CN104503020A - Longitudinal spiral mode transfer optical fiber - Google Patents
Longitudinal spiral mode transfer optical fiber Download PDFInfo
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- CN104503020A CN104503020A CN201410798980.4A CN201410798980A CN104503020A CN 104503020 A CN104503020 A CN 104503020A CN 201410798980 A CN201410798980 A CN 201410798980A CN 104503020 A CN104503020 A CN 104503020A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/036—Optical fibres with cladding with or without a coating core or cladding comprising multiple layers
- G02B6/03694—Multiple layers differing in properties other than the refractive index, e.g. attenuation, diffusion, stress properties
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Abstract
The invention discloses a longitudinal spiral mode transfer optical fiber, which comprises a fiber core, a cladding and a coating layer; a silica material is taken as a substrate by the fiber core, and comprises at least one active ion and a co-doping agent; a plurality of side cores which surround the fiber core and are distributed in a longitudinal spiral structure are arranged in the cladding; the silica material is adopted by the side cores; each core diameter is at the micron dimension; the spiral cycle is at the millimeter dimension, and the edge-to-edge offset of the side core at the innermost layer and the edge-to-edge offset of the fiber core are at the micron dimension. According to the longitudinal spiral mode transfer optical fiber disclosed by the invention, as the spiral side cores with a loss mechanism are added to the cladding, the spiral side cores can be coupled with a higher order mode in the fiber core, and high loss is provided, and therefore single mode optical fiber transfer of large mode area is realized, and a new way is provided for the development of a high-power fiber laser.
Description
Technical field
The invention belongs to optics and laser optoelectronic technical field, more specifically, relate to a kind of longitudinal spiral mode shifts optical fiber.
Background technology
Fiber laser is developed rapidly because of unique advantages such as its high conversion efficiency, good cooling effect, high light beam quality and compact conformations, being widely used in the association areas such as optical communication, industrial processes, biologic medical, military and national defense, is the leading force in Laser Industry.
In recent years, the output power of fiber laser constantly rises, and reaches kW magnitude average power and MW magnitude peak power.But high-power Laser output can cause power density in fibre core too high, easily cause the nonlinear effects such as serious stimulated Raman scattering (SRS), stimulated Brillouin scattering (SBS) and optical fiber damage.
Prior art adopts big mode field area (Large Mode Area usually, LMA) optical fiber reduces fibre core power density, thus suppresses nonlinear effect, but this method can excite high-order mode (HigherOrder Mode, HOM), optical fiber output beam quality is caused to worsen.Initial people are by reducing fibre core numerical aperture (Numerical Aperture, NA) single mode running is realized, but being subject to the restriction of material character, the numerical aperture of ordinary optic fibre is difficult to drop to less than 0.05, and too low numerical aperture can aggravate bending loss of optical fiber.
Summary of the invention
For above defect or the Improvement requirement of prior art, the invention provides a kind of longitudinal spiral transfer optical fiber, its object is to the higher order mode in filtering big mode field area fiber core, the stable basic mode realizing big mode field area fibers exports, and solves in prior art the technical matters adopting big mode field area fibers reduction fibre core power density to cause beam quality to worsen.
For achieving the above object, the invention provides a kind of longitudinal spiral mode shifts optical fiber, comprise fibre core, the covering round fibre core, the coat round covering; The many side cores around the distribution of fibre core longitudinal spiral are arranged with in described covering; Higher order mode in fibre core to be shifted out to the coupling of side core, being coupled between side core with side core by fibre core, and the helical structure of side core provides high loss for the higher order mode be shifted out, and fibre core is transferred to the higher order mode filtering of side core, realizes optical fiber single-mode output.
Preferably, described optical fiber side core refractive index n
1with cladding index n
2relation should be met
higher order mode is better strapped in side in-core, and the many side cores distributed by longitudinal spiral are by higher order mode filtering.
Preferably, the core diameter size of many side cores of described optical fiber employing is different.
Preferably, the span of described side core core diameter is 6 μm ~ 15 μm, and spiralization cycle span is 4.5mm ~ 7mm, innermost layer side core and fibre core to while side-play amount span is 1 μm ~ 4.5 μm; According to the difference of helix parameter, the modal loss that side core provides is at 1dB/m ~ 100dB/m.
Preferably, described side core arrangement mode is that the side core individual layer of same size arranges around fibre core; Side core core diameter is 6 μm ~ 8 μm, and spiralization cycle is 4.5mm ~ 5.3mm, side core and fibre core to while side-play amount is 1 μm ~ 4.5 μm; Every bar side core in many side cored structures is all coupled with fibre core, accelerates the transfer of higher order mode to side core, by the out filtering in addition of the higher order mode fast transfer in fibre core.
Preferably, described side core arrangement mode is the side core of same size is that multilayer arranges around fibre core; Side core core diameter is 8 μm ~ 10 μm, and spiralization cycle is 5.1mm ~ 5.9mm, innermost layer side core and fibre core to while side-play amount is 1 μm ~ 4.5 μm; Each side core of internal layer all with fibre core generation coupling; Also there is coupling effect between internal layer side core and outer layer side core, the pattern in the core of internal layer side can be shifted, share internal layer side core provides high loss burden to pattern, by higher order mode filtering faster in the core of side.
Preferably, described side core arrangement mode is that the side core individual layer of different size is spaced around fibre core; Large scale side core core diameter is 10 μm ~ 13 μm, and small size side core core diameter is 6 μm ~ 8.3 μm, spiralization cycle 5.5mm ~ 6.2mm, side core and fibre core arrive while side-play amount 1 μm ~ 4.5 μm; Large-sized side core and fibre core coupling are stronger, effectively can shift the higher order mode in fibre core; The loss of core to higher order mode of undersized side is higher, the higher order mode be transferred in the core of large scale side coupling can be come and is provided higher loss, can higher order mode in the core of quicker filtering side.
Preferably, described side core arrangement mode is the side core of different size is that multilayer is spaced around fibre core; Large scale side core core diameter is 11 μm ~ 15 μm, and small size side core core diameter is 6 μm ~ 7.8 μm, and spiralization cycle is 6.1mm ~ 7mm, innermost layer side core and fibre core to while side-play amount is 1 μm ~ 4.5 μm; Each side core of internal layer all with fibre core generation coupling; Also there is coupling effect between internal layer side core and outer layer side core, the higher order mode in fibre core is shifted out; Large-sized side core and fibre core coupling are stronger, the higher order mode effectively in transfer fibre core; The loss of core to higher order mode of undersized side is higher, can higher order mode in the core of quicker filtering side.
Preferably, described fibre core is matrix with earth silicon material, and comprising at least one has source ion and co-dopant, described in have source ion to be La rear earth ion; Described co-dopant is one or more in Al ion, P ion and Ce ion; Described clad material is pure quartz; Described side core take earth silicon material as the passive fibre core of matrix, forms waveguiding structure together with described covering, has guide-lighting effect, but do not possess gain amplification performance; Described coat adopts polymer coating.
Preferably, also have one deck surrounding layer between the covering of described optical fiber and coat, described cladding refractive index, higher than cladding index and lower than coat refractive index, adopts polymer coating.
In general, the above technical scheme conceived by the present invention compared with prior art, can obtain following beneficial effect:
(1) many side cores introduced by optical fiber of the present invention in covering, being coupled of fibre core and each bar side core, the acting in conjunction that is coupled between side core with side core, by the higher order mode fast transfer in fibre core out, the helical structure of side core provides high loss for the higher order mode be shifted out, fibre core is transferred to the higher order mode filtering of side core, realize optical fiber single-mode output, improve output beam quality;
(2) in preferred version of the present invention, the core diameter size of many side cores is different, and slightly large-sized side core and fibre core coupling are stronger, effectively can shift the higher order mode in fibre core; The loss of core to higher order mode of undersized side is higher, the higher order mode be transferred in the core of large scale side coupling can be come and is provided higher loss, the higher order mode in the core of quicker filtering side; Higher order mode in fibre core, by quick filtering, realizes optical fiber single-mode output, and corresponding output beam quality is just improved;
(3), in preferred version of the present invention, adopt in the structure of individual layer many side cores, the higher order mode that every bar side core all can be coupled in fibre core, accelerates the transfer of higher order mode to side core; Adopt in the structure of multilayer side core, outer layer side core can shift the pattern in the core of internal layer side, thus shares internal layer side core provides high loss burden to pattern, makes higher order mode quick filtering in the core of side, realizes optical fiber single mode transport, improves output beam quality;
(4) because the pattern in optical fiber is very responsive to bending loss, its loss is understood along with the bending aggravation of waveguiding structure and constantly increases, therefore the longitudinal spiral structure that the side core in the present invention adopts is that the pattern in the core of side provides high loss, fibre core can be transferred to the higher order mode filtering of side core, just can realize optical fiber single-mode output without the need to any additional Mode Control Technology, improve output beam quality; This improvement is convenient to by fiber optic applications in complication system, is conducive to the integrated of fiber laser system;
(5) because each side core of many side cored structures of the present invention can provide bending loss to higher order mode, under the acting in conjunction of many side cores, the higher loss that side core can provide higher order mode, therefore in fiber preparation, when adopting many side cores, the spiralization cycle of side core can suitably increase, and can reduce the preparation difficulty of optical fiber;
(6) because the side in-core of the longitudinal spiral distribution of point invention is placed in covering, avoid the damage that conventional fiber brings optical fiber because bending radius is too small in coiling, improve optical fiber mode fields to distort serious problem, thus make output facula more symmetrical complete, improve beam quality;
(7) optical fiber of the present invention have the undistorted welding of pattern and compact disk around advantage, directly can mate with the associated op-tics prepared by treatment technology with the welding of employing standard fiber.
Accompanying drawing explanation
Fig. 1 is the change curve of longitudinal spiral mode shifts fiber core of the present invention modal loss with propagation constant difference Δ β;
Fig. 2 is the change curve of longitudinal spiral mode shifts optical fiber side core of the present invention modal loss with spiralization cycle;
Fig. 3 is the fiber end face schematic diagram of the embodiment of the present invention 1;
Fig. 4 is the fiber end face schematic diagram of the embodiment of the present invention 2;
Fig. 5 is the fiber end face schematic diagram of the embodiment of the present invention 3;
Fig. 6 is the fiber end face schematic diagram of the embodiment of the present invention 4;
Fig. 7 is the fiber end face schematic diagram of the embodiment of the present invention 5;
Fig. 8 is the optical fiber structure schematic diagram of the embodiment of the present invention 5.
In all of the figs, identical Reference numeral is used for representing identical element or structure, wherein: fibre core 101, around the covering 102 of fibre core, surrounding layer 103, coat 104, embodiment 1 side core 301, embodiment 2 ground floor side core 401 and second layer side core 402, embodiment 3 ground floor side core 501 and second layer side core 502, embodiment 4 first side core 601 and the second side core 602, embodiment 5 first side core 701, second side core 702, the 3rd side core 703, the 4th side core 704, the 5th side core 705, the 6th side core 706.
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.
Longitudinal spiral mode shifts optical fiber of the present invention, comprises fibre core, the covering round fibre core, the coat round covering, is arranged with the many side cores around the distribution of fibre core longitudinal spiral in covering.
According to Mode Coupling formula and quasi-phase matched condition, find through theory calculate and experiment, the propagation constant difference Δ β between the loss of fibre core pattern and the pattern be coupled has close relationship, and its loss declines along with the increase of Δ β, as shown in Figure 1; Setting coupling coefficient is 1, when Δ β=0, the loss of fibre core pattern reaches maximum, therefore, by the structural parameters of appropriate design longitudinal spiral mode shifts optical fiber, what comprise side core core diameter, spiralization cycle, innermost layer side core and fibre core arrives while side-play amount, can realize the low-loss of fibre core basic mode, the effect of high-order mode height loss.
Individual layer side core with size arranges around fibre core, the higher order mode that every bar side core all can be coupled in fibre core, under the individual layer side cored structure of described same size, optical fiber parameter is: side core core diameter 6 μm ~ 8 μm, spiralization cycle 4.5mm ~ 5.3mm, arriving while side-play amount 1 μm ~ 4.5 μm of side core and fibre core.
Side core with size is that multilayer arranges around fibre core, the higher order mode that innermost layer every bar side core all can be coupled in fibre core; Outer layer side core can shift the pattern in the core of internal layer side, thus in quickening fibre core, higher order mode is to the transfer of side core, and outer layer side core also can share internal layer side core provides high loss burden to pattern, makes higher order mode quick filtering in the core of side; Under described same size multilayer side cored structure, optical fiber parameter is: side core core diameter 8 μm ~ 10 μm, spiralization cycle 5.1mm ~ 5.9mm, arriving while side-play amount 1 μm ~ 4.5 μm of innermost layer side core and fibre core.
The individual layer side core of different size arranges around fibre core, the higher order mode that every bar side core all can be coupled in fibre core, slightly large-sized side core and fibre core coupling stronger, effectively can shift the higher order mode in fibre core, the loss of core to higher order mode of undersized side is higher, except the higher order mode in coupling fibre core, also the higher order mode be transferred in the core of large scale side coupling can be come and provided higher loss; Under the individual layer side cored structure of described different size, optical fiber parameter is: large scale side core core diameter is 10 μm ~ 13 μm, small size side core core diameter is 6 μm ~ 8.3 μm, and spiralization cycle is 5.5mm ~ 6.2mm, side core and fibre core to while side-play amount is 1 μm ~ 4.5 μm.
The side core of different size is that multilayer arranges around fibre core, the higher order mode that innermost layer every bar side core all can be coupled in fibre core, and outer layer side core can shift the pattern in the core of internal layer side, thus to accelerate in fibre core higher order mode to the transfer of side core; Slightly large-sized side core and fibre core coupling stronger, effectively can shift the higher order mode in fibre core, the loss of core to higher order mode of undersized side is higher, the higher order mode be transferred in the core of large scale side coupling can be come and provided higher loss, therefore better to the filtration result of higher order mode; Under the multilayer side cored structure of described different size, optical fiber parameter is: side core core diameter 11 μm ~ 15 μm, small size side core core diameter 6 μm ~ 7.8 μm, spiralization cycle 6.1mm ~ 7mm, arriving while side-play amount 1 μm ~ 4.5 μm of innermost layer side core and fibre core.
Because side core exists bowing factor, according to bending loss formula, show that higher order mode loss that side core provides is at 1dB/m ~ 100dB/m, between spiralization cycle and modal loss, curved line relation as shown in Figure 2.
Longitudinal spiral mode shifts optical fiber of the present invention is set forth further below in conjunction with specific embodiment and accompanying drawing.
The longitudinal spiral mode shifts optical fiber of embodiment 1 is double clad longitudinal spiral mode shifts silica fibre, comprises fibre core 101, covering 102, surrounding layer 103 and coat 104 round fibre core; As shown in Figure 3, evenly distributed in covering 102 have three around the side core 301 of fibre core longitudinal spiral distribution to its end view; From fiber end face, three side cores are evenly distributed on around fibre core 101 with equilateral triangle;
Wherein, fibre core 101 diameter is 37 μm, and numerical aperture is 0.06; Side core 301 core diameter is 7 μm, and numerical aperture is 0.1, and spiralization cycle is 4.5mm, and side core 301 is 1 μm with limit, the limit side-play amount of fibre core 101.
Fibre core 101 refractive index is 1.4582, and the material of employing is silica matrix, ytterbium ion and co-dopant Al ion and P ion; Covering 102 refractive index is 1.457, adopts pure quartz material; Side core 301 refractive index is 1.4604, and the material of employing is silica matrix and germanium ion; Surrounding layer 103 refractive index is 1.37, and the material of employing is the polymer coating of low-refraction; Coat 104 refractive index is 1.49, and the material of employing is the polymer coating of high index of refraction.
Empirical tests, the fundamental mode loss of the longitudinal spiral mode shifts optical fiber in example 1 is 0.15dB/m, and high-order mode loss is 53dB/m.
The longitudinal spiral mode shifts optical fiber of embodiment 2 is single covering longitudinal spiral transfer silica fibre, comprises fibre core 101, round the covering 102 of fibre core and coat 104; As shown in Figure 4, evenly distributed in covering 102 have the two-layer ground floor side core 401 of same size around the distribution of fibre core longitudinal spiral and second layer side core 402 to its end view; From fiber end face, two-layer side core 401 and 402 is evenly distributed on around fibre core 101 with regular hexagon.
Wherein, fibre core 101 diameter is 42 μm, and numerical aperture is 0.065; The core diameter of side core 401 and 402 is 10 μm, and numerical aperture is 0.13, and spiralization cycle is 5.7mm, and side core 401 is 2 μm with limit, the limit side-play amount of fibre core 101.
Fibre core 101 refractive index is 1.4584, and the material of employing is silica matrix, ytterbium ion and co-dopant Al ion and P ion; Covering 102 refractive index is 1.457, and material is pure quartz; Side core 401 and 402 refractive index is 1.4619, and material is silica matrix and germanium ion; Coat 104 refractive index is 1.49, adopts the polymer coating of high index of refraction.
Empirical tests, the fundamental mode loss of the longitudinal spiral mode shifts optical fiber in example 2 is 0.1dB/m, and high-order mode loss is 69dB/m.
The longitudinal spiral mode shifts optical fiber of embodiment 3 is that double clad longitudinal spiral mode shifts silica fibre comprises fibre core 101, covering 102, surrounding layer 103 and coat 104 round fibre core; As shown in Figure 5, evenly distributed in covering 102 have the two-layer ground floor side core 501 of 2 kinds of different sizes around the distribution of fibre core longitudinal spiral and second layer side core 502 to its end view; From fiber end face, two-layer side core 501 and 502 is evenly distributed on around fibre core 101 with regular hexagon.
Wherein, fibre core 101 diameter is 48 μm, and numerical aperture is 0.06; Side core 501 core diameter is 11 μm, and numerical aperture is 0.1, and the core diameter of side core 502 is 7.5 μm, and numerical aperture is 0.09, and spiralization cycle is 7mm, and side core 501 is 3 μm with limit, the limit side-play amount of fibre core 101.
The refractive index of fibre core 101 is 1.4582, and the material of employing is silica matrix, ytterbium ion and co-dopant Al ion, P ion and Ce ion; Covering 102 refractive index is 1.457, and material is pure quartz; Side core 501 and 502 material is silica matrix and germanium ion, and wherein side core 501 refractive index is 1.4604, and side core 502 refractive index is 1.4598; The refractive index of surrounding layer 103 is 1.37, adopts the polymer coating of low-refraction; Coat 104 refractive index is 1.49, adopts the polymer coating of high index of refraction.
Empirical tests, the fundamental mode loss of the longitudinal spiral mode shifts optical fiber in example 3 is 0.07dB/m, and high-order mode loss is 89dB/m.
The longitudinal spiral mode shifts optical fiber of embodiment 4 is double clad longitudinal spiral mode shifts silica fibre, comprises fibre core 101, covering 102, surrounding layer 103 and coat 104 round fibre core; Its end view as shown in Figure 6, first side core 601 and the second side core 602 of the evenly distributed 2 kinds of different sizes having one deck to distribute around fibre core longitudinal spiral in covering 102, from fiber end face, side core 601 and 602 is evenly distributed around fibre core 101 with regular hexagon.
Wherein, fibre core 101 diameter is 53 μm, and numerical aperture is 0.065; Side core 601 core diameter is 12 μm, and numerical aperture is 0.11, and the core diameter of side core 602 is 7.9 μm, and numerical aperture is 0.1, and spiralization cycle is 5.5mm, and limit, the limit side-play amount of side core 601 and 602 and fibre core 101 is 4.5 μm.
Fibre core 101 refractive index is 1.4584, and the material of employing is silica matrix, ytterbium ion and co-dopant Al ion, P ion and Ce ion; Covering 102 refractive index is 1.457, and material is pure quartz; Side core 601 and 602 component is silica matrix and has source ion germanium ion, and wherein side core 601 refractive index is 1.4611, and side core 602 refractive index is 1.4604; Surrounding layer 103 refractive index is 1.37, adopts the polymer coating of low-refraction; Coat 104 refractive index is 1.49, adopts the polymer coating of high index of refraction.
Empirical tests, the fundamental mode loss of the longitudinal spiral mode shifts optical fiber in embodiment 4 is 0.05dB/m, and high-order mode loss is 73dB/m.
The longitudinal spiral mode shifts optical fiber of embodiment 5 is double clad longitudinal spiral mode shifts silica fibre, and described optical fiber comprises fibre core 101, covering 102, surrounding layer 103 and coat 104 round fibre core; Its end view as shown in Figure 7, the first side core 701, second side core 702, the 3rd side core 703, the 4th side core 704, the 5th side core 705, the 6th side core 706 of the evenly distributed multiple different size having one deck to distribute around fibre core longitudinal spiral in covering 102.
Fig. 8 is fibre core and the side core arrangement architecture schematic diagram of embodiment 5 optical fiber, and side core is evenly arranged in fiber core, has identical spiralization cycle, along fibre core genesis analysis.
Wherein, core diameter is 59 μm, and numerical aperture is 0.07; The core diameter of side core 701 ~ 706 is 15 μm, 13 μm, 11 μm, 8 μm, 7 μm, 6 μm successively, numerical aperture is followed successively by 0.12,0.11,0.1,0.097,0.11,0.09, spiralization cycle is 7mm, and side core 701 ~ 706 is be 2.2 μm, 2.5 μm, 2.7 μm, 2.9 μm, 3.2 μm, 3.5 μm with limit, the limit side-play amount of fibre core 101 successively.
Fibre core 101 refractive index is 1.465, and the material of employing is silica matrix, ytterbium ion and co-dopant Al ion and P ion; Covering 102 refractive index is 1.457, and material is pure quartz; Side core 701 ~ 706 material is silica matrix and germanium ion, and wherein side core 701 ~ 706 refractive index is respectively 1.4619,1.4611,1.4604,1.4602,1.4611,1.4598; Surrounding layer 103 refractive index is 1.37, adopts the polymer coating of low-refraction; Coat 104 refractive index is 1.49, adopts the polymer coating of high index of refraction.
Empirical tests, the fundamental mode loss of the longitudinal spiral mode shifts optical fiber in embodiment 5 is 0.03dB/m, and high-order mode loss is 81dB/m.
The higher order mode loss of single side core shared by individual layer many sides core; Multilayer side cored structure is accelerated the transfer of higher order mode and is shared the higher order mode loss of single side core; Many side cores of different size can utilize large scale side core to accelerate higher order mode transfer, and small size side core realizes the quick filtering to higher order mode; Different size multilayer side cored structure combines above-mentioned advantage, and effect is better.The more than Comprehensive Correlation the result of 5 embodiments, can be informed in higher order mode in filtering fibre core thus promote on optical fiber output beam quality, experiment effect strengthens successively according to " with size individual layer side core < with size multilayer side core≤core < different size multilayer side, different size individual layer side core ".
Because higher order mode concentration of energy is in the marginarium of fibre core, and for being uniformly distributed, side core adopts evenly distributed structure, the higher order mode in fibre core can be shifted out completely; Side core adopts the structure of uneven arrangement, the following phenomenon of easy appearance: the fringe region higher order mode near the fibre core of side core is transferred to side core, and still there is higher order mode away from the fringe region of the fibre core of side core, higher order mode transfer not exclusively, in the effect improving beam quality, not as evenly distributed structure.
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. a longitudinal spiral mode shifts optical fiber, is characterized in that, described optical fiber comprises fibre core, the covering round fibre core, the coat round covering; The many side cores around the distribution of fibre core longitudinal spiral are arranged with in described covering; Being coupled of fibre core and each bar side core, be coupled by the higher order mode fast transfer in fibre core out between side core with side core, the helical structure of side core provides high loss for the higher order mode be shifted out, fibre core is transferred to the higher order mode filtering of side core, realizes optical fiber single-mode output.
2. optical fiber as claimed in claim 1, is characterized in that, described side core refractive index n
1with cladding index n
2meet relation
3. optical fiber as claimed in claim 1, is characterized in that, the core diameter size of described many side cores is different.
4. the optical fiber as described in claim 1 or 2 or 3, is characterized in that, the span of side core core diameter is 6 μm ~ 15 μm, and spiralization cycle span is 4.5mm ~ 7mm, innermost layer side core and fibre core to while side-play amount span is 1 μm ~ 4.5 μm.
5. optical fiber as claimed in claim 4, it is characterized in that, described side core arrangement mode is that the side core individual layer of same size arranges around fibre core; Side core core diameter is 6 μm ~ 8 μm, and spiralization cycle is 4.5mm ~ 5.3mm, side core and fibre core to while side-play amount is 1 μm ~ 4.5 μm.
6. optical fiber as claimed in claim 4, it is characterized in that, described side core arrangement mode is the side core of same size is that multilayer arranges around fibre core; Side core core diameter is 8 μm ~ 10 μm, and spiralization cycle is 5.1mm ~ 5.9mm, innermost layer side core and fibre core to while side-play amount is 1 μm ~ 4.5 μm.
7. the optical fiber as described in claim 3 or 4, is characterized in that, described side core arrangement mode is that the side core individual layer of different size is spaced around fibre core; Large scale side core core diameter is 10 μm ~ 13 μm, and small size side core core diameter is 6 μm ~ 8.3 μm, and spiralization cycle is 5.5mm ~ 6.2mm, side core and fibre core to while side-play amount is 1 μm ~ 4.5 μm.
8. the optical fiber as described in claim 3 or 4, is characterized in that, described side core arrangement mode is the side core of different size is that multilayer is spaced around fibre core; Large scale side core core diameter is 11 μm ~ 15 μm, and small size side core core diameter is 6 μm ~ 7.8 μm, and spiralization cycle is 6.1mm ~ 7mm, innermost layer side core and fibre core to while side-play amount is 1 μm ~ 4.5 μm.
9. the optical fiber as described in any one of claim 1 to 8, it is characterized in that, described fibre core take earth silicon material as matrix, comprise at least one and have source ion and co-dopant, described have source ion to be La rear earth ion, and described co-dopant is one or more in Al ion, P ion and Ce ion; Described clad material is pure quartz; Described side core adopts refractive index higher than the germanium-doped silica material of fibre core; Described coat adopts polymer coating.
10. the optical fiber as described in any one of claim 1 to 8, is characterized in that, also has one deck surrounding layer between the covering of described optical fiber and coat, and described cladding refractive index, higher than cladding index and lower than coat refractive index, adopts polymer coating.
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| CN105572793A (en) * | 2016-01-15 | 2016-05-11 | 中国科学院上海光学精密机械研究所 | Large mode field fiber with loss side core |
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| WO2021090913A1 (en) * | 2019-11-08 | 2021-05-14 | 株式会社フジクラ | Optical fiber |
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| CN109752790A (en) * | 2017-11-03 | 2019-05-14 | 桂林电子科技大学 | A kind of producible vortex light and the coaxial double wave guiding fiber of toroidal field and preparation method thereof |
| CN109752796A (en) * | 2017-11-03 | 2019-05-14 | 桂林电子科技大学 | Graded index rotational field optical fiber |
| CN109143462A (en) * | 2018-10-12 | 2019-01-04 | 西安邮电大学 | A kind of high birefringence dung beetle shape fibre core photonic crystal fiber |
| CN110456447A (en) * | 2019-08-17 | 2019-11-15 | 山东光韵智能科技有限公司 | A kind of waterproof fireproofing optical fiber and preparation method thereof and lighting system using the optical fiber |
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| JP7403574B2 (en) | 2019-11-08 | 2023-12-22 | 株式会社フジクラ | optical fiber |
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| WO2022085244A1 (en) * | 2020-10-19 | 2022-04-28 | 株式会社フジクラ | Optical fiber cable |
| JP7499867B2 (en) | 2020-10-19 | 2024-06-14 | 株式会社フジクラ | Fiber optic cable |
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