CN108508530A - Couple four-core fiber - Google Patents
Couple four-core fiber Download PDFInfo
- Publication number
- CN108508530A CN108508530A CN201810223862.9A CN201810223862A CN108508530A CN 108508530 A CN108508530 A CN 108508530A CN 201810223862 A CN201810223862 A CN 201810223862A CN 108508530 A CN108508530 A CN 108508530A
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- Prior art keywords
- core
- coupling
- fiber
- raceway groove
- fibre
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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
- G02B6/028—Optical fibres with cladding with or without a coating with core or cladding having graded refractive index
- G02B6/0281—Graded index region forming part of the central core segment, e.g. alpha profile, triangular, trapezoidal core
-
- 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
- G02B6/03605—Highest refractive index not on central axis
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The present invention provides a kind of coupling four-core fiber, it is related to technical field of photo communication, the coupling four-core fiber includes the identical graded index core with raceway groove auxiliary of four structural parameters, and the cross section of four raceway groove auxiliary fibre cores is tangent two-by-two, the structural parameters include fiber core radius, channel width, fiber core refractive index, raceway groove refractive index and cladding index.Lower difference modes group delay transmission on C+L wave bands is realized on the basis of four cores couple.
Description
Technical field
The present invention relates to technical field of photo communication more particularly to a kind of coupling four-core fibers.
Background technology
With the rapid growth of data traffic business in mobile Internet, existing transmission network receives very big number
According to impact.The big data transmission especially to happen suddenly, needs the bandwidth of bigger and faster transmission rate, this passes next-generation optical fiber
More stringent requirements are proposed for the design of defeated network.In in the past few decades, due to a series of appearance of disruptive technologies, single
The transmission capacity of single mode optical fiber (Single Mode Fiber, SMF) is exponentially increased with the speed of every 4 years an order of magnitude.
In recent years, by using time division multiplexing (Time Division Multiplexing, TDM), wavelength-division multiplex (Wavelength
Division Multiplexing, WDM) and palarization multiplexing (Polarization Division Multiplexing, PDM)
Etc. a variety of multiplexing technologies, the Transmission system of single single mode optical fiber has had reached the capability value of every 100Tbits/s, and the value is
Through the very close Shannon theory limit, this shows that existing optical fiber technology cannot be fully solved and is led by ever-increasing network data
The transmission capacity crisis of cause.In order to overcome the capacity limit of current optical fiber communication system, people are to being based on less fundamental mode optical fibre (Few
Mode Fiber, FMF) and multi-core optical fiber (Multi Core Fiber, MCF) space division multiplexing (Space Division
Multiplexing, SDM) technology conducts in-depth research.
In current existing achievement in research, some coupling multicore optical fiber can only be realized on the basis of three cores on C-band compared with
Low difference modes group delay, although and other coupling multicore optical fiber can transmit more channels using more fibre core,
It is that can only be implemented around lower difference modes group delay in specific wavelength.According to coupled-mode theory, homogeneity couples N core fibres
Usually support N number of scalar spatial model.When fibre core number is more, the pattern count transmitted in coupling multicore light is also more, between pattern
Difference modes group delay it is more difficult to control.
Invention content
The present invention provides a kind of coupling four-core fiber, and lower differential mode on C+L wave bands is realized on the basis of four cores
Formula group delay is transmitted.
On the one hand, an embodiment of the present invention provides a kind of coupling four-core fibers, including four structural parameters are identical has
The graded index core of raceway groove auxiliary, and the cross section of four raceway groove auxiliary fibre cores is tangent two-by-two, the structural parameters include
Fiber core radius, channel width, fiber core refractive index, raceway groove refractive index and cladding index.
Further, the coupling four-core fiber is that W type graded indexs couple four-core fiber.
Further, fiber core radius is 6.5 μm, and channel width is 3 μm, cladding index 1.45, fibre core and covering
Relative fefractive index difference is 0.4%, and the relative fefractive index difference of raceway groove and covering is -0.7%, deformation 3.7.
Coupling four-core fiber provided by the invention, using the identical gradient index with raceway groove auxiliary of four structural parameters
Rate fibre core, and the cross section of four raceway groove auxiliary fibre cores is tangent two-by-two, raceway groove, which is utilized, can fetter light field and gradient index
Rate fibre core can reduce the characteristic of the difference modes group delay of less fundamental mode optical fibre, realized on the basis of four cores on C+L wave bands compared with
Low difference modes group delay transmission..
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the structural schematic diagram in coupling four-core fiber cross section provided by the invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
Less fundamental mode optical fibre transmits more patterns on single fibre core and pattern has larger effective area (Effective
Area, Aeff), and larger effective area can reduce it is non-linear caused by modal loss.But less fundamental mode optical fibre is passed in long range
Defeated application is above greatly limited because in optical fiber pattern quantity increase, when difference modes group between pattern
Prolong (Differential Mode Group Delay, DMGD) it is more difficult to control, however the size of difference modes group delay again certainly
The Digital Signal Processing based on multiple-input and multiple-output (Multiple Input Multiplex Output, MIMO) is determined
The computation complexity of (Digital Singal Processing, DSP) technology.And when transmission mode increases, on the one hand,
Less fundamental mode optical fibre Transmission system needs multiplexing and demultiplexer, and the differential loss between different mode is larger；On the other hand, between pattern
Effective refractive index (Effective Index, neff) difference can reduce.When the effective refractive index difference between pattern is smaller, few mould
Optical fiber will appear Mode Coupling, this can cause the difference modes group delay between pattern to increase.
Multi-core optical fiber is divided into no coupling multicore optical fiber (or weak coupling multi-core optical fiber) and coupling multicore optical fiber, and (or close coupling is more
Core fibre).In no coupling multicore optical fiber, between pattern lower crosstalk enable core signal individual transmission, do not need base
In the Digital Signal Processing and multiplexing demultiplexing device of multiple-input and multiple-output.But it in order to reduce the interference between core mode, needs
Larger fibre core spacing and more complicated supplementary structure, such as raceway groove, airport and low-refraction stick etc..So without coupling multicore
The effective area of pattern is smaller in optical fiber, and fibre core density is relatively low.And coupling multicore optical fiber is introduced by the distance between shortening fibre core
Core mode couples.These coupled mode are considered as being overlapped mutually to be formed between the mode electric field of single fibre core, therefore couple
Pattern is also referred to as super model (Supermode).The effective area of pattern is more compared with no coupling multicore optical fiber, in coupling multicore optical fiber
Big and space availability ratio higher.Compared with less fundamental mode optical fibre, pattern dependent loss smaller in coupling multicore optical fiber, the pattern between super model
It is lower to couple almost nil and difference modes group delay.In short, coupling multicore optical fiber combines less fundamental mode optical fibre and without coupling multicore
The advantage of optical fiber has higher design freedom and better transmission characteristic.Therefore, have to the research of coupling multicore optical fiber
Profound significance.
In current existing achievement in research, some coupling multicore optical fiber can only be realized on the basis of three cores on C-band compared with
Low difference modes group delay, although and other coupling multicore optical fiber can transmit more channels using more fibre core,
It is that can only be implemented around lower difference modes group delay in specific wavelength.According to coupled-mode theory, homogeneity couples N core fibres
Usually support N number of scalar spatial model.When fibre core number is more, the pattern count transmitted in coupling multicore light is also more, between pattern
Difference modes group delay it is more difficult to control.
In embodiments of the present invention, the transmission of low delay on C+L wave bands is realized on the basis of four cores.Specifically, such as
Shown in Fig. 1, the embodiment of the present invention provides a kind of coupling four-core fiber, including the identical graded index fiber of four structural parameters
10, every optical fiber includes fibre core 11, covering 12 and raceway groove 13.Specifically, the coupling four-core fiber, including four structural parameters phases
The same graded index core 11 assisted with raceway groove 13, and four raceway grooves 13 assist the cross section of fibre cores tangent two-by-two, institute
It includes fiber core radius, channel width, fiber core refractive index, raceway groove refractive index and cladding index to state structural parameters.
In the present embodiment, fibre core, covering and raceway groove are described in detail, about fibre core, covering and raceway groove
These, the only statement of different zones can call refractive index higher region fibre core, and fibre core lower region is covering, most
Low area is raceway groove, this is because refraction and the reflection characteristic of light, when light is when high refractive index is transmitted, the low-refraction of surrounding can
To fetter light field so that the energy of light all concentrates on core segment transmission.In addition, the addition by raceway groove 13 appropriate can limit
The coupling of fibre core part processed, and reduce the stiffness of coupling between fibre core, it is notable that it is still between guarantee fibre core still be strong coupling
It closes, i.e., the coefficient of coup between fibre core has to be more than 0.1m-1, under the premise of these, suitable raceway groove and core parameters are selected, are made
It obtains difference modes group delay of the base time between super model and high order super model and is both less than 100ps/km as far as possible, how defeated such receiving terminal be based on
The Digital Signal Processing for entering multi output will be fairly simple, and calculation amount will be small.
And in the present embodiment for tangent two-by-two between the cross section of four optical fiber 10 so that multi-core optical fiber is in practical drawing
It is more easily implemented in system.
Optionally, in one embodiment, the coupling four-core fiber is that W type graded indexs couple four-core fiber.
Further, fiber core radius is 6-7 μm, and the relative fefractive index difference of fibre core and covering is more than or equal to 0.4%.
Further, channel width is 3 μm, cladding index 1.45, and the relative fefractive index difference of raceway groove and covering
For -0.7%, deformation 3.7.
Preferably, fiber core radius is 6.5 μm, and channel width is 3 μm, cladding index 1.45, the phase of fibre core and covering
Refractive index difference is 0.4%, and the relative fefractive index difference of raceway groove and covering is -0.7%, deformation 3.7.
When fiber core radius is 6.5 μm, channel width is 3 μm, cladding index 1.45, the relative of fibre core and covering
Rate difference is 0.4%, when the relative fefractive index difference (channel depth) of raceway groove and covering is -0.7% and deformation is 3.7 so that
The optical fiber on C+L wave bands primary super model and secondary super model (or super model three times, secondary super model are degenerate mode with super model three times) with
And maximum difference modes group delay is respectively smaller than 60ps/km and 105ps/km between a super model and four super models, realizes biography
Also there can be lower difference modes group delay while defeated more multi-mode.
It should be noted that being not to say that under this group of parameter above, it could realize and be transmitted on C+L wave bands, but at this
Under the parameter of sample, enough small, the maximum energy realizations of difference modes group delay of the base time between super model and high order super model on C+L wave bands
105ps/km is left back in 100ps/km；About the value range of above structure parameter, theoretically the wider raceway groove the deeper, for light field
Constraint ability it is stronger, it is contemplated that being the actual fabrication technique of close coupling and raceway groove, value channel width between fibre core
It it is 3 μm, the relative fefractive index difference (channel depth) of raceway groove and covering is -0.7%.
Coupling four-core fiber provided by the invention, using the identical graded index fiber of 4 structural parameters, and 4 light
Tangent two-by-two between fine cross section, identical raceway groove assists graded index core and adjacent fibre core is tangent, is utilized
Raceway groove can fetter light field and graded index core can reduce less fundamental mode optical fibre difference modes group delay characteristic, four
Lower difference modes group delay transmission on C+L wave bands is realized on the basis of core.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (5)
1. a kind of coupling four-core fiber, which is characterized in that including the identical gradual change folding with raceway groove auxiliary of four structural parameters
Rate fibre core is penetrated, and the cross section of four raceway groove auxiliary fibre cores is tangent two-by-two, the structural parameters include fiber core radius, ditch road width
Degree, fiber core refractive index, raceway groove refractive index and cladding index.
2. coupling four-core fiber according to claim 1, which is characterized in that the coupling four-core fiber is rolled over for W type gradual changes
Penetrate rate coupling four-core fiber.
3. coupling four-core fiber according to claim 1, which is characterized in that the fiber core radius is 6-7 μm, the fibre core
It is more than or equal to 0.4% with the relative fefractive index difference of the covering.
4. coupling four-core fiber according to claim 3, which is characterized in that the fiber core radius is 6.5 μm, the fibre core
Relative fefractive index difference with covering is 0.4%.
5. coupling four-core fiber according to claim 3 or 4, which is characterized in that channel width is 3 μm, cladding index
It is 1.45, and the relative fefractive index difference of raceway groove and covering is -0.7%, deformation 3.7.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810223862.9A CN108508530A (en) | 2018-03-19 | 2018-03-19 | Couple four-core fiber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810223862.9A CN108508530A (en) | 2018-03-19 | 2018-03-19 | Couple four-core fiber |
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| Publication Number | Publication Date |
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| CN108508530A true CN108508530A (en) | 2018-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810223862.9A Pending CN108508530A (en) | 2018-03-19 | 2018-03-19 | Couple four-core fiber |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188604A (en) * | 2018-10-23 | 2019-01-11 | 聊城大学 | A kind of six core close coupling of low-loss low crosstalk, two mode fiber |
| CN112969941A (en) * | 2018-11-21 | 2021-06-15 | 日本电信电话株式会社 | Multi-core optical fiber, multi-core optical fiber design method, and optical transmission method |
| CN115327697A (en) * | 2022-08-17 | 2022-11-11 | 长飞光纤光缆股份有限公司 | Random coupling multi-core optical fiber, manufacturing method thereof and multi-core optical cable |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015178444A (en) * | 2014-02-28 | 2015-10-08 | 株式会社フジクラ | Method of manufacturing base material for multicore fiber, and method of manufacturing multicore fiber using the same |
| CN205581341U (en) * | 2016-05-10 | 2016-09-14 | 罗碧贤 | Multi -channel optical fiber |
-
2018
- 2018-03-19 CN CN201810223862.9A patent/CN108508530A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015178444A (en) * | 2014-02-28 | 2015-10-08 | 株式会社フジクラ | Method of manufacturing base material for multicore fiber, and method of manufacturing multicore fiber using the same |
| CN205581341U (en) * | 2016-05-10 | 2016-09-14 | 罗碧贤 | Multi -channel optical fiber |
Non-Patent Citations (3)
| Title |
|---|
| 杨芳: "通信用多芯光纤的光学特性研究", 《中国优秀硕士学位论文全文数据库 信息科技辑》 * |
| 杨芳等: "低串扰大模场面积多芯光纤的设计与优化", 《光学学报》 * |
| 涂佳静: "少模多芯光纤的纤芯排布方法", 《光子学报》 * |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109188604A (en) * | 2018-10-23 | 2019-01-11 | 聊城大学 | A kind of six core close coupling of low-loss low crosstalk, two mode fiber |
| CN112969941A (en) * | 2018-11-21 | 2021-06-15 | 日本电信电话株式会社 | Multi-core optical fiber, multi-core optical fiber design method, and optical transmission method |
| CN112969941B (en) * | 2018-11-21 | 2023-08-25 | 日本电信电话株式会社 | Multi-core optical fiber and optical transmission method |
| CN115327697A (en) * | 2022-08-17 | 2022-11-11 | 长飞光纤光缆股份有限公司 | Random coupling multi-core optical fiber, manufacturing method thereof and multi-core optical cable |
| CN115327697B (en) * | 2022-08-17 | 2024-04-26 | 长飞光纤光缆股份有限公司 | Random coupling multi-core optical fiber, manufacturing method thereof and multi-core optical cable |
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Application publication date: 20180907 |
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