High-performance water-blocking yarn-tying optical cable and processing method thereof

Abstract

The invention discloses a high-performance water-blocking yarn-binding optical cable and a processing method thereof. The optical cable comprises a first water-blocking yarn, a second water-blocking yarn, a non-metal central reinforcing member, an optical fiber, a sleeve, a water-blocking layer, a sheath and a filling rope. The method comprises the following steps: 1, preparing raw materials; step 2, laying a central reinforcing piece; step 3, packaging the optical fiber sleeve; step 4, filling with a filling rope; step 5, laying a waterproof layer; step 6, extruding a sheath; and step 7, detecting and packaging. According to the invention, a full-dry layer-stranded structure is designed, water-blocking and fixing functions are integrated through the water-blocking yarn, traditional yarn can be replaced, a cable core is stably fixed, optical fibers are prevented from loosening, cable paste can be replaced, excellent water-blocking performance is shown, and compared with a factice water-blocking mode, the water-blocking yarn is safer and more environment-friendly, and the water-blocking yarn is more convenient to use. The environment pollution and potential harm to human bodies are effectively reduced, the production process is simplified, and the requirement for extra water-blocking materials such as factice is lowered.

Description

Technical Field

[0001] The invention relates to the technical field of water-blocking optical cables, and in particular to a high-performance water-blocking yarn-bound optical cable and a processing method thereof. Background Art

[0002] Optical cable is a communication cable assembly manufactured to meet optical, mechanical or environmental performance specifications. It uses one or more optical fibers placed in a sheath as the transmission medium. It can be used alone or in groups to achieve the transmission of optical signals. Its basic structure is generally composed of a cable core, reinforcing steel wire, filler, sheath, and waterproof layer, buffer layer, insulated metal wire and other components added as needed; among them, the cable core is composed of a certain number of optical fibers in a certain way, and is covered with a sheath, and some are also covered with an outer sheath; the optical fiber is the core part of the optical cable, made of glass fibers as thin as hair, and has a plastic coating on the outside to protect the optical fiber from damage.

[0003] Patent publication number CN108646363A discloses a water-blocking optical fiber, which includes a core located in the center, a cladding located outside the core, and an inner coating layer located outside the cladding; it is characterized in that an inner water-blocking layer is provided outside the inner coating layer, an outer water-blocking layer is provided outside the inner water-blocking layer, and an outer coating layer is provided outside the outer water-blocking layer.

[0004] The patent with patent publication number CN215867265U discloses a special low-temperature resistant optical cable, including a cable core, a water-blocking tape, a low-temperature resistant fiber layer, an inner protective layer, an armor layer, a polyurethane foam layer and an outer protective layer arranged in sequence from the inside to the outside, the cable core is filled with low-temperature grease, the cable core includes a non-metallic central reinforcement member located at the center and a plurality of optical fiber cores and a plurality of reinforcement members arranged on the periphery of the non-metallic central reinforcement member, the optical fiber core includes a tight sleeve and a plurality of twisted optical fibers arranged therein, and the gap between the tight sleeve and the optical fiber is filled with low-temperature fiber grease.

[0005] Patent publication number CN116338883A discloses an optical cable and a method for manufacturing the same. The inner hole is filled with optical fiber grease, the loose tube assembly contains an optical fiber bundle with 12 to 144 cores, and the optical cable is made of environmentally friendly materials, which is more environmentally friendly. The method for manufacturing the optical cable has higher production efficiency and lower production cost.

[0006] In the above scheme, the gaps in the core of multi-conductor wires and cables are filled with grease to play the role of moisture-proof, water-blocking and insulation. However, the grease has the following disadvantages: First, the grease is highly polluting; its widespread use not only poses a significant pollution risk to the environment and affects the ecological balance, but may also cause potential harm to human health. At the same time, the use of the grease is accompanied by an increase in costs, including procurement, storage, processing and potential environmental governance costs, which increases the cost burden of the overall project and lacks economic and environmental protection considerations; Second, before the optical cable is connected, it is necessary to carry out tedious grease removal and optical fiber cleaning work, which is a The additional steps significantly slowed down the installation progress and resulted in decreased installation efficiency. At the same time, the additional work process also directly pushed up the installation cost. In addition, the optical cable itself is heavy, which not only makes the laying process difficult, but also brings inconvenience to the subsequent maintenance and inspection work, and the overall construction cost has therefore risen. Third, non-dry water-blocking materials show poor compatibility in the integration with optical fibers and optical cable components, which to a certain extent affects the overall performance of the optical cable, including but not limited to decreased transmission efficiency, increased signal attenuation, and impaired long-term stability, which may in turn affect the operating quality and reliability of the entire communication system. Summary of the invention

[0007] The object of the present invention is to provide a high-performance water-blocking yarn-bound optical cable and a processing method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0008] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a high-performance water-blocking yarn-bundled optical cable, comprising a sheath, a water-blocking layer is sleeved on the inner wall of the sheath, the water-blocking layer is composed of a water-blocking tape and a water-blocking yarn, a non-metallic central reinforcement member, a casing and a filling rope are sleeved in the water-blocking layer, wherein the casing and the filling rope are distributed around the non-metallic central reinforcement member as the center, a first water-blocking yarn is arranged in the water-blocking layer, and the first water-blocking yarn is wrapped around the outside of the first water-blocking yarn.

[0009] As a further technical solution of the present invention, a second water-blocking yarn and an optical fiber are sleeved in the sleeve.

[0010] A processing method for a high-performance water-blocking yarn-bound optical cable comprises the following steps: first, preparing raw materials; second, laying a central reinforcement member; third, packaging an optical fiber sleeve; fourth, filling a filling rope; fifth, laying a water-blocking layer; sixth, extruding a sheath; and seventh, testing and packaging.

[0011] In the above step 1, raw materials required for optical cable processing are prepared;

[0012] In the above step 2, a non-metallic central reinforcement is laid to ensure good straightness and wrapped with a first water-blocking yarn;

[0013] In the above step 3, the optical fiber and the second water-blocking yarn are encapsulated in a casing;

[0014] In the above step 4, a suitable number of filling ropes are selected for laying according to the optical cable specifications;

[0015] In the above step 5, the water-blocking layer is twisted and wrapped, which can fix the optical fiber and maintain the water-blocking performance;

[0016] In the above step 6, the optical cable core is fed as a whole into a sheath extruder for sheath extrusion processing;

[0017] In the above step seven, the optical cable is visually inspected to ensure that it is free of damage and distortion, a water-blocking performance test is performed to ensure that the optical cable meets the design requirements, and a mechanical performance test of stretching, flattening, and torsion is performed to ensure that the optical cable structure is stable and reliable.

[0018] As a further technical solution of the present invention, in the step one, a high-performance water-blocking yarn is selected, which is required to have excellent water-blocking properties and good mechanical strength, and the diameter is controlled between 2.0 mm and 2.5 mm to ensure that it can effectively block water and firmly fix the optical fiber. A non-metallic central reinforcement member made of aramid fiber material is selected, and the diameter is determined according to the design requirements of the optical cable. The sleeve material is polyvinyl chloride or low-smoke halogen-free material, and the inner diameter is slightly larger than the diameter of the optical fiber to provide sufficient protection space. A wear-resistant and corrosion-resistant polyethylene sheath is selected, and the thickness is determined according to the specifications and design requirements of the optical cable.

[0019] As a further technical solution of the present invention, in the step two, the non-metallic center reinforcement is placed at the center of the production line to ensure good straightness, an automatic centering device is used to ensure that the reinforcement is accurately positioned, and the non-metallic center reinforcement is passed through a layer twisting machine to twist the first water-blocking yarn layer around the non-metallic center reinforcement.

[0020] As a further technical solution of the present invention, in step three, a suitable number of optical fibers are selected according to the optical cable specifications and laid together, and a second water-blocking yarn is wrapped around the outer periphery through a layer stranding machine to form a whole and be inserted into the casing.

[0021] As a further technical solution of the present invention, in the step 4, a proper amount of filling rope is filled around the non-metallic central reinforcement member, and the filling density is adjusted according to the optical cable diameter and design requirements to ensure tight filling without gaps.

[0022] As a further technical solution of the present invention, in the step five, a layer twisting machine is used to twist the optical fiber wrapped in the sleeve around the non-metallic central reinforcement, and the layer twisting pitch is determined according to the optical cable design specifications. During the layer twisting process, a water-blocking yarn winding machine is used simultaneously to evenly wind the water-blocking yarn on the optical fiber layer twisting structure. The yarn tension needs to be controlled within the range of 5-10N to ensure that the optical fiber can be fixed and the water-blocking performance can be maintained.

[0023] As a further technical solution of the present invention, in the step five, a water-blocking tape winding machine is used to wind the water-blocking tape on the outer layer of the water-blocking yarn to ensure that the water-blocking tape completely covers the yarn layer without gaps or uneven overlaps, and the water-blocking yarn and the water-blocking tape form a dry water-blocking layer.

[0024] As a further technical solution of the present invention, in step six, the optical cable core with the water-blocking layer is fed into an extruder, and the sheath material is extruded through a die to form a complete optical cable structure. The extrusion temperature, speed and pressure of the sheath need to be adjusted according to the material properties to ensure the quality of the sheath. After cooling, the sheath is cut into a specified length to complete the optical cable production.

[0025] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention is designed with a fully dry layer-twisted structure, which integrates water-blocking and fixing functions through water-blocking yarn, which can not only replace traditional yarn, firmly fix the cable core, and prevent the optical fiber from loosening, but also replace cable paste, showing excellent water-blocking performance. Compared with the oil paste water-blocking method, the water-blocking yarn is safer and more environmentally friendly, effectively reducing environmental pollution and potential harm to the human body, and simplifying the production process, reducing the demand for additional water-blocking materials such as oil paste, thereby significantly reducing the overall production cost. At the same time, the application of water-blocking yarn avoids the tedious oil paste removal and optical fiber cleaning work before optical cable splicing, improves installation efficiency, reduces installation costs, and reduces the overall weight of the optical cable, making the laying process more convenient, and subsequent maintenance and repair work also becomes easier and more efficient, reducing the operation and maintenance cost of the entire system, and the dry water-blocking material has better compatibility with the various components of the optical fiber cable, which not only ensures the stability and reliability of the optical cable structure, but also avoids the performance degradation or failure risks that may be caused by material incompatibility, ensuring the long-term stable operation of the optical cable in a complex and changeable environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the internal structure of the optical cable of the present invention;

[0027] Figure 2 It is a schematic diagram of the cross-sectional structure of the optical cable of the present invention;

[0028] Figure 3 The figure is a flow chart of the method of the present invention.

[0029] In the figure: 1. first water-blocking yarn; 2. second water-blocking yarn; 3. non-metallic central reinforcement; 4. optical fiber; 5. casing; 6. water-blocking layer; 7. sheath; 8. filling rope. DETAILED DESCRIPTION

[0030] 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 ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] Please see attached Figure 1 -Attached Figure 2 An embodiment of the present invention is as follows: a high-performance water-blocking yarn-bundled optical cable comprises a sheath 7, a water-blocking layer 6 is sleeved on the inner wall of the sheath 7, the water-blocking layer 6 is composed of a water-blocking tape and a water-blocking yarn, a non-metallic central reinforcement member 3, a sleeve 5 and a filling rope 8 are sleeved in the water-blocking layer 6, wherein the sleeve 5 and the filling rope 8 are distributed around the non-metallic central reinforcement member 3, a first water-blocking yarn 1 is arranged in the water-blocking layer 6, and the first water-blocking yarn 1 is wrapped around the outside of the first water-blocking yarn 1; a second water-blocking yarn 2 and an optical fiber 4 are sleeved in the sleeve 5.

[0032] Please see attached Figure 3 The present invention provides an embodiment: a method for processing a high-performance water-blocking yarn-bound optical cable, comprising step one, raw material preparation; step two, central reinforcement member laying; step three, optical fiber sleeve packaging; step four, filling with filling rope; step five, water-blocking layer laying; step six, sheath extrusion; step seven, inspection and packaging;

[0033] In the above step 1, a high-performance water-blocking yarn is selected, which is required to have excellent water-blocking performance and good mechanical strength, and the diameter is controlled between 2.0 mm and 2.5 mm to ensure that it can effectively block water and firmly fix the optical fiber 4. A non-metallic central reinforcement member 3 made of aramid fiber material is selected, and the diameter is determined according to the design requirements of the optical cable. The sleeve 5 is made of polyvinyl chloride or low-smoke halogen-free material, and the inner diameter is slightly larger than the diameter of the optical fiber 4 to provide sufficient protection space. A sheath 7 made of wear-resistant and corrosion-resistant polyethylene material is selected, and the thickness is determined according to the specifications and design requirements of the optical cable;

[0034] In the above step 2, the non-metallic central reinforcement 3 is placed at the center of the production line to ensure good straightness, an automatic centering device is used to ensure that the reinforcement is accurately positioned, and the non-metallic central reinforcement 3 is passed through a layer twisting machine to twist the first water-blocking yarn 1 around the non-metallic central reinforcement 3;

[0035] In the above step 3, a suitable number of optical fibers 4 are selected according to the optical cable specifications and laid together, and the second water-blocking yarn 2 is wrapped around the outer periphery by a layer stranding machine to form a whole and be sheathed in the casing 5;

[0036] In the above step 4, a proper amount of filling rope 8 is filled around the non-metallic central reinforcement member 3, and the filling density is adjusted according to the cable diameter and design requirements to ensure that the filling is tight and there is no gap;

[0037] In the above step five, the optical fiber 4 wrapped in the sleeve 5 is twisted around the non-metallic central reinforcement 3 by a layer twisting machine, and the layer twisting pitch is determined according to the optical cable design specifications. In the layer twisting process, a water-blocking yarn winding machine is used synchronously to evenly wind the water-blocking yarn on the optical fiber 4 layer twisted structure, and the yarn tension needs to be controlled within the range of 5-10N to ensure that the optical fiber 4 can be fixed and the water-blocking performance can be maintained. On the outer layer of the water-blocking yarn, a water-blocking tape winding machine is used to wind the water-blocking tape to ensure that the water-blocking tape completely covers the yarn layer without gaps or uneven overlaps. The water-blocking yarn and the water-blocking tape form a dry water-blocking layer 6;

[0038] In the above step six, the optical cable core with the water-blocking layer 6 is fed into an extruder, and the sheath 7 material is extruded through a die to form a complete optical cable structure. The extrusion temperature, speed and pressure of the sheath 7 need to be adjusted according to the material properties to ensure the quality of the sheath 7. After cooling, it is cut into a specified length to complete the optical cable production;

[0039] In the above step seven, the optical cable is visually inspected to ensure that it is free of damage and distortion, a water-blocking performance test is performed to ensure that the optical cable meets the design requirements, and a mechanical performance test of stretching, flattening, and torsion is performed to ensure that the optical cable structure is stable and reliable. The main technical indicators are shown in the following table.

[0040]

[0041] Based on the above, the advantages of the present invention are: when producing and processing the present invention, firstly, a high-performance water-blocking yarn is selected, which is required to have excellent water-blocking performance and good mechanical strength, and the diameter is controlled between 2.0mm and 2.5mm to ensure that it can effectively block water and firmly fix the optical fiber 4. A non-metallic central reinforcement member 3 made of aramid fiber material is selected, and the diameter is determined according to the design requirements of the optical cable. The sleeve 5 is made of polyvinyl chloride or low-smoke halogen-free material, and the inner diameter is slightly larger than the diameter of the optical fiber 4 to provide sufficient protection space. A sheath 7 made of wear-resistant and corrosion-resistant polyethylene material is selected, and the thickness is determined according to the specifications and design requirements of the optical cable. Then, the non-metallic central reinforcement member 3 is placed in the center of the production line to ensure good straightness, and an automatic centering device is used to ensure the position of the reinforcement member. Accurately, and pass the non-metallic central reinforcement 3 through a layer twisting machine, twist the first water-blocking yarn 1 around the non-metallic central reinforcement 3, select a suitable number of optical fibers 4 according to the cable specifications and lay them together, and wrap the second water-blocking yarn 2 around the periphery through a layer twisting machine, form a whole and put it into the sleeve 5, fill the non-metallic central reinforcement 3 with a proper amount of filling rope 8, and adjust the filling density according to the cable diameter and design requirements to ensure that the filling is tight and there is no gap. Use a layer twisting machine to twist the optical fiber 4 wrapped in the sleeve 5 around the non-metallic central reinforcement 3, and the layer twisting pitch is determined according to the cable design specifications. During the layer twisting process, use a water-blocking yarn winding machine simultaneously to evenly wind the water-blocking yarn around the optical fiber 4 layer twisted structure, and the yarn tension needs to be controlled within the range of 5-10N to ensure It can not only fix the optical fiber 4 but also maintain the water-blocking performance. On the outer layer of the water-blocking yarn, a water-blocking tape winding machine is used to wind the water-blocking tape to ensure that the water-blocking tape completely covers the yarn layer without gaps or uneven overlap. The water-blocking yarn and the water-blocking tape form a dry water-blocking layer 6. The optical cable core with the water-blocking layer 6 is sent to the extruder, and the sheath 7 material is extruded through a mold to form a complete optical cable structure. The extrusion temperature, speed and pressure of the sheath 7 need to be adjusted according to the material properties to ensure the quality of the sheath 7. After cooling, it is cut into a specified length to complete the optical cable production. Finally, the optical cable is inspected for appearance to ensure that there is no damage or distortion, and a water-blocking performance test is performed to ensure that the optical cable meets the design requirements. The mechanical performance tests of stretching, flattening and torsion are performed to ensure that the optical cable structure is stable and reliable. The present invention is designed with a fully dry type The layered twisted structure integrates water-blocking and fixing functions through water-blocking yarn. It can not only replace traditional yarn, firmly fix the cable core and prevent loosening, but also replace cable paste, showing excellent water-blocking performance. Compared with the oil-blocking method, the water-blocking yarn is safer and more environmentally friendly, effectively reducing environmental pollution and potential harm to the human body, and simplifying the production process, reducing the demand for additional water-blocking materials such as oil, thereby significantly reducing the overall production cost. At the same time, the application of water-blocking yarn avoids the tedious oil removal and cleaning work before optical cable splicing, improves installation efficiency, reduces installation costs, and reduces the overall weight of the optical cable, making the laying process more convenient. The subsequent maintenance and inspection work has also become easier and more efficient, reducing the operation and maintenance cost of the entire system.The dry water-blocking material has better compatibility with the components of the optical cable, which not only ensures the stability and reliability of the optical cable structure, but also avoids the risk of performance degradation or failure caused by material incompatibility, ensuring the long-term stable operation of the optical cable in a complex and changing environment.

[0042] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

Claims

1. A high-performance water-blocking yarn-bound optical cable, comprising a sheath (7), characterized in that: A water-blocking layer (6) is sleeved on the inner wall of the sheath (7), the water-blocking layer (6) is composed of a water-blocking tape and a water-blocking yarn, a non-metallic central reinforcement member (3), a sleeve (5) and a filling rope (8) are sleeved in the water-blocking layer (6), wherein the sleeve (5) and the filling rope (8) are distributed around the non-metallic central reinforcement member (3) as the center, and a first water-blocking yarn (1) is arranged in the water-blocking layer (6), and the first water-blocking yarn (1) is wrapped around the outside of the first water-blocking yarn (1).

2. A high-performance water-blocking yarn-bound optical cable according to claim 1, characterized in that: The sleeve (5) is sleeved with a second water-blocking yarn (2) and an optical fiber (4).

3. A method for processing a high-performance water-blocking yarn-bound optical cable, comprising step 1, raw material preparation; step 2, central reinforcement member laying; step 3, optical fiber sleeve packaging; step 4, filling with filling rope; step 5, water-blocking layer laying; step 6, sheath extrusion; step 7, testing and packaging; characterized in that: In the above step 1, raw materials required for optical cable processing are prepared; In the above step 2, a non-metallic central reinforcement member (3) is laid to ensure good straightness and wrapped with the first water-blocking yarn (1); In the above step 3, the optical fiber (4) and the second water-blocking yarn (2) are encapsulated in a sleeve (5); In the above step 4, a suitable number of filling ropes (8) are selected for laying according to the optical cable specifications; In the above step 5, the water-blocking layer (6) is twisted and wound, which can fix the optical fiber (4) and maintain the water-blocking performance; In the above step 6, the optical cable core is fed as a whole into a sheath (7) extruder for sheath (7) extrusion processing; In the above step seven, the optical cable is visually inspected to ensure that it is free of damage and distortion, a water-blocking performance test is performed to ensure that the optical cable meets the design requirements, and a mechanical performance test of stretching, flattening, and torsion is performed to ensure that the optical cable structure is stable and reliable.

4. A method for processing a high-performance water-blocking yarn-bound optical cable according to claim 3, characterized in that: In the step 1, a high-performance water-blocking yarn is selected, which is required to have excellent water-blocking performance and good mechanical strength, and the diameter is controlled between 2.0 mm and 2.5 mm to ensure that it can effectively block water and firmly fix the optical fiber (4). A non-metallic central reinforcement member (3) made of aramid fiber material is selected, and the diameter is determined according to the design requirements of the optical cable. The sleeve (5) is made of polyvinyl chloride or low-smoke halogen-free material, and the inner diameter is slightly larger than the diameter of the optical fiber (4) to provide sufficient protection space. A sheath (7) made of wear-resistant and corrosion-resistant polyethylene material is selected, and the thickness is determined according to the specifications and design requirements of the optical cable.

5. The method for processing a high-performance water-blocking yarn-bound optical cable according to claim 3, characterized in that: In the step 2, the non-metallic central reinforcement (3) is placed at the center of the production line to ensure good straightness, an automatic centering device is used to ensure that the reinforcement is accurately positioned, and the non-metallic central reinforcement (3) is passed through a layer twisting machine to twist the first water-blocking yarn (1) around the non-metallic central reinforcement (3).

6. A method for processing a high-performance water-blocking yarn-bound optical cable according to claim 3, characterized in that: In the step three, a suitable number of optical fibers (4) are selected according to the optical cable specifications and laid together, and a second water-blocking yarn (2) is wrapped around the outer periphery by a layer twisting machine to form a whole and be inserted into the casing (5).

7. A method for processing a high-performance water-blocking yarn-bound optical cable according to claim 3, characterized in that: In the step 4, a proper amount of filling rope (8) is filled around the non-metallic central reinforcement member (3), and the filling density is adjusted according to the optical cable diameter and design requirements to ensure that the filling is tight and has no gaps.

8. The method for processing a high-performance water-blocking yarn-bound optical cable according to claim 3, characterized in that: In the step five, the optical fiber (4) wrapped in the sleeve (5) is twisted around the non-metallic central reinforcement (3) using a twisting machine, and the twisting pitch is determined according to the optical cable design specifications. During the twisting process, a water-blocking yarn winding machine is used simultaneously to evenly wind the water-blocking yarn on the twisted structure of the optical fiber (4). The yarn tension needs to be controlled within the range of 5-10N to ensure that the optical fiber (4) can be fixed while maintaining the water-blocking performance.

9. A method for processing a high-performance water-blocking yarn-bound optical cable according to claim 8, characterized in that: In step 5, a water-blocking tape is wound on the outer layer of the water-blocking yarn using a water-blocking tape winding machine to ensure that the water-blocking tape completely covers the yarn layer without gaps or uneven overlaps. The water-blocking yarn and the water-blocking tape form a dry water-blocking layer (6).

10. A method for processing a high-performance water-blocking yarn-bound optical cable according to claim 3, characterized in that: In step six, the optical cable core with the water-blocking layer (6) is fed into an extruder, and the sheath (7) material is extruded through a die to form a complete optical cable structure. The extrusion temperature, speed and pressure of the sheath (7) need to be adjusted according to the material properties to ensure the quality of the sheath (7). After cooling, the sheath (7) is cut into a specified length to complete the production of the optical cable.

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