provides an overall structural schematic diagram of one embodiment of a single-mode optical cable, including:

[0035] Please see Figures 1-5 A single-mode optical cable according to this embodiment includes a protective sleeve 100, a waterproof layer 200 bonded to the inner circumference of the protective sleeve 100, a reinforcing layer 300 bonded to the inner circumference of the waterproof layer 200, a buffer layer 400 bonded to the inner circumference of the reinforcing layer 300, a loose tube layer 500 bonded to the inner circumference of the buffer layer 400, and a fiber core 600 inserted into the inner circumference of the loose tube layer 500.

[0036] It is worth noting that, in order to reduce the weight and improve the pressure resistance of the protective sleeve 100, the protective sleeve 100 specifically includes an inner sleeve 120. The inner sleeve 120 is made of high-density polyethylene mixed with glass microspheres. The inner sleeve 120 is used to improve the inner pressure resistance of the protective sleeve 100 and is lighter than the traditional solid sleeve. An outer sleeve 110 is bonded to the outer circumference of the inner sleeve 120. The outer sleeve 110 is made of high-density polyethylene and has a wavy structure. The wavy structure effectively improves the lateral pressure resistance of the protective sleeve 100 and enhances the mechanical strength of the bending parts.

[0037] Next, to ensure the waterproofness of the optical fiber, the waterproof layer 200 specifically includes a water-blocking tape 230, which is an ultra-thin water-blocking yarn. The outer circumference of the water-blocking tape 230 is coated with a water-blocking paste 220, which is a thixotropic silicone grease. A reinforcing film 210, which is a graphene-modified polyester film, is tightly attached to the outer circumference of the water-blocking paste 220. At the same time, multiple micropores are opened on the surface of the reinforcing film 210 to improve the puncture resistance of the waterproof layer 200 and release the shrinkage stress of the protective sleeve 100 through the micropores.

[0038] Meanwhile, to enhance the compressive and tensile strength of layer 300, specifically, layer 300 includes reinforcing ribs 310 made of polyaramid fiber, which replaces metal components for protection and fixation, reducing the weight of the optical fiber. A braided tape 320 is tightly attached to the outer circumference of the reinforcing ribs 310. The braided tape 320 is made of carbon fiber. The reinforcing ribs 310 and the braided tape 320 have an interlaced spiral distribution structure, which not only improves the compressive and tensile strength, but also allows the braided tape 320 to limit the reinforcing ribs 310 and prevent the reinforcing ribs 310 from shifting between layers.

[0039] Furthermore, to facilitate the limiting and fixing of the buffer layer 400 and the loose sleeve layer 500, specifically, the buffer layer 400 is made of nano-silica modified foamed silicone. Multiple inclined grooves are opened on the inner circumference of the buffer layer 400, with an angle of 45 degrees. The inclined grooves disperse the concentrated stress and limit and fix the loose sleeve layer 500 to avoid interlayer displacement.

[0040] It is worth noting that, in order to facilitate the thermal expansion of the loose sleeve layer 500, specifically, the loose sleeve layer 500 is made of polybutylene terephthalate and has a wavy structure to facilitate the thermal expansion of the loose sleeve layer 500 and at the same time buffer the stress transmission of the external structure. The wavy protrusions of the loose sleeve layer 500 correspond to the positions of the inclined grooves of the buffer layer 400, and the inclined grooves work together to achieve mechanical interlocking.

[0041] Finally, to improve the compressive strength of the reinforcing layer 300, specifically, the reinforcing rib 310 has a cylindrical structure to enhance its supporting compressive strength, and the braided tape 320 has a rectangular cross-section to facilitate contact with the reinforcing rib 310 and the waterproof layer 200.

[0042] In addition, the circuits, electronic components and modules involved in this utility model are all existing technologies, which can be fully implemented by those skilled in the art, and need not be elaborated upon. The content protected by this utility model does not involve any improvement to the internal structure and method.

[0043] Combination Figures 1-5 The specific usage process of a single-mode optical cable according to this embodiment is as follows:

[0044] 1: After the single-mode fiber is installed, the protective sleeve 100 provides external protection for the fiber core 600, the waterproof layer 200 is used to prevent water penetration and avoid water contact with the fiber core 600, and the buffer layer 400 is used to buffer external pressure and reduce the damage of external impact pressure to the fiber core 600. At the same time, the non-solid protective sleeve 100 and the non-metallic reinforcing layer 300 reduce the weight and volume of the fiber and increase the fiber cabling density.

[0045] 2: When the internal temperature of the optical fiber reaches a certain level, the fiber core 600 and the loose tube layer 500 will absorb heat and undergo thermal expansion and stretching. At this time, the loose tube layer 500, together with the buffer layer 400, forms a mechanical thermal compensation structure, which transforms the thermal expansion difference between the loose tube layer 500 and the fiber core 600 into harmless deformation.

[0046] 3: When the optical fiber is subjected to pressure, tension and bending, the wavy outer sheath 110 and the wavy loose tube layer 500 of the protective sleeve 100 effectively improve the bending resistance of the optical fiber, and together with the buffer layer 400, improve the compressive strength of the optical fiber. The reinforcing ribs 310 and braided tape 320 inside the reinforcing layer 300 further improve the compressive and tensile strength of the optical fiber and improve the protection performance of the fiber core 600.

[0047] Although the present invention has been described above with reference to embodiments, various modifications can be made and components can be replaced with equivalents without departing from the scope of the present invention. In particular, as long as there is no structural conflict, the features in the embodiments disclosed in this invention can be combined with each other in any way. The lack of an exhaustive description of these combinations in this specification is merely for the sake of brevity and resource conservation. Therefore, the present invention is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A single-mode optical cable, characterized by, The utility model provides a kind of protective sleeve (100), the circumferential inner wall of the protective sleeve (100) is provided with waterproof layer (200), the circumferential inner wall of the waterproof layer (200) is provided with reinforcing layer (300), the circumferential inner wall of the reinforcing layer (300) is provided with buffer layer (400), the circumferential inner wall of the buffer layer (400) is provided with loose cover layer (500), and the loose cover layer (500) is inserted with fiber core (600) in circumferential inner wall.

2. The single-mode optical cable of claim 1, wherein, The protective sleeve (100) includes inner sheath (120), and the circumferential outer wall of the inner sheath (120) is bonded with outer sheath (110), and the outer sheath (110) is in wavy structure.

3. The single-mode optical cable of claim 1 wherein, The waterproof layer (200) includes water-blocking tape (230), the circumferential outer wall of the water-blocking tape (230) is coated with water-blocking paste (220), and the circumferential outer wall of the water-blocking paste (220) is tightly attached to reinforcing film (210).

4. The single-mode optical cable of claim 1 wherein, The reinforcing layer (300) includes reinforcing rib (310), the circumferential outer wall of the reinforcing rib (310) is tightly attached to braided tape (320), and the reinforcing rib (310) and the braided tape (320) are staggered spiral distribution structure.

5. The single-mode optical cable of claim 1 wherein, The buffer layer (400) is provided with a plurality of inclined grooves in circumferential inner wall, and the angle of the inclined groove is 45 degrees.

6. The single-mode optical cable of claim 3 wherein, The loose cover layer (500) is in wavy structure, and the wavy protruding position of the loose cover layer (500) corresponds to the inclined groove position of the buffer layer (400).

7. The single-mode optical cable of claim 4 wherein, The reinforcing rib (310) is in cylindrical structure, and the cross section of the braided tape (320) is rectangular.

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