CN104297866B - A kind of spatial reuse/demodulation multiplexer being applicable to multi-core fiber and preparation method thereof - Google Patents
A kind of spatial reuse/demodulation multiplexer being applicable to multi-core fiber and preparation method thereof Download PDFInfo
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- CN104297866B CN104297866B CN201410553936.7A CN201410553936A CN104297866B CN 104297866 B CN104297866 B CN 104297866B CN 201410553936 A CN201410553936 A CN 201410553936A CN 104297866 B CN104297866 B CN 104297866B
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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
- G02B6/245—Removing protective coverings of light guides before coupling
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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
- G02B6/26—Optical coupling means
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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
Abstract
The invention discloses a kind of spatial reuse/demodulation multiplexer being applicable to multi-core fiber and preparation method thereof, comprise and connecting again by the fibre bundle formed through the single-mode fiber of chemical corrosion and after the multi-core fiber of chemical corrosion is aimed at.Fibre bundle corrosion end face is connected with the multi-core fiber of chemical corrosion, uncorroded end face is connected with optical sender, the multi-core fiber of chemical corrosion and uncorroded multi-core fiber welding, after transmitting a segment distance, be connected with the multi-core fiber of chemical corrosion again, another end face of the multi-core fiber of this chemical corrosion is connected with the corrosion end face of another fibre bundle, and the uncorroded end face of this fibre bundle is connected with photoreceiver.The present invention has general application value and application prospect in the SDM system based on multi-core fiber, the sensor-based system based on multi-core fiber, have connect flexibly, stable, insertion loss is low, crosstalk is low, the high advantage of interference-tolerant degree to external world.
Description
Technical field
The invention belongs to multi-core fiber signal transmission technology field, more specifically, relate to a kind of spatial reuse/demodulation multiplexer being applicable to multi-core fiber and preparation method thereof.
Background technology
Current optical communication network scale constantly expands, capacity increases fast, business becomes increasingly abundant, and by this trend, existing single-mode fiber transmission system will occur capacity crisis about the year two thousand twenty.In this context, the multi-core fiber based on space division multiplexing takes full advantage of Spatial Dimension and promotes transmission capacity in single single-mode fiber, becomes one of gordian technique that effectively can overcome the capacity knapsack problem that conventional single mode fiber transmission capacity limits causes.Because multi-core fiber comprises multiple (such as 7 being close in identical cladding size with single-mode fiber, 12, or 19 etc.) fibre core, therefore in the actual use of multi-core fiber, need the problem solved how to be multiplexed in multi-core fiber by single-mode fiber by the signal of optical sender, and how the signal in multi-core fiber is demultiplexed in receiver.
The method adopted that solves the problem at present mainly contains fused biconical taper coupling process and lens focus method, for seven core fibres, the former, by by the end face fused biconical taper of multi-core fiber, is divided into the single-core fiber that 7 bundles are separated, is connected separately after pulling out a segment distance with single-mode fiber again.But inevitably this method technology difficulty is comparatively large, how to ensure to draw cone to be very large difficult point uniformly.This method is lower for the correcting deviation tolerance of fibre core in addition, and just can not adjust once connection again.The method of the signal lens focus in single-mode fiber converges in each fibre core of multi-core fiber by the latter, and the signal lens in multi-core fiber are separated again by collimated in single-mode fiber.But this method needs at least 16 pieces of lens for whole multiplex/demultiplex device, and (multiplex/demultiplex needs 2 × 7=14 block lens collimator, each needs one piece of lens focus/beam splitting before multi-core fiber two end faces), costly, and comparatively huge once putting up volume.This method coupling loss is comparatively large in addition, and lower for the tolerance of external interference, comparatively responsive for factors such as vibrations, is only applicable to study in laboratory.
Summary of the invention
For above defect or the Improvement requirement of prior art, for solving a difficult problem for the signal multiplexing/demultiplexing related in the SDM system based on multi-core fiber and the sensor-based system based on multi-core fiber, the invention provides a kind of spatial reuse/demodulation multiplexer being applicable to multi-core fiber and preparation method thereof, be demultiplexed in the signal multiplexing in single-mode fiber to multi-core fiber and by the signal in multi-core fiber in single-mode fiber.
For achieving the above object, according to one aspect of the present invention, provide a kind of preparation method being applicable to the spatial reuse/demodulation multiplexer of multi-core fiber, comprise the following steps:
Step 1 calculates the core spacing of selected multi-core fiber, and the fibre core number of wherein said multi-core fiber is N;
Step 2 removes the organism coating of its one end of single-mode fiber of the fibre core homogeneity of N root and described multi-core fiber, the corrosion solution that the glass-clad of the described N root single-mode fiber after removal coating immerses concentration higher is simultaneously carried out quick corrosion, to the core spacing of its glass-clad diameter slightly larger than described multi-core fiber, again the described corrosion solution that the glass-clad of described N root single-mode fiber immerses concentration lower is simultaneously carried out accurate corrosion, equal described core spacing to its glass-clad diameter;
Same arrangement is carried out by the distribution of fibre core N number of in described multi-core fiber in one end after corrosion of described N root single-mode fiber by step 3, and fixedly becomes fibre bundle stiff end through binding solidification;
Step 4 is connected after being aimed at described multi-core fiber by described fibre bundle stiff end again, namely obtains described spatial reuse/demodulation multiplexer.
According to another aspect of the present invention, provide a kind of spatial reuse/demodulation multiplexer being applicable to multi-core fiber, it uses above-mentioned preparation method to be prepared, described N root single-mode fiber is made the conventional criteria joints of optical fibre without one end of corrosion, and one end that described multi-core fiber is not connected with described fibre bundle stiff end is used for carrying out welding with the multi-core fiber of link transmission.
In general, the above technical scheme conceived by the present invention compared with prior art, has following beneficial effect:
The present invention has wide range of applications, and being applicable to major part to need the occasion such as space division multiplexing transmission system of signal multiplexing/demultiplexing and distributed sensing system etc. based on multi-core fiber.The present invention can fast accurate by the corrosion of single-mode fiber glass-clad diameter to desired value, and the surface smoothness and homogeneity that are dissoluted optical fiber can be improved, improve the operability of thin optic fibre.Multiplexing demultiplexing device prepared by the inventive method has the advantages such as versatility is good, size is little, loss is low, flexible durable, to external world interference-tolerant degree are high, easy batch production, has more field conduct meaning.
Accompanying drawing explanation
Fig. 1 is the structural representation of the present invention seven core fibre multiplexing demultiplexing device coupling assembling;
Fig. 2 is the connection diagram of seven core fibre multiplexing demultiplexing devices of the embodiment of the present invention;
Fig. 3 be the present invention another execute the structural representation of three core fibre multiplexing demultiplexing devices of example.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.In addition, if below in described each embodiment of the present invention involved technical characteristic do not form conflict each other and just can mutually combine.
Figure 1 shows that the structural representation of the present invention seven core fibre multiplexing demultiplexing device coupling assembling, wherein 1 and 3 fibre cores representing fibre bundle and seven core fibres respectively, are homogeneity type; 2 is the single-mode fiber after chemical corrosion; 4 is seven core fibres for multiplexing demultiplexing device of the present invention after chemical corrosion; Solid line 6 and dotted line 5 represent the border after the original seven core fibre borders before chemical corrosion and chemical corrosion respectively.
In embodiments of the present invention, according to the size of multi-core optical fiber core distance, first with chemical corrosion method, the glass-clad of single-mode fiber one end is eroded to the core spacing equaling multi-core fiber.And then according to the fibre core distribution in multi-core fiber, same arrangement is carried out to the single-mode fiber corroded, single-mode fiber is according to arranging symmetrically around axle to be about to identical with multi-core optical fibre core number many (such as 7,3 or 19 etc.), and the most frequently used is pile up by hexagonal array to be put in glass capillary.Such as, the arrangement mode of seven core fibres, for have a fibre core in axle, to distribute 6 fibre cores symmetrically and evenly around this axle fibre core.Can also, at outer 12 fibre cores that distribute symmetrically and evenly again of 6 fibre cores of the second circle, make each root fibre core equal with the distance of the fibre core closed on most around it.The arrangement of three core fibres is the simplest, only equilateral triangle need be become to arrange around axle and axle is positioned at leg-of-mutton center.
This sentences 7 single-mode fibers is example.Glass-clad corrosion is immersed in low viscosity binder to the end face of the single-mode fiber of aimed dia, preferably selects viscosity lower than the binder of 100cps.Due to capillary action, binder can be inhaled in the gap of the single-mode fiber that these 7 glass-clad are corroded, and is aligned to closely together by the single-mode fiber of these 7 thin coverings of surface tension of binder.After binder dry solidification, make 7 single-mode fibers fixing in glass capillary, final glass kapillary end face uses mechanical buffing, namely obtains fibre bundle.
Figure 2 shows that the connection diagram of seven core fibre multiplexing demultiplexing devices of the embodiment of the present invention.7 is one end of the non-corrosion of single-mode fiber, is prepared into standard fiber optic connector according to actual needs; 8 for being integrated in 7 single-mode fibers after the corrosion in lock pin; 9 is seven core fibres after overall corrosion; 10 is original seven core fibres.In the application, 7 single-mode fibers 8 after integrated corrosion and seven core fibres 9 after overall corrosion are for be mechanically connected or matching fluid is connected, and seven core fibres 9 after overall corrosion and original seven core fibres 10 are welding.In the application, assembly 7,8,9 forms seven core fibre multiplexing demultiplexing devices jointly.Easy understand, at link transmission optical fiber, i.e. the other end of original seven core fibres 10, also need to configure a set of multiplexing demultiplexing device, its annexation is identical, and effect is easily by signal multiplexing and demultiplexing.In the application, the uncorroded end face of fibre bundle is connected with optical sender, the multi-core fiber of chemical corrosion and uncorroded multi-core fiber welding, after transmitting a segment distance, be connected with the multi-core fiber of chemical corrosion again, another end face of this multi-core fiber leads to and is connected with the corrosion end face of another fibre bundle, and its uncorroded fibre bundle end face is connected with photoreceiver, realizes the multiplexing of signal and demultiplexing.
Because the multi-core fiber of routine production is in order to suppress crosstalk between core, its diameter specifications is often large than the fibre bundle of many single-mode fibers compositions.Therefore to multi-core fiber used in multiplexing demultiplexing device of the present invention, in order to guarantee intactly to aim at the single-mode fiber through chemical corrosion in fibre bundle exactly, first by the method for chemical corrosion, the cladding diameter of multi-core fiber can be eroded to the size equal with fibre bundle as required if desired.Then fibre bundle with adopt active method of aiming in multi-core fiber alignment procedures, fibre bundle and multi-core fiber are put into and are equipped with on alignment tool that transverse direction and angle aim at, due to the core diameter size of single-mode fiber and multi-core fiber close, and the covering that single-mode fiber corroded is identical with multi-core optical fiber core distance, differentiate whether multi-core fiber and fibre bundle are aimed at by the size of monitoring fiber-optic output luminous power, if do not aim at, then add rotation process with three-D displacement platform and harmonize.Both index-matching fluid can have been adopted after aligning to connect, also can adopt physical connection method.
Spatial reuse/the demodulation multiplexer of embodiment 1: seven core fibre.
In embodiments of the present invention, choose a kind of seven core fibres of the glass-clad diameter transmitted 150 μm, get a bit of removal polymer coating by glass-clad corrosion to 125 μm, calculating its core spacing is 41 μm.
Get the standard single-mode fiber of the fibre core homogeneity of 7 core regions and this seven core fibre, remove the organism coating of its one end, dip in wipes of alcohol with dust-free paper to deluster fine glass-clad surface debris, HF (hydrofluorite) solution is immersed in 7 single-mode fiber glass-clad portions after clean simultaneously and carries out corrosion.Corrosion solution is generally HF or hot phosphoric acid, and that conventional is HF.The advantage of HF is that corrosion speed is very fast, normal temperature corrosion; And use phosphoric acid to heat, and speed is slow, does not generally adopt.The HF solution of two kinds of concentration is adopted to carry out substep corrosion: first to carry out quick corrosion by the comparatively strong solution that concentration is 39% ~ 45% and be greater than desired value about 5 μm to the remaining diameter of single-mode fiber glass-clad, wherein, this desired value is the core spacing 41 μm of seven core fibres, then carries out accurate corrosion to this desired value with the solution that concentration is 15%.In practical operation, when close to desired value, need the optical fiber that usually will carry out corrosion to take out, measure its diameter, until reach desired value with microscopic examination.Solution surface is coated with machine oil and produces injury to stop HF to volatilize to operator.And HF solution and the optical fiber that is immersed are placed in the service sink of supersonic wave cleaning machine, utilize ultrasound wave to carry out homogenizing HF solution thus improve the surface smoothness and the homogeneity that are dissoluted optical fiber.Test proves that the glass-clad length general control be dissoluted is at 6 to 15mm, and about comparatively suitable during 10mm, 7 single-mode fibers are dissoluted partial-length gap and are less than 2mm.Corrosion fixedly becomes fibre bundle stiff end to 7 single-mode fiber ends of aimed dia through binding solidification, to be that seven core fibres of 125 μm of glass-clad adopt matching fluid to be connected with the diameter that has after corrosion after this stiff end ground and cleaned again, its typical average junction loss is lower than 0.2dB, more excellent, lower than 0.1dB.Namely this web member becomes a kind of spatial reuse/demodulation multiplexer of seven core fibres.In the application, the free end of these 7 single-mode fibers is made the conventional criteria joints of optical fibre, carry out welding by seven core fibres after corrosion and between original seven core fibres with other heat sealing machines protected inclined heat sealing machine or have an axial adjustment function again, the average splice loss, splice attenuation of each fibre core is lower than 0.1dB.Also find in the application, the optical fiber after corrosion is very fragile, and expose in atmosphere or carry out piling up, very easily rupture in bunchy operating process, after carrying out surface enhanced process by aqueous solution, the operability of thin optic fibre can be improved a lot.The aqueous composition used comprises: silane coupling agent 0.5 ~ 1.2%, water-soluble epoxy resin 2 ~ 10%, surfactant 0.5 ~ 2% and amino plastifier 0.3 ~ 2.5%, wherein surfactant is polyoxyethylene ether or ester class.Preferably aqueous composition comprises: silane coupling agent 1%, water-soluble epoxy resin 5%, surfactant 1.5% and amino plastifier 1%, and wherein surfactant is polyoxyethylene ether or ester class.
Figure 3 shows that the structural representation of the three core fibre multiplexing demultiplexing devices of another embodiment of the present invention.Only be with the difference of above-mentioned seven core fibre multiplexing demultiplexing devices: the cladding diameter of three core fibres 13 that this multiplexing demultiplexing device is used equals the cladding diameter of original three core fibres 14, namely need not through corrosion; 11 is the single-mode fiber after chemical corrosion; 12 is the endoporus of corresponding lock pin.
Spatial reuse/the demodulation multiplexer of embodiment 2: three core fibre.
In embodiments of the present invention, the glass-clad diameter choosing a kind of link transmission is three core fibres of 125 μm, and calculating its core spacing is 72 μm.
Get the standard single-mode fiber of the fibre core homogeneity of 3 core regions and this three core fibre, remove the organism coating of its one end, dip in wipes of alcohol with dust-free paper to deluster fine glass-clad surface debris, HF solution is immersed in 3 single-mode fiber glass-clad portions after clean simultaneously and carries out corrosion.The HF solution of two kinds of concentration is adopted to carry out substep corrosion: first to carry out quick corrosion by the comparatively strong solution that concentration is 35% ~ 50% and be greater than desired value about 10 μm to the remaining diameter of single-mode fiber glass-clad, wherein, this desired value is the core spacing 72 μm of three core fibres, then carries out accurate corrosion to this desired value with the HF solution that concentration is 20%.Solution surface is coated with machine oil and produces injury to stop HF to volatilize to operator.And HF solution and the optical fiber that is immersed are placed in the service sink of supersonic wave cleaning machine, utilize ultrasound wave to carry out homogenizing HF solution thus improve the surface smoothness and the homogeneity that are dissoluted optical fiber.Test proves that the glass-clad length general control be dissoluted is at 6 to 15mm, and about comparatively suitable during 10mm, 3 single-mode fibers are dissoluted partial-length gap and are less than 2mm.Corrosion fixedly becomes fibre bundle stiff end to 3 single-mode fiber ends of aimed dia through binding solidification, optical fiber cold joint or matching fluid is adopted to be connected after this stiff end ground and cleaned with a bit of original three core fibres again, its typical average junction loss is lower than 0.15dB, more excellent, lower than 0.1dB.Namely this web member becomes a kind of spatial reuse/demodulation multiplexer of three core fibres.In the application, the free end of these 3 single-mode fibers is made the conventional criteria joints of optical fibre, other heat sealing machines again three core fibres of the free end of three core fibres and link transmission protected inclined heat sealing machine or have an axial adjustment function carry out welding, and the average splice loss, splice attenuation of each fibre core is lower than 0.1dB.In order to reduce fibercuts, increase the success ratio in operation, preferably cleaned to corrosion optical fiber carries out above-mentioned surface enhanced process.
In above-described embodiment alleged " homogeneity ", the composition structure for fibre core is identical or essence is identical, that is, core diameter is identical with numerical aperture NA or close, and its close degree is limited to connect the rear not serious signal transmission quality that affects.In actual applications, also homogeneity can be extended as the essence of fibre core composition structure is identical, that is, the close type communication optical fiber of the link transmission after textural difference does not affect welding all can be regarded as homogeneity; Such as, G.657 with have performance to be similar in each subclass of G.652 optical fiber or the part of parameter overlap all can directly be connected or welding uses, be interpreted as homogeneity.It is identical that the change not affecting Optical Fiber Transmission performance done the covering around fibre core also should be interpreted as essence.
Those skilled in the art will readily understand; the foregoing is only preferred embodiment of the present invention; not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. be applicable to a preparation method for the spatial reuse/demodulation multiplexer of multi-core fiber, it is characterized in that, comprising:
Step 1 calculates the core spacing of selected multi-core fiber, and the fibre core number of wherein said multi-core fiber is N;
Step 2 removes the organism coating of its one end of single-mode fiber of the fibre core homogeneity of N root and described multi-core fiber, the corrosion solution that the glass-clad of the described N root single-mode fiber after removal coating immerses concentration higher is simultaneously carried out quick corrosion, to the core spacing of its glass-clad diameter slightly larger than described multi-core fiber, again the described corrosion solution that the glass-clad of described N root single-mode fiber immerses concentration lower is simultaneously carried out accurate corrosion, equal described core spacing to its glass-clad diameter;
Same arrangement is carried out by the distribution of fibre core N number of in described multi-core fiber in one end after corrosion of described N root single-mode fiber by step 3, and fixedly becomes fibre bundle stiff end through binding solidification;
Step 4 is connected after being aimed at described multi-core fiber by described fibre bundle stiff end again, namely obtains described spatial reuse/demodulation multiplexer.
2. the method for claim 1, is characterized in that, the glass-clad cut to lengthen be dissoluted in described step 2 is at 6 to 15mm, and described N root single-mode fiber is dissoluted partial-length gap and is less than 2mm.
3. the method for claim 1, is characterized in that, the glass-clad cut to lengthen be dissoluted in described step 2 is at 10mm, and described N root single-mode fiber is dissoluted partial-length gap and is less than 2mm.
4. the method according to any one of claim 1-3, it is characterized in that, corrosion solution described in described step 2 is hydrofluoric acid solution, first carries out quick corrosion with the hydrofluoric acid solution that concentration is 35% ~ 50%, then carries out accurate corrosion with the hydrofluoric acid solution that concentration is 15% ~ 20%.
5. the method for claim 1, it is characterized in that, when described step 2 carries out corrosion, described corrosion solution and the optical fiber that is immersed all are placed in the service sink of supersonic wave cleaning machine, utilize ultrasound wave to carry out corrosion solution described in homogenizing, thus improve the surface smoothness and the homogeneity that are dissoluted optical fiber.
6. the method for claim 1, is characterized in that, described step 2 also comprises:
N root single-mode fiber aqueous solution after corrosion is carried out surface enhanced process, described aqueous composition comprises: silane coupling agent 0.5 ~ 1.2%, water-soluble epoxy resin 2 ~ 10%, surfactant 0.5 ~ 2% and amino plastifier 0.3 ~ 2.5%, and wherein surfactant is polyoxyethylene ether or ester class.
7. the method for claim 1, is characterized in that, described step 2 also comprises:
N root single-mode fiber aqueous solution after corrosion is carried out surface enhanced process, described aqueous composition comprises: silane coupling agent 1%, water-soluble epoxy resin 5%, surfactant 1.5% and amino plastifier 1%, and wherein surfactant is polyoxyethylene ether or ester class.
8. the method for claim 1, is characterized in that, in described step 4, the method that is connected with described multi-core fiber of described fibre bundle stiff end after aiming at is comprised index-matching fluid and to connect and physical method connects.
9. spatial reuse/demodulation multiplexer of preparing of the method for claim 1, it is characterized in that, described N root single-mode fiber is made the conventional criteria joints of optical fibre without one end of corrosion, and one end that described multi-core fiber is not connected with described fibre bundle stiff end is used for carrying out welding with the multi-core fiber of link transmission.
10. spatial reuse/demodulation multiplexer as claimed in claim 9, it is characterized in that, the average junction loss of described fibre bundle stiff end and described multi-core fiber is lower than 0.2dB, and the average splice loss, splice attenuation of each fibre core of the multi-core fiber of described multi-core fiber and link transmission is lower than 0.1dB.
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| WO2016137344A1 (en) * | 2015-02-28 | 2016-09-01 | Inphotech Sp. Z O. O. | Optical fiber coupler |
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| EP3562064A1 (en) * | 2018-04-27 | 2019-10-30 | Institut Mines-Telecom | Methods and devices for the determination of core dependent loss in multi-core fiber transmission systems |
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| CN112904485B (en) * | 2021-01-29 | 2021-12-14 | 东北大学 | Space division multiplexing/demultiplexing device for multi-core optical fiber and preparation method thereof |
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| CN113721323B (en) * | 2021-08-19 | 2023-07-14 | 天津大学 | Novel multi-core optical fiber coupling device and preparation method |
| CN114660707A (en) * | 2022-03-18 | 2022-06-24 | 武汉光迅科技股份有限公司 | Multi-core device and manufacturing method thereof |
| CN114690332A (en) * | 2022-04-19 | 2022-07-01 | 武汉光迅科技股份有限公司 | Multi-core contact pin, processing method and optical device |
| CN114879307A (en) * | 2022-05-17 | 2022-08-09 | 上海光织科技有限公司 | Multi-core optical fiber bridge fiber and connection method |
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