CN106646747B - The preparation method of photonic crystal fiber integration end cap - Google Patents
The preparation method of photonic crystal fiber integration end cap Download PDFInfo
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- CN106646747B CN106646747B CN201710000718.4A CN201710000718A CN106646747B CN 106646747 B CN106646747 B CN 106646747B CN 201710000718 A CN201710000718 A CN 201710000718A CN 106646747 B CN106646747 B CN 106646747B
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- optical fiber
- fiber
- photonic crystal
- end cap
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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
- G02B6/24—Coupling light guides
- G02B6/25—Preparing the ends of light guides for coupling, e.g. cutting
Abstract
A kind of preparation method of photonic crystal fiber integration end cap, using carbon dioxide laser, airport photonic crystal fiber is subjected to rotary heating according to certain revolving speed and heating power, that realizes airport uniformly synchronizes solidification of collapsing, further cut using optical fiber cutter, the end cap for obtaining different end plane angles meets application demand of the large mode area pcf in terms of full-optical-fiber laser and high power laser light.The invention avoids the problems that the fiber cut section out-of-flatness faced when external quartz glass end cap and photon crystal optical fiber fusion splicing leads to heat seal strength deficiency, can directly collapse the end cap being seamlessly connected on original photonic crystal fiber, convenient for subsequent processing application, while the laser activity of optical fiber is not influenced.
Description
Technical field
The present invention relates to optical fiber, especially a kind of preparation method of quartz glass photonic crystal fiber end cap.
Background technique
Photonic crystal fiber (Photonic crystal fiber, PCF), because it is with endless single mode transmission, mould field
The characteristics such as area is controllable, high non-linearity, excellent birefringence effect and high-NA, thus in optic communication, high power transmission, light
Fibre laser, super continuous spectrums etc. have wide application.Its distinctive air pore structure, so that it can not as conventional quartz
Optical fiber cut like that, welding.So must be handled using special process the end face PCF, such as welding end cap, a side
Face come improve high power conditions lower end surface due to temperature rise caused by pollution and facet damage；On the other hand the end PCF is improved
The antibody Monoclonal threshold value in face also lays the foundation for PCF all -fiber application.Due to the particularity of PCF production and structure, treatment process is difficult
Degree is big, spends height, several companies such as only NKT can be with the welding of the completion end cap of high quality in the world.The country is in photon
In terms of the end face processing of the preparation of crystal optical fibre and optical fiber and international most advanced level there are also larger gaps.
Traditional end caps are obtained using the technology of optics cold working, then will be processed using optical fiber splicer
Column end cap and optical fiber carry out welding.This technology is relatively easy in all solid state end caps of welding double clad, but for sky
For the photonic crystal fiber of air hole structure, since the presence of air pore structure leads to fiber cut and all extremely difficult processing of grinding,
Therefore it carries out always existing larger difficulty in terms of end cap welding.The photonic crystal fiber with end cap that NKT company releases in the world,
Its technology of preparing is to be completed end cap and optical fiber in 45° angle welding using carbon dioxide laser based on special fusion techniques,
Remain the air pore structure inside photonic crystal fiber.
It has not yet to see and photonic crystal fiber is directly carried out melting to collapse using carbon dioxide laser to prepare integrated end
The technology of preparing of cap.
Summary of the invention
The purpose of the present invention is to provide a kind of preparation methods of photonic crystal fiber integration end cap: using carbon dioxide
Large mode field airport photonic crystal fiber is carried out rotary heating according to certain revolving speed and heating power, realized empty by laser
Stomata uniformly synchronizes solidification of collapsing, and is further cut using optical fiber cutter, obtains the end cap of different end plane angles；This method
The treatment process of large mode field airport structure photonic crystal fiber end face is significantly improved, photonic crystal fiber integration is obtained
End cap greatly expands the application potential of photonic crystal fiber.It is simple and practical with operating method, low excellent of preparation cost
Point.
In order to achieve the above objectives, the technical solution below that we provide:
A kind of preparation method of photonic crystal fiber integration end cap, it is characterized in that this method includes the following steps:
1) taking an outer diameter is 400-600 microns of photonic crystal fiber, first handles optical fiber surface with analysis absolute alcohol, then will
The optical fiber is placed in standard fiber fixture, and the distance of position to the fiber end face of optical fiber clamping is 10cm；
2) the standard fiber fixture is placed in the fixture card slot of optical fiber splicer, the optical fiber is placed in optical fiber welding
In two V-grooves to pick, the distance between two V-grooves are set as 4cm；It is recessed along V-groove by homemade M shape V-groove cover board
Sunken direction depresses, the flat presser feet of the centre of the M shape V-groove cover board by the optical fiber be limited in flat presser feet with
Within the scope of the triangle of V-groove composition；
3) heat sealing machine parameter is arranged: laser is 10.6 microns of carbon dioxide laser, and laser heating power is 10W-20W；
Fiber spinning speed is 0.05-0.15 °/ms；Heating time is 9000-20000ms；
4) start heat sealing machine, emit laser, start timing, heating rotates while starting；Observe welding display screen, observation
Whether optical fiber rotates smoothly；If optical fiber is shaken, stop heating, cleaning V-groove and balance presser feet after repeat above step after
Continuous experiment；
5) reach the heating setpoint time, take out optical fiber and be placed in microscopically observation measurement, areas transparent of collapsing, region of collapsing
Length is 500-1000 microns；Collapse adjacent two airport in region end face length difference be no more than 10 microns；
6) region of collapsing for successful optical fiber of collapsing is placed under large-diameter fibre-optical cutter, on demand by fiber cut angle
Degree is set as 0-8 °, and the length i.e. length of end cap for retaining region of collapsing is 40-300 microns, is then cut.
The photonic crystal fiber is rear-earth-doped quartzy active photonic crystal optical fibre or undoped pure quartzy passive light
Photonic crystal fiber.
The invention has the following advantages that
1, it is collapsed using carbon dioxide laser heating, the wavelength of carbon dioxide laser is 10.6 microns, is quartz glass
Absorption bands can play good heat effect；Compared to more previous oxyhydrogen flame and electric arc heated, laser is as a kind of cleaning
The energy and laser facula is controllable avoids the damage of mode bring optical fiber surface and the gold of oxyhydrogen flame or the heating of other electrode discharges
Belong to impurity sputtering pollution；
2, it is collapsed using the heating of carbon dioxide laser Rotating with Uniform, can quickly and uniformly realize that inside and outside different sizes are empty
Uniformly synchronizing for stomata is collapsed, to obtain smooth face of collapsing；It compares when electric arc heated is collapsed, because large mode field PCF is empty
The presence of air hole structure causes the variation of thermal conductivity, it may appear that inner air and outer air hole is collapsed nonsynchronous situation, laser heating method
Use, greatly improve such case；
3, M shape V-groove cover board is designed and makes, the flat presser feet of the centre of the M shape V-groove cover board can be by the optical fiber
It is limited within the scope of the triangle of flat presser feet and V-groove composition, avoids optical fiber from shaking in rotary heating, lead to air
Hole is collapsed unevenly, and is adapted in the various sizes of optical fiber of outer diameter.
4, it carries out collapsing directly on photonic crystal fiber and obtains solid-state end cap, utilize conventional optical fiber cutter and optical fiber
Cutting and processing can be completed in abrasive disk, and can carry out angle cutting and polishing；
5, operating method is simple and practical, short preparation period, preparation cost are low.
Detailed description of the invention
Fig. 1 makes M shape V-groove cover board and V-groove schematic diagram by oneself
1 it is M shape V-groove cover board, 2 be flat presser feet among cover board, 3 be optical fiber, 4 is V-groove；
The schematic cross-section of Fig. 2 photonic crystal fiber；
The photonic crystal fiber of Fig. 3 microscopically observation changes side view before and after collapsing；
A left side is before collapsing, after the right side is collapses
The schematic diagram of optical fiber integration end cap in Fig. 4 embodiment 3.
Specific embodiment
Below with reference to example and attached drawing, the invention will be further described, but protection model of the invention should not be limited with this
It encloses.
Embodiment 1:
(1) taking an outer diameter is 400 microns, 200 microns of inner cladding, fibre core are 40 microns, surrounding layer air bore dia is 12
Micron, inner cladding air bore dia are 2 microns of photonic crystal fiber, first handle optical fiber surface with analysis absolute alcohol, then by institute
The optical fiber stated is placed in standard fiber fixture, and the distance of position to the fiber end face of optical fiber clamping is 10cm；
(2) the standard fiber fixture is placed in the fixture card slot of optical fiber splicer, the optical fiber is placed in optical fiber
In two V-grooves of heat sealing machine, the distance between two V-grooves are set as 4cm；By homemade M shape V-groove cover board (such as Fig. 1 institute
Show), it is depressed along V-groove recess direction, the flat presser feet (as shown in figure 1 2) of the centre of the M shape V-groove cover board will
The optical fiber is limited within the scope of the triangle of flat presser feet and V-groove composition；
(3) heat sealing machine parameter is arranged: laser is 10.6 microns of carbon dioxide laser, and laser heating power is 10W；Optical fiber
Rotation speed is 0.05 °/ms；Heating time is 9000ms；
(4) start heat sealing machine, emit laser, start timing, heating rotates while starting；Observe welding display screen, observation
Whether optical fiber rotates smoothly；If optical fiber is shaken, stop heating, cleaning V-groove and balance presser feet after repeat above step after
Continuous experiment；
(5) reach the heating setpoint time, take out optical fiber and be placed in microscopically observation measurement, areas transparent of collapsing measures:
Zone length of collapsing is 500 microns；Collapse adjacent two airport in region end face length difference be no more than 10 microns；
(6) region of collapsing for successful optical fiber of collapsing is placed under large-diameter fibre-optical cutter, on demand by fiber cut
Angle is set as 0 °, and the length i.e. length of end cap for retaining region of collapsing is 300 microns, is then cut.
Embodiment 2:
(1) taking an outer diameter is 400 microns, 200 microns of inner cladding, fibre core are 40 microns, surrounding layer air bore dia is 12
Micron, inner cladding air bore dia are 2 microns of photonic crystal fiber, first handle optical fiber surface with analysis absolute alcohol, then by institute
The optical fiber stated is placed in standard fiber fixture, and the distance of position to the fiber end face of optical fiber clamping is 10cm；
(2) the standard fiber fixture is placed in the fixture card slot of optical fiber splicer, the optical fiber is placed in optical fiber
In two V-grooves of heat sealing machine, the distance between two V-grooves are set as 4cm；By homemade M shape V-groove cover board (such as Fig. 1 institute
Show), it is depressed along V-groove recess direction, the flat presser feet (as shown in figure 1 2) of the centre of the M shape V-groove cover board will
The optical fiber is limited within the scope of the triangle of flat presser feet and V-groove composition；
(3) heat sealing machine parameter is arranged: laser is 10.6 microns of carbon dioxide laser, and laser heating power is 15W；Optical fiber
Rotation speed is 0.15 °/ms；Heating time is 20000ms；
(4) start heat sealing machine, emit laser, start timing, heating rotates while starting；Observe welding display screen, observation
Whether optical fiber rotates smoothly；If optical fiber is shaken, stop heating, cleaning V-groove and balance presser feet after repeat above step after
Continuous experiment；
(5) reach the heating setpoint time, take out optical fiber and be placed in microscopically observation measurement, areas transparent of collapsing measures:
Zone length of collapsing is 1000 microns；Collapse adjacent two airport in region end face length difference be no more than 10 microns；
(6) 6) region of collapsing for successful optical fiber of collapsing is placed under large-diameter fibre-optical cutter, on demand cuts optical fiber
Chamfer degree is set as 8 °, and the length i.e. length of end cap for retaining region of collapsing is 40 microns, is then cut.
Embodiment 3:
(1) taking an outer diameter is 570 microns, 430 microns of inner cladding, fibre core are 110 microns, surrounding layer air bore dia is 15
Micron, inner cladding air bore dia are 3 microns of photonic crystal fiber, first handle optical fiber surface with analysis absolute alcohol, then by institute
The optical fiber stated is placed in standard fiber fixture, and the distance of position to the fiber end face of optical fiber clamping is 10cm；
(2) the standard fiber fixture is placed in the fixture card slot of optical fiber splicer, the optical fiber is placed in optical fiber
In two V-grooves of heat sealing machine, the distance between two V-grooves are set as 4cm；By homemade M shape V-groove cover board (such as Fig. 1 institute
Show), it is depressed along V-groove recess direction, the flat presser feet (as shown in figure 1 2) of the centre of the M shape V-groove cover board will
The optical fiber is limited within the scope of the triangle of flat presser feet and V-groove composition；
(3) heat sealing machine parameter is arranged: laser is 10.6 microns of carbon dioxide laser, and laser heating power is 20W；Optical fiber
Rotation speed is 0.1 °/ms；Heating time is 10000ms；
(4) start heat sealing machine, emit laser, start timing, heating rotates while starting；Observe welding display screen, observation
Whether optical fiber rotates smoothly；If optical fiber is shaken, stop heating, cleaning V-groove and balance presser feet after repeat above step after
Continuous experiment；
(5) reach the heating setpoint time, take out optical fiber and be placed in microscopically observation measurement, areas transparent of collapsing measures:
Zone length of collapsing is 800 microns；Collapse adjacent two airport in region end face length difference be no more than 10 microns；
(6) region of collapsing for successful optical fiber of collapsing is placed under large-diameter fibre-optical cutter, on demand by fiber cut
Angle is set as 0 °, and the length i.e. length of end cap for retaining region of collapsing is 100 microns, is then cut.
As a result as shown in Figure 4.
Embodiment 4:
(1) taking an outer diameter is 600 microns, 450 microns of inner cladding, fibre core are 120 microns, surrounding layer air bore dia is 16
Micron, inner cladding air bore dia are 3 microns of photonic crystal fiber, first handle optical fiber surface with analysis absolute alcohol, then by institute
The optical fiber stated is placed in standard fiber fixture, and the distance of position to the fiber end face of optical fiber clamping is 10cm；
(2) the standard fiber fixture is placed in the fixture card slot of optical fiber splicer, the optical fiber is placed in optical fiber
In two V-grooves of heat sealing machine, the distance between two V-grooves are set as 4cm；By homemade M shape V-groove cover board (such as Fig. 1 institute
Show), it is depressed along V-groove recess direction, the flat presser feet (as shown in figure 1 2) of the centre of the M shape V-groove cover board will
The optical fiber is limited within the scope of the triangle of flat presser feet and V-groove composition；
(3) heat sealing machine parameter is arranged: laser is 10.6 microns of carbon dioxide laser, and laser heating power is 20W；Optical fiber
Rotation speed is 0.1 °/ms；Heating time is 15000ms；
(4) start heat sealing machine, emit laser, start timing, heating rotates while starting；Observe welding display screen, observation
Whether optical fiber rotates smoothly；If optical fiber is shaken, stop heating, cleaning V-groove and balance presser feet after repeat above step after
Continuous experiment；
(5) reach the heating setpoint time, take out optical fiber and be placed in microscopically observation measurement, areas transparent of collapsing measures:
Zone length of collapsing is 900 microns；Collapse adjacent two airport in region end face length difference be no more than 10 microns；
(6) region of collapsing for successful optical fiber of collapsing is placed under large-diameter fibre-optical cutter, on demand by fiber cut
Angle is set as 0 °, and the length i.e. length of end cap for retaining region of collapsing is 200 microns, is then cut.
Experiment shows that the invention avoids external quartz glass end caps and cuts with the optical fiber faced when photon crystal optical fiber fusion splicing
The face out-of-flatness of cutting off leads to the problem of heat seal strength deficiency, can directly collapse to obtain seamless company on original photonic crystal fiber
The end cap connect is convenient for subsequent processing application, while not influencing the laser activity of optical fiber.
Claims (2)
1. a kind of preparation method of photonic crystal fiber integration end cap, it is characterised in that this method includes the following steps:
1) taking an outer diameter is 400-600 microns of photonic crystal fiber, first handles optical fiber surface with analysis absolute alcohol, then will be described
Optical fiber be placed in standard fiber fixture, optical fiber clamping position to fiber end face distance be 10cm；
2) the standard fiber fixture is placed in the fixture card slot of optical fiber splicer, the optical fiber is placed in optical fiber splicer
Two V-grooves in, the distance between two V-grooves are set as 4cm；By homemade M shape V-groove cover board, along V-groove recess side
To depressing, the optical fiber is limited in flat presser feet and V-type by the flat presser feet of the centre of the M shape V-groove cover board
Within the scope of the small triangle of slot composition；
3) heat sealing machine parameter is arranged: laser is 10.6 microns of carbon dioxide laser, and laser heating power is 10W-20W；Optical fiber
Rotation speed is 0.05-0.15 °/ms；Heating time is 9000-20000ms；
4) start heat sealing machine, emit laser, start timing, heating rotates while starting；Welding display screen is observed, optical fiber is observed
Whether rotate smoothly；If optical fiber is shaken, stop heating, after clearing up V-groove and balance presser feet, repeats above step and continue in fact
It tests；
5) reach the heating setpoint time, take out optical fiber and be placed in microscopically observation measurement, areas transparent of collapsing, zone length of collapsing
It is 500-1000 microns；Collapse adjacent two airport in region end face length difference be no more than 10 microns；
6) region of collapsing for successful optical fiber of collapsing is placed under large-diameter fibre-optical cutter, on demand sets fiber cut angle
It is set to 0-8 °, the length i.e. length of end cap for retaining region of collapsing is 40-300 microns, is then cut.
2. the preparation method of photonic crystal fiber integration end cap according to claim 1, it is characterized in that the photon
Crystal optical fibre is rear-earth-doped quartzy active photonic crystal optical fibre or undoped pure quartzy passive photonic crystal optical fiber.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US20020197014A1 (en) * | 2001-06-22 | 2002-12-26 | Micro Photonix Integration Corporation | Manufacture of polarization maintaining optical fiber coupler |
| CN103487901A (en) * | 2013-09-27 | 2014-01-01 | 武汉锐科光纤激光器技术有限责任公司 | Optical fiber laser bundle combining device |
| CN103490273A (en) * | 2013-10-10 | 2014-01-01 | 武汉锐科光纤激光器技术有限责任公司 | High-power optical fiber transmission system |
| US9453967B2 (en) * | 2014-10-17 | 2016-09-27 | Lumentum Operations Llc | High power misalignment-tolerant fiber assembly |
| CN104808288B (en) * | 2015-04-14 | 2018-02-13 | 中国科学院上海光学精密机械研究所 | High efficiency and heat radiation big mode field area mid-infrared light photonic crystal fiber and its laser |
| CN105929482B (en) * | 2016-06-24 | 2022-05-06 | 中国工程物理研究院激光聚变研究中心 | Optical fiber end cap and method of making same |
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