A nodeless anti-resonant hollow core fiber based on a negative curvature jacketed medium tube

Abstract

The application discloses a kind of based on negative curvature outer sleeve medium tube's nodeless anti-resonant hollow core fiber, including first type medium tube, second type medium tube and first type outer sleeve medium tube, the first type medium tube is fixed on the arc inner wall of the first type outer sleeve medium tube by excircle, the first type medium tube is fixedly connected with the second type medium tube by incircle, and tangent point and the connecting point of the first type medium tube and the first type outer sleeve medium tube are in the same position, there is no node between the second type medium tube.The application uses the above-mentioned one based on negative curvature outer sleeve medium tube's nodeless anti-resonant hollow core fiber, fiber core has negative curvature boundary, outer sleeve tube has negative curvature boundary, fiber has multiple anti-resonant layers, fiber cladding has no node, no loss peak caused by transverse node, effectively reduce the limit loss, increase transmission bandwidth.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical fiber technology, and in particular to a nodeless anti-resonant hollow core fiber based on a negative curvature cladding medium tube. BACKGROUND

[0002] Optical fiber technology is widely used in the development of the national economy, involving industrial manufacturing, information communication technology, medical safety, aerospace, laser transmission and many other fields, and is an indispensable part of new infrastructure and space-earth integration construction. Since the 21st century, with the explosive growth of data transmission capacity, the continuous improvement of optical fiber laser power, and the urgent application needs of complex sensing arrays in extreme environments, the physical intrinsic defects of quartz as an optical fiber material have gradually become prominent, becoming a bottleneck that traditional solid core optical fibers cannot break through, which has made the existing optical fiber technology industry once in a dilemma, and the Internet is about to face a light capacity crisis.

[0003] In contrast, hollow core optical fibers confine light in air cores rather than traditional doped silica cores, which can completely liberate the material restrictions in the application of optical fiber technology. Due to its excellent optical performance in transmission bandwidth, laser damage threshold, transmission rate and single mode, hollow core optical fibers have achieved explosive development in recent years and have become the forefront of the current world optical fiber research hotspot, providing an important driving force for the development of optical fiber communication, high-energy laser transmission, sensing, ultrafast optics and other fields.

[0004] Researchers hope to reduce the difficulty of preparation while reducing the loss of anti-resonant hollow core fiber, and use a single layer of anti-resonant layer to limit the leakage of light transmission. F. Yu et al. [F. Yu, W. J. Wadsworth, and J. C. Knight, Low loss silica hollow core fibers for 3-4 μm spectral region [J]. Opt. Express, 2012, 20(10): 11153-11158] proposed a single-resonant layer negative curvature anti-resonant hollow core fiber, which is simpler in structure than the Kagome cladding structure of the hollow core fiber. However, the nodes and only one anti-resonant layer in this fiber lead to insufficiently low loss. Subsequently, it was found that the nested circular dielectric tube can be added in the anti-resonant unit, thereby greatly reducing the loss. W. J. Belardi [W. Belardi, Design and properties of hollow antiresonant fibers for the visible and near infrared spectral range [J]. J. Lightw. Technol, 2015, 32: 4497-4503] successfully prepared a nested negative curvature hollow core fiber, which has a large difference in thickness between the dielectric tubes and a large number of anti-resonant units, making it difficult to accurately control the size and position of each nested dielectric tube. In 2018, Ying-ying Wang et al. [Shou-fei Gao, Ying-ying Wang, Wei Ding, et al. Hollow-core conjoined-tube negative-curvature fibre with ultralow loss [J]. Nat. Commun, 2018, 9(1)] published a multi-resonant layer anti-resonant hollow core fiber with cladding nodes, called conjoined hollow core fiber. During the preparation process, the positions of the nodes in the cladding need to be accurately arranged to minimize their negative impact on the loss of the fiber. F. Amrani et al. [F. Amrani, J. H. Osório, F. Delahaye, et al. Low-loss single-mode hybrid-lattice hollow-core photonic-crystal fibre [J]. Light: Science & Applications, 2021, 10(1)] proposed a hybrid-lattice hollow-core photonic-crystal fiber. Due to the existence of loss peaks, the loss of this fiber fluctuates greatly and has a very narrow bandwidth. Therefore, it is urgent to develop an easily prepared, low-loss, high-bandwidth hollow core fiber without cladding nodes. SUMMARY

[0005] The application aims to provide a nodeless anti-resonant hollow core fiber based on a negative curvature cladding tube, the fiber core has a negative curvature boundary, the cladding tube has a negative curvature boundary, the fiber has multiple anti-resonant layers, the fiber cladding is nodeless, there is no loss peak caused by transverse nodes, the confinement loss is effectively reduced, and the transmission bandwidth is increased.

[0006] To achieve the above-mentioned purpose, the application provides a nodeless anti-resonant hollow core fiber based on a negative curvature cladding tube, which comprises a first type of medium tube, a second type of medium tube and a first type of cladding tube, the first type of medium tube is fixed on the arc-shaped inner wall of the first type of cladding tube in an inscribed manner, the first type of medium tube is fixedly connected with the second type of medium tube in an inscribed manner, and the tangent point and the connecting point of the first type of medium tube and the first type of cladding tube are located at the same position, and there is no node between the second type of medium tubes.

[0007] Preferably, the area surrounded by the outer wall of the first type of medium tube forms a first type of hole, i.e., a core area, the area between the first type of medium tube and the first type of cladding tube is a second type of hole, the inner area of the second type of medium tube is a third type of hole, and the area between the first type of medium tube and the second type of medium tube is a fourth type of hole.

[0008] Preferably, the first type of cladding tube has a negative curvature inner boundary.

[0009] Preferably, the number of the first type of medium tubes is 4, 5 or 6.

[0010] Preferably, the material of the fiber is any one of silica, soft glass or plastic.

[0011] Therefore, the application adopts the above-mentioned nodeless anti-resonant hollow core fiber based on a negative curvature cladding tube, the fiber core has a negative curvature boundary, the cladding tube has a negative curvature boundary, the fiber has multiple anti-resonant layers, the fiber cladding is nodeless, there is no loss peak caused by transverse nodes, the confinement loss is effectively reduced, and the transmission bandwidth is increased.

[0012] The technical solutions of the application will be further described in detail below with reference to the drawings and examples. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 is a structural schematic diagram of an anti-resonant hollow core fiber of a nodeless anti-resonant hollow core fiber based on a negative curvature cladding tube according to the application, embodiment 1;

[0014] Figure 2 is a structural schematic diagram of an anti-resonant hollow core fiber of a nodeless anti-resonant hollow core fiber based on a negative curvature cladding tube according to the application, embodiment 2;

[0015] Figure 3 This is a schematic diagram of the anti-resonant hollow fiber structure of Embodiment 3 of the present invention, which is based on a negative curvature jacketed dielectric tube and is a nodeless anti-resonant hollow fiber.

[0016] Figure Labels

[0017] 1. Type I medium tube; 2. Type II medium tube; 3. Type I outer medium tube; 4. Type I hole; 5. Type II hole; 6. Type III hole; 7. Type IV hole. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Unless otherwise defined, the technical or scientific terms used in this invention shall have the ordinary meaning understood by one of ordinary skill in the art to which this invention pertains. The terms "first," "second," and similar terms used in this invention do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as "comprising" or "including" mean that the element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as "connected" or "linked" are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. Terms such as "upper," "lower," "left," and "right" are used only to indicate relative positional relationships; when the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0020] Example 1

[0021] This invention provides an anti-resonant hollow-core optical fiber based on a negative curvature jacketed dielectric tube, such as... Figure 1 As shown, the optical fiber consists of a first-type dielectric tube 1, a second-type dielectric tube 2, and a first-type outer dielectric tube 3. The first-type outer dielectric tube 3 has a negative curvature boundary. The first-type dielectric tube 1 is fixed to the inner wall of the first-type outer dielectric tube 3 by external tangent, making the position of the optical fiber less prone to change.

[0022] The first type of medium tube 1 and the second type of medium tube 2 are connected in a tangent manner, and the tangent point is located at the same position as the connection point of the first type of medium tube 1 and the first type of outer sleeve medium tube 3, and there is no node between the second type of medium tube 2, thereby reducing loss and increasing transmission bandwidth. The area surrounded by the outer wall of the first type of medium tube 1 forms a first type of hole 4, that is, a core area, the core area is a central area with a higher refractive index than adjacent areas in the optical waveguide, and the core area is used for transmitting optical signals. The area between the first type of medium tube 1 and the first type of outer sleeve medium tube 3 is a second type of hole 5, the area in the second type of medium tube 2 is a third type of hole 6, and the area between the first type of medium tube 1 and the second type of medium tube 2 is a fourth type of hole 7.

[0023] The first type of outer sleeve medium tube 3 is a negative curvature boundary, and the second type of hole 5 is an air area. The number of the first type of medium tube 1 is 6; and the optical fiber material is any one of silica, soft glass or plastic.

[0024] At a wavelength of 1.06 μm, the outer diameter of the first type of medium tube 1 is 14 μm, the outer diameter of the second type of medium tube 2 is 5.6 μm, and the thickness of all the medium tubes is 0.42 μm. The numerical simulation obtains a limited loss of the fundamental mode of 0.15 dB / km, and the distribution ratio of mode energy in air is 99.992%. The lowest limit loss in the near-infrared waveband is 0.072 dB / km, the operating wavelength is in the waveband of 0.972 μm-1.653 μm, the limit loss of the core fundamental mode is less than 1 dB / km, and the bandwidth is 681 nm.

[0025] Example Two

[0026] The application provides a negative curvature outer sleeve medium tube-based anti-resonant hollow optical fiber, as shown in Figure 2 The number of the first type of medium tube 1 is 5, and the others are the same as in Example One.

[0027] Due to the different number of the first type of medium tube 1, the outer diameter and other data of the first type of medium tube are also different, and corresponding data are obtained by simulation and simulation using COMSOL software.

[0028] Example Three

[0029] The application provides a negative curvature outer sleeve medium tube-based anti-resonant hollow optical fiber, as shown in Figure 3 The number of the first type of medium tube 1 is 4, and the others are the same as in Example One.

[0030] Due to the different number of the first type of medium tube 1, the outer diameter and other data of the first type of medium tube are also different, and corresponding data are obtained by simulation and simulation using COMSOL software.

[0031] Therefore, the application adopts the above-mentioned nodeless anti-resonant hollow core fiber based on a negative curvature cladding medium tube, the fiber core has a negative curvature boundary, the cladding tube has a negative curvature boundary, the fiber has multiple anti-resonant layers, the fiber cladding is nodeless, and the loss peak caused by the transverse node is effectively reduced, the confinement loss is reduced, and the transmission bandwidth is increased.

[0032] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can still be modified or replaced by equivalents, and these modifications or replacements cannot make the modified technical solutions deviate from the spirit and scope of the technical solutions of the present application.

Claims

1. A nodeless anti-resonant hollow core fiber based on a negative curvature jacketed medium tube, characterized by: The first type of medium tube is fixed on the arc-shaped inner wall of the first type of sheath medium tube by excircle, the first type of medium tube is fixedly connected with the second type of medium tube by incircle, and the connection point of the first type of medium tube and the first type of sheath medium tube is at the same position, and there is no node between the second type of medium tubes.

2. A nodeless anti-resonant hollow core fiber based on a medium tube of negative curvature jacket according to claim 1, characterized in that: The area surrounded by the outer wall of the first type of medium tube forms a first type of hole, that is, a core area, the area between the first type of medium tube and the first type of sheath medium tube is a second type of hole, the inner area of the second type of medium tube is a third type of hole, and the area between the first type of medium tube and the second type of medium tube is a fourth type of hole.

3. A nodeless anti-resonant hollow core fiber based on a medium tube of negative curvature jacket according to claim 1, characterized in that: The first type of sheath medium tube is a negative curvature inner boundary.

4. A nodeless anti-resonant hollow core fiber based on a medium tube of negative curvature jacket according to claim 1, characterized in that: The number of the first type of medium tube is 4, 5 or 6.

5. A nodeless anti-resonant hollow core fiber based on a medium tube of negative curvature jacket according to claim 2, characterized in that: The optical fiber material is any one of silica, soft glass or plastic.

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