CN102317826A - Optical fiber having improved bending loss characteristics and method for manufacturing the same - Google Patents
Optical fiber having improved bending loss characteristics and method for manufacturing the same Download PDFInfo
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- CN102317826A CN102317826A CN2010800073036A CN201080007303A CN102317826A CN 102317826 A CN102317826 A CN 102317826A CN 2010800073036 A CN2010800073036 A CN 2010800073036A CN 201080007303 A CN201080007303 A CN 201080007303A CN 102317826 A CN102317826 A CN 102317826A
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- 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
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
- G02B6/03638—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only
- G02B6/0365—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference having 3 layers only arranged - - +
Abstract
A method for manufacturing a trench-type optical fiber with excellent bending loss characteristics includes: (a) forming a core and a first clad layer by means of deposition; (b) preparing a tube containing hydroxyl (OH ) impurities not exceeding a predetermined level, and joining the tube around the first clad layer by means of over-cladding to form a second clad layer; and (c) forming a third clad layer around the second clad layer.
Description
Technical field
The present invention relates to make the method for optical fiber, relate more specifically to make the method for channel-type (trench-type) optical fiber with improved flexural property.
Background technology
The application requires the right of priority of on February 11st, 2009 at the korean patent application No.10-2009-0011034 of Korea S's submission, and its entirety is incorporated into through quoting as proof at this.
Along with the development of information and communication technology (ICT) recently to the increase in demand of bandwidth, optical fiber is widely used as the wire communication medium.Than the medium of other types, optical fiber have aspect loss and the bandwidth advantage but have inferior position aspect the processing, particularly except POF (polymer optical fiber).
Particularly, in FTTH (Fiber to the home) business, various little bendings, optical fiber can take place when being received or installing.In addition, existing optical fiber has big bending loss in little knee, therefore is not easy optical fiber to be installed or to be used the distributor (organizer) with little bending radius near the corner.In addition, DWDM (dense wave division multipurpose) system or CWDM (coarse wavelength division multiplexer) system that have the transmittability of enhancing use 1600nm wavelength period and existing 1550nm wavelength period.Yet, being used under the situation of 1600nm wavelength period at the existing fiber that has carried out to the 1550nm wavelength period optimizing, mode field diameter increases, and causes bending loss to increase.Thus, in order to prevent, require to improve optical fiber, so that be not more than bending loss in the 1550nm wavelength period at the bending loss of 1600nm wavelength period because of the loss increase causes the system transmissions characteristic degradation.
Because the bending loss characteristic of optical fiber becomes more important in the FTTH situation as stated, so the ITU-T of technology standardization association has set up the G657 standard optical fiber with the bending loss that reduces is handled as major issue.Particularly, these standards are classified as A type and Type B, the compatibility of A type standard treated and existing fiber (G652D) wherein, but more importantly, the Type B standard except with more strictly treat bending loss the compatibility of G652.
Fig. 1 is the table that the bending loss characteristic of optical fiber is shown.
As shown in Figure 1, although standard is classified as A type and Type B, along with nearest technological innovation, the optical fiber of throwing at present on the market trends towards having the compatibility of A type and the bending loss characteristic of Type B.In addition, in the FTTH situation particularly advantageous ultralow bend loss optical fiber (allow R5mm crooked) also by commercialization.
Because the bending loss characteristic of optical fiber is presented, so proposed a lot of implementations, is described below.
At first, in order to improve based on SI (ladder refractive index) structure, require to reduce MAC value (=MFD/ ends), this SI structure is a kind of existing SMF (single-mode fiber) optical fiber structure.This makes it possible to farthest limit the light that gets into fiber optic hub, prevents that thus the light when fibre-optical bending from leaking.Although the structure according to optical fiber possibly have any difference, the Mac value has like in the following formula 1 and relation bending loss generally.
Loss＝exp[8.5-519*D
mm(1/λ*Mac)
3]
λ: wavelength (nm), D
Mm: bending diameter
When adopting the SI structure, reduce bending loss through reducing the Mac value, but this possibly cause the problem (because difference of MFD) with the compatibility of existing fiber.
Improvement as existing SI structure has proposed a kind of depression (depressed) structure (referring to Fig. 2).In this sunk structure, the covering 2-b adjacent with core 2-a compares the refractive index with reduction with existing covering.If use this sunk structure, then compare the compatibility of having improved with G652 optical fiber, and reduced bending loss with the SI structure.This sunk structure is usually through realizing as a kind of VAD technology in the external deposition method.
With this sunk structure, a kind of raceway groove (trench) structure has also been proposed as improving (referring to Fig. 3).In this channel structure, the covering 3-b adjacent with core 3-a keeps its refractive index identical with outermost layer covering 3-d, and the refractive index reduction part 3-c that is similar to sunk structure is positioned at the suitable distance apart from core 3-a.Compare some complicacy of this structure with sunk structure, therefore adopt inside deposition technology to this structure usually, rather than VAD technology, in this inside deposition technology, can easily adjust refractive index.Yet this structural table reveals excellent bending loss characteristic, is therefore much studying to realize this structure through VAD technology.
The technology that reduces bending loss through channel structure is open in US patent application publication US20080056658, korea patent registration No.0820926 and korean patent application communique No.2007-0101145.
These technical advices can reduce bending loss through channel structure.Yet except bending loss, suggestion does not reduce hydroxyl (hydroxyl, OH
-) loss (very important in the G657 standard) and do not advise throughput rate.In other words, being proposed to be used in the channel structure that reduces bending loss possibly cause problem aspect OH loss and the throughput rate, but does not have the essence solution.
Optic fibre manufacturing technology is divided into inside deposition technology and outside deposition technology generally.In inside deposition technology, the chemical constitution of mixing with proper proportion deposits in pipe, makes optical fiber have the refractive index of expectation.This technology can be reproduced the refractive index of relative complex, but poorer than outside deposition technology aspect OH loss characteristic and throughput rate.
Outside deposition technology comprises VAD (vapor-phase axial deposition) and OVD (outside gas deposition).Under the situation of VAD, the inside of core is not exposed to the outside during technology, and therefore VAD is more much better than OVD aspect the OH loss.For this reason, because its excellent OH loss characteristic and excellent productivity, when making had the SMF of simple relatively structure, fiber manufacturers extensively adopted VAD technology.
Summary of the invention
Technical matters
Yet, when using VAD technology to make the optical fiber of channel structure, following problem appears.
At first, the adjacent setting with core of channel part with optical fiber is favourable with the bending loss in the channel structure that reduces optical fiber.At this moment, when Application V AD technology, in order to realize channel structure, core manufacturing and the covering that contacts with core then form next zone (perhaps channel part) through outside deposition.In the case, because the covering adjacent with core has littler thickness, so when forming next zone (perhaps channel part), increase unfriendly owing to OH impurity makes the OH loss of optical fiber through outside deposition.
In addition, in order to form the channel structure of optical fiber, existing VAD technology is changed into three phase deposition from two phase deposition.For this reason, aspect the throughput rate of one of significant advantage of VAD technology serious problem is appearring.
The present invention designs in order to solve prior art problems; Therefore the purpose of this invention is to provide a kind of method that under the situation of Application V AD technology, has the manufacturing optical fiber of the OH loss that reduces and improved throughput rate, have the optical fiber with channel structure of excellent flexural property with making.The present invention also is devoted to provide a kind of optical fiber of making through above method.
Will be in following explanations and understand from the description subsequently of embodiment easily in other purposes of the present invention and aspect.In addition, objects and advantages of the present invention can realize through ingredient or its combination that limits in the appended claim.
Technical scheme
To achieve these goals, the present invention provides a kind of manufacturing to have the method for the channel-type optical fiber of excellent bending loss characteristic, and said method comprises: (a) form the core and first covering through deposition; (b) preparation comprises the hydroxyl (OH that is no more than intended level
-) pipe of impurity, and through outer covering layer technology (over-cladding) said circumference of cannon bone is engaged to form second covering around said first covering; And (c) form triple clad around said second covering.
Prepared pipe preferably has predetermined refractive index; And refractive index according to triple clad; Said pipe preferably has-0.1% to-1.0% mark (fractional) variations in refractive index (D); The mark variations in refractive index (D) of wherein said pipe equals (N3-N4)/N4, and wherein N3 is the refractive index of second covering, and N4 is the refractive index of triple clad.
In addition, prepared pipe preferably comprises 10ppm or hydroxyl (OH still less
-) impurity.In addition, in step (a), the core and first covering preferably form through deposition.
In addition, step (a) can comprise: (a-1) form the core and first covering through cigarette ash (sooting) technology; (a-2) remove hydroxyl impurity through dehydration (dehydration) technology from the said core and first covering; (a-3) through sintering (sintering) technology the said core and first covering are carried out sintering to make porous preform; And (a-4) prolong said porous preform through prolonging (elongation) technology.
Preferably, step (b) comprising: (b-1) preparation comprises the hydroxyl (OH that is no more than intended level
-) overclad tubes of impurity; The phase one prefabricated component that (b-2) will have the said core and first covering is inserted in the said overclad tubes; And (b-3), said overclad tubes melts said overclad tubes to join said overclad tubes to the phase one prefabricated component through being heated.
In addition, in step (c), preferably form triple clad around second covering through outside deposition or outer covering layer technology.
In another aspect of this invention, a kind of optical fiber according to the improved bending loss characteristic of having of said method manufacturing also is provided.
In still another aspect of the invention; A kind of optical fiber with improved bending loss characteristic also is provided; This optical fiber comprises: first covering that is positioned at the core at the center of this optical fiber, forms around said core, second covering that forms around first covering and the triple clad that forms around second covering; Wherein said core have greater than first, second with the largest refractive index of triple clad in any one largest refractive index; And the largest refractive index of second covering less than first and the largest refractive index of triple clad in any one, and wherein second covering comprises 10ppm or hydroxyl (OH still less
-) impurity.
Preferably, second covering is to join first covering through the pipe that will before prepare to through outer covering layer technology to form.
Beneficial effect
According to the present invention, when manufacturing have excellent flexural property have the optical fiber of channel structure the time, use the pipe of previous preparation to form second covering as channel part through outer covering layer technology, therefore can practice thrift the production time and boost productivity.
In addition, when forming second covering through jacket, the hydroxyl (OH that comprises in the prepared pipe
-) the amount Be Controlled, therefore can reduce the OH loss of the final optical fiber of making.
Description of drawings
To become obvious with reference to accompanying drawing from explanation other purposes of the present invention and the aspect of subsequently embodiment.Wherein:
Fig. 1 is the table that the bending loss standard of optical fiber is shown;
Fig. 2 is the synoptic diagram that illustrates through the umbilicate type optical fiber that improves existing SI structure acquisition;
Fig. 3 is the synoptic diagram that illustrates through the channel-type optical fiber that improves existing sunk structure acquisition;
Fig. 4 is the synoptic diagram that illustrates according to the optical fiber of the improved bending loss characteristic of having of an embodiment of the invention manufacturing;
To be illustration have the process flow diagram of method of the optical fiber of improved bending loss characteristic according to the manufacturing of an embodiment of the invention to Fig. 5;
Fig. 6 illustrates the synoptic diagram of example of each technology of method that manufacturing according to an embodiment of the invention has the optical fiber of improved bending loss characteristic;
Fig. 7, Fig. 8 and Fig. 9 illustrate the synoptic diagram of manufacturing according to the example of the technology of the phase one prefabricated component of the optical fiber of an embodiment of the invention;
Figure 10 illustrates the synoptic diagram of manufacturing according to the example of the outer covering layer technology of the subordinate phase prefabricated component of the optical fiber of an embodiment of the invention; And
Figure 11 is the table that illustrates according to the measurement characteristics of the optical fiber of the improved bending loss characteristic of having of an embodiment of the invention manufacturing.
< Reference numeral of the critical piece in the accompanying drawing >
A: core b: first covering
C: the second covering d: triple clad
Embodiment
Hereinafter, describe preferred implementation of the present invention in detail with reference to accompanying drawing.Before describing; Should understand the term that uses in this instructions and the appended claim should not be construed as and be limited to usually and the implication in the dictionary; And should be according to allowing the inventor suitably define the principle of term for best explanation, based on explaining with corresponding implication of technical elements of the present invention and notion.Therefore, only be preferred exemplary in the explanation of this proposition, and be not intended to limit scope of the present invention, therefore should understand and to carry out other to the present invention and be equal to and revise and do not deviate from essence of the present invention and scope for the illustration purpose.
Fig. 4 is the synoptic diagram that illustrates according to the optical fiber of the improved bending loss characteristic of having of an embodiment of the invention manufacturing.
With reference to Fig. 4, optical fiber constructed in accordance comprises the core (a) that is positioned at the center, around first covering (b) of core (a), around second covering (c) of first covering (b) with around the triple clad (d) of second covering (c).This optical fiber is the channel-type optical fiber with the channel part that is similar to second covering (c).
Core (a) has greater than first to (c) any one the largest refractive index N1 among the largest refractive index N2, N3, N4 of (d) of triple clad (b).The largest refractive index N3 of second covering (c) is less than first and (d) largest refractive index N2 of triple clad (b), each among the N4.
In addition, second covering (c) comprises the hydroxyl (OH that is no more than 10ppm
-) impurity.For this reason, when making, make second covering (c) through the periphery that outer covering layer technology joins first covering (b) to through the pipe that comprises 10ppm or hydroxyl impurity still less that will before prepare according to optical fiber of the present invention.
Explanation is according to each characteristic value of the structure of optical fiber now.At first, core (a) has the radius R 1 of 3.5mm to 4.5mm.Suppose that first covering (b) has radius R 2, the value of R2/R1 is set to 1.5 to 6.5.In addition, suppose that second covering (c) has radius R 3, the value of R3-R2 is set to 1.0mm to 10.0mm.The radius R 4 of triple clad (d) is set to 62.5mm.
In addition, in the middle of the characteristic of optical fiber structure, the mark variations in refractive index based on triple clad is described.At this, calculate Dn=(Nn-N4)/N4 with following formula based on the mark variations in refractive index of triple clad.At first, core (a) is configured to have 0.3% to 0.5% mark variations in refractive index D1.First covering (b) is configured to have-0.1% to 0.1% mark variations in refractive index D2.Second covering (c) is configured to have-1.0% to-0.1% mark variations in refractive index D3.
The method of this optical fiber is made in explanation hereinafter.
To be illustration have the process flow diagram of method of the optical fiber of improved bending loss characteristic according to the manufacturing of an embodiment of the invention to Fig. 5.Fig. 6 illustrates the example of each technology of method that manufacturing according to an embodiment of the invention has the optical fiber of improved bending loss characteristic.
With reference to Fig. 5 and Fig. 6, in the method for manufacturing optical fiber according to the present invention, at first, form the core (a) and first covering (b) in the core zone that is positioned at optical fiber through deposition, dehydration and sintering.At this moment, core (a) and first covering (b) are made as suitable geometry to satisfy the characteristic value (for example core and radius) according to optical fiber of the present invention.In addition, first covering (b) that forms this moment has the refractive index (S10) relatively littler than core (a).
Through this technology, made the phase one prefabricated component of forming by the zone of the zone of core (a) and first covering (b).
Then, carry out the technology for preparing second covering (c) that will form around the periphery of phase one prefabricated component.In other words, preparation in advance will be used to make the pipe with predetermined properties of second covering (c).This pipe is a tubular cylinder shape prefabricated component, will this pipe be joined to the periphery of first covering (b) through outer covering layer technology.Prepared pipe also is called as overclad tubes (over-clad tube).In addition, prepared pipe comprises the hydroxyl (OH that is no more than intended level
-) impurity.More specifically, the hydroxyl impurity that comprises in the prepared pipe is no more than 10ppm.The pipe that comprises the hydroxyl impurity of less amount is preferred (S20).
If prepared overclad tubes as stated, then prepared pipe is positioned at first covering (b) on every side, then joins this pipe to first covering (b) through outer covering layer technology.This outer covering layer technology also is called as " jacket ".Prepared circumference of cannon bone engages to form second covering (c) around first covering (b).If formed the zone of second covering (c) as stated, then made the subordinate phase prefabricated component.Second covering (c) that form this moment has than the relatively little refractive index of first covering (b).In this optical fiber structure, second covering is called as channel part (S30).
If prepared the subordinate phase prefabricated component, then carry out the technology of the triple clad (d) of the periphery that forms second covering (c) that centers on the subordinate phase prefabricated component.Triple clad (d) forms through deposition or outer covering layer technology.In addition, triple clad (d) has than the big relatively refractive index of second covering (c).If formed the zone of triple clad (d) as stated, then made phase III prefabricated component (S40).
If made the phase III prefabricated component, then carry out the technology of characteristic value of each assembly of stretching/PT technology and measurement and assessment optical fiber.
Particularly, form second covering (c), so this pipe is configured to have-0.1% to-1.0% the mark variations in refractive index based on the refractive index of triple clad (d) through the prepared pipe that outer covering layer technology engages around first covering (b).
Illustrate in greater detail the outside deposition technology of the phase one prefabricated component that making is made up of core (a) and first covering (b) below.
Fig. 7, Fig. 8 and Fig. 9 illustrate the example of making according to the technology of the phase one prefabricated component of the optical fiber of an embodiment of the invention.
At first, Fig. 7 illustration cigarette ash technology, the deposited fine glass particles that wherein from burner, produces through flame hydrolysis is to the outside of prefabricated component.
Then, Fig. 8 illustration use Cl
2Gas is removed the technology of hydroxyl impurity from the porous preform of the cigarette ash technology acquisition of Fig. 7.In other words, in chamber, produce Cl
2Environment removes the hydroxyl (hydroxyl group) (dewatering process) that comprises in the prefabricated component.Subsequently, the porous preform of having removed impurity is carried out sintering (sintering process).
After as stated prefabricated component being carried out sintering, make prefabricated component extend to suitable thickness (prolongation technology).Fig. 9 shows the example that prolongs technology.As shown in Figure 9, thermal source is positioned at around the prefabricated component, then through extension unit prefabricated component is prolonged with control thickness.As stated, prolong the prefabricated component that speed can obtain to expect thickness and geometry through adjustment and control.
Be used for through on the phase one prefabricated component, forming the outer covering layer technology that second covering is made the subordinate phase prefabricated component referring now to Figure 10 description.
Figure 10 illustrates the example that is used to make according to the outer covering layer technology of the subordinate phase prefabricated component of the optical fiber of an embodiment of the invention.
Outer covering layer technology shown in Figure 10 also is called " jacket " and is used to cover and engage the pipe on first prefabricated component.In this technology, preparation has suitable refractive index and comprises the overclad tubes of controlled impurity, and the phase one prefabricated component that then will make as stated is inserted in this pipe.Use welding torch to wherein having inserted the pipe heating of phase one prefabricated component, make this pipe fusing thus and join this pipe to the phase one prefabricated component.At this moment, the inside of pipe keeps negative pressure to impel joint.At this; Owing to use the pipe have suitable refractive index and to comprise controlled impurity to form second covering as channel part; So compare with the situation that forms second covering through outside deposition, can reduce the degree of the hydroxyl impurity that wherein comprises such as VAD.Thus, can reduce the OH loss of the final optical fiber of making.In addition, make channel-type optical fiber in order to use VAD, both should form first and second coverings through outside deposition, and therefore manufacturing process should be changed into three phase deposition from two phase deposition.Thus, the throughput rate as the significant advantage of VAD is seriously worsened.
Figure 11 is the table that illustrates according to the characteristic value of the measurement of the optical fiber of the improved bending loss characteristic of having of an embodiment of the invention manufacturing.
Referring to Figure 11, list 8 embodiments in the table altogether according to optical fiber of the present invention.
Optical fiber (perhaps channel-type optical fiber) according to each embodiment satisfies said structure characteristic value of the present invention.In other words, list on the radius R 1 of core, R2/R1, R3-R2 and R4 value and the top of mark variations in refractive index value in table.All embodiment satisfies above-mentioned characteristic value of the present invention.
Then, the pipe that is used for making up through outer covering layer technology the zone of second covering has 1.45309 refractive index at whole embodiments.The degree of the hydroxyl impurity that comprises in this pipe in addition, is 1.5 to 1.9ppm.In addition, triple clad (perhaps outermost covering) is made through deposition or jacket separably.Because second covering forms through jacket, so can practice thrift the production time.When using deposition in order to form triple clad, than conventional situation, the saving production time reaches 20%.In addition, when using jacket in order to form triple clad, the saving production time reaches 40%.
The characteristic of the optical fiber of making according to the embodiment of the present invention as stated is shown in the table.At first, MFD and cut-off characteristics are shown.Therewith, the loss characteristic at 1383nm place is shown also, is appreciated that according to these optical fiber according to the embodiment of the present invention has littler loss than the optical fiber of existing (fully through deposition make).
In addition, the bending loss value of zero dispersion values and measurement is shown.At this, satisfy the G657B standard at 1550nm and 1625nm place according to the bending loss value of the measurement of optical fiber of the present invention.
The bottom that is evaluated at table of the characteristic value of optical fiber according to the embodiment of the present invention illustrates.Whole 8 embodiments satisfy the compatibility of G657A standard and satisfied and G652 optical fiber.In addition, OH loss satisfactorily is 0.330 or littler in whole embodiments.In addition, consider the throughput rate of embodiment of the present invention, be appreciated that the production time saving reaches 20% to 40%.
Describe the present invention in detail.Yet; Although should be understood that and represented preferred implementation of the present invention, these are described in detail and concrete example only is to provide with way of example; Because specify according to this, the variations and modifications in essence of the present invention and the scope will become obvious to those skilled in the art.
Claims (11)
1. a manufacturing has the method for the channel-type optical fiber of excellent bending loss characteristic, and said method comprises:
(a) form the core and first covering through deposition;
(b) preparation comprises the hydroxyl OH that is no more than intended level
-The pipe of impurity, and through outer covering layer technology said circumference of cannon bone is engaged to form second covering around said first covering; And
(c) form triple clad around said second covering.
2. manufacturing according to claim 1 has the method for the channel-type optical fiber of excellent bending loss characteristic,
Wherein, in said step (b), prepared pipe has predetermined refractive index.
3. manufacturing according to claim 2 has the method for the channel-type optical fiber of excellent bending loss characteristic,
Wherein, said pipe has-0.1% to-1.0% mark variations in refractive index D based on the refractive index of said triple clad,
Wherein, the mark variations in refractive index D of said pipe equals (N3-N4)/N4, and wherein N3 is that the refractive index and the N4 of said second covering are the refractive indexes of said triple clad.
4. manufacturing according to claim 1 has the method for the channel-type optical fiber of excellent bending loss characteristic,
Wherein, in said step (b), prepared pipe comprises 10ppm or hydroxyl OH still less
-Impurity.
5. manufacturing according to claim 1 has the method for the channel-type optical fiber of excellent bending loss characteristic,
Wherein, in said step (a), said core and said first covering form through deposition.
6. manufacturing according to claim 1 has the method for the channel-type optical fiber of excellent bending loss characteristic, and wherein, said step (a) comprising:
(a-1) form the core and first covering through cigarette ash technology;
(a-2) remove hydroxyl impurity through dewatering process from said core and said first covering;
(a-3) through sintering process said core and said first covering are carried out sintering to make porous preform; And
(a-4) prolong said porous preform through prolonging technology.
7. manufacturing according to claim 1 has the method for the channel-type optical fiber of excellent bending loss characteristic, and wherein, said step (b) comprising:
(b-1) preparation comprises the hydroxyl OH that is no more than intended level
-The overclad tubes of impurity;
The phase one prefabricated component that (b-2) will have said core and said first covering is inserted in the said overclad tubes; And
(b-3) through being heated, said overclad tubes melts said overclad tubes, said overclad tubes is joined to said phase one prefabricated component.
8. manufacturing according to claim 1 has the method for the channel-type optical fiber of excellent bending loss characteristic,
Wherein, in said step (c), form said triple clad around said second covering through outside deposition or outer covering layer technology.
9. optical fiber with improved bending loss characteristic, this optical fiber are to make according to any described method in the claim 1 to 8.
10. optical fiber with improved bending loss characteristic; This optical fiber comprises: first covering that is positioned at the core at the center of this optical fiber, forms around said core, second covering that forms around said first covering and the triple clad that forms around said second covering
Wherein, Said core has greater than any one largest refractive index in the largest refractive index of said first covering, said second covering and said triple clad; And the largest refractive index of said second covering is less than any one in the largest refractive index of said first covering and said triple clad, and
Wherein, said second covering comprises 10ppm or hydroxyl OH still less
-Impurity.
11. the optical fiber with improved bending loss characteristic according to claim 10,
Wherein, said second covering is to join first covering through the pipe that will before prepare to through outer covering layer technology to form.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR10-2009-0011034 | 2009-02-11 | ||
| KR1020090011034A KR20100091710A (en) | 2009-02-11 | 2009-02-11 | Method for manufacturing optical fiber improvement of bending loss and optical fiber manufactured using the same |
| PCT/KR2010/000887 WO2010093187A2 (en) | 2009-02-11 | 2010-02-11 | Optical fiber having improved bending loss characteristics and method for manufacturing the same |
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| CN102317826A true CN102317826A (en) | 2012-01-11 |
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| KR (1) | KR20100091710A (en) |
| CN (1) | CN102317826A (en) |
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| WO2020155707A1 (en) * | 2019-01-29 | 2020-08-06 | 江苏永鼎股份有限公司 | Optical fiber preform rod of large size and low loss and preparation method therefor |
| WO2020181788A1 (en) * | 2019-03-11 | 2020-09-17 | 江苏永鼎光纤科技有限公司 | Method for manufacturing optical fiber preform based on sleeve method |
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| EP3185056A4 (en) * | 2014-09-26 | 2018-05-16 | Fujikura, Ltd. | Optical fiber |
| JP7371011B2 (en) | 2018-12-12 | 2023-10-30 | 古河電気工業株式会社 | Optical fiber and optical fiber manufacturing method |
| JP7019617B2 (en) * | 2019-02-07 | 2022-02-15 | 古河電気工業株式会社 | Optical fiber and manufacturing method of optical fiber |
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| KR102375092B1 (en) * | 2019-09-05 | 2022-03-16 | 한국광기술원 | Optical Fiber for Removing Cladding Mode and Manufacturing Method Thereof |
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|---|---|---|---|---|
| EP1657575A4 (en) * | 2003-04-11 | 2008-03-19 | Fujikura Ltd | Optical fiber |
| ES2417634T3 (en) * | 2008-02-22 | 2013-08-08 | Sumitomo Electric Industries, Ltd. | Fiber optic and optical cable |
-
2009
- 2009-02-11 KR KR1020090011034A patent/KR20100091710A/en not_active Application Discontinuation
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2010
- 2010-02-11 WO PCT/KR2010/000887 patent/WO2010093187A2/en active Application Filing
- 2010-02-11 CN CN2010800073036A patent/CN102317826A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001240424A (en) * | 2000-02-29 | 2001-09-04 | Sumitomo Electric Ind Ltd | Manufacturing method of base material of optical fiber |
| CN1430584A (en) * | 2000-05-24 | 2003-07-16 | 赫罗伊斯·坦尼沃有限公司 | Method for producing optical fibre and blank for optical fibre |
| CN1768282A (en) * | 2003-04-11 | 2006-05-03 | 株式会社藤仓 | Optical fiber |
| CN1727931A (en) * | 2004-07-28 | 2006-02-01 | 京瓷株式会社 | Optical fiber connected body with mutually coaxial and inclined cores, optical connector |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2017206616A1 (en) * | 2016-06-01 | 2017-12-07 | 中天科技光纤有限公司 | Optical fiber, optical fiber preparation process, and optical fiber preparation system |
| WO2020155707A1 (en) * | 2019-01-29 | 2020-08-06 | 江苏永鼎股份有限公司 | Optical fiber preform rod of large size and low loss and preparation method therefor |
| WO2020181788A1 (en) * | 2019-03-11 | 2020-09-17 | 江苏永鼎光纤科技有限公司 | Method for manufacturing optical fiber preform based on sleeve method |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010093187A3 (en) | 2010-10-21 |
| KR20100091710A (en) | 2010-08-19 |
| WO2010093187A2 (en) | 2010-08-19 |
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Application publication date: 20120111 |