CN109581598B - Coaxial double-wave optical fiber connector - Google Patents
Coaxial double-wave optical fiber connector Download PDFInfo
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- CN109581598B CN109581598B CN201811520090.1A CN201811520090A CN109581598B CN 109581598 B CN109581598 B CN 109581598B CN 201811520090 A CN201811520090 A CN 201811520090A CN 109581598 B CN109581598 B CN 109581598B
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 90
- 239000000835 fiber Substances 0.000 claims abstract description 142
- 238000003466 welding Methods 0.000 claims description 9
- 230000003287 optical effect Effects 0.000 abstract description 14
- 238000005520 cutting process Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 5
- 238000010168 coupling process Methods 0.000 description 12
- 230000008878 coupling Effects 0.000 description 10
- 238000005859 coupling reaction Methods 0.000 description 10
- 238000010586 diagram Methods 0.000 description 8
- 238000004088 simulation Methods 0.000 description 5
- 210000001624 hip Anatomy 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 230000009977 dual effect Effects 0.000 description 2
- 238000012576 optical tweezer Methods 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 238000005498 polishing Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000001069 Raman spectroscopy Methods 0.000 description 1
- 238000001237 Raman spectrum Methods 0.000 description 1
- 238000005422 blasting Methods 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
- 238000012536 packaging technology Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000523 sample Substances 0.000 description 1
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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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3873—Connectors using guide surfaces for aligning ferrule ends, e.g. tubes, sleeves, V-grooves, rods, pins, balls
- G02B6/3885—Multicore or multichannel optical connectors, i.e. one single ferrule containing more than one fibre, e.g. ribbon type
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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
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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
- G02B6/255—Splicing of light guides, e.g. by fusion or bonding
- G02B6/2552—Splicing of light guides, e.g. by fusion or bonding reshaping or reforming of light guides for coupling using thermal heating, e.g. tapering, forming of a lens on light guide ends
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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
- G02B6/36—Mechanical coupling means
- G02B6/38—Mechanical coupling means having fibre to fibre mating means
- G02B6/3807—Dismountable connectors, i.e. comprising plugs
- G02B6/3833—Details of mounting fibres in ferrules; Assembly methods; Manufacture
- G02B6/3855—Details of mounting fibres in ferrules; Assembly methods; Manufacture characterised by the method of anchoring or fixing the fibre within the ferrule
- G02B6/3861—Adhesive bonding
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Engineering & Computer Science (AREA)
- Plasma & Fusion (AREA)
- Mechanical Coupling Of Light Guides (AREA)
- Optical Couplings Of Light Guides (AREA)
Abstract
The invention provides a coaxial double-wave optical fiber connector. The method is characterized in that: the optical fiber connector consists of a standard single-mode optical fiber, a multi-core optical fiber connector, a multi-core optical fiber and a coaxial double-wave optical fiber. In the system: one end of the multi-core fiber is connected with each fiber core and the single-mode fiber through the multi-core fiber connector, the other end of the multi-core fiber and the coaxial double-waveguide fiber are subjected to tapering cutting, and the two are welded after geometric structural parameters are adjusted, so that the connection of the multi-core fiber middle core and the coaxial double-waveguide fiber middle core, and the connection of the multi-core fiber offset fiber core and the coaxial double-waveguide fiber ring core are realized. The invention can be used for the optical path connection of coaxial double-waveguide optical fibers.
Description
(I) technical field
The invention relates to a coaxial double-wave optical fiber connector, belonging to the technical field of optical fiber devices.
(II) background of the invention
In recent years, with the demand for communication and sensing applications, various special optical fibers have been invented. Such as a suspended core fiber having a micro-hole structure, a multi-core fiber having a plurality of core waveguides, a ring-core fiber having a ring-waveguide core, a bragg fiber, a coaxial double-waveguide fiber, and the like. Although these special optical fibers have great application potential and great economic value, due to the structural particularity of these optical fibers, the optical path connection is not as simple as that of standard single-mode optical fibers, and the optical fibers can be simply welded by a common commercial optical fiber welding machine. Therefore, the high efficiency and low loss connection of these special optical fibers and standard optical fibers is the key to the wide application.
Patent CN101825741B proposes a coaxial double-waveguide fiber having a central core waveguide and a coaxially distributed ring-core waveguide. Such coaxial dual-waveguide optical fibers have found numerous applications in subsequent developments. For example, patent CN101907743B proposes that a throughput type optical fiber tweezers is prepared by using such coaxial dual waveguide fiber, which can be used for capturing and throughput oscillation of tiny particles such as cells; the patent CN106770167A proposes that an optical tweezers type fiber Raman probe is prepared by using coaxial double waveguide fibers, can stably capture cells and simultaneously excite and collect Raman spectra of the cells, and has a great application prospect in cell biological component analysis; an optical gun based on coaxial double waveguide Fiber is proposed in the article "Fiber based optical gun for particle blasting", which provides a new method for cell manipulation (Deng H, Zhang Y, Yuan T, et al.
In the application of the existing coaxial dual-waveguide fiber, there are generally two methods for coupling light injection into two core waveguides: fused biconical taper coupling and side-throw coupling. The fused biconical taper coupling means that after the middle core of the coaxial double-waveguide fiber is welded with the standard single-mode fiber, the coaxial double-waveguide fiber is fused and tapered, so that the light of the middle core is coupled into the annular core. The side-throwing coupling is to align and splice the coaxial double-waveguide fiber and the single-mode fiber after side-throwing, the fiber core of the single-mode fiber and the annular fiber core of the coaxial double-waveguide fiber are close to each other, so that the optical path coupling of the annular core fiber core is realized, one end of the coaxial double-waveguide fiber is welded with the standard single-mode fiber, and the optical path coupling of the middle core is realized. However, the side-polishing coupling has strict requirements on the optical fiber side-polishing technology and the optical fiber alignment packaging technology, is greatly influenced by the external environment, and has poor stability.
Disclosure of the invention
The invention aims to provide a coaxial double-wave optical fiber connector which is simple and compact in structure, good in stability, capable of controlling two fiber core waveguides independently and high in coupling efficiency.
The purpose of the invention is realized as follows:
the utility model provides a coaxial two ripples fiber connector, characterized by: the optical fiber connector consists of a standard single-mode optical fiber, a multi-core optical fiber connector, a multi-core optical fiber and a coaxial double-wave optical fiber. In the system: one end of the multi-core fiber realizes the connection of each fiber core and the single-mode fiber through the multi-core fiber connector, and the other end of the multi-core fiber and the coaxial double-waveguide fiber adjust the geometric structure parameters, so that the fiber cores are welded after being matched in position, and the connection of the multi-core fiber middle core and the coaxial double-waveguide fiber middle core, the multi-core fiber offset fiber core and the coaxial double-waveguide fiber annular core is realized.
The coaxial double-wave light guide fiber is provided with a middle fiber core waveguide and a coaxial annular core waveguide.
The multicore fiber has a middle core waveguide and one or more offset core waveguides arranged coaxially and circumferentially.
When the center distance between the middle fiber core and the offset fiber core of the multi-core fiber is equal to the center distance between the middle core and the annular core of the coaxial double-waveguide fiber, the two fibers are directly welded; when the center distance between the middle fiber core and the offset fiber core of the multi-core fiber is not equal to the center distance between the middle core and the annular core of the coaxial double-waveguide fiber, the multi-core fiber and the coaxial double-wave light guide fiber are fused and tapered, the size is adjusted, and the welding is carried out after the matching of geometric structural parameters is realized.
According to the coaxial double-wave optical fiber connector, the multi-core optical fiber is connected with the standard single-mode optical fiber through the commercialized multi-core optical fiber connector, so that each optical path can be independently controlled.
The preparation method of the coaxial double-wave optical fiber connector comprises the following steps:
step 1: selecting a proper multi-core fiber and connecting the multi-core fiber connector, so that each fiber core of the multi-core fiber is connected with the standard single-mode fiber, and the independent control of each fiber core light path of the multi-core fiber is realized;
step 2: respectively carrying out fusion tapering on the multi-core optical fiber and the coaxial double-waveguide optical fiber, and adjusting the structural sizes of the multi-core optical fiber and the coaxial double-waveguide optical fiber at the taper waist to match the multi-core optical fiber and the coaxial double-waveguide optical fiber. In order to ensure the mechanical strength of the optical fiber, the diameters of the conical waists of the two tapering bodies are not too thin, and the fiber core can still transmit light beams with low loss;
and step 3: and cutting the two optical fibers at the cone waist, aligning the two optical fibers with the fiber cores, and welding the two optical fibers so that the middle core of the multi-core optical fiber is aligned and connected with the middle core of the coaxial double-waveguide optical fiber, and the offset fiber core of the multi-core optical fiber is aligned and connected with the annular core of the coaxial double-waveguide optical fiber.
Compared with a coaxial double-wave light guide fiber fused tapering coupling method, the invention does not need to draw the optical fiber to be very thin, thus ensuring the mechanical strength of the optical fiber device and realizing the function of controlling the independent light paths of the annular core waveguide and the intermediate core waveguide; compared with a side-throwing coupling method, the method has better stability and simpler preparation method. Therefore, the invention has the advantages of simplicity, compactness, good stability, independent control of the two fiber core waveguides and high coupling efficiency.
(IV) description of the drawings
Fig. 1 is a schematic structural diagram of a coaxial dual-waveguide optical fiber connector, and a broken line frame corresponds to a partially enlarged view of the connection of a multi-core optical fiber and a coaxial dual-waveguide optical fiber.
Fig. 2(a) is a structure diagram of an end face of a coaxial double waveguide fiber, and fig. 2(b) is a refractive index distribution at a broken line of the end face.
Fig. 3(a) is a structure view of an end face of a two-core optical fiber, and fig. 3(b) is a refractive index distribution at a broken line of the end face of the two-core optical fiber.
Fig. 4 is a configuration diagram of end surfaces of a plurality of types of multi-core optical fibers that can be used, and fig. 4(a) shows a three-core optical fiber, fig. 4(b) shows a four-core optical fiber, and fig. 4(c) shows a five-core optical fiber.
Fig. 5 is a simulation result of light injection from the eccentric core of the dual-core fiber to the annular core of the coaxial dual-waveguide fiber when the dual-core fiber is used as the input fiber.
Fig. 6 is a simulation result of light injection in the annular core of the four core-shifted coaxial dual-waveguide fibers of the five-core fiber, in the case of using the five-core fiber as the input fiber.
FIG. 7 is a schematic diagram of cutting and coaxial dual-waveguide optical fiber welding after adjusting the structural dimension of the eccentric dual-core optical fiber fused biconical taper.
FIG. 8 is a schematic diagram of cutting and core-shifting dual-core fiber welding after structural dimension adjustment of a coaxial dual-waveguide fiber fused biconical taper.
(V) detailed description of the preferred embodiments
The invention is further illustrated with reference to the following figures and specific examples.
Fig. 1 is a schematic structural diagram of a coaxial dual-wave optical fiber connector according to the present invention, and the structure includes a coaxial dual-waveguide fiber 1, a dual-core fiber 2, a standard single-mode fiber 3, and a dual-core fiber connector 4. The end face structure of the coaxial double waveguide fiber 1 is shown in fig. 2(a), and it has an intermediate core 1-1 and a coaxially distributed annular core 1-2, and fig. 2(b) is the refractive index distribution at the dotted line in fig. 2(a), and the refractive index difference between the intermediate core and the annular core and the cladding may be the same or different. The end face structure of the employed two-core optical fiber is shown in fig. 3(a), which has an intermediate core 2-1 and an offset core 2-2, and similarly, fig. 3(b) is a refractive index profile at a dotted line in fig. 3 (a). In practice, the two-core fiber may be replaced by other multi-core fibers, such as the 3-core fiber shown in fig. 4, which have a central core and a plurality of offset cores arranged coaxially and circumferentially. The central core of the multi-core fiber is connected with the coaxial double-waveguide fiber, and the biased peripheral fiber core is connected with the annular core of the coaxial double-waveguide fiber.
Example 1:
the description of the present embodiment is made using a two-core optical fiber. When the center distance between the middle fiber core 2-1 and the offset fiber core 2-2 of the dual-core optical fiber 2 is equal to the center distance between the middle fiber core 1-1 and the annular core 1-2 of the coaxial dual-waveguide optical fiber 1, the dual-core optical fiber 2 and the coaxial dual-waveguide optical fiber 1 can be directly welded in a core-to-core manner, as shown in the enlarged partial view in the dashed line frame of fig. 1.
In order to describe the connection effect of the present invention, a simulation analysis was performed on a coaxial dual-fiber optical connector using a dual-core fiber. The simulation result is shown in fig. 5, where fig. 5(a) shows that z is 0 μm, light beams are input from inside the core-shifted 2-2 of the two-core optical fiber 2, and fig. 5(b), (c) and (d) respectively show that the light beams in the core-shifted are transmitted at z is 500 μm, z is 1000 μm and z is 4000 μm after being input into the ring-shaped core 1-2 of the coaxial two-waveguide optical fiber. It can be seen that after the light beam is input into the annular core 1-2 of the coaxial double-waveguide fiber from the eccentric core 2-2 of the double-core fiber, the light beam is basically and completely bound in the annular core 1-2 for transmission, and the optical field is diffused along the circumference of the annular core 1-2 by the Gaussian optical field until the inside of the annular core is filled. Since the simulation uses a single-wavelength coherent light beam, the light beam propagates in the annular core 1-2 and multi-mode interference occurs, resulting in beam splitting, as shown in fig. 5 (d). However, in coaxial dual waveguide fiber applications, the incoherent beam can be used as the input beam in the annular core, thereby avoiding the occurrence of the splitting phenomenon.
Since the dual-core optical fiber is adopted and only comprises one offset fiber core 2-2, the condition that the optical field is not axisymmetric still occurs after the light beam in the offset core 2-2 is transmitted for a certain distance in the input annular core, which will affect the application of the coaxial dual-waveguide optical fiber (for example, in the application of the optical tweezers of the optical fiber, the annular optical field is required to be axisymmetrically and uniformly distributed, CN 101907743B). In this case, a multicore fiber having a plurality of offset cores axially symmetrically and coaxially distributed may be used as the input fiber. As shown in fig. 6, a five-core optical fiber is used as an input optical fiber, wherein fig. 6(a) shows that z is 0 μm, light beams are input from four eccentric cores 5-2 of the five-core optical fiber, and fig. 6(b), (c) and (d) respectively show that the light beams in the eccentric cores 5-2 are transmitted in the ring core 1-2 of the coaxial double-waveguide optical fiber after being input in the ring core 1-2, and the optical fields are transmitted in the positions where z is 500 μm, z is 1000 μm and z is 4000 μm, so that it can be seen that the optical fields are always axially symmetrically distributed during transmission in the ring core 1-2.
Example 2:
the description of the present embodiment is made using a two-core optical fiber. When the central distance between the middle fiber core and the offset fiber core of the dual-core optical fiber 2 is not equal to the central distance between the middle fiber core and the annular core of the coaxial dual-waveguide optical fiber 1, the structural size of the optical fiber needs to be adjusted by a fused biconical taper method to be matched. In order to ensure the mechanical strength of the optical fiber, the diameters of the two tapered waists are not too thin, and the fiber core can still transmit light beams with low loss. Fig. 7 is a schematic diagram of cutting and coaxial dual-waveguide optical fiber welding after structural size adjustment of the eccentric dual-core optical fiber fused biconical taper, and a fused biconical taper and size adjustment region are provided at a position 3. Fig. 8 is a schematic diagram of cutting and core-shifting dual-core fiber welding after structural size adjustment of the coaxial dual-waveguide fiber fused biconical taper, and a portion 3 is a fused biconical taper and a size adjustment region.
Claims (2)
1. The utility model provides a coaxial two ripples fiber connector, characterized by: the optical fiber connector consists of a standard single-mode optical fiber, a multi-core optical fiber connector, a multi-core optical fiber and a coaxial dual-wave optical fiber; in the composition: one end of the multi-core fiber realizes the connection of each fiber core and the single-mode fiber through the multi-core fiber connector, and the other end of the multi-core fiber and the coaxial double-waveguide fiber adjust the geometric structure parameters to ensure that the fiber cores are welded after being matched in position, so that the connection of the multi-core fiber middle core and the coaxial double-waveguide fiber middle core, the multi-core fiber offset fiber core and the coaxial double-waveguide fiber annular core is realized;
the coaxial double-wave light guide fiber is provided with a middle fiber core waveguide and a coaxial annular core waveguide;
the multicore fiber has a middle core waveguide and one or more offset core waveguides arranged coaxially and circumferentially.
2. The coaxial double-wave optical fiber connector according to claim 1, wherein: when the center distance between the middle fiber core and the offset fiber core of the multi-core fiber is equal to the center distance between the middle core and the annular core of the coaxial double-waveguide fiber, directly welding the two fibers; when the center distance between the middle fiber core and the offset fiber core of the multi-core fiber is not equal to the center distance between the middle core and the annular core of the coaxial double-waveguide fiber, the multi-core fiber and the coaxial double-wave light guide fiber are fused and tapered, the size is adjusted, and the welding is carried out after the matching of geometric structural parameters is realized.
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| CN201811520090.1A CN109581598B (en) | 2018-12-12 | 2018-12-12 | Coaxial double-wave optical fiber connector |
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| CN201811520090.1A CN109581598B (en) | 2018-12-12 | 2018-12-12 | Coaxial double-wave optical fiber connector |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110993140A (en) * | 2019-11-15 | 2020-04-10 | 桂林电子科技大学 | Single-core optical fiber-multi-core optical fiber combined optical motor system |
| CN111025478A (en) * | 2019-11-20 | 2020-04-17 | 桂林电子科技大学 | Single-mode fiber and coaxial double-waveguide fiber coupler with controllable light splitting ratio |
| CN111404611B (en) * | 2020-04-01 | 2021-07-06 | 南京信息工程大学 | Double-signal transmission optical fiber and transmission device and method using same |
| CN111830633A (en) * | 2020-08-04 | 2020-10-27 | 桂林电子科技大学 | Coaxial double-wave light guide fiber fan-in connector |
| CN113866869A (en) * | 2021-10-12 | 2021-12-31 | 桂林电子科技大学 | Mode controller from multi-core fiber to ring-core fiber |
| WO2024072738A1 (en) * | 2022-09-27 | 2024-04-04 | Nlight, Inc. | Optical combiner for distributing laser light/power to a multl-core output fiber and laser system incorporating the optical combiner |
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| US7620280B2 (en) * | 2007-09-05 | 2009-11-17 | Harris Corporation | Filled core optical fiber spliced to optical fiber and method of making the same |
| CN101825741B (en) * | 2010-03-29 | 2011-11-16 | 哈尔滨工程大学 | Coaxial dual-waveguide structured optical fiber with annular waveguide layer and preparation method thereof |
| CN101907743B (en) * | 2010-07-02 | 2012-03-14 | 哈尔滨工程大学 | Throughput type fiber optical tweezers based on coaxial dual-waveguide structure and preparation method |
| CN104181637A (en) * | 2013-05-24 | 2014-12-03 | 无锡万润光子技术有限公司 | All-fiber Bessel light beam generator |
| CN104297866B (en) * | 2014-10-17 | 2016-03-02 | 长飞光纤光缆股份有限公司 | A kind of spatial reuse/demodulation multiplexer being applicable to multi-core fiber and preparation method thereof |
| JP5908559B1 (en) * | 2014-10-17 | 2016-04-26 | 株式会社フジクラ | Optical coupler, laser device, and tapered fiber |
| CN204405899U (en) * | 2014-12-15 | 2015-06-17 | 哈尔滨工程大学 | A kind of multi-fiber connector based on gradient-index lens |
| JP6172642B2 (en) * | 2015-02-18 | 2017-08-02 | 株式会社フジクラ | Multi-core fiber and optical cable |
| CN104698539B (en) * | 2015-03-09 | 2018-01-19 | 哈尔滨工程大学 | A kind of optical fiber surface plasmon body excimer excites focusing arrangement and preparation method thereof |
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Application publication date: 20190405 Assignee: Guilin Qixing District Fiber Optic New Technology Development Center Assignor: GUILIN University OF ELECTRONIC TECHNOLOGY Contract record no.: X2023980045912 Denomination of invention: A coaxial dual waveguide fiber optic connector Granted publication date: 20200911 License type: Common License Record date: 20231108 |