CN109633828B - Mounting structure of multicore fiber array - Google Patents
Mounting structure of multicore fiber array Download PDFInfo
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- CN109633828B CN109633828B CN201910131085.XA CN201910131085A CN109633828B CN 109633828 B CN109633828 B CN 109633828B CN 201910131085 A CN201910131085 A CN 201910131085A CN 109633828 B CN109633828 B CN 109633828B
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- 239000000835 fiber Substances 0.000 title description 46
- 239000013307 optical fiber Substances 0.000 claims abstract description 93
- 230000000694 effects Effects 0.000 claims abstract description 6
- 238000009434 installation Methods 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 238000004891 communication Methods 0.000 description 5
- 238000003491 array Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 4
- 238000005253 cladding Methods 0.000 description 4
- 230000003287 optical effect Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 229920002120 photoresistant polymer Polymers 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000005374 Kerr effect Effects 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000000881 depressing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Classifications
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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
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
- G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
- G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
-
- 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
- G02B6/3628—Mechanical coupling means for mounting fibres to supporting carriers
- G02B6/3632—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means
- G02B6/3636—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves
- G02B6/364—Mechanical coupling means for mounting fibres to supporting carriers characterised by the cross-sectional shape of the mechanical coupling means the mechanical coupling means being grooves inverted grooves, e.g. dovetails
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Mechanical Coupling Of Light Guides (AREA)
Abstract
The invention discloses a mounting structure of a multi-core optical fiber array, which comprises a V-shaped groove, multi-core optical fibers arranged in the V-shaped groove and a cover plate covered on the notch of the V-shaped groove, wherein the multi-core optical fibers are simultaneously pressed on the inner walls of the two sides of the V-shaped groove through the cover plate, the opening angle of the V-shaped groove is 100-120 degrees, and the offset angle of the optical fibers is 0.7-0.8 degrees. The V-shaped groove is used for positioning the multi-core optical fiber so as to provide a certain activity allowance for the multi-core optical fiber, and then the position of the multi-core optical fiber in the V-shaped groove is adjusted through the cover plate. The limit adjusting position of the multi-core optical fiber in the V-shaped groove can be determined by the opening angle of the V-shaped groove by the cover plate. In order to try to reduce the offset angle of the optical fiber, the opening angle of the V-shaped groove needs to be as large as possible, so that the rotation allowance of the multi-core optical fiber is improved, and the levelness of the multi-core optical fiber can be controlled through the cover plate as much as possible. But also in order to ensure that the two sides of the multi-core optical fiber are firmly pressed on the inner walls of the two sides of the V-shaped groove at the same time, so as to ensure the positioning effect of the inner walls of the V-shaped groove on the multi-core optical fiber.
Description
[ Field of technology ]
The invention relates to a mounting structure of a multi-core optical fiber array, and belongs to the field of optical fibers.
[ Background Art ]
Current fiber optic communication networks are growing in traffic at high rates of 20% -60%. The port rate of the optical communication system has reached 100Gb/s, the system capacity has reached 10Tb/s, and in the next ten years, the capacity of the optical communication system will reach about 100 Tb/s. However, there are several limitations to current fiber optic communication systems: first, the useful spectral efficiency is only about 10THz in combination with the low loss transmission window and the amplifier bandwidth; second, the signal is subject to degradation of the optical signal-to-noise ratio due to spontaneous emission noise (ASE) of the amplifier during optical fiber transmission, and nonlinear impairments due to nonlinear kerr effects of the optical fiber, so that the system capacity has nonlinear shannon limits, i.e., the transmission quality of the high-spectral-efficiency signal is improved by improving the signal-to-noise ratio, which can produce very serious nonlinear distortion. Space Division Multiplexing (SDM) based on multicore and few-mode fibers is a necessary choice to break through the capacity limitations of fiber optic communication systems. The multi-core optical fiber has wider application prospect, but the multi-core optical fiber needs to be packaged in a space alignment mode, and then the multi-core optical fiber needs to be applied to the multi-core optical fiber array to be connected with the multi-core optical fiber to form an end or be coupled with a joint.
Fiber Array english name Fiber Array, FA for short. The optical device is formed by arranging and fixing optical fibers according to a certain interval, and is a channel of a light inlet and outlet device. Fiber arrays are classified into single core fiber arrays (SFAs) (although there is only one fiber, also referred to as arrays) and multi-core fiber arrays (MFAs). The array (MFA) of multi-core fibers is composed of multi-core fibers and fixing grooves for fixing the multi-core fibers, wherein the multi-core fibers are divided into two types, one type is a plurality of separate single-core fibers, each core has a fiber core and a cladding which are independent, and the other type is a multi-core fiber (MCF) in which a plurality of fiber cores exist in a common cladding region.
The concept of a multi-core fiber having multiple cores in the same cladding region was proposed by french telecommunications in 1994, and the density of the multi-core fiber cable was improved many times as compared to a common single-core fiber. Currently, the transmission capacity of a single optical fiber has become a bottleneck, and further expansion of the capacity must be considered to change a single-core optical fiber into a multi-core optical fiber with multiple cores, i.e. a multi-core optical fiber with multiple cores in one cladding.
In addition, when coupling, the V-groove is a very useful optical fiber positioning means, the optical fiber ribbon optical fiber and the single-core optical fiber are generally fixed, so long as the V-groove meets the requirement, the left-handed or right-handed optical fiber can not have fatal influence on the whole fixation, but the multi-core optical fiber is not.
[ Invention ]
The invention aims to solve the technical problem of overcoming the defects of the prior art and providing an adjustable multi-core optical fiber array mounting structure.
The technical problems are solved, and the invention adopts the following technical scheme:
The utility model provides a mounting structure of multicore optic fibre array, includes V type groove, sets up multicore optic fibre in V type inslot and the apron of lid at V type groove notch, multicore optic fibre compresses tightly simultaneously on the both sides inner wall of V type groove through the apron, and the open angle of V type groove is 100 ~120, and the optical fiber offset angle is 0.7-0.8 degree.
The beneficial effects of the invention are as follows:
the V-shaped groove is used for positioning the multi-core optical fiber so as to provide a certain activity allowance for the multi-core optical fiber, and then the position of the multi-core optical fiber in the V-shaped groove is adjusted through the cover plate. The limit adjusting position of the multi-core optical fiber in the V-shaped groove can be determined by the opening angle of the V-shaped groove by the cover plate. In order to try to reduce the offset angle of the optical fiber, the opening angle of the V-shaped groove needs to be as large as possible, so that the rotation allowance of the multi-core optical fiber is improved, and the levelness of the multi-core optical fiber can be controlled through the cover plate as much as possible. But also in order to ensure that the two sides of the multi-core optical fiber are firmly pressed on the inner walls of the two sides of the V-shaped groove at the same time, so as to ensure the positioning effect of the inner walls of the V-shaped groove on the multi-core optical fiber.
The side wall extruded by the multi-core optical fiber and the inner wall of the V-shaped groove is an arc surface.
The friction coefficient between the multi-core optical fiber and the inner wall of the V-shaped groove is 0-0.45.
The cambered surface is an arc surface.
Other features and advantages of the present invention will be disclosed in the following detailed description of the invention and the accompanying drawings.
[ Description of the drawings ]
The invention is further described with reference to the accompanying drawings:
FIG. 1 is a schematic front view of a mounting structure of a single-core optical fiber according to embodiment 1 of the present invention;
Fig. 2 is a schematic front view (before adjustment) of the installation structure of the multi-core optical fiber array according to embodiment 2 of the present invention;
FIG. 3 is a diagram illustrating a stress analysis of a mounting structure of a multi-core fiber array according to embodiment 2 of the present invention;
FIG. 4 shows the opening angle and the opening angle of the V-shaped groove according to embodiment 2 of the present invention Is a functional relationship diagram of (2);
FIG. 5 shows the V-shaped groove cutting angle of example 2 of the present invention, And μ;
Fig. 6 is a schematic front view (after adjustment) of the installation structure of the multi-core fiber array according to embodiment 2 of the present invention.
[ Detailed description ] of the invention
The technical solutions of the embodiments of the present invention will be explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the examples in the implementation manner, other examples obtained by a person skilled in the art without making creative efforts fall within the protection scope of the present invention.
In the following description, directional or positional relationships such as the terms "inner", "outer", "upper", "lower", "left", "right", etc., are presented for convenience in describing the embodiments and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the invention.
Example 1:
Referring to fig. 1, the conventional installation structure of a single-core optical fiber includes a V-groove 1, a single-core optical fiber 3 disposed in the V-groove 1, and a cover plate 2 covering the notch of the V-groove 1.
Before installing the cover plate 2, the single-core optical fiber 3 is first required to be placed in the V-shaped groove 1, and the single-core optical fiber 3 can automatically roll to the bottom of the V-shaped groove 1 due to the action of gravity, so that the single-core optical fiber 3 is simultaneously supported on two side walls of the V-shaped groove 1, and the single-core optical fiber 3 is in a highly symmetrical cylindrical shape, so that no fatal influence can occur on the position of the single-core optical fiber 3 in the V-shaped groove 1 no matter the single-core optical fiber 3 is left-handed or right-handed. And then covering the notch of the V-shaped groove 1 with a cover plate 2, fixing the cover plate 2 by using photoresist, and simultaneously positioning the single-core optical fiber 3 by using the cover plate 2, wherein the single-core optical fiber 3 can still rotate in the V-shaped groove 1.
Example 2:
Referring to fig. 2-6, the present embodiment shows a mounting structure of a multicore fiber array, including a V-groove 1, multicore fibers 4 disposed in the V-groove 1, and a cover plate 2 covering the notch of the V-groove 1, where the multicore fibers 4 are simultaneously pressed on inner walls of both sides of the V-groove 1 by the cover plate 2. Since the cross-sectional shape of the multicore fiber 4 is a non-centrosymmetric pattern, the multicore fiber 4 is not likely to rotate in the V-groove 1.
Before the cover plate 2 is installed, the multi-core optical fiber 4 is placed into the V-shaped groove 1, the multi-core optical fiber 4 can be automatically supported on the inner walls of the two sides of the V-shaped groove 1 under the action of self gravity, the supporting forces of the inner walls of the two sides of the V-shaped groove 1 on the multi-core optical fiber 4 are respectively F 1 and F 2, and the friction forces are respectively F 1μ, F 2μ,F1、F2、F1μ and F 2μ and the gravity of the multi-core optical fiber 4 reach an equilibrium state. At this time, the included angle between the planes of all the cores in the multi-core optical fiber 4 and the horizontal plane isThen the cover plate 2 is pressed down, so that the cover plate 2 applies vertical downward pressure F 0 to the highest point of the multi-core optical fiber 4, and the multi-core optical fiber 4 is driven to rotate in the V-shaped groove 1 by the pressure F 0, thereby further enabling the multi-core optical fiber 4 to rotateReduced to 0 ° as much as possible by depressing the cover plate 2Minimum value achieved/>Namely the offset angle of the optical fiber,The smaller the size, the better the levelness of the corresponding multicore fiber 4, and then the cover plate 2 is fixed through the photoresist, and at the moment, the multicore fibers 4 are also fixed in the V-shaped groove 1.
In particular by what parametersIt is not clear that for this embodiment, an installation experiment of the multicore fibers 4 of the same specification by different V-grooves 1 was tried to investigate the pair/>, of V-grooves 1In order to reduce the variation, the V-grooves 1 in the present embodiment are all symmetrical structures, and studies are performed through V-grooves 1 with different angles. Since the V-groove 1 needs to position the multicore fiber 4, if the opening angle of the V-groove 1 is too small, the multicore fiber 4 may not be plugged into the V-groove 1, so the minimum opening angle of the V-groove 1 is set to 40 °.
When the opening angle is 40,Is 1.8 DEG, with the opening angle gradually increasing,/>Gradually decreasing, when the opening angle is 120 degrees,Only 0.7 degrees is required to meet the levelness requirement of the actual multi-core fiber 4. An opening angle of between 40 DEG and 60 DEG/>The difference of (2) is as high as 0.5 DEG, and the opening angle is between 60 DEG and 80 DEG/>The difference in (2) drops to 0.3 DEG, the opening angle is between 80 DEG and 100 DEG/>The difference in (2) drops to 0.2 DEG, whereas the opening angle is between 100 DEG and 120 DEG/>The difference between (2) is reduced to 0.1 DEG, and it is found that/(The minimum value of (2) is only slightly lower than about 0.7 deg.. In other words, the opening angle influence/>And is a nonlinear negative correlation. Before the opening angle reaches 180 DEG,/>Can be achieved almost at the same time/>Is not 0 deg.. Meanwhile, the situation that the opening angle is too large is considered, the V-shaped groove 1 lacks of positioning effect on the multi-core optical fiber 4, and the optimal value of the opening angle of the V-shaped groove is 100-120 degrees, and the offset angle of the V-shaped groove relative to the V-shaped groove is 0.7-0.8 degrees according to the experimental result.
Furthermore, since the rotation process of the multicore fiber 4 is involved in the pressing down process of the cover plate 2, the friction coefficient μ between the multicore fiber 4 and the inner wall of the V-groove 1 is correspondingly affected, and the smaller μ is, the easier the corresponding multicore fiber 4 rotates.Is the included angle between the multicore fiber 4 and the horizontal plane before being pressed down by the cover plate 2,/>It is difficult for the cover plate 2 to rotate the multi-core optical fiber 4 in case of excessive size, and for this reason,/>, in case of fixed opening angle θ and friction coefficient μThe maximum allowed is/>In this embodiment, the friction coefficient is different for different grooving anglesStudies were performed. Experiments show that the smaller mu is corresponding to/>, under the condition of the same theta valueThe larger the corresponding cover plate 2 is, the more the multi-core optical fiber 4 can be adjusted. The larger the value of θ is/>, for the same μ valueThe larger, i.e. large open angle V-groove 1 allows a larger tuning range for the multi-core fiber 4.
Taking μ=0.3 as an example,Approximately linear increases in the range of 55 ° -75 ° of θ, whereas/>, at θ=75°The growth rate with increasing θ decreases significantly, but θ ranges from 75 ° -112 °/>And still linearly increases with θ, while at θ between 112 ° -120 °/>The increase is linear with θ, but the increase rate increases slightly over the range of 75 ° -112 ° compared to θ. θ -/>, in other μ valuesBoth the inflection points are gradually moved to the right along with the increase of the mu value, so that the independent influence of mu and theta on/>, except the independent influence of mu and theta, can be seenIn addition, there is a cross influence between them, in other words, the smaller μ and θ, the larger the tunable range of the cover plate 2 to the multicore fiber 4.
In addition, it can be seen in the figure that μ=0.5, θ is in the range of 100 ° -108 °All 0 deg., and therefore little adjustment capability. For this reason, when the optimum value of θ is 100 ° -120 °, μ is in the range of 0 to 0.45. Of course, if μ=0.5, θ takes the value 108 ° to 120 °. If μ is further increased to be larger than 0.5, the optimum value range of θ is further reduced, or even no optimum value range.
In addition, in order to reduce the μ value, the sidewalls of the multicore fiber 4 pressed against the inner wall of the V-groove 1 are cambered surfaces. Meanwhile, in order to improve the symmetry of the multi-core optical fiber 4 during rotation, the multi-core optical fiber 4 is selected to be a double-D-shaped optical fiber, and the corresponding cambered surface is an arc surface so as to improve the symmetry of the multi-core optical fiber 4.
While the invention has been described in terms of embodiments, it will be appreciated by those skilled in the art that the invention is not limited thereto but rather includes the drawings and the description of the embodiments above. Any modifications which do not depart from the functional and structural principles of the present invention are intended to be included within the scope of the appended claims.
Claims (3)
1. The method for installing the multi-core optical fiber array is characterized by comprising the following steps of: placing the multi-core optical fiber into a V-shaped groove, wherein the cross section of the multi-core optical fiber is in an asymmetric pattern, the multi-core optical fiber is automatically supported on the inner walls of the two sides of the V-shaped groove under the action of self gravity, the multi-core optical fiber is positioned by adopting the V-shaped groove to provide the activity allowance of the multi-core optical fiber, and then the cover plate is pressed down, so that the cover plate applies vertical downward pressure to the highest point of the multi-core optical fiber to drive the multi-core optical fiber to rotate in the V-shaped groove, thereby adjusting the position of the multi-core optical fiber in the V-shaped groove, wherein the opening angle of the V-shaped groove is 100-120 degrees, and the friction coefficient between the multi-core optical fiber and the inner wall of the V-shaped groove is 0-0.45 degree, so that the cover plate can finally adjust the optical fiber offset angle of the multi-core optical fiber to 0.7-0.8 degrees, and the installation structure of the multi-core optical fiber array is obtained;
the installation structure of the multi-core optical fiber array comprises a V-shaped groove, multi-core optical fibers arranged in the V-shaped groove and a cover plate covered on the notch of the V-shaped groove, wherein the multi-core optical fibers are simultaneously pressed on the inner walls of the two sides of the V-shaped groove through the cover plate.
2. The method of installing a multi-core optical fiber array according to claim 1, wherein: the side wall extruded by the multi-core optical fiber and the inner wall of the V-shaped groove is an arc surface.
3. The method of installing a multi-core optical fiber array according to claim 2, wherein: the cambered surface is an arc surface.
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| CN201910131085.XA CN109633828B (en) | 2019-02-21 | 2019-02-21 | Mounting structure of multicore fiber array |
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| CN201910131085.XA CN109633828B (en) | 2019-02-21 | 2019-02-21 | Mounting structure of multicore fiber array |
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| CN109633828B true CN109633828B (en) | 2024-05-14 |
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