Hollow-core optical fiber composite cable for backbone communication network

Abstract

The utility model relates to a hollow-core optical fiber composite cable for a backbone communication network. The hollow-core optical fiber and the solid-core optical fiber are located in a closed space in the outer sheath, the metal detection silk screens are arranged in the outer sheath at intervals, the detection ring wraps the outer sheath, the temperature difference power source is arranged on the detection ring and electrically connected with a detection circuit in the detection ring, and a gap exists between every two adjacent metal detection silk screens. And the detection ring is electrically connected with the two adjacent metal detection silk screens. According to the hollow-core optical fiber composite cable for the backbone communication network disclosed by the invention, the damage position of the composite cable can be found in combination with an active detection mode and a segmented detection mode, and the processing mode can preposition the found problem, so that further permeation of water vapor is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of data communication equipment, in particular to a hollow optical fiber composite cable for backbone communication network. BACKGROUND

[0002] The hollow optical fiber composite cable is a data transmission cable integrating solid optical fiber and hollow optical fiber. The hollow optical fiber has the advantages of extremely low delay (the speed of light in air is only about 0.1% slower than in vacuum, and about 50% faster than traditional optical fiber), nearly zero nonlinearity and strong anti-interference (not sensitive to environmental factors such as radiation and temperature change).

[0003] However, one inherent defect of the hollow optical fiber is that water vapor and carbon dioxide in the air can form strong absorption peaks in specific infrared bands, directly affecting data transmission. Therefore, waterproofing and moisture-proofing need to be paid special attention during laying.

[0004] Current waterproofing and moisture-proofing measures include increasing coating and separation layers, and using dry materials to prevent water vapor from entering. However, these methods are passive measures and cannot determine the protection effect. Problems can only be found through daily inspection or when data transmission anomalies are found. However, the hollow optical fiber composite cable is often laid underground, making daily inspection difficult, and processing delays may occur when data transmission anomalies are processed. CONTENT OF THE INVENTION

[0005] The present application provides a hollow optical fiber composite cable for backbone communication network, which can actively detect and find the damaged position of the composite cable by combining active detection with segmented detection. This processing method can discover problems in advance and prevent further water vapor penetration.

[0006] The above object of the present application is achieved by the following technical solution:

[0007] The present application provides a hollow optical fiber composite cable for backbone communication network, comprising:

[0008] an outer sheath;

[0009] a hollow optical fiber and a solid optical fiber, both located in a sealed space inside the outer sheath;

[0010] a plurality of metal detection wire meshes, spaced apart inside the outer sheath, with gaps between adjacent metal detection wire meshes;

[0011] a detection ring, coated on the outer sheath, electrically connected to two adjacent metal detection wire meshes;

[0012] a thermoelectric power source, provided on the detection ring and electrically connected to a detection circuit inside the detection ring.

[0013] In a possible implementation of the present application, the reinforcing cable is arranged at a middle position of the sealed space inside the outer sheath, and the hollow optical fiber and the solid optical fiber are arranged around the reinforcing cable.

[0014] In a possible implementation of the present application, the detection ring comprises:

[0015] a first half ring and a second half ring;

[0016] a detection circuit arranged inside the first half ring or the second half ring;

[0017] wherein the thermoelectric power supply is arranged inside the first half ring or the second half ring.

[0018] In a possible implementation of the present application, the detection circuit comprises:

[0019] a current generating unit configured to send a detection current to the metal detection wire screen connected by electricity;

[0020] a resistance detection unit configured to detect the resistance of the metal detection wire screen connected by electricity;

[0021] a rechargeable battery connected by electricity to the current generating unit and the resistance detection unit.

[0022] In a possible implementation of the present application, the number of the current generating unit and the resistance detection unit is two.

[0023] In a possible implementation of the present application, further comprising two switching switches connected by electricity to the current generating unit and the resistance detection unit respectively;

[0024] the switching switches are connected by electricity to two adjacent metal detection wire screens.

[0025] In a possible implementation of the present application, the first surface of the thermoelectric power supply is attached to the outer sheath, and the second surface is attached to the detection ring.

[0026] In a possible implementation of the present application, the detection ring is further provided with a heat dissipation fin.

[0027] The present application has the following technical effects:

[0028] The present application provides a hollow optical fiber composite cable for backbone communication network, which uses segmented metal detection wire screen for position detection and water vapor intrusion detection. This way can provide intrusion position reference while detecting water vapor intrusion, which facilitates quick positioning of the intrusion position. The detection scenario at this time is that the outer sheath is damaged but does not affect the optical fiber in the internal space temporarily, which can make the problem be discovered in advance and take timely measures to govern the leakage position. BRIEF DESCRIPTION OF DRAWINGS

[0029] Figure 1 is a cross-sectional view of a hollow optical fiber composite cable for a backbone communication network provided by the present application.

[0030] Figure 2 is a schematic view of the deployment position of a metal detection wire mesh and a detection ring provided by the present application.

[0031] Figure 3 is a schematic block diagram of the structure of a detection circuit provided by the present application.

[0032] Figure 4 is a schematic block diagram of the structure of another detection circuit provided by the present application.

[0033] Figure 5 is a schematic view of the position of a thermoelectric power source provided by the present application.

[0034] In the figure, 1 is an outer sheath, 2 is a hollow optical fiber, 3 is a solid core optical fiber, 4 is a metal detection wire mesh, 5 is a detection ring, 6 is a thermoelectric power source, 11 is a reinforcing cable, 51 is a first half ring, 52 is a second half ring, 53 is a detection circuit, 54 is a heat dissipation fin, 531 is a current generating unit, 532 is a resistance detection unit, 533 is a rechargeable battery, and 534 is a switch. DETAILED DESCRIPTION

[0035] The technical solutions in the present application are further described in detail below with reference to the accompanying drawings.

[0036] The present application discloses a hollow optical fiber composite cable for a backbone communication network. In some examples, the hollow optical fiber composite cable for a backbone communication network disclosed by the present application includes an outer sheath 1, a hollow optical fiber 2, a solid core optical fiber 3, a metal detection wire mesh 4, a detection ring 5, and a thermoelectric power source 6. Please refer to Figure 1 The hollow optical fiber 2 and the solid core optical fiber 3 (using 654E optical fiber) are both located in a sealed space inside the outer sheath 1.

[0037] The base material of the outer sheath 1 is a synthetic polymer material (polyvinyl chloride, polyethylene, cross-linked polyethylene, etc.), and auxiliary ingredients (plasticizer, stabilizer, flame retardant, etc.) are added according to the specific use scene requirements. In addition, considering the protection performance, a armor layer and a shielding layer can also be added, and the specific number of layers and structure of the outer sheath 1 are not limited in the present application.

[0038] The number of metal detection wire meshes 4 is multiple, and these metal detection wire meshes 4 are arranged at intervals inside the outer sheath 1. There is a gap between adjacent metal detection wire meshes 4, and the width of the gap is controlled at about 3-5 mm.

[0039] The detection ring 5 is wrapped on the outer sheath 1, and at the same time, the detection ring 5 is in contact with two adjacent metal detection wire meshes 4Figure 2 The detection ring 5 is electrically connected to the metal detection wire mesh 4 (dashed line in FIG. 5) and functions to detect the resistance of the metal detection wire mesh 4. The thermoelectric power supply 6 is arranged on the detection ring 5 and is electrically connected to a detection circuit 53 inside the detection ring 5, and functions to supply power to the detection circuit 53.

[0040] It should be noted that the hollow optical fiber composite cable for backbone communication network disclosed in the present application has a general design life of 20-30 years after laying. At present, the power supply life of a lithium sulfonyl chloride battery, for example, is generally 10-15 years (in a micro-power consumption scenario), that is, the battery needs to be replaced 2-3 times, and obviously the use cost of this method is too high.

[0041] The present application uses the principle of thermoelectric power supply 6. The core power supply principle of the thermoelectric power supply 6 is the Seebeck effect. When a loop is formed by two different semiconductors, if there is a temperature difference between the two ends, an electromotive force (voltage) will be generated spontaneously, and then an electric current will be formed.

[0042] The hollow optical fiber composite cable for backbone communication network bears the task of data transmission, which will make its temperature higher than the surrounding environment. The temperature formed in this way is sufficient to drive the thermoelectric power supply 6 to supply power to the detection ring 5. This temperature difference always exists and can meet the power demand of the detection ring 5 throughout its entire service life.

[0043] In some examples, a reinforcing cable 11 is arranged at the middle position of the sealed space inside the outer sheath 1, and the hollow optical fiber 2 and the solid optical fiber 3 are arranged around the reinforcing cable 11. The reinforcing cable 11 functions to improve the structural strength of the hollow optical fiber composite cable for backbone communication network disclosed in the present application. The material is generally a metal material or a synthetic polymer material.

[0044] In some examples, please refer to Figure 2 , Figure 3 and Figure 4 The detection ring 5 includes a first half ring 51, a second half ring 52, and a detection circuit 53. The first half ring 51 and the second half ring 52 function to facilitate installation and are generally fixed by bolts. The detection circuit 53 is located inside the first half ring 51 or the second half ring 52, and the thermoelectric power supply 6 is also located inside the first half ring 51 or the second half ring 52.

[0045] The detection circuit 53 includes a current generating unit 531, a resistance detection unit 532, and a rechargeable battery 533. The current generating unit 531 is used to send a detection current to the electrically connected metal detection wire mesh 4, and the resistance detection unit 532 is used to detect the resistance of the electrically connected metal detection wire mesh 4.

[0046] The charging battery 533 is electrically connected with the current generating unit 531 and the resistance detecting unit 532, for supplying power to the current generating unit 531 and the resistance detecting unit 532, and is also electrically connected with the thermoelectric power supply 6, which charges the charging battery 533.

[0047] In some examples, the number of the current generating unit 531 and the resistance detecting unit 532 is two, because one detection ring 5 is responsible for the detection of two metal detection screens 4, so the number of the current generating unit 531 and the resistance detecting unit 532 is two.

[0048] In other examples, the number of the current generating unit 531 and the resistance detecting unit 532 is one, but two switching switches 534 are added, which are electrically connected with the current generating unit 531 and the resistance detecting unit 532 respectively, and each switching switch 534 is electrically connected with two adjacent metal detection screens 4.

[0049] The switching switch 534 is used to replace the metal detection screen 4 connected with the current generating unit 531 and the resistance detecting unit 532, and this way can reduce the number of the current generating unit 531 and the resistance detecting unit 532 to one.

[0050] In some examples, the first surface of the thermoelectric power supply 6 is attached to the outer sheath 1, and the second surface is attached to the detection ring 5, and the temperature of the outer sheath 1 and the detection ring 5 is different, which can provide two different temperatures required for the thermoelectric power supply 6 to work.

[0051] In some possible implementations, a heat dissipation fin 54 is added to the detection ring 5, which can increase the heat dissipation area of the detection ring 5, so that the temperature of the detection ring 5 can be further reduced.

[0052] Further, a layer of heat insulation material, such as glass wool or rock wool, is added to the surrounding area of the contact position of the thermoelectric power supply 6 on the detection ring 5, which can block the heat transfer and create a local high-temperature area at the position of the thermoelectric power supply 6 on the outer sheath 1, so as to further expand the temperature difference.

[0053] It should be noted that the thermoelectric power supply 6 is located in a recessed area on the inner wall of the detection ring 5, as shown in Figure 5 The heat insulation material is attached to the inner wall of the detection ring 5 around the recessed area. The two sides of the detection ring 5 are provided with an elongated sleeve, which is sleeved on the outer sheath 1, and the inner wall is coated with an adhesive, which can increase the contact area and achieve good sealing effect.

[0054] The installation of the detection ring 5 needs to be broken on the outer sheath 1, that is, part of the outer sheath 1 in the area above the metal detection wire mesh 4 is removed, the area is controlled to be about 5-15 square millimeters, and then the metal wire is used to connect the metal detection wire mesh 4 and the connecting head on the detection ring 5, and the connecting head on the detection ring 5 is electrically connected with the detection circuit 53.

[0055] The current generating unit 531 includes a solid-state electronic switch and a control chip (for example, 89C51), the control end of the solid-state electronic switch is connected with a control pin of the control chip, one connection end of the solid-state electronic switch is electrically connected with the thermoelectric power supply 6, and the other connection end is electrically connected with the metal detection wire mesh 4 or the switching switch 534.

[0056] The working principle of the resistance detection unit 532 is to obtain the current, and then the resistance value of the metal detection wire mesh 4 is calculated through the ratio of voltage to current. Generally, a current detection chip (TI INA180, ADI AD8410) is used, and the current detection chip generates data to be sent to the control chip in the current generating unit 531 for calculation.

[0057] In addition, a communication module needs to be added, generally an Internet of Things module (Cat1 module) is used to communicate with the cloud, and the Internet of Things module is also electrically connected with an input end of the control chip in the current generating unit 531.

[0058] The control chip in the current generating unit 531 can also be separated out, at this time, only a solid-state electronic switch exists in the current generating unit 531.

[0059] The control chip in the current generating unit 531 reports data including the resistance value (normal / abnormal) and the position number. Generally, the detection length of one metal detection wire mesh 4 is one kilometer to five kilometers, and the detection frequency is controlled to be 3-5 days once (high frequency) or 7-15 days once (low frequency).

[0060] At this time, only the approximate position can be reported, and for specific position detection, one way is to apply a high-frequency signal to one side of the detection ring 5 at the reported abnormal position, and then the specific position is determined through the reflection signal of the high-frequency signal. The principle is that the high-frequency signal will generate a reflection signal at the damaged position, and the reflection signal will be received at different times at different damaged positions.

[0061] The embodiments of the specific embodiment are the preferred embodiments of the application, and are not limited to the protection scope of the application, so that: any equivalent changes made according to the structure, shape and principle of the application should be covered within the protection scope of the application.

Claims

1. A hollow core fiber composite cable for a backbone communication network, characterized by, The utility model relates to a kind of metal detection devices, including: Outer sheath (1); Hollow optical fiber (2) and solid core optical fiber (3) are located in the closed space inside outer sheath (1); Multiple metal detection wire screens (4) are arranged at intervals inside outer sheath (1), and gap exists between adjacent metal detection wire screens (4); Detection ring (5) is coated on outer sheath (1), and detection ring (5) is electrically connected with two adjacent metal detection wire screens (4); Thermoelectric power supply (6) is arranged on detection ring (5) and is electrically connected with detection circuit (53) inside detection ring (5).

2. The hollow-core fiber composite cable for a backbone communication network according to claim 1, characterized by, Reinforcing cable (11) is arranged at the middle position of the closed space inside outer sheath (1), and hollow optical fiber (2) and solid core optical fiber (3) are arranged around reinforcing cable (11).

3. The hollow-core fiber composite cable for a backbone communication network according to claim 1 or 2, characterized in that, Detection ring (5) includes: First half ring (51) and second half ring (52); Detection circuit (53) is arranged inside first half ring (51) or second half ring (52); Wherein, thermoelectric power supply (6) is arranged inside first half ring (51) or second half ring (52).

4. The hollow-core fiber composite cable for a backbone communication network according to claim 3, characterized by, Detection circuit (53) includes: Current generating unit (531) is used to send detection current to electrically connected metal detection wire screen (4); Resistance detection unit (532) is used to detect the resistance of electrically connected metal detection wire screen (4); Charging battery (533) is electrically connected with current generating unit (531) and resistance detection unit (532).

5. The hollow-core fiber composite cable for a backbone communication network according to claim 4, wherein, The number of current generating unit (531) and resistance detection unit (532) is two.

6. The hollow-core fiber composite cable for a backbone communication network according to claim 4, wherein, It also includes two switching switches (534) electrically connected with current generating unit (531) and resistance detection unit (532) respectively; Switching switch (534) is electrically connected with two adjacent metal detection wire screens (4).

7. The hollow-core fiber composite cable for a backbone communication network according to claim 1, wherein, The first surface of thermoelectric power supply (6) is attached to outer sheath (1), and the second surface is attached to detection ring (5).

8. The hollow-core fiber composite cable for a backbone communication network according to claim 7, characterized by, Detection ring (5) is also provided with heat dissipation fin (54).

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