CN104316993A - Energy transmission optical fiber with large core diameter - Google Patents
Energy transmission optical fiber with large core diameter Download PDFInfo
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- CN104316993A CN104316993A CN201410591146.8A CN201410591146A CN104316993A CN 104316993 A CN104316993 A CN 104316993A CN 201410591146 A CN201410591146 A CN 201410591146A CN 104316993 A CN104316993 A CN 104316993A
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- layer
- diameter
- optical fiber
- large core
- core diameter
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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
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode fibres
-
- 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
Abstract
The invention relates to an energy transmission optical fiber with a large core diameter. The energy transmission optical fiber comprises a core layer and a coating layer. The core layer is a pure silicon (SiO2) glass layer or a fluorine-doped (F) glass layer, the diameter of the core layer ranges from 400 micrometers to 620 micrometers, and the relative refractivity of the core layer delta1 ranges from -0.2 percent to 0 percent. The coating layer is divided into an inner coating layer body and an outer coating layer body, the inner coating layer body is the fluorine-doped glass layer and surrounds the core layer tightly, the diameter D2 of the inner coating layer body ranges from 440 micrometers to 700 micrometers, the relative refractivity delta2 of the inner coating layer body ranges from -1.9 percent to -0.9 percent, the outer coating layer body is the pure silicon glass layer or the fluorine-doped glass layer, the diameter D3 of the outer coating layer body ranges from 500 micrometers to 760 micrometers, and the relative refractivity delta3 of the inner coating layer body ranges from -0.5 percent to 0 percent. The energy transmission optical fiber with the large core diameter has the good medium and high power laser transmission efficiency and the long-term use stability, thereby being applied to industrial laser. The energy transmission optical fiber with the large core diameter has high coupling efficiency and transmission efficiency, and the transmission efficiency of the fiber can reach more than 95 percent; laser with medium and high power reaching 600w can be transmitted through the fiber; and the fiber has good stability.
Description
Technical field
The present invention relates to the large core fiber of high-power energy in a kind of transmission, this optical fiber has high energy bidirectional flow and good transfer efficiency and transmission stability, belongs to technical field of optical fiber.
Background technology
For the single-mode fiber that core diameter is not more than 10 μm, the pure silicon core large core fiber that core diameter is greater than 200 μm is the good material for high-power energy in transmitting.Large core fiber has larger numerical aperture, larger core diameter, is very beneficial for coupling and the transmission of energy light.The material structure of pure silicon core makes optical fiber have higher energy bidirectional flow.In Chinese patent 201210221499.X, describe a kind of energy-transmission optic fibre for the field such as industry control, medical treatment, this fiber glass part is low hydroxyl high purity quartz, scribble the low-refraction coating that one deck has specific components proportioning on the surface of quartz, the advantage of this invention to reduce the production cost of energy-transmission optic fibre.In that patent, the transmission performance of this invention optical fiber under the condition of work of middle high power (>300w) is not described.Usually, the power that we think for the field such as industry control, medical treatment is the power of more than the 300w being less than commercial Application.
In Chinese patent 201310435892.3, describe a kind of sandwich layer and mix germanium and the large core diameter bend-insensitive multimode optical fiber with graded index profile, this optical fiber improves the bending resistance of optical fiber by the covering of depressed-index.In sandwich layer, the doping of germanium will change the material property of core material, and cause the reduction of laser damage threshold, this is high-power Laser energy transmission in being unfavorable for.In that patent, the optical fiber invented is mainly used in the power delivery of below 100w.
In Chinese patent 201210261813.7, describe a kind of polymer-clad fiber and manufacture method thereof, this polymer material is perfluor ether polymer.Also illustrate a kind of doubly clad optical fiber, the sandwich layer of this optical fiber is for mixing rare earth material, and the first covering is the quartz glass of refractive index lower than fibre core, and the second covering is perfluor ether polymer simultaneously.The feature of this invention is the perfluor ether polymer material forming covering, has high NA and stability.This patent the structural design of silica glass member is not described or to the effect of invention optical fiber describe.
General, adulterant can change the relative index of refraction of quartz glass.The adulterants such as germanium (Ge), chlorine (Cl), phosphorus (P) can make adulterate after quartz glass relative index of refraction on the occasion of, we are referred to as " positive adulterant ", and the adulterant such as fluorine (F), boron (B) can make the relative index of refraction of the quartz glass after adulterating be negative value, we are referred to as " negative adulterant ".If use one " positive adulterant " and one " negative adulterant " to adulterate to quartz glass simultaneously, then the relative index of refraction of the quartz glass after doping can be on the occasion of or negative value, or be 0.
Summary of the invention
Introduce content of the present invention for convenience, define following term:
Pure silicon material: absolutely not containing Ge or F, can Cl, P etc. be contained.
Mix fluorine material: absolutely not containing Ge, Cl, P etc. can be contained.
Refractive index profile: the relation in optical fiber between glass refraction and its radius.
Refractive index contrast:
n
iand n
0be respectively the refractive index of each corresponding part and the refractive index of pure silicon dioxide quartz glass.
Fiber numerical aperture NA value: NA=n
0* (Δ 1-Δ 2)
1/2, n
0for pure silicon dioxide (SiO
2) refractive index.
The contribution amount of fluorine (F): mix the relative index of refraction (Δ F) of fluorine (F) quartz glass relative to pure silicon dioxide quartz glass, represents with this and mixes fluorine (F) amount.
Technical matters to be solved by this invention is the deficiency that exists for aforesaid prior art and the large core diameter energy-transmission optic fibre of high power in providing a kind of transmission performance stable, and this optical fiber has high energy bidirectional flow, and transfer efficiency is high, stable performance.
The technical scheme that the problem that the present invention is the above-mentioned proposition of solution adopts is:
Comprise sandwich layer and covering, it is characterized in that described sandwich layer is pure silicon (SiO2) glassy layer or mixes fluorine (F) glassy layer, the diameter D1 of sandwich layer is 400 μm ~ 620 μm, the refractive index contrast Δ 1 of sandwich layer is-0.2% ~ 0%, described covering is divided into inner cladding and surrounding layer, closely around sandwich layer is inner cladding, inner cladding is for mixing fluorine glassy layer, the diameter D2 of inner cladding is 440 μm ~ 700 μm, the refractive index contrast Δ 2 of inner cladding is-1.9% ~-0.9%, surrounding layer is pure silicate glass layer or mixes fluorine glassy layer, the diameter D3 of surrounding layer is 500 μm ~ 760 μm, the relative index of refraction Δ 3 of surrounding layer is-0.5% ~ 0%.
By such scheme, the ratio D2/D1 of described inner cladding diameter and sandwich layer diameter is 1.1 ~ 1.3.
By such scheme, the ratio D3/D1 of described outer cladding diameter and sandwich layer diameter is 1.25 ~ 1.4.
By such scheme, the difference DELTA 1-Δ 2 of described sandwich layer refractive index contrast and inner cladding refractive index contrast is 0.9% ~ 1.7%.
By such scheme, the difference DELTA 1-Δ 3 of described sandwich layer refractive index contrast and surrounding layer refractive index contrast is 0% ~ 0.3%.
By such scheme, dope layer is coated with outside described optical fiber jacket, described dope layer is followed successively by inside courtyard layer and rustproof lacquer layer from inside to outside, and the difference D4-D3 of the diameter D4 of inside courtyard layer and the diameter D3 of surrounding layer is 20 μm ~ 70 μm, and (secant) modulus of inside courtyard layer is 1 ~ 300Mpa; The difference D5-D4 of the diameter D5 of rustproof lacquer layer and the diameter D4 of inside courtyard layer is 100 μm ~ 800 μm, and (secant) modulus of rustproof lacquer layer is 500 ~ 2000MPa.
By such scheme, described inside courtyard layer is the highest can tolerable temperature be 80 DEG C ~ 300 DEG C.
By such scheme, described rustproof lacquer layer is the highest can tolerable temperature be 80 DEG C ~ 300 DEG C.
By such scheme, described optical fiber screening intensity is 50kpsi.
By such scheme, optical fiber minimum bending radius is 180mm.
By such scheme, optical fiber is prepared as wire jumper after further processing process.
Beneficial effect of the present invention is: 1. pure silicon core or mix the core material of fluorine core, has very high laser energy damage threshold, be very suitable for the transmission of the laser energy of higher-wattage; 2. deeply mix the inner cladding of fluorine, make optical fiber have higher numerical aperture, be conducive to coupling and the transmission of laser energy; 3. surrounding layer is by mixing fluorine, its refractive index is reduced, and like this, the refractive index of sandwich layer is higher than the refractive index of surrounding layer, advantageously in laser energy is constrained in sandwich layer fractional transmission, also can stop power leakage to surrounding layer and dope layer in transmitting procedure simultaneously; 4. inside and outside, dual-coating has good resistance to elevated temperatures, in the process of Laser energy transmission, Partial Power inevitably leaks into surrounding layer even dope layer part, the temperature that the accumulation of energy can cause coating to bear raises, after coating is destroyed, the transmission performance of optical fiber can sharply worsen.High-temperature resistant coating better can bear the temperature of rising, ensures the transmission performance of optical fiber; 5. optical fiber of the present invention has higher coupling efficiency and transfer efficiency, and Optical Fiber Transmission efficiency can reach more than 95%; Optical fiber can transmit the middle high power laser light reaching 600w; Optical fiber has good stability, and under long-term work condition, the connector temperature of optical patchcord can remain on less than 45 DEG C, and transfer efficiency is stablized.
Accompanying drawing explanation
Fig. 1 is the optical fiber structure schematic diagram of one embodiment of the present of invention.Wherein, 01 is sandwich layer, and 02 is inner cladding, and 03 is surrounding layer, and 04 is interlayer coatings, and 05 is outer layer coating.
Fig. 2 is the fibre-optic waveguide structural representation of one embodiment of the present of invention.
Fig. 3 and Fig. 4 is the test result of the Laser Transmission test of one embodiment of the present of invention.Fig. 3 is output power and the transfer efficiency of wire jumper, and Fig. 4 is the connector temperature variation of wire jumper.
Embodiment
Below in conjunction with specific embodiment, the present invention is further elaborated.
Large core fiber in the embodiment of the present invention comprises sandwich layer and covering, described sandwich layer 01 is for pure silicon (SiO2) glassy layer or mix fluorine (F) glassy layer, the diameter D1 of sandwich layer is 400 μm ~ 620 μm, the refractive index contrast Δ 1 of sandwich layer is-0.2% ~ 0%, described covering is divided into inner cladding 02 and surrounding layer 03, closely around sandwich layer is inner cladding, inner cladding is for mixing fluorine glassy layer, the diameter D2 of inner cladding is 440 μm ~ 700 μm, the refractive index contrast Δ 2 of inner cladding is-1.9% ~-0.9%, surrounding layer is pure silicate glass layer or mixes fluorine glassy layer, the diameter D3 of surrounding layer is 500 μm ~ 760 μm, the relative index of refraction Δ 3 of surrounding layer is-0.5% ~ 0%.Dope layer is coated with outside described optical fiber jacket, described dope layer is followed successively by inside courtyard layer 04 and rustproof lacquer layer 05 from inside to outside, the difference D4-D3 of the diameter D4 of inside courtyard layer and the diameter D3 of surrounding layer is 20 μm ~ 70 μm, and (secant) modulus of inside courtyard layer is 1 ~ 300Mpa; The difference D5-D4 of the diameter D5 of rustproof lacquer layer and the diameter D4 of inside courtyard layer is 100 μm ~ 800 μm, and (secant) modulus of rustproof lacquer layer is 500 ~ 2000MPa.
By the technical scheme of above-mentioned large core fiber, design in the parameter of the scope interior focusing fibre of its defined, and the plug manufacturing process such as PCVD technique, MCVD technique, OVD technique or the VAD technique known by us to manufacture plug according to the designing requirement of optical fiber, are completed the manufacture of whole prefabricated rods by over cladding process such as plasm outward spraying technique, sleeve pipe technique or OVD techniques.PCVD technique, plasm outward spraying technique carry out high concentration mix fluorine (F) time, there is certain advantage.
In the drawing process of optical fiber, optical fiber is by two-layer paint, and curing process is the techniques such as ultra-violet curing.
Draw the refractive index profile of optical fiber use NR-9200 equipment (EXFO) test.The major parameter of optical fiber is as shown in table 1.
Fiber end face is after milled processed, and assembly connector, is prepared into the optical patchcord of the types such as D80.Optical patchcord is tested on Laser Transmission platform.Laser instrument is Nd:YAG solid state laser, and operation wavelength is 1064nm.Optical patchcord, when carrying out Laser Transmission test, uses the connector temperature of thermopair on-line testing wire jumper, uses the output power of power meter on-line testing optical patchcord.Optimum configurations and the test result of laser instrument are as shown in table 2.
As can be seen from embodiment:
Sandwich layer diameter is larger, then be more conducive to the coupling of power, improves the transfer efficiency of optical fiber, as the comparison of embodiment 1 and embodiment 2.
It is more that inner cladding mixes fluorine, then the numerical aperture of optical fiber is higher, is conducive to the raising of the transmission performance of optical fiber, as the contrast of embodiment 2 and embodiment 3.
It is more that surrounding layer mixes fluorine, then be more conducive to power constraint to divide in core portion to transmit, and reduces power to the leakage of covering, improves transfer efficiency and the stability of optical fiber, as the contrast of embodiment 2 and embodiment 4.
Coating have higher can resistance to temperature, the transmission performance of optical fiber can be made more stable, as the contrast of embodiment 2 and embodiment 5.
Experiment shows, according to the optical fiber manufactured by technical scheme of the present invention, have good Laser Transmission performance, concrete is: optical fiber has higher coupling efficiency and transfer efficiency, and Optical Fiber Transmission efficiency can reach more than 95%; Optical fiber can transmit the middle high power laser light reaching 600w; Optical fiber has good stability, and under long-term work condition, the connector temperature of optical patchcord can remain on less than 45 DEG C, and transfer efficiency is stablized.
Table 1: the major parameter of optical fiber
Table 2: laser parameter is arranged and test transmission result
Claims (9)
1. a large core diameter energy-transmission optic fibre, comprise sandwich layer and covering, it is characterized in that described sandwich layer is pure silicate glass layer or mixes fluorine glassy layer, the diameter D1 of sandwich layer is 400 μm ~ 620 μm, the refractive index contrast Δ 1 of sandwich layer is-0.2% ~ 0%, described covering is divided into inner cladding and surrounding layer, closely around sandwich layer is inner cladding, inner cladding is for mixing fluorine glassy layer, the diameter D2 of inner cladding is 440 μm ~ 700 μm, the refractive index contrast Δ 2 of inner cladding is-1.9% ~-0.9%, surrounding layer is pure silicate glass layer or mixes fluorine glassy layer, the diameter D3 of surrounding layer is 500 μm ~ 760 μm, the relative index of refraction Δ 3 of surrounding layer is-0.5% ~ 0%.
2., by large core diameter energy-transmission optic fibre according to claim 1, it is characterized in that the ratio D2/D1 of described inner cladding diameter and sandwich layer diameter is 1.1 ~ 1.3.
3., by large core diameter energy-transmission optic fibre according to claim 2, it is characterized in that the ratio D3/D1 of described outer cladding diameter and sandwich layer diameter is 1.25 ~ 1.4.
4., by the large core diameter energy-transmission optic fibre described in claim 1 or 2, it is characterized in that the difference DELTA 1-Δ 2 of described sandwich layer refractive index contrast and inner cladding refractive index contrast is 0.9% ~ 1.7%.
5., by the large core diameter energy-transmission optic fibre described in claim 1 or 2, it is characterized in that the difference DELTA 1-Δ 3 of described sandwich layer refractive index contrast and surrounding layer refractive index contrast is 0% ~ 0.3%.
6. by the large core diameter energy-transmission optic fibre described in claim 1 or 2, it is characterized in that being coated with dope layer outside described optical fiber jacket, described dope layer is followed successively by inside courtyard layer and rustproof lacquer layer from inside to outside, the difference D4-D3 of the diameter D4 of inside courtyard layer and the diameter D3 of surrounding layer is 20 μm ~ 70 μm, and the modulus of inside courtyard layer is 1 ~ 300Mpa; The difference D5-D4 of the diameter D5 of rustproof lacquer layer and the diameter D4 of inside courtyard layer is 100 μm ~ 800 μm, and the modulus of rustproof lacquer layer is 500 ~ 2000MPa.
7. by large core diameter energy-transmission optic fibre according to claim 6, it is characterized in that described inside courtyard layer the highest can tolerable temperature be 80 DEG C ~ 300 DEG C; Described rustproof lacquer layer is the highest can tolerable temperature be 80 DEG C ~ 300 DEG C.
8., by the large core diameter energy-transmission optic fibre described in claim 1 or 2, it is characterized in that described optical fiber screening intensity is 50kpsi.
9., by the large core diameter energy-transmission optic fibre described in claim 1 or 2, it is characterized in that optical fiber minimum bending radius is 180mm.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849802A (en) * | 2015-05-09 | 2015-08-19 | 江苏法尔胜光电科技有限公司 | Filtering ring-structured large-core diameter energy transfer quartz optical fiber |
| CN106630652A (en) * | 2015-10-29 | 2017-05-10 | 上海亨通光电科技有限公司 | Optical fiber preform, preparation method and application thereof |
| CN110471139A (en) * | 2019-08-05 | 2019-11-19 | 上海瑞柯恩激光技术有限公司 | Optical fiber and its application method |
| CN114624812A (en) * | 2022-03-16 | 2022-06-14 | 江苏亨通光纤科技有限公司 | Multi-core energy transmission optical fiber and preparation method thereof |
| CN117008242A (en) * | 2023-08-16 | 2023-11-07 | 长飞光坊(武汉)科技有限公司 | Large-core-diameter active optical fiber and application thereof |
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| CN103777269A (en) * | 2014-01-15 | 2014-05-07 | 烽火通信科技股份有限公司 | High-temperature-resistance optical fiber |
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| CN101363941A (en) * | 2008-09-27 | 2009-02-11 | 长飞光纤光缆有限公司 | Novel plastic cladding optical fiber |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104849802A (en) * | 2015-05-09 | 2015-08-19 | 江苏法尔胜光电科技有限公司 | Filtering ring-structured large-core diameter energy transfer quartz optical fiber |
| CN106630652A (en) * | 2015-10-29 | 2017-05-10 | 上海亨通光电科技有限公司 | Optical fiber preform, preparation method and application thereof |
| CN110471139A (en) * | 2019-08-05 | 2019-11-19 | 上海瑞柯恩激光技术有限公司 | Optical fiber and its application method |
| CN114624812A (en) * | 2022-03-16 | 2022-06-14 | 江苏亨通光纤科技有限公司 | Multi-core energy transmission optical fiber and preparation method thereof |
| CN117008242A (en) * | 2023-08-16 | 2023-11-07 | 长飞光坊(武汉)科技有限公司 | Large-core-diameter active optical fiber and application thereof |
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