CN117023972A - Quartz type low-crosstalk image transmission optical fiber and preparation method thereof - Google Patents

Quartz type low-crosstalk image transmission optical fiber and preparation method thereof Download PDF

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Publication number
CN117023972A
CN117023972A CN202310847876.9A CN202310847876A CN117023972A CN 117023972 A CN117023972 A CN 117023972A CN 202310847876 A CN202310847876 A CN 202310847876A CN 117023972 A CN117023972 A CN 117023972A
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image transmission
optical fiber
transmission optical
core
type low
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杨念
李鹏
吴威
王瑞春
张磊
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Yangtze Optical Fibre and Cable Co Ltd
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Yangtze Optical Fibre and Cable Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/02—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor
    • C03B37/025—Manufacture of glass fibres or filaments by drawing or extruding, e.g. direct drawing of molten glass from nozzles; Cooling fins therefor from reheated softened tubes, rods, fibres or filaments, e.g. drawing fibres from preforms
    • C03B37/027—Fibres composed of different sorts of glass, e.g. glass optical fibres
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/01205—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments
    • C03B37/01211—Manufacture of preforms for drawing fibres or filaments starting from tubes, rods, fibres or filaments by inserting one or more rods or tubes into a tube
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B37/00—Manufacture or treatment of flakes, fibres, or filaments from softened glass, minerals, or slags
    • C03B37/01—Manufacture of glass fibres or filaments
    • C03B37/012—Manufacture of preforms for drawing fibres or filaments
    • C03B37/014—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD]
    • C03B37/018—Manufacture of preforms for drawing fibres or filaments made entirely or partially by chemical means, e.g. vapour phase deposition of bulk porous glass either by outside vapour deposition [OVD], or by outside vapour phase oxidation [OVPO] or by vapour axial deposition [VAD] by glass deposition on a glass substrate, e.g. by inside-, modified-, plasma-, or plasma modified- chemical vapour deposition [ICVD, MCVD, PCVD, PMCVD], i.e. by thin layer coating on the inside or outside of a glass tube or on a glass rod
    • C03B37/01807—Reactant delivery systems, e.g. reactant deposition burners
    • C03B37/01815—Reactant deposition burners or deposition heating means
    • 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

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Manufacturing & Machinery (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Organic Chemistry (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Manufacture, Treatment Of Glass Fibers (AREA)

Abstract

The invention belongs to the technical field of optical fibers, and discloses a quartz type low-crosstalk image transmission optical fiber and a preparation method thereof. Firstly, corroding a pure silicon dioxide layer of a first high NA core rod, and placing the corroded core rod into a fluorine-doped glass sleeve to be fused and contracted to obtain a second high NA core rod, wherein the numerical aperture of the core rod is 0.40-0.45; then drawing the second high NA core rod to obtain a single-core capillary rod; stacking a plurality of single-core capillary rods in a first pure silicon dioxide outer sleeve to obtain a multifilament preform, and drawing the multifilament preform to obtain a multifilament capillary rod; partially corroding the pure silicon dioxide cladding of the multifilament capillary rod to obtain a corroded multifilament capillary rod; and finally, stacking a plurality of corroded multifilament capillary rods in a second pure silicon dioxide outer sleeve to obtain an image transmission optical fiber preform, and drawing the image transmission optical fiber preform to obtain the quartz type low-crosstalk image transmission optical fiber. The invention can improve NA value of core rod and image transmission fiber and reduce crosstalk between fiber cores.

Description

Quartz type low-crosstalk image transmission optical fiber and preparation method thereof
Technical Field
The invention belongs to the technical field of optical fibers, and particularly relates to a quartz type low-crosstalk image transmission optical fiber and a preparation method thereof.
Background
The image transmission optical fiber, also called imaging optical fiber, multi-core image transmission beam or optical fiber image transmission beam, is a passive optical fiber image transmission device. The passive optical fiber image transmission device mainly comprises two types, namely a rigid optical fiber panel; one is an optical fiber image transmission bundle with flexibility, and also comprises a pure silica multi-core image transmission optical fiber with semi-flexibility. The pure silica type image transmission optical fiber has the advantages of small volume, light weight, high temperature resistance, electromagnetic interference resistance, certain flexibility and flexible image transmission process, and is widely applied to the fields of endoscopes and the like. The index for representing the performance of the image transmission optical fiber is particularly important to three items, namely numerical aperture, transmittance and resolution. The numerical aperture of the image transmission optical fiber is consistent with the numerical aperture of the optical fiber monofilament, and the size of the image transmission optical fiber indicates the intensity of the light collecting capacity of the image transmission optical fiber; the transmittance is an important mark for representing the light transmittance of the image transmission optical fiber, and the light transmittance is good when the transmittance is high; resolution is a parameter representing the quality of an image transmitted by an image transmission optical fiber, and refers to the minimum distance between two point images in a space, which can be resolved by the image transmission optical fiber, and is usually expressed by the log (lp/mm) of line distance which can be resolved in each millimeter, and the higher the resolution, the better the transmission quality and the higher the definition. In addition, the crosstalk rate of the optical fiber is one of the influencing factors influencing the image transmission quality of the image transmission optical fiber, and how to optimize the crosstalk between optical fiber cores has been attracting attention of many researchers.
The traditional image transmission optical fiber is a bundle type optical fiber image transmission bundle made of multi-component glass materials, and thousands or tens of thousands of multi-component glass monofilaments with certain length and diameter are glued and positioned at two ends, so that optical fiber pixels which are arranged in a related manner are positioned relatively, and the optical fiber bundle with most of the length in the middle is in a free and loose state so as to have flexibility, and the prepared image transmission optical fiber has certain defects of gluing boundary, complex process, high manufacturing difficulty, high cost, high absorption loss and the like. The quartz type image transmission optical fiber is formed by arranging thousands of quartz optical fibers in a pure silicon dioxide sleeve pipe in order, heating and fusing the quartz optical fibers into a whole, and the prepared image transmission optical fiber has the advantages of high resolution, longer drawing length, low cost and the like. Compared with the multicomponent glass image transmission optical fiber bundle, the quartz type image transmission optical fiber has the following advantages: 1) The ultra-fine diameter image transmission optical fiber can be prepared, and is more suitable for medical endoscopes, in particular to the parts of the pancreatic bile duct, the bronchus and the like; 2) The optical transmission performance is excellent, and the image quality is higher; 3) Higher resolution; 4) Long-distance optical transmission can be realized; 5) The chemical stability and the mechanical durability are high; 6) Has wider application prospect in the fields of medical treatment, industry, national defense and military industry and the like.
However, the conventional pure silica doping system has an upper limit on how to prepare a high Numerical Aperture (NA) core rod, which is difficult to reach or exceed 0.4, and how to further break through the upper limit to reach a higher numerical aperture becomes a major technical problem.
Disclosure of Invention
The invention provides a quartz type low-crosstalk image transmission optical fiber and a preparation method thereof, which solve the problems that the upper limit of NA value of the image transmission optical fiber is difficult to break through and the inter-core crosstalk is required to be further reduced in the prior art.
In a first aspect, the present invention provides a method for preparing a quartz-type low-crosstalk image transmission optical fiber, including the following steps:
step 1, corroding a pure silicon dioxide layer of a first high NA core rod, and placing the corroded core rod into a fluorine-doped glass sleeve for shrinking to obtain a second high NA core rod;
the first high NA core rod is prepared by adopting a PCVD process, and comprises a pure silicon dioxide germanium-doped core layer, a pure silicon dioxide fluorine-doped sunken layer and the pure silicon dioxide layer which are used as a cladding layer from inside to outside in sequence, wherein the numerical aperture of the first high NA core rod ranges from 0.20 to 0.35; the second high NA core rod sequentially comprises a pure silicon dioxide germanium-doped core layer, a pure silicon dioxide fluorine-doped sunken layer and the fluorine-doped glass sleeve which is used as a cladding layer from inside to outside, and the numerical aperture of the second high NA core rod ranges from 0.40 to 0.45;
step 2, drawing the second high NA mandrel to obtain a single-core capillary rod;
step 3, stacking a plurality of single-core capillary rods in a first pure silicon dioxide outer sleeve to obtain a multifilament preform; drawing the multifilament preform to obtain a multifilament capillary rod;
step 4, partially corroding the pure silicon dioxide cladding of the multifilament capillary rod to obtain a corroded multifilament capillary rod;
step 5, stacking a plurality of corroded multifilament capillary rods in a second pure silicon dioxide outer sleeve to obtain an image transmission optical fiber preform; and drawing the image transmission optical fiber preform to obtain the quartz type low-crosstalk image transmission optical fiber.
Preferably, in the step 1, the pure silica germanium doped core layer in the second high NA mandrel has a positive relative refractive index, and the positive relative refractive index difference ranges from +0.5% to +3.5%; the fluorine-doped glass sleeve in the second high NA core rod has a negative relative refractive index, with a negative relative refractive index difference in the range of-2.0% to-0.2%.
Preferably, in the step 2, the diameter of the single-core capillary rod is 1.2 mm-2.6 mm, and the length is 800 mm-1200 mm; in the step 3, the value range of the diameter of the obtained multifilament capillary rod is 1.5 mm-3.5 mm, and the value range of the length is 700 mm-1000 mm; in the step 4, the thickness of the pure silicon dioxide cladding of the etched multifilament capillary rod is 20-200 um.
Preferably, in the step 3, the value range of the inside-outside diameter ratio of the first pure silica outer sleeve is 0.30-0.85; in the step 5, the value range of the inside-outside diameter ratio of the second pure silicon dioxide outer sleeve is 0.30-0.85.
Preferably, in the step 5, the ratio of the diameter of the single fiber core to the core pitch in the obtained quartz-type low-crosstalk image transmission optical fiber is in a range of 0.45-0.85.
Preferably, in the step 5, the ratio of the image plane diameter to the cladding diameter of the obtained quartz-type low-crosstalk image transmission fiber is in a range of 0.50 to 0.95.
Preferably, in the step 5, the resolution of the obtained quartz-type low-crosstalk image transmission optical fiber is in a range of 100lp/mm to 250lp/mm.
Preferably, in the step 5, the transmittance of the obtained quartz-type low-crosstalk image transmission fiber is greater than 50%/m.
Preferably, the quartz-type low-crosstalk image transmission optical fiber further comprises a coating layer, and the thickness of the coating layer is 20-200 um.
In a second aspect, the present invention provides a quartz-type low-crosstalk image transmission optical fiber, which is prepared by using the preparation method of the quartz-type low-crosstalk image transmission optical fiber.
One or more technical schemes provided by the invention have at least the following technical effects or advantages:
according to the invention, the core rod preform (namely the second high NA core rod) is of a core layer-sunken layer-cladding structure, the core layer is of pure silicon dioxide germanium doping to realize high refractive index, the sunken layer is of pure silicon dioxide fluorine doping, the cladding adopts fluorine doping glass sleeve to realize cladding with lower refractive index, the core rod has higher NA through the design, the upper limit of NA value of the core rod prepared by a traditional pure silicon dioxide doping system can be broken through, and the mutual coupling between fiber cores can be effectively inhibited by the higher NA value, so that the cross talk between fiber cores can be reduced, and a clearer transmission image can be obtained. In addition, the core rod prefabricated rod is prepared by combining PCVD (plasma chemical vapor deposition) technology and pipe inner core rod shrinking technology, firstly, a conventional high NA core rod is prepared by PCVD, the core layer of the core rod is high in germanium doping content, the sunken layer is doped with fluorine so as to prevent core layer light from leaking out, and therefore inter-core crosstalk is reduced, then, the pure silicon dioxide layer of the prefabricated rod is removed by a corrosion mode, and then, the prefabricated rod is combined with a fluorine doped glass sleeve pipe to be assembled, and then, the prefabricated rod is obtained by shrinking and melting the pipe inner core rod. Compared with the situation that doping elements cannot be doped and cannot reach a pre-designed state when the doping amount is large due to the adoption of the FCVD (flame vapor deposition) method, the method can ensure that the doping elements are doped effectively and reach the preset requirement by utilizing the PCVD technology. The invention can avoid the situation of core rod explosion caused by mechanical external force when preparing the prefabricated rod by adopting a mechanical processing mode in the existing preparation method by adopting a corrosion mode, and can effectively improve the yield.
Drawings
FIG. 1 is a flow chart of a preparation of a quartz-type low-crosstalk image transmission optical fiber according to an embodiment of the present invention;
FIG. 2 is a schematic view of a refractive index profile of a second high NA core rod;
FIG. 3 is an end view schematic of a multifilament preform;
FIG. 4 is a schematic end view of a etched multifilament capillary rod;
fig. 5 is an end view schematically showing an image-transmitting optical fiber preform.
Detailed Description
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
The embodiment provides a preparation method of a quartz type low-crosstalk image transmission optical fiber, referring to fig. 1, comprising the following steps:
and 1, melting and shrinking the core rod in the pipe.
And corroding the pure silicon dioxide layer of the first high NA core rod, and placing the corroded core rod into a fluorine-doped glass sleeve to be melted and contracted to obtain a second high NA core rod.
Specifically, the first high NA core rod is a core rod prepared by adopting a PCVD process, the first high NA core rod sequentially comprises a pure silicon dioxide germanium-doped core layer, a pure silicon dioxide fluorine-doped sunken layer and the pure silicon dioxide layer serving as a cladding layer from inside to outside, and the numerical aperture of the first high NA core rod ranges from 0.20 to 0.35. Referring to fig. 2, the second high NA mandrel sequentially comprises, from inside to outside, a pure silica germanium-doped core layer (a in fig. 2 is a core radius), a pure silica fluorine-doped depressed layer (b in fig. 2 is a depressed layer radius), and the fluorine-doped glass sleeve as a cladding layer (c in fig. 2 is a cladding radius), i.e. the mandrel structure is coaxial with the core layer-depressed layer-cladding layer three layers; the numerical aperture of the second high NA core rod ranges from 0.40 to 0.45.
The pure silicon dioxide germanium-doped core layer in the second high NA core rod has a positive relative refractive index, and the positive relative refractive index difference is in the range of +0.5% to +3.5%; the fluorine-doped glass sleeve in the second high NA core rod has a negative relative refractive index, with a negative relative refractive index difference in the range of-2.0% to-0.2%. The larger refractive index difference between the core layer and the cladding layer enables the numerical aperture of the second high NA core rod to reach more than 0.40.
For example, the core layer forms a positive relative refractive index difference of +2.52% by doping germanium, the depressed layer reduces the refractive index by doping fluorine, the cladding layer forms a negative relative refractive index difference of-1.27% for the fluorine doped glass sleeve, and the larger refractive index difference between the core layer and the cladding layer brings the NA value to 0.407.
The relative refractive index of the sunken layer ranges from-2.2% to-0.4%, and the sunken layer is used for preventing light leakage of the core layer and reducing inter-core crosstalk. The ratio of the core layer to the cladding layer, i.e., core-to-cladding ratio (a/c), ranges from 0.45 to 0.85, and the ratio of the depressed layer to the core layer ranges from 0.05 to 0.50.
In the step 1 of the invention, the conventional high numerical aperture core rod prepared by PCVD technology is corroded to remove an external pure silicon dioxide layer, the corrosion degree is accurately controlled, then the corroded core rod is placed in a fluorine-doped glass sleeve, and the core rod preform with high NA (NA is more than or equal to 0.40 and less than or equal to 0.45) is prepared by the in-pipe core rod fusion shrinkage technology.
And 2, preparing the single-core capillary rod.
And drawing the second high NA mandrel to obtain the single-core capillary rod.
Specifically, the mandrel preform is prepared into a single-core capillary rod with the same diameter and equal length, and the numerical aperture is more than or equal to 0.40; the diameter of the single-core capillary rod is 1.2-2.6 mm, and the length is 800-1200 mm.
For example, the second high NA core is drawn on a drawing tower into a single-core capillary rod with a diameter of 2.5mm and a length of 1200mm, and washed and dried.
And 3, preparing a multifilament prefabricated rod and a multifilament capillary rod.
Referring to fig. 3, a plurality of single-core capillary rods 1 are stacked in a first pure silica outer sleeve 2 to obtain a multifilament preform; and drawing the multifilament preform to obtain the multifilament capillary rod.
Specifically, the single-core capillary rods are randomly arranged in a certain number in a pure silicon dioxide outer sleeve with a certain inner diameter and fixed in the sleeve to prepare a multifilament prefabricated rod, wherein the value range of the inner diameter to the outer diameter ratio of the pure silicon dioxide outer sleeve is 0.30-0.85; the stacking process horizontally places a pure silicon dioxide outer sleeve, and the single-core capillary rods naturally form close stacking under the action of gravity.
The multifilament preformed rod is prepared into multifilament capillary rods with the same diameter and the same length, the diameter of the multifilament capillary rod ranges from 1.5mm to 3.5mm, and the length ranges from 700mm to 1000mm.
For example, the washed and dried single-core capillary rods are stacked in a pure silica outer sleeve with an inner diameter of 29mm and a wall thickness of 8mm until the whole inner diameter of the outer sleeve is filled, and the number of the filled single-core capillary rods is about 100-110. The outer sleeve is horizontally placed during filling, the single-core capillary rods are naturally and closely piled under the action of gravity, the single-core capillary rods are fixed in the outer sleeve and do not slide relatively, and finally the fixed multifilament preform is obtained. The multifilament preform was then drawn on a draw tower to a multifilament capillary rod of diameter 2.9mm and length 1000mm.
And 4, corroding the multifilament capillary rod.
The pure silica cladding of the multifilament capillary rod was partially etched to give an etched multifilament capillary rod 3, see fig. 4.
Specifically, the pure silicon dioxide cladding of the multifilament capillary rod is corroded by a corrosion method, the corrosion degree is precisely controlled to be a proper thickness, and the range of the thickness is 20-200 um.
For example, the multifilament capillary rod is etched to remove part of the pure silica cladding, the diameter of the etched multifilament capillary rod is 1.90-1.95 mm, and then the etched multifilament capillary rod is washed and dried.
And 5, preparing an image transmission optical fiber preform and an image transmission optical fiber.
Referring to fig. 5, stacking a plurality of corroded multifilament capillary rods 3 in a second pure silica outer sleeve 4 to obtain an image transmission optical fiber preform; and drawing the image transmission optical fiber preform to obtain the quartz type low-crosstalk image transmission optical fiber.
Specifically, the corroded multifilament capillary rods are randomly arranged in a certain number in a pure silicon dioxide outer sleeve with a certain inner diameter and fixed in the sleeve to prepare the image transmission optical fiber preform, wherein the value range of the inner diameter and the outer diameter ratio of the pure silicon dioxide outer sleeve is 0.30-0.85.
The image transmission optical fiber preform is drawn to obtain an image transmission optical fiber, the value range of the ratio of the diameter of a single fiber core to the core spacing in the obtained quartz type low-crosstalk image transmission optical fiber is 0.45-0.85, the value range of the ratio of the diameter of an image transmission surface to the diameter of a cladding is 0.50-0.95, the resolution range is 100 lp/mm-250 lp/mm, and the transmittance is more than 50%/m.
The image transmission surface in the optical fiber consists of individual fiber cores, the number of the fiber cores is different from ten thousands to hundreds of thousands, and the number of the fiber cores of the quartz type image transmission optical fiber can be regulated and controlled by the number of the capillary rods stacked each time.
In addition, the quartz-type low-crosstalk image transmission optical fiber also comprises a coating layer, wherein the thickness of the coating layer is 20-200 um.
For example, the washed and dried etched multifilament capillary rods are stacked in a pure silica outer jacket tube having an inner diameter of 21.5mm and a wall thickness of 4.75mm until the whole outer jacket tube is filled, and the number of the filled single-core capillary rods is about 100 to 110. The outer sleeve is horizontally placed during filling, corroded multifilament capillary rods are naturally and closely piled under the action of gravity, the corroded multifilament capillary rods are fixed in the outer sleeve and do not slide relatively, and finally the fixed image transmission optical fiber preform is obtained. And drawing the image transmission optical fiber preform on a drawing tower to form the quartz type low-crosstalk image transmission optical fiber, wherein the number of fiber cores is about 1 ten thousand cores, and the outer diameter is about 650um.
In summary, the invention adopts the high numerical aperture core rod to prepare the single fiber core of the image transmission optical fiber, and the cladding of the image transmission optical fiber is pure silicon dioxide. The fiber core preform consists of a germanium-doped core layer, a fluorine-doped subsidence layer and a fluorine-doped glass sleeve, and the single-core capillary rods are randomly arranged and stacked in a pure silicon dioxide outer sleeve to prepare multifilament capillary rods; the corroded multifilament capillary rod is randomly arranged and stacked on a pure silicon dioxide outer sleeve again, and is drawn into an imaging optical fiber. The invention can improve NA value of the core rod and the image transmission optical fiber, reduce crosstalk between fiber cores, better improve image transmission resolution of the end face of the optical fiber, improve image transmission quality, and has important significance for development of fields such as biomedical endoscopes and the like.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same, and although the present invention has been described in detail with reference to examples, it should be understood by those skilled in the art that modifications and equivalents may be made to the technical solution of the present invention without departing from the spirit and scope of the technical solution of the present invention, and all such modifications and equivalents are intended to be encompassed in the scope of the claims of the present invention.

Claims (10)

1. The preparation method of the quartz type low-crosstalk image transmission optical fiber is characterized by comprising the following steps of:
step 1, corroding a pure silicon dioxide layer of a first high NA core rod, and placing the corroded core rod into a fluorine-doped glass sleeve for shrinking to obtain a second high NA core rod;
the first high NA core rod is prepared by adopting a PCVD process, and comprises a pure silicon dioxide germanium-doped core layer, a pure silicon dioxide fluorine-doped sunken layer and the pure silicon dioxide layer which are used as a cladding layer from inside to outside in sequence, wherein the numerical aperture of the first high NA core rod ranges from 0.20 to 0.35; the second high NA core rod sequentially comprises a pure silicon dioxide germanium-doped core layer, a pure silicon dioxide fluorine-doped sunken layer and the fluorine-doped glass sleeve which is used as a cladding layer from inside to outside, and the numerical aperture of the second high NA core rod ranges from 0.40 to 0.45;
step 2, drawing the second high NA mandrel to obtain a single-core capillary rod;
step 3, stacking a plurality of single-core capillary rods in a first pure silicon dioxide outer sleeve to obtain a multifilament preform; drawing the multifilament preform to obtain a multifilament capillary rod;
step 4, partially corroding the pure silicon dioxide cladding of the multifilament capillary rod to obtain a corroded multifilament capillary rod;
step 5, stacking a plurality of corroded multifilament capillary rods in a second pure silicon dioxide outer sleeve to obtain an image transmission optical fiber preform; and drawing the image transmission optical fiber preform to obtain the quartz type low-crosstalk image transmission optical fiber.
2. The method for preparing a silica-type low crosstalk image transmission optical fiber according to claim 1, wherein in the step 1, the pure silica germanium doped core layer in the second high NA core rod has a positive relative refractive index, and the positive relative refractive index difference ranges from +0.5% to +3.5%; the fluorine-doped glass sleeve in the second high NA core rod has a negative relative refractive index, with a negative relative refractive index difference in the range of-2.0% to-0.2%.
3. The method for preparing a quartz-type low-crosstalk image transmission optical fiber according to claim 1, wherein in the step 2, the diameter of the obtained single-core capillary rod is 1.2 mm-2.6 mm, and the length is 800 mm-1200 mm; in the step 3, the value range of the diameter of the obtained multifilament capillary rod is 1.5 mm-3.5 mm, and the value range of the length is 700 mm-1000 mm; in the step 4, the thickness of the pure silicon dioxide cladding of the etched multifilament capillary rod is 20-200 um.
4. The method for preparing a quartz-type low-crosstalk image transmission optical fiber according to claim 1, wherein in the step 3, the value range of the inner-outer diameter ratio of the first pure silica outer sleeve is 0.30-0.85; in the step 5, the value range of the inside-outside diameter ratio of the second pure silicon dioxide outer sleeve is 0.30-0.85.
5. The method for preparing a silica type low crosstalk image transmission optical fiber according to claim 1, wherein in the step 5, the ratio of the diameter of a single fiber core to the core pitch of the obtained silica type low crosstalk image transmission optical fiber is in the range of 0.45-0.85.
6. The method for manufacturing a silica-type low crosstalk image transmission optical fiber according to claim 1, wherein the ratio of the image transmission surface diameter to the cladding diameter of the silica-type low crosstalk image transmission optical fiber obtained in the step 5 is in the range of 0.50 to 0.95.
7. The method for preparing a silica-type low crosstalk image transmission optical fiber according to claim 1, wherein in the step 5, the resolution of the silica-type low crosstalk image transmission optical fiber is in the range of 100lp/mm to 250lp/mm.
8. The method according to claim 1, wherein the transmittance of the quartz-type low-crosstalk image transmission fiber obtained in the step 5 is greater than 50%/m.
9. The method for manufacturing a quartz-type low-crosstalk image transmission optical fiber according to claim 1, wherein the quartz-type low-crosstalk image transmission optical fiber further comprises a coating layer, and the thickness of the coating layer is 20 um-200 um.
10. A quartz-type low-crosstalk image transmission optical fiber, which is characterized by being prepared by adopting the preparation method of the quartz-type low-crosstalk image transmission optical fiber according to any one of claims 1-9.
CN202310847876.9A 2023-07-11 2023-07-11 Quartz type low-crosstalk image transmission optical fiber and preparation method thereof Pending CN117023972A (en)

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CN202310847876.9A CN117023972A (en) 2023-07-11 2023-07-11 Quartz type low-crosstalk image transmission optical fiber and preparation method thereof

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CN202310847876.9A CN117023972A (en) 2023-07-11 2023-07-11 Quartz type low-crosstalk image transmission optical fiber and preparation method thereof

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