Light submarine cable and production method thereof

Abstract

The invention provides a light submarine cable and a production method thereof, and relates to the technical field of optical cable manufacturing. The light submarine cable comprises: an optical fiber unit comprising at least one optical fiber; the at least one armor layer surrounds the outer side of the optical fiber unit; the armor layer comprises a plurality of spirally-twisted plastic-coated steel wires, and each plastic-coated steel wire comprises a steel wire core and a plastic layer wrapping the steel wire core. The light submarine cable provided by the invention can meet the requirement of high tensile strength, has the characteristics of light weight and high corrosion resistance, and is convenient to lay and transport.

Description

Technical Field

[0001] The present application relates to the technical field of optical cable manufacturing, and in particular to a light submarine cable and a production method thereof. Background Art

[0002] Submarine cables are key infrastructure for international communications, carrying 95% of global communications business and serving as the main carrier for information transmission. With the continuous development of information technology, the construction and maintenance of submarine cables have become increasingly important to meet the growing demand for communications.

[0003] Traditional submarine cables are usually composed of multi-layer structures, including optical fiber core, armor layer and sheath layer, etc. These structures can protect the optical fiber from the influence of the submarine environment and ensure high-quality signal transmission.

[0004] However, although the multi-layer protection structure improves the strength of the submarine cable, it also reduces the flexibility of the submarine cable and increases the weight of the submarine cable. Therefore, traditional submarine cables are usually large and heavy, making them difficult to bend and install. During the laying process, they may cause damage to the seabed ecology and affect the survival and reproduction of marine life. Summary of the invention

[0005] In view of the above problems, the embodiments of the present application provide a light submarine cable and a production method thereof. The light submarine cable can meet the requirements of high tensile strength, and has the characteristics of light weight and strong corrosion resistance, and is easy to lay and transport.

[0006] In order to achieve the above objectives, the embodiments of the present application provide the following technical solutions:

[0007] One aspect of the present application provides a light submarine cable, comprising: an optical fiber unit, comprising at least one optical fiber; at least one armor layer, surrounding the outer side of the optical fiber unit; the armor layer comprises a plurality of spirally twisted plastic-coated steel wires, the plastic-coated steel wires comprising a steel wire core and a plastic layer wrapped outside the steel wire core.

[0008] In a possible implementation manner, the plastic layer is a fiber-reinforced composite layer.

[0009] In a possible implementation manner, the armor layer includes at least two layers, and the armor layers are stacked in sequence from the inside to the outside.

[0010] In a possible implementation manner, the gaps between the plastic-coated steel wires are filled with a water-blocking material.

[0011] In a possible implementation, the optical fiber unit includes a plurality of optical fibers, each of which is twisted in a spiral, and the optical fiber unit further includes a loose tube sleeved outside all the optical fibers;

[0012] The gaps between the optical fibers and the gaps between the optical fibers and the loose tube are filled with water-blocking fiber paste.

[0013] In a possible implementation manner, it further includes: an inner protective layer, which is arranged between the optical fiber unit and the armor layer.

[0014] In a possible implementation, it further includes: at least one outer protective layer surrounding the outer side of the armor layer.

[0015] In a possible implementation, it further includes: a wrapping layer, disposed between the armor layer and the outer protective layer.

[0016] Another aspect of the present application provides a method for producing a submarine cable, comprising:

[0017] An optical fiber unit is formed, the optical fiber unit comprising at least one optical fiber.

[0018] At least one armor layer surrounds the outer side of the optical fiber unit.

[0019] Wherein, forming the armor layer includes: providing a steel wire core.

[0020] A plastic layer is wrapped around the steel wire core to form a plastic-coated steel wire.

[0021] Multiple plastic-coated steel wires are spirally twisted outside the optical fiber unit to form an armor layer.

[0022] In a possible implementation manner, after the armor layer is formed, the method further includes: filling water-blocking material in the gaps between the plastic-coated steel wires.

[0023] In a possible implementation manner, the optical fiber unit includes a plurality of optical fibers, and forming the optical fiber unit includes:

[0024] Pull each optical fiber.

[0025] Loose tubes are installed outside all optical fibers, and water-blocking fiber paste is filled in the gaps between the optical fibers and between the optical fibers and the loose tubes.

[0026] In a possible implementation manner, after the armor layer is surrounded on the outside of the optical fiber unit, the method further includes:

[0027] A wrapping layer is formed by winding outside the armor layer; and at least one outer protective layer is formed by winding outside the wrapping layer.

[0028] The present application provides a light submarine cable and a production method thereof, wherein the light submarine cable comprises an optical fiber unit and at least one armor layer. The optical fiber unit comprises at least one optical fiber. The armor layer surrounds the outer side of the optical fiber unit and is formed by spirally twisting a plurality of plastic-coated steel wires. Among them, the plastic-coated steel wire is formed by wrapping a plastic layer outside the steel wire core. With such a configuration, the steel wire core in the plastic-coated steel wire can enhance the mechanical strength of the armor layer and ensure the stability of the armor layer in the submarine environment. At the same time, the plastic layer in the plastic-coated steel wire can reduce the weight of the armor layer and can make the armor layer have excellent corrosion resistance and flexibility. In this way, the use of plastic-coated steel wire as the armor layer of the light submarine cable can effectively reduce the weight of the light submarine cable while enabling the light submarine cable to meet the requirements of high tensile strength. In addition, the light submarine cable can have excellent corrosion resistance and flexibility, can effectively resist physical wear and chemical erosion on the seabed, and extend the service life of the light submarine cable. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 A schematic diagram of the structure of an aluminum core submarine cable provided in an embodiment of the present application;

[0031] Figure 2 A flow chart of the steps of a method for producing a lightweight submarine cable provided in an embodiment of the present application.

[0032] Description of reference numerals:

[0033] 10-Lightweight submarine cable;

[0034] 100-fiber unit; 200-armor layer; 300-wrapping layer; 400-inner sheath; 500-outer sheath;

[0035] 210-plastic coated steel wire;

[0036] 211- steel wire core; 212- plastic layer. DETAILED DESCRIPTION

[0037] As mentioned in the background, submarine cables are the central nervous system of the global communications network, responsible for transmitting most of the international data traffic across the ocean. They play a key role in daily communications, international financial markets, and scientific research, ensuring the rapid flow of global information and promoting international cooperation and economic development. As the global demand for high-speed Internet and data transmission continues to increase, the construction and maintenance of submarine cables has become increasingly important.

[0038] Traditional submarine cables mostly use galvanized steel wire as the armor layer. Galvanized steel wire has excellent mechanical strength and can provide the necessary tensile strength and compressive resistance for the submarine cable, ensuring that the submarine cable is not easily broken or deformed during laying and use.

[0039] However, due to the heavy weight of galvanized steel wire, the overall weight of the submarine cable is likely to be large. This weight burden not only requires the submarine cable to rely on large professional laying ships and heavy equipment during the laying process, but also limits its flexibility in shallow waters and complex terrain. During laying, the larger bending radius requires a wider operating space, which increases the difficulty and time of construction.

[0040] Secondly, the large equipment and ships used in the laying process may cause damage to the seabed ecosystem. The operation of mechanical equipment may disturb the seabed, affecting the habitat of marine life and thus affecting their survival and reproduction.

[0041] In addition, the large size and weight of galvanized steel wire also lead to high transportation costs. More resources and more complex logistics arrangements are required during transportation, which not only increases costs but also makes storage more difficult.

[0042] In view of this, an embodiment of the present application provides a light submarine cable and a production method thereof, wherein the light submarine cable comprises an optical fiber unit and at least one armor layer. The optical fiber unit comprises at least one optical fiber. The armor layer surrounds the outer side of the optical fiber unit and is formed by spirally twisting a plurality of plastic-coated steel wires. Among them, the plastic-coated steel wire is formed by wrapping a plastic layer outside the steel wire core. In this way, the steel wire core in the plastic-coated steel wire can enhance the mechanical strength of the armor layer and ensure the stability of the armor layer in the submarine environment. At the same time, the plastic layer in the plastic-coated steel wire can reduce the weight of the armor layer and can make the armor layer have excellent corrosion resistance and flexibility. In this way, using the plastic-coated steel wire as the armor layer of the light submarine cable can effectively reduce the weight of the light submarine cable while enabling the light submarine cable to meet the requirements of high tensile strength. In addition, the light submarine cable can have excellent corrosion resistance and flexibility, can effectively resist physical wear and chemical erosion on the seabed, and extend the service life of the light submarine cable.

[0043] In order to make the above-mentioned purposes, features and advantages of the embodiments of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work belong to the scope of protection of this application.

[0044] Figure 1 This is a schematic diagram of the structure of the aluminum core submarine cable provided in the embodiment of the present application. Figure 1As shown, the embodiment of the present application provides a light submarine cable 10, which is light in weight, easy to lay and maintain, and can be laid in a complex submarine environment. The light submarine cable 10 can be used in fields such as transoceanic communications, submarine observation systems, and marine resource exploration. Alternatively, the light submarine cable 10 can also be used in the connection between offshore wind farms and offshore oil platforms to ensure smooth communication and data exchange between these facilities and land infrastructure.

[0045] The light submarine cable 10 includes an optical fiber unit 100 and at least one armor layer 200. The optical fiber unit 100 includes at least one optical fiber (not shown in the figure), which is used to achieve high-speed and high-capacity data transmission. The armor layer 200 surrounds the outer side of the optical fiber unit 100 and can provide an important physical barrier for the optical fiber unit 100 to prevent it from being subjected to external mechanical damage such as scratches and impacts from seabed rocks, fishing gear or anchors. In addition, during the laying and maintenance of the light submarine cable 10, the armor layer 200 can provide the necessary tensile strength to ensure that the optical fiber is not damaged when stretched and bent, ensuring that the light submarine cable 10 can operate reliably for a long time in a complex marine environment.

[0046] Specifically, the optical fiber unit 100 may include a plurality of optical fibers (not shown in the figure), each of which is twisted together in a spiral, and the outer jacket of the optical fiber is provided with a loose tube (not shown in the figure). The loose tube may be made of stainless steel or other corrosion-resistant metal materials, and the loose tube can provide a buffer space for the optical fiber, allowing the optical fiber to have a certain movement space when subjected to external impact or vibration, thereby reducing direct mechanical damage to the optical fiber.

[0047] In addition, the gaps between the optical fibers and the gaps between the optical fibers and the loose tubes can be filled with water-blocking fiber paste (not shown in the figure). The water-blocking fiber paste can form a waterproof barrier to prevent moisture from entering the interior of the optical fiber under high pressure and high humidity conditions, ensure the stability of signal transmission, and help extend the service life of the light submarine cable 10.

[0048] Reference Figure 1 As shown, in this embodiment, the armor layer 200 is composed of a plastic-coated steel wire 210, and the plastic-coated steel wire 210 includes a steel wire core 211 and a plastic layer 212 wrapped outside the steel wire core 211. Among them, the steel wire core 211 can enhance the mechanical strength of the armor layer 200 and ensure its stability in the seabed environment. The plastic layer 212 can reduce the weight of the armor layer 200, and can make the armor layer 200 have excellent corrosion resistance and flexibility, and can effectively resist physical wear and chemical erosion on the seabed.

[0049] Compared with the traditional submarine cable which usually uses galvanized steel wire as the armor layer, the armor layer 200 material of the light submarine cable 10 of this embodiment uses plastic-coated steel wire 210, which can effectively reduce the overall weight of the light submarine cable 10, making the light submarine cable 10 more flexible when laying, able to adapt to complex seabed terrain, and reduce the impact on the marine ecology. In addition, the plastic layer 212 has excellent corrosion resistance, which can extend the service life of the light submarine cable 10 in seawater, reduce the frequency of maintenance and replacement, and help reduce costs and improve production efficiency.

[0050] In a possible implementation, the plastic layer 212 may be configured as a fiber-reinforced composite layer, which is composed of a fiber-reinforced composite material. By adding fiber materials such as glass fiber, carbon fiber, aramid fiber, etc. to the plastic, the strength, rigidity and heat resistance of the plastic layer 212 can be further improved while maintaining its lightweight characteristics. The fiber-reinforced composite layer can provide higher tensile strength and bending rigidity than the pure plastic layer 212, can effectively resist chemical erosion and physical wear in the marine environment, further improve the stability of the armor layer in the chemical environment, and extend the service life of the armor layer.

[0051] Of course, the plastic layer 212 can also be replaced by materials such as polyvinyl chloride, polyethylene and polypropylene, as long as they have good strength, flexibility, wear resistance and corrosion resistance. This embodiment does not impose any specific restrictions on this.

[0052] In addition, the ratio of the steel wire core 211 to the plastic layer 212 in the plastic-coated steel wire 210 can be set according to actual production requirements, and this embodiment does not impose any specific restrictions. For example, the thickness of the plastic layer 212 can be set between 0.4 and 0.6 mm.

[0053] A plurality of plastic-coated steel wires 210 are spirally twisted to form the armor layer 200, and the twist pitch can be set to 15 to 20 times the outer diameter. The twist pitch refers to the axial distance required for the spiral plastic-coated steel wire 210 to complete a complete 360-degree rotation in the twisted structure. In this way, it can be ensured that the armor layer 200 provides sufficient tensile strength and lateral pressure resistance for the light submarine cable 10, and at the same time, the circular shape of the light submarine cable 10 can be maintained to prevent the light submarine cable 10 from being deformed under the action of external forces.

[0054] In addition, in order to prevent water penetration, the gaps between the multiple plastic-coated steel wires 210 may be filled with water-blocking materials. For example, modified asphalt with high viscosity may be used to coat the gaps between the plastic-coated steel wires 210 to ensure the stability and reliability of the light submarine cable 10 during use and extend the service life of the light submarine cable 10.

[0055] In a possible implementation, the armor layer 200 may be provided with multiple layers according to actual production requirements. Figure 1As shown, the armor layers 200 can be stacked in sequence from the inside to the outside to further improve the tensile strength of the light submarine cable 10.

[0056] Reference Figure 1 As shown, a wrapping layer 300 may be provided on the outside of the armor layer 200. The wrapping layer 300 can prevent the armor layer 200 from loosening or shifting during use by tightly wrapping the armor layer 200, thereby ensuring the structural integrity of the light submarine cable 10. Exemplarily, the wrapping layer 300 may be made of a high-strength cloth tape with excellent tensile strength and wear resistance, and is firmly tied to the outside of the armor layer 200 to improve the activity strength and stability of the light submarine cable 10. Exemplarily, the high-strength cloth bag may be made of materials such as aramid fiber cloth tape or polyester fiber cloth tape.

[0057] Continue to refer to Figure 1 The light submarine cable 10 further includes an inner sheath 400, which is disposed between the optical fiber unit 100 and the armor layer 200 to prevent moisture penetration and prevent wear of the optical fiber unit 100. The inner sheath 400 may be made of a polymer plastic material having excellent waterproof and wear-resistant properties, such as polyethylene, polyvinyl chloride, etc.

[0058] In a possible implementation, an inner cushion layer may be provided between the inner sheath 400 and the armor layer 200. Since the material of the armor layer 200 is relatively hard, the inner cushion layer may provide an additional barrier between the inner sheath 400 and the armor layer 200, reduce the direct friction between the inner sheath 400 and the armor layer 200, and prevent the armor layer 200 from causing wear to the inner sheath 400 and the optical fiber unit 100. Therefore, the material of the inner cushion layer needs to have good flexibility. For example, the inner cushion layer may be wrapped around the outer side of the inner sheath 400 using a polypropylene rope.

[0059] Of course, in order to increase the corrosion resistance and waterproofness of the light submarine cable 10, the outer surface of the inner cushion layer can also be coated with a layer of high-viscosity modified asphalt.

[0060] Continue to refer to Figure 1 As shown, the light submarine cable 10 further includes an outer sheath 500, which is arranged outside the wrapping layer 300. The outer sheath 500 may be provided with multiple layers, which can buffer the impact of external forces and resist wear, and protect the internal structure from damage. Exemplarily, the outer sheath 500 can be formed by winding a relatively soft polypropylene rope with good chemical resistance and wear resistance, or the outer sheath 500 can also be formed by extruding a polyethylene bag. This embodiment does not impose specific restrictions on this.

[0061] Figure 2 A flowchart of the steps of the method for producing a light submarine cable provided in an embodiment of the present application. Figure 2As shown, the embodiment of the present application also provides a method for producing a light submarine cable, which is used to manufacture the aforementioned light submarine cable 10.

[0062] Specifically, the production method comprises the following steps:

[0063] S100: Form an optical fiber unit, where the optical fiber unit includes at least one optical fiber.

[0064] When forming the optical fiber unit 100, firstly, high-quality, low-loss, high-bandwidth communication optical fibers are selected to ensure the transmission quality of the signal. In order to further protect the optical fiber and enhance its performance in a humid environment, a water-blocking material is filled in the gaps of the optical fiber. For example, a water-blocking fiber paste can be coated in the gaps of the optical fiber.

[0065] Stainless steel or other corrosion-resistant metal materials are selected as the base material to make loose tubes. For example, the metal material is cut into steel strips of appropriate width and placed in a forming mold, and then bent into a tube by mechanical or hydraulic means. Laser welding technology is used to weld the gaps on both sides of the tubular structure to ensure the continuity and sealing of the weld and prevent the intrusion of foreign substances.

[0066] After welding, use appropriate grinding tools such as grinding wheels or polishing machines to grind the surface of the welding area to make the welding surface smooth and eliminate possible burrs or irregular sharp parts.

[0067] After that, the optical fiber is pulled into the loose tube. In addition, the optical fiber pay-off tension during production and the length of the loose tube during molding are adjusted by controlling the parameters on the production line equipment, so that the optical fiber can maintain a certain amount of activity space inside the loose tube. In this way, the loose tube can effectively absorb external stress and vibration, protect the optical fiber from mechanical shock and environmental factors, and ensure the signal stability and reliability of the optical fiber during transmission.

[0068] It is understandable that in order to achieve a better water-blocking effect and prevent water from penetrating, the inner wall of the loose tube may also be coated with a layer of water-blocking fiber paste.

[0069] S200, surround the outer side of the optical fiber unit with at least one armor layer. The armor layer includes: providing a steel wire core; wrapping a plastic layer around the steel wire core to form a plastic-coated steel wire; and spirally twisting a plurality of plastic-coated steel wires outside the optical fiber unit to form the armor layer.

[0070] After the optical fiber unit 100 is formed, an inner sheath 400 is coated on the outside of the optical fiber unit 100. In order to prevent moisture from entering the optical fiber unit 100, thereby preventing the optical fiber from being damp and causing signal attenuation and performance degradation, the inner sheath 400 needs to have excellent waterproof and wear-resistant properties. Exemplarily, the inner sheath 400 can be formed by extruding a layer of polyethylene material on the outside of the optical fiber unit 100 by an extruder. The thickness of the inner sheath 400 can be determined according to the overall tensile strength requirements of the light submarine cable 10, usually between 2.5 and 4 mm.

[0071] In a possible implementation, an inner cushion layer may be coated outside the inner sheath 400 to reduce direct friction between the inner sheath 400 and the armor layer 200, and prevent the armor layer 200 from causing wear to the inner sheath 400 and the optical fiber unit 100. Exemplarily, a polypropylene rope may be wound outside the inner sheath 400 as an inner cushion layer. The polypropylene rope has the characteristics of light weight, high strength and corrosion resistance, so that additional buffering and protection can be provided to the inner sheath 400 and the optical fiber unit 100 without significantly increasing the weight of the light submarine cable 10.

[0072] Afterwards, a steel wire core 211 is provided, and a plastic layer 212 is wrapped around the steel wire core 211 to obtain a plastic-coated steel wire 210. For example, an extruder can be used to uniformly extrude the molten plastic and coat the outside of the steel wire core 211. The thickness of the plastic layer can be selected according to actual production requirements, and the thickness of the plastic layer can usually be set between 0.4 and 0.6 mm. Among them, the plastic layer 212 can be a fiber-reinforced composite layer, polyvinyl chloride, polyethylene, polypropylene and other materials, and this embodiment does not specifically limit this.

[0073] In addition, in order to ensure the roundness of the light submarine cable 10 and prevent seawater from corroding the plastic-coated steel wire 210, a water-blocking material can be filled in the gap of the plastic-coated steel wire 210. For example, a coating device can be used to coat the gap of the plastic-coated steel wire 210 with modified asphalt, which is a material with excellent waterproof and adhesion properties, and can form a solid barrier in the gap of the plastic-coated steel wire 210, effectively preventing seawater from penetrating into the plastic-coated steel wire 210. In addition, the modified asphalt can also slow down the corrosion rate of the steel wire core by seawater and other substances after the plastic layer 212 of the plastic-coated steel wire 210 is destroyed.

[0074] Afterwards, multiple plastic-coated steel wires 210 are manufactured according to the above method, and multiple plastic-coated steel wires 210 are twisted to form the outer side of the inner cushion layer to form the armor layer 200. Specifically, a cage-type twisting machine can be used for twisting. Among them, the twisting pitch can be set to 15 to 20 times of its outer diameter. In this way, it can be ensured that the armor layer 200 has both good lateral pressure resistance and excellent tensile strength.

[0075] Of course, in order to further enhance the mechanical strength and tensile strength of the light submarine cable 10, a multi-layer armor layer 200 structure can be used. Figure 1 As shown, the multi-layer armor layer 200 is stacked in sequence and coated on the outside of the inner cushion layer, so that the multi-layer armor layer 200 can provide higher safety and reliability when the light submarine cable 10 faces a complex marine environment.

[0076] A wrapping layer 300 is wrapped around the armor layer 200, and the wrapping layer 300 is fastened to the outside of the armor layer 200 using a high-strength cloth tape with excellent tensile strength and wear resistance to prevent the armor layer 200 from loosening or shifting during use. For example, an aramid fiber cloth tape or a polyester fiber cloth tape can be used as the wrapping layer 300.

[0077] The outer sheath 500 is coated on the outer surface of the wrapping layer 300 to provide buffer protection for the light submarine cable 10 during circulation, transportation, and construction. The outer sheath 500 can be formed by winding a polypropylene rope. Alternatively, the outer sheath 500 can also be formed by extruding a polyethylene material onto the surface of the armor layer 200 through an extrusion process. This embodiment does not specifically limit this.

[0078] The outer sheath 500 can be provided with multiple layers, and water-blocking asphalt can be coated between each two adjacent outer sheath layers 500. In this way, the waterproof performance of the light submarine cable 10 can be effectively improved, and the overall corrosion resistance of the light submarine cable 10 can be enhanced, which is beneficial to extending the service life of the light submarine cable 10.

[0079] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0080] It should be noted that the embodiments represented by "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments", etc. mentioned in the specification may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, such phrases do not necessarily refer to the same embodiment. In addition, when describing specific features, structures or characteristics in conjunction with an embodiment, it is within the knowledge of those skilled in the art to implement such features, structures or characteristics in conjunction with other embodiments that are explicitly or not explicitly described.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A lightweight submarine cable, characterized in that: include: An optical fiber unit (100) comprising at least one optical fiber; At least one armor layer (200) surrounds the outer side of the optical fiber unit (100); the armor layer (200) includes a plurality of spirally twisted plastic-coated steel wires (210), and the plastic-coated steel wires include a steel wire core (211) and a plastic layer (212) wrapped around the steel wire core (211).

2. The light submarine cable according to claim 1, characterized in that: The plastic layer (212) is a fiber-reinforced composite layer.

3. The light submarine cable according to claim 1, characterized in that: The armor layer (200) comprises at least two layers, and the armor layers (200) are stacked in sequence from the inside to the outside.

4. The light submarine cable according to claim 1, characterized in that: The gaps between the plastic-coated steel wires (210) are filled with water-blocking material.

5. The light submarine cable according to any one of claims 1 to 3, characterized in that: The optical fiber unit (100) comprises a plurality of optical fibers, each of the optical fibers is twisted in a spiral, and the optical fiber unit (100) further comprises a loose tube sleeved outside all the optical fibers; Wherein, the gaps between the optical fibers and the gaps between the optical fibers and the loose tube are filled with water-blocking fiber paste.

6. The light submarine cable according to any one of claims 1 to 3, characterized in that: Also includes: An inner protective layer (400) is arranged between the optical fiber unit (100) and the armor layer (200).

7. The light submarine cable according to claim 6, characterized in that: Also includes: At least one outer protective layer (500) surrounds the outer side of the armor layer (200).

8. The light submarine cable according to claim 7, characterized in that: Also includes: The wrapping layer (300) is arranged between the armor layer (200) and the outer protective layer.

9. A method for producing a light submarine cable, applied to the light submarine cable according to any one of claims 1 to 8, characterized in that: The production method comprises: forming an optical fiber unit (100), the optical fiber unit (100) comprising at least one optical fiber; At least one armor layer (200) is surrounded on the outside of the optical fiber unit (100); Wherein, forming the armor layer (200) comprises: Providing a steel wire core (211); A plastic layer (212) is wrapped around the steel wire core (211) to form a plastic-coated steel wire (210); A plurality of the plastic-coated steel wires (210) are spirally twisted outside the optical fiber unit (100) to form the armor layer (200).

10. The production method according to claim 9, characterized in that: After forming the armor layer (200), the method further comprises: The gaps between the plastic-coated steel wires (210) are filled with water-blocking material.

11. The production method according to claim 9, characterized in that: The optical fiber unit (100) comprises a plurality of optical fibers, and forming the optical fiber unit (100) comprises: pulling each of the optical fibers; Loose tubes are arranged outside all the optical fibers, and water-blocking fiber paste is filled in the gaps between the optical fibers and the gaps between the optical fibers and the loose tubes.

12. The production method according to claim 9, characterized in that: After the armor layer (200) is surrounded on the outside of the optical fiber unit (100), the method further comprises: Winding the outer side of the armor layer (200) to form a wrapping layer (300); At least one outer protective layer (500) is formed by winding the wrapping layer (300).

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