CN111897046A - Multi-core optical fiber convenient to identify and butt joint - Google Patents
Multi-core optical fiber convenient to identify and butt joint Download PDFInfo
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- CN111897046A CN111897046A CN202010985340.XA CN202010985340A CN111897046A CN 111897046 A CN111897046 A CN 111897046A CN 202010985340 A CN202010985340 A CN 202010985340A CN 111897046 A CN111897046 A CN 111897046A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 33
- 210000001503 joint Anatomy 0.000 title claims abstract description 8
- 239000000835 fiber Substances 0.000 claims abstract description 174
- 238000005253 cladding Methods 0.000 claims abstract description 33
- 230000000994 depressogenic effect Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 abstract description 6
- 239000011159 matrix material Substances 0.000 description 11
- 239000010410 layer Substances 0.000 description 8
- 238000004891 communication Methods 0.000 description 6
- 230000005540 biological transmission Effects 0.000 description 5
- 239000012792 core layer Substances 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000003550 marker Substances 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000007847 structural defect Effects 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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02042—Multicore optical fibres
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Abstract
The invention relates to a multi-core optical fiber convenient for identification and butt joint, which comprises a common outer cladding layer and fiber cores arranged in the common outer cladding layer at intervals, wherein the fiber cores are arranged on the radial section of the multi-core optical fiber to form a fiber core lattice. The fiber core lattice of the invention is based on a symmetrical fiber core lattice, and the fiber core can have various shape arrangement schemes according to requirements. The invention has the advantages that the position of each fiber core of the multi-core fiber can be identified, and the distinguishing of the receiving and sending of the multi-core fiber is facilitated, thereby facilitating the butt joint between the multi-core fibers, the multi-core fiber and an optical device and the like.
Description
Technical Field
The invention relates to a multi-core optical fiber convenient to identify and butt joint, and belongs to the field of optical communication transmission.
Background
In recent years, with the rise of cloud computing, big data and mobile internet, a data center with efficient collaboration among servers and data processing capability becomes an obvious hotspot for increasing the total information amount and information density, so that an urgent requirement is put on the improvement of the interconnection communication rate of the data center. Because the data center interconnection communication has the characteristics of numerous equipment, complex wiring, high interface density and the like, the cost, the power consumption, the complexity and the like of system operation or maintenance are increased by only increasing the modulation bandwidth of devices and increasing the number of optical fiber links or light sources with different stable wavelengths.
In recent years, the international academia has proposed a way of using SDM to solve the above technical problem. There are two modes for space division multiplexing, one is mode multiplexing, that is, a few-mode optical fiber is used, and more than 2 modes are transmitted by using one optical fiber to realize multiplexing, thereby increasing the system capacity. The other is spatial multi-core multiplexing, that is, a new transmission technology for realizing multiplexing by using an optical fiber with a plurality of single-mode cores in a single optical fiber. There have been proposed several kinds of multi-core fibers divided into 4-core, 7-core, 10-core, 12-core and 19-core fibers by the number of cores in a single fiber, and the like. Each core in a multi-core fiber is an independent optical waveguide, and theoretically, the total transmission capacity of the system can be enlarged by N times by N cores in the multi-core fibers correspondingly.
In the 2011 conference on OFC, the OFS company in the United states reported that 56Tb/s signal transmission was achieved in 7-core fiber. In the same year, the NICT of Japan and the Sumitomo of Japan realize the signal transmission of 109Tb/s in the 7-core optical fiber, which is the first transmission experiment that a single optical fiber exceeds 100 Tb/s. At the international conference of 2012, NICT in japan first reported that transmission of over 305Tb/s was achieved over 19-core fiber. In the ECOC conference of the same year, a signal transmission experiment of more than 1Pb/s is realized in a 12-core multi-core optical fiber reported in Japan, and technical reserve is provided for the capacity expansion of a future communication network. In the 2013 OFC conference, it is first reported that a 7-core optical fiber is used for the construction of a data center and is used as a high-speed computer for high-height and high-density parallel interconnection. The existing multi-core optical fibers are applied to the fields of data centers, communication lines, high-speed communication local area connection and the like.
In practical application, when the multi-core fiber needs to identify the receiving and sending cores, or is connected with other multi-core fibers, optical devices and the like, a specific core of the multi-core fiber needs to be connected with a specified core of the other multi-core fiber and the optical device, however, the fiber cores of most of the multi-core fibers at present are arranged at equal intervals, or are arranged in an axisymmetric or rotationally symmetric manner, and the distribution has the advantages of ensuring the uniformity of the core intervals, being beneficial to fiber preparation and controlling crosstalk among the cores, but having the problem that each specific fiber core is difficult to identify.
Some of the current patents mention some solutions, but all have some limitations. As described in patent documents CN102257415B and CN102449515B, a visual recognition marker for recognizing the position of a specific core is additionally added to a fiber cladding, and the visual recognition marker is provided at a position where the symmetry of a multicore fiber is broken. However, these patents set a number of limitations on the marking core, CN102257415B requiring marking as a void and CN102449515B requiring that at least a portion of the visual identification marking have a higher refractive index than the cladding. The method described in patent document CN202433554U is for an air hole assisted optical fiber, in which the peripheral air hole layer of a part of the core has a different thickness or density from the air hole layer of the other core, and thus is used as a mark for identification, but if the air hole density or thickness is not uniform, the air hole may collapse, crack, merge or disappear during drawing the optical fiber, which causes structural defects and difficulty in identification of the optical fiber.
Disclosure of Invention
For convenience in describing the summary of the invention, the following terms are defined:
effective area of each mode of the fiber:
where E is the electric field associated with propagation and r is the distance from the axis to the point of electric field distribution.
The invention aims to solve the problem of providing a multi-core optical fiber convenient to identify and butt joint aiming at the defects in the prior art, and the multi-core optical fiber has the characteristics of easy identification and convenient use.
The technical scheme adopted by the invention for solving the problems is as follows: the fiber core is arranged on the radial section of the multi-core fiber to form a fiber core lattice, and the fiber core lattice is characterized in that the fiber core lattice is an asymmetric fiber core lattice, or is a fiber core lattice with a different structure and asymmetrically arranged, or is the combination of the two structures.
According to the scheme, the asymmetric fiber core dot matrix is formed by adding or removing at least one fiber core at an asymmetric position of the symmetric fiber core dot matrix or shifting at least one fiber core in the symmetric fiber core dot matrix to the asymmetric position, and the asymmetric position comprises an asymmetric position in the fiber core dot matrix or outside the dot matrix.
According to the scheme, the core lattice with the different-structure fiber core in the asymmetric arrangement mode is the fiber core with the different-structure in the symmetric fiber core lattice in the asymmetric arrangement mode.
According to the scheme, the symmetrical fiber core dot matrix comprises a circumferential fiber core dot matrix, a regular polygonal fiber core dot matrix or a rectangular fiber core dot matrix, the fiber cores are uniformly distributed in the fiber core dot matrix at equal intervals, and the centers of the fiber core dot matrix and the common outer cladding layer are overlapped.
According to the scheme, the fiber core comprises a core layer and a cladding, and the fiber core with the different structure has different core layer and/or cladding waveguide structures.
According to the scheme, the cladding is an inner cladding, or the inner cladding and the sunken cladding, and the outer cladding is a common outer cladding.
According to the scheme, the effective area of each fiber core at 1310nm is 50.01～75.01μm2And are different from each other. The minimum value of the effective area of each core at 1310nm is defined as d (mum)2) And the distance a between the fiber core and the adjacent fiber core is additionally arranged at the asymmetric position of the symmetric fiber core lattice to satisfy the following conditions:
the invention has the beneficial effects that: 1. the position of each fiber core of the multi-core fiber can be conveniently identified, the identification of the receiving and sending cores of the multi-core fiber is facilitated, and therefore the butt joint between the multi-core fibers, the multi-core fiber and an optical device and the like is facilitated. 2. The fiber core lattice of the invention is based on a symmetrical fiber core lattice, the fiber core can have various shape arrangement schemes according to requirements, and the mode field areas of the fiber cores are different, thereby effectively inhibiting the crosstalk among the cores, and ensuring that the comprehensive performances of the crosstalk of the optical fiber, the attenuation of each channel, the macrobending loss, the microbending loss and the like are in good levels while the multi-core optical fiber keeps higher space division multiplexing dimension density.
Drawings
Fig. 1 and fig. 2 are schematic radial structures of 2 embodiments of the asymmetric core lattice structure according to the present invention.
Fig. 3 and 4 are schematic radial structures of 2 embodiments of the core lattice structure with asymmetric arrangement of cores with different structures according to the present invention.
Fig. 5 is a schematic view showing a radial structure of a5 th embodiment of the present invention, and fig. 6 is a schematic view showing a comparative example of fig. 5.
Fig. 7 and 8 are schematic radial structures of the 6 th and 7 th embodiments of the present invention, respectively.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1:
as shown in FIG. 1, the asymmetric fiber core lattice structure comprises a common outer cladding layer and 8 fiber cores arranged in the common outer cladding layer at intervals, wherein the effective area of the 8 fiber cores is 51.17-57.23 μm2The fiber cores are arranged on the radial section of the multi-core fiber to form a fiber core lattice, the fiber core lattice is a2 x 4 rectangular fiber core lattice, one fiber core 11 on the left side in the symmetrical fiber core lattice is shifted to an asymmetrical position outside the fiber core lattice, the 2 x 4 rectangular symmetrical distribution structure of 8 cores is broken, and the fiber cores 11 are easily identified due to the position shift of the fiber cores, so that the positions of the fiber cores 21, 22, 23, 24, 25, 26 and 27 are smoothly located, and the purpose of identifying all the fiber cores is achieved.
Example 2:
as shown in FIG. 2, the asymmetric core lattice structure is a circumferential core lattice, and comprises 8 cores and 1 common outer cladding, wherein the effective areas of the 8 cores are 53.56-59.72 μm2And different, wherein 7 fiber cores are equidistantly and uniformly distributed on a circumference, the center of the circular fiber core lattice coincides with the center of the common outer cladding layer, one fiber core 8 positioned at the central position deviates to the asymmetric position outside the fiber core lattice, and the distances from the fiber core to the adjacent fiber cores 1, 2 and 3 are different, namely R1 is not equal to R2 is not equal to R3, so that the fiber cores 1, 2 and 3 can be positioned, and other fiber cores 4, 5, 6 and 7 can be identified.
Example 3:
as shown in fig. 3, the core lattice structure is an asymmetric arrangement of cores with different structures, the core lattice is a2 × 4 rectangular core lattice, 1 common outer cladding, and the effective area of 8 cores is 50.56-63.38 μm2The first fiber core A and the second fiber core B are different fiber cores with different structures, the upper row of the fiber core A1 on the left side in the symmetrical fiber core lattice is set as the first waveguide structure fiber core, and the fiber cores B1, B2, B3, B4, B5, B6 and B7 in the rest fiber core lattices are the second waveguide structure fiber cores, that is, the different fiber cores are asymmetrically distributed in the symmetrical fiber core lattice. The core A1 can be distinguished from the four same spatial positions (A1, B3, B4 and B7) through the difference between the core A1 and the cores B1, B2, B3, B4, B5, B6 and B7, so that the positions of B1, B2, B3, B4, B5, B6 and B7 can be successfully positioned, and the purpose of identifying all the cores is achieved.
Example 4:
as shown in FIG. 4, the core lattice structure with the dissimilarity structure and the asymmetrical fiber core arrangement is a circumferential fiber core lattice symmetrical distribution structure with 8 fiber cores, 1 common outer cladding layer, and the effective area of 8 fiber cores is 56.16-65.33 μm2The 8 fiber cores are uniformly distributed on a circumference at equal intervals along the circumferential direction, the distance between every two adjacent core layers is a, the first fiber core A and the second fiber core B are fiber cores with different structures, three fiber cores B3, B2 and B1 at the middle upper part, the left upper part and the left lower part in the symmetrical fiber core lattice are set as fiber cores with a second waveguide structure, and fiber cores A1, A2, A3, A4 and A5 in the other fiber core lattices are fiber cores with a first waveguide structure, namely the fiber cores with different structures are asymmetrically distributed in the symmetrical fiber core lattice, so that 8 single mode fibers with two different structures are formed together. The positions of A1, B1, B2 and B3 can be located through the difference between the fiber core A1 and the fiber cores B1, B2 and B3, so that the positions of A2, A3, A4 and A5 are continuously located, and the purpose of identifying all the fiber cores is achieved.
Example 5:
as shown in FIG. 5, the asymmetric core lattice structure comprises 11 cores and 1 common outer cladding, wherein the effective area of the 11 cores is 51.62-60.57 μm2And different from each other, the asymmetric fiber core lattice is that one fiber core is removed from the lower left two positions on the basis of a3 × 4 rectangular symmetric fiber core lattice (as shown in fig. 6), and as one fiber core is lost from the lower left two positions, the fiber cores No. 1 and No. 2 are easily identified through the gap positions, so that all 11 fiber cores are identified.
Example 6:
as shown in FIG. 7, the combination of the asymmetric fiber core lattice and the fiber core lattice with the different structures and asymmetrically arranged fiber cores comprises 9 fiber cores and 1 common outer cladding, wherein the effective areas of the 9 fiber cores are 61.40-70.73 μm2And different from each other, wherein 8 fiber cores are symmetrically distributed in a rectangular fiber core lattice in a2 x 4 structure, a fiber core P is additionally arranged at the asymmetric position of the symmetric fiber core lattice, the fiber core P is positioned at the left side of the fiber core A1 at the upper row, the distance a from the fiber core A1 to the fiber core A is 22 mu m and is closer than the distance from the fiber cores to other fiber cores,the minimum value of the effective area of the core other than the core P is 52.63 mu m2Thus a satisfies
The core P is found firstly, and the core A1 is easily identified because the P is closest to A1, so that the positions of other cores B1, B2, B3, B4, B5, B6 and B7 are successfully positioned, and the aim of identifying all the cores is fulfilled. In order to improve the identification performance, the fiber cores A1 in the core lattice are provided with the first type of waveguide structure fiber cores, and the first type of waveguide structure fiber cores and the fiber cores B1, B2, B3, B4, B5, B6 and B7 are provided with the second type of waveguide structure fiber cores to form the fiber core lattice structure with the different structure fiber cores in asymmetric arrangement.
Example 7:
as shown in FIG. 8, the asymmetric core lattice structure is a circular core lattice, and comprises 9 cores and 1 common outer cladding, wherein the effective areas of the 9 cores are 66.58-73.12 μm2Wherein, 7 fiber cores are equally distributed on a circle, 1 fiber core is distributed at the center of the circle-shaped fiber core lattice, the center of the circle-shaped fiber core lattice is coincided with the center of a common outer cladding layer, a new fiber core P is added at the asymmetric position near the fiber cores 1 and 2 above the circle-shaped fiber core lattice, the distances from the fiber core P to the fiber cores 1 and 2 are respectively a 1-23.6 μm, a 2-31.42 μm, and the minimum effective area of the fiber cores except the fiber core P is 55.27um2A1 and a2 satisfy
Firstly, a fiber core P is found, and the distance a1 between the P and the adjacent fiber cores 1 and 2 is not equal to a2, so that the fiber cores 1 and 2 can be positioned, and further other fiber cores 3, 4, 5, 6 and 7 can be identified, and the purpose of identifying all the fiber cores is realized.
Claims (9)
1. A multi-core optical fiber convenient for identification and butt joint comprises a common outer cladding layer and fiber cores arranged in the common outer cladding layer at intervals, wherein the fiber cores are arranged on the radial section of the multi-core optical fiber to form a fiber core lattice, and the multi-core optical fiber is characterized in that the fiber core lattice is an asymmetric fiber core lattice, or is a fiber core lattice with a different structure and asymmetrically arranged, or is a combination of the two structures.
2. The multicore optical fiber of claim 1, wherein the asymmetric core lattice is one of adding or removing at least one core at an asymmetric position of the symmetric core lattice, or shifting at least one core in the symmetric core lattice to an asymmetric position, the asymmetric position comprising an asymmetric position in or outside the core lattice.
3. The multicore optical fiber of claim 1, wherein the asymmetrically arranged core lattice of the heterostructured cores is an asymmetrically arranged heterostructured core in a symmetric core lattice.
4. A multicore optical fiber for easy identification and interfacing as claimed in claim 2 or 3, wherein said symmetrical core lattice comprises a circumferential core lattice, a regular polygonal core lattice or a rectangular core lattice.
5. The multicore optical fiber of claim 4, wherein the cores are equally spaced within a core lattice, the center of the core lattice coinciding with the center of the common overcladding layer.
6. The multicore optical fiber of claim 2 or 3, wherein the core comprises a core and a cladding, and the heterostructured core is of a different core and/or cladding waveguide structure.
7. The multi-core optical fiber for facilitating identification and splicing as claimed in claim 6, wherein said cladding is an inner cladding or an inner cladding and a depressed cladding, the cladding being a common outer cladding.
8. The multicore optical fiber of claim 2 or 3, wherein the cores have an effective area at 1310nm50.01 to 75.01 μm2And are different from each other.
9. The optical fiber as claimed in claim 2 or 3, wherein the minimum effective area of each core at 1310nm is defined as d (μm)2) And the distance a between the fiber core and the adjacent fiber core is additionally arranged at the asymmetric position of the symmetric fiber core lattice to satisfy the following conditions:
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113589422A (en) * | 2021-06-23 | 2021-11-02 | 长飞光纤光缆股份有限公司 | Easily-identified multi-core optical fiber |
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| US20140029889A1 (en) * | 2012-07-26 | 2014-01-30 | j-fiber, GmbH | Sensor Fiber Having a Multicore Optical Waveguide Including Fiber Bragg Gratings |
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| US20150188634A1 (en) * | 2008-02-27 | 2015-07-02 | Furukawa Electric Co., Ltd. | Optical transmission system and multi-core optical fiber |
| WO2018000232A1 (en) * | 2016-06-29 | 2018-01-04 | 华为技术有限公司 | Multi-core optical fibre |
| CN110346864A (en) * | 2019-06-04 | 2019-10-18 | 烽火通信科技股份有限公司 | A kind of multicore less fundamental mode optical fibre and its manufacturing method |
| CN110568548A (en) * | 2019-09-06 | 2019-12-13 | 江苏斯德雷特通光光纤有限公司 | multi-core optical fiber with controllable multi-layer fiber core |
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2020
- 2020-09-18 CN CN202010985340.XA patent/CN111897046A/en active Pending
Patent Citations (9)
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| US4644522A (en) * | 1983-10-21 | 1987-02-17 | At&T Bell Laboratories | Information transmission using dispersive optical channels |
| US20150188634A1 (en) * | 2008-02-27 | 2015-07-02 | Furukawa Electric Co., Ltd. | Optical transmission system and multi-core optical fiber |
| CN101852889A (en) * | 2010-05-17 | 2010-10-06 | 哈尔滨工程大学 | A variable-period array multi-core optical fiber and its preparation method |
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