Quick erect overhead field optical cable

Abstract

The utility model discloses a kind of rapid overhead field optical cable, it is related to optical cable technical field, and its technical solution main points are: including cable core and the outer sheath covered in the outer part of cable core, cable core includes central reinforcing member, and at least one optical fiber unit and at least two force elements are twisted and arranged around central reinforcing member, optical fiber unit includes loose tube and hollow optical fiber arranged in loose tube, force element includes aramid yarn rope, and multiple structure weakening zones are arranged on the outer wall of outer sheath along length direction interval.The utility model has the advantages of good bending resistance, convenient and fast construction.

Description

Technical Field

[0001] This utility model relates to the field of optical cable technology, and more specifically, to a rapid overhead field optical cable. Background Technology

[0002] Field fiber optic cables are fiber optic communication cables specifically designed for complex environments such as field, military, or emergency communications. Their core features are excellent mechanical strength, environmental adaptability, and rapid deployment capabilities. Traditional field fiber optic cables mostly rely on direct ground laying. This method makes the cables highly susceptible to ground activities such as people walking on them, animal activity, and vehicles running over them. These external forces can cause deformation or damage to the cables, leading to signal attenuation or even interruption.

[0003] Although some optical cables are designed with enhanced tensile and compressive strength, these cables typically use solid optical fibers, which are extremely sensitive to bending, especially small-radius bending and accidental knotting. When the bending radius is too small, solid optical fibers will experience significant micro-bending loss, causing a sharp increase in the attenuation of transmitted optical signals, which severely restricts their reliability in complex field environments.

[0004] In addition, if overhead deployment is required, traditional optical cables often cannot be directly fixed and must rely on additional components such as vibration dampers and special hardware for auxiliary fixation. This not only increases deployment time and material burden, but also increases the complexity of operation and the skill requirements of personnel, making it difficult to meet the needs of rapid, simple and reliable laying under field emergency conditions.

[0005] Therefore, a new solution is needed to address this problem. Utility Model Content

[0006] In view of this, the purpose of this utility model is to provide a fast overhead field optical cable with the advantages of good bending resistance and convenient and quick construction.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a fast overhead field optical cable, comprising a cable core and an outer sheath covering the outside of the cable core. The cable core includes a central reinforcing member, and at least one optical fiber unit and at least two load-bearing elements twisted around the central reinforcing member. The optical fiber unit includes a loose tube and a hollow optical fiber disposed within the loose tube. The load-bearing elements include aramid yarn rope. Multiple structural weakening zones are arranged at intervals along the axial direction of the outer sheath on the outer wall of the outer sheath.

[0008] Preferably, the cable core further includes at least one filler rope twisted around the central reinforcement.

[0009] Preferably, the filler rope is a polypropylene rope.

[0010] Preferably, the structural weakening area is a straight groove provided on the outer wall of the outer sheath, the straight groove extending along the length direction of the outer sheath, and the depth of the straight groove being less than the wall thickness of the outer sheath.

[0011] Preferably, tear-resistant reinforcing rings are provided on the outer wall of the outer sheath at both ends of the linear groove.

[0012] Preferably, the central reinforcing member is a KFRP rod with a circular cross-section and a diameter of 1.0mm to 1.5mm.

[0013] Preferably, the loose sleeve is a PBT sleeve, and the outer diameter of the PBT sleeve is 1.8mm~2.2mm, and the wall thickness is 0.3mm~0.5mm.

[0014] Preferably, the load-bearing element further includes a PE sheath covering the outside of the aramid yarn rope.

[0015] Preferably, the amount of aramid yarn used is 2.0 g / m to 6.0 g / m.

[0016] Preferably, the outer sheath is a polyurethane sheath.

[0017] Compared with existing technologies, the advantages of the high-speed overhead field optical cable disclosed in this utility model are:

[0018] 1. The fiber optic unit uses hollow fiber. Hollow fiber transmits optical signals in an air core based on the photonic bandgap effect. This principle gives it better bending resistance and its sensitivity to bending is much lower than that of traditional solid fiber. Even if the optical cable is accidentally knotted, its signal loss is not high, thus effectively improving its robustness and fault tolerance in field deployment environments. In addition, since the optical signal is mainly transmitted in the air core, the transient impact of mechanical shock or compression on the optical signal is smaller, which is conducive to maintaining signal stability in complex ground environments. Furthermore, its excellent bending resistance also allows for more flexible selection of fixing methods when laying cables overhead, making it more suitable for the practical needs of rapid deployment in various field laying scenarios.

[0019] 2. At the same time, by setting structural weakening zones at intervals on the outer sheath, the outer sheath can be quickly peeled off along the structural weakening zones during construction, and the load-bearing elements inside the outer sheath can be directly pulled out to a certain length. The load-bearing elements can then be knotted and wrapped around to support structures such as trees and utility poles. Compared with the traditional method, this eliminates the need for additional components such as vibration dampers and special hardware, simplifies the laying process, reduces deployment time and material consumption, and can meet the needs of rapid clearance in field environments. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. 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.

[0021] Figure 1 This is a schematic diagram of the structure of the high-speed overhead field optical cable according to an embodiment of this application;

[0022] Figure 2 This is a schematic diagram of the structure weakening region in an embodiment of this application;

[0023] Figure 3 This is a schematic diagram of the rapid overhead field optical cable being laid on a support structure according to an embodiment of this application.

[0024] The numbers or letters in the attached diagram represent the names of the corresponding components:

[0025] 1. Outer sheath; 11. Straight groove; 12. Tear-resistant reinforcing ring; 2. Filler rope; 3. Fiber optic unit; 31. Loose tube; 32. Hollow fiber optic cable; 4. Load-bearing element; 41. PE sheath; 42. Aramid yarn rope; 5. Central reinforcing element. Detailed Implementation

[0026] The technical solution of this utility model will now be clearly and completely described through specific embodiments. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] Please see Figure 1 , Figure 2 and Figure 3This application provides a rapid overhead field optical cable designed to address the problems of traditional field optical cables, such as poor bending resistance, low deployment efficiency, and reliance on additional fixing hardware in complex environments. The optical cable includes a cable core and an outer sheath 1 covering the cable core. The cable core includes a central reinforcing member 5, and at least one optical fiber unit 3 and at least two load-bearing elements 4 twisted around the central reinforcing member 5 using an SZ twisting method. The SZ twisting method involves periodically alternating twisting directions, resembling the connection of the letters "S" and "Z". The optical fiber unit 3 includes a loose tube 31 and hollow optical fibers 32 disposed within the loose tube 31. The loose tube 31 is preferably a PBT (polybutylene terephthalate) sleeve. The outer diameter of the PBT sleeve is 1.8mm~2.2mm, specifically 1.8mm, 2.0mm, or 2.2mm, and the wall thickness is 0.3mm~0.5mm, specifically 0.3mm, 0.4mm, or 0.5mm. When the wall thickness of the PBT sleeve is 0.4mm, it provides sufficient lateral pressure protection to prevent the hollow optical fibers 32 from being crushed. When the outer diameter is 2.0mm, it provides sufficient space for a single or a small number of hollow optical fibers 32. By filling the space between the hollow optical fibers 32 and the PBT sleeve with grease, ample redundant buffer space can be formed, ensuring that the hollow optical fibers 32 can move freely within the sleeve when the optical cable is bent, thereby effectively relieving external stress and protecting the performance of the hollow optical fibers 32.

[0028] Multiple structural weakening zones are provided at intervals along the axial direction of the outer sheath 1 on the outer wall of the outer sheath 1. During use, the outer sheath 1 can be peeled off along the structural weakening zone by a knife. At least one load-bearing element 4 is located inside the outer sheath 1 to provide sufficient tensile strength for the cable core. A portion of at least one load-bearing element 4 can be pulled out from the peeled outer sheath 1 and knotted or wrapped and fixed to the support.

[0029] In this embodiment, the central reinforcing member 5 is a KFRP rod (aramid fiber reinforced plastic rod). The KFRP rod has a circular cross-section. KFRP material has the advantages of high strength, light weight, good lightning protection, and good electromagnetic interference resistance, making it very suitable for field environments. It also has good flexibility and is not easily damaged when bent. The diameter of the KFRP rod is 1.0mm to 1.5mm. In a preferred embodiment, the diameter of the KFRP rod is 1.2mm. At this diameter, sufficient tensile stiffness is provided while ensuring excellent bending performance, resulting in good matching with the hollow optical fiber 32.

[0030] In this embodiment, the outer sheath 1 is a polyurethane sheath. Polyurethane has excellent wear resistance, weather resistance, tear resistance and high elasticity, and can adapt well to the friction, impact and wide temperature changes that may be encountered in the field environment.

[0031] In this embodiment, the cable core also includes at least one filler rope 2 twisted around the central reinforcing member 5. The specific number of filler ropes 2 can be flexibly adjusted according to the needs of the optical cable structure. Its core function is to fill the cable core space, ensuring that the optical cable cross-section structure is round, compact, and has stable mechanical properties. The filler rope 2 is a polypropylene rope, which is a non-hygroscopic rope and can keep the inside of the optical cable dry.

[0032] In this embodiment, the structural weakening area is a straight groove 11 set on the outer wall of the outer sheath 1. The straight groove 11 extends along the length of the outer sheath 1, and the depth of the straight groove 11 is less than the wall thickness of the outer sheath 1. Construction personnel can quickly peel open the outer sheath 1 at any structural weakening area with simple tools, easily pull out a section of the load-bearing element 4, and quickly fix it by wrapping it around a support such as a tree or utility pole, which greatly simplifies the overhead laying process. To prevent the crack at the end of the structural weakening area from spreading uncontrollably during the tearing operation, resulting in large-area damage to the outer sheath 1, tear-resistant reinforcing rings 12 are set at both ends of the straight groove 11 on the outer wall of the outer sheath 1 to increase the local thickness of the outer sheath 1.

[0033] In the above embodiment, after peeling off the outer sheath 1, the peeled-off area needs to be sealed and waterproofed. The operation method is as follows: starting from the intact part of the outer sheath 1, wrap it towards the opening in a semi-overlapping manner to completely cover the peeled opening. When wrapping, appropriate tension should be applied to ensure that the tape adheres tightly. The middle layer is still wrapped in the reverse direction in a semi-overlapping manner to cover the first layer of tape. The outermost layer is wrapped with electrical tape, which mainly plays the role of mechanical protection and electromagnetic shielding, further enhancing the durability and environmental adaptability of this part.

[0034] In this embodiment, the load-bearing element 4 includes an aramid yarn rope 42. The strength of the aramid yarn rope 42 is more than five times that of steel of the same weight, greatly reducing the weight of the optical cable and facilitating field transport and rapid deployment. To further protect the aramid yarn rope 42 and facilitate the extraction of the load-bearing element 4, the load-bearing element 4 also includes a PE sheath 41 (polyethylene sheath) covering the aramid yarn rope 42. The aramid yarn rope 42 provides extremely high tensile strength, and its dosage is controlled between 2.0 g / m and 6.0 g / m, thereby ensuring sufficient tensile strength while controlling the overall weight and diameter of the optical cable. The dosage of the aramid yarn rope 42 is a key parameter optimized through rigorous experiments. By comparing the performance test results of different aramid dosages, the optimal value can be determined. The test results are shown in the table below:

[0035] 1 3.0 1500 1450 < 0.1 0.5 (Unbroken) It meets mechanical strength standards and has excellent optical performance. Recommended (Lightweight) 2 4.5 2200 2150 < 0.1 0.3 (Unbroken) It has higher strength, a sufficient safety margin, and a slightly increased weight. Optimal balance point 3 6.0 3000 2950 < 0.1 0.2 (Unbroken) It has extremely high strength, but is too heavy and expensive, and too rigid. Through design 4 2.0 1000 980 0.2 Hollow optical fibers break before aramid yarn ropes. Insufficient mechanical strength failed to effectively protect the optical fiber. Unqualified 5 0 0 50 (within the center reinforcement only) dramatic increase Immediate interruption Without load-bearing components, it is completely ineffective. Unqualified

[0036] The experimental results in the table above show that when the amount of aramid yarn 42 is 4.5 g / m, it is the recommended value to achieve the best balance between mechanical performance and the weight, flexibility and cost of the optical cable. This amount can provide a measured breaking strength of up to 2150 N, ensuring sufficient safety margin, and at 80% RTS (rated breaking force), the additional loss of hollow optical fiber 32 is less than 0.1 dB / km. Moreover, when the optical cable is stretched to the breaking point, the hollow optical fiber 32 does not break, effectively protecting the hollow optical fiber 32.

[0037] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A high-speed overhead field optical cable, comprising a cable core and an outer sheath covering the outside of the cable core, characterized in that: The cable core includes a central reinforcing member, and at least one optical fiber unit and at least two load-bearing elements stranded around the central reinforcing member. The optical fiber unit includes a loose tube and a hollow optical fiber disposed within the loose tube. The load-bearing elements include aramid yarn ropes. Multiple structural weakening zones are provided at intervals along the axial direction of the outer wall of the outer sheath.

2. The high-speed overhead field optical cable according to claim 1, characterized in that: The cable core also includes at least one filler rope twisted around the central reinforcement.

3. The high-speed overhead field optical cable according to claim 2, characterized in that: The filler rope is a polypropylene rope.

4. The high-speed overhead field optical cable according to claim 1, characterized in that: The structural weakening area is a straight groove provided on the outer wall of the outer sheath. The straight groove extends along the length of the outer sheath, and the depth of the straight groove is less than the wall thickness of the outer sheath.

5. The high-speed overhead field optical cable according to claim 4, characterized in that: Tear-resistant reinforcing rings are provided on the outer wall of the outer sheath at both ends of the straight groove.

6. The high-speed overhead field optical cable according to claim 1, characterized in that: The central reinforcing member is a KFRP rod with a circular cross-section and a diameter of 1.0mm to 1.5mm.

7. The high-speed overhead field optical cable according to claim 1, characterized in that: The loose sleeve is a PBT sleeve with an outer diameter of 1.8mm to 2.2mm and a wall thickness of 0.3mm to 0.5mm.

8. The high-speed overhead field optical cable according to claim 1, characterized in that: The load-bearing element also includes a PE sheath covering the outside of the aramid yarn rope.

9. The high-speed overhead field optical cable according to claim 1, characterized in that: The amount of aramid yarn used is 2.0 g / m to 6.0 g / m.

10. The high-speed overhead field optical cable according to claim 1, characterized in that: The outer sheath is a polyurethane sheath.

Images