An optical cable with stable excess length

Abstract

The present application relates to the field of communication technology, and in particular to an optical cable with a stable excess length. The optical cable comprises: a loose tube, wherein an optical fiber and a tube filler are arranged in the loose tube, a first non-reinforced component and a second non-reinforced component are arranged on the periphery of the loose tube, and the loose tube is located at the center of the optical cable; a loose tube base, wherein the loose tube base is used to fix the loose tube, wherein the loose tube base is in the shape of a circular ring fan, and the loose tube is embedded in the first arc surface of the loose tube base; a reinforcing component positioning groove, wherein a reinforcing component is arranged in the reinforcing component positioning groove, wherein the reinforcing component positioning groove is symmetrically arranged on both sides of the loose tube and the loose tube base, and the reinforcing component positioning groove is placed in a horizontal direction with the loose tube; a sheath, wherein the sheath is arranged on the outer side of the loose tube, the loose tube base and the reinforcing component positioning groove, and the inner side of the sheath is connected to the second arc surface of the loose tube base, and the sheath is also provided with a color ribbon at the position corresponding to the reinforcing component positioning groove. The present invention can improve the service life of the optical cable.

Description

Technical Field

[0001] The invention relates to the field of communication technology, and in particular to an optical cable with stable excess length. Background Art

[0002] After being suspended for a long time, the tensile strength of the overhead optical cable deteriorates, resulting in greater fiber attenuation. At present, there are two ways for the reinforcement of the overhead optical cable to enter the optical cable extrusion die, namely, the traditional reinforcement element is directly laid flat into the optical cable extrusion die and the reinforcement element sleeve is twisted into the optical cable extrusion die; in the former, the lengths of the lower reinforcement element, the middle optical fiber and the upper reinforcement element inside the optical cable are inconsistent. When the optical cable is suspended and stressed, the lower reinforcement element inside is straightened first, then the optical fiber is stressed, and finally the upper reinforcement element is stressed, that is, the optical fiber is stressed before the upper reinforcement element, which is easy to cause fiber breakage after long-term use; in the latter, due to the twisting of the reinforcement element, although the consistency of the reinforcement element is better, the length of the optical fiber will be shorter than the length of the yarn, and the strain of the optical fiber will be greater than the former, and there is also a risk of fiber breakage after long-term use. How to provide an optical cable that is not easy to break is an urgent problem to be solved. Summary of the invention

[0003] The object of the present invention is to provide an optical cable with stable excess length so as to reduce the risk of optical fiber breakage and increase the service life of the optical cable.

[0004] According to the present invention, there is provided an optical cable with a stable excess length, the optical cable comprising:

[0005] A loose tube, wherein an optical fiber and a tube filler are arranged inside the loose tube, a first non-reinforced component and a second non-reinforced component are arranged on the periphery of the loose tube, and the loose tube is located at the center of the optical cable.

[0006] A loose tube base is used to fix the loose tube, the loose tube base is in the shape of a circular sector, and the loose tube is embedded in the first arc surface of the loose tube base.

[0007] A reinforcing element positioning groove is provided with a reinforcing element in the reinforcing element positioning groove. The reinforcing element positioning groove is symmetrically arranged on both sides of the loose sleeve and the loose sleeve base, and the reinforcing element positioning groove is placed in a horizontal direction with the loose sleeve.

[0008] The sheath is arranged on the outside of the loose tube, the loose tube base and the reinforcing original part positioning groove, the inner side of the sheath is connected to the second arc surface of the loose tube base, and the sheath is also provided with a color ribbon at the position corresponding to the reinforcing original part positioning groove.

[0009] The present invention has at least the following beneficial effects:

[0010] The optical cable of the present invention comprises a reinforcing element positioning groove, which is used to fix the reinforcing element, thereby reducing the strain of the optical fiber of the optical cable, achieving the purpose of reducing the risk of optical fiber breakage, and improving the service life of the optical cable; on this basis, the optical cable of the present invention further adds a loose tube base, which is used to fix the loose tube, thereby avoiding the occurrence of unstable optical fiber excess length caused by the movement of the loose tube inside the optical cable during the construction of the optical cable, and making the optical fiber excess length stable and controllable; moreover, the present invention further provides a color belt at the position of the sheath corresponding to the reinforcing element positioning groove, which can mark the position of the reinforcing element and is conducive to the rapid positioning of the reinforcing element. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0012] Figure 1 A schematic cross-sectional view of an optical cable with stable excess length provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0013] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0014] According to the present invention, there is provided an optical cable with a stable excess length, such as Figure 1 As shown, the optical cable comprises:

[0015] A loose tube 6, wherein an optical fiber 3 and a tube filler 5 are arranged inside the loose tube 6, a first non-reinforced component 2 and a second non-reinforced component 4 are arranged on the periphery of the loose tube 6, and the loose tube 6 is located at the center of the optical cable.

[0016] As a specific embodiment, the material of the loose tube 6 is polybutylene terephthalate PBT, the optical fiber 3 is a single-mode or multi-mode optical fiber, the material of the tube filler 5 is fiber paste, the first non-reinforced component 2 is polyester tear rope, and the second non-reinforced component 4 is water-blocking yarn, which is composed of polyester filaments, polymer expandable water-absorbing resin and adhesive.

[0017] The loose tube base 10 is used to fix the loose tube 6 . The loose tube base 10 is in the shape of a circular sector. The loose tube 6 is embedded in a first arc surface of the loose tube base 10 .

[0018] As a specific implementation, the material of the loose tube base 10 is low smoke zero halogen LSZH, polyvinyl chloride PVC, or polyethylene PE sheath material.

[0019] A reinforcing component positioning groove 7 is provided with a reinforcing component 8 in the reinforcing component positioning groove 7 . The reinforcing component positioning groove 7 is symmetrically arranged on both sides of the loose tube 6 and the loose tube base 10 , and the reinforcing component positioning groove 7 and the loose tube 6 are placed in a horizontal direction.

[0020] As a specific implementation, the material of the reinforcing element positioning groove 7 is low smoke zero halogen, polyvinyl chloride, or polyethylene sheath material, etc., and the material of the reinforcing element 8 is aramid yarn, water-blocking glass yarn or glass yarn, etc.

[0021] The sheath 1 is arranged on the outside of the loose tube 6, the loose tube base 10 and the reinforcing original positioning groove 7, the inner side of the sheath 1 is connected to the second arc surface of the loose tube base 10, and the sheath 1 is also provided with a ribbon 9 at the position corresponding to the reinforcing original positioning groove 7.

[0022] As a specific implementation, the material of the sheath 1 and the ribbon 9 is low smoke zero halogen, polyvinyl chloride, or polyethylene sheath material.

[0023] As a preferred specific implementation, the color of the ribbon is any one of blue, orange, green, brown, gray, white, red, yellow, purple, pink, and cyan, and the width of the ribbon can be adjusted by adjusting the amount of material of the ribbon. The width of the ribbon is related to the type of optical cable, which is convenient for construction personnel to maintain identification and classify laying lines.

[0024] As a preferred specific implementation manner, the radius of the optical fiber 3 is R, the radius of the optical cable is A, the radius of the cable drum is B, the minimum height of the loose tube base 10 is C, the radius of the loose tube 6 is D, and the number of plies of a single cable drum optical cable is K. Due to the runway effect of the optical cable, the length of the reinforcing components 8 on both sides is 2×π×(A+B)×K, and the length of the optical fiber 3 is 2×π×(D+C+B)×K. By adjusting the minimum height C of the loose tube base 10, the principle that the excess length of the optical fiber 3 is all longer than the excess length of the reinforcing components 8 is achieved, that is, 2×π×(D+C+B)×K≥2×π×(A+B)×K. This achieves that the strain of the optical fiber 3 maintains a linear curve from the beginning, and there will be no risk of large attenuation and fiber breakage due to the early stress on the optical fiber 3, which is conducive to improving the service life of the optical cable.

[0025] In this embodiment, the production process of the loose tube 6 includes: the PBT material is heated and extruded by an extruder, and then water-cooled to form a PBT loose tube empty tube, the tension of the optical fiber 3 is adjusted, and then the tube filler 5 and the optical fiber 3 are injected into the mold at the same time, and the production of the PBT loose tube is completed.

[0026] In the present embodiment, the generation process of the optical cable includes: the strengthening original component 8 and the loose tube 6 are placed on the active pay-off frame, and the tension of the strengthening original component 8 and the loose tube 6 is adjusted; the strengthening original component 8, the first non-reinforced original component 2 and the second non-reinforced original component 4 are inserted into the extruder head through the mold in order, the extruder is opened, and the color strip machine is opened at the same time to inject the melted color strip material into the outer membrane of the mold, and the color strip material is merged with the optical cable sheath material to form a color band, and the sheath 1 is formed after water cooling; wherein, the loose tube base 10 is squeezed out by the extruder, and the sheath 1 and the loose tube base 10 are integrally formed; after the size of the sheath 1 is confirmed to be qualified, the loose tube 6 is inserted into the center of the mold, and pulled to the traction machine, thereby forming a cable. The production process process of the optical cable is simple and convenient, which is conducive to the large-scale production of optical cables.

[0027] The optical cable of the present embodiment includes a reinforcing element positioning groove 7, which is used to fix the reinforcing element 8, thereby reducing the strain of the optical fiber 3 of the optical cable, achieving the purpose of reducing the risk of fiber breakage of the optical fiber 3 and improving the service life of the optical cable; on this basis, the optical cable of the present embodiment is further increased with a loose tube base 10, which is used to fix the loose tube 6, thereby avoiding the occurrence of unstable excess length of the optical fiber 3 caused by the movement of the loose tube 6 inside the optical cable during the construction of the optical cable, and making the excess length of the optical fiber 3 stable and controllable; moreover, the present embodiment is further provided with a color ribbon 9 at the position of the sheath 1 corresponding to the reinforcing element positioning groove 7, which can mark the position of the reinforcing element 8 and is conducive to the rapid positioning of the reinforcing element 8.

[0028] As a preferred specific implementation, the process of obtaining C and D includes:

[0029] S100, obtaining the bending stress F of the loose tube 6 when the filling amount of the tube filler 5 is the initial filling amount 0,1 and tensile stress F 0,2 .

[0030] In this embodiment, the initial filling amount is an empirical value.

[0031] In this embodiment, the number and arrangement of the optical fibers 3 in the loose tube 6 are known. Once the number and arrangement of the optical fibers 3 in the loose tube 6 are determined, the structure of the loose tube 6 corresponding to any filling amount of the tube filler 5 is also fixed, and the corresponding bending stress and tensile stress of the loose tube 6 can also be obtained by measurement.

[0032] Those skilled in the art know that any method for obtaining bending stress and tensile stress in the prior art falls within the protection scope of the present invention.

[0033] S200, obtaining the radius R0 of the loose tube 6 when the filling amount of the tube filler 5 is the initial filling amount.

[0034] S300, obtaining the lowest height H0 of the loose tube base 10 when the filling amount of the tube filler 5 is the initial filling amount; H0=A-R0.

[0035] S400, obtaining a linear deviation G0 of the optical fiber strain when the target optical cable is stretched; the radius of the loose tube 6 of the target optical cable is R0 and the lowest height of the loose tube base 10 is H0.

[0036] As a preferred specific implementation, S400 includes:

[0037] S410, using a plurality of pulling forces of different magnitudes to stretch the target optical cable to obtain optical fiber length changes corresponding to the different pulling forces.

[0038] In this embodiment, when the optical cable is subjected to a tensile test, the magnitude of the tensile force used is an empirical value.

[0039] S420, each tension and the corresponding change in optical fiber length are determined as a set of data, the tension is used as the independent variable, the corresponding change in optical fiber length is used as the dependent variable, and linear fitting is performed on the data corresponding to the tensions of different sizes to obtain the target linear relationship between the tension and the corresponding change in optical fiber length.

[0040] In this embodiment, in the target linear relationship, the tension is the independent variable, and the change in the optical fiber length is the dependent variable.

[0041] Those skilled in the art are aware that any method for performing linear fitting on multiple sets of data in the prior art falls within the protection scope of the present invention.

[0042] S430, determining the optical fiber length change corresponding to each tension as the actual optical fiber length change, determining the optical fiber length change determined according to the target linear relationship as the predicted optical fiber length change, and obtaining the deviation value between the actual optical fiber length change corresponding to each tension and the predicted optical fiber length change.

[0043] In this embodiment, the deviation value between the actual optical fiber length change corresponding to any tension and the predicted optical fiber length change is the absolute value of the difference between the actual optical fiber length change corresponding to the tension and the predicted optical fiber length change.

[0044] S440, determining an average deviation value corresponding to the plurality of pulling forces of different magnitudes as G0.

[0045] In this embodiment, the smaller the value of G0, the more the fiber strain and the tensile force conform to the linear relationship, indicating that the fiber strain performance of the optical cable is better.

[0046] Based on S410 - S440, this embodiment can relatively accurately evaluate whether the fiber strain and stress conform to the linear relationship.

[0047] S500, according to F 0,1 、F 0,2 and G0, obtain the priority Y0 of the optical cable when the filling amount of the sleeve filler 5 is the initial filling amount.

[0048] As a preferred specific embodiment, S500 includes:

[0049] S510, according to F 0,1 、F 0,2 obtain the initial stress vector F0 of the loose tube 6; F0 = (F 0,1 , F 0,2 ).

[0050] S520, obtain the similarity sim0 between F0 and the target stress vector F' of the loose tube 6; F' = (F'1, F'2), where F'1 and F'2 are respectively the optimal bending stress and the optimal tensile stress of the preset loose tube 6.

[0051] In this embodiment, both F'1 and F'2 are empirical values.

[0052] In this embodiment, 0 < sim0 ≤ 1. The larger the value of sim0, the more similar F0 is to F', that is, F 0,1 and F 0,2 are respectively closer to F'1 and F'2.

[0053] Those skilled in the art know that any method for obtaining the similarity between two vectors in the prior art falls within the protection scope of the present invention. Optionally, the cosine similarity formula is used to obtain the similarity.

[0054] S530, obtain Y0 according to sim0, G0 and the preset first weight.

[0055] In this embodiment, sim0 is positively correlated with Y0, and G0 is negatively correlated with Y0. As a preferred specific embodiment, Y0 = β × sim0 + (1 - β) × (1 - G'0), where β is the preset first weight, 0 < β < 1, and G'0 is the value after normalizing G0. Thus, Y0 can relatively accurately evaluate the overall performance of the target optical cable. The larger the value of Y0, the better the overall performance of the target optical cable.

[0056] Those skilled in the art know that any normalization method in the prior art falls within the protection scope of the present invention.

[0057] S600, obtaining the priority Y of the optical cable when the filling amount of the casing filler 5 is the i-th filling amount i The i-th filling amount is the sum of the initial filling amount and i×w', w' is the preset filling amount adjustment step, i ranges from 1 to n, n is the preset number of adjustment times of the filling amount of the casing filler 5, and AR n ≥H', R n is the radius of the loose tube 6 when the filling amount of the tube filler 5 is the nth filling amount, and H′ is the minimum value of the preset lowest height of the loose tube base 10 .

[0058] In this embodiment, H', n and w' are all empirical values.

[0059] In this embodiment, the priority Y of the optical cable when the filling amount of the casing filler 5 is the i-th filling amount i The process of obtaining Y0 is similar to the process of obtaining Y0 mentioned above, and will not be repeated here.

[0060] S700: Obtain a set R of a preset number of optical cables with the highest priority.

[0061] In this embodiment, the preset number is an empirical value.

[0062] In this embodiment, the optical cables corresponding to the n+1 filling amounts are sorted in order of priority from large to small, and a set consisting of a preset number of optical cables is determined as R.

[0063] S800, determine the radius of the loose tube 6 of a certain optical cable in R as D, and determine AD as C.

[0064] In this embodiment, a certain optical cable can be selected from R as the optimal optical cable according to actual needs, and the radius of the loose tube 6 of the optimal optical cable is determined to be D; as an optional specific implementation, the radius of the loose tube 6 of the optical cable with the highest priority in R is determined to be D; as another optional specific implementation, it is determined which optical cable is selected from R as the optimal optical cable according to the quality of one or more other parameters of the optical cable, for example, it is determined which optical cable is selected from R as the optimal optical cable according to at least one parameter of the optical cable weight, waterproof performance and temperature adaptability range.

[0065] Although some specific embodiments of the present invention have been described in detail by way of example, it will be appreciated by those skilled in the art that the above examples are for illustration only and are not intended to limit the scope of the present invention. It will also be appreciated by those skilled in the art that various modifications may be made to the embodiments without departing from the scope and spirit of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. An optical cable with stable excess length, characterized in that: The optical cable comprises: A loose tube (6), wherein an optical fiber (3) and a tube filler (5) are arranged inside the loose tube (6), a first non-reinforced component (2) and a second non-reinforced component (4) are arranged on the periphery of the loose tube (6), and the loose tube (6) is located at the center of the optical cable; A loose tube base (10), the loose tube base (10) being used to fix a loose tube (6), the loose tube base (10) being in the shape of a circular sector, and the loose tube (6) being embedded in a first arc surface of the loose tube base (10); A reinforcing element positioning groove (7), wherein a reinforcing element (8) is arranged in the reinforcing element positioning groove (7), the reinforcing element positioning groove (7) is symmetrically arranged on both sides of the loose tube (6) and the loose tube base (10), and the reinforcing element positioning groove (7) and the loose tube (6) are placed in a horizontal direction; A sheath (1), the sheath (1) being arranged on the outside of the loose tube (6), the loose tube base (10) and the reinforcing element positioning groove (7), the inner side of the sheath (1) being connected to the second arc surface of the loose tube base (10), and the sheath (1) being further provided with a color ribbon (9) at a position corresponding to the reinforcing element positioning groove (7); The excess length of the optical fiber (3) is all longer than the excess length of the reinforcing element (8) by adjusting the minimum height of the loose tube base (10); the length of the reinforcing element (8) is 2×π×(A+B)×K, the length of the optical fiber (3) is 2×π×(D+C+B)×K, and 2×π×(D+C+B)×K>2×π×(A+B)×K, wherein A is the radius of the optical cable, B is the radius of the cable drum, C is the minimum height of the loose tube base (10), D is the radius of the loose tube (6), and K is the number of layers of the optical cable in a single cable drum.

2. The optical cable with stable excess length according to claim 1, characterized in that: The first non-reinforced component (2) is a polyester tear cord, the optical fiber (3) is a single-mode or multi-mode optical fiber, the second non-reinforced component (4) is a water-blocking yarn, and the water-blocking yarn is composed of polyester filaments, a high molecular weight swelling water-absorbing resin and an adhesive; the material of the loose tube (6) is polybutylene terephthalate, the material of the sheath (1), the reinforcement component positioning groove (7), the ribbon (9) and the loose tube base (10) is low-smoke halogen-free, polyvinyl chloride, or polyethylene sheath material, the material of the reinforcement component (8) is aramid yarn, water-blocking glass yarn or glass yarn, and the material of the tube filler (5) is fiber paste.

3. The optical cable with stable excess length according to claim 1, characterized in that: The acquisition process of C and D includes: S100, obtaining the bending stress F of the loose tube (6) when the filling amount of the tube filler (5) is the initial filling amount 0,1 and tensile stress F 0,2 ; S200, obtaining a radius R0 of the loose tube (6) when the filling amount of the tube filler (5) is equal to the initial filling amount; S300, obtaining the lowest height H0 of the loose tube base (10) when the filling amount of the tube filler (5) is the initial filling amount; H0=A-R0; S400, obtaining a linear deviation G0 of the optical fiber strain when the target optical cable is stretched; the radius of the loose tube (6) of the target optical cable is R0 and the minimum height of the loose tube base (10) is H0; S500, according to F 0,1 、F 0,2 and G0 obtains the priority Y0 of the optical cable when the filling amount of the casing filler (5) is the initial filling amount; S600, obtaining the priority Y of the optical cable when the filling amount of the casing filler (5) is the i-th filling amount i The i-th filling amount is the sum of the initial filling amount and i×w', w' is the preset filling amount adjustment step, i ranges from 1 to n, n is the number of times the preset casing filling amount (5) is adjusted, and AR n ≥H', R n is the radius of the loose tube (6) when the filling amount of the tube filler (5) is the nth filling amount, and H' is the minimum value of the preset lowest height of the loose tube base (10); S700, obtaining a set R of a preset number of optical cables with the highest priority; S800, determine the radius of the loose tube (6) of a certain optical cable in R as D, and determine AD as C.

4. The optical cable with stable excess length according to claim 3, characterized in that: S500 includes: S510, according to F 0,1 、F 0,2 Obtain the initial stress vector F0 of the loose tube (6); F0=(F 0,1 ,F 0,2 ); S520, obtaining the similarity sim0 between F0 and the target stress vector F' of the loose tube (6); F'=(F'1, F'2), where F'1 and F'2 are respectively the optimal bending stress and the optimal tensile stress of the loose tube (6); S530, obtaining Y0 according to sim0, G0 and a preset first weight.

5. The optical cable with stable excess length according to claim 3, characterized in that: S400 includes: S410, stretching the target optical cable using a plurality of pulling forces of different magnitudes to obtain changes in optical fiber length corresponding to the different pulling forces; S420, determining each tension and the corresponding change in optical fiber length as a set of data, taking the tension as an independent variable and the corresponding change in optical fiber length as a dependent variable, performing linear fitting on the data corresponding to the tensions of different magnitudes, and obtaining a target linear relationship between the tension and the corresponding change in optical fiber length; S430, determining the optical fiber length change corresponding to each tension as the actual optical fiber length change, determining the optical fiber length change determined according to the target linear relationship as the predicted optical fiber length change, and obtaining a deviation value between the actual optical fiber length change corresponding to each tension and the predicted optical fiber length change; S440, determining an average deviation value corresponding to the plurality of pulling forces of different magnitudes as G0.

6. The optical cable with stable excess length according to claim 4, characterized in that: sim0 is positively correlated with Y0, and G0 is negatively correlated with Y0.

7. The optical cable with stable excess length according to claim 6, characterized in that: Y0=β×sim0+(1-β)×(1-G'0), β is the preset first weight, 0<β<1, and G'0 is the value after normalization of G0.

8. The optical cable with stable excess length according to claim 1, characterized in that: The color of the color ribbon is any one of blue, orange, green, brown, gray, white, red, yellow, purple, pink, and cyan.

9. The optical cable with stable excess length according to claim 1, characterized in that: The width of the color band is related to the type of optical cable.

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