Miniaturized multi-core optical cable

Abstract

The utility model belongs to the technical field of special optical cables, and particularly relates to a miniaturized multi-core optical cable, which comprises an optical fiber body, a buffer layer, an inner sheath layer, a tensile reinforcing layer and an outer sheath layer which are sequentially arranged from inside to outside. Compared with the prior art, the optical cable has the beneficial effects that the high and low temperature resistance is excellent, a plurality of optical fiber bodies can be arranged in the optical cable, the transmission of small-size, multi-core and high-density optical signals can be met, and the use requirement of high-density signal transmission in a high-temperature environment is met.

Description

Technical Field

[0001] The utility model belongs to the technical field of special optical cables, and in particular relates to a miniaturized multi-core optical cable suitable for high-density optical signal transmission in a high-temperature environment. Background Art

[0002] Due to the advantages of optical fiber communication such as large capacity, small size, light weight, low loss, strong anti-electromagnetic interference, and good confidentiality, in the information age, the use of optical signals instead of electrical signals for signal transmission in special fields such as high-temperature airborne has become an inevitable development direction. In the field of high-temperature airborne, due to the special use environment and small wiring space, optical cables need to be high-density and miniaturized; and compared with conventional communication optical cables, they need to have wider temperature characteristics. The optical cables currently used are generally single-core optical cables with a diameter of 1.8mm. To increase the communication density, multi-core bundles are used. The minimum outer diameter of the 7-core optical cable bundle is 5.4mm. It is difficult for existing optical cables to meet the special application requirements of high density and miniaturization. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a miniaturized multi-core optical cable for the special environment of high-temperature airborne narrow space, which not only has good mechanical and temperature resistance properties, but also greatly improves the communication transmission density compared with the existing airborne single-core optical cable.

[0004] The purpose of the utility model is to achieve the following technical solutions: A miniaturized multi-core optical cable proposed by the utility model includes an optical fiber body, a buffer layer, an inner sheath layer, a tensile reinforcement layer, and an outer sheath layer arranged in sequence from the inside to the outside.

[0005] Compared with the prior art, the utility model is beneficial in that:

[0006] With excellent high and low temperature resistance, multiple optical fiber bodies can be set in the optical cable, which can meet the transmission of small size, multi-core, and high-density optical signals and meet the requirements of high-density signal transmission in high temperature environments.

[0007] Furthermore, the optical fiber body is a bare optical fiber with an acrylic resin coating. The temperature resistance range is -65°C to +150°C.

[0008] Furthermore, the inner side of the buffer layer accommodates 2-7 optical fiber bodies, and the mode of the optical fiber body is any one of single-mode 9 / 125μm, multi-mode 50 / 125μm, and multi-mode 62.5 / 125μm. With a volume close to that of existing single-core optical cables, the optical cable can accommodate 2-7 high-temperature resistant optical fibers 1, thereby increasing the signal transmission density while keeping the overall volume of the optical cable unchanged.

[0009] Furthermore, the buffer layer is a polytetrafluoroethylene buffer layer with an outer diameter of 0.8-0.9 mm, and the thickness of the polytetrafluoroethylene film used to prepare the polytetrafluoroethylene buffer layer is 0.01-0.1 mm. The temperature resistance range is -65°C to +260°C.

[0010] Furthermore, the inner sheath layer is an ethylene-tetrafluoroethylene copolymer inner sheath layer or an inner sheath layer made of polyetheretherketone, and has a temperature resistance range of -65°C to +150°C.

[0011] Furthermore, the inner sheath layer has a thickness of 0.1 mm and an outer diameter of 1.0-1.1 mm.

[0012] Furthermore, the tensile reinforcement layer is an aromatic polyamide fiber tensile reinforcement layer, with a temperature resistance range of -65°C to +150°C, a tensile force of 150N, and good tensile performance.

[0013] Furthermore, the outer diameter of the tensile reinforcement layer is 1.25 mm-1.35 mm.

[0014] Furthermore, the outer sheath layer is an ethylene-tetrafluoroethylene copolymer outer sheath layer with a temperature resistance range of -65°C to +150°C.

[0015] Furthermore, the outer sheath layer has a thickness of 0.2 mm-0.3 mm and an outer diameter of 1.8 mm-2.0 mm.

[0016] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the utility model more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 The present invention is a schematic structural diagram of a miniaturized multi-core optical cable according to an embodiment of the present invention.

[0018] [Reference Signs]

[0019] 1-high temperature resistant optical fiber, 2-buffer layer, 3-inner sheath layer, 4-tensile reinforcement layer, 5-outer sheath layer. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] An embodiment of a miniaturized multi-core optical cable, such as Figure 1 As shown, the optical cable includes an optical fiber body, a buffer layer 2 made of polytetrafluoroethylene (PTFE) film, an inner sheath layer 3 made of ethylene-tetrafluoroethylene copolymer (ETFE) or polyetheretherketone (PEEK), a tensile reinforcement layer 4 made of aromatic polyamide fiber, and an outer sheath layer 5 made of ethylene-tetrafluoroethylene copolymer (ETFE) which are arranged in sequence from the inside to the outside in the radial direction. The optical fiber body is a high temperature resistant optical fiber 1.

[0022] In this embodiment, the miniaturized multi-core optical cable is a 7-core optical cable, and each high-temperature resistant optical fiber 1 in the 7-core optical cable is the same. A coating device is used to coat a UV-cured acrylic resin coating on the outer surface of the bare optical fiber to form a high-temperature resistant optical fiber 1, thereby improving the temperature resistance range of the optical fiber, and its temperature resistance range is -65°C-+150°C.

[0023] Optical fibers are classified into single-mode and multi-mode according to different modes. In this embodiment, the optical fiber mode used by the high temperature resistant optical fiber may be single-mode 9 / 125 μm, multi-mode 50 / 125 μm or multi-mode 62.5 / 125 μm.

[0024] The 7-core high temperature resistant optical fiber 1 is coated with a polytetrafluoroethylene film to form a buffer layer 2, which plays a role of coating, strengthening protection and buffering, and its temperature resistance range is -65°C-+260°C. The outer diameter of the buffer layer 2 is 0.8-0.9mm. In this embodiment, the outer diameter of the buffer layer is 850μm. In this embodiment, the polytetrafluoroethylene film is wrapped or longitudinally wrapped around the 7-core high temperature resistant optical fiber 1 to form a polytetrafluoroethylene buffer layer using a coating device.

[0025] The polytetrafluoroethylene film is a strip-shaped film, and the thickness of the strip-shaped polytetrafluoroethylene film is 0.01-0.1 mm.

[0026] After the high temperature resistant optical fiber 1 is prepared, 7 high temperature resistant optical fibers 1 are bundled, and a polytetrafluoroethylene film is coated on the outer periphery of the bundled high temperature resistant optical fiber 1 to form a buffer layer 2. The cavity in the buffer layer 2 is used to accommodate the high temperature resistant optical fiber 1.

[0027] The outer periphery of the buffer layer 2 is provided with an inner sheath layer 3 formed by extrusion of ethylene-tetrafluoroethylene copolymer or polyetheretherketone, which plays a role of strengthening protection, and the temperature range is -65°C-+150°C. The thickness of the inner sheath layer 3 is 0.1mm, and the outer diameter is 1.0-1.1mm. In this embodiment, a high-temperature extruder is used to extrude ethylene-tetrafluoroethylene copolymer or polyetheretherketone, and it is wrapped around the outer periphery of the buffer layer 2 to form an ethylene-tetrafluoroethylene copolymer inner sheath layer or a polyetheretherketone inner sheath layer.

[0028] The inner sheath layer 3 is provided with a tensile reinforcement layer 4 formed by weaving aromatic polyamide fibers with high modulus and good tensile properties to improve the tensile properties of the optical cable. The temperature range of the inner sheath layer 3 is -65°C-+150°C. The outer diameter of the tensile reinforcement layer 4 is 1.25mm-1.35mm. In this embodiment, the aromatic polyamide fibers are woven by a braiding machine and covered on the outer periphery of the inner sheath layer 3 to form an aromatic polyamide fiber tensile reinforcement layer, which meets the tensile resistance of 150N.

[0029] The number of strands of the aromatic polyamide fiber is 6-10, and the linear density is 100 dtex-8000 dtex.

[0030] An outer sheath layer 5 formed by extrusion of ethylene-tetrafluoroethylene copolymer is arranged on the periphery of the tensile reinforcement layer 4, with a temperature resistance range of -65°C to +150°C, and improves the mechanical and environmental performance of the optical cable. The thickness of the outer sheath layer 5 is 0.2mm-0.3mm, and the outer diameter is 1.8mm-2.0mm. In this embodiment, a high-temperature extruder is used to extrude ethylene-tetrafluoroethylene copolymer, which is wrapped around the periphery of the tensile reinforcement layer 4 to form an ethylene-tetrafluoroethylene copolymer outer sheath layer.

[0031] The working temperature of the finally manufactured optical cable is between -65°C and +150°C, and it has 7 high temperature resistant optical fibers 1 inside, which can meet the requirements of high-density optical signal transmission in high temperature environment.

[0032] In the temperature range of -65℃-150℃, the additional attenuation of the single-mode optical cable in the 1310nm and 1550nm windows is less than or equal to 0.3dB / km, and the additional attenuation of the multi-mode optical cable in the 850nm and 1300nm windows is less than or equal to 0.5dB / km.

[0033] In other embodiments, the number of high temperature resistant optical fibers is not limited to 7, but can be 2-7. Within this range, the outer diameter of the optical cable is between 1.8-2.0 mm, which is close to the size of the existing single-core optical cable, and the signal transmission density is greatly increased. The single-core optical cable can also adopt the optical cable structure of the utility model, and only one high temperature resistant optical fiber 1 can be set. If the volume of the optical cable is not considered, the structure of the utility model can be adopted, and the number of high temperature resistant optical fibers therein can be set to more than 7.

[0034] The beneficial effects of the utility model are:

[0035] 1) Excellent high and low temperature resistance: The raw materials used in the optical cable can meet good high and low temperature performance, including high temperature resistant optical fiber 1 (temperature range -65℃-+150℃), buffer layer 2 made of polytetrafluoroethylene film (temperature range -65℃-+260℃), inner sheath layer 3 made of ethylene-tetrafluoroethylene copolymer or polyetheretherketone (temperature range -65℃-+150℃), tensile reinforcement layer 4 woven with aromatic polyamide fiber (temperature range -65℃-+150℃) and outer sheath layer 5 made of ethylene-tetrafluoroethylene copolymer (temperature range -65℃-+150℃); the long-term working temperature of the optical cable is between -65℃-+150℃, and multiple high temperature resistant optical fibers 1 can be arranged in the optical cable, which can also meet the transmission of small size, multi-core and high-density optical signals;

[0036] 2) The materials used in the optical cables are all special materials that are resistant to high temperatures and aging. They have good high and low temperature performance, as well as good flame retardancy, mildew resistance, corrosion resistance, and liquid immersion resistance, meeting the requirements for high-density signal transmission in high temperature environments;

[0037] 3) With a volume close to that of existing single-core optical cables, the optical cable can accommodate 2-7 high-temperature resistant optical fibers 1, thereby increasing the signal transmission density while keeping the overall volume of the optical cable unchanged.

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A miniaturized multi-core optical cable, characterized in that: The invention comprises an optical fiber body, a buffer layer (2), an inner sheath layer (3), a tensile reinforcement layer (4), and an outer sheath layer (5) which are arranged in sequence from the inside to the outside; the inner sheath layer (3) is an ethylene-tetrafluoroethylene copolymer inner sheath layer or a polyetheretherketone inner sheath layer.

2. A miniaturized multi-core optical cable according to claim 1, characterized in that: The optical fiber body is a bare optical fiber with an acrylic resin coating.

3. A miniaturized multi-core optical cable according to claim 1 or 2, characterized in that: The buffer layer (2) contains 2 to 7 optical fiber bodies, and the mode of the optical fiber bodies is any one of single-mode 9 / 125 μm, multi-mode 50 / 125 μm, and multi-mode 62.5 / 125 μm.

4. The miniaturized multi-core optical cable according to claim 1, characterized in that: The buffer layer (2) is a polytetrafluoroethylene buffer layer with an outer diameter of 0.8-0.9 mm, and the thickness of the polytetrafluoroethylene film used to prepare the polytetrafluoroethylene buffer layer is 0.01-0.1 mm.

5. The miniaturized multi-core optical cable according to claim 1, characterized in that: The inner sheath layer (3) has a thickness of 0.1 mm and an outer diameter of 1.0-1.1 mm.

6. The miniaturized multi-core optical cable according to claim 1, characterized in that: The tensile reinforcement layer (4) is an aromatic polyamide fiber tensile reinforcement layer.

7. A miniaturized multi-core optical cable according to claim 1 or 6, characterized in that: The outer diameter of the tensile reinforcement layer (4) is 1.25 mm-1.35 mm.

8. The miniaturized multi-core optical cable according to claim 1, characterized in that: The outer sheath layer (5) is an ethylene-tetrafluoroethylene copolymer outer sheath layer.

9. A miniaturized multi-core optical cable according to claim 1 or 8, characterized in that: The outer sheath layer (5) has a thickness of 0.2 mm to 0.3 mm and an outer diameter of 1.8 mm to 2.0 mm.

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