CN103399374A - Multi-core optical fiber - Google Patents
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- CN103399374A CN103399374A CN2013103332644A CN201310333264A CN103399374A CN 103399374 A CN103399374 A CN 103399374A CN 2013103332644 A CN2013103332644 A CN 2013103332644A CN 201310333264 A CN201310333264 A CN 201310333264A CN 103399374 A CN103399374 A CN 103399374A
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Abstract
The invention relates to a multi-core optical fiber for communication. The multi-core optical fiber comprises 7 fiber core regions and a main wrapping layer, and is characterized in that the 7 fiber core regions consists of a center fiber core region and 6 outer fiber core regions which are uniformly distributed at the periphery of the center fiber core region; the core wrapping layer structures of the fiber core regions are the same; a fiber core distance between any two adjacent fiber core regions is the same; each fiber core region comprises a fiber core and an inner wrapping layer and a sunken wrapping layer which wrap a core layer; the residual part is the main outer wrapping layer. The fiber core regions of the multi-core optical fiber are reasonably arranged, so that the multi-core optical fiber is compact in structure and is particularly suitable for a dense wiring or long-distance optical fiber communication environment such as a data center; furthermore, the multi-core optical fiber is high in bending resistance and has extremely small influence on crosstalk between any two cores; under a bending condition, the crosstalk performance can completely meet an error rate requirement of high-speed transmission, and high practicability is achieved; the cutoff wavelength, the chromatic dispersion, the mode field, the PMD (polarization mode dispersion) and the like of the optical fiber can be compatible with those of an optical fiber G.652, thus meeting a requirement on multi-core optical fiber communication.
Description
Technical field
The present invention relates to a kind of multi-core fiber, belong to technical field of optical fiber communication.
Background technology
The capacity of optical fiber communication, with the speed development near enlarging 10 times in every 4 years, has surpassed semi-conductive Moore's Law widely.But the capacity of optical fiber communication is subjected to the impact of the factors such as nonlinear fiber, estimates that generally maximum is 100Tb/s.And the transmission system of single wavelength 1Tb/s has been developed in recent years, and the wavelength-division multiplex system of total volume tens Tb/s has also been realized in simple optical fiber.But in the face of the arrival of large data age, in the face of the transmission requirement of the high amount of traffics such as video and picture, existing network still can't solve the problem of blocking up of network.
Therefore, the transmission system of scientist after considering 5 years requires to have surpassed 100T, and the transmission dilatation of communications industry when the time comes will face technical bottleneck.Be directed to this, international academic community proposes to adopt the mode of space division multiplexing can solve following technical barrier in recent years.Space division multiplexing has dual mode, and the one, mode multiplexing, namely adopt less fundamental mode optical fibre, utilizes the pattern of an Optical Fiber Transmission more than 2 to realize multiplexing, increased power system capacity.The 2nd, multicore is multiplexing, namely adopts the simple optical fiber with a plurality of single mode fuses, realizes multiplexed new transmission technology.Multi-core fiber can be divided into 4 cores according to the fuse quantity in simple optical fiber, 7 cores, 10 cores, 12 cores and 19 core fibres etc.N in these a multi-core fibers fuse correspondingly can enlarge N doubly with the total transmission capacity of system.
In the OFC meeting of 2011, U.S. OFS company has reported the signal transmission that has realized 56Tb/s in 7 core fibres.Same year, Japanese NICT associating SUMITOMO CHEMICAL has been realized the signal transmission of 109Tb/s in 7 core fibres, this is to realize that first simple optical fiber surpasses the transmission experiment of 100Tb/s.In international conference in 2012, Japanese NICT reported first realized surpassing the transmission of 305Tb/s on 19 core fibres.In ECOC meeting in the same year, Japan Report realized the signal transmission experiment more than 1Pb/s in 12 core multi-core fibers, for the future communications network capacity extension provides tachnical storage.In OFC meeting in 2013, there is first report 7 core fibres to be used for the construction of data center, as the height of high-speed computer, highdensity parallel interconnection.Existing these multi-core fibers have all produced application in fields such as communication line and high-speed communication local interconnections.The multi-core fiber of design also has various structures, but these optical fiber structures are not studied and are related to use scenes and the performance of multi-core fiber when bending, and in communication, with being connected, apply, bending is a modal application scenarios, bending causes crosstalks and the use of decay meeting limit fibre.Especially high density connection and particular fiber are transmitted the multi-core fiber of applications, and the optical fiber that uses during for example Fiber to the home (FTTH) is very responsive to the fiber crosswalk index under case of bending.In case under bending condition, fiber crosswalk increases the increase that will cause transmission error rates, will cause communication failure when serious.
Summary of the invention
Technical matters to be solved by this invention is the deficiency that exists for above-mentioned prior art and provides that a kind of structure arranges rationally, the excellent and practical multi-core fiber of bending resistance.
The present invention addresses the above problem the technical scheme that adopts to be: include 7 core regions and 1 total surrounding layer, it is characterized in that described 7 core regions consist of 1 central core district and 6 outer core regions that are distributed on central core district periphery, the core cladding structure of each core region is identical, fibre core spacing between any two adjacent core regions is identical, described core region includes fibre core and holds the inner cladding of sandwich layer, sagging covering, and remainder is total surrounding layer.
Press such scheme, described fiber core radius a is 4.25 ~ 5.25 μ m, sandwich layer refractive index contrast △
1Be 0.16% ~ 0.33%.
Press such scheme, described inner cladding radius b is 9 ~ 14 μ m, inner cladding refractive index contrast △
2For-0.05% ~+0.05%.
Press such scheme, described sagging cladding radius c is 16.5 ~ 22.5 μ m, and covering refractive index contrast △ sink
3For-0.2% ~-0.4%.
Press such scheme, the fibre core spacing P between described any two adjacent core regions is 33 ~ 45 μ m.
Press such scheme, described sagging covering is outside equipped with surrounding layer, and described surrounding layer radius d is 17.5 ~ 23.5 μ m, surrounding layer refractive index contrast △
4For-0.05% ~+0.05%.
Press such scheme, the fibre core spacing P between described any two adjacent core regions is 35 ~ 47 μ m.
Press such scheme, described total surrounding layer is the pure silicon dioxide glassy layer, and the external diameter of total surrounding layer is also that the external diameter 2r of optical fiber is 125 ± 1.5 μ m.
Press such scheme, the mode field diameter of described optical fiber (MFD) is 9.5 ~ 11 μ m near 1550nm, and fiber cut off wavelength is less than or equal to 1400nm, and zero-dispersion wavelength is in 1260 ~ 1350nm scope.
Press such scheme, described optical fiber at 1550nm wavelength place for around 7.5 millimeters bending radius around 1 the circle any one core region crooked added losses be less than or equal to 0.23dB.
Press such scheme, when fibre core spacing P equals 35 microns, signal power at 1550nm wavelength place after 100 kilometers of any two fibre cores transmission additional crosstalking be less than or equal to-69.7dB; Signal power at 1625nm wavelength place after 100 kilometers of any two fuses transmission additional crosstalking be less than or equal to-63.1dB.
Press such scheme, when fibre core spacing P equals 42 microns, signal power at 1550nm wavelength place after 100 kilometers of any two fibre cores transmission additional crosstalking be less than or equal to-86.3dB; Signal power at 1625nm wavelength place after 100 kilometers of any two fuses transmission additional crosstalking be less than or equal to-78.5dB.
The technical term of using in the present invention is defined as follows:
Crosstalk: refer to that the signal coupling that transmits in any one fuse in the Energy Coupling between any two fuses, a plurality of fuse in optical fiber is to the noise that forms in the another one fuse.Its unit is dB, and expression has the energy of how much number percent to go to the another one fuse from a fuse.-10dB represents 1/10;-20dB represents 1/100;-30dB represents 1/1000; The like.
Refractive index contrast:
Beneficial effect of the present invention is: the 7 core distributed architectures that 1, adopt 1 central core district and 6 uniform outer core regions, fibre core spacing between adjacent core region is identical, each outer core region is identical with the spacer in central core district, the laying of each core region is reasonable, and the optical fiber internal stress distributes relatively even; Simultaneously optical fiber structure is compact, has improved traffic density, is specially adapted to use under the intensive wiring such as data center or long-distance optical fiber communication environment; 2, on waveguide design, design specific core cladding structure, and the sagging covering of each core region is close or linking mutually, be equivalent to increase the sagging ring width of each core region, make the excellent bending resistance that possesses of multi-core fiber, very little to the cross talk effects between any fuse, crosstalk performance meets the bit error rate requirement of high-speed transfer fully under bending condition, possess good practicality; 3, take into account geometry and the optical property of optical fiber, can realize counter-bending, the purposes such as dispersion, polarization mode dispersion and low-loss of single mode transport and control optical fiber, the cutoff wavelength of optical fiber, dispersion, mould field, PMD etc. can compatibility optical fiber G.652, on attenuation this multi-core fiber can compatible low-water-peak fiber C/D G.652, reach the requirement of multi-core fiber communication; 4, the symmetrical structure of fibre core, can be convenient to the welding operation between multi-core fiber.
Description of drawings
Fig. 1 is fibre profile and the refractive index structures figure of first kind embodiment of the present invention.
Fig. 2 is fibre profile and the refractive index structures figure of Equations of The Second Kind embodiment of the present invention.
Embodiment
The present invention is further illustrated below in conjunction with drawings and Examples.
Include 7 core regions and 1 total surrounding layer, described 7 core regions consist of 1 central core district and 6 outer core regions that are distributed on central core district periphery, the core cladding structure of each core region is identical, described core region is divided into two class waveguiding structures, first kind waveguiding structure includes fibre core 1 and holds the inner cladding 2 of sandwich layer, sagging covering 3, and remainder is total surrounding layer; The Equations of The Second Kind waveguiding structure includes fibre core 1 and holds the inner cladding 2 of sandwich layer, sagging covering 3 and surrounding layer 4, and remainder is total surrounding layer.Fibre core spacing between any two adjacent core regions is identical.
Shown in table 11 is the first kind 7 core fibres of the present invention to No. 3 samples, and 4 to No. 6 samples are Equations of The Second Kind 7 core fibres.The described crossfire value of table 1 is additional crossfire value after 1550nm wavelength signals power transmits 100 kilometers by any two fuses, and its unit is dB.Its structural parameters and test result show that each sample is good in the index of crosstalking without under bending condition, reached the realistic scale (namely be better than in document-40dB level) of document record, and the crooked 1 circle loss of 1550nm is better than the G.657 0.5dB of A2 standard and B2 standard.The △ of 4 to No. 6 samples in table 1
4In fact with △
2Identical, therefore do not mark occurrence.
Table 1
Claims (12)
1. multi-core fiber, include 7 core regions and 1 total surrounding layer, it is characterized in that described 7 core regions consist of 1 central core district and 6 outer core regions that are distributed on central core district periphery, the core cladding structure of each core region is identical, fibre core spacing between any two adjacent core regions is identical, described core region includes fibre core and holds the inner cladding of sandwich layer, sagging covering, and remainder is total surrounding layer.
2. multi-core fiber as claimed in claim 1, is characterized in that described fiber core radius a is 4.25 ~ 5.25 μ m, sandwich layer refractive index contrast △
1Be 0.16% ~ 0.33%.
3. multi-core fiber as claimed in claim 1 or 2, is characterized in that described inner cladding radius b is 9 ~ 14 μ m, inner cladding refractive index contrast △
2For-0.05% ~+0.05%.
4. multi-core fiber as claimed in claim 1 or 2, is characterized in that described sagging cladding radius c is 16.5 ~ 22.5 μ m, and covering refractive index contrast △ sink
3For-0.2% ~-0.4%.
5. multi-core fiber as claimed in claim 4, is characterized in that the fibre core spacing P between described any two adjacent core regions is 33 ~ 45 μ m.
6. multi-core fiber as claimed in claim 4, is characterized in that described sagging covering is outside equipped with surrounding layer, and described surrounding layer radius d is 17.5 ~ 23.5 μ m, surrounding layer refractive index contrast △
4For-0.05% ~+0.05%.
7. multi-core fiber as claimed in claim 6, is characterized in that the fibre core spacing P between described any two adjacent core regions is 35 ~ 47 μ m.
8. multi-core fiber as claimed in claim 1 or 2, is characterized in that described total surrounding layer is the pure silicon dioxide glassy layer, and the external diameter 2r of total surrounding layer is 125 ± 1.5 μ m.
9. multi-core fiber as claimed in claim 1 or 2, is characterized in that the mode field diameter of described optical fiber is 9.5 ~ 11 μ m near 1550nm, and fiber cut off wavelength is less than or equal to 1400nm, and zero-dispersion wavelength is in 1260 ~ 1350nm scope.
10. multi-core fiber as claimed in claim 9, it is characterized in that described optical fiber at 1550nm wavelength place for around 7.5 millimeters bending radius, around the crooked added losses of 1 any one core region of circle, being less than or equal to 0.23dB.
11. multi-core fiber as claimed in claim 5, while it is characterized in that fibre core spacing P equals 35 microns, signal power at 1550nm wavelength place after 100 kilometers of any two fibre cores transmission additional crosstalking be less than or equal to-69.7dB; Signal power at 1625nm wavelength place after 100 kilometers of any two fuses transmission additional crosstalking be less than or equal to-63.1dB.
12. multi-core fiber as claimed in claim 7, while it is characterized in that fibre core spacing P equals 42 microns, signal power at 1550nm wavelength place after 100 kilometers of any two fibre cores transmission additional crosstalking be less than or equal to-86.3dB; Signal power at 1625nm wavelength place after 100 kilometers of any two fuses transmission additional crosstalking be less than or equal to-78.5dB.
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698843A (en) * | 2013-12-18 | 2014-04-02 | 江苏大学 | Low-degeneracy few-mode fiber |
| CN104678484A (en) * | 2014-12-26 | 2015-06-03 | 长飞光纤光缆股份有限公司 | Multi-fiber core single-mode optical fiber and manufacturing method thereof |
| CN105425335A (en) * | 2015-12-17 | 2016-03-23 | 长飞光纤光缆股份有限公司 | Anti-bending multi-core optical fiber for communication |
| CN106371166A (en) * | 2016-11-15 | 2017-02-01 | 长飞光纤光缆股份有限公司 | Hybrid multi-core optical fiber |
| CN109061793A (en) * | 2018-08-31 | 2018-12-21 | 长飞光纤光缆股份有限公司 | Seven core path single mode optical fibers of one kind and its manufacturing method |
| CN111897045A (en) * | 2020-09-17 | 2020-11-06 | 长飞光纤光缆股份有限公司 | Anti-bending multi-core optical fiber |
| EP3754391A1 (en) | 2019-06-20 | 2020-12-23 | Yangtze Optical Fibre and Cable Joint Stock Limited Company | Polarization-maintaining multi-core fiber |
| EP3754390A1 (en) | 2019-06-20 | 2020-12-23 | Yangtze Optical Fibre and Cable Joint Stock Limited Company | Polarization-maintaining multi-core fiber |
| JP2021089917A (en) * | 2019-12-02 | 2021-06-10 | 株式会社Ｋｄｄｉ総合研究所 | Optical amplifier |
| CN113325510A (en) * | 2021-06-23 | 2021-08-31 | 长飞光纤光缆股份有限公司 | Multi-core optical fiber and optical cable easy to branch |
| JP7508294B2 (ja) | 2020-07-09 | 2024-07-01 | 古河電気工業株式会社 | マルチコアファイバおよびその製造方法 |
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| CN102193136A (en) * | 2010-03-10 | 2011-09-21 | 住友电气工业株式会社 | Multi-core optical fiber |
| WO2012063775A1 (en) * | 2010-11-08 | 2012-05-18 | 株式会社フジクラ | Multicore fiber |
| JP2012181282A (en) * | 2011-02-28 | 2012-09-20 | Fujikura Ltd | Multi-core fiber |
| US20130183016A1 (en) * | 2010-03-16 | 2013-07-18 | Furukawa Electric Co., Ltd. | Multi-core optical fiber and method of manufacturing the same |
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| CN102193136A (en) * | 2010-03-10 | 2011-09-21 | 住友电气工业株式会社 | Multi-core optical fiber |
| US20130183016A1 (en) * | 2010-03-16 | 2013-07-18 | Furukawa Electric Co., Ltd. | Multi-core optical fiber and method of manufacturing the same |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698843A (en) * | 2013-12-18 | 2014-04-02 | 江苏大学 | Low-degeneracy few-mode fiber |
| CN104678484A (en) * | 2014-12-26 | 2015-06-03 | 长飞光纤光缆股份有限公司 | Multi-fiber core single-mode optical fiber and manufacturing method thereof |
| CN104678484B (en) * | 2014-12-26 | 2018-08-07 | 长飞光纤光缆股份有限公司 | A kind of more core single-mode fibres and its manufacturing method |
| CN105425335A (en) * | 2015-12-17 | 2016-03-23 | 长飞光纤光缆股份有限公司 | Anti-bending multi-core optical fiber for communication |
| CN105425335B (en) * | 2015-12-17 | 2019-04-16 | 长飞光纤光缆股份有限公司 | A kind of communication bending resistance multi-core optical fiber |
| CN106371166A (en) * | 2016-11-15 | 2017-02-01 | 长飞光纤光缆股份有限公司 | Hybrid multi-core optical fiber |
| CN109061793A (en) * | 2018-08-31 | 2018-12-21 | 长飞光纤光缆股份有限公司 | Seven core path single mode optical fibers of one kind and its manufacturing method |
| EP3754391A1 (en) | 2019-06-20 | 2020-12-23 | Yangtze Optical Fibre and Cable Joint Stock Limited Company | Polarization-maintaining multi-core fiber |
| EP3754390A1 (en) | 2019-06-20 | 2020-12-23 | Yangtze Optical Fibre and Cable Joint Stock Limited Company | Polarization-maintaining multi-core fiber |
| US11550097B2 (en) | 2019-06-20 | 2023-01-10 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Array-type polarization-maintaining multi-core fiber |
| US11614581B2 (en) | 2019-06-20 | 2023-03-28 | Yangtze Optical Fibre And Cable Joint Stock Limited Company | Polarization-maintaining multi-core fiber |
| JP2021089917A (en) * | 2019-12-02 | 2021-06-10 | 株式会社Ｋｄｄｉ総合研究所 | Optical amplifier |
| JP7221855B2 (en) | 2019-12-02 | 2023-02-14 | 株式会社Ｋｄｄｉ総合研究所 | optical amplifier |
| JP7508294B2 (ja) | 2020-07-09 | 2024-07-01 | 古河電気工業株式会社 | マルチコアファイバおよびその製造方法 |
| CN111897045A (en) * | 2020-09-17 | 2020-11-06 | 长飞光纤光缆股份有限公司 | Anti-bending multi-core optical fiber |
| CN113325510A (en) * | 2021-06-23 | 2021-08-31 | 长飞光纤光缆股份有限公司 | Multi-core optical fiber and optical cable easy to branch |
| CN113325510B (en) * | 2021-06-23 | 2022-03-18 | 长飞光纤光缆股份有限公司 | Multi-core optical fiber and optical cable easy to branch |
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