CN101013182A - Micro-structural optical fibre selectively filling method and judge aligning system - Google Patents
Micro-structural optical fibre selectively filling method and judge aligning system Download PDFInfo
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- CN101013182A CN101013182A CN 200710056742 CN200710056742A CN101013182A CN 101013182 A CN101013182 A CN 101013182A CN 200710056742 CN200710056742 CN 200710056742 CN 200710056742 A CN200710056742 A CN 200710056742A CN 101013182 A CN101013182 A CN 101013182A
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Abstract
It is a microstructure fiber selective filling method and judgment aiming system, the filling system completed by the following steps: 1) pulling to produce single-hole fiber; 2) pre-aligning, processing the produced single-hole fiber and the filling photonic crystal fiber with end-cutting and aiming at the center hole heart; 3) accurate alignment, using the judgment aiming system precisely aiming at the center hole heart of the single hole fiber and photonic crystal fiber; 4) completing filling. The said judgment aiming system comprises laser, coupler, and power meter in serial, and during the measurement, the closely docking single-hole fiber and photonic crystal fiber is placed between the coupler and the power meter. The invention applies to all center hole selective filling of the prohibit-belt fibers that the fiber core hole size is greater than or equal to the single-hole fiber. Requiring only a small section of single-hole fiber, the invention can process a fiber core hole filling of different structures prohibit-belt fibers. Meanwhile, it reduces the length of single-hole fiber and increases the air hole size, and it can appropriately reduce the filling time.
Description
Technical field
The present invention relates to a kind of optical fibre selectively filling method.Particularly relate to a kind of micro-structural optical fibre selectively filling method and judgement alignment system that can carry out the filling of fibre core to the forbidden band type optical fiber of various structures.
Background technology
At present, at home and abroad carry out rapidly about the research of photonic crystal fiber.The design feature of photonic crystal fiber is exactly to exist on the xsect along the micro-pore structure of fiber axis to the periodic distribution of unlimited extension.The size of these pores and structure distribution provide a very big design free space, if in airport, introduce new material simultaneously, light transport property therein might change, can obtain many photonic crystal fiber function elements whereby, as optical attenuator, optical filter, photoswitch, dispersion compensator etc., also can be used in sensing or the nonlinear research.Input ratio is bigger aspect the experimental study of filling based on microstructured optical fibers in the world, and achievement is also a lot.
The selection filling is exactly to introduce material requested in the covering hole of photonic crystal fiber or fibre core hole, fills in the middle of the some of covering hole or certain several hole even.But present research also one or several hole of not considering the covering hole to fill, because this has suitable difficulty.
People such as Yanyi Huang were according to covering hole with the center pit flow velocity different principle of liquid in different sizes, by laminar flow velocity formula in the cylindrical hole in 2004
Analysis, the radius that obtains filling speed and hole becomes quadratic relationship, the Kong Yueda filling speed is fast more, filling distance in the inherent fibre core hole of identical time is big, utilize this principle, through filling-ultraviolet curing-cut-out-filling repeatedly ... a plurality of steps have realized the selection in fibre core hole is filled.It is too complicated that but this selection fill method seems, needs " filling-ultra-violet curing-cut-out " operation repeatedly.And good watch-dog will be arranged, otherwise be difficult to clearly to judge in the covering hole the accurate position of liquid in the liquid and fibre core hole.Therefore it requires very high to experimental conditions.In fact this method also has two shortcomings: the one, and it can only be used for filling covering hole and the bigger optical fiber of fibre core hole dimension difference; The 2nd, the material of filling must be curable or will mix hardening agent that this has greatly limited the application of the method.
Another kind of diverse method is to be proposed by people such as Limin Xiao, they utilize traditional common heat sealing machine, because the arc energy of discharge has a distribution at fiber end face: reduce gradually to the fibre core hole from the covering porose area, just formed a thermograde (covering porose area temperature is higher than the fibre core hole) at fiber end face like this, be easy to make the covering hole of fiber end face to subside, the result blocks the covering hole of end face, and it is unimpeded only to have stayed the fibre core hole.The character of subsiding in hole depends on welding current, these three factors of the deviation post of welding duration and optical fiber, if discharge parameter is provided with improper, the incomplete phenomenon that will occur that center pit subsides together or the covering hole subsides in discharge is so they have carried out enough detail analysis experiments to this.Obvious this method is simple and easy operating than first method.For with a kind of optical fiber, in case discharge parameter has determined that later experiment is as long as operated according to this discharge parameter.But this method also is subjected to certain restriction, it requires the diameter gap in center pit and covering hole that the multiple relation is preferably arranged, and its major defect is the photonic crystal fiber for the different structure parameter, discharge parameter also can have a long way to go, optical fiber for a kind of tactic pattern will could be determined one group of discharge parameter through repeatedly testing, and for the optical fiber of another tactic pattern, all discharge parameters redefine again.Therefore this method is although be simple, and really operating still will have suitable experience skill.
Summary of the invention
Technical matters to be solved by this invention is that a kind of micro-structural optical fibre selectively filling method and judgement alignment system that can carry out the filling of fibre core to the forbidden band type optical fiber of various structures is provided.
The technical solution adopted in the present invention is: a kind of micro-structural optical fibre selectively filling method and judgement alignment system, and its fill method is to be finished by following steps:
1) draws single hole optical fiber, that is, draw the single hole optical fiber corresponding one section Len req with photonic crystal fiber to be filled;
2) prealignment carries out the end face cutting process and the aligned central holes heart with single hole optical fiber and the photonic crystal fiber to be filled that draws;
3) accurately aim at, use the judgement alignment system accurately to aim at the center pit heart of single hole optical fiber and photonic crystal fiber;
4) finish filling.
The structure of the described single hole optical fiber that is drawn is to be formed by the fibre core hole in outermost covering, middle layer and the airport at center.
Described prealignment be by naked eyes or CCD imaging system both one of, make single hole optical fiber and photonic crystal fiber to be filled the two the center pit heart point-blank.
Described use alignment system is after utilizing laser instrument to make laser pass through the fibre core hole of coupling mechanism, single hole optical fiber, photonic crystal fiber center pit to be filled, to arrive power meter, and the reading that shows by power meter is judged the alignment case of the two.
Described filling is that the other end insertion of single hole optical fiber is waited to fill out in the liquid, relies on capillarity to make liquid directly import to the center pit of overall optical photonic crystal fiber through single hole optical fiber.
It judges alignment system, is to be set gradually by laser instrument, coupling mechanism, power meter to constitute, and in the detection, the single hole optical fiber and the photonic crystal fiber of closed butt joint is arranged between coupling mechanism and the power meter.
Micro-structural optical fibre selectively filling method of the present invention and judgement alignment system are applicable to the selection filling of all core size being carried out center pit more than or equal to the forbidden band type optical fiber of used single hole optical fiber.The present invention only needs a bit of single hole optical fiber, just can carry out the filling in fibre core hole to the forbidden band type optical fiber of various structures.Reduce the length of single hole optical fiber or the size of increase airport simultaneously, can suitably reduce the filling time.
Description of drawings
Fig. 1 is that optical fiber is filled synoptic diagram;
Fig. 2 is a single hole optical fiber schematic cross-section;
Fig. 3 judges the alignment system structural representation.
Wherein:
1: laser 2: coupling mechanism
3: single hole optical fiber 4: photonic crystal fiber
5: power meter 6: liquid
7: covering 8: the fibre core hole
9: airport 10: laser
Embodiment
Below in conjunction with embodiment micro-structural optical fibre selectively filling method of the present invention and judgement alignment system are made a detailed description.
As shown in Figure 1, the principle of micro-structural optical fibre selectively filling method of the present invention is: draw a bit of single hole optical fiber 3, make its fibre core bore dia smaller or equal to photonic crystal fiber 4 center-hole diameters, with itself and photonic crystal fiber 4 closed butt joints, the center pit heart that guarantees the two point-blank.End with single hole optical fiber 3 inserts in the liquid that will fill then, utilizes capillarity, and liquid 6 is entered in the fibre core of crystal optical fibre 4 along the fibre core of single hole optical fiber 3.
Micro-structural optical fibre selectively filling method of the present invention specifically is to be finished by following steps:
1) draws single hole optical fiber, that is, draw the corresponding single hole optical fiber of the photonic crystal fiber with to be filled of one section Len req (only needing 1-2cm in the experiment).
As shown in Figure 2, the single hole optical fiber cross section that the present invention drew is to be made of the fibre core hole (doped region) 8 in outermost covering 7, middle layer, airport 9, and the material of fibre core hole 8 shown in the figure and covering 7 is identical with the conventional single mode fiber material.Just the fibre core hole of the single hole optical fiber that the present invention drew and the refractive index of covering differ 0.051, so that efficiently light is limited in fibre core hole transmission (this moment intermediate air hole can not leaded light).
If the fibre core bore dia of the single hole optical fiber that is drawn is a, the diameter of single hole optical fiber is b, the center-hole diameter of photonic crystal fiber to be filled is c, and so, the fibre core bore dia a of the single hole optical fiber that is drawn and the corresponding relation of photonic crystal fiber center-hole diameter c to be filled are: a≤c.
According to the application in the reality, the present invention sets following correlation parameter, and for single hole optical fiber, the diameter of airport 9, fibre core hole 8, covering 7 is made as 2.5 μ m respectively, 5 μ m, 125 μ m.The refringence of fibre core hole 8 and covering 7 is made as 0.051.
Used optical maser wavelength 0.96 μ m.For photonic crystal fiber, covering bore dia, covering pitch of holes, fibre core bore dia are respectively 4.5 μ m, 5 μ m, 6 μ m.The airport 9 of single hole optical fiber is big more, and the speed of filling will be fast more, but will be prerequisite smaller or equal to the center-hole diameter of photonic crystal fiber with the diameter in the fibre core hole 8 of single hole optical fiber.If we have drawn one section single hole optical fiber that the fibre core bore dia is 5 μ m, that can have been filled with this section optical fiber more than or equal to the photonic crystal fiber of 5 μ m for all fibre core holes (being center pit) diameter.Therefore fill experiment for us, this method is easily practical.
2) prealignment is with the single hole optical fiber 3 that draws with photonic crystal fiber 4 to be filled carries out the end face cutting process and aligned central holes is fixed.Prealignment is by naked eyes or CCD imaging system, make single hole optical fiber and photonic crystal fiber to be filled the two center pit substantially point-blank.
3) accurately aim at, use the judgement alignment system accurately to aim at the hole heart of single hole optical fiber and photonic crystal fiber.The center pit heart that how to guarantee single hole optical fiber and photonic crystal fiber point-blank is the key that can filling successful.Dislocation occurs if the center pit heart is aimed at, packing material just is easy to enter into covering.
The present invention adopt as shown in Figure 3 judge alignment system judge single hole fiber core hole the Kong Xinyu photonic crystal fiber the center pit heart whether point-blank.
Specific practice is: the fibre core hole 8 of laser 10 being passed single hole optical fiber 3 through coupling mechanism 2 by laser instrument 1, enter the center pit of photonic crystal fiber 4 from the other end, the other end at photonic crystal fiber 4 utilizes power meter 5 to survey, by the reading of observation power meter 5 and according to sunykatuib analysis, whether can judge the two centrally aligned.
The result who obtains image that how much simulates according to off-centring, laser 10 enters from the single hole fiber end face, in the transmission of fibre core hole, but can not transmit at center pit, enter photonic crystal fiber then, Simulation result has shown from the distribution of the luminous energy of photonic crystal fiber other end outgoing.Can find, the amount of center pit skew is big more, the luminous energy that detects is just few more, concentration of energy and maximum when not having skew, along with side-play amount increases, the energy asymmetric and rapid minimizing that begins to become so can in time adjust the relative position of single hole optical fiber and photonic crystal fiber according to the emergent light energy size that detects, just can have been determined the two centrally aligned when the luminous energy that detects is maximum.
4) finish filling.Described filling is that the other end insertion of single hole optical fiber is waited to fill out in the liquid, relies on capillarity to make liquid directly import to the center pit of overall optical photonic crystal fiber through single hole optical fiber.
Promptly, when determine single hole optical fiber and photonic crystal fiber the two the hole heart point-blank after, the other end of single hole optical fiber is inserted in the liquid of syringe needle, utilizes capillarity, liquid will enter in the fibre core of forbidden band optical fiber along single hole fiber core hole.
As shown in Figure 3, judgement alignment system of the present invention, be to set gradually and constitute by laser instrument 1, coupling mechanism 2, power meter 5, single hole optical fiber 3 and photonic crystal fiber 4 with closed butt joint during detection are arranged between coupling mechanism 2 and the power meter 5, wherein the other end of single hole optical fiber 3 is positioned at a side of coupling mechanism 2, photonic crystal fiber 4 other ends are positioned at a side of power meter 5, thereby just can determine accurately whether single hole optical fiber 3 and photonic crystal fiber 4 the two center are aimed at, and accurately aim at.
Claims (7)
1. a micro-structural optical fibre selectively filling method is characterized in that, is to be finished by following steps:
1) draws single hole optical fiber, that is, draw the single hole optical fiber corresponding one section Len req with photonic crystal fiber to be filled;
2) prealignment carries out the end face cutting process and the aligned central holes heart with single hole optical fiber and the photonic crystal fiber to be filled that draws;
3) accurately aim at, use the judgement alignment system accurately to aim at the center pit heart of single hole optical fiber and photonic crystal fiber;
4) finish filling.
2. micro-structural optical fibre selectively filling method according to claim 1 is characterized in that, the structure of the described single hole optical fiber that is drawn is that the airport (9) by the fibre core hole (8) in outermost covering (7), middle layer and center forms.
3. micro-structural optical fibre selectively filling method according to claim 1 is characterized in that, the fibre core bore dia of the described single hole optical fiber that is drawn is smaller or equal to the photonic crystal fiber center-hole diameter.
4. micro-structural optical fibre selectively filling method according to claim 1, it is characterized in that, described prealignment be by naked eyes or CCD imaging system both one of, make single hole optical fiber and photonic crystal fiber to be filled the two the center pit heart point-blank.
5. micro-structural optical fibre selectively filling method according to claim 1, it is characterized in that, described use alignment system, be after utilizing laser instrument to make laser pass through coupling mechanism, single hole fiber core hole, photonic crystal fiber center pit to be filled, arrive power meter, the reading that shows by power meter is judged the two alignment case of single hole optical fiber and photonic crystal fiber.
6. micro-structural optical fibre selectively filling method according to claim 1, it is characterized in that, described filling is that the other end insertion of single hole optical fiber is waited to fill out in the liquid, relies on capillarity to make liquid directly import to the center pit of overall optical photonic crystal fiber through single hole optical fiber.
7. judge alignment system for one kind, it is characterized in that, be to set gradually formation, in the detection, the single hole optical fiber (3) and the photonic crystal fiber (4) of closed butt joint be arranged between coupling mechanism (2) and the power meter (5) by laser instrument (1), coupling mechanism (2), power meter (5).
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| CN101802665B (en) * | 2007-09-19 | 2012-08-22 | 三菱电线工业株式会社 | Optical fiber structure, its manufacturing device, and block-shaped chip used therefor |
| CN102721997A (en) * | 2012-06-01 | 2012-10-10 | 天津大学 | Optical switch and optical path control system thereof |
| CN103353634A (en) * | 2013-05-28 | 2013-10-16 | 南京航空航天大学 | Method for precisely aligning photonic crystal fiber to single mode fibers |
| CN103454257A (en) * | 2013-09-04 | 2013-12-18 | 上海电力学院 | Method for judging coupling of laser into wheel-shaped optical fiber core |
| CN105806414A (en) * | 2016-04-26 | 2016-07-27 | 浙江大学 | Optical fiber temperature and humidity sensor, temperature and humidity sensing system and temperature and humidity regulating method |
| CN106019482A (en) * | 2016-08-04 | 2016-10-12 | 华中科技大学 | Method for splicing photonic crystal fiber and single-mode fiber |
| CN109596206A (en) * | 2019-01-25 | 2019-04-09 | 武汉理工大学 | Vibrating sensor based on liquid filling photonic crystal fiber |
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| WO2000049436A1 (en) * | 1999-02-19 | 2000-08-24 | Blazephotonics Limited | Improvements in or relating to photonic crystal fibres |
| JP3872264B2 (en) * | 2000-08-09 | 2007-01-24 | 三菱電線工業株式会社 | Photonic crystal fiber manufacturing method |
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| CN101802665B (en) * | 2007-09-19 | 2012-08-22 | 三菱电线工业株式会社 | Optical fiber structure, its manufacturing device, and block-shaped chip used therefor |
| US8419296B2 (en) | 2007-09-19 | 2013-04-16 | Mitsubishi Cable Industries, Ltd. | Optical fiber structure, system for fabricating the same, and block-like chip for use therein |
| CN102721997A (en) * | 2012-06-01 | 2012-10-10 | 天津大学 | Optical switch and optical path control system thereof |
| CN103353634A (en) * | 2013-05-28 | 2013-10-16 | 南京航空航天大学 | Method for precisely aligning photonic crystal fiber to single mode fibers |
| CN103353634B (en) * | 2013-05-28 | 2015-08-12 | 南京航空航天大学 | The accuracy alignment method of a kind of photonic crystal fiber and single-mode fiber |
| CN103454257A (en) * | 2013-09-04 | 2013-12-18 | 上海电力学院 | Method for judging coupling of laser into wheel-shaped optical fiber core |
| CN103454257B (en) * | 2013-09-04 | 2015-08-05 | 上海电力学院 | For judging whether laser is coupled into the method for wheel shape fiber core |
| CN105806414A (en) * | 2016-04-26 | 2016-07-27 | 浙江大学 | Optical fiber temperature and humidity sensor, temperature and humidity sensing system and temperature and humidity regulating method |
| CN106019482A (en) * | 2016-08-04 | 2016-10-12 | 华中科技大学 | Method for splicing photonic crystal fiber and single-mode fiber |
| CN106019482B (en) * | 2016-08-04 | 2019-01-04 | 华中科技大学 | A kind of welding process of photonic crystal fiber and single mode optical fiber |
| CN109596206A (en) * | 2019-01-25 | 2019-04-09 | 武汉理工大学 | Vibrating sensor based on liquid filling photonic crystal fiber |
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