CN1217874C - Prefabricated fiber rod with several clad layers and its fabrication - Google Patents

Prefabricated fiber rod with several clad layers and its fabrication Download PDF

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Publication number
CN1217874C
CN1217874C CN02138975.6A CN02138975A CN1217874C CN 1217874 C CN1217874 C CN 1217874C CN 02138975 A CN02138975 A CN 02138975A CN 1217874 C CN1217874 C CN 1217874C
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outside diameter
high purity
ratio
surrounding layer
purity
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CN1398804A (en
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何珍宝
童维军
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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
    • C03B37/012—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]
    • C03B37/01413—Reactant delivery systems
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03B—MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES
    • C03B2203/00—Fibre product details, e.g. structure, shape
    • C03B2203/10—Internal structure or shape details
    • C03B2203/22—Radial profile of refractive index, composition or softening point
    • C03B2203/23—Double or multiple optical cladding profiles

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

Abstract

The present invention relates to an optical fiber prefabricated rod with a plurality of coating layers and a manufacturing method thereof. The optical fiber prefabricated rod comprises a core rod and an outer coating layer, wherein the core rod is composed of a core layer, an inner coating layer and a lower oxhydryl coating layer with high purity in sequence; the outer coating layer is divided into an outer coating layer with high purity and an outer coating layer with secondary high purity. The present invention solves the problems that in the existing optical fiber manufacturing technology, the specific weight of a high purity raw material used by the outer coating layer is overlarge, which causes low utilization rate of the high purity raw material and high manufacturing cost. The manufacturing method of the present invention comprises the following steps in sequence that: 1. the core rod is prepared; 2. highly purified SiCl4 with the content of 99.99% to 99.999% is used as the raw material on the outer surface of the core rod, the pipe outside deposition technology is used for manufacturing the outer coating layer with high purity, and the prefabricated rod is manufactured; 3. the SiCl4 with the content of 99.99% to 99.999% is used as the raw material on the outer surface of the prefabricated rod, the pipe outside deposition technology is used for manufacturing the outer coating layer with the secondary high purity, and the optical fiber prefabricated rod with a plurality of coating layers is manufactured. The present invention reduces the cost of the raw material, also improves the performance of an optical fiber, and improves the manufacturing efficiency and the capability of an optical fiber core rod device.

Description

Multi-clad prefabricated rods and manufacture method
Technical field
The present invention relates to optical fiber and make a kind of preform in field and manufacture method, specifically a kind of multi-clad prefabricated rods and manufacture method of forming by the slightly variant quartzy material of multilayer purity of can be used for drawing silica fibre.
Technical background
Present manufacturers in the world is mainly chemical vapor deposition method with the method for prefabricated quartz fiber rod; Wherein, typical method of manufacturing technology is just like the OVD that introduces among the United States Patent (USP) U.S.Pat.3932162 (outsidevapor-phase deposition) technology and VAD (vapor-phase axial deposition) technology, the PCVD that is narrated in the Chinese patent 98813827.1 (plasma active chemical vapor-phasedeposition) technology and the methods such as MCVD (modifiedchemical vapor-phase deposition) technology as introducing among the United States Patent (USP) U.S.Pat.4217027.Along with the continuous research and development of optic fibre manufacturing technology, various optic fibre manufacturing technologies merge mutually, have also occurred the manufacture method of four kinds of technology phase blended preforms in recent years.The preform that adopts above various technologies to make, according to employed material purity in the manufacturing processed and the height of making the foreign matter content of the formed silica glass in back optical fiber or prefabricated rods can be divided into following which floor: the sandwich layer with optical fiber of high index, and adjacent with the sandwich layer of optical fiber, have the inner cladding of optical fiber that will be low than the sandwich layer specific refractory power; Adjacent with inner cladding, the bushing pipe layer of optical fiber and the surrounding layer that reaches optical fiber.Concerning optical fiber was made the field, currently available products was relative with manufacture method ripe, and its subject matter that faces is how to reduce the manufacturing cost of optical fiber effectively.The now general manufacturing cost method that reduces optical fiber is to reduce the manufacturing cost of fibre-optical mandrel, thereby promptly direct production goes out big plug and improves raw-material utilization ratio and efficiency of equipment to reduce manufacturing cost.
By the optical field distribution of optical fiber as can be known, light almost concentrates in the inner cladding of the sandwich layer of optical fiber and optical fiber.Thereby very high to the purity requirement of the inner cladding of the sandwich layer of optical fiber and optical fiber, its technique manufacturing method that adopts is also different with rest part.To this part, we will adopt the manufacturing process of plug to finish usually.The bushing pipe layer is the interface of the outside surface and the surrounding layer of plug, usually very easily contaminated because of the outside surface of plug, so its foreign matter content height, the sandwich layer and the inner cladding of very close optical fiber, in the process of heating, impurity enters inner cladding and sandwich layer easily by thermodiffusion, thereby influences the purity of sandwich layer and inner cladding and can cause the decay of optical fiber to increase; For single-mode fiber, the part that the manufacturing process of dependence plug is finished accounts for fiber optic hub part representative value and is approximately 20 microns, and the ratio of its shared whole optical fiber only is 2.56%.The part that accounts for optical fiber 97.64% all is to adopt the manufacturing process of non-plug to finish.For method technology in the pipe, the bushing pipe layer, inner cladding accounts for about 30 microns of fiber optic hub part altogether with sandwich layer, and the ratio of its shared whole optical fiber only is 5.76%.The part that accounts for optical fiber 94.24% is the surrounding layer of optical fiber.
From above analysis as can be known, want to reduce effectively the manufacturing cost of optical fiber, except will reducing the manufacturing cost of fibre-optical mandrel, key is to reduce the manufacturing cost of the covering of optical fiber, promptly will reduce the cost of the part that the manufacturing process of non-plug finishes.The manufacturing cost of optical fiber is mainly derived from the manufacturing cost of covering, especially the manufacturing cost of surrounding layer.The typical manufacture method of the surrounding layer of optical fiber has direct pipe external sediment method, tiretube process and sol-gel method.Though sol-gel method is up-and-coming method, at present that is that all right is ripe for technology, is difficult to form scale and benefit.Directly manage the external sediment method, the tiretube process great majority all are to adopt OVD technology, and because of the main raw material(s) that this technology is used, the utilization ratio of highly purified SiCl4 is 20-30% only, and raw-material utilization ratio is low.For content is 99.99% to 99.999% highly purified SiCl 4, its price is very expensive.And high more its price of purity is also expensive more.For example purity reaches the SiCl of 99.999% magnitude 4With purity be the SiCl of 99.9% magnitude 4Price differ several times because raw-material utilization ratio is low, when adopting OVD technology to make surrounding layer like this, it is very most of that its material cost has occupied whole cost.In order to reduce the manufacturing cost of surrounding layer effectively, key is to reduce the raw-material cost of surrounding layer.But if surrounding layer uses the SiCl than low-purity fully 4, because of its foreign matter content height, in the process of heating, impurity enters inner cladding and sandwich layer easily by thermodiffusion, thereby influences the purity of sandwich layer and inner cladding and can cause the decay increase of optical fiber; If have one or more layers thicker pure quartz glass near core segment in the surrounding layer, in the manufacturing processed of optical fiber, impurity is difficult to enter inner cladding and sandwich layer by thermodiffusion in the inferior pure quartz glass layer beyond the pure quartz glass.So just, the inferior pure quartz glass that available cheap starting material are made, part replaces the outermost silica glass of surrounding layer in the existing preform.
Summary of the invention
Purpose of the present invention just provides a kind of multi-clad prefabricated rods and manufacture method, it has solved in the existing optic fibre manufacturing technology, the employed high pure raw materials proportion of the surrounding layer of preform is excessive, thus cause high pure raw materials account for the manufacturing cost proportion of optical fiber too high, make the high problem of manufacturing cost of optical fiber.
The present invention utilizes the guide properties of optical fiber and the characteristic of thermodiffusion, the covering of preform is divided into several layers, the purity requirement of each layer is not quite similar, purity the closer to fibre core is high more, the starting material that use are also expensive more, purity the closer to outside surface is low more, the starting material that use are also cheap more, because the closer to outside surface, cross section shared in the unit thickness is big more, use raw-material proportion also big more, do not cause the increase of optical fiber attenuation so can reduce the manufacturing cost of optical fiber comparatively significantly.
The manufacturing of preform of the present invention mainly comprises following step, the preparation process of silica fibre plug, the preparation process of the preparation process of pure quartz glass covering and time pure quartz glass covering.Wherein, the preparation process of silica fibre plug, the preparation process of pure quartz glass covering is the same with the manufacturing process of existing preform, and only the core bag of prefabricated rods is than A/D difference.
Preform involved in the present invention comprises plug and surrounding layer, and plug is made of successively sandwich layer, inner cladding, the low high-purity covering of hydroxyl, and surrounding layer is divided into high purity surrounding layer and time high purity surrounding layer, and the size of each layer is as follows:
Inner cladding outside diameter B is 1.0-4.0 with the ratio of sandwich layer outside diameter A;
The low high-purity covering outside diameter of hydroxyl C is 2.0-5.0 with the ratio of sandwich layer outside diameter A;
High purity surrounding layer outside diameter D is 5.0-13.0 with the ratio of sandwich layer outside diameter A;
Inferior high purity surrounding layer outside diameter E is 13.5-15.2 with the ratio of sandwich layer outside diameter A;
The gravel size decision of each layer is as follows among the present invention:
Inner cladding outside diameter B is 2.0-3.0 with the ratio of sandwich layer outside diameter A;
The low high-purity covering outside diameter of hydroxyl C is 3.0-4.0 with the ratio of sandwich layer outside diameter A;
High purity surrounding layer outside diameter D is 8.0-11.5 with the ratio of sandwich layer outside diameter A;
Inferior high purity surrounding layer outside diameter E is the diameter of bare fibre and the ratio of the core diameter of optical fiber with the ratio of sandwich layer outside diameter A, and for matched cladding type single-mode fiber, its value is between the 14.0-14.6;
The size of each layer is most preferably as follows among the present invention:
Inner cladding outside diameter B is 2.0 with the ratio of sandwich layer outside diameter A;
The low high-purity covering outside diameter of hydroxyl C is 3.5 with the ratio of sandwich layer outside diameter A;
High purity surrounding layer outside diameter D is 10.5 with the ratio of sandwich layer outside diameter A;
The ratio of inferior high purity surrounding layer outside diameter E and sandwich layer outside diameter A is the comparison matched cladding type single-mode fiber of the core diameter of the diameter of bare fibre and optical fiber, and its value is 14.3;
The high purity surrounding layer is 99.99% to 99.999% highly purified SiCl by content among the present invention 4Be prepared from, inferior high purity surrounding layer is the SiCl of 99.0% to 99.99% purity by content 4Be prepared from, inferior high purity surrounding layer outside diameter E is 20-200mm, and preferred E is 60 to 85mm, and most preferably E is 80mm.
Concrete manufacture method of the present invention may further comprise the steps successively:
(1) plug that the preparation of plug, this step are adopted is the same with the existing silica fibre plug that is used to make preform;
(2) at the outside surface of plug, be the highly purified SiCl of 99.99%--99.999% with content 4Be raw material, adopt pipe external sediment technology to make the high purity surrounding layer and make prefabricated rods; This prefabricated rods is the same with existing preform, only be external diameter and the ratio D/A of its core diameter of prefabricated rods more common preform little.
(3) at the outside surface of prefabricated rods, be the SiCl of 99.0%--99.99% with content 4Be raw material, employing is managed external sediment technology manufacturing time high purity surrounding layer and is made the multi-clad prefabricated rods.
Wherein step (2), (3) described pipe external sediment technology can be direct deposition methods, also can be the quartz socket tube methods.
The present invention can reduce the material cost of optical fiber, by effective resource allocation, make that the purity of raw materials of use is high more the closer to the centre portions of optical fiber, not only reduced material cost, manufacturing efficient and the ability that can also improve optical fiber properties and improve fibre-optical mandrel equipment.
Description of drawings
Fig. 1 is the diagrammatic cross-section of multi-clad prefabricated rods
Fig. 2 is the schematic perspective view of multi-clad prefabricated rods
Fig. 3 is the synoptic diagram with solid rod of inferior high purity surrounding layer
Fig. 4 is the synoptic diagram with inferior high purity telescopic prefabricated rods
Embodiment
Below in conjunction with accompanying drawing the present invention is described further:
The present invention includes plug and surrounding layer as Fig. 1, Fig. 2, plug is made of successively sandwich layer a, inner cladding b, the low high-purity covering c of hydroxyl, and surrounding layer is divided into high purity surrounding layer d and time high purity surrounding layer e, and the size of each layer is as follows:
Inner cladding b outside diameter B is 4.0 with the ratio of sandwich layer a outside diameter A;
The low high-purity covering c of hydroxyl outside diameter C is 5.0 with the ratio of sandwich layer a outside diameter A;
High purity surrounding layer d outside diameter D is 13.0 with the ratio of sandwich layer a outside diameter A;
Inferior high purity surrounding layer e outside diameter E is 15.2 with the ratio of sandwich layer a outside diameter A;
Wherein high purity surrounding layer d is 99.999% highly purified SiCl by content 4Be prepared from, inferior high purity surrounding layer e is 99.0% SiCl by content 4Be prepared from, inferior high purity surrounding layer e outside diameter E is 80mm.
The present invention also can adopt following embodiment:
Inner cladding b outside diameter B is 1.0 with the ratio of sandwich layer a outside diameter A;
The low high-purity covering c of hydroxyl outside diameter C is 2.0 with the ratio of sandwich layer a outside diameter A;
High purity surrounding layer d outside diameter D is 5.0 with the ratio of sandwich layer a outside diameter A;
Inferior high purity surrounding layer e outside diameter E is 13.5 with the ratio of sandwich layer a outside diameter A;
Wherein high purity surrounding layer d is 99.99% highly purified SiCl by content 4Be prepared from, inferior high purity surrounding layer e is 99.9% SiCl by content 4Be prepared from, inferior high purity surrounding layer e outside diameter E is 60mm.
It is preferred implementation that the present invention adopts following embodiment:
Inner cladding b outside diameter B is 2.0 with the ratio of sandwich layer a outside diameter A;
The low high-purity covering c of hydroxyl outside diameter C is 3.5 with the ratio of sandwich layer a outside diameter A;
High purity surrounding layer d outside diameter D is 10.5 with the ratio of sandwich layer a outside diameter A;
Inferior high purity surrounding layer e outside diameter E is 14.3 with the ratio of sandwich layer a outside diameter A;
Wherein high purity surrounding layer d is 99.995% highly purified SiCl by content 4Be prepared from, inferior high purity surrounding layer e is 99.9% SiCl by content 4Be prepared from, inferior high purity surrounding layer e outside diameter E is 80mm.
The preferred following method of the present invention is prepared from:
(1) plug that the preparation of plug, this step are adopted is the same with the existing silica fibre plug that is used to make preform;
(2) at the outside surface of plug, be the highly purified SiCl of 99.99%--99.999% with content 4Be raw material, adopt pipe external sediment technology to make the high purity surrounding layer and make prefabricated rods; This prefabricated rods is the same with existing preform, only be external diameter and the ratio D/A of its core diameter of prefabricated rods more common preform little.
(3) at the outside surface of prefabricated rods, be the SiCl of 99%--99.99% with content 4Be raw material, employing is managed external sediment technology manufacturing time high purity surrounding layer and is made the multi-clad prefabricated rods.
The low-hydroxyl and high-purity covering c of optical fiber is generally made by pipe external sediment technology, and it is the pure zirconia silicon layer, and it is generally made by pipe external sediment technology, and the material purity of employing is equal to or a little less than sandwich layer and inner cladding.Singly touch the process characteristic that optical fiber is made according to quartz, a, b and c constitute the mandrel segment of optical fiber.The pure surrounding layer d of the height of optical fiber adopts pipe external sediment technology to make, it adopts and makes at the direct deposition method of the outside surface of fibre-optical mandrel, the material purity of making this part material purity of making this part of having relatively high expectations is the same with the surrounding layer of existing optical fiber, have relatively high expectations, but will be lower than the employed purity of raw materials of mandrel segment.The inferior high purity surrounding layer e of optical fiber is to adopt pipe external sediment technology to make, and it adopts the direct deposition method of outside surface of superincumbent preform to make, and the purity of making the more common manufacturing surrounding layer of the material purity of this part is low, thereby price just.As shown in Figure 3, e is the inferior high purity surrounding layer of optical fiber, is to adopt pipe external sediment technology to make, and it adopts superincumbent a, b, and the direct deposition method of outside surface of c and the pairing prefabricated rods of d is prepared into.
The present invention also can adopt the alternate manner preparation:
For example, among the above-mentioned preparation method, step (2), (3) described pipe external sediment technology also can adopt the quartz socket tube method, and its adopts in type, have identical CSA high purity with pipe external sediment technology or inferior high-purity quartz tube forms high purity surrounding layer or inferior high purity surrounding layer.Step (2), (3) used starting material can be silicon oxide powders, also can be the organosilicon raw materials.
As shown in Figure 4, inferior high purity surrounding layer e also can adopt top a, b, the pairing prefabricated rods preform of c and d add in type high-purity quartz telescopic method and form, and the purity of making the more common manufacturing surrounding layer of the material purity of this part is low.

Claims (9)

1, a kind of multi-clad prefabricated rods, it comprises plug and surrounding layer, and plug is made of successively sandwich layer, inner cladding, the low high-purity covering of hydroxyl, and it is the highly purified SiCl of 99.99%--99.999% that surrounding layer divides for by content 4The high purity surrounding layer of forming and be the SiCl of 99.9%--99.99% by content 4The inferior high purity surrounding layer of forming, the size of each layer is as follows:
Inner cladding outside diameter B is 1.0-4.0 with the ratio of sandwich layer outside diameter A;
The low high-purity covering outside diameter of hydroxyl C is 2.0-5.0 with the ratio of sandwich layer outside diameter A;
High purity surrounding layer outside diameter D is 6.0-13.0 with the ratio of sandwich layer outside diameter A;
Inferior high purity surrounding layer outside diameter E is 13.5--15.2 with the ratio of sandwich layer outside diameter A.
2, according to a kind of multi-clad prefabricated rods of claim 1, wherein the size of each layer is as follows:
Inner cladding outside diameter B is 2.0-3.0 with the ratio of sandwich layer outside diameter A;
The low high-purity covering outside diameter of hydroxyl C is 3.0-4.0 with the ratio of sandwich layer outside diameter A;
High purity surrounding layer outside diameter D is 8.0-11.5 with the ratio of sandwich layer outside diameter A;
Inferior high purity surrounding layer outside diameter E is 14.0-14.6 with the ratio of sandwich layer outside diameter A.
3, according to a kind of multi-clad prefabricated rods of claim 1, wherein the size of each layer is as follows:
Inner cladding outside diameter B is 2.0 with the ratio of sandwich layer outside diameter A;
The low high-purity covering outside diameter of hydroxyl C is 3.5 with the ratio of sandwich layer outside diameter A;
High purity surrounding layer outside diameter D is 10.5 with the ratio of sandwich layer outside diameter A;
Inferior high purity surrounding layer outside diameter E is 14.3 with the ratio of sandwich layer outside diameter A.
4, according to each a kind of multi-clad prefabricated rods of claim 1 to 3, wherein time high purity surrounding layer outside diameter E is 20-200mm.
5, according to a kind of multi-clad prefabricated rods of claim 4, wherein time high purity surrounding layer outside diameter E is 80mm.
6, a kind of manufacture method of multi-clad prefabricated rods, it may further comprise the steps successively:
(1) preparation of plug;
(2) at the outside surface of plug, be the highly purified SiCl of 99.99%-99.999% with content 4Be raw material, adopt pipe external sediment technology to make the high purity surrounding layer and make prefabricated rods;
(3) at the outside surface of prefabricated rods, be the SiCl of 99.9%-99.99% with content 4Be raw material, employing is managed external sediment technology manufacturing time high purity surrounding layer and is made the multi-clad prefabricated rods.
7, according to the manufacture method of a kind of multi-clad prefabricated rods of claim 6, wherein step (2), (3) described pipe external sediment technology are direct deposition methods.
8, according to the manufacture method of a kind of multi-clad prefabricated rods of claim 6, wherein step (2), (3) described pipe external sediment technology are the quartz socket tube methods, and its adopts in typely has identical CSA high purity with the outer tube depositing operation or this high-purity quartz tube forms high purity surrounding layer or inferior high purity surrounding layer.
9, according to the manufacture method of a kind of multi-clad prefabricated rods of claim 6, wherein step (2), (3) used starting material are silicon oxide powder or organosilicon raw material.
CN02138975.6A 2002-08-28 2002-08-28 Prefabricated fiber rod with several clad layers and its fabrication Expired - Lifetime CN1217874C (en)

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Application Number Priority Date Filing Date Title
CN02138975.6A CN1217874C (en) 2002-08-28 2002-08-28 Prefabricated fiber rod with several clad layers and its fabrication

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CN1217874C true CN1217874C (en) 2005-09-07

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005060148A (en) * 2003-08-08 2005-03-10 Sumitomo Electric Ind Ltd Optical fiber preform production method, optical fiber preform, optical fiber production method, and optical fiber
CN100395203C (en) * 2005-08-17 2008-06-18 长飞光纤光缆有限公司 Method for preparing preformod of optical fiber with low water peak in large size
CN100357204C (en) * 2005-10-27 2007-12-26 上海大学 Semiconductor film inner packing layer enlarging optical fiber and its premade rod manufacturing method
CN106680931A (en) * 2017-03-16 2017-05-17 江苏亨通光导新材料有限公司 Low-loss optical fiber and production method thereof
CN112352176B (en) * 2018-05-04 2023-09-12 努布鲁有限公司 Three-clad optical fiber

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