CN110568548A - multi-core optical fiber with controllable multi-layer fiber core - Google Patents
multi-core optical fiber with controllable multi-layer fiber core Download PDFInfo
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- CN110568548A CN110568548A CN201910843246.8A CN201910843246A CN110568548A CN 110568548 A CN110568548 A CN 110568548A CN 201910843246 A CN201910843246 A CN 201910843246A CN 110568548 A CN110568548 A CN 110568548A
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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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- 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
- G02B6/03616—Optical fibres characterised both by the number of different refractive index layers around the central core segment, i.e. around the innermost high index core layer, and their relative refractive index difference
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Abstract
The invention provides a multi-core optical fiber with controllable multilayer fiber cores, which is characterized in that: including fibre core and cladding, the fibre core is inlayed in the cladding, and all is equipped with multilayer structure in every fibre core, and the refractive index difference of relative cladding is delta n, and wherein n is the positive integer to and the different thickness of sandwich layer is am, and wherein m is the positive integer, multicore optic fibre includes t layer fibre core, and wherein t is the positive integer, be equipped with optic fibre structure of bundling on the cladding tangent plane, and be equipped with a plurality of holes with fibre core diameter looks adaptation on the optic fibre structure of bundling, the diameter of optic fibre structure of bundling is the same with the diameter of cladding. In the technical field of optical fiber communication, the problems of high difficulty in manufacturing multi-core optical fibers and high crosstalk among cores exist, and the multi-core optical fiber with controllable multi-layer fiber cores is provided.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a multi-core optical fiber with controllable multilayer fiber cores.
Background
In recent years, with the rapid development of services such as ultra-clear video, cloud computing and 5G, the demand for network bandwidth is increasing. With the evolution and development of the high-speed optical transmission technology of over 100Gbit/s, such as 400Gbit/s and 1Tbit/s, the single-fiber transmission capacity can be further improved by improving the baud rate of the electric signals and introducing high-order modulation formats, such as quadrature amplitude modulation and modes of expanding the C + L band transmission window of the optical fiber. However, the transmission capacity of the single-core optical fiber is rapidly approaching to the physical limit, and in the coming years, the contradiction between the lack of the increase of the transmission capacity of the optical network and the bandwidth hunger of the internet service will lead to bandwidth crisis, which has become an important problem to be solved in the optical communication industry. The multi-core fiber (MCF) based on space division multiplexing can realize the capacity expansion of the optical fiber without increasing the laying space and cost of the optical cable, and can well overcome the limitation of the transmission capacity of the single-mode optical fiber. Meanwhile, the transmission capacity of the multi-core optical fiber can be further improved by improving the modulation format and increasing the effective area of the optical fiber, which will have great influence on future optical transmission systems.
A multicore fiber is an optical fiber in which a plurality of cores are accommodated in the same cladding, and optical signals propagate through the plurality of cores. Recent research results show that multi-core optical fibers have played an important role in the fields of optical fiber communication and optical networks. In the transmission field, a 22-core multi-core optical fiber with the length of 31km based on a double-annular fiber core structure realizes the system transmission capacity of 2.15 Pbit/s; the 12-core multi-core optical fiber with the length of 46km based on the single-ring fiber core structure realizes 14350km transmission of the farthest 26 circles of 105Tbit/s capacity optical signals. In addition, the multi-core optical fiber can be used for developing important optoelectronic devices such as high-performance lasers, amplifiers and couplers required by a large-capacity communication network. Therefore, the research and fabrication of multi-core optical fiber will play a significant role in the development of future high-capacity communication systems.
The inter-core crosstalk, which is the cross interference of optical signals between adjacent channels in the multi-core optical fiber, is the most important factor that limits the transmission capacity of the multi-core optical fiber. To suppress cross-talk between cores, researchers have devised a number of specific fiber configurations, including: trench-assisted, air hole-assisted, etc. The groove-assisted multi-core fiber adopts a low-refractive-index ring surrounding each fiber core, so that energy diffusion is limited. The air hole auxiliary structure utilizes the air hole mode to realize stronger light field limiting capability than the groove structure. However, the addition of the new structure greatly increases the difficulty of manufacturing the multi-core fiber, the design of accommodating a plurality of fiber cores in the limited cladding already increases the manufacturing cost, and if other structures are continuously embedded in the multi-core fiber, the design transmission performance of the multi-core fiber will be affected. Meanwhile, due to the embedding of the groove or air hole structure, the fusion loss between the multi-core fiber and the common single-mode fiber can be increased, and the complexity of a demultiplexing program of a receiving end can also be increased.
Therefore, it is urgently needed to design a multi-core optical fiber with low crosstalk between cores without other auxiliary structures and with a large number of spatial channels to meet the transmission capacity requirement of the space division multiplexing system for the multi-core optical fiber.
Disclosure of Invention
For overcoming the problems of large difficulty in manufacturing multi-core optical fibers and large crosstalk between cores in the prior art, the multi-core optical fiber with controllable multi-layer fiber cores is provided, and is characterized in that: including fibre core and cladding, the fibre core is inlayed in the cladding, and all is equipped with multilayer structure in every fibre core, and the refractive index difference of relative cladding is delta n, and wherein n is the positive integer to and the different thickness of sandwich layer is am, and wherein m is the positive integer, multicore optic fibre includes t layer fibre core, and wherein t is the positive integer, be equipped with optic fibre structure of bundling on the cladding tangent plane, and be equipped with a plurality of holes with fibre core diameter looks adaptation on the optic fibre structure of bundling, the diameter of optic fibre structure of bundling is the same with the diameter of cladding.
Preferably, the number of the cores is at least one, and the number of the cores is at least two.
By adopting the technical scheme, at least one core rod is arranged in the multi-core optical fiber, the workload can be reduced, the core rods are fixedly installed through the buncher, and for the layer number of the core rods, the structure of at least two layers is adopted, and the cross talk among the cores of the multi-core optical fiber with controllable multi-layer fiber cores is favorably reduced through the difference value between the refractive indexes of each layer relative to the cladding.
Preferably, the respective cores are arranged in an arbitrary central symmetrical pattern, which is one of a dense symmetrical pattern, a single-ring pattern, a double-ring pattern, and a four-sided pattern.
By adopting the technical scheme, the fiber cores are arranged in the cladding at the centrosymmetric positions in any form, so that the normal implementation of the multi-core rod in the subsequent production process is ensured, the stability of the core rod in the internal structure of the cladding is ensured, meanwhile, the structure also provides a foundation for the subsequent processing process of the multi-core rod, and the structural stability of the internal core rod is ensured.
Preferably, the cores are not in contact with each other, the cores are uniformly distributed in the cladding, and the joints between the cores in the cores are in a vacuum structure.
By adopting the technical scheme, the fiber cores are not contacted, the fiber cores are uniformly distributed in the cladding, and the design of a vacuum structure is adopted between the core layers in the fiber cores, so that the vacuum connection between the core layers in the fiber cores is ensured, and the fiber cores have good connection tightness.
Preferably, the outer diameters of the cores are the same, and the diameters of the inner core rods of the two adjacent cores are different when the number of layers between the two adjacent cores is different.
By adopting the technical scheme, each fiber core has the same external dimension, and the distribution in the cladding is uniform, so that the same external core layer can be prepared in the manufacturing process, the batch production is convenient, and the production efficiency is improved.
Preferably, the difference in refractive index of the different opposing claddings is Δ n, wherein n is a positive integer, and wherein Δ n increases with increasing n.
By adopting the technical scheme, the refractive index difference is increased along with the increase of the number of the core layers, and the refractive index difference relative to the cladding is larger along with the increase of the number of the core layers, so that the anti-interference capability between the cores is better.
Preferably, the cores of the layers have different thicknesses am which are smaller than the thickness of the cladding, and the thickness of the corresponding layer of each core is consistent.
By adopting the technical scheme, the thickness am of each fiber layer in the fiber core is smaller than that of the cladding, the cladding can stably wrap the inner fiber core, and the corresponding layer thicknesses between the core layers of the corresponding number of each fiber core are equal.
Preferably, the refractive index of the cladding is in the range of 1 to 5.
By adopting the technical scheme, the refractive index of the cladding has a large range, and can generate a refractive index difference value with a multilayer core layer in the fiber core, so that a stably-changed refractive index difference value can be provided in the continuously-increased process of the core layer, and the better anti-interference capability of the core rod is ensured.
Preferably, the cladding diameter is in the range of 1nm to 500 um.
By adopting the technical scheme, the diameter of the cladding is changed in a larger range, and the diameter of the cladding is smaller, so that the number of the fiber cores arranged in the cladding can be adapted.
Preferably, gaps are arranged at the joints of the layers of the fiber core, and the gaps are all vacuum.
By adopting the technical scheme, the layers of the fiber core are tightly connected in an integral connection mode, the layers are tightly connected, and the space between the layers is pumped into a vacuum part to ensure gas connection.
The invention only adopts the fiber core structure with different layers to realize better inter-core crosstalk inhibition capability than other embedded auxiliary structures. In addition, the optical fiber has a large number of transmission channels and a relatively simple core structure design. The arrangement mode of the fiber cores can be adjusted according to actual needs, and the difficulty of position alignment in the process of manufacturing the multi-core optical fiber is avoided. Meanwhile, because no special cladding structure exists, the optical fiber and the common single-mode optical fiber have smaller fusion loss and are convenient to draw and form fiber, can be widely applied to the fields of space division multiplexing optical fiber transmission systems and the like, and has wide application prospect.
Drawings
FIG. 1 is a schematic cross-sectional view of a multi-core optical fiber with a controllable multi-layer core;
FIG. 2 is a schematic diagram of any core of a multi-core optical fiber with a controllable multi-layer core.
Reference numerals: the labels in FIG. 1 are as follows: 100. a 1 st core layer; 200. a 2 nd core layer; 300. a 3 rd core layer; 400. a 4 th core layer; 01. and (7) cladding.
The labels in fig. 2 are as follows: 100. a 1 st core layer; 200. a 2 nd core layer; 300. a 3 rd core layer; 110. the thickness of the 1 st fiber core layer; 210. the thickness of the 2 nd layer fiber core; 310. the 3 rd layer core thickness.
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 and 2: a multi-core optical fiber having a controllable multi-layer core, comprising: the multi-core optical fiber comprises a fiber core and a cladding 01, wherein the fiber core is embedded in the cladding 01, each fiber core is internally provided with a multi-layer structure, the refractive index difference relative to the cladding 01 is delta n, n is 1, 2, 3 and 4, the different thicknesses of the core layers are am, m is 1, 2 and 3, the thicknesses comprise the thickness of a 1 st fiber core 100, the thickness of a 2 nd fiber core 210 and the thickness of a 3 rd fiber core 300, the multi-core optical fiber comprises t fiber cores, wherein t is 4, and the multi-core optical fiber comprises the 1 st fiber core 100, the 2 nd fiber core 200, the 3 rd fiber core 300 and the 4 th fiber core 400; the section of the cladding 01 is provided with an optical fiber bundling structure, the optical fiber bundling structure is provided with a plurality of holes matched with the diameter of the fiber core, and the diameter of the optical fiber bundling structure is the same as that of the cladding 01.
As shown in fig. 1 and 2: the number of the cores is at least one, and the number of the cores is at least two. The core rod is fixedly installed through the buncher, and the number of layers of the core rod is at least two, and the difference between the refractive indexes of each layer of the core rod relative to the cladding 01 is favorable for reducing the crosstalk between the cores of the multi-core optical fiber with the controllable multi-layer fiber core.
As shown in fig. 1 and 2: the fiber cores are arranged in a central symmetrical format in any form, and the arrangement form is one of dense symmetry type, single ring type, double ring type and four-edge type. The fiber cores are arranged in the cladding 01 at centrosymmetric positions in any form, so that the normal implementation of the multi-core rod in the subsequent production process is ensured, the stability of the core rod in the internal structure of the cladding 01 is ensured, and meanwhile, the structure provides a foundation for the subsequent processing process of the multi-core rod and ensures the structural stability of the internal core rod.
As shown in fig. 1 and 2: the fiber cores are not in contact with each other, are uniformly distributed in the cladding 01, and are in a vacuum structure at the connection position between the core layers in the fiber cores. The fiber cores are not in contact with each other, the fiber cores are uniformly distributed in the cladding 01, and the design of a vacuum structure is adopted among the core layers in the fiber cores, so that the vacuum connection among the core layers in the fiber cores is ensured, and the fiber cores have good connection tightness.
As shown in fig. 1 and 2: the outer diameters of the fiber cores are the same, and the number of layers between two adjacent fiber cores is different, so that the diameters of the inner-layer core rods of the two adjacent fiber cores are different. Each fiber core has the same external dimension, and the distribution in the cladding 01 is uniform, so that the same external core layer can be prepared in the manufacturing process, the batch production is convenient, and the production efficiency is improved.
Example 2
As shown in fig. 1 and 2: a multi-core optical fiber having a controllable multi-layer core, comprising: the multi-core optical fiber comprises a fiber core and a cladding 01, wherein the fiber core is embedded in the cladding 01, each fiber core is internally provided with a multi-layer structure, the refractive index difference relative to the cladding 01 is delta n, n is 1, 2, 3 and 4, the different thicknesses of the core layers are am, m is 1, 2 and 3, the thicknesses comprise the thickness of a 1 st fiber core 100, the thickness of a 2 nd fiber core 210 and the thickness of a 3 rd fiber core 300, the multi-core optical fiber comprises t fiber cores, wherein t is 4, and the multi-core optical fiber comprises the 1 st fiber core 100, the 2 nd fiber core 200, the 3 rd fiber core 300 and the 4 th fiber core 400; the section of the cladding 01 is provided with an optical fiber bundling structure, the optical fiber bundling structure is provided with a plurality of holes matched with the diameter of the fiber core, and the diameter of the optical fiber bundling structure is the same as that of the cladding 01.
As shown in fig. 1 and 2: the difference in refractive index of the different opposing claddings 01 is Δ n, where n is a positive integer, and where Δ n increases with increasing n. The refractive index difference increases along with the increase of the number of the core layers, and the refractive index difference of the core layers relative to the cladding layer 01 is larger along with the increase of the number of the core layers, so that the anti-interference capability among the cores is better.
As shown in fig. 1 and 2: the fiber cores of all layers have different thicknesses am which are smaller than the thickness of the cladding 01, and the thickness of the corresponding layer number of each fiber core is consistent. The thickness am of each fiber layer in the fiber core is smaller than that of the cladding 01, the cladding 01 can stably wrap the fiber core inside, and the corresponding layer thicknesses among the core layers corresponding to the number of each fiber core are equal.
As shown in fig. 1 and 2: cladding 01 has a refractive index in the range of 1-5. The refractive index of the cladding 01 has a large range, and can generate a refractive index difference value with a multilayer core layer in the fiber core, so that a stably-changed refractive index difference value can be provided in the process that the core layer is continuously increased, and the better anti-interference capability of the core rod is ensured.
As shown in fig. 1 and 2: the cladding 01 has a diameter in the range of 1nm to 500 um. The diameter of the cladding 01 varies over a large range, while the diameter of the cladding 01 is of a smaller size, able to accommodate the number of cores provided inside.
As shown in fig. 1 and 2: gaps are arranged at the joints of the layers of the fiber core, and the gaps are all vacuum. The layers of the fiber core are tightly connected in an integral connection mode, the layers are tightly connected, and the layers are pumped into a vacuum part at the position where a gap is formed between the layers, so that gas connection is ensured.
While the foregoing description shows and describes the preferred embodiments of the present invention, it is to be understood that the invention is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as described herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A multi-core optical fiber having a controllable multi-layer core, comprising: including fibre core and cladding (01), the fibre core is inlayed in cladding (01), and all is equipped with multilayer structure in every fibre core, and the refractive index difference of relative cladding (01) is delta n, and wherein n is positive integer to and the different thickness of sandwich layer is am, and wherein m is positive integer, multicore optic fibre includes t layer fibre core, and wherein t is positive integer, be equipped with optic fibre structure of bundling on cladding (01) the tangent plane, and be equipped with a plurality of holes with fibre core diameter looks adaptation on the optic fibre structure of bundling, the diameter of optic fibre structure of bundling is the same with the diameter of cladding (01).
2. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: the number of the fiber cores is at least one, and the number of the fiber cores is at least two.
3. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: the fiber cores are arranged in a central symmetrical format in any form, and the arrangement form is one of dense symmetry type, single ring type, double ring type and four-edge type.
4. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: the fiber cores are not in contact with each other, are uniformly distributed in the cladding (01), and are in a vacuum structure at the connection position between the core layers in the fiber cores.
5. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: the outer diameters of the fiber cores are the same, and the number of layers between two adjacent fiber cores is different, so that the diameters of the inner core rods of the two adjacent fiber cores are different.
6. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: the different opposing claddings (01) have refractive index differences Δ n, wherein n is a positive integer, and wherein Δ n increases with increasing n.
7. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: the fiber cores of all layers have different thicknesses am which are smaller than the thickness of the cladding (01), and the thickness of the corresponding layer number of each fiber core is consistent.
8. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: the refractive index of the cladding (01) ranges from 1 to 5.
9. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: the cladding (01) has a diameter in the range of 1nm to 500 um.
10. A multi-core optical fiber with a controllable multi-layer core as claimed in claim 1, wherein: gaps are arranged at the joints of the layers of the fiber core, and the gaps are all vacuum.
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| CN111897046A (en) * | 2020-09-18 | 2020-11-06 | 长飞光纤光缆股份有限公司 | Multi-core optical fiber convenient to identify and butt joint |
| CN112198586A (en) * | 2020-09-25 | 2021-01-08 | 北京邮电大学 | Multi-core optical fiber |
| CN114384653A (en) * | 2022-01-12 | 2022-04-22 | 中天宽带技术有限公司 | Silicon optical module based on heterogeneous multi-core optical fiber |
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