Hollow-core optical fiber composite cable for communication

Abstract

The utility model relates to a hollow-core optical fiber composite cable for communication. Comprising a protective sleeve, a reinforcing rod located in the inner space of the protective sleeve, at least one hollow optical fiber and at least one solid optical fiber which are located in the inner space of the protective sleeve and arranged around the reinforcing rod, and a plurality of partition walls arranged in the protective sleeve at intervals. The one-way air pressure valves are arranged on the protective sleeve and communicated with the corresponding independent spaces, the optical fiber type pressure sensors are arranged in the protective sleeve, the axes of the reinforcing rods coincide with the axis of the protective sleeve, and the spaces in the protective sleeve are divided into a plurality of independent spaces by the partition walls; and the optical fiber type pressure sensor is communicated with the corresponding independent space through a through hole formed in the inner wall of the protective sleeve. According to the hollow-core optical fiber composite cable for communication disclosed by the invention, the damaged position of the hollow-core optical fiber composite cable is actively managed in an active air pressure monitoring and pressure supplementing mode, and in this way, the damaged position can be found in time, and meanwhile, a positive pressure mode is used to avoid water vapor infiltration.

Description

TECHNICAL FIELD

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

[0002] One of the core differences between hollow core fiber and solid core fiber is the propagation medium, in the solid core fiber, light propagates in "glass", in the hollow core fiber, light propagates in "air". In terms of data transmission, hollow core fiber can transmit extremely high power optical pulses without distortion, and has advantages in low delay, high power capacity and weak nonlinearity.

[0003] One of the current transmission methods is to use hollow core fiber and solid core fiber at the same time, responsible for undertaking massive general data throughput, power transmission (through copper wire), and providing monitoring and management channels for the entire system, and hollow core fiber is responsible for transmitting "privileged" data that is extremely sensitive to delay, power or nonlinearity.

[0004] One of the current problems is that when the outer sheath is damaged, water vapor in the air is easy to penetrate into the fine air channel, which will seriously affect the transmission of optical signals, and may even cause communication interruption. The solution is to increase the coating and structural protection, etc. These measures are passive measures, although the measures prolong the use time, there is still a potential risk of interfering with the transmission after failure. For the main communication line and backbone communication line, these passive measures are still insufficient. CONTENT OF THE UTILITY MODEL

[0005] The present application provides a hollow core fiber composite cable for communication, which actively manages the damaged position of the hollow core fiber composite cable through active air pressure monitoring and pressure compensation. This method can timely find the damaged position and avoid water vapor penetration using positive pressure.

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

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

[0008] A protective sleeve;

[0009] A reinforcing rod located in the internal space of the protective sleeve, the axis of the reinforcing rod coincides with the axis of the protective sleeve;

[0010] At least one hollow core fiber and at least one solid core fiber are located in the internal space of the protective sleeve and arranged around the reinforcing rod;

[0011] A plurality of partition walls are arranged in the protective sleeve, and the partition walls divide the space in the protective sleeve into a plurality of independent spaces;

[0012] A one-way air pressure valve is arranged on the protective sleeve and communicates with the corresponding independent space.

[0013] An optical fiber pressure sensor is arranged in the protective sleeve, and the optical fiber pressure sensor communicates with the corresponding independent space through a through hole arranged on the inner wall of the protective sleeve.

[0014] In a possible implementation of the present application, the partition wall comprises an inner ring and an outer ring, and a fixed semicircular groove is arranged on each of the inner ring and the outer ring.

[0015] The fixed semicircular groove on the inner ring and the corresponding fixed semicircular groove on the outer ring form a fixed channel.

[0016] In a possible implementation of the present application, the diameter of the fixed channel is slightly smaller than the diameter of the corresponding hollow core optical fiber or solid core optical fiber.

[0017] In a possible implementation of the present application, the protective sleeve comprises a winding layer and a sealing layer, and the winding layer is located inside the sealing layer.

[0018] In a possible implementation of the present application, the optical fiber pressure sensor is located between the winding layer and the sealing layer.

[0019] In a possible implementation of the present application, a waterproof coating is coated on the outer wall of the winding layer.

[0020] In a possible implementation of the present application, the optical fiber pressure sensor is located between the winding layer and the waterproof coating.

[0021] In a possible implementation of the present application, the one-way air pressure valve comprises:

[0022] A first valve body is located inside the protective sleeve and communicates with the corresponding independent space;

[0023] A second valve body, and a connecting end of the second valve body penetrates into the protective sleeve and is in sealing connection with the first valve body.

[0024] The present application has the following beneficial effects:

[0025] The hollow core optical fiber composite cable for communication disclosed in the present application uses a continuous independent space structure, each independent space can perform pressure detection and active gas supplement, when one of the independent spaces is damaged by intrusion, the damage can be sensed through internal air pressure change, the position is determined, and the independent space is supplemented with gas, without affecting the current communication process. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a cross-sectional schematic view of a hollow core optical fiber composite cable for communication provided by the present application.

[0027] Figure 2is a position diagram of a one-way air pressure valve and a fiber-optic pressure sensor provided by the present application.

[0028] Figure 3 is a structural diagram of an inner ring provided by the present application.

[0029] Figure 4 is a structural diagram of an outer ring provided by the present application.

[0030] Figure 5 is a detection principle diagram of a fiber-optic pressure sensor provided by the present application.

[0031] Figure 6 is a position diagram of another one-way air pressure valve and a fiber-optic pressure sensor provided by the present application.

[0032] Figure 7 is a structural diagram of a one-way air pressure valve provided by the present application.

[0033] In the figure, 1 is a protective sleeve, 2 is a reinforcing rod, 3 is a hollow optical fiber, 4 is a solid optical fiber, 5 is a partition wall, 6 is a one-way air pressure valve, 7 is a fiber-optic pressure sensor, 11 is a winding layer, 12 is a sealing layer, 13 is a waterproof coating, 51 is an inner ring, 52 is an outer ring, 61 is a first valve body, and 62 is a second valve body. DETAILED DESCRIPTION

[0034] The technical solutions in the present application are further described in detail below with reference to the accompanying drawings.

[0035] The present application discloses a hollow optical fiber composite cable for communication. In some examples, the hollow optical fiber composite cable for communication disclosed by the present application comprises a protective sleeve 1, a reinforcing rod 2, a hollow optical fiber 3, a solid optical fiber 4, a plurality of partition walls 5, a one-way air pressure valve 6, and a fiber-optic pressure sensor 7. Specifically, please refer to Figure 1 The reinforcing rod 2 is located in the inner space of the protective sleeve 1, generally at the middle position of the inner space of the protective sleeve 1, at which time the axis of the reinforcing rod 2 coincides with the axis of the protective sleeve 1.

[0036] The reinforcing rod 2 is generally made of metal material, which aims to ensure the structural strength.

[0037] The hollow optical fiber 3 and the solid optical fiber 4 (using 652D optical fiber) are located in the inner space of the protective sleeve 1 and arranged around the reinforcing rod 2. In some possible implementation manners, the number of the hollow optical fiber 3 is two, and the number of the solid optical fiber 4 is four.

[0038] The hollow optical fiber 3 and the solid optical fiber 4 realize non-physical contact with the reinforcing rod 2 through the partition wall 5. The plurality of partition walls 5 are arranged at intervals in the protective sleeve 1, and the partition wall 5 divides the space in the protective sleeve 1 into a plurality of independent spaces.

[0039] The hollow optical fiber 3 and the solid optical fiber 4 pass through the corresponding fixed channels on the partition wall 5, and are bonded and sealed at the joint surface by using glue.

[0040] The length of the hollow optical fiber 3 and the solid optical fiber 4 between the two partition walls 5 is slightly greater than the distance between the two partition walls 5, and the length allowance is generally controlled at about 2% of the distance between the two partition walls 5, which mainly considers that the hollow optical fiber 3 and / or the solid optical fiber 4 on one side will be stretched when being bent.

[0041] Please refer to Figure 2 The one-way air pressure valve 6 is arranged on the protective sleeve 1 and communicates with the corresponding independent space, and the purpose is to supplement the inert gas to the independent space. The optical fiber type pressure sensor 7 is arranged in the protective sleeve 1, and the optical fiber type pressure sensor 7 communicates with the corresponding independent space through the through hole formed on the inner wall of the protective sleeve 1.

[0042] The optical fiber type pressure sensor 7 is introduced by using distributed optical fiber pressure sensing:

[0043] It is not an independent "point" sensor, but the whole optical fiber is changed into a continuous sensing strip. First, a laser pulse is emitted into the optical fiber, and the pulse will be scattered (Rayleigh scattering, Raman scattering, Brillouin scattering) when propagating in the optical fiber. When the pressure acts on the optical fiber, the strain of the optical fiber will be changed, and then the characteristics of the scattered light (such as the frequency drift of Brillouin scattering which is linearly related to the strain and temperature) will be changed.

[0044] By measuring the time and characteristics of the scattered light returned, the pressure distribution of the optical fiber along the line can be located and quantitatively analyzed.

[0045] In some examples, as shown in Figure 3 and Figure 4 The partition wall 5 includes an inner ring 51 and an outer ring 52, and the fixed semicircular grooves 53 are arranged on the inner ring 51 and the outer ring 52. The fixed semicircular grooves 53 on the inner ring 51 and the corresponding fixed semicircular grooves 53 on the outer ring 52 form the fixed channel.

[0046] When manufacturing, first, the inner ring 51 (which can be divided into two halves) is bonded on the reinforcing rod 2, then the hollow optical fiber 3 and the solid optical fiber 4 are laid, and then the outer ring 52 (which can be divided into two halves) is bonded at the corresponding position.

[0047] In some possible implementation manners, the outer wall of the outer ring 52 is also coated with glue, which is used to bond with the inner wall of the protective sleeve 1.

[0048] In some possible implementation manners, the diameter of the fixed channel is slightly smaller than the diameter of the corresponding hollow optical fiber 3 or solid optical fiber 4, and the purpose is to improve the sealing performance of the joint by appropriate pressure.

[0049] In some examples, as shown in Figure 1 The protective sleeve 1 includes a winding layer 11 and a sealing layer 12, the winding layer 11 is inside the sealing layer 12, and the winding layer 11 is made by winding first, and then the sealing layer 12 is made.

[0050] The sealing layer 12 is made by sending the winding layer 11 into the heated material and then extruding (using a spiral extruder), and then the material wrapped in the sealing layer 12 is shaped, cooled, etc. Finally, the sealing layer 12 is obtained.

[0051] The sealing layer 12 is generally made of rubber combined with various additives (antioxidants, anti-aging agents, modification agents, etc.), of course, this is just an example, not as a limitation of the present application.

[0052] In some possible implementations, the optical fiber pressure sensor 7 is located between the winding layer 11 and the sealing layer 12, that is, the optical fiber pressure sensor 7 is sealed between the winding layer 11 and the sealing layer 12 at the same time as the sealing layer 12 is made.

[0053] Specifically, after the winding layer 11 is made, as shown in Figure 5 The optical fiber pressure sensor 7 is bonded to the winding layer 11, and a hole is opened at the corresponding position, and a corresponding sealing box body is added to the optical fiber pressure sensor 7 at the position, and the box body is bonded and fixed at the connection position of the independent space at the hole position using glue.

[0054] In some examples, the outer wall of the winding layer 11 is coated with a waterproof coating 13, which provides protection when the sealing layer 12 fails, preventing water vapor from continuing to penetrate into the winding layer 11.

[0055] In some possible implementations, the optical fiber pressure sensor 7 is located between the winding layer 11 and the waterproof coating 13, and the waterproof coating 13 is made after the optical fiber pressure sensor 7 is bonded to the winding layer 11, and then the winding layer 11 is made.

[0056] The waterproof coating 13 is made by spraying, liquid immersion, or the method of making the sealing layer 12.

[0057] In some examples, referring to Figure 7 The one-way air pressure valve 6 includes a first valve body 61 and a second valve body 62, the first valve body 61 is located inside the protective sleeve 1 and communicates with the corresponding independent space, combined with the structure of the protective sleeve 1, the first valve body 61 can be directly bonded to the winding layer 11, and then communicated with the corresponding independent space using the piercing method, and then the waterproof coating 13 and the sealing layer 12 are made.

[0058] It should be noted that the first valve body 61 is located inside the sealing layer 12 at this time. A plastic film is added to the connection end of the first valve body 61 for sealing.

[0059] After the connecting end of the second valve body 62 is inserted into the protective sleeve 1, it is sealed and connected to the first valve body 61. The sealing connection is generally made by threaded connection, and sealant needs to be applied to the insertion position for fixation.

[0060] The embodiments described in this specific implementation are preferred embodiments of this application and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A hollow core fiber composite cable for communication, characterized by, The utility model relates to a kind of optical fiber pressure sensor, including: Protective cover (1); Reinforcing rod (2), located in the internal space of protective cover (1), the axis of reinforcing rod (2) coincides with the axis of protective cover (1); At least one hollow optical fiber (3) and at least one solid optical fiber (4) are located in the internal space of protective cover (1) and are arranged around reinforcing rod (2); Multiple partition walls (5) are spaced apart in protective cover (1), and partition wall (5) divides the space in protective cover (1) into multiple independent spaces; One-way air pressure valve (6) is provided on protective cover (1) and communicates with the corresponding independent space; Optical fiber pressure sensor (7) is provided in protective cover (1), and optical fiber pressure sensor (7) communicates with the corresponding independent space through the through hole provided on the inner wall of protective cover (1).

2. The hollow-core fiber composite cable for communication according to claim 1, characterized by, Partition wall (5) includes inner ring (51) and outer ring (52), and fixed semicircular groove (53) is arranged on inner ring (51) and outer ring (52). The fixed semicircular groove (53) on inner ring (51) and the corresponding fixed semicircular groove (53) on outer ring (52) form a fixed channel.

3. The hollow-core fiber composite cable for communication according to claim 2, characterized by, The diameter of the fixed channel is slightly smaller than the diameter of the corresponding hollow optical fiber (3) or solid optical fiber (4).

4. The hollow-core fiber composite cable for communication according to claim 1, wherein Protective cover (1) includes winding layer (11) and sealing layer (12), and winding layer (11) is located inside sealing layer (12).

5. The hollow-core fiber composite cable for communication according to claim 4, wherein Optical fiber pressure sensor (7) is located between winding layer (11) and sealing layer (12).

6. The hollow fiber composite cable for communication according to claim 4, wherein Waterproof coating (13) is coated on the outer wall of winding layer (11).

7. The hollow-core fiber composite cable for communication according to claim 6, wherein Optical fiber pressure sensor (7) is located between winding layer (11) and waterproof coating (13).

8. The hollow fiber composite cable for communication according to claim 1, wherein One-way air pressure valve (6) includes: First valve body (61) is located in the internal space of protective cover (1) and communicates with the corresponding independent space; Second valve body (62), the connecting end of second valve body (62) is pierced into protective cover (1) and is sealingly connected with first valve body (61).

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