Optical cable pay-off tension control method and system for photoelectric composite submarine cable cabling

Abstract

The application belongs to the technical field of submarine cables, and particularly relates to a method and system for optical cable pay-off tension control for optical and electrical composite submarine cable cabling, wherein a control unit is used to control an optical cable pay-off reel to reduce tension, and meanwhile, the production speed of a cabling machine is controlled to be reduced, and the biggest advantage of reducing the production speed of the cabling machine is to ensure stability; the cabling speed is reduced by a lower speed, that is, the cabling winding speed is reduced, and in the case that the cable speed of the upstream supply is still relatively high, the tension of the cable as a whole at the end is quickly relieved, and then the tension is transmitted to the upstream to relieve and reduce the tension of the cable as a whole, and meanwhile, the speed can be reduced to improve production stability, and the optical cable pay-off reel is controlled to reduce tension, and the tension relief at a higher speed is performed from the pay-off end of the upstream, so that bidirectional tension relief between the optical cable pay-off reel and the cabling machine is realized, and thus the stress relief of the optical cable is accelerated, so as to reduce the problem that the tension adjustment is not timely due to the delay of the tension adjustment of the pay-off reel.

Description

Technical Field

[0001] This invention belongs to the field of submarine cable technology, specifically relating to a method and system for controlling the tension of optical cable laying in the cabling of optoelectronic composite submarine cables. Background Technology

[0002] Long-length fiber optic composite submarine cables are typically tens of kilometers long, with some projects reaching hundreds of kilometers. Among the various components used in the cable-making process, the fiber optic cable has a relatively small diameter and is relatively fragile. It is prone to damage or even breakage under stress, which can affect the stability and quality of the fiber optic composite submarine cable.

[0003] It should be noted that this part of the present invention only provides background technology related to the present invention, and does not necessarily constitute prior art or known technology. Summary of the Invention

[0004] The purpose of this invention is to provide a method and system for controlling the tension of optical cable laying during the cabling of optoelectronic composite submarine cables, so as to solve the problem that the optical cable is easily damaged by stress during the existing cable cabling process, which affects the stability and quality of the cable.

[0005] To achieve the above objectives, firstly, a method for controlling the tension of optical cable laying in the cabling of optoelectronic composite submarine cables is provided, comprising:

[0006] Load the optical cable and the submarine cable to be installed into the preset position of the cable-laying equipment;

[0007] Start the cabling equipment and use an optical time domain reflectometer to detect the attenuation loss of the optical cable in real time;

[0008] Generate a corresponding real-time loss curve based on the attenuation loss amount;

[0009] Based on the comparison between the real-time loss curve and the preset loss curve, the fiber optic cable tension and cabling speed are adjusted. The preset loss curve is a stable curve. Specifically, when the slope of the real-time loss curve is detected to be within the first slope range, the fiber optic cable tension of the cabling equipment is reduced by 3% to 8% per reduction, with a single adjustment time of 3 to 8 seconds. The cabling speed is also reduced by 2% to 4% per reduction, with a single adjustment time of 3 to 8 seconds. When the slope of the real-time loss curve is detected to be within the second slope range, the reduction of the fiber optic cable tension is stopped, and the cabling speed is gradually restored, with a single increase of 1% per increase, with a single adjustment time of 3 to 8 seconds, until the original set cabling speed is restored. The second slope range corresponds to the normal range of the preset loss curve, and the first slope range is greater than the second slope range.

[0010] Optionally, when the slope of the real-time loss curve is detected to be within the third slope range, the alarm device is controlled to issue an alarm signal, and the optical cable laying mechanism of the cabling equipment is controlled to reduce the optical cable laying tension by 8% to 12% per second, and the cabling mechanism of the cabling equipment is controlled to slowly stop operating; wherein, the third slope range is greater than the first slope range, and the attenuation loss corresponding to the real-time loss curve exceeds the normal level by 20% to 25%.

[0011] Optionally, controlling the speed at which the cabling mechanism of the cabling equipment slowly stops operating includes controlling the cabling mechanism of the cabling equipment to reduce its speed by 4% to 6% per second until it stops.

[0012] Optionally, when the slope of the real-time loss curve is detected to be within the fourth slope range, the cabling equipment is not allowed to start, or if it is already started, the fiber optic cable tension is reduced at a preset speed and the cabling equipment is slowly stopped; wherein, the fourth slope range is greater than the third slope range, and the attenuation loss corresponding to the real-time loss curve exceeds the limit attenuation threshold.

[0013] Optionally, the cable forming equipment further includes an optical cable tension adjustment mechanism, which includes a first multi-groove guide wheel and a second multi-groove guide wheel spaced apart in a vertical direction. The first multi-groove guide wheel is driven to rise and fall by a first drive mechanism, and the second multi-groove guide wheel is driven to rise and fall by a second drive mechanism. The cable formed by the optical cable release mechanism is wound around the first multi-groove guide wheel and the second multi-groove guide wheel, and the transmission tension of the optical cable is adjusted by controlling the distance between the first multi-groove guide wheel and the second multi-groove guide wheel.

[0014] Optionally, when the slope of the real-time loss curve is detected to be within the first slope range, the optical cable laying mechanism of the cabling equipment is controlled to reduce the optical cable laying tension, while the first drive mechanism and the second drive mechanism are controlled to move slowly to gradually reduce the vertical spacing between the first multi-groove guide wheel and the second multi-groove guide wheel.

[0015] Optionally, the speed at which the gap between the first multi-groove guide wheel and the second multi-groove guide wheel decreases is controlled to be 0.5cm~1cm / s.

[0016] Optionally, when the slope of the real-time loss curve is detected to be within the second slope range, while stopping the reduction of the optical cable laying tension of the optical cable laying mechanism, the first drive mechanism and the second drive mechanism are controlled to move slowly to gradually increase the vertical spacing between the first multi-groove guide wheel and the second multi-groove guide wheel.

[0017] Optionally, the speed at which the gap between the first multi-groove guide wheel and the second multi-groove guide wheel increases is controlled to be between 0.5 cm and 1 cm / s.

[0018] Optionally, the limiting attenuation threshold is 0.21dB / km@1550nm or 0.35dB / km@1310nm.

[0019] Secondly, embodiments of the present invention provide an optical cable tension control system for cable laying in optoelectronic composite submarine cables, comprising:

[0020] Optical cable release mechanism, used to release the optical cable;

[0021] Cable-forming mechanism, used to wind and twist submarine cables and optical cables to form composite submarine cables;

[0022] Optical time domain reflectometer, used to detect the attenuation loss of optical cables;

[0023] The control unit is electrically connected to the optical cable laying mechanism, the cabling mechanism, and the optical time domain reflectometer, respectively. It is used to adjust the optical cable laying tension and cabling speed based on the comparison result between the real-time loss curve and a preset loss curve. The preset loss curve is a stable curve. Specifically, when the control unit detects that the slope of the real-time loss curve is within a first slope range, it controls the optical cable laying mechanism of the cabling equipment to reduce the optical cable laying tension by 3% to 8% per instance, with a single adjustment time of 3 to 8 seconds. It also controls the cabling mechanism of the cabling equipment to reduce the cabling speed by 2% to 4% per instance, with a single adjustment time of 3 to 8 seconds.

[0024] When the control unit detects that the slope of the real-time loss curve is within the second slope range, it stops reducing the optical cable tension of the optical cable laying mechanism and gradually restores the cabling speed of the cabling mechanism. The cabling speed is increased by 1% at a time, and the adjustment time is 3s to 8s, until it is restored to the original set cabling speed. The second slope range corresponds to the normal range of the preset loss curve, and the first slope range is greater than the second slope range.

[0025] The present invention has at least the following beneficial effects:

[0026] The present invention provides a method and system for controlling the tension of optical cable laying in optical-electric composite submarine cables. The control unit controls the optical cable laying reel to reduce tension, while simultaneously reducing the production speed of the cable-laying machine. The greatest advantage of reducing the production speed of the cable-laying machine is ensuring stability. By reducing the cable-laying speed (i.e., reducing the cable winding speed), while the upstream cable supply speed remains relatively high, the overall tension of the cable at the end is quickly relieved, thus transmitting tension upstream to alleviate and reduce the overall tension of the cable. This also reduces the speed, improving production stability, while simultaneously controlling the optical cable laying reel to reduce tension, allowing for higher-speed tension relief from the upstream laying end. This allows for bidirectional tension relief between the fiber optic cable reel and the cabling machine, thereby accelerating stress relief in the fiber optic cable. This reduces the problem of untimely tension adjustment caused by delays in tension adjustment due to the reel's tension adjustment, which can lead to discrepancies between the actual strain and the measured strain, resulting in a delay in tension adjustment. By reducing the cabling speed to a smaller extent than the tension reduction of the reel, the cable tension adjustment process is stabilized, maintaining production stability. Simultaneously, overall cable tension relief and rapid fiber optic cable tension relief are achieved, which helps improve the stability and controllability of tension during the fiber optic and submarine cable cabling process, thereby enhancing the stability of fiber optic and submarine cable cabling and ultimately improving the quality of the cabled products. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 This is an overall structural diagram of a cable-making device provided in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the module connection of an optical cable tension control system for optical-electric composite submarine cable assembly provided in an embodiment of the present invention;

[0030] Figure 3 This is provided by the embodiments of the present invention. Figure 1 A magnified view of a portion of the image;

[0031] Figure 4 This is a flowchart illustrating a method for controlling the tension of optical cable laying in the fabrication of optoelectronic composite submarine cables, provided by an embodiment of the present invention. Detailed Implementation

[0032] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0033] It will be understood by those skilled in the art that, unless otherwise defined, all terms used herein (including technical and scientific terms) have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. It should also be understood that terms such as those defined in general dictionaries should be understood to have the same meaning as in the context of the prior art, and should not be interpreted in an idealized or overly formal sense unless specifically defined as herein.

[0034] It should be further understood that the term "comprising" as used in this specification means the presence of the stated features, integers, steps, operations, elements, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof. The term "and / or" as used herein includes all or any unit and all combinations of one or more associated listed items.

[0035] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides an optical cable laying tension control system for optical-electric composite submarine cable assembly. The optical cable laying tension control system is based on submarine cable assembly equipment and specifically includes: an optical cable laying mechanism 100, an assembly mechanism 200, an optical time domain reflectometer 300, and a control unit 400.

[0036] Specifically, the optical cable laying mechanism 100 is used to release the optical cable. The laying tension of the optical cable can be adjusted by adjusting the laying speed of the optical cable laying mechanism 100. The cabling mechanism 200 is used to twist (wind) the cabled submarine cable and optical cable to form a composite submarine cable. The cabling stability can be ensured by adjusting the rotation speed of the cabling mechanism 200.

[0037] Furthermore, the optical time-domain reflectometer 300 (OTDR) is used to detect the attenuation loss of the optical cable. Parameters such as initial tension can be preset according to cabling requirements and dynamically adjusted subsequently based on the detected attenuation loss. The control unit 400 can be a computer acting as a host computer, or a PLC control module or other control components, as long as they can perform the corresponding functions. The control unit 400 is electrically connected to the optical cable laying mechanism 100, the cabling mechanism 200, and the optical time-domain reflectometer 300, respectively, and is used to adjust the optical cable laying tension and cabling speed based on the comparison result between the real-time loss curve and the preset loss curve. The preset loss curve is a stable curve, meaning that the slope of the curve changes relatively gently, and the loss fluctuation between adjacent time intervals is small.

[0038] Optionally, when the control unit 400 detects that the slope of the real-time loss curve is within the first slope range, it controls the optical cable laying mechanism 100 of the cabling equipment to reduce the optical cable laying tension, with a single reduction in tension of 3% to 8% and a single adjustment time of 3 to 8 seconds; and controls the cabling mechanism 200 of the cabling equipment to reduce the cabling speed, with a single reduction in speed of 2% to 4% and a single adjustment time of 3 to 8 seconds. It is understood that the slope of the real-time loss curve is determined by the line connecting the current attenuation loss and the attenuation loss in the previous detection period.

[0039] Optionally, when the control unit 400 detects that the slope of the real-time loss curve is within the second slope range, it stops reducing the optical cable tension of the optical cable laying mechanism 100 and gradually restores the cabling speed of the cabling mechanism 200. The cabling speed is increased by 1% at a time, and the adjustment time is 3s to 8s, until it is restored to the original set cabling speed. The second slope range corresponds to the normal range of the preset loss curve, and the first slope range is greater than the second slope range.

[0040] Optionally, please continue reading Figure 1 and Figure 3The cable forming equipment further includes an optical cable tension adjustment mechanism 500. The optical cable tension adjustment mechanism 500 includes a first multi-groove guide wheel and a second multi-groove guide wheel spaced apart vertically. The first multi-groove guide wheel is driven to rise and fall by a first drive mechanism 510, and the second multi-groove guide wheel is driven to rise and fall by a second drive mechanism 520. The cable released by the optical cable laying mechanism 100 is wound around the first and second multi-groove guide wheels. The control unit 400 adjusts the transmission tension of the optical cable by controlling the distance between the first and second multi-groove guide wheels. That is, by adjusting the vertical distance between the two multi-groove guide wheels, the tension during the optical cable transmission process (the entire optical cable is relatively long) can be adjusted. A larger distance corresponds to a larger tension (tight state), and a smaller distance corresponds to a smaller tension (relaxed state).

[0041] Based on the same inventive concept, such as Figure 4 As shown, a method for controlling the tension of optical cable laying in optoelectronic composite submarine cable assembly is provided. Based on the optical cable laying tension control system for optoelectronic composite submarine cable assembly described in the foregoing embodiments, the optical cable laying tension control method includes steps S100~S400:

[0042] S100, loads the optical cable and the submarine cable to be installed into the preset position of the cable-laying equipment;

[0043] S200, start the cabling equipment and use the optical time domain reflectometer 300 to detect the attenuation loss of the optical cable in real time;

[0044] S300, the control unit 400 generates a corresponding real-time loss curve based on the attenuation loss amount;

[0045] S400, the control unit 400 adjusts the fiber optic cable laying tension and cabling speed according to the comparison result between the real-time loss curve and the preset loss curve; the preset loss curve is a stable curve.

[0046] Optionally, when the control unit 400 detects that the slope of the real-time loss curve is within the first slope range (the loss curve corresponding to the first slope range slowly rises, and the slow rise of the curve is based on the fact that as the actual diameter of the optical cable winding in the cable reel decreases during the production process, the torque becomes shorter and the tension increases. Although the automatic control system calculates the degree of tension change by inputting a series of data such as the outer diameter of the optical cable and the production length, there will still be deviations in reality, resulting in the tension not meeting the expected control target and the phenomenon of slow rise of the curve), it is necessary to control the optical cable laying mechanism 100 of the cabling equipment to reduce the optical cable laying tension. The reduction in optical cable laying tension in a single operation is 3% to 8%, and the adjustment time in a single operation is 3s to 8s. It is also necessary to control the cabling mechanism 200 of the cabling equipment to reduce the cabling speed. The reduction in cabling speed in a single operation is 2% to 4%, and the adjustment time in a single operation is 3s to 8s.

[0047] Optionally, when the control unit 400 detects that the slope of the real-time loss curve is within the second slope range (the loss curve corresponding to the second slope range shows a significant step-like increase (generally, the loss increases by 20%), the reason for the rapid rise of this curve is that the optical cable is not properly secured, the tension of the cable reel is faulty, or there is a mechanical failure), it is necessary to stop reducing the optical cable tension of the optical cable laying mechanism 100 and gradually restore the cabling speed of the cabling mechanism 200. The cabling speed is increased by 1% at a time, and the adjustment time is 3s to 8s, until the original set cabling speed is restored. The second slope range corresponds to the normal range of the preset loss curve, and the first slope range is greater than the second slope range.

[0048] Optionally, when the control unit 400 detects that the slope of the real-time loss curve is within the third slope range, it controls the alarm device to issue an alarm signal, and simultaneously controls the optical cable laying mechanism 100 of the cabling equipment to reduce the optical cable laying tension by 8% to 12% per second, and controls the cabling mechanism 200 of the cabling equipment to slowly stop operating; wherein, the third slope range is greater than the first slope range, and the attenuation loss corresponding to the real-time loss curve exceeds the normal level by 20% to 25%.

[0049] Optionally, controlling the speed at which the cable-forming mechanism 200 of the cable-forming equipment slowly stops operating includes controlling the cable-forming mechanism 200 of the cable-forming equipment to decrease its speed by 4% to 6% per second until it stops.

[0050] Optionally, when the control unit 400 detects that the slope of the real-time loss curve is within the fourth slope range, the cabling equipment is not allowed to start, or if it is already started, the optical cable tension is reduced at a preset speed and the cabling equipment is slowly stopped; wherein, the fourth slope range is greater than the third slope range, and the attenuation loss corresponding to the real-time loss curve exceeds the limit attenuation threshold.

[0051] Understandably, a relatively constant tension ensures that the optical cable will not jump out of the cable groove due to insufficient tension; while excessive tension will lead to increased optical cable loss. In general production, the tension will increase because the center of gravity is smaller and the torque is smaller. Therefore, it is necessary to adjust (reduce) the tension in time to meet the stability requirements of cable formation and at the same time reduce optical cable loss.

[0052] Optionally, the cabling equipment further includes an optical cable tension adjustment mechanism 500, which includes a first multi-groove guide wheel and a second multi-groove guide wheel spaced apart in a vertical direction. The first multi-groove guide wheel is driven to rise and fall by a first drive mechanism 510, and the second multi-groove guide wheel is driven to rise and fall by a second drive mechanism 520. The cable released by the optical cable release mechanism 100 is wound around the first multi-groove guide wheel and the second multi-groove guide wheel. The control unit 400 adjusts the transmission tension of the optical cable by controlling the distance between the first multi-groove guide wheel and the second multi-groove guide wheel.

[0053] Optionally, in step S400, when the control unit 400 detects that the slope of the real-time loss curve is within the first slope range, it controls the optical cable laying mechanism 100 of the cabling equipment to reduce the optical cable laying tension, while controlling the first drive mechanism 510 and the second drive mechanism 520 to move slowly, so as to gradually reduce the vertical distance between the first multi-groove guide wheel and the second multi-groove guide wheel.

[0054] Optionally, the speed at which the gap between the first multi-groove guide wheel and the second multi-groove guide wheel decreases is controlled at 0.5cm~1cm / s. The speed at which the gap decreases should not be too fast, otherwise it will cause a sudden drop in tension and affect the cable formation effect.

[0055] Optionally, in step S400, when the control unit 400 detects that the slope of the real-time loss curve is within the second slope range, it stops reducing the optical cable tension of the optical cable laying mechanism 100 and controls the first drive mechanism 510 and the second drive mechanism 520 to move slowly to gradually increase the vertical spacing between the first multi-groove guide wheel and the second multi-groove guide wheel.

[0056] Optionally, the speed at which the gap between the first multi-groove guide wheel and the second multi-groove guide wheel increases is controlled at 0.5cm~1cm / s. The speed at which the gap increases should not be too fast, otherwise it will cause a sudden increase in tension and lead to problems such as fiber optic cable breakage.

[0057] This embodiment, by adding an optical cable tension adjustment mechanism 500, can simultaneously control the upper and lower guide wheels to slowly move away from the auxiliary tension increase when it is necessary to tighten the tension of the cable reel. The control speed is generally about 0.5cm~1cm / s, so that the tension is adjusted quickly and the auxiliary tension is closer to the upper cable forming position. This avoids the delay in the transmission of the optical cable reel tension adjustment to the cable forming machine due to the large distance between the optical cable reel and the cable forming machine, which helps to alleviate problems such as lag.

[0058] Optionally, the limiting attenuation threshold is 0.21dB / km@1550nm or 0.35dB / km@1310nm.

[0059] The present invention provides a method and system for controlling the tension of optical cable laying in optical-electric composite submarine cables. The control unit 400 controls the optical cable laying reel to reduce tension, while simultaneously reducing the production speed of the cable-laying machine. The greatest advantage of reducing the production speed of the cable-laying machine is ensuring stability. By reducing the cable-laying speed (i.e., reducing the cable winding speed), while the upstream cable supply speed remains relatively high, the overall tension of the cable at the end is quickly relieved, thus transmitting tension upstream to alleviate and reduce the overall tension of the cable. This also reduces speed, improves production stability, and simultaneously controls the optical cable laying reel to reduce tension, allowing for higher-speed tension easing from the upstream laying end. This solution enables bidirectional tension relief between the fiber optic cable reel and the cabling machine, thereby accelerating stress relief in the fiber optic cable. This reduces the problem of untimely tension adjustment caused by delays in tension adjustment due to the reel's tension adjustment, which can lead to discrepancies between the actual strain and the measured strain, resulting in a delay in tension adjustment. By reducing the cabling speed to a smaller extent than the tension reduction of the reel, the cable tension adjustment process is stabilized, maintaining production stability. Simultaneously, overall cable tension relief and rapid fiber optic cable tension relief are achieved, which helps improve the stability and controllability of tension during the fiber optic and submarine cable cabling process, thereby enhancing the stability of fiber optic and submarine cable cabling and ultimately improving the quality of the finished products.

[0060] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0061] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0062] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances. In the description of this specification, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0063] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions 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 invention.

Claims

1. A method for controlling the tension of optical cable laying in the cabling of optoelectronic composite submarine cables, characterized in that, include: Load the optical cable and the submarine cable to be installed into the preset position of the cable-laying equipment; Start the cabling equipment and use an optical time domain reflectometer to detect the attenuation loss of the optical cable; Generate a corresponding real-time loss curve based on the attenuation loss amount; Based on the comparison between the real-time loss curve and the preset loss curve, the fiber optic cable tension and cabling speed are adjusted; the preset loss curve is a stable curve. Specifically, when the slope of the real-time loss curve is detected to be within the first slope range, the optical cable laying mechanism of the cabling equipment is controlled to reduce the optical cable laying tension, with a single reduction in optical cable laying tension of 3% to 8% and a single adjustment time of 3s to 8s; and the cabling mechanism of the cabling equipment is controlled to reduce the cabling speed, with a single reduction in cabling speed of 2% to 4% and a single adjustment time of 3s to 8s. When the slope of the real-time loss curve is detected to be within the second slope range, the reduction of the optical cable tension of the optical cable laying mechanism is stopped, and the cabling speed of the cabling mechanism is gradually restored. The cabling speed is increased by 1% at a time, and the adjustment time is 3s to 8s, until the original set cabling speed is restored. The second slope range corresponds to the normal range of the preset loss curve, and the first slope range is greater than the second slope range.

2. The optical cable tension control method according to claim 1, characterized in that, When the slope of the real-time loss curve is detected to be within the third slope range, the control alarm device issues an alarm signal, and at the same time controls the optical cable laying mechanism of the cabling equipment to reduce the optical cable laying tension by 8% to 12% per second, and controls the cabling mechanism of the cabling equipment to slowly stop operating; wherein, the third slope range is greater than the first slope range, and the attenuation loss corresponding to the real-time loss curve exceeds the normal level by 20% to 25%.

3. The optical cable tension control method according to claim 2, characterized in that, Controlling the speed at which the cable-forming mechanism of the cable-forming equipment slowly stops operating includes: The cable-forming mechanism of the cable-forming equipment is controlled to decrease its speed by 4% to 6% per second until it stops.

4. The optical cable tension control method according to claim 2, characterized in that, When the slope of the real-time loss curve is detected to be within the fourth slope range, the cabling equipment is not allowed to start, or if it is already started, the fiber optic cable tension is reduced at a preset speed and the cabling equipment is slowly stopped; wherein, the fourth slope range is greater than the third slope range, and the attenuation loss corresponding to the real-time loss curve exceeds the limit attenuation threshold.

5. The optical cable tension control method according to any one of claims 1 to 4, characterized in that, The cable forming equipment also includes an optical cable tension adjustment mechanism, which includes a first multi-groove guide wheel and a second multi-groove guide wheel spaced apart in the vertical direction. The first multi-groove guide wheel is driven to rise and fall by a first drive mechanism, and the second multi-groove guide wheel is driven to rise and fall by a second drive mechanism. The optical cable released by the optical cable release mechanism is wound around the first multi-groove guide wheel and the second multi-groove guide wheel. The transmission tension of the optical cable is adjusted by controlling the distance between the first multi-groove guide wheel and the second multi-groove guide wheel.

6. The optical cable tension control method according to claim 5, characterized in that, When the slope of the real-time loss curve is detected to be within the first slope range, the optical cable laying mechanism of the cabling equipment is controlled to reduce the optical cable laying tension, while the first drive mechanism and the second drive mechanism are controlled to move slowly to gradually reduce the vertical distance between the first multi-groove guide wheel and the second multi-groove guide wheel.

7. The optical cable tension control method according to claim 6, characterized in that, The speed at which the gap between the first multi-groove guide wheel and the second multi-groove guide wheel decreases is controlled between 0.5cm and 1cm / s.

8. The optical cable tension control method according to claim 5, characterized in that, When the slope of the real-time loss curve is detected to be within the second slope range, the reduction of the optical cable tension of the optical cable laying mechanism is stopped, and the first drive mechanism and the second drive mechanism are controlled to move slowly to gradually increase the vertical spacing between the first multi-groove guide wheel and the second multi-groove guide wheel.

9. The optical cable tension control method according to claim 8, characterized in that, The speed at which the gap between the first multi-groove guide wheel and the second multi-groove guide wheel increases is controlled between 0.5cm and 1cm / s.

10. A tension control system for optical cable laying in the fabrication of optoelectronic composite submarine cables, characterized in that, include: Optical cable release mechanism, used to release the optical cable; Cable-forming mechanism, used to wind and twist submarine cables and optical cables to form composite submarine cables; Optical time domain reflectometer, used to detect the attenuation loss of optical cables; The control unit is electrically connected to the optical cable laying mechanism, the cabling mechanism, and the optical time domain reflectometer, and is used to adjust the optical cable laying tension and cabling speed according to the comparison result of the real-time loss curve and the preset loss curve; the preset loss curve is a stable curve. Specifically, when the control unit detects that the slope of the real-time loss curve is within the first slope range, it controls the optical cable laying mechanism to reduce the optical cable laying tension, with a single reduction in optical cable laying tension of 3% to 8% and a single adjustment time of 3s to 8s; and controls the cabling mechanism to reduce the cabling speed, with a single reduction in cabling speed of 2% to 4% and a single adjustment time of 3s to 8s. When the control unit detects that the slope of the real-time loss curve is within the second slope range, it stops reducing the optical cable tension of the optical cable laying mechanism and gradually restores the cabling speed of the cabling mechanism. The cabling speed is increased by 1% at a time, and the adjustment time is 3s to 8s, until it is restored to the original set cabling speed. The second slope range corresponds to the normal range of the preset loss curve, and the first slope range is greater than the second slope range.

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