CN113589422A - Easily-identified multi-core optical fiber - Google Patents
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- CN113589422A CN113589422A CN202110695986.9A CN202110695986A CN113589422A CN 113589422 A CN113589422 A CN 113589422A CN 202110695986 A CN202110695986 A CN 202110695986A CN 113589422 A CN113589422 A CN 113589422A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 64
- 239000000835 fiber Substances 0.000 claims abstract description 115
- 238000005253 cladding Methods 0.000 claims abstract description 65
- 239000010410 layer Substances 0.000 claims abstract description 48
- 239000012792 core layer Substances 0.000 claims abstract description 16
- 230000005540 biological transmission Effects 0.000 claims description 15
- 230000003287 optical effect Effects 0.000 claims description 12
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- 230000000994 depressogenic effect Effects 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- 210000001503 joint Anatomy 0.000 abstract description 2
- 238000004891 communication Methods 0.000 description 9
- 238000005516 engineering process Methods 0.000 description 5
- 239000002019 doping agent Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 108700041286 delta Proteins 0.000 description 3
- 238000009826 distribution Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 230000005684 electric field Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 230000007847 structural defect Effects 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000011800 void material Substances 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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- 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
- G02B6/02004—Optical fibres with cladding with or without a coating characterised by the core effective area or mode field radius
- G02B6/02009—Large effective area or mode field radius, e.g. to reduce nonlinear effects in single mode 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
- G02B6/03638—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 having 3 layers only
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Abstract
The invention relates to a multi-core optical fiber easy to identify, which comprises a common outer cladding layer and a plurality of fiber cores arranged in the common outer cladding layer, and is characterized in that the fiber cores are eight, the fiber cores comprise a central fiber core and seven outer fiber cores, the central fiber core is arranged in the center of the common outer cladding layer, the other seven fiber cores are arranged on the periphery of the central fiber core at equal intervals around the central fiber core, the seven outer fiber cores are sequentially arranged along the circumferential direction, the interval radian between every two adjacent outer fiber cores from the first to the seventh is equal, the interval radian between the first outer fiber core and the seventh outer fiber core is larger than that between every two adjacent outer fiber cores from the first to the seventh, the equal interval d1 between the seven outer fiber cores and the central fiber core is 35-43 mu m, the core interval d2 between the seven outer fiber cores is 31-37 mu m, the eight fiber cores are homogeneous single-mode fibers, and the fiber cores respectively comprise a core layer, a core layer and a fiber core layer, The common outer cladding is the outer cladding of each fiber core. The invention has reasonable structure, easy identification and butt joint, low attenuation and small crosstalk between cores.
Description
Technical Field
The invention relates to a multi-core optical fiber easy to identify, and belongs to the technical field of optical fiber communication transmission.
Background
Optical communication plays an extremely important supporting role in the information industry due to its characteristics of large capacity, high speed, long distance, and the like. In recent years, with the continuous development of erbium-doped fiber amplifiers, wavelength division multiplexing, and high-spectrum-efficiency coding techniques, the transmission capacity of optical communication systems is on a continuous increase trend. However, as the transmission capacity of single-mode optical fibers has gradually approached the shannon limit, the development of optical communication technology tends to be slow (as shown in fig. 3). In order to cope with the current transmission capacity crisis and to maximize the system spectral efficiency, the space division multiplexing optical fiber research is actively being conducted.
The space division multiplexing and the module division multiplexing technology can break the traditional Shannon limit, realize the transmission with higher bandwidth, and is the best method for solving the problem of transmission capacity. The optical fibers supporting the multiplexing technology are multi-core optical fibers and few-mode optical fibers. Experiments show that signals can be transmitted in more than one spatial propagation mode by using few-mode optical fibers in combination with the MIMO technology. And the MIMO technology can compensate for mutual coupling between modes, separating each spatial mode at the receiving end. US8948559, US8848285, US8837892, US8705922 and chinese patents CN104067152, CN103946729, etc. propose few-mode fibers with parabolic or step-shaped profiles, but they have respective advantages and disadvantages. Few-mode fibers with stepped profiles are simple to manufacture and easy to mass produce, but typically have a large DGD, even up to several thousand ps/km. Few-mode optical fibers with parabolic profiles have more adjustable parameters, so that the intermodal crosstalk and the DGD reach low levels, but the preparation process is complex, the alpha parameter is difficult to control accurately and uniformly, and the repeatability is not high. And the small fluctuation of the refractive index profile along the axial direction of the prefabricated rod can cause the obvious change of the DGD at different sections of the optical fiber.
In recent years, space division multiplexing systems based on multi-core fiber (MCF) have gradually emerged. The present invention is expected as an optical transmission path capable of transmitting large-capacity information. 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 local connection of communication lines and high-speed communication, and the like.
At present, the transmission rate of many enterprise data centers is still 10Gbps, and the traditional 10G usually adopts an SFP + optical module and a dual-core LC interface for interconnection; the 40G ethernet specification requires 8-core interconnection, 4-fiber 4-receive, and a 12-core cable routing solution is adopted, each channel has 4 dedicated transmitting fibers and 4 dedicated receiving fibers, and the middle 4 fibers remain idle.
If a multi-core fiber (such as 8-core fiber) is used for data center interconnection, the number of used fibers can be greatly reduced, and the access density is improved. However, in practical applications, when the multicore fiber needs to identify the receiving and sending cores, or is connected to other multicore fibers, optical devices, etc., it is necessary to connect a specific core of the multicore fiber to a designated core of another multicore fiber and an optical device, however, at present, the cores of most of the multicore fibers are arranged at equal intervals, or are arranged in an axisymmetric or rotationally symmetric manner, and such distribution has the advantages of ensuring the uniformity of the core intervals, facilitating the fiber preparation and controlling crosstalk between cores, but having a problem that it is difficult to identify each specific core.
Some patent documents have proposed solutions, such as patents CN102257415B, CN102449515B, in which a visual recognition mark for recognizing the position of a specific core is additionally added to a cladding of an optical fiber, and the visual recognition mark is provided at a position where the symmetry of a multicore fiber is broken. However, these solutions set a number of limitations on the marking core, CN102257415B requiring marking as a void and CN102449515B requiring that at least a part of the visual identification marking has a higher refractive index than the refractive index of the cladding.
The method described in patent CN202433554U is used as a mark for identification in air hole-assisted optical fiber, in which the surrounding air hole layers of a part of the core have different thickness or density from those of the air hole layers of other cores, but if the air hole density or thickness is not uniform, the air holes may collapse, crack, merge or disappear during drawing the optical fiber, resulting in 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:
relative refractive index DeltaniIs the relative refractive index difference between the layers of the fiber (except the outer cladding) and pure silica.
The layer closest to the central axis is defined as a core layer and the outermost layer of the optical fiber, namely a pure silica layer, is an optical fiber outer cladding layer according to the change of the refractive index from the central axis of the optical fiber core.
Relative refractive index difference Deltan of each layer of optical fiberiDefined by the following equation:
wherein n isiIs the refractive index of the layers (except the cladding) of the optical fiber, ncIs the refractive index of the outer cladding, i.e. the refractive index of pure silica.
The relative refractive index difference contribution Δ Ge of the Ge doping of the core layer of the optical fiber is defined by the following equation:
wherein n isGeGe dopant for the core, in pure silica doped without other dopants, causes a change in the refractive index of the silica glass, where ncIs the refractive index of the outer cladding, i.e. the refractive index of pure silica.
The relative refractive index difference contribution Δ F of the optical fiber core layer F doping is defined by the following equation:
wherein n isFF dopant as core, in pure silica doped without other dopants, causes a change in the refractive index of the silica glass, where ncIs the refractive index of the outer cladding, i.e. the refractive index of pure silica.
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.
In general, we test the mode field diameter MFD of an optical fiber by a far-field variable aperture method, and determine an equivalent formula of the mode field diameter as follows:
wherein λ is the test wavelength, D is the distance from the plane of the aperture stop to the end face of the optical fiber, x is the radius of the aperture stop, and a (x) is the complementary aperture power transfer function.
The invention aims to solve the technical problem of providing an easily-identified multi-core optical fiber aiming at the defects in the prior art, which has the advantages of reasonable structural arrangement, easy identification and butt joint, low attenuation and small crosstalk between cores.
The technical scheme adopted by the invention for solving the problems is as follows: the fiber core comprises a common outer cladding layer and a plurality of fiber cores arranged in the common outer cladding layer, and is characterized in that the fiber cores are eight, the fiber cores comprise a central fiber core and seven outer fiber cores, the central fiber core is arranged in the center of the common outer cladding layer, the other seven fiber cores are arranged on the periphery of the central fiber core at equal intervals around the central fiber core, the seven outer fiber cores are sequentially arranged along the circumferential direction, the interval radians (circumferential intervals) between the two adjacent outer fiber cores from the first to the seventh are equal, the interval radians (circumferential intervals) between the first outer fiber core and the seventh outer fiber core, namely the interval radians between the outer fiber cores at the head end and the tail end are larger than the interval radians between the two adjacent outer fiber cores from the first to the seventh, the equal intervals d1 between the seven outer fiber cores and the central fiber core are 35-43 mu m, the core intervals d2 between the seven outer fiber cores are 31-37 mu m, and the eight fiber cores are homogeneous single-mode fibers, each fiber core sequentially comprises a core layer, an inner cladding layer and a sunken cladding layer from inside to outside, and the common outer cladding layer is the outer cladding layer of each fiber core.
According to the scheme, the radian of the interval between the first outer fiber core and the seventh outer fiber core is n/4 (45 degrees), and the radian of the interval between the first outer fiber core and the seventh outer fiber core is n/2 (90 degrees); and the distance d3 between the first outer fiber core and the seventh outer fiber core is 38-74 um.
According to the scheme, the radius R1 of the core layer is 3.0-4.5 microns, the relative refractive index difference delta 1 of the core layer relative to the common outer cladding layer is 0.28-0.42%, the radius R2 of the inner cladding layer is 5.2-9.2 microns, the relative refractive index difference delta 2 of the inner cladding layer relative to the common outer cladding layer is-0.12%, the radius R3 of the sunken cladding layer is 7.5-12.5 microns, the relative refractive index difference delta 3 of the sunken cladding layer relative to the common outer cladding layer is-0.35% -0.65%, the diameter of the common outer cladding layer is 125 microns, and the common outer cladding layer is a pure silica glass layer.
According to the scheme, the optical fiber meets the requirement of multi-core parallel transmission of optical signals in an O wave band and a C wave band.
According to the scheme, at the wavelength of 1310nm and 1550nm, the inter-core crosstalk between any fiber core and the adjacent side core of the fiber is < -30dB/10km, and the inter-core crosstalk between the fiber cores except the adjacent side cores is < -40dB/10 km. Preferably, the intercore crosstalk between any fiber core and the adjacent side core is < -35dB/10km, and the intercore crosstalk between the fiber cores outside the adjacent side cores is < -45dB/10 km.
According to the scheme, the attenuation of each channel of the optical fiber at the wavelength of 1310nm is less than or equal to 0.5dB/km, and the attenuation of each channel at the wavelength of 1550nm is less than or equal to 3.0 dB/km. Preferably, the attenuation of each channel of the optical fiber at the wavelength of 1310nm is less than or equal to 0.4dB/km, and the attenuation of each channel at the wavelength of 1550nm is less than or equal to 2.0 dB/km.
According to the scheme, under the condition that the optical fiber is bent for 100 circles with the diameter of 60mm, the macrobend loss of each channel at the position with the wavelength of 1310nm is less than or equal to 0.05dB, and the macrobend loss at the position with the wavelength of 1550nm is less than or equal to 0.05 dB.
According to the scheme, the optical cable cut-off wavelength of each channel of the optical fiber is less than or equal to 1260 nm.
According to the scheme, the mode field diameter of each channel of the optical fiber at 1310nm is 5-9 μm, and the mode field diameter at 1550nm is 7-10 μm.
The invention has the beneficial effects that: 1. under the condition of not increasing the marking core, the positioning of the identification multi-core optical fiber is achieved by arranging the outer fiber cores at unequal intervals from head to tail, the identification and the positioning of the multi-core optical fiber receiving and transmitting core are easy to realize during use, and the connection with other multi-core optical fibers, optical devices and the like is also convenient. 2. An eight-core structure with a middle core and 7 surrounding cores is adopted, the core distances between every two adjacent core areas except the head-tail outer core areas are the same, the spacing distances between every two adjacent core areas are the same, the core areas are reasonably arranged, and the internal stress distribution of the optical fiber is relatively uniform; meanwhile, the reasonable design of the refractive index of the fiber core enables the crosstalk between the cores and the macrobend loss of the optical fiber to be low, and the additional attenuation generated when the core layer is close to the edge of the cladding layer is greatly reduced. 3. The standard 125-micron optical fiber diameter is adopted, the compatibility with the current devices is kept, the occupied space volume of the standard 125-micron optical fiber diameter is kept the same as that of the common single-core optical fiber, the space division multiplexing transmission of C wave band and O wave band can be met, meanwhile, the optical fiber structure is compact, the communication density is improved, and the optical fiber is particularly suitable for being used in dense wiring occasions such as data centers.
Drawings
FIG. 1 is a radial schematic of one embodiment of the present invention.
FIG. 2 is a schematic representation of the refractive index profile of the core in one embodiment of the present invention.
Fig. 3 is a graph illustrating the transmission capacity increase curve of the current optical fiber communication system.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples.
The embodiment of the multi-core optical fiber of the invention is shown in fig. 1 and 2, and comprises a common outer cladding layer 9 and a plurality of cores arranged in the common outer cladding layer, wherein the number of the cores is eight, the cores comprise a central core 1 and seven outer cores 2-8, the central core is arranged in the center of the common outer cladding layer, the other seven cores are arranged around the central core at equal intervals, the seven outer cores are sequentially arranged along the circumferential direction, the radian intervals (circumferential intervals) between two adjacent outer cores from the first to the seventh are equal, namely n/4 (45 °), the intervals are also equal, the radian intervals (circumferential intervals) between the first outer core and the seventh outer core are larger than the radian intervals between two adjacent outer cores from the first to the seventh, namely n/2 (90 °), the radian intervals between the seven outer cores and the central core are d1, the core spacing between the seven outer cores is d2, the spacing between the first outer core and the seventh outer core is d3, the eight cores are homogeneous single-mode fibers and share the same outer cladding, each core sequentially comprises a core layer, an inner cladding and a sunken cladding from inside to outside, and the common outer cladding is the outer cladding of each core. The core layer radius is R1, the core layer refractive index difference relative to the common outer cladding layer is delta 1, the inner cladding layer radius is R2, the relative refractive index difference of the inner cladding layer relative to the common outer cladding layer is delta 2, the depressed cladding layer is coated outside the inner cladding layer, the depressed cladding layer radius is R3, the relative refractive index difference of the depressed cladding layer relative to the common outer cladding layer is delta 3, and the diameter of the common outer cladding layer is 125 +/-1.0 mu m.
The structural arrangement and the main performance parameters of the 5 fiber embodiments of the present invention are shown in tables 1 and 2.
Table 1: example Structure of eight-core optical fiber
| |
1 | 2 | 3 | 4 | 5 |
| Cladding diameter (mum) | 124.2 | 125.0 | 125.8 | 124.9 | 125.1 |
| Core spacing d1(μm) | 34.9 | 32.1 | 36.6 | 33.6 | 35.5 |
| Core spacing d2(μm) | 40.4 | 46.7 | 57.6 | 45.4 | 59.2 |
| Radius R1(μm) | 3.1 | 4.2 | 4.0 | 3.6 | 3.8 |
| Relative refractive index difference Δ 1 (%) | 0.29 | 0.39 | 0.37 | 0.33 | 0.31 |
| Radius R2(μm) | 7.84 | 8.60 | 7.10 | 6.56 | 7.11 |
| Relative refractive index difference Δ 2 (%) | 0.01 | -0.10 | 0.00 | 0.09 | -0.03 |
| Radius R3(μm) | 10.62 | 11.53 | 9.95 | 10.73 | 12.46 |
| Relative refractive index difference Δ 3 (%) | -0.44 | -0.42 | -0.45 | -0.48 | -0.46 |
Table 2: examples main performance parameters of eight-core optical fiber
Claims (9)
1. A multi-core optical fiber easy to identify comprises a common outer cladding and a plurality of fiber cores arranged in the common outer cladding, and is characterized in that the fiber cores are eight, the fiber cores comprise a central fiber core and seven outer fiber cores, the central fiber core is arranged in the center of the common outer cladding, the other seven fiber cores are arranged on the periphery of the central fiber core at equal intervals around the central fiber core, the seven outer fiber cores are sequentially arranged along the circumferential direction, the interval radian between two adjacent outer fiber cores from the first to the seventh is equal, the interval radian between the first outer fiber core and the seventh outer fiber core, namely the interval radian between the first end outer fiber core and the tail end outer fiber core is larger than the interval radian between the first adjacent outer fiber core and the seventh adjacent outer fiber core, the equal interval d1 between the seven outer fiber cores and the central fiber core is 35-43 mu m, the core interval d2 between the seven outer fiber cores is 31-37 mu m, and the eight fiber cores are homogeneous single-mode fibers, each fiber core sequentially comprises a core layer, an inner cladding layer and a sunken cladding layer from inside to outside, and the common outer cladding layer is the outer cladding layer of each fiber core.
2. An easily identifiable multicore optical fiber as defined in claim 1, wherein the radian of the interval between said first to seventh adjacent outer cores is l/4, and the radian of the interval between said first and seventh outer cores is l/2; and the distance d3 between the first outer fiber core and the seventh outer fiber core is 38-74 um.
3. The easily identifiable multicore fiber of claim 1 or 2, wherein the core layer has a radius R1 of 3.0 to 4.5 μm, the relative refractive index difference Δ 1 of the core layer with respect to the common outer cladding is 0.28 to 0.42%, the radius R2 of the inner cladding is 5.2 to 9.2 μm, the relative refractive index difference Δ 2 of the inner cladding with respect to the common outer cladding is-0.12 to 0.12%, the radius R3 of the depressed cladding is 7.5 to 12.5 μm, the relative refractive index difference Δ 3 of the depressed cladding with respect to the common outer cladding is-0.35 to-0.65%, the diameter of the common outer cladding is 125 μm, and the common outer cladding is a pure silica glass layer.
4. The easily identifiable multicore optical fiber of claim 3, wherein the optical fiber is adapted for multicore parallel transmission of optical signals in the O-band and the C-band.
5. The easily identifiable multicore optical fiber of claim 3, wherein the optical fiber has intercore crosstalk between any core and its neighboring core of < -30dB/10km and intercore crosstalk between cores other than the neighboring cores of < -40dB/10km at wavelengths of 1310nm and 1550 nm.
6. The easily identifiable multicore optical fiber of claim 3, wherein the optical fiber has an attenuation of 0.5dB/km or less for each channel at a wavelength of 1310nm and 3.0dB/km or less for each channel at a wavelength of 1550 nm.
7. The easily identifiable multicore optical fiber of claim 3, wherein the macrobending loss at a wavelength of 1310nm is less than or equal to 0.05dB and the macrobending loss at a wavelength of 1550nm is less than or equal to 0.05dB for each channel under a 60mm diameter bend of 100 turns.
8. The readily identifiable multicore optical fiber of claim 3, wherein the cable cutoff wavelength for each channel of said fiber is less than or equal to 1260 nm.
9. The easily identifiable multicore optical fiber of claim 3, wherein each channel of the optical fiber has a mode field diameter of 5 to 9 μm at 1310nm and a mode field diameter of 7 to 10 μm at 1550 nm.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023204956A1 (en) * | 2022-04-18 | 2023-10-26 | Corning Incorporated | Amplifying optical fibers |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130129292A1 (en) * | 2011-11-11 | 2013-05-23 | Sumitomo Electric Industries, Ltd. | Bi-directional optical communication method and multi-core optical fiber |
| US20130170804A1 (en) * | 2011-12-28 | 2013-07-04 | Sumitomo Electric Industries, Ltd. | Multi-core optical fiber |
| WO2018000232A1 (en) * | 2016-06-29 | 2018-01-04 | 华为技术有限公司 | Multi-core optical fibre |
| CN109581583A (en) * | 2018-11-21 | 2019-04-05 | 华中科技大学 | A kind of multi-clad and multicore optical fiber coupler |
| 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 |
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- 2021-06-23 CN CN202110695986.9A patent/CN113589422A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130129292A1 (en) * | 2011-11-11 | 2013-05-23 | Sumitomo Electric Industries, Ltd. | Bi-directional optical communication method and multi-core optical fiber |
| US20130170804A1 (en) * | 2011-12-28 | 2013-07-04 | Sumitomo Electric Industries, Ltd. | Multi-core optical fiber |
| WO2018000232A1 (en) * | 2016-06-29 | 2018-01-04 | 华为技术有限公司 | Multi-core optical fibre |
| CN109581583A (en) * | 2018-11-21 | 2019-04-05 | 华中科技大学 | A kind of multi-clad and multicore optical fiber coupler |
| 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 |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023204956A1 (en) * | 2022-04-18 | 2023-10-26 | Corning Incorporated | Amplifying optical fibers |
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