An antiresonant optical fiber for communications and eye safety

Abstract

The present invention discloses an anti-resonance optical fiber for use in the fields of communication and human eye safety, and relates to the field of optical fiber communication technology. The present invention includes an outer cladding, a first inner cladding, a second inner cladding, a left air core region, and a right air core region in sequence from the outside to the inside along the radial direction of the optical fiber, and a plurality of first anti-resonance units are evenly distributed in a circle inside the first inner cladding. In the present invention, the left and right cores respectively work in the communication band and the 2μm band to realize the transmission of optical signals in the two bands, so as to realize the application in the fields of communication and human eye safety; both working bands have extremely low nonlinear coefficients, which are three orders of magnitude lower than ordinary single-mode optical fibers, so that the optical fiber can obtain a larger transmission power to achieve long-distance transmission, and the limiting loss is much lower than the existing single-mode optical fiber. At the same time, the highest waveguide dispersion in the working band of the optical fiber is two orders of magnitude lower than that of ordinary single-mode optical fibers.

Description

Technical Field

[0001] The invention relates to the technical field of optical fiber communication, in particular to an anti-resonance optical fiber used in the fields of communication and human eye safety. Background Art

[0002] Hollow-core antiresonant fiber has been widely used in recent years due to its novel and superior optical properties. Different from traditional solid-core optical fiber, the core of hollow-core antiresonant fiber is air, and the air core is mainly used as the light-guiding part. Compared with traditional solid-core optical fiber, hollow-core optical fiber can greatly reduce nonlinear effects and obtain lower transmission loss and waveguide dispersion. Optical communication generally uses light in the communication band of 1260nm-1625nm, especially lasers in the wavelength range of 1529.16nm-1560.61nm are often used in the field of optical communication; because lasers in the 2μm band are eye-safe and water molecules have a strong mid-infrared absorption peak near 2μm, lasers in this band are used in a variety of medical surgeries. This band is usually in the range of 1.8-2.26μm. However, in the 2μm band, due to the large transmission loss in single-mode optical fiber and the lack of dispersion compensation mechanism, the output indicators of 2μm band mode-locked fiber lasers are not ideal;

[0003] The current hollow-core anti-resonant optical fibers are mainly single-core structures with a single working band, and the working wavelengths are mostly narrow bands around 1.55μm. There are very few hollow-core anti-resonant optical fibers that can meet the dual-band working requirements of the communication band and the 2μm band. Summary of the invention

[0004] The purpose of the present invention is to provide an anti-resonant optical fiber for the fields of communication and eye safety, in which the left and right fiber cores respectively operate in the communication band and the 2μm eye safety band, and can realize dual-band single-mode light guidance; it not only has low restrictive loss in the two bands, but also has a large mode field area, extremely low waveguide dispersion flatness and extremely low nonlinear coefficient.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solutions: an anti-resonance optical fiber for communication and human eye safety, which comprises an outer cladding, a first inner cladding, a second inner cladding, a left air core region and a right air core region in order from outside to inside along the radial direction of the optical fiber, wherein a plurality of first anti-resonance units are evenly distributed in a circle inside the first inner cladding, and the plurality of first anti-resonance units together constitute the left air core region, and a plurality of second anti-resonance units are evenly distributed in a circle inside the second inner cladding, and the plurality of second anti-resonance units together constitute the right air core region;

[0006] The first anti-resonance unit comprises a first type of sector-shaped dielectric wall, a second type of elliptical arc dielectric wall is nested inside the first type of sector-shaped dielectric wall, a third type of circular dielectric wall is nested inside the second type of elliptical arc dielectric wall, the first type of sector-shaped dielectric wall and the second type of elliptical arc dielectric wall are fused to the outer cladding, and the third type of circular dielectric wall is tangent to the outer cladding and fused to the outer cladding;

[0007] The second anti-resonance unit includes a fourth type of elliptical arc dielectric wall, a fifth type of elliptical arc dielectric wall is nested in the fourth type of elliptical arc dielectric wall, a sixth type of elliptical arc dielectric wall is nested in the fifth type of elliptical arc dielectric wall, the fourth type of elliptical arc dielectric wall is fused to the surface of the fifth type of elliptical arc dielectric wall, and the fifth type of elliptical arc dielectric wall and the sixth type of elliptical arc dielectric wall are fused to the outer cladding.

[0008] Furthermore, the cross-sectional shape of the first type of sector-shaped dielectric wall is composed of an arc and two straight lines, the radius of the arc is 70μm-80μm, the central angle is 45°-60°, the straight line length is 35μm-50μm, and a chamfer is provided at the connection between the straight line and the arc, and the radius of the chamfer is 5μm-6μm.

[0009] Furthermore, the cross-sectional shape of the second type elliptical arc dielectric wall is set to be an elliptical arc with an arc angle of 94°-95°, and the major axis of the second type elliptical arc dielectric wall is 50μm-60μm, and the minor axis is 20μm-30μm.

[0010] Furthermore, the cross-sectional shape of the third type circular medium wall is circular, and its radius is 5 μm-8 μm.

[0011] Furthermore, the fourth type elliptical arc dielectric wall is set to an elliptical arc with an arc of 92°-93°, and the major axis of the fourth type elliptical arc dielectric wall is 115 μm-120 μm, and the minor axis is 75 μm-80 μm.

[0012] Furthermore, the cross-sectional shape of the fifth type elliptical arc dielectric wall is set to be an elliptical arc with an arc of 113°-114°, and the major axis of the fifth type elliptical arc dielectric wall is 140 μm-150 μm, and the minor axis is 90 μm-100 μm.

[0013] Furthermore, the cross-sectional shape of the sixth type elliptical arc dielectric wall is set to be an elliptical arc with an arc of 112°-113°, and the major axis of the sixth type elliptical arc dielectric wall is 40μm-50μm, and the minor axis is 130μm-140μm.

[0014] Furthermore, the dielectric walls of the outer cladding, the first inner cladding and the second inner cladding are all made of silica glass, and its refractive index is 1.44-1.45.

[0015] Furthermore, the thickness t of the first type of sector-shaped dielectric wall, the second type of elliptical arc dielectric wall, the third type of circular dielectric wall, the fourth type of elliptical arc dielectric wall, the fifth type of elliptical arc dielectric wall, and the sixth type of elliptical arc dielectric wall satisfies

[0016]

[0017] Where λ is the designed operating wavelength, represents the refractive index of the cladding silica glass, represents the refractive index of air, and l is the antiresonance order, which is a positive integer.

[0018] Furthermore, air is filled between the first type of sector-shaped dielectric wall and the second type of elliptical arc dielectric wall, inside the third type of circular dielectric wall, between the fourth type of elliptical arc dielectric wall and the fifth type of elliptical arc dielectric wall, between the sixth type of elliptical arc dielectric wall and the outer cladding, as well as the left air core region and the right air core region.

[0019] The present invention has at least the following beneficial effects:

[0020] In the present invention, the left and right fiber cores respectively work in the communication band and the 2μm band, realizing optical signal transmission in two bands to achieve applications in the fields of communication and eye safety; in both working bands, there are extremely low nonlinear coefficients, with the highest being only 0.036617S^3 / (kg*m^3), which is three orders of magnitude lower than that of ordinary single-mode optical fibers, so that the optical fiber can obtain a larger transmission power to achieve long-distance transmission, and the maximum limiting loss is only 1.99E-05dB / km, which is much lower than that of existing single-mode optical fibers. At the same time, the highest waveguide dispersion in the working band of the optical fiber is -0.016694 ps / (km*nm), which is two orders of magnitude lower than that of ordinary single-mode optical fibers.

[0021] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a cross-sectional view of the overall structure of the present invention;

[0023] Figure 2 It is a single-mode diagram of the air core region on the left side of the present invention;

[0024] Figure 3 It is a single-mode diagram of the right air core region in the present invention;

[0025] Figure 4 It is a schematic diagram of the limiting loss of the present invention when working in the communication band when it is used for optical communication;

[0026] Figure 5 It is a schematic diagram of waveguide dispersion when the present invention is used in optical communication and works in the communication band;

[0027] Figure 6 It is a schematic diagram of the effective mode field area of ​​the present invention when it is used in optical communication and works in the communication band;

[0028] Figure 7 It is a schematic diagram of the nonlinear coefficient of the present invention when working in the communication band when it is applied in optical communication;

[0029] Figure 8 It is a schematic diagram of the limiting loss of the present invention when it is applied in the field of human eye safety and works in the two-micrometer band;

[0030] Fig. 9 It is a schematic diagram of waveguide dispersion when the present invention is applied in the field of human eye safety and works in a two-micrometer band;

[0031] Fig.10 It is a schematic diagram of the effective mode field area when the present invention is applied in the field of human eye safety and works in the two-micrometer band;

[0032] Fig.11 It is a schematic diagram of the nonlinear coefficient of the present invention working in a two-micrometer band when applied in the field of human eye safety.

[0033] Reference numerals:

[0034] 1. Outer cladding; 2. First inner cladding; 3. Second inner cladding; 4. Left air core region; 5. Right air core region; 6. First type fan-shaped dielectric wall; 7. Second type elliptical arc dielectric wall; 8. Third type circular dielectric wall; 9. Fourth type elliptical arc dielectric wall; 10. Fifth type elliptical arc dielectric wall; 11. Sixth type elliptical arc dielectric wall; 12. Perfect matching layer. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present disclosure to clearly and completely describe the technical solutions in the embodiments of the present disclosure. Obviously, the described embodiments are only part of the embodiments of the present disclosure, rather than all the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0036] See also Figure 1-Figure 11 The present invention provides a technical solution: an anti-resonance optical fiber for communication and human eye safety, which includes an outer cladding 1, a first inner cladding 2, a second inner cladding 3, a left air core region 4 and a right air core region 5 in order from outside to inside along the radial direction of the optical fiber, a plurality of first anti-resonance units are evenly distributed in a circle inside the first inner cladding 2, and the plurality of first anti-resonance units together constitute the left air core region 4, a plurality of second anti-resonance units are evenly distributed in a circle inside the second inner cladding 3, and the plurality of second anti-resonance units together constitute the right air core region 5;

[0037] The first anti-resonance unit comprises a first type of sector-shaped dielectric wall 6, a second type of elliptical arc dielectric wall 7 is nested inside the first type of sector-shaped dielectric wall 6, a third type of circular dielectric wall 8 is nested inside the second type of elliptical arc dielectric wall 7, the first type of sector-shaped dielectric wall 6 and the second type of elliptical arc dielectric wall 7 are fused to the outer cladding 1, and the third type of circular dielectric wall 8 is tangent to the outer cladding 1 and fused to the outer cladding 1;

[0038] The second anti-resonance unit includes a fourth-type elliptical arc dielectric wall 9, a fifth-type elliptical arc dielectric wall 10 is nested in the fourth-type elliptical arc dielectric wall 9, a sixth-type elliptical arc dielectric wall 11 is nested in the fifth-type elliptical arc dielectric wall 10, the fourth-type elliptical arc dielectric wall 9 is fused to the surface of the fifth-type elliptical arc dielectric wall 10, and the fifth-type elliptical arc dielectric wall 10 and the sixth-type elliptical arc dielectric wall 11 are fused to the outer cladding 1.

[0039] With respect to the technical solution of this embodiment, the number of the first anti-resonance unit and the second anti-resonance unit are both set to 5-6, which is not limited in this embodiment and can be selected according to actual conditions. It should be noted that the right air core area 5 formed by a plurality of second anti-resonance units is larger than the left air core area 4 formed by a plurality of first anti-resonance units.

[0040] Furthermore, since the inner claddings of the first antiresonance unit and the second antiresonance unit have a multiple nested structure that is superior to the traditional single-layer dielectric tube hollow-core antiresonance optical fiber, the formed multi-layer resonant cavity can effectively reduce the leakage of optical signals, thereby achieving a better effect in reducing losses.

[0041] According to the technical solution of this embodiment, the cross-sectional shape of the first type of fan-shaped dielectric wall is composed of a circular arc and two straight lines. The radius of the circular arc is 70μm-80μm, the central angle is 45°-60°, the length of the straight line is 35μm-50μm, and a chamfer is provided at the connection between the straight line and the circular arc. The radius of the chamfer is 5μm-6μm. The fan-shaped dielectric wall with chamfered corners can be manufactured by a bundled wire drawing method, which is feasible in terms of manufacturing process. The first type of fan-shaped dielectric wall 6 changes the propagation path of photons by setting arcs and straight lines of specific angles and sizes, so that the light beam is more easily confined inside the fiber core.

[0042] According to the technical solution of this embodiment, the second-type elliptical arc dielectric wall 7 is set to an elliptical arc with an arc of 94°-95°, the major axis of the second-type elliptical arc dielectric wall 7 is 50μm-60μm, and the minor axis is 20μm-30μm. Specifically, since the major axis and minor axis of the second-type elliptical arc dielectric wall 7 are relatively large, the reflection area of ​​the light beam in these areas will also increase accordingly, which can effectively reduce light leakage and improve the transmission efficiency of optical signals.

[0043] According to the technical solution of this embodiment, the cross-sectional shape of the third type circular dielectric wall 8 is circular, and its radius is 5μm-8μm. The cross-sectional shape of the circular dielectric wall has no sharp corners, so it is not easy to deform or break when subjected to external force, which is also beneficial to reduce the loss caused by light leakage.

[0044] According to the technical solution of this embodiment, the fourth-type elliptical arc dielectric wall 9 is set to an elliptical arc with an arc of 92°-93°. The major axis of the fourth-type elliptical arc dielectric wall 9 is 115μm-120μm, and the minor axis is 75μm-80μm. Since the arc of the elliptical arc is larger, a larger mode field area can be provided, thereby suppressing the nonlinear effect, making the optical fiber more stable and reliable during high-speed transmission.

[0045] According to the technical solution of this embodiment, the fifth type elliptical arc dielectric wall 10 is set to an elliptical arc with an arc of 113°-114°, and the major axis of the fifth type elliptical arc dielectric wall 10 is 140μm-150μm, and the minor axis is 90μm-100μm.

[0046] According to the technical solution of this embodiment, the sixth type elliptical arc dielectric wall 11 is set to an elliptical arc with an arc of 112°-113°, and the major axis of the sixth type elliptical arc dielectric wall 11 is 40μm-50μm, and the minor axis is 130μm-140μm.

[0047] According to the technical solution of this embodiment, the dielectric walls of the outer cladding, the first inner cladding, and the second inner cladding are all made of silica glass, whose refractive index is 1.44-1.45. Silica glass has good plasticity and formability, and can be easily made into various complex structures and shapes. It also has good transparency and low light absorption loss. Using silica glass as the material not only ensures the basic performance of the optical fiber, but also reduces the manufacturing cost.

[0048] It should be noted that the thickness t of the first type of sector-shaped dielectric wall 6, the second type of elliptical arc dielectric wall 7, the third type of circular dielectric wall 8, the fourth type of elliptical arc dielectric wall 9, the fifth type of elliptical arc dielectric wall 10, and the sixth type of elliptical arc dielectric wall 11 satisfies:

[0049]

[0050] Where λ is the designed operating wavelength, represents the refractive index of the cladding silica glass, represents the refractive index of air, and l is the antiresonance order, which is a positive integer.

[0051] According to the technical solution of this embodiment, air is filled between the first sector-shaped dielectric wall 6 and the second elliptical arc dielectric wall 7, inside the third circular dielectric wall 8, between the fourth elliptical arc dielectric wall 9 and the fifth elliptical arc dielectric wall 10, between the sixth elliptical arc dielectric wall 11 and the outer cladding 1, as well as between the left air core region 4 and the right air core region 5.

[0052] Furthermore, a 5 μm perfect matching layer 12 is disposed outside the outer cladding 1, so that the boundary acts as a nearly ideal absorber or radiator domain.

[0053] Next, the technical solution of the present invention is further described in conjunction with specific embodiments:

[0054] According to the technical solution of this embodiment, the number of the first anti-resonance unit and the number of the second anti-resonance unit are both five;

[0055] The first type of sector-shaped dielectric wall 6 has an arc radius of 70 μm, a central angle of 45°, and a straight line length of 36.21 μm; the second type of elliptical arc dielectric wall 7 has a major axis of 60 μm, a minor axis of 30 μm, and an elliptical arc angle of 94°; the third type of circular dielectric wall 8 has a radius of 8 μm; the fourth type of elliptical arc dielectric wall 9 has an elliptical arc angle of 92°, a major axis of 120 μm, and a minor axis of 80 μm; the fifth type of elliptical arc dielectric wall 10 has an elliptical arc angle of 113°, a major axis of 150 μm, and a minor axis of 100 μm; the sixth type of elliptical arc dielectric wall 11 has an elliptical arc angle of 112°, a major axis of 40 μm, and a minor axis of 136 μm;

[0056] The COMSOL Multiphysics software was used to simulate the technical solution of this embodiment using the full vector finite element analysis method. Figure 2-Figure 11 , Figure 2 and Figure 3 It is a single-mode diagram of the air core region on the left and the air core region on the right. Figure 4 The optical fiber works in the communication band of 1500nm-1600nm, and the maximum limiting loss of the optical fiber is controlled at 10 -5 dB / km level, 10 times lower than the general single-mode optical fiber communication band -2 Order of magnitude loss; e.g. Figure 5 As shown in the figure, the maximum dispersion of light in this band is -0.012867ps / (km*nm), while the dispersion of general single-mode optical fiber working in the communication band is 1-6ps / (km*nm), which is much higher than this value; Figure 6 As shown, the mode field area of ​​the optical fiber is controlled within 10 -9 μm 2 Order of magnitude, such as Figure 7 The nonlinear coefficient is controlled at 10 -2S^3 / (kg*m^3) order of magnitude, a nonlinear coefficient 4 orders of magnitude lower than that of traditional optical fiber can be obtained; ultra-low loss and nonlinear coefficient can realize high-power optical signal transmission.

[0057] like Figure 8 As shown, the fiber operates in the 2μm band of 1700nm-2200nm, and the non-restrictive loss is less than 10 - 7 dB / km level, such as Fig.11 As shown, the nonlinear coefficient is also controlled at 10 -2 S^3 / (kg*m^3) order of magnitude, even up to 10 -3 Order of magnitude; e.g. Fig. 9 As shown in Figure 2, the dispersion of the optical fiber is still no higher than 10 in the 2μm band. -2 With the order of ps / (km*nm), the optical fiber is no longer limited by the lack of dispersion compensation mechanism in this band.

[0058] In summary, the left and right fiber cores of the present invention respectively work in the communication band and the 2μm band to realize optical signal transmission in two bands, so as to realize applications in the fields of communication and eye safety; both working bands have extremely low nonlinear coefficients, with the highest being only 0.036617S^3 / (kg*m^3), which is three orders of magnitude lower than that of ordinary single-mode optical fibers, so that the optical fiber can obtain a larger transmission power to achieve long-distance transmission, and the maximum limiting loss is only 1.99E-05 dB / km, which is much lower than that of existing single-mode optical fibers. At the same time, the highest waveguide dispersion in the working band of this optical fiber is -0.016694 ps / (km*nm), which is two orders of magnitude lower than that of ordinary single-mode optical fibers.

[0059] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0060] For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to the specific circumstances. When an element is referred to as being "assembled on", "installed on", "fixed on" or "set on" another element, it can be directly on the other element or there can also be a centered element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a centered element at the same time. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and are not intended to be the only implementation method.

[0061] 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.

[0062] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present disclosure. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

Claims

1. An antiresonant optical fiber for communication and eye safety, comprising an outer cladding (1), a first inner cladding (2), a second inner cladding (3), a left air core region (4) and a right air core region (5) in order from outside to inside along the radial direction of the optical fiber, characterized in that: A plurality of first anti-resonance units are evenly distributed in a circle inside the first inner cladding (2), and the plurality of first anti-resonance units together form a left air core region (4); a plurality of second anti-resonance units are evenly distributed in a circle inside the second inner cladding (3), and the plurality of second anti-resonance units together form a right air core region (5); The first anti-resonance unit comprises a first type of fan-shaped dielectric wall (6), a second type of elliptical arc dielectric wall (7) is nested inside the first type of fan-shaped dielectric wall (6), a third type of circular dielectric wall (8) is nested inside the second type of elliptical arc dielectric wall (7), the first type of fan-shaped dielectric wall (6) and the second type of elliptical arc dielectric wall (7) are fused to the outer cladding (1), and the third type of circular dielectric wall (8) is tangent to the outer cladding (1) and is fused to the outer cladding (1); The second anti-resonance unit comprises a fourth type elliptical arc dielectric wall (9), a fifth type elliptical arc dielectric wall (10) is nested in the fourth type elliptical arc dielectric wall (9), a sixth type elliptical arc dielectric wall (11) is nested in the fifth type elliptical arc dielectric wall (10), the fourth type elliptical arc dielectric wall (9) is fused to the surface of the fifth type elliptical arc dielectric wall (10), and the fifth type elliptical arc dielectric wall (10) and the sixth type elliptical arc dielectric wall (11) are fused to the outer cladding (1); The space between the first type of sector-shaped dielectric wall (6) and the second type of elliptical arc dielectric wall (7), the interior of the third type of circular dielectric wall (8), the space between the fourth type of elliptical arc dielectric wall (9) and the fifth type of elliptical arc dielectric wall (10), the space between the sixth type of elliptical arc dielectric wall (11) and the outer cladding (1), and the left air core region (4) and the right air core region (5) are all filled with air.

2. The anti-resonance optical fiber for communication and eye safety according to claim 1, characterized in that: The cross-sectional shape of the first type of sector-shaped dielectric wall (6) is composed of a circular arc and two straight lines, the radius of the circular arc is 70 μm-80 μm, the central angle is 45°-60°, the length of the straight line is 35 μm-50 μm, and a chamfer is provided at the connection between the straight line and the circular arc, and the radius of the chamfer is 5 μm-6 μm.

3. The anti-resonance optical fiber for communication and eye safety according to claim 2, characterized in that: The second type of elliptical arc dielectric wall (7) is set as an elliptical arc with an arc angle of 94°-95°, and the major axis of the second type of elliptical arc dielectric wall (7) is 50 μm-60 μm, and the minor axis is 20 μm-30 μm.

4. The anti-resonance optical fiber for communication and eye safety according to claim 2, characterized in that: The cross-sectional shape of the third type circular dielectric wall (8) is circular, and its radius is 5 μm-8 μm.

5. The anti-resonance optical fiber for communication and eye safety according to claim 4, characterized in that: The fourth type elliptical arc dielectric wall (9) is arranged as an elliptical arc with an arc angle of 92°-93°, and the major axis of the fourth type elliptical arc dielectric wall (9) is 115 μm-120 μm, and the minor axis is 75 μm-80 μm.

6. The anti-resonance optical fiber for communication and eye safety according to claim 5, characterized in that: The fifth type elliptical arc dielectric wall (10) is set as an elliptical arc with an arc of 113°-114°, and the fifth type elliptical arc dielectric wall (10) has a major axis of 140 μm-150 μm and a minor axis of 90 μm-100 μm.

7. The anti-resonance optical fiber for communication and eye safety according to claim 5, characterized in that: The sixth type elliptical arc dielectric wall (11) is arranged as an elliptical arc with an arc angle of 112°-113°, and the major axis of the sixth type elliptical arc dielectric wall (11) is 40 μm-50 μm, and the minor axis is 130 μm-140 μm.

8. The anti-resonance optical fiber for communication and eye safety according to claim 7, characterized in that: The dielectric walls of the outer cladding (1), the first inner cladding (2) and the second inner cladding (3) are all made of silica glass, the refractive index of which is 1.44-1.

45.

9. The anti-resonance optical fiber for communication and eye safety according to claim 8, characterized in that: The thickness t of the first type of sector-shaped dielectric wall (6), the second type of elliptical arc dielectric wall (7), the third type of circular dielectric wall (8), the fourth type of elliptical arc dielectric wall (9), the fifth type of elliptical arc dielectric wall (10), and the sixth type of elliptical arc dielectric wall (11) satisfies: Wherein, λ is the designed operating wavelength, n1 represents the refractive index of the cladding silica glass, n0 represents the refractive index of air, and l is the antiresonance order, which is a positive integer.

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