Anti-crosstalk multimode optical fiber

Abstract

The utility model relates to an anti-crosstalk multimode optical fiber, which belongs to the technical field of multimode optical fibers and comprises an optical fiber inner core body and an outer sheath structure arranged outside the optical fiber inner core body, and a tensile structure is arranged between the optical fiber inner core body and the outer sheath structure. And the tensile structure comprises a buffer layer arranged between the optical fiber inner core body and the outer sheath structure. According to the anti-crosstalk multimode optical fiber, through the arrangement of the buffer layer, the influence of external stress on the optical fiber can be reduced, stress generated by bending, extrusion and the like can be buffered, the optical fiber is prevented from being damaged by mechanical stress, through the arrangement of the coating layer, mechanical protection can be provided for the optical fiber, the flexibility and the stretching resistance of the optical fiber are improved, and through the arrangement of the aramid fiber layer, the anti-crosstalk performance is improved. The tensile strength of the optical fiber can be remarkably improved, the optical fiber cannot be broken when subjected to large tensile force, meanwhile, the first shielding layer and the second shielding layer are arranged, the double-shielding effect can be achieved, and the anti-crosstalk capacity of the optical fiber is improved.

Description

Technical Field

[0001] This utility model relates to the field of multimode optical fiber technology, specifically to a multimode optical fiber with anti-crosstalk capability. Background Technology

[0002] Multimode fiber is an optical fiber capable of transmitting multiple modes at a given operating wavelength. When an optical signal is transmitted in multimode fiber, due to the larger core diameter, light rays incident at different angles will propagate in different modes within the fiber. These modes have different propagation constants and group rates. Multimode fiber allows light rays incident at different angles to propagate in multiple modes within the fiber, meaning it can transmit multiple modes of optical signals simultaneously.

[0003] Chinese utility model patent CN220252248U discloses a crosstalk-resistant multimode optical fiber, relating to the field of multimode optical fiber technology. It includes an inner core, a reinforcing frame sleeved on the outer side of the inner core, and a first shielding layer sleeved on the outer side of the reinforcing frame. Filling layers are provided between the reinforcing frame and the inner core, and between the reinforcing frame and the first shielding layer. This utility model utilizes a first shielding layer and a second shielding layer. The second shielding layer is made of conductive rubber, which facilitates the shielding of crosstalk signals through the shielding ability of the conductive rubber, thereby achieving better crosstalk resistance and improving information transmission quality. The first shielding layer is made of tin-plated copper mesh with a braiding density of over 80%, which enhances the anti-interference performance of the multimode optical fiber during transmission, further improving its crosstalk resistance. This strengthens the crosstalk resistance of the multimode optical fiber, enhancing its anti-interference performance during transmission, preventing external interference to the signal, and improving signal transmission efficiency.

[0004] However, in the process of using this utility model, since multimode optical fibers not only need to be protected from damage by external factors in actual use, but also need to improve the mechanical properties of the multimode optical fibers themselves, the device does not have a structure that can improve the mechanical properties of multimode optical fibers, resulting in poor tensile strength and failing to meet production requirements. Therefore, an anti-crosstalk multimode optical fiber is proposed to solve the problems mentioned above. Utility Model Content

[0005] To address the shortcomings of existing technologies, this invention provides a crosstalk-resistant multimode optical fiber with good tensile strength. It solves the problem that in practical applications, multimode optical fibers not only need to be protected from damage by external factors but also require improved mechanical properties. However, this device lacks a structure to enhance the mechanical properties of the multimode optical fiber, resulting in poor tensile strength that fails to meet production requirements.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a crosstalk-resistant multimode optical fiber, comprising an optical fiber core body and an outer sheath structure disposed outside the optical fiber core body, wherein a tensile-resistant structure is disposed between the optical fiber core body and the outer sheath structure.

[0007] The tensile-resistant structure includes a buffer layer disposed between the optical fiber core and the outer sheath structure. A coating layer is disposed on the side of the buffer layer away from the optical fiber core, and an aramid fiber layer is disposed on the side of the coating layer away from the buffer layer.

[0008] Furthermore, the thickness of the buffer layer is greater than the thickness of the coating layer and the aramid fiber layer, respectively, and the aramid fiber layer is wound around the outer surface of the coating layer.

[0009] Furthermore, a second shielding layer is provided on the side of the aramid fiber layer away from the coating layer.

[0010] Furthermore, a first shielding layer is provided between the optical fiber core body and the tensile structure, and the first shielding layer is attached to the outer surface of the optical fiber core body.

[0011] Furthermore, the outer sheath structure consists of an outer protective sleeve, a corrosion-resistant layer, and a water-blocking layer, and the outer sheath structure abuts against the outer surface of the second shielding layer.

[0012] Furthermore, the corrosion-resistant layer is disposed on the outside of the outer protective sleeve, and the water-blocking layer is disposed on the side of the corrosion-resistant layer away from the outer protective sleeve.

[0013] Compared with the prior art, this utility model provides a multimode optical fiber with anti-crosstalk, which has the following characteristics:

[0014] Beneficial effects:

[0015] 1. This anti-crosstalk multimode optical fiber, by setting a buffer layer, can reduce the impact of external stress on the optical fiber, buffer the stress generated by bending, squeezing, etc., and prevent the optical fiber from being damaged by mechanical stress. By setting a coating layer, it can provide mechanical protection for the optical fiber, improve the flexibility and tensile strength of the optical fiber. By setting an aramid fiber layer, it can significantly improve the tensile strength of the optical fiber, so that the optical fiber will not break when subjected to large tensile forces. At the same time, by setting a first shielding layer and a second shielding layer, it can achieve a double shielding effect, which improves the anti-crosstalk capability of the optical fiber.

[0016] 2. This anti-crosstalk multimode optical fiber, by setting an outer protective sleeve, can simultaneously protect the fiber core and tensile structure. Furthermore, by adding a corrosion-resistant layer, the corrosion resistance of the outer protective sleeve is improved. Simultaneously, by adding a water-blocking layer, the waterproof performance is enhanced, making it suitable for a wider range of applications. This solves the problem that in practical applications, multimode optical fibers not only need to be protected from external damage but also require improved mechanical properties. The current device lacks a structure to enhance the mechanical properties of multimode optical fibers, resulting in poor tensile strength and inability to meet production requirements. Attached Figure Description

[0017] Figure 1 This is a three-dimensional view of the structure of this utility model;

[0018] Figure 2 This is a cross-sectional view of the structure of this utility model.

[0019] In the figure: 1. Optical fiber core body, 101. First shielding layer, 2. Outer sheath structure, 201. Outer protective sleeve, 202. Corrosion resistant layer, 203. Water-blocking layer, 3. Tensile structure, 301. Buffer layer, 302. Coating layer, 303. Aramid fiber layer, 304. Second shielding layer. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] Please see Figures 1 to 2 In this embodiment, a crosstalk-resistant multimode optical fiber includes an optical fiber core body 1 and an outer sheath structure 2 disposed outside the optical fiber core body 1. A tensile-resistant structure 3 is disposed between the optical fiber core body 1 and the outer sheath structure 2. The tensile-resistant structure 3 includes a buffer layer 301 disposed between the optical fiber core body 1 and the outer sheath structure 2. A coating layer 302 is disposed on the side of the buffer layer 301 away from the optical fiber core body 1, and an aramid fiber layer 303 is disposed on the side of the coating layer 302 away from the buffer layer 301.

[0022] The thickness of the buffer layer 301 is greater than that of the coating layer 302 and the aramid fiber layer 303, respectively. The aramid fiber layer 303 is wound around the outer surface of the coating layer 302. A second shielding layer 304 is provided on the side of the aramid fiber layer 303 away from the coating layer 302. The diameter of the fiber core body 1 is 50μm, which conforms to the diameter specification of multimode fiber.

[0023] It should be noted that the buffer layer 301 is made of silicone rubber. Its main function is to reduce the impact of external stress on the optical fiber, buffer the stress caused by bending, squeezing, etc., and prevent the optical fiber from being damaged by mechanical stress. At the same time, it can also isolate the optical fiber from the corrosion of moisture and chemicals to a certain extent, and protect the optical performance of the optical fiber. The coating layer 302 is made of acrylic ester material. Aramid fiber is a high-strength, low-density synthetic fiber. Wrapping aramid fiber around the coating layer 302 of the optical fiber can significantly improve the tensile strength of the optical fiber, so that the optical fiber will not break when subjected to large tensile forces.

[0024] It should be noted that the second shielding layer 304 is an aluminum foil shielding layer. The metal shielding layer can effectively block the interference of external electromagnetic fields on the optical signals inside the optical fiber, and at the same time prevent the optical fiber from being affected by static electricity, thus ensuring the stability of signal transmission.

[0025] In this embodiment, a first shielding layer 101 is provided between the optical fiber core body 1 and the tensile structure 3. The first shielding layer 101 is attached to the outer surface of the optical fiber core body 1, and the first shielding layer 101 and the second shielding layer 304 are made of the same material.

[0026] In this embodiment, the outer sheath structure 2 is composed of an outer protective sleeve 201, a corrosion-resistant layer 202, and a water-blocking layer 203. The outer sheath structure 2 abuts against the outer surface of the second shielding layer 304. The corrosion-resistant layer 202 is disposed on the outside of the outer protective sleeve 201, and the water-blocking layer 203 is disposed on the side of the corrosion-resistant layer 202 away from the outer protective sleeve 201.

[0027] Among them, the outer protective sleeve 201 is an LSZH sleeve. LSZH sleeves are usually composed of thermoplastic or thermosetting materials with low smoke emission when heated and no halogens. They are generally based on polyethylene (PE) and other materials, with the addition of inorganic substances such as magnesium hydroxide or aluminum hydroxide as flame retardants. When magnesium hydroxide or aluminum hydroxide is used as a flame retardant, the process of releasing water of crystallization by the flame retardant when heated can absorb a large amount of heat. The generated oxides are good refractory materials, and the released water vapor can suppress smoke, thereby playing a role in flame retardancy.

[0028] The working principle of the above embodiments is as follows:

[0029] First, a first shielding layer 101 is set to wrap the fiber core body 1. Then, a tensile structure 3 is used to provide initial protection for the fiber core body 1, improving the overall tensile strength of the multimode fiber. At the same time, a second shielding layer 304 is set to provide a double anti-crosstalk effect. An outer protective sleeve 201 is set to protect both the fiber core body 1 and the tensile structure 3. Furthermore, a corrosion-resistant layer 202 is set to improve the corrosion resistance of the outer protective sleeve 201. At the same time, a water-blocking layer 203 is set to improve the waterproof performance, making it suitable for more application scenarios.

[0030] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crosstalk immune multimode optical fiber comprising a fiber core body (1) and an outer sheath structure (2) disposed outside the fiber core body (1), characterized in that: A tensile-resistant structure (3) is arranged between the optical fiber inner core body (1) and the outer sheath structure (2); The tensile-resistant structure (3) comprises a buffer layer (301) arranged between the optical fiber inner core body (1) and the outer sheath structure (2), a coating layer (302) arranged on the side of the buffer layer (301) away from the optical fiber inner core body (1), and an aramid fiber layer (303) arranged on the side of the coating layer (302) away from the buffer layer (301).

2. The crosstalk immune multi-mode optical fiber of claim 1, wherein: The thickness of the buffer layer (301) is greater than the thickness of the coating layer (302) and the aramid fiber layer (303), and the aramid fiber layer (303) is wound on the outer surface of the coating layer (302).

3. The crosstalk immune multi-mode optical fiber of claim 1, wherein: The side of the aramid fiber layer (303) away from the coating layer (302) is provided with a second shielding layer (304).

4. The crosstalk immune multi-mode optical fiber of claim 1, wherein: The first shielding layer (101) is arranged between the optical fiber inner core body (1) and the tensile-resistant structure (3), and the first shielding layer (101) is attached to the outer surface of the optical fiber inner core body (1).

5. The crosstalk immune multi-mode optical fiber of claim 3, wherein: The outer sheath structure (2) is composed of an outer protective sleeve (201), a corrosion-resistant layer (202), and a water-blocking layer (203), and the outer surface of the second shielding layer (304) abuts against the outer sheath structure (2).

6. A multi-mode fiber according to claim 5, wherein: The corrosion-resistant layer (202) is arranged outside the outer protective sleeve (201), and the water-blocking layer (203) is arranged on the side of the corrosion-resistant layer (202) away from the outer protective sleeve (201).

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