Bending-resistant multimode optical fiber

Abstract

The utility model relates to the technical field of optical fibers, in particular to a bending-resistant multimode optical fiber, which comprises a plurality of groups of optical fiber units, a sleeve is sleeved outside each group of optical fiber units, a bending-resistant framework is arranged outside each sleeve, the framework comprises an inner layer and an outer layer, a plurality of reinforcing ribs are uniformly distributed between the inner layer and the outer layer along the circumferential direction, and the reinforcing ribs are uniformly distributed between the inner layer and the outer layer. The surface of the outer layer is sleeved with an aluminum foil shielding layer, the surface of the aluminum foil shielding layer is sleeved with an armor layer, the surface of the armor layer is sleeved with a protective layer, the surface of the protective layer is evenly provided with a plurality of protruding parts in the circumferential direction, anti-bending reinforcing cores are arranged in the protruding parts, and reinforcing ribs are made of materials which are high in hardness and have elasticity. And the reinforcing core is made of a metal material with high strength and high elasticity. The reinforcing ribs and the reinforcing cores are arranged, so that when the multimode optical fiber is bent by external force, the reinforcing ribs and the reinforcing cores can play a role in bending resistance, and meanwhile, the filling cavities and the filling wires can play a role in buffering, so that the protection of the optical fiber unit is further enhanced.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical fiber technical field, concretely relates to a kind of anti-bending multimode optical fiber. BACKGROUND

[0002] Multimode cable refers to the cable assembly comprising multimode optical fiber. The cable is a certain number of optical fibers that are bundled into a cable core according to a certain method, and are wrapped with a sheath. Some are also wrapped with an outer protective layer to realize optical signal transmission.

[0003] For example, the patent with the announcement number CN218630288U discloses an optical fiber, which comprises a fiber core, and an anti-pressure sleeve is arranged on the outer surface of the fiber core. The anti-pressure sleeve comprises a first base layer, a nylon fiber layer is arranged on the top of the first base layer, a carbon fiber layer is arranged on the bottom of the first base layer, and an anti-pulling sleeve is sleeved on the outer surface of the anti-pressure sleeve. The anti-pulling sleeve comprises a second base layer. Although the carbon fiber layer arranged on the bottom of the first base layer makes the anti-pressure sleeve have very good pressure resistance, and the polyvinyl chloride layer arranged on the top of the second base layer makes the anti-pulling sleeve have very good anti-pulling performance, achieving the purpose of good pressure resistance and anti-pulling performance.

[0004] However, the optical fiber has some deficiencies. During construction and use, the optical fiber may be damaged due to excessive bending angle of the optical cable, affecting the transmission of optical fiber signals. Although the anti-pressure sleeve improves the pressure resistance and anti-pulling performance, the anti-bending effect is not significant, and thus needs to be improved. SUMMARY

[0005] The utility model aims at providing an anti-bending multimode optical fiber to solve the problems in the background art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical scheme:

[0007] An anti-bending multimode optical fiber comprises a plurality of optical fiber units, each optical fiber unit is sleeved with a sleeve, and the sleeve is provided with an anti-bending framework. The framework comprises an inner layer and an outer layer, a plurality of reinforcing ribs are uniformly arranged between the inner layer and the outer layer in the circumferential direction, an aluminum foil shielding layer is sleeved on the surface of the outer layer, an armor layer is sleeved on the surface of the aluminum foil shielding layer, a protective layer is sleeved on the surface of the armor layer, a plurality of protruding parts are uniformly arranged on the surface of the protective layer in the circumferential direction, and a reinforcing core is arranged in each protruding part.

[0008] Further, the reinforcing ribs are made of a material with high hardness and elasticity, and the reinforcing core is made of a metal material with high strength and high elasticity.

[0009] Further, a plurality of filling cavities are formed between the reinforcing ribs, and a filling wire is arranged in each filling cavity.

[0010] Further, a gap is arranged between the optical fiber unit and the sleeve, and the gap is filled with fiber oil paste.

[0011] Further, the armor layer is made of metal material with high mechanical property and tensile property.

[0012] Further, a center reinforcing member is arranged at the center of the inner layer.

[0013] Compared with the prior art, the utility model has the beneficial effects that:

[0014] 1. The utility model discloses a kind of multi-mode optical fibers, including sleeve, the inner layer of optical fiber unit, the outer layer of the inner layer, the reinforcing rib of the outer layer, the aluminum foil shielding layer of the outer layer, the armor layer of the aluminum foil shielding layer, the protective layer of the armor layer, the protruding portion of the protective layer, the reinforcing core of the protruding portion, the filling cavity of the reinforcing core, the filling silk of the filling cavity and fiber oil paste, the sleeve is arranged on the outer layer of the inner layer, the inner layer is arranged on the reinforcing rib, the reinforcing rib is arranged on the aluminum foil shielding layer, the aluminum foil shielding layer is arranged on the armor layer, the armor layer is arranged on the protective layer, the protective layer is arranged on the protruding portion, the protruding portion is arranged on the reinforcing core, the reinforcing core is arranged in the filling cavity, the filling silk is arranged in the filling cavity, and fiber oil paste is arranged between the filling silk and the filling cavity.

[0015] The utility model discloses a kind of multi-mode optical fibers, including sleeve, the inner layer of optical fiber unit, the outer layer of the inner layer, the reinforcing rib of the outer layer, the aluminum foil shielding layer of the outer layer, the armor layer of the aluminum foil shielding layer, the protective layer of the armor layer, the protruding portion of the protective layer, the reinforcing core of the protruding portion, the filling cavity of the reinforcing core, the filling silk of the filling cavity and fiber oil paste, the sleeve is arranged on the outer layer of the inner layer, the inner layer is arranged on the reinforcing rib, the reinforcing rib is arranged on the aluminum foil shielding layer, the aluminum foil shielding layer is arranged on the armor layer, the armor layer is arranged on the protective layer, the protective layer is arranged on the protruding portion, the protruding portion is arranged on the reinforcing core, the reinforcing core is arranged in the filling cavity, the filling silk is arranged in the filling cavity, and fiber oil paste is arranged between the filling silk and the filling cavity. BRIEF DESCRIPTION OF DRAWINGS

[0016] Fig. 1 It is a structure schematic view of the anti-bending multi-mode optical fiber in the utility model.

[0017] Fig. 2 It is a structure schematic view of the anti-bending multi-mode optical fiber not placed in the utility model and is collected frame.

[0018] The meaning of each reference sign in the drawing is as follows: 100, optical fiber unit;101, sleeve;102, inner layer;103, outer layer;104, reinforcing rib;105, aluminum foil shielding layer;106, armor layer;107, protective layer;108, protruding portion;109, reinforcing core;200, filling cavity;201, filling silk;202, fiber oil paste;203, center reinforcing member. DETAILED DESCRIPTION

[0019] For further understanding of the content of the utility model, the utility model is described in detail in conjunction with drawing and example. It should be understood that example is only explained the utility model and is not limited.

[0020] The following combines with the drawing Figs. 1-2 The example is further described in detail.

[0021] Referring to Figs. 1-2 The anti-bending multi-mode optical fiber in the embodiment comprises a plurality of optical fiber units 100, each of which is sheathed with a sleeve 101, and the sleeve 101 is provided with an anti-bending framework; the framework comprises an inner layer 102 and an outer layer 103, a plurality of reinforcing ribs 104 are uniformly arranged between the inner layer 102 and the outer layer 103 in the circumferential direction, an aluminum foil shielding layer 105 is sheathed on the surface of the outer layer 103, an armor layer 106 is sheathed on the surface of the aluminum foil shielding layer 105, a protective layer 107 is sheathed on the surface of the armor layer 106, a plurality of protruding portions 108 are uniformly arranged on the surface of the protective layer 107 in the circumferential direction, and an anti-bending reinforcing core 109 is arranged in each protruding portion 108; the reinforcing ribs 104 are made of a material with high hardness and elasticity, the reinforcing core 109 is made of a metal material with high strength and elasticity, and the armor layer 106 is made of a metal material with high mechanical properties and tensile properties.

[0022] In the embodiment, the sleeve 101 is made of polypropylene or nylon material, so that the sleeve 101 has good wear resistance, flame resistance and water and fire resistance, and can effectively protect the optical fiber unit 100 from internal stress and external lateral pressure;

[0023] Specifically, the framework is made of plastic with toughness and corrosion resistance, and can withstand axial tension and lateral pressure, so as to avoid excessive bending of the optical fiber during construction and use, reduce the loss of the optical fiber, and further strengthen the protection of the optical fiber unit 100;

[0024] The reinforcing ribs 104 are arranged along the extension direction of the framework, and are used to increase the anti-bending strength of the framework; the reinforcing ribs 104 are made of plastic with certain hardness and elasticity, and are used to strengthen the strength of the framework, so that the framework can better protect the optical fiber unit 100;

[0025] In the embodiment, the aluminum foil shielding layer 105 is used to isolate external electromagnetic interference and simultaneously plays a role of safety protection;

[0026] In the embodiment, the armor layer 106 is made of metal material (such as steel belt, steel wire or aluminum belt), and provides all-round protection for the optical fiber unit 100; the armor layer 106 has high mechanical strength, wear and scratch resistance, waterproof and moisture resistance, rat prevention and corrosion resistance, and is suitable for various harsh environments;

[0027] In the embodiment, the protective layer 107 is made of polyvinyl chloride, and can prevent direct damage of mechanical stress such as excavation, extrusion and stretching on the optical fiber unit 100; at the same time, the protective layer 107 can isolate the erosion of corrosive substances such as soil, moisture, acid and alkali to the inside of the protective layer 107, thereby prolonging the service life of the multi-mode optical fiber;

[0028] The protruding part 108 is also made of polyvinyl chloride, which strengthens the protective layer 107 and makes the protective effect of the protective layer 107 better.

[0029] The reinforcing core 109 is made of thermoplastic elastomer material, which can be bent and stretched like rubber and can restore to the original state after the external force is removed, and has good bending resistance. Therefore, it can improve the bending resistance of the protective layer 107, so that the multi-mode optical fiber has good bending resistance when it is bent by external force. In addition, it has aging resistance and can maintain stable performance for a long time.

[0030] Please refer to Figs. 1-2 In this embodiment, a plurality of filling cavities 200 are formed between the reinforcing ribs 104, and the filling cavities 200 are provided with filling wires 201.

[0031] In this embodiment, the filling wire 201 is made of aramid fiber material, which is used to fill the filling cavity 200 (only one is shown in the figure). That is, it can fill the gap between the inner layer 102 and the outer layer 103. The filling wire 201 can improve the tensile strength of the optical cable, so that it is not easy to break when subjected to external force. At the same time, the filling of the filling wire 201 has a corresponding buffering effect, so that the damage to the optical fiber unit 100 is reduced when the multi-mode optical fiber is subjected to external force.

[0032] Please refer to Figs. 1-2 In this embodiment, a gap is formed between the optical fiber unit 100 and the sleeve 101, and the gap is filled with fiber oil paste 202.

[0033] In this embodiment, the fiber oil paste 202 protects the optical fiber unit 100, prevents the optical fiber unit 100 in the sleeve 101 from being damaged by mechanical damage or external environment, and also lubricates and repairs the optical fiber unit 100.

[0034] Please refer to Figs. 1-2 In this embodiment, the center of the inner layer 102 is provided with a center reinforcing member 203.

[0035] In this embodiment, the center reinforcing member 203 is made of metal material, such as steel wire, which provides high tensile strength, i.e. improves the tensile strength of the inner layer 102, so as to ensure that the multi-mode optical fiber is not easy to break when subjected to external force.

[0036] The utility model discloses a reinforcing rib 104 on the protective layer 107 and reinforcing core 109 in the framework can play the role of bending resistance when the multimode fiber is bent by external force, and the filling cavity 200 and filling wire 201 can play the role of buffering, thereby avoiding the bending of the multimode fiber, the breakage of the fiber unit 100, and the transmission problem of the fiber signal.

[0037] In summary, the above only for the preferred embodiment of the utility model, all changes and modifications made according to the utility model patent application scope, should belong to the utility model patent's coverage.

Claims

1. A bend-resistant multimode optical fiber, comprising multiple sets of optical fiber units (100), characterized in that: Each fiber unit (100) is covered with a sleeve (101), and the sleeve (101) is covered with a bending-resistant skeleton. The skeleton includes an inner layer (102) and an outer layer (103). Multiple reinforcing ribs (104) are evenly distributed in the circumferential direction between the inner layer (102) and the outer layer (103). An aluminum foil shielding layer (105) is covered on the surface of the outer layer (103). An armor layer (106) is covered on the surface of the aluminum foil shielding layer (105). A protective layer (107) is covered on the surface of the armor layer (106). Multiple protrusions (108) are evenly distributed in the circumferential direction on the surface of the protective layer (107). A bending-resistant reinforcing core (109) is provided inside the protrusions (108).

2. The bend-resistant multimode optical fiber according to claim 1, characterized in that: The reinforcing rib (104) is made of a material with high hardness and elasticity, and the reinforcing core (109) is made of a metal material with high strength and high elasticity.

3. The bend-resistant multimode optical fiber according to claim 1, characterized in that: Multiple filling cavities (200) are formed between the reinforcing ribs (104), and filling wires (201) are provided in the filling cavities (200).

4. The bend-resistant multimode optical fiber according to claim 1, characterized in that: A gap is provided between the optical fiber unit (100) and the sleeve (101), and the gap is filled with fiber grease (202).

5. The bend-resistant multimode optical fiber according to claim 1, characterized in that: The armor layer (106) is made of a metal material with high mechanical and tensile properties.

6. The bend-resistant multimode optical fiber according to claim 1, characterized in that: A central reinforcement (203) is provided at the center of the inner layer (102).

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