CN103995314A - Bending insensitive single mode fiber and production technology thereof - Google Patents
Bending insensitive single mode fiber and production technology thereof Download PDFInfo
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- CN103995314A CN103995314A CN201410264646.0A CN201410264646A CN103995314A CN 103995314 A CN103995314 A CN 103995314A CN 201410264646 A CN201410264646 A CN 201410264646A CN 103995314 A CN103995314 A CN 103995314A
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Abstract
The invention discloses a bending insensitive single mode fiber. The fiber comprises a fiber core, inner cladding, subsidence cladding and outer cladding. The refractive index of the fiber core is n1, the refractive index of the inner cladding is n2, the refractive index of the subsidence cladding is n4, the subsidence cladding of the outer cladding is n3, the refractive index n1 remains unchanged along with increasing of the radius of the fiber core, the refractive index n2 remains unchanged along with increasing of the radius of the inner cladding, the refractive index n4 of the subsidence cladding is increased along with increasing of the radius until the refractive index n4 of the subsidence cladding is the same as the refractive index n3 of the outer cladding, n1>n2>n3>n4, n4 is increased along with increasing of the radius, no obvious refraction face exists, the refractive index of the interface is progressively increased from interior to exterior, and therefore optical loss due to the fact that a light intensity tail field is exposed out of the refraction face is avoided. Therefore, compared with a traditional similar optical fiber, the bending insensitive single mode fiber has the better bending resistance performance and the smaller bending loss and has the better compatibility with the G.652D.
Description
Technical field
The present invention relates to optical cable field, particularly a kind of bend-insensitive single-mode optical fiber and production technology thereof.
Background technology
Along with Access Network and FTTH development, for optical fiber, new requirement is also proposed.G.652 optical fiber traditional, a large amount of uses 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.
The HE transmitting in single-mode fiber
11the light field of mould in straight optical fiber is the symmetrical Gaussian distribution centered by axis.When 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.When 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 be over 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, invariably to take the concentration degree improving be the starting point in the design of various novel G.657 optical fiber.
At present, G.657 the structure of optical fiber probably can be divided following a few class:
(1) little doped core optical fiber (small core fiber); Be in the G.652 optical fiber of routine, reduce core diameter, to reduce mode field diameter, improve bending property.
(2) depressed cladding index distribution optical fiber (depressed cladding fiber); By at SiO
2in covering, mix F and form umbilicate type refractive index covering, to improve the concentration degree of field, improve bending property.
(3) the circular groove shape cladding index profile fiber (trench – assisted fiber) that sink: this type optical fiber in clad region, arrange with the poor larger circular groove shape refractive index bogging down area of cladding index, can improve light field in the concentration degree (confinement) of fibre core.
(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, when bending, not only loss is low, and bending stress is also much smaller than solid core fibres.But PCF cannot be compatible with standard fiber, can not with the mutual welding of standard fiber.Large-scale production is also quite difficult.
(5) stochastic distribution micropore cladded-fiber (nanoStructures fiber); This kind of optical fiber is comprised of with the covering that is provided with the nanometer air micropore of annular stochastic distribution the fibre core of mixing germanium.From optical effect, say, 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 that the physics mode that adopts is different, 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 physical arrangement is different, 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.This compares with the sagging cladding index profile fiber of circular groove shape, and its wall effect to light field tail field is much better than.
Above-mentioned first three type optical fiber all can be made of traditional optical wand gas-phase deposition, and is the counter-bending best results of the sagging cladding index profile fiber of circular groove shape with the 3rd class.Rear two type optical fibers need combine to make by gentle bubble moulding process with traditional gas-phase deposition, and technique is quite complicated.
Summary of the invention
The object of this invention is to provide a kind of have better bending resistance and less bending loss bend-insensitive single-mode optical fiber.
For solving the problems of the technologies described above, the present invention adopts following technical scheme: a kind of bend-insensitive single-mode optical fiber, it comprises fibre core, covering, described covering comprises the inner cladding that is coated on described fibre core, is coated on sagging covering and surrounding layer on described inner cladding, it is characterized in that: the refractive index of described fibre core is n
1, the refractive index of described inner cladding is n
2, the refractive index of described sagging covering is n
4, the refractive index of surrounding layer is n
3. described refractive index n
1with described fiber core radius increase, remain unchanged, the refractive index n of described inner cladding
2radius increase with described inner cladding remains unchanged, the refractive index n of described sagging covering
4with radius, increase, until with the refractive index n of surrounding layer
3identical, refractive index n
1> refractive index n
2> refractive index n
3> refractive index n
4, and
The radius of described fibre core is 4～5um.
Optimize, the radius of described inner cladding is 11～13um.
Optimize, the radius of described sagging covering is 17～19um.
Optimize the refractive index n of described sagging covering
4be linear increment to n
3.
Optimize, described covering also comprises surrounding layer, and the diameter of described surrounding layer is 125um.
The present invention also provides a kind of production technology of bend-insensitive single-mode optical fiber, and it comprises the following steps:
(1) by VAD legal system, make fibre core and inner cladding
A. base rod is fixed on the fixture of reaction vessel top;
B. utilize two torches to heat base rod, torch position is fixed, and the body of ventilating is silicon dioxide, germanium dioxide, hydrogen and oxygen, and one for depositing fibre core, and another is for depositing formation inner cladding;
When c. base rod rotates with fixture, move from the bottom to top, and depositional plane remains at certain position;
D. remove the prefabricated rods that base clavate becomes hollow;
E. the prefabricated rods of hollow forms through high temperature dehydration, sintering the rock quartz core rod of carrying out;
(2) rock quartz core rod is extended with surface erosion and washed
A. rock quartz core rod is clamped between the added and undercarriage of vertical glass work lathe;
B. utilize oxyhydrogen flame torch to heat rock quartz core rod, oxyhydrogen flame torch at the uniform velocity moves from bottom to top along rock quartz core rod, and undercarriage moves down simultaneously;
C. rock quartz core rod is with the moving down and be elongated of undercarriage, until rock quartz core rod reaches specified diameter and tolerance thereof;
D. rock quartz core rod is lost and washed, remove residual OH ion;
(3) by OVD method, make the cladding that sink
A. on major diameter target rod, utilize OVD method deposition SiO
2antipriming pipe;
B. the antipriming pipe of making is put into heating furnace and heat, in antipriming pipe, lead to fluoro-gas simultaneously, make fluoro-gas mind-set SiO from pipe
2the radial infiltration of antipriming pipe, thus sagging ramp type index distribution formed, at antipriming pipe periphery helium injection gas and chlorine, be used for drying and dehydrating simultaneously;
C. last formation can be stretched and fluorine-containing sagging cladding;
(4) at sagging cladding external sediment SiO
2surrounding layer
A. will sink cladding as plug, and adopt VOD method to deposit on its outer peripheral face and form porous body surrounding layer;
(5) rock quartz core rod and sagging cladding are fired into one
A. rock quartz core rod is inserted in the cladding that sink;
B. in heating furnace, heat, helium injection gas and chlorine carry out drying and dehydrating simultaneously, in the high temperature sintering stage, porous body surrounding layer is in sintering the process of fine and close glass into, having one radial inside power to be added to mixes on fluorine inner cladding glass tube, this power further makes inwardly radial being pressed on plug of inner cladding glass tube, thereby makes three be fused into an integral prefabricated rod;
(6) drawing optical fibers
A. above-mentioned preform is drawn into single-mode fiber in wire-drawer-tower.
Optimize, in step (1), when two torches heat base rod, need, to the logical air purifying in reaction vessel, utilize exhaust apparatus to stabilize the flame.
Optimize, in step (1), reaction vessel is outside equipped with pyrometer temperature in reaction vessel is monitored in real time.
Optimize, in step (2), rock quartz core rod lose while washing, can adopt the erosion of isothermal plasma to wash also can to adopt to spray hydrofluorite and lose and wash.
Optimize, in step (3), fluoro-gas can be SiF
4, CF
4or C
2f
6.
Beneficial effect of the present invention is: in the present invention, and refractive index n
1> refractive index n
2> refractive index n
3> refractive index n
4, at fibre core and inner cladding interface, form the leaded light interface that can realize total internal reflection, so the main leaded light interface that this interface is optical fiber is limited in most luminous powers of light field in fibre core; Inner cladding refractive index is greater than sagging cladding index, and refringence is very large, therefore its light conductivity is splendid, has further limited the expansion of luminous power, effectively reduces mode field diameter, has just improved the concentration degree of field, has reduced bending loss; Sagging cladding index is during ramp type distributes, 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.Therefore the bend-insensitive single-mode optical fiber of invention has better bending resistance and less bending loss than traditional same type optical fiber, and with G.652D have better compatibility.
Accompanying drawing explanation
Accompanying drawing 1 is the structural representation of bend-insensitive single-mode optical fiber of the present invention;
The refractive index profile figure that accompanying drawing 2 is this bend-insensitive single-mode optical fiber;
The process schematic representation that accompanying drawing 3 is step 1;
The process schematic representation that accompanying drawing 4,5 is step 3;
The process schematic representation that accompanying drawing 6 is step 4;
The process schematic representation that accompanying drawing 7 is step 5;
In accompanying drawing: 1, fibre core; 2, inner cladding; 3, sagging covering; 4, surrounding layer.
Embodiment
Below in conjunction with embodiment shown in the drawings, the present invention is described in detail below:
As shown in Figure 1, this bend-insensitive single-mode optical fiber comprises fibre core 1, covering, and described covering comprises the inner cladding 2 that is coated on described fibre core 1, be coated on sagging covering 3 on described inner cladding 2, be coated on the surrounding layer 4 sinking on covering 3.
As shown in Figure 2, the refractive index of described fibre core 1 is n
1, the refractive index of described inner cladding 2 is n
2, the refractive index of described sagging covering 3 is n
4, the refractive index of described surrounding layer is n
3. described refractive index n
1with described fibre core 1 radius increase, remain unchanged, described refractive index n
2radius increase with described inner cladding 2 remains unchanged, described refractive index n
3with the increase of described surrounding layer radius, remain unchanged, the refractive index n of described sagging covering 3
4with radius, increase, until with the refractive index of surrounding layer be n
3identical, refractive index n
1> refractive index n
2> refractive index n
3> refractive index n
4, and
The radius of described fibre core 1 is 4～5um, and the radius of described inner cladding 2 is 11～13um, and the radius of described sagging covering 3 is 17～19um, in the present embodiment, fibre core 1 is got 4um, and inner cladding 2 radiuses are 12um, the radius of sagging covering 3 is 18um, and the diameter of described surrounding layer 4 is 125um.The refractive index n of described sagging covering 3
4be linear increment to n
3.Due to refractive index n
1> refractive index n
2> refractive index n
3> refractive index n
4, at fibre core and inner cladding interface, form the leaded light interface that can realize total internal reflection, so the main leaded light interface that this interface is optical fiber is limited in most luminous powers of light field in fibre core; Inner cladding refractive index is greater than sagging cladding index, and refringence is very large, therefore its light conductivity is splendid, has further limited the expansion of luminous power, effectively reduces mode field diameter, has just improved the concentration degree of field, has reduced bending loss; Sagging cladding index is during ramp type distributes, 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.Therefore the bend-insensitive single-mode optical fiber of invention has better bending resistance and less bending loss than traditional same type optical fiber, and with G.652D have better compatibility.
The production technology of above-mentioned bend-insensitive single-mode optical fiber comprises the following steps:
(1) by VAD legal system, make fibre core and inner cladding
A. base rod is fixed on the fixture of reaction vessel top;
B. utilize two torches to heat base rod, torch position is fixed, one for depositing fibre core, another is for depositing formation inner cladding, wherein when two torches heat base rod, need utilize exhaust apparatus to stabilize the flame to the logical air purifying in reaction vessel, and reaction vessel be outside equipped with pyrometer temperature in reaction vessel is monitored in real time.
When c. base rod rotates with fixture, move from the bottom to top, and depositional plane remains at certain position;
D. remove the prefabricated rods that base clavate becomes hollow;
E. the prefabricated rods of hollow forms through high temperature dehydration, sintering the rock quartz core rod of carrying out;
As shown in Figure 3, the key of this step is strictly to control process conditions, comprises accurate control material flow, the flow of combustion gas, flame temperature, condensate surface temperature and rotational speed, and the position of lithosomic body end, so just can reach and produce uniform and stable prefabricated rods parent.The minor fluctuations of lithosomic body deposition end position will cause the variation of parent external diameter and refractive index profile, and therefore, the position deviation of deposition end should be controlled in the precision of 50 μ m.This positioning signal that can provide by video camera is controlled.
(2) rock quartz core rod is extended with surface erosion and washed
A. rock quartz core rod is clamped between the added and undercarriage of vertical glass work lathe;
B. utilize oxyhydrogen flame torch to heat rock quartz core rod, oxyhydrogen flame torch at the uniform velocity moves from bottom to top along rock quartz core rod, and undercarriage moves down simultaneously;
C. rock quartz core rod, with the moving down and be elongated of undercarriage, until rock quartz core rod reaches specified diameter and tolerance thereof, and has better symmetry;
D. rock quartz core rod is lost and washed, remove residual OH ion, rock quartz core rod is lost while washing, can adopt the erosion of isothermal plasma to wash also can to adopt spray hydrofluorite to lose and wash;
(3) by OVD method, make the cladding that sink
A. on major diameter target rod, utilize OVD method deposition SiO
2antipriming pipe, as shown in Figure 4,
B. the antipriming pipe of making is put into heating furnace and heat, in antipriming pipe, lead to fluoro-gas simultaneously, make fluoro-gas mind-set SiO from pipe
2the radial infiltration of antipriming pipe, thus sagging ramp type index distribution formed, at antipriming pipe periphery helium injection gas and chlorine, be used for drying and dehydrating, as shown in Figure 5 simultaneously;
C. last formation can be stretched and fluorine-containing sagging cladding, and fluoro-gas can be SiF
4, CF
4or C
2f
6;
(4) at sagging cladding external sediment SiO
2surrounding layer
A. will sink cladding as plug, and adopt VOD method to deposit on its outer peripheral face and form porous body surrounding layer, as shown in Figure 6;
(5) rock quartz core rod and sagging cladding are fired into one
A. rock quartz core rod is inserted in the cladding that sink, as shown in Figure 7;
B. in heating furnace, heat, helium injection gas and chlorine carry out drying and dehydrating simultaneously, in the high temperature sintering stage, porous body surrounding layer is in sintering the process of fine and close glass into, having one radial inside power to be added to mixes on fluorine inner cladding glass tube, this power further makes inwardly radial being pressed on plug of inner cladding glass tube, thereby makes three be fused into an integral prefabricated rod;
(6) drawing optical fibers
A. above-mentioned preform is drawn into single-mode fiber in wire-drawer-tower.
Above-described embodiment is only explanation technical conceive of the present invention and feature, and its object is to allow person skilled in the art can understand content of the present invention and implement according to this, can not limit the scope of the invention with this.All equivalences that spirit is done according to the present invention change or modify, within all should being encompassed in protection scope of the present invention.
Claims (10)
1. a bend-insensitive single-mode optical fiber, it comprises fibre core (1), covering, described covering comprises the inner cladding (2) that is coated on described fibre core (1), is coated on sagging covering (3) and surrounding layer (4) on described inner cladding (2), it is characterized in that: the refractive index of described fibre core (1) is n
1, the refractive index of described inner cladding (2) is n
2, the refractive index of described sagging covering (3) is n
4, the refractive index of surrounding layer (4) is n
3. described refractive index n
1with described fibre core (1) radius increase, remain unchanged, the refractive index n of described inner cladding (2)
2radius increase with described inner cladding (2) remains unchanged, the refractive index n of described sagging covering (3)
4with radius, increase, until with the refractive index n of surrounding layer (4)
3identical, refractive index n
1> refractive index n
2> refractive index n
3> refractive index n
4, and
The radius of described fibre core (1) is 4～5um.
2. bend-insensitive single-mode optical fiber according to claim 1, is characterized in that: the radius of described inner cladding (2) is 11～13um.
3. bend-insensitive single-mode optical fiber according to claim 1, is characterized in that: the radius of described sagging covering (3) is 17～19um.
4. bend-insensitive single-mode optical fiber according to claim 1, is characterized in that: the refractive index n of described sagging covering (3)
4be linear increment to n
3.
5. bend-insensitive single-mode optical fiber according to claim 1, is characterized in that: the diameter of described surrounding layer (4) is 125um.
6. a technique of producing arbitrary bend-insensitive single-mode optical fiber in claim 1～5, is characterized in that, it comprises the following steps:
(1) by VAD legal system, make fibre core and inner cladding
A. base rod is fixed on the fixture of reaction vessel top;
B. utilize two torches to heat base rod, torch position is fixed, and one for depositing fibre core, and another is for depositing formation inner cladding;
When c. base rod rotates with fixture, move from the bottom to top, and depositional plane remains at certain position;
D. remove the prefabricated rods that base clavate becomes hollow;
E. the prefabricated rods of hollow forms through high temperature dehydration, sintering the rock quartz core rod of carrying out;
(2) rock quartz core rod is extended with surface erosion and washed
A. rock quartz core rod is clamped between the added and undercarriage of vertical glass work lathe;
B. utilize oxyhydrogen flame torch to heat rock quartz core rod, oxyhydrogen flame torch at the uniform velocity moves from bottom to top along rock quartz core rod, and undercarriage moves down simultaneously;
C. rock quartz core rod is with the moving down and be elongated of undercarriage, until rock quartz core rod reaches specified diameter and tolerance thereof;
D. rock quartz core rod is lost and washed, remove residual OH ion;
(3) by OVD method, make the cladding that sink
A. on major diameter target rod, utilize OVD method deposition SiO
2antipriming pipe;
B. the antipriming pipe of making is put into heating furnace and heat, in antipriming pipe, lead to fluoro-gas simultaneously, make fluoro-gas mind-set SiO from pipe
2the radial infiltration of antipriming pipe, thus sagging ramp type index distribution formed, at antipriming pipe periphery helium injection gas and chlorine, be used for drying and dehydrating simultaneously;
C. last formation can be stretched and fluorine-containing sagging cladding;
(4) at sagging cladding external sediment SiO
2surrounding layer;
A. will sink cladding as plug, and adopt VOD method to deposit on its outer peripheral face and form porous body surrounding layer;
(5) rock quartz core rod and sagging cladding are fired into one
A. rock quartz core rod is inserted in the cladding that sink;
B. in heating furnace, heat, helium injection gas and chlorine carry out drying and dehydrating simultaneously, in the high temperature sintering stage, porous body surrounding layer is in sintering the process of fine and close glass into, having one radial inside power to be added to mixes on fluorine inner cladding glass tube, this power further makes inwardly radial being pressed on plug of inner cladding glass tube, thereby makes three be fused into an integral prefabricated rod;
(6) drawing optical fibers
A. above-mentioned preform is drawn into single-mode fiber in wire-drawer-tower.
7. the technique of production bend-insensitive single-mode optical fiber according to claim 6, is characterized in that: in step (1), when two torches heat base rod, need, to the logical air purifying in reaction vessel, utilize exhaust apparatus to stabilize the flame.
8. the technique of production bend-insensitive single-mode optical fiber according to claim 6, is characterized in that: in step (1), reaction vessel is outside equipped with pyrometer temperature in reaction vessel is monitored in real time.
9. the technique of production bend-insensitive single-mode optical fiber according to claim 6, is characterized in that: in step (2), rock quartz core rod is lost while washing, can adopt the erosion of isothermal plasma to wash also can to adopt spray hydrofluorite to lose and wash.
10. the technique of production bend-insensitive single-mode optical fiber according to claim 6, is characterized in that: in step (3), fluoro-gas can be SiF
4, CF
4or C
2f
6.
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| WO2016173253A1 (en) * | 2015-04-28 | 2016-11-03 | 长飞光纤光缆股份有限公司 | Ultralow-attenuation bend-insensitive single-mode optical fibre |
| WO2017036030A1 (en) * | 2015-08-31 | 2017-03-09 | 中天科技光纤有限公司 | Bend-resistant fine optical fiber and manufacturing method thereof |
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| CN107632338A (en) * | 2017-10-31 | 2018-01-26 | 江苏亨通光导新材料有限公司 | Counter-bending single-mode fiber and preparation method thereof |
| CN110927862A (en) * | 2019-12-10 | 2020-03-27 | 普天线缆集团有限公司 | Novel bending insensitive G657 single mode fiber and manufacturing method thereof |
| CN111399113A (en) * | 2020-04-24 | 2020-07-10 | 长飞光纤光缆股份有限公司 | Small-outer-diameter bending insensitive single-mode optical fiber |
| CN111781673A (en) * | 2020-07-08 | 2020-10-16 | 普天线缆集团有限公司 | Novel ultra-low loss G.654E optical fiber and manufacturing method thereof |
| CN112764155A (en) * | 2021-01-12 | 2021-05-07 | 烽火通信科技股份有限公司 | Hard cladding rare earth-doped optical fiber and preparation method thereof |
| CN115124231A (en) * | 2022-06-28 | 2022-09-30 | 华能(泰安)光电科技有限公司 | Air-clad anti-bending multi-core optical fiber and manufacturing method thereof |
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| KR102019579B1 (en) | 2015-04-28 | 2019-09-06 | 양쯔 옵티컬 파이버 앤드 케이블 조인트 스톡 리미티드 컴퍼니 | Ultra-low Attenuation Flexural Enhanced Singlemode Fiber |
| KR102106677B1 (en) | 2015-04-28 | 2020-05-04 | 양쯔 옵티컬 파이버 앤드 케이블 조인트 스톡 리미티드 컴퍼니 | Ultra-low attenuation single-mode fiber |
| US10514495B2 (en) | 2015-04-28 | 2019-12-24 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Single-mode fiber with ultra low attenuation |
| KR20170104624A (en) * | 2015-04-28 | 2017-09-15 | 양쯔 옵티컬 파이버 앤드 케이블 조인트 스톡 리미티드 컴퍼니 | Ultra-low attenuation single mode fiber |
| WO2016173253A1 (en) * | 2015-04-28 | 2016-11-03 | 长飞光纤光缆股份有限公司 | Ultralow-attenuation bend-insensitive single-mode optical fibre |
| US10018779B2 (en) | 2015-04-28 | 2018-07-10 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Bending-insensitive single-mode fiber with ultra low attenuation |
| KR20170104625A (en) * | 2015-04-28 | 2017-09-15 | 양쯔 옵티컬 파이버 앤드 케이블 조인트 스톡 리미티드 컴퍼니 | Ultra-low damping bend reinforced single mode fiber |
| WO2017036030A1 (en) * | 2015-08-31 | 2017-03-09 | 中天科技光纤有限公司 | Bend-resistant fine optical fiber and manufacturing method thereof |
| CN105204110A (en) * | 2015-10-31 | 2015-12-30 | 长飞光纤光缆股份有限公司 | Few-mode fiber with relatively low different group delay (DGD) |
| CN105204110B (en) * | 2015-10-31 | 2018-06-12 | 长飞光纤光缆股份有限公司 | A kind of less fundamental mode optical fibre with relatively low differential mode group delay |
| CN106680929A (en) * | 2016-12-27 | 2017-05-17 | 湖北工业大学 | Automatic optical fiber hydrogen loading device and hydrogen loading method |
| CN106680929B (en) * | 2016-12-27 | 2019-01-29 | 湖北工业大学 | A kind of automated fiber optic carries hydrogen production device and carries hydrogen methods |
| CN107632338A (en) * | 2017-10-31 | 2018-01-26 | 江苏亨通光导新材料有限公司 | Counter-bending single-mode fiber and preparation method thereof |
| CN107632338B (en) * | 2017-10-31 | 2020-06-16 | 江苏亨通光导新材料有限公司 | Bending-resistant single-mode optical fiber and manufacturing method thereof |
| CN110927862A (en) * | 2019-12-10 | 2020-03-27 | 普天线缆集团有限公司 | Novel bending insensitive G657 single mode fiber and manufacturing method thereof |
| CN111399113A (en) * | 2020-04-24 | 2020-07-10 | 长飞光纤光缆股份有限公司 | Small-outer-diameter bending insensitive single-mode optical fiber |
| CN111781673A (en) * | 2020-07-08 | 2020-10-16 | 普天线缆集团有限公司 | Novel ultra-low loss G.654E optical fiber and manufacturing method thereof |
| CN111781673B (en) * | 2020-07-08 | 2022-06-28 | 普天线缆集团有限公司 | Novel ultra-low loss G.654E optical fiber and manufacturing method thereof |
| CN112764155A (en) * | 2021-01-12 | 2021-05-07 | 烽火通信科技股份有限公司 | Hard cladding rare earth-doped optical fiber and preparation method thereof |
| CN115124231A (en) * | 2022-06-28 | 2022-09-30 | 华能(泰安)光电科技有限公司 | Air-clad anti-bending multi-core optical fiber and manufacturing method thereof |
| CN115124231B (en) * | 2022-06-28 | 2023-11-24 | 华能(泰安)光电科技有限公司 | Air-clad anti-bending multi-core optical fiber and manufacturing method thereof |
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