CN117233886A - Ultra-low loss bending insensitive single-mode optical fiber - Google Patents
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- CN117233886A CN117233886A CN202311277459.1A CN202311277459A CN117233886A CN 117233886 A CN117233886 A CN 117233886A CN 202311277459 A CN202311277459 A CN 202311277459A CN 117233886 A CN117233886 A CN 117233886A
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- 238000005452 bending Methods 0.000 title claims abstract description 30
- 239000013307 optical fiber Substances 0.000 title claims description 60
- 238000005253 cladding Methods 0.000 claims abstract description 102
- 239000010410 layer Substances 0.000 claims abstract description 72
- 239000012792 core layer Substances 0.000 claims abstract description 44
- 239000000835 fiber Substances 0.000 claims abstract description 39
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 15
- 230000007423 decrease Effects 0.000 claims abstract description 7
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 28
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 27
- 239000011737 fluorine Substances 0.000 claims description 27
- 229910052731 fluorine Inorganic materials 0.000 claims description 27
- 239000011248 coating agent Substances 0.000 claims description 21
- 238000000576 coating method Methods 0.000 claims description 21
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 16
- 239000011574 phosphorus Substances 0.000 claims description 14
- 229910052698 phosphorus Inorganic materials 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 10
- 229910052732 germanium Inorganic materials 0.000 claims description 10
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 10
- 230000003247 decreasing effect Effects 0.000 claims description 9
- 239000000460 chlorine Substances 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 claims description 6
- 229910052801 chlorine Inorganic materials 0.000 claims description 6
- 239000004925 Acrylic resin Substances 0.000 claims description 3
- 239000006185 dispersion Substances 0.000 claims description 2
- 230000003287 optical effect Effects 0.000 abstract description 9
- 230000005540 biological transmission Effects 0.000 abstract description 8
- 238000004891 communication Methods 0.000 abstract description 8
- 230000000052 comparative effect Effects 0.000 description 13
- 235000012239 silicon dioxide Nutrition 0.000 description 13
- 239000000377 silicon dioxide Substances 0.000 description 10
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 6
- 239000000463 material Substances 0.000 description 5
- 230000008859 change Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- 238000012681 fiber drawing Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000035772 mutation Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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Abstract
The invention discloses an ultra-low loss bending insensitive single-mode fiber, and relates to the technical field of optical communication transmission. The ultra-low loss bending insensitive single-mode fiber provided by the invention sequentially comprises a core layer, an inner cladding layer, a depressed cladding layer and an outer cladding layer from inside to outside, wherein the radius R1 of the core layer is 4.0-4.8 mu m, and the relative refractive index difference delta n1 is 0.1-0.2%; the radius R2 of the inner cladding is 7.2-15 mu m, and the relative refractive index difference delta n2 is formed by an inner relative refractive index difference delta n2-1 and an outer relative refractive index difference delta n2-2 from inside to outside in sequence; the relative refractive index difference delta n2-1 decreases from inside to outside, and delta n2-1 is 0.02-0.08%; the external relative refractive index difference delta n2-2 increases gradually from inside to outside, and delta n2-2 is-0.4% to-0.3%; the radius R3 of the depressed cladding is 24-40 mu m, and the relative refractive index difference delta n3 is-0.4% -0.3%; the radius R4 of the outer cladding is 62.5 mu m, the relative refractive index difference delta n4 is gradually reduced from inside to outside, and delta n4 is-0.1-0.05%.
Description
Technical Field
The invention relates to the technical field of optical communication transmission, in particular to an ultra-low loss bending insensitive single-mode optical fiber.
Background
With the rapid development of 5G construction in the global scope, optical communication networks are developed in the directions of long distance, large capacity and high speed. Communication networks are advancing toward next generation systems, and fiber optic infrastructure with large transmission capacity is the foundation of the next generation networks. The optical fiber has the characteristics of large transmission capacity, long transmission distance, high transmission speed and the like, and is widely applied to optical communication systems such as long-distance trunk lines, metropolitan area networks, access networks and the like.
With the rapid development of optical fiber communication technology, the existing g.652 optical fiber cannot meet the transmission of the 400G or even 1T high-speed optical communication trunk line, so that in order to meet the requirement of long-distance transmission, the requirement on optical fiber attenuation is increasing. Meanwhile, with The continuous development of FTTX (Fiber To The X), i.e. optical Fiber access in recent years, optical fibers are required To have better bending resistance in practical application, but existing g.652.d optical fibers cannot meet these requirements, so that technicians use g.657.d optical fibers, and because of The large difference between The mode field diameters of The g.652.d optical fibers and The g.657 optical fibers, the compatibility between The two optical fibers is poor, resulting in larger splicing loss and adverse effects on links.
In order to enable optical signals to be transmitted in an optical fiber, the core layer of the optical fiber needs to have a higher refractive index, and the cladding layer needs to have a lower refractive index, so that the optical signals can form total reflection in the core layer, and a technician generally obtains a proper refractive index difference by doping germanium materials in the core layer of the optical fiber to improve the refractive index of the core layer, and doping fluorine materials in the outer cladding layer to reduce the refractive index; however, the technical personnel also find that doping germanium material in the optical fiber core layer can cause the absorption of the doped germanium material besides the intrinsic absorption of silicon dioxide in the optical fiber core layer, and even the rayleigh scattering caused by doping the germanium material, which greatly influences the attenuation of the optical fiber, and the doping of the core layer and the cladding layer can easily cause large viscosity difference of the cladding layer of the core layer, the viscosity difference can cause stress difference between the core layer and the cladding layer, and the larger the difference is, the larger the attenuation of the optical fiber is.
Accordingly, in order to solve the above problems, the applicant devised an ultra-low loss bend insensitive single mode fiber that has low attenuation, small core-to-cladding viscosity differences, and is compatible with g.652.d fibers.
Disclosure of Invention
The following are definitions and illustrations of some terms involved in the present invention:
ppm to parts per million by weight.
The layer closest to the axis is defined as a core layer based on the change of refractive index from the centremost axis of the optical fiber, and the outer side of the core layer is a cladding layer.
The relative refractive index difference Δni of the layers of the fiber is defined by the following equation:
wherein n is i Is the refractive index of each layer of the optical fiber, n c Is the refractive index of pure silica.
The relative refractive index contribution Δge of the fiber core Ge doping is defined by the following equation:
wherein n is Ge To assume the Ge dopant of the core layer, the amount of change in refractive index of silicon dioxide induced in doping to pure silicon dioxide, n c Is the refractive index of pure silica.
The relative refractive index contribution Δfi of the fiber core and cladding F doping is defined by the following equation:
wherein n is Fi To assume that the F dopant of each layer of the core or cladding causes a change in the refractive index of the silica in doping to pure silica, n c Is the refractive index of pure silica.
In order to solve the existing technical problems. The invention provides an ultra-low loss bending insensitive single-mode fiber, which comprises a core layer and a cladding layer, wherein the cladding layer sequentially comprises an inner cladding layer, a depressed cladding layer and an outer cladding layer from inside to outside, the radius R1 of the core layer is 4.0-4.8 mu m, and the relative refractive index difference delta n1 is 0.1-0.2%; the radius R2 of the inner cladding is 7.2-15 mu m, and the relative refractive index difference delta n2 is formed by an inner relative refractive index difference delta n2-1 and an outer relative refractive index difference delta n2-2 from inside to outside in sequence; the relative refractive index difference delta n2-1 decreases from inside to outside, and delta n2-1 is 0.02-0.08%; the external relative refractive index difference delta n2-2 increases gradually from inside to outside, and delta n2-2 is-0.4% to-0.3%; the radius R3 of the depressed cladding is 24-40 mu m, and the relative refractive index difference delta n3 is-0.4% -0.3%; the radius R4 of the outer cladding is 62.5 mu m, the relative refractive index difference delta n4 decreases from inside to outside, and delta n4 is-0.1-0.05%; the ultra-low loss bending insensitive single-mode fiber has reasonable profile structure and parameter settings, the relative refractive index difference from the core layer to the outer cladding layer is gradually decreased from inside to outside, then gradually increased from inside to outside, finally gradually decreased from inside to outside, and the mutation is reduced, so that the viscosity between the core layer and the outer cladding layer is reasonably transited, the fiber stress is reduced, the fiber performance is improved, the attenuation is reduced, and meanwhile, the ultra-low loss bending insensitive single-mode fiber has good bending insensitive performance and can be compatible with the conventional G.652.D fiber.
Further, the core layer is a silica glass layer co-doped with germanium, fluorine and chlorine; the contribution delta Ge of the germanium doping in the core layer to the relative refractive index difference is 0.2% -0.3%, the contribution delta F1 of the fluorine doping to the relative refractive index difference is-0.1% -0%, and the contribution delta Cl of the chlorine doping to the relative refractive index difference is-0.05%.
Further, the inner cladding is a silicon dioxide glass layer co-doped with phosphorus and fluorine; the fluorine doping amount of the inner cladding layer is gradually increased from inside to outside; the phosphorus doping amount of the inner cladding is gradually reduced from inside to outside, and the phosphorus content is less than or equal to 100ppm; the contribution quantity delta F2 of fluorine doping in the inner cladding layer to the relative refractive index difference is gradually increased from shallow inside to deep outside, and delta F2 is-0.5% to-0.3%; the contribution quantity delta P of the phosphor doping in the inner cladding to the relative refractive index difference is in shallow decreasing inner depth and outer depth, and delta P is 0% -0.1%.
Further, the depressed cladding is a fluorine-doped silica glass layer, and the contribution quantity delta F3 of fluorine doping to the relative refractive index difference is-0.4% -0.3%.
Further, the outer cladding is a fluorine-doped silica glass layer; the fluorine doping amount in the outer cladding layer is gradually reduced from inside to outside; and the contribution quantity delta F4 of fluorine doping in the outer cladding layer to the relative refractive index difference is linearly reduced from the inner depth to the outer depth, and delta F4 is-0.4% to-0.05%.
Further, the outer side of the outer cladding is sequentially coated with an inner coating and an outer coating; the coating and the outer coating are both polyacrylic resin coating, the modulus of the inner coating is lower than 0.5Mpa, and the modulus of the outer coating is higher than 1000Mpa.
Further, annealing is performed by adopting an annealing furnace in the drawing process when the ultra-low loss bending insensitive optical fiber is processed, the annealing temperature is controlled to be 1200-1500 ℃, the drawing speed is 1300-1700 m/min, and the drawing tension of the bare optical fiber is 100-150 g.
Further, the mode field diameter of the ultra-low loss bend insensitive optical fiber is 8.9-9.2 μm.
Further, the cabled cutoff wavelength of the ultra-low loss bend insensitive optical fiber is less than or equal to 1260nm; the zero dispersion wavelength of the ultra-low loss bend insensitive optical fiber is 1305-1322nm.
Further, the ultra-low loss bend insensitive optical fiber has an attenuation of less than or equal to 0.174dB/km at a wavelength of 1550 nm.
Further, the macrobend loss of the ultra-low loss bending insensitive optical fiber, which is bent by 1 circle with the bending radius of R7.5mm, is less than 0.4dB at the wavelength of 1550nm, and is less than 0.8dB at the wavelength of 1625 nm; the ultra-low loss bending insensitive optical fiber has macrobending loss of less than 0.05dB when the R10mm bending radius is bent for 1 circle at the wavelength of 1550nm, and less than 0.12dB at the wavelength of 1625 nm.
After the technical scheme is adopted, the invention has the following beneficial effects:
(1) The ultra-low loss bending insensitive single-mode fiber has reasonable profile structure and parameter settings, the relative refractive index difference from the core layer to the outer cladding layer is gradually decreased from inside to outside, then gradually increased from inside to outside, finally gradually decreased from inside to outside, and the mutation is reduced, so that the viscosity of the core layer to the outer cladding layer is favorably and reasonably transited, the viscosity difference of the core layer cladding layer is small, the stress of the optical fiber is reduced, the optical fiber performance is improved, the attenuation is reduced, and meanwhile, the ultra-low loss bending insensitive single-mode fiber has good bending insensitive performance and can be compatible with the conventional G.652.D optical fiber.
(2) The core layer reduces Rayleigh scattering caused by concentration fluctuation by reducing the dosage of the germanium doping agent, reduces the viscosity of the core layer by co-doping fluorine and chlorine elements, enables the reticular structure of the core layer silicon dioxide to be relaxed, reduces stress mismatch at the center position of the core layer, and reduces the density non-uniformity of the optical fiber caused by the viscosity difference and the expansion coefficient difference in the drawing process, thereby effectively reducing the imaginary temperature and the Rayleigh scattering coefficient of the optical fiber and further reducing the attenuation of the optical fiber.
(3) The inner cladding layer realizes the trend that the relative refractive index difference of the inner cladding layer is linearly decreased and then linearly increased from inside to outside through the co-doping of the phosphorus and fluorine elements, a larger refractive index difference is formed in the ultra-low loss bending insensitive single-mode optical fiber, the concentration degree of an optical field in a core layer is improved, because the light intensity is distributed in a Gaussian mode, most of the power of the optical field is limited in the core layer, a barrier for preventing a tail field from escaping from an optical fiber is formed by the sunken cladding layer, the light field tail field of a fundamental mode is effectively limited, thereby effectively limiting the leakage of the fundamental mode, increasing the bending insensitivity of the optical fiber, doping phosphorus elements improves the refractive index of silicon dioxide, simultaneously reduces the viscosity of the inner cladding layer, enables the viscosity of the inner cladding layer to be matched with the core layer and the sunken cladding layer to be better, balances the structural relaxation time difference of the core layer and the inner cladding layer, reduces the interface defect caused by the viscosity difference in the drawing process, effectively reduces the Rayleigh scattering of the optical fiber, and further reduces the attenuation of the optical fiber.
(4) The fluorine doping amount of the outer cladding layer is gradually reduced from inside to outside, so that the external viscosity of the outer cladding layer is slightly higher than that of the inner cladding layer, the viscosity of the sinking cladding layer is matched with that of the outer cladding layer, the tensile stress on the core layer during optical fiber drawing is effectively reduced, and the optical fiber attenuation is further reduced.
(5) The optical fiber drawing process adopts an annealing process, the annealing temperature is controlled to be 1200-1500 ℃ and is close to the imaginary temperature of the optical fiber, the silicon dioxide network structure of the optical fiber can be further relaxed, and the structural relaxation time difference of the core layer and the inner cladding layer is balanced, so that the optical fiber attenuation is reduced.
Drawings
FIG. 1 is a cross-sectional view of a single mode fiber insensitive to ultra-low loss bending in accordance with one embodiment of the invention;
FIG. 2 is a refractive index profile of an ultra-low loss bend insensitive single mode fiber in accordance with one embodiment of the present invention;
the reference numerals are: the optical fiber comprises a core layer 1, an inner cladding layer 2, a depressed cladding layer 3, an outer cladding layer 4, a radius R1 of the core layer 1, a radius R2 of the inner cladding layer 2, a radius R3 of the depressed cladding layer 3, a radius R4 of the outer cladding layer 4, a relative refractive index difference Deltan 1 of the core layer 1, a relative refractive index difference Deltan 2 of the inner cladding layer 2, a relative refractive index difference Deltan 2-1, an outer relative refractive index difference Deltan 2-2, a relative refractive index difference Deltan 3 of the depressed cladding layer 3, and a relative refractive index difference Deltan 4 of the outer cladding layer 4.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
In the description of the embodiments of the present invention, it should be understood that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like indicate orientations or positional relationships based on those shown in the drawings, or those conventionally put in place when the inventive product is used, or those conventionally understood by those skilled in the art, merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or element to be referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
In the description of the embodiments of the present invention, it should also be noted that, unless explicitly specified and limited otherwise, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Examples
As shown in fig. 1-2, the ultra-low loss bending insensitive single-mode optical fiber of the embodiment sequentially comprises a core layer 1, an inner cladding layer 2, a depressed cladding layer 3 and an outer cladding layer 4 from inside to outside; the core layer 1 is a silicon dioxide glass layer co-doped with germanium, fluorine and chlorine; the inner cladding 2 tightly wraps the core layer 1, the inner cladding 2 is a silicon dioxide glass layer doped with phosphorus and fluorine, wherein the fluorine doping amount is gradually increased from inside to outside, the phosphorus doping amount is gradually reduced from inside to outside, the phosphorus content is less than or equal to 100ppm, the contribution amount delta F2 of the fluorine doping in the inner cladding 2 to the relative refractive index difference is gradually increased from inside to outside, and the contribution amount delta P of the phosphorus doping in the inner cladding 2 to the relative refractive index difference is gradually decreased from inside to outside; the depressed cladding 3 tightly wraps the inner cladding 2, and the depressed cladding 3 is a fluorine-doped silica glass layer; the outer cladding 4 tightly wraps the depressed cladding 3, the outer cladding 4 is a fluorine-doped silica glass layer, the fluorine doping amount in the outer cladding 4 is gradually reduced from inside to outside, and the contribution amount delta F4 of the fluorine doping in the outer cladding 4 to the relative refractive index difference is linearly reduced from inside to outside; the radius of the core layer 1 is R1, and the relative refractive index difference is delta n1; the radius of the inner cladding 2 is R2, the relative refractive index difference is delta n2-1 and the external relative refractive index difference is delta n2-2 from inside to outside, the relative refractive index difference is delta n2-1 from inside to outside, the external relative refractive index difference is delta n2-2 from inside to outside, and the relative refractive index difference is delta n2-2 from inside to outside; the radius of the depressed cladding 3 is R3, and the relative refractive index difference is delta n3; the radius of the outer cladding layer 4 is R4, and the relative refractive index difference delta n4 decreases from inside to outside; the outer side of the outer cladding layer is sequentially coated with an inner coating and an outer coating; the coating and the outer coating are both polyacrylic resin coating, the modulus of the inner coating is lower than 0.5Mpa, and the modulus of the outer coating is higher than 1000Mpa; the inner coating layer had a thickness of 185 μm and the outer coating layer had a thickness of 242 μm.
Comparative example 1
Comparative example 1 differs from the example only in that the relative refractive index difference Δn2 of the inner cladding is a constant value, and the remaining structure and parameters are the same as those of the example.
Comparative example 2
Comparative example 2 differs from the example only in that the remaining structure and parameters are the same as the example when the inner cladding is not doped with phosphorus.
Comparative example 3
Comparative example 3 differs from the example only in that the relative refractive index difference Δn4 of the outer cladding is a constant value, and the rest of the structure and parameters are the same as those of the example.
Comparative example 4
Comparative example 4 differs from the example only in that no annealing furnace was used at the time of drawing, and the structure and parameters of the optical fiber were the same as those of the example.
The refractive index profile parameters and the drawing process parameters of the ultra-low loss bend insensitive single mode fibers of examples 1 to 4 and comparative examples 1 to 4 of the present invention are shown in Table I
List one
The following Table II shows the test parameters of the ultra-low loss bend insensitive single mode fibers of examples 1-4 and comparative examples 1-4 of the present invention
Watch II
From tables one and two, it can be found that the ultralow-loss bend insensitive single-mode fibers of examples 1 to 4 have smaller bending loss and smaller fiber attenuation; as can be found from comparison of comparative examples 1 and 2 with examples 1 to 4, the inner cladding is co-doped with phosphorus and fluorine elements, and the relative refractive index difference of the inner cladding is linearly decreased from inside to outside and then linearly increased, so that the obtained ultra-low-loss bending insensitive single-mode fiber has smaller bending loss and smaller fiber attenuation; as can be seen from comparison of comparative example 3 with examples 1-4, the relative refractive index difference Δn4 of the outer cladding decreases from inside to outside, and the obtained ultra-low loss bend insensitive single mode fiber has smaller bending loss and smaller fiber attenuation; as can be seen from comparison of comparative example 4 with examples 1-4, the annealing temperature during the optical fiber drawing process is controlled between 1200-1500 ℃ and the obtained ultra-low loss bend insensitive single mode optical fiber has smaller bending loss and smaller optical fiber attenuation.
While the foregoing is directed to embodiments of the present invention, other and further details of the invention may be had by the present invention, it should be understood that the foregoing description is merely illustrative of the present invention and that no limitations are intended to the scope of the invention, except insofar as modifications, equivalents, improvements or modifications are within the spirit and principles of the invention.
Claims (10)
1. An ultra-low loss bending insensitive single mode fiber comprises a core layer (1) and a cladding layer, and is characterized in that the cladding layer sequentially comprises an inner cladding layer (2), a depressed cladding layer (3) and an outer cladding layer (4) from inside to outside, the radius R1 of the core layer (1) is 4.0-4.8 mu m, and the relative refractive index difference delta n1 is 0.1-0.2%; the radius R2 of the inner cladding (2) is 7.2-15 mu m, and the relative refractive index difference delta n2 is formed by an inner relative refractive index difference delta n2-1 and an outer relative refractive index difference delta n2-2 from inside to outside in sequence; the relative refractive index difference delta n2-1 decreases from inside to outside, and delta n2-1 is 0.02-0.08%; the external relative refractive index difference delta n2-2 increases gradually from inside to outside, and delta n2-2 is-0.4% to-0.3%; the radius R3 of the depressed cladding (3) is 24-40 mu m, and the relative refractive index difference delta n3 is-0.4% -0.3%; the radius R4 of the outer cladding (4) is 62.5 mu m, the relative refractive index difference delta n4 decreases from inside to outside, and delta n4 is-0.1-0.05%.
2. The ultra-low loss bend insensitive single mode optical fiber according to claim 1 wherein the core layer (1) is a silica glass layer co-doped with germanium, fluorine, chlorine; the contribution delta Ge of germanium doping to the relative refractive index difference in the core layer (1) is 0.2% -0.3%, the contribution delta F1 of fluorine doping to the relative refractive index difference is-0.1% -0%, and the contribution delta Cl of chlorine doping to the relative refractive index difference is-0.05%.
3. The ultra-low loss bend insensitive single mode optical fiber according to claim 1 wherein the inner cladding (2) is a silica glass layer co-doped with phosphorus and fluorine; the fluorine doping amount of the inner cladding (2) is gradually increased from inside to outside; the phosphorus doping amount of the inner cladding (2) is gradually reduced from inside to outside, and the phosphorus content is less than or equal to 100ppm; the contribution quantity delta F2 of fluorine doping in the inner cladding (2) to the relative refractive index difference is gradually increased from the inner shallow to the outer deep, and delta F2 is-0.5% to-0.3%; the contribution quantity delta P of the phosphor doping in the inner cladding (2) to the relative refractive index difference is in shallow decreasing inner depth and outer depth, and delta P is 0% -0.1%.
4. The ultra-low loss bend insensitive single mode optical fiber according to claim 1 wherein the outer cladding (4) is a fluorine doped silica glass layer; the fluorine doping amount in the outer cladding layer (4) is gradually reduced from inside to outside; the contribution quantity delta F4 of fluorine doping in the outer cladding layer (4) to the relative refractive index difference is linearly reduced from inside to outside, and delta F4 is-0.4% to-0.05%.
5. The ultra-low loss bend insensitive single mode optical fiber according to claim 1, wherein the outer side of the outer cladding (4) is coated with an inner coating and an outer coating in sequence; the coating and the outer coating are both polyacrylic resin coating, the modulus of the inner coating is lower than 0.5Mpa, and the modulus of the outer coating is higher than 1000Mpa.
6. The ultra-low loss bend insensitive single mode fiber according to claim 1, wherein the annealing is performed by an annealing furnace in the drawing process of the ultra-low loss bend insensitive single mode fiber, the annealing temperature is controlled between 1200 ℃ and 1500 ℃, the drawing speed is 1300 m/min to 1700m/min, and the drawing tension of the bare fiber is 100 g to 150g.
7. The ultra-low loss bend insensitive single mode fiber according to claim 1 wherein the mode field diameter of the ultra-low loss bend insensitive fiber is 8.9-9.2 μm.
8. The ultra-low loss bend insensitive single mode fiber according to claim 1 wherein the cabled cutoff wavelength of the ultra-low loss bend insensitive fiber is less than or equal to 1260nm; the zero dispersion wavelength of the ultra-low loss bend insensitive optical fiber is 1305-1322nm.
9. The ultra-low loss bend insensitive single mode fiber according to claim 1 wherein the ultra-low loss bend insensitive fiber attenuates less than or equal to 0.174dB/km at a wavelength of 1550 nm.
10. The ultra-low loss bend insensitive single mode fiber according to claim 1 wherein the ultra-low loss bend insensitive fiber has a macrobend loss of less than 0.4dB for a bend radius of r7.5mm for 1 turn at a wavelength of 1550nm and less than 0.8dB at a wavelength of 1625 nm; the ultra-low loss bending insensitive optical fiber has macrobending loss of less than 0.05dB when the R10mm bending radius is bent for 1 circle at the wavelength of 1550nm, and less than 0.12dB at the wavelength of 1625 nm.
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