CN203811839U - Bending insensitive single-mode optical fiber - Google Patents
Bending insensitive single-mode optical fiber Download PDFInfo
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- CN203811839U CN203811839U CN201420149682.8U CN201420149682U CN203811839U CN 203811839 U CN203811839 U CN 203811839U CN 201420149682 U CN201420149682 U CN 201420149682U CN 203811839 U CN203811839 U CN 203811839U
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- Prior art keywords
- optical fiber
- fluorine
- fiber
- refractive index
- covering
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 60
- 238000005452 bending Methods 0.000 title abstract description 38
- 239000000835 fiber Substances 0.000 claims abstract description 66
- 238000005253 cladding Methods 0.000 claims abstract description 49
- 238000007665 sagging Methods 0.000 claims description 28
- YCKRFDGAMUMZLT-UHFFFAOYSA-N Fluorine atom Chemical compound [F] YCKRFDGAMUMZLT-UHFFFAOYSA-N 0.000 claims description 26
- 229910052731 fluorine Inorganic materials 0.000 claims description 26
- 239000011737 fluorine Substances 0.000 claims description 26
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 10
- 230000008595 infiltration Effects 0.000 claims description 3
- 238000001764 infiltration Methods 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 12
- 238000004519 manufacturing process Methods 0.000 abstract description 5
- 238000000151 deposition Methods 0.000 abstract description 4
- 238000010304 firing Methods 0.000 abstract 1
- 229920002994 synthetic fiber Polymers 0.000 abstract 1
- 238000005491 wire drawing Methods 0.000 abstract 1
- 238000009826 distribution Methods 0.000 description 14
- 239000000203 mixture Substances 0.000 description 6
- 230000000994 depressogenic effect Effects 0.000 description 4
- 230000008021 deposition Effects 0.000 description 3
- 239000002086 nanomaterial Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000004038 photonic crystal Substances 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229940085805 fiberall Drugs 0.000 description 1
- 229910052732 germanium Inorganic materials 0.000 description 1
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Abstract
The utility model discloses a bending insensitive single-mode optical fiber. The bending insensitive single-mode optical fiber comprises a fiber core and cladding layers, and the cladding layers outside the fiber core comprise an inner cladding layer, a fluorine-doped refractive-index-depressed cladding layer and an outer cladding layer. The manufacturing method comprises the following steps of (1) manufacturing a core rod by means of a VAD method; (2) manufacturing the fluorine-doped refractive-index-depressed cladding layer by means of an OVD method; (3) depositing the outer cladding layer outside the fluorine-doped refractive-index-depressed cladding layer to prepare a fluorine-doped cladding pipe; (4) inserting the core rod into the fluorine-doped cladding pipe and firing the core rod and the fluorine-doped cladding pipe into one body; and (5) drawing the manufactured fiber rod into optical fibers in a fiber wire drawing step. Compared with a optical fiber of the same kind, the bending insensitive single-mode optical fiber is better in bending resistance and smaller in bending loss, and is more compatible with a G.652D optical fiber, and the manufacturing method is simple.
Description
Technical field
The utility model relates to several field fibers, particularly relates to a kind of bend-insensitive single-mode optical fiber.
Background technology
Along with Access Network and FTTH development, for optical fiber, new requirement is also proposed, at this time traditional, a large amount of G.652 optical fiber using can not meet user demand completely in some occasion, so the Dec of 2006, ITU has released the standard of new G.657 bending loss insensitive single-mode fiber (bending loss insensitive single mode optical fiber), and G.657 G.657A optical fiber be divided into and two classes G.657B.G.657A need with the G.652D optical fiber of routine completely compatiblely, bending radius may diminish to 10mm; G.657B optical fiber is not imposed with completely compatible with optical fiber G.652D, but in bending property, has higher requirement.Bending radius may diminish to 7.5mm.
Along with the development of fiber optic applications G.657, the index of bending loss is proposed to more and more higher requirement, particularly, in the multitenant unit and house wiring system of FTTH, bending radius need to drop to 5mm.In order to adapt to new market development, in October, 2009, the new criteria that it is 5mm that ITU has increased for bending radius in standard G.657, like this, G.657 optical fibre packages has contained the kind of three kinds of minimum bending radius, as shown in the table:
Category-A: (need with G.652 compatible)
| Bending radius | G.657. A1 | G.657. A2 | G.657. A3 |
| 10 mm | The every circle of 0.75dB/ | ? | ? |
| 7.5 mm | ? | The every circle of 0.5dB/ | ? |
| 5 mm | ? | ? | The every circle of 0.15dB/ |
Category-B: (not needing with G.652 compatible)
| Bending radius | G.657. B2 | G.657. B3 |
| 7.5 mm | The every circle of 0.5dB/ | ? |
| 5 mm | ? | The every circle of 0.15dB/ |
The light field of the HE11 mould transmitting in single-mode fiber in straight optical fiber is the symmetrical Gaussian distribution centered by axis.In the time of fibre-optical bending, the covering direction migration laterally of the center line of light field, light field is no longer gaussian shaped profile, and forms longer afterbody in covering outside.In the time that light wave is advanced, the path of advancing than central field in the tail field in outside is long, for whole mould field synchronization, must advance with higher speed in tail field, be more that the tail field speed degree in outside is high, like this, the speed of outermost tail field will exceed the light velocity, and this part tail field just loses, and causes bending loss.The bending loss of single-mode fiber is relevant with the concentration degree (confinement) of light field to a great extent.The concentration degree of field is defined as the ratio of light intensity on fiber core part light intensity and the whole cross section of optical fiber.As can be seen here, (MFD) is less for mode field diameter, and the concentration degree of field is just higher, and bending loss will be less.Therefore, the design of various novel G.657 optical fiber invariably taking improve concentration degree as the starting point.
At present, G.657 the structure of optical fiber probably can be divided five classes, as shown in Figure 1.Wherein (a) is little doped core optical fiber (small core fiber); (b) be depressed cladding index distribution optical fiber (depressed cladding fiber or title protected core fiber); (c) be the sagging cladding index profile fiber (trench – assisted fiber) of circular groove shape; (d) be porous cladding optical fiber (hole-assisted fiber); (e) be stochastic distribution micropore cladded-fiber (random void fiber or title nanoStructures fiber).Wherein first three class is all-glass fiber structure, and rear two classes are air clad structure.
Analyzed respectively below:
(1) little doped core optical fiber (small core fiber), is in the G.652 optical fiber of routine, reduces core diameter, improves bending property to reduce mode field diameter.
(2) depressed cladding index distribution optical fiber (depressed cladding fiber) is by SiO
2in covering, mix F and form umbilicate type refractive index covering, improve bending property with the concentration degree that improves field.
(3) the sagging cladding index profile fiber (trench – assisted fiber) of circular groove shape, this type optical fiber clad region arrange with the poor larger circular groove shape refractive index bogging down area of cladding index, can improve the concentration degree (confinement) of light field at fibre core, as shown in Figure 2, wherein, (1) standard fiber, (2) circular groove shape cladding index optical fiber that sink, (3) stochastic distribution micropore cladded-fiber.
(4) porous cladding optical fiber (hole-assisted fiber), this type optical fiber is actually from photonic crystal fiber (photonic crystal fiber, PCF) and is transformed.Due to its design feature, in the time of bending, not only loss is low, and bending stress is also much smaller than solid core fibres.But PCF cannot with standard fiber compatibility, can not with the mutual welding of standard fiber.Large-scale production is also quite difficult.
(5) stochastic distribution micropore cladded-fiber (nanoStructures fiber); Be the product of being developed by Corning Incorporated, its commodity are called ClearCurveTM optical fiber.This kind of optical fiber is made up of with the covering of the nanometer air micropore that is provided with annular stochastic distribution the fibre core of mixing germanium.Say from optical effect, it is the same with the sagging cladding index profile fiber (trench – assisted fiber) of circular groove shape, is all that the sagging cladding index of annular distributive province is set in covering.Venerating is the physics mode difference adopting, and one is to realize refractive index and sink by mixing fluorine, and one is to adopt air micropore to reduce flat refractive index, (air refraction is 1).Pore size arrives between hundreds of nanometer in several nanometers.Just because of this, the analysis of the leaded light principle of the sagging cladding index profile fiber of above-mentioned circular groove shape is completely applicable to this micropore cladded-fiber.But because of physical arrangement difference, thereby make this type optical fiber present unique advantage: the sagging covering of stochastic distribution micropore refractive index and SiO
2the refractive index contrast of covering can be up to a few percent, and the refractive index contrast of mixing fluorine layer and covering is ppt.Thereby the second leaded light interface here oneself be not traditional " a little less than lead " property.Compared with this cladding index profile fiber that sink with circular groove shape, its wall effect to light field tail field is much better than.
The manufacture craft of stochastic distribution micropore cladded-fiber (nanoStructures fiber) is to combine to make preform with the moulding process of traditional gas-phase deposition and microbubble.
Standard fiber, the sagging cladding index optical fiber of circular groove shape and stochastic distribution micropore cladded-fiber all can be made of traditional optical wand gas-phase deposition, and the counter-bending best results of the sagging cladding index profile fiber of circular groove shape, the sagging cladding index optical fiber of circular groove shape and stochastic distribution micropore cladded-fiber need combine to make by gentle bubble moulding process with traditional gas-phase deposition, and technique is quite complicated.But the counter-bending effect of traditional bend-insensitive single-mode optical fiber need to improve, with G.652D compatibility is also to be improved.
Utility model content
The technical matters that the utility model mainly solves is to provide a kind of bend-insensitive single-mode optical fiber, has better bending resistance and less bending loss than traditional same type optical fiber, and with G.652D have better compatibility, and method for making is simple.
For solving the problems of the technologies described above, the technical scheme that the utility model adopts is: a kind of bend-insensitive single-mode optical fiber is provided, comprises: fibre core and covering, and fiber core refractive index is poor is, wherein, is fiber core refractive index, is covering basal plane refractive index; Covering outside fibre core is followed successively by inner cladding from inside to outside, mix fluorine refractive index sink covering and surrounding layer, in clad region, mixes the fluorine refractive index cladding index of sinking poor, wherein, and for mixing the fluorine refractive index covering that sink.
In preferred embodiment of the utility model, described core diameter is 8 μ m ~ 8.5 μ m.
In preferred embodiment of the utility model, described cladding diameter is 121 μ m ~ 128 μ m.
In preferred embodiment of the utility model, mixing the sagging covering inside radius of fluorine refractive index is 16 μ m ~ 20 μ m, and mixing the sagging covering external radius of fluorine refractive index is 37 μ m ~ 43 μ m.
In preferred embodiment of the utility model, the described sagging covering of fluorine refractive index of mixing comprises SiO
2porous base tube, at described SiO
2in porous base tube, infiltration has fluoro-gas.
The beneficial effects of the utility model are: the utility model has better bending resistance and less bending loss than traditional same type optical fiber, and with G.652D have better compatibility, and method for making is simple.
Brief description of the drawings
In order to be illustrated more clearly in the technical scheme in the utility model embodiment, below the accompanying drawing of required use during embodiment is described is briefly described, apparently, accompanying drawing in the following describes is only embodiment more of the present utility model, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing, wherein:
Fig. 1 is optical fiber structure schematic diagram G.657;
Fig. 2 is three kinds of Refractive Index Profile o sections and light field concentration degree figure;
Fig. 3 is the refractive index profile figure of a kind of bend-insensitive single-mode optical fiber one preferred embodiment of the utility model;
Fig. 4 is the structural representation of a kind of bend-insensitive single-mode optical fiber one preferred embodiment of the utility model;
Fig. 5 makes the SiO that mixes the sagging covering of fluorine refractive index in bend-insensitive single-mode optical fiber shown in Fig. 4
2the OVD process schematic representation of base tube;
Fig. 6 be shown in Fig. 4, in bend-insensitive single-mode optical fiber, mix fluorine cladding mix fluorine process schematic representation;
Fig. 7 deposits SiO mixing on fluorine cladding in bend-insensitive single-mode optical fiber shown in Fig. 4
2the OVD process schematic representation of surrounding layer;
In accompanying drawing, the mark of each parts is as follows: 1, plug, 2, mix the fluorine refractive index covering that sink, 3, SiO
2surrounding layer, 4, target rod, 5, SiO
2porous base tube, 6, torch, 7, fluoro-gas, 8, heating furnace.
Embodiment
To the technical scheme in the utility model embodiment be clearly and completely described below, obviously, described embodiment is only a part of embodiment of the present utility model, instead of whole embodiment.Based on the embodiment in the utility model, those of ordinary skill in the art are not making all other embodiment that obtain under creative work prerequisite, all belong to the scope of the utility model protection.
Refer to Fig. 1 to Fig. 6, the utility model embodiment comprises:
A kind of bend-insensitive single-mode optical fiber, as shown in Figure 4, comprising: fibre core and covering, and fiber core refractive index is poor is, wherein, is fiber core refractive index, is covering basal plane refractive index; Covering outside fibre core is followed successively by inner cladding from inside to outside, mix fluorine refractive index sink covering 2 and surrounding layer 3, in clad region, mixes the fluorine refractive index cladding index of sinking poor, wherein, and for mixing the fluorine refractive index covering that sink.
Plug 1 comprises fibre core and inner cladding part, and described core diameter is 8.2 μ m, and described cladding diameter is 125 μ m, and mixing sagging covering 2 inside radiuss of fluorine refractive index is 18 μ m, and mixing sagging covering 2 external radiuss of fluorine refractive index is 40 μ m.
The described sagging covering 2 of fluorine refractive index of mixing comprises SiO
2antipriming pipe, at described SiO
2in antipriming pipe, infiltration has fluoro-gas, forms sagging ramp type index distribution.
The utility model is the sagging cladding index profile fiber of a kind of circular groove shape of particular design, as shown in Figure 3.The circular groove shape cladding index profile fiber (trench – assisted fiber) that sink: this type optical fiber arrange in clad region with the poor larger circular groove shape refractive index bogging down area of cladding index, can improve the concentration degree (confinement) of light field at fibre core, as shown in Figure 2.From its refractive index profile, here there are two leaded light interfaces, one is fibre core-covering interface, fiber core refractive index is greater than cladding index, formation can realize the leaded light interface of total internal reflection, because the basic mode light intensity in single-mode fiber is gaussian shaped profile, so the main leaded light interface that this interface is optical fiber is limited in most luminous powers of light field in fibre core.Another is the inner boundary of the sagging covering of circular groove shape and covering, and here, cladding index is greater than the sagging cladding index of circular groove shape of mixing fluorine, has formed second the leaded light interface that can realize total internal reflection.This interface is the light field tail field of HE11 basic mode in restricted simple module optical fiber effectively, reduces mode field diameter.Especially in the time of fibre-optical bending, the circular groove shape covering that sink has formed a barrier that hinders tail field effusion optical fiber it can hinder tail field effusion fibre cladding effectively, thereby reduces widely bending loss.In addition, at the outer boundary of the sagging covering of circular groove shape and covering, here, the sagging cladding index of circular groove shape is less than cladding index, thereby has formed refractive power interface.On this interface, a part of light is reflected back, and a part of light is refracted away, causes loss.And in bend insensitive fiber of the present utility model, as shown in Figure 3, there is a leaded light interface in sagging ramp type index distribution district, its interfacial refraction rate from inside to outside, from big to small, forms leaded light interface.Due to the existence at this interface, improve the concentration degree of field, improve bending property; In addition, in sagging ramp type index distribution, the obvious refractive power face of neither one (its interfacial refraction rate from inside to outside, from small to large), thus the light loss of having avoided light intensity tail field effusion refractive power face to cause.Due to this special refractive index profile structure, there is better bending resistance and less bending loss at bend-insensitive single-mode optical fiber of the present utility model than traditional same type optical fiber, and with G.652D have better compatibility.
The utility model has better bending resistance and less bending loss than traditional same type optical fiber, and with G.652D have better compatibility, and method for making is simple.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model description to do; or be directly or indirectly used in other relevant technical field, be all in like manner included in scope of patent protection of the present utility model.
Claims (5)
1. a bend-insensitive single-mode optical fiber, is characterized in that, comprising: fibre core and covering, fiber core refractive index is poor is
, wherein,
for fiber core refractive index,
for covering basal plane refractive index; Covering outside fibre core is followed successively by inner cladding from inside to outside, mix fluorine refractive index sink covering and surrounding layer, in clad region, mixes the fluorine refractive index cladding index of sinking poor
, wherein,
for mixing the sagging covering of fluorine refractive index.
2. bend-insensitive single-mode optical fiber according to claim 1, is characterized in that, described core diameter is 8 μ m ~ 8.5 μ m.
3. bend-insensitive single-mode optical fiber according to claim 1, is characterized in that, described cladding diameter is 121 μ m ~ 128 μ m.
4. bend-insensitive single-mode optical fiber according to claim 1, is characterized in that, mixing the sagging covering inside radius of fluorine refractive index is 16 μ m ~ 20 μ m, and mixing the sagging covering external radius of fluorine refractive index is 37 μ m ~ 43 μ m.
5. bend-insensitive single-mode optical fiber according to claim 1, is characterized in that, the described sagging covering of fluorine refractive index of mixing comprises SiO
2porous base tube, at described SiO
2in porous base tube, infiltration has fluoro-gas.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420149682.8U CN203811839U (en) | 2014-03-31 | 2014-03-31 | Bending insensitive single-mode optical fiber |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420149682.8U CN203811839U (en) | 2014-03-31 | 2014-03-31 | Bending insensitive single-mode optical fiber |
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| CN201420149682.8U Expired - Fee Related CN203811839U (en) | 2014-03-31 | 2014-03-31 | Bending insensitive single-mode optical fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049299A (en) * | 2014-03-31 | 2014-09-17 | 江苏科信光电科技有限公司 | Bending-insensitive single mode fiber and manufacturing method thereof |
| CN113671623A (en) * | 2021-08-23 | 2021-11-19 | 杭州金星通光纤科技有限公司 | Single-mode optical fiber and manufacturing method thereof |
| CN116594100A (en) * | 2023-07-14 | 2023-08-15 | 江苏永鼎股份有限公司 | Bending insensitive optical fiber and manufacturing method thereof |
-
2014
- 2014-03-31 CN CN201420149682.8U patent/CN203811839U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104049299A (en) * | 2014-03-31 | 2014-09-17 | 江苏科信光电科技有限公司 | Bending-insensitive single mode fiber and manufacturing method thereof |
| CN113671623A (en) * | 2021-08-23 | 2021-11-19 | 杭州金星通光纤科技有限公司 | Single-mode optical fiber and manufacturing method thereof |
| CN113671623B (en) * | 2021-08-23 | 2023-08-22 | 杭州金星通光纤科技有限公司 | Single-mode optical fiber and manufacturing method thereof |
| CN116594100A (en) * | 2023-07-14 | 2023-08-15 | 江苏永鼎股份有限公司 | Bending insensitive optical fiber and manufacturing method thereof |
| CN116594100B (en) * | 2023-07-14 | 2023-10-20 | 江苏永鼎股份有限公司 | Bending insensitive optical fiber and manufacturing method thereof |
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Granted publication date: 20140903 |