CN117406336A - Radiation-resistant single-mode optical fiber - Google Patents
Radiation-resistant single-mode optical fiber Download PDFInfo
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- CN117406336A CN117406336A CN202311383301.2A CN202311383301A CN117406336A CN 117406336 A CN117406336 A CN 117406336A CN 202311383301 A CN202311383301 A CN 202311383301A CN 117406336 A CN117406336 A CN 117406336A
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- 239000013307 optical fiber Substances 0.000 title claims description 53
- 230000005855 radiation Effects 0.000 title claims description 16
- 238000005253 cladding Methods 0.000 claims abstract description 182
- 239000010410 layer Substances 0.000 claims abstract description 77
- 239000012792 core layer Substances 0.000 claims abstract description 46
- 230000000994 depressogenic effect Effects 0.000 claims abstract description 45
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims abstract description 20
- LIQLLTGUOSHGKY-UHFFFAOYSA-N [B].[F] Chemical compound [B].[F] LIQLLTGUOSHGKY-UHFFFAOYSA-N 0.000 claims abstract description 6
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 12
- 229910052731 fluorine Inorganic materials 0.000 claims description 12
- 239000011737 fluorine Substances 0.000 claims description 12
- 102100036466 Delta-like protein 3 Human genes 0.000 claims description 8
- 101710112748 Delta-like protein 3 Proteins 0.000 claims description 8
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 6
- 229910052796 boron Inorganic materials 0.000 claims description 6
- 101000872084 Danio rerio Delta-like protein B Proteins 0.000 claims 1
- 108700041286 delta Proteins 0.000 claims 1
- 239000000835 fiber Substances 0.000 abstract description 9
- 239000007789 gas Substances 0.000 description 45
- 238000000151 deposition Methods 0.000 description 22
- 230000008021 deposition Effects 0.000 description 22
- 229910003910 SiCl4 Inorganic materials 0.000 description 20
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 20
- 230000005540 biological transmission Effects 0.000 description 11
- 238000000034 method Methods 0.000 description 8
- 238000005137 deposition process Methods 0.000 description 7
- 238000004519 manufacturing process Methods 0.000 description 6
- 229910015844 BCl3 Inorganic materials 0.000 description 5
- 238000005452 bending Methods 0.000 description 5
- 230000003287 optical effect Effects 0.000 description 5
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 229910052732 germanium Inorganic materials 0.000 description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 3
- OIGNJSKKLXVSLS-VWUMJDOOSA-N prednisolone Chemical compound O=C1C=C[C@]2(C)[C@H]3[C@@H](O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 OIGNJSKKLXVSLS-VWUMJDOOSA-N 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005229 chemical vapour deposition Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 230000005670 electromagnetic radiation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- PVADDRMAFCOOPC-UHFFFAOYSA-N oxogermanium Chemical compound [Ge]=O PVADDRMAFCOOPC-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000012495 reaction gas Substances 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 230000008054 signal transmission Effects 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03605—Highest refractive index not on central axis
Abstract
The application relates to an irradiation-resistant single-mode fiber which comprises a core layer, a matched cladding layer, a depressed cladding layer, an inner cladding layer and an outer cladding layer which are sequentially arranged from inside to outside; the core layer adopts fluorine-doped gradient quartz glass; the matched cladding adopts fluorine-doped quartz glass; the depressed cladding adopts boron-fluorine co-doped quartz glass; the inner cladding adopts fluorine-doped quartz glass. The application has stronger irradiation resistance.
Description
Technical Field
The application relates to the field of optical fiber communication and optical transmission, in particular to an irradiation-resistant single-mode optical fiber.
Background
Optical fiber data communication is growing at an exponential rate, and the transmission capacity of conventional optical fibers is rapidly increased by the application of time division multiplexing, wavelength division multiplexing and other technologies, so that the transmission capacity approaches the shannon limit of 100Tb/s.
In some special application scenarios, such as aerospace, deep sea detection, nuclear power station and other high-radiation environments, traditional optical fiber communication is easily distorted by electromagnetic radiation interference, so that the quality of optical signal transmission is reduced. This is because irradiation causes rearrangement of the structure of the silica atoms in the optical fiber to form defects, i.e., a "color center", and studies have shown that the more the germanium content in the optical fiber is, the more the germanium-oxygen defects are, which causes rapid increase in optical transmission loss and also reduces the mechanical life of the optical fiber.
Therefore, it is necessary to improve the bending resistance and irradiation resistance of the optical fiber for extreme environments to ensure that the transmission performance of the optical fiber is not deteriorated.
Disclosure of Invention
The embodiment of the application provides an irradiation-resistant single-mode fiber which has stronger irradiation resistance.
The embodiment of the application provides an irradiation-resistant single-mode fiber, which comprises a core layer, a matched cladding layer, a depressed cladding layer, an inner cladding layer and an outer cladding layer which are sequentially arranged from inside to outside;
the core layer adopts fluorine-doped gradient quartz glass;
the matched cladding adopts fluorine-doped quartz glass;
the depressed cladding adopts boron-fluorine co-doped quartz glass;
the inner cladding adopts fluorine-doped quartz glass.
In some embodiments, the absolute refractive index of the core layer is a power exponent distribution as follows:
n 2 (r)＝n core center 2 [1-0.25(r/a) β ]；
Wherein n is Core center The absolute refractive index of the central position of the core layer is that r is the distance between different positions of the core layer and the central position of the core layer, a is the radius of the core layer, and beta is the exponent.
In some embodiments, the exponent β has a value of 1.85 to 2.10.
In some embodiments, the relative refractive index difference Δ1 between the core and the outer cladding is a maximum of-0.45% to-0.28%.
In some embodiments, the matched cladding, depressed cladding, and inner cladding all have a step-like profile in refractive index;
the maximum value of the relative refractive index difference delta 2 between the matched cladding and the outer cladding is-0.60% -0.72%;
the maximum value of the relative refractive index difference delta 3 between the depressed cladding and the outer cladding is-1.0% -1.2%;
the maximum value of the relative refractive index difference delta 4 between the inner cladding and the outer cladding is-0.60% to-0.72%.
In some embodiments, the matched cladding relative refractive index difference Δ2 is equal to the inner cladding relative refractive index difference Δ4.
In some embodiments, in the depressed cladding, the contribution amount Δb of boron to the relative refractive index difference Δ3 is-0.30% to-0.45%, and the contribution amount Δf of fluorine to the relative refractive index difference Δ3 is-0.70% to-0.75%.
In some embodiments, the core diameter D1 is 6.0-10.0 μm, the matched cladding diameter D2 is 15.0-20.0 μm, the depressed cladding diameter D3 is 25.0-35.0 μm, the inner cladding diameter D4 is 80.0-100.0 μm, and the outer cladding diameter D5 is 125.0 μm.
In some embodiments, the inner cladding has an annular air hole layer formed therein, the annular air hole layer including a plurality of air holes.
In some embodiments, the annular air hole layer comprises air holes with a center forming a circle having a diameter of 50-60 μm and a diameter of 5-10 μm.
The beneficial effects that technical scheme that this application provided brought include:
according to the irradiation-resistant single-mode optical fiber, germanium is not doped in the core layer, so that the transmission loss can be greatly reduced; the core layer gradient fluorine doping is realized by optimizing the waveguide design and adjusting the fluorine doping amount, so that the generation of color center is effectively reduced, the stress is reduced, the transmission loss of optical signals of the single-mode optical fiber is reduced, the low attenuation performance is realized, and the single-mode optical fiber has stronger irradiation resistance.
Boron element doping is introduced in the sinking cladding deposition process, neutrons are effectively absorbed, and the energy of the neutrons is reduced, so that the irradiation influence of radiation on the optical fiber is reduced, and further the single-mode optical fiber has stronger irradiation resistance. And the boron-fluorine co-doped depressed cladding realizes good bending resistance and excellent transmission performance.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a cross-sectional view of a radiation-resistant single-mode optical fiber provided in an embodiment of the present application;
FIG. 2 is a perspective view of a radiation-resistant single-mode optical fiber provided in an embodiment of the present application;
fig. 3 is a refractive index profile of a radiation-resistant single-mode fiber provided in an embodiment of the present application.
In the figure: 1. a core layer; 2. matching the cladding; 3. sinking the cladding; 4. an inner cladding; 5. an outer cladding; 6. an air hole.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present application based on the embodiments herein.
Referring to fig. 1 and 2, an embodiment of the present application provides an irradiation-resistant single-mode optical fiber, which includes a core layer 1, a matching cladding layer 2, a depressed cladding layer 3, an inner cladding layer 4, and an outer cladding layer 5 sequentially arranged from inside to outside along a radial direction of the irradiation-resistant single-mode optical fiber; the core layer 1 is made of fluorine-doped graded quartz glass; the matched cladding 2 adopts fluorine-doped quartz glass; the depressed cladding 3 adopts boron-fluorine co-doped quartz glass; the inner cladding 4 adopts fluorine-doped quartz glass; the outer cladding 5 is pure quartz glass and is undoped.
According to the irradiation-resistant single-mode optical fiber, germanium is not doped in the core layer, so that the transmission loss can be greatly reduced; the core layer gradient fluorine doping is realized by optimizing the waveguide design and adjusting the fluorine doping amount, so that the generation of color center is effectively reduced, the stress is reduced, the transmission loss of optical signals of the single-mode optical fiber is reduced, the low attenuation performance is realized, and the single-mode optical fiber has stronger irradiation resistance.
Boron element doping is introduced in the sinking cladding deposition process, neutrons are effectively absorbed, and the energy of the neutrons is reduced, so that the irradiation influence of radiation on the optical fiber is reduced, and further the single-mode optical fiber has stronger irradiation resistance. And the boron-fluorine co-doped depressed cladding realizes good bending resistance and excellent transmission performance.
The absolute refractive index of the core layer 1 is in the following power exponent distribution:
n 2 (r)＝n core center 2 [1-0.25(r/a) β ]；
Wherein n is Core center The absolute refractive index of the central position of the core layer 1 is that r is the distance from the different positions of the core layer 1 to the central position of the core layer 1, a is the radius of the core layer 1, beta is the exponent, and the value of the exponent beta is 1.85-2.10.
The relative refractive index difference Δi is calculated using the following formula:
△i＝(n i -n 0 )/n 0 ×100％
wherein n is 0 The refractive index of the outer cladding 5 is that of pure quartz glass.
When calculating the relative refractive index difference Δ1 of the core 1 with respect to the outer cladding 5, n in the above formula i Refractive index n of core layer 1 1 ；
When calculating the relative refractive index difference Delta2 of the matched cladding 2 with respect to the outer cladding 5, n in the above formula i For matching the refractive index of the cladding 2n 2 ；
When calculating the relative refractive index difference Delta3 of the depressed cladding 3 with respect to the outer cladding 5, n in the above formula i Refractive index n of depressed cladding 3 3 。
When calculating the relative refractive index difference Delta4 of the inner cladding 4 with respect to the outer cladding 5, n in the above formula i Refractive index n of inner cladding 4 4 。
Referring to fig. 3, the maximum value of the relative refractive index difference Δ1 between the core layer 1 and the outer cladding layer 5 is-0.45% to-0.28%, and the contribution amount Δf of fluorine in the core layer 1 is-0.45% to-0.28%.
The refractive indexes of the matched cladding 2, the depressed cladding 3 and the inner cladding 4 are distributed in a step type;
the maximum value of the relative refractive index difference delta 2 between the matched cladding 2 and the outer cladding 5 is-0.60% -0.72%, and the contribution delta F of fluorine in the matched cladding 2 is-0.60% -0.72%;
the maximum value of the relative refractive index difference delta 3 between the depressed cladding 3 and the outer cladding 5 is-1.0% -1.2%, the contribution delta B of boron to the relative refractive index difference delta 3 in the depressed cladding 3 is-0.30% -0.45%, and the contribution delta F of fluorine to the relative refractive index difference delta 3 is-0.70% -0.75%;
the maximum value of the relative refractive index difference delta 4 between the inner cladding 4 and the outer cladding 5 is-0.60% to-0.72%, and the contribution delta F of fluorine in the inner cladding 4 is-0.60% to-0.72%.
The relative refractive index difference delta 2 of the matching cladding 2 is equal to the relative refractive index difference delta 4 of the inner cladding 4.
The diameter D1 of the core layer 1 is 6.0-10.0 mu m, the diameter D2 of the matched cladding layer 2 is 15.0-20.0 mu m, the diameter D3 of the depressed cladding layer 3 is 25.0-35.0 mu m, the diameter D4 of the inner cladding layer 4 is 80.0-100.0 mu m, and the diameter D5 of the outer cladding layer 5 is 125.0 mu m.
Referring to fig. 1 and 2, an annular air hole layer is formed in the inner cladding layer 4, and the annular air hole layer includes a plurality of air holes 6, and the number of the air holes is 5-12. Air holes distributed in a ring shape are introduced into the inner cladding, the refractive index of the optical fiber is reduced by the annular air holes, a double bending resistance structure is formed by the annular air holes and the sunken cladding, and the bending resistance of the optical fiber is greatly improved.
The diameter of a circle formed by the centers of the air holes 6 included in the annular air hole layer is 50-60 mu m, and the diameter of the air holes 6 is 5-10 mu m.
The method for manufacturing the irradiation-resistant single-mode optical fiber comprises the following steps:
in-tube doped deposition in pure quartz glass liner tube by plasma chemical vapor deposition method, wherein SiCl is a reaction gas 4 And introducing C into oxygen 2 F 6 Introducing fluorine doping; introducing BCl 3 Boron doping is introduced.
Changing the flow rate of the mixed gas, and sequentially depositing an inner cladding, a depressed cladding, a matched cladding and a core layer;
after the deposition is completed, the fiber preform is obtained by fusing and shrinking the fiber preform into a solid core rod through an electric induction furnace;
placing the optical fiber perform rod in a high-precision drilling lathe to drill holes according to a pre-fiber design, and finally placing the drilled optical fiber perform rod in a drawing tower to be drawn into an optical fiber, and coating an optical fiber coating layer on the surface of the optical fiber to protect the optical fiber;
SiCl when depositing the core layer 4 The steam flow rate is 600-800 sccm, C 2 F 6 The gas flow is 3-5 sccm;
SiCl when depositing matched cladding 4 The steam flow rate is 600-800 sccm, C 2 F 6 The gas flow is 8-12 sccm;
SiCl when depositing the dip cladding 4 Steam flow rate is 600-800 sccm, BCl 3 The steam flow is 100-200 sccm, C 2 F 6 The gas flow is 20-30 sccm;
SiCl when depositing inner cladding 4 The steam flow rate is 600-800 sccm, C 2 F 6 The gas flow is 8-12 sccm.
Embodiment one:
the irradiation-resistant single-mode optical fiber of the embodiment is formed by combining a core layer 1, a matched cladding layer 2, a depressed cladding layer 3, an inner cladding layer 4, an outer cladding layer 5 and an air hole 6. In the deposition and manufacturing process of the preform, the flow rates of SiCl4 vapor and C2F6 gas are controlled to be 600sccm and 3.5-3.0 sccm, and the exponent is changed to be 1.85. Matched cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 9sccm, depressed cladding deposition gas flow SiCl4 vapor 600sccm, BCl3 gas 120sccm, C2F6 gas 20sccm, inner cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 9sccm.
The geometry of the core diameter D1 is 6.5 μm, the matched cladding diameter D2 is 15 μm, the depressed cladding diameter D3 is 25 μm, the inner cladding diameter D4 is 80 μm, the outer cladding diameter D5 is 125 μm, the circle diameter formed by the central line of the air holes contained in the annular air hole layer is 50 μm, the air hole diameter is 5 μm, and a 12-hole mode is adopted. The refractive index control core layer has a relative refractive index difference Delta1 of-0.30%, the matched cladding layer has a relative refractive index difference Delta2 of-0.62%, the depressed cladding layer has a relative refractive index difference Delta3 of-1.01%, and the inner cladding layer has a relative refractive index difference Delta4 of-0.62%. The main parameters of the drawn irradiation-resistant single-mode fiber are shown in table 1.
TABLE 1
Embodiment two:
the irradiation-resistant single-mode optical fiber of the embodiment is formed by combining a core layer 1, a matched cladding layer 2, a depressed cladding layer 3, an inner cladding layer 4, an outer cladding layer 5 and an air hole 6. In the deposition and manufacturing process of the preform, the flow rate of SiCl4 vapor and the flow rate of C2F6 gas are controlled to be 600sccm and 3.8-3.2 sccm, respectively, and the exponent is changed to be 1.95. Matched cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 9.8sccm, depressed cladding deposition gas flow SiCl4 vapor 600sccm, BCl3 gas 140sccm, C2F6 gas 22sccm, inner cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 9.8sccm.
The geometry of the core diameter D1 was 7.2 μm, the matched cladding diameter D2 was 16 μm, the depressed cladding diameter D3 was 27 μm, the inner cladding diameter D4 was 84 μm, the outer cladding diameter D5 was 125 μm, the center line of the air holes contained in the annular air hole layer had a circular diameter of 52 μm, the air hole diameter was 6 μm, and a 10-hole pattern was employed. The refractive index control core layer has a relative refractive index difference Delta1 of-0.34%, the matched cladding layer has a relative refractive index difference Delta2 of-0.65%, the depressed cladding layer has a relative refractive index difference Delta3 of-1.05%, and the inner cladding layer has a relative refractive index difference Delta4 of-0.65%. The main parameters of the drawn irradiation-resistant single-mode fiber are shown in table 2.
TABLE 2
Embodiment III:
the irradiation-resistant single-mode optical fiber of the embodiment is formed by combining a core layer 1, a matched cladding layer 2, a depressed cladding layer 3, an inner cladding layer 4, an outer cladding layer 5 and an air hole 6. In the deposition and manufacturing process of the preform, the flow rates of SiCl4 vapor and C2F6 gas are controlled to be 600sccm and 4.0-3.4 sccm, respectively, and the exponent is 2.02. Matched cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 10.4sccm, depressed cladding deposition gas flow SiCl4 vapor 600sccm, BCl3 gas 160sccm, C2F6 gas 24sccm, inner cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 10.4sccm.
The geometry of the core diameter D1 was controlled to 8.0 μm, the matched cladding diameter D2 was 17 μm, the depressed cladding diameter D3 was 28.5 μm, the inner cladding diameter D4 was 86 μm, the outer cladding diameter D5 was 125 μm, the center line of the air holes contained in the annular air hole layer had a circular diameter of 54 μm, the air hole diameter was 7 μm, and a 7-hole pattern was employed. The refractive index control core layer has a relative refractive index difference Delta1 of-0.37%, the matched cladding layer has a relative refractive index difference Delta2 of-0.68%, the depressed cladding layer has a relative refractive index difference Delta3 of-1.10%, and the inner cladding layer has a relative refractive index difference Delta4 of-0.68%. The main parameters of the drawn irradiation-resistant single-mode optical fiber are shown in table 3.
TABLE 3 Table 3
Embodiment four:
the irradiation-resistant single-mode optical fiber of the embodiment is formed by combining a core layer 1, a matched cladding layer 2, a depressed cladding layer 3, an inner cladding layer 4, an outer cladding layer 5 and an air hole 6. In the deposition and manufacturing process of the preform, the flow rate of SiCl4 vapor and the flow rate of C2F6 gas are controlled to be 600sccm and 4.5-3.9 sccm, respectively, and the exponent is changed to be 2.05. Matched cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 11sccm, depressed cladding deposition gas flow SiCl4 vapor 600sccm, BCl3 gas 180sccm, C2F6 gas 26sccm, inner cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 11sccm.
The geometry of the core diameter D1 was controlled to 9.0 μm, the matched cladding diameter D2 was 18 μm, the depressed cladding diameter D3 was 30 μm, the inner cladding diameter D4 was 90 μm, the outer cladding diameter D5 was 125 μm, the circular diameter of the center line of the air holes contained in the annular air hole layer was 56 μm, the air hole diameter was 8 μm, and a 6-hole pattern was employed. The refractive index control core layer has a relative refractive index difference Delta1 of-0.41%, the matched cladding layer has a relative refractive index difference Delta2 of-0.70%, the depressed cladding layer has a relative refractive index difference Delta3 of-1.14%, and the inner cladding layer has a relative refractive index difference Delta4 of-0.70%. The main parameters of the drawn irradiation-resistant single-mode optical fiber are shown in table 4.
TABLE 4 Table 4
Fifth embodiment:
the irradiation-resistant single-mode optical fiber of the embodiment is formed by combining a core layer 1, a matched cladding layer 2, a depressed cladding layer 3, an inner cladding layer 4, an outer cladding layer 5 and an air hole 6. In the deposition and manufacturing process of the preform, the flow rates of SiCl4 vapor and C2F6 gas are controlled to be 600sccm and 5.0-4.3 sccm, and the exponent is changed to be 2.10. Matched cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 12sccm, depressed cladding deposition gas flow SiCl4 vapor 600sccm, BCl3 gas 200sccm, C2F6 gas 29sccm, inner cladding deposition gas flow SiCl4 vapor 600sccm, C2F6 gas 12sccm.
The geometry of the core diameter D1 was controlled to 10.0 μm, the matched cladding diameter D2 was 19 μm, the depressed cladding diameter D3 was 33 μm, the inner cladding diameter D4 was 98 μm, the outer cladding diameter D5 was 125 μm, the center line of the air holes contained in the annular air hole layer had a circular diameter of 58 μm, the air hole diameter was 9 μm, and a 5-hole mode was employed. The refractive index control core layer has a relative refractive index difference Delta1 of-0.43%, the matched cladding layer has a relative refractive index difference Delta2 of-0.72%, the depressed cladding layer has a relative refractive index difference Delta3 of-1.18%, and the inner cladding layer has a relative refractive index difference Delta4 of-0.72%. The main parameters of the drawn irradiation-resistant single-mode optical fiber are shown in table 5.
TABLE 5
In the description of the present application, it should be noted that the azimuth or positional relationship indicated by the terms "upper", "lower", etc. are based on the azimuth or positional relationship shown in the drawings, and are merely for convenience of description of the present application and simplification of the description, and are not indicative or implying that the apparatus or element in question must have a specific azimuth, be configured and operated in a specific azimuth, and thus should not be construed as limiting the present application. Unless specifically stated or limited otherwise, the terms "mounted," "connected," and "coupled" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the terms in this application will be understood by those of ordinary skill in the art as the case may be.
It should be noted that in this application, relational terms such as "first" and "second" and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
The foregoing is merely a specific embodiment of the application to enable one skilled in the art to understand or practice the application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The irradiation-resistant single-mode optical fiber is characterized by comprising a core layer (1), a matched cladding layer (2), a depressed cladding layer (3), an inner cladding layer (4) and an outer cladding layer (5) which are sequentially arranged from inside to outside;
the core layer (1) adopts fluorine doped gradient quartz glass;
the matched cladding (2) adopts fluorine-doped quartz glass;
the depressed cladding (3) adopts boron-fluorine co-doped quartz glass;
the inner cladding (4) adopts fluorine-doped quartz glass.
2. The radiation-resistant single-mode optical fiber of claim 1, wherein:
the absolute refractive index of the core layer (1) is distributed as a power exponent:
n 2 (r)＝n core center 2 [1-0.25(r/a) β ]；
Wherein n is Core center The absolute refractive index of the central position of the core layer (1), r is the distance between different positions of the core layer (1) and the central position of the core layer (1), a is the radius of the core layer (1), and beta is the power exponent.
3. The radiation-resistant single-mode optical fiber of claim 2, wherein:
the value of the exponent beta is 1.85 to 2.10.
4. The radiation-resistant single-mode optical fiber of claim 1, wherein:
the maximum value of the relative refractive index delta 1 of the core layer (1) and the outer cladding layer (5) is-0.45% to-0.28%.
5. The radiation-resistant single-mode optical fiber of claim 1, wherein:
the refractive indexes of the matched cladding (2), the depressed cladding (3) and the inner cladding (4) are distributed in a step-type manner;
the maximum value of the relative refractive index difference delta 2 between the matched cladding (2) and the outer cladding (5) is-0.60% -0.72%;
the maximum value of the relative refractive index difference delta 3 between the depressed cladding (3) and the outer cladding (5) is-1.0% -1.2%;
the maximum value of the relative refractive index delta 4 of the inner cladding (4) and the outer cladding (5) is-0.60% to-0.72%.
6. The radiation-resistant single-mode optical fiber of claim 5, wherein:
the relative refractive index difference delta 2 of the matching cladding (2) is equal to the relative refractive index difference delta 4 of the inner cladding (4).
7. The radiation-resistant single-mode optical fiber of claim 5, wherein:
in the depressed cladding (3), the contribution amount DeltaB of boron to the relative refractive index difference Delta3 is-0.30% to-0.45%, and the contribution amount DeltaF of fluorine to the relative refractive index difference Delta3 is-0.70% to-0.75%.
8. The radiation-resistant single-mode optical fiber of claim 1, wherein:
the diameter D1 of the core layer (1) is 6.0-10.0 mu m, the diameter D2 of the matched cladding layer (2) is 15.0-20.0 mu m, the diameter D3 of the depressed cladding layer (3) is 25.0-35.0 mu m, the diameter D4 of the inner cladding layer (4) is 80.0-100.0 mu m, and the diameter D5 of the outer cladding layer (5) is 125.0 mu m.
9. The radiation-resistant single-mode optical fiber of claim 1, wherein:
an annular air hole layer is formed in the inner cladding layer (4), and the annular air hole layer comprises a plurality of air holes (6).
10. The radiation-resistant single-mode optical fiber of claim 9, wherein:
the diameter of a circle formed by the centers of air holes (6) contained in the annular air hole layer is 50-60 mu m, and the diameter of the air holes (6) is 5-10 mu m.
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