CN113777697A - Air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing - Google Patents
Air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing Download PDFInfo
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- CN113777697A CN113777697A CN202110977321.7A CN202110977321A CN113777697A CN 113777697 A CN113777697 A CN 113777697A CN 202110977321 A CN202110977321 A CN 202110977321A CN 113777697 A CN113777697 A CN 113777697A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 64
- 238000012545 processing Methods 0.000 title claims abstract description 25
- 239000000835 fiber Substances 0.000 claims abstract description 175
- 238000005253 cladding Methods 0.000 claims abstract description 31
- YBMRDBCBODYGJE-UHFFFAOYSA-N germanium dioxide Chemical group O=[Ge]=O YBMRDBCBODYGJE-UHFFFAOYSA-N 0.000 claims description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- 229940119177 germanium dioxide Drugs 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 5
- 239000000463 material Substances 0.000 claims description 4
- 230000005540 biological transmission Effects 0.000 abstract description 13
- 238000009826 distribution Methods 0.000 abstract description 3
- 238000004891 communication Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 8
- 230000003287 optical effect Effects 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
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- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
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- G—PHYSICS
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- 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
- G02B6/02295—Microstructured optical fibre
- G02B6/02314—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes
- G02B6/02319—Plurality of longitudinal structures extending along optical fibre axis, e.g. holes characterised by core or core-cladding interface features
- G02B6/02338—Structured core, e.g. core contains more than one material, non-constant refractive index distribution in core, asymmetric or non-circular elements in core unit, multiple cores, insertions between core and clad
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Abstract
The invention discloses an air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing, which comprises a fiber core and a cladding wrapping the fiber core; the optical fiber comprises a fiber core, a plurality of air hole auxiliary fiber cores and a plurality of optical fibers, wherein the fiber core comprises a main fiber core and the air hole auxiliary fiber cores; the main fiber core comprises an elliptical ring-shaped fiber core and a central fiber core positioned in the center of the elliptical ring-shaped fiber core; the refractive index of the central fiber core is the same as that of the air hole auxiliary fiber cores; the refractive index of the elliptical ring-shaped fiber core is greater than that of the central fiber core; the refractive index of the cladding is larger than that of the central fiber core and smaller than that of the elliptical ring-shaped fiber core. According to the invention, the elliptical annular fiber core and the air hole auxiliary fiber core are introduced, so that the circular symmetry of the refractive index distribution of the optical fibers is destroyed, the effective refractive index difference between the optical fibers is increased, the optical fibers support a plurality of high-order modes, and the mode field distribution form of the high-order modes is fixed, thereby ensuring multi-channel transmission; meanwhile, the optical fiber can reduce crosstalk between cores and reduce differential mode delay.
Description
Technical Field
The invention relates to the technical field of free space optical communication (FSO) and optical fiber communication, in particular to an air hole few-mode optical fiber supporting 14-mode low crosstalk and easy Multiple Input Multiple Output (MIMO) processing.
Background
In recent years, as various communication service flows caused by cloud computing, big data, streaming media and the like are increased explosively, the tolerance of optical fiber communication based on single-mode optical fiber is limited to approach to the shannon limit. With the rapid development of optical communication technology, the FSO-optical fiber hybrid communication system based on the optical fiber coupling technology has received more extensive attention at present. The FSO-optical fiber hybrid communication system is formed by optical fiber output and optical fiber input or direct laser output and optical fiber input, and has excellent performance in the aspects of expanding network bandwidth resources, improving communication flow and ensuring ultrahigh-speed and ultra-large-capacity transmission of information. Space division multiplexing systems applied to hybrid communication systems have been under considerable research in recent years due to their potential to reach ultra-high capacity and thus avoid so-called capacity compaction. The few-mode optical fiber of the space division multiplexing system has attracted great research interest to the scholars. The few-mode optical fiber can transmit a plurality of modes in the same fiber core, so that the transmission capacity of the single-core optical fiber is greatly increased, the limitation of the transmission capacity of the single-mode optical fiber is better overcome, and the few-mode optical fiber is suitable for the fields of free space optical communication and optical fiber communication.
In most few-mode fiber transmission systems, the problem of compensating for crosstalk between adjacent modes is solved with multiple-input-multiple-output (MIMO) techniques. However, as the number of transmission modes increases, the Differential Mode Delay (DMD) between the modes increases, and the problem of cross-talk between the cores increases. The additional cost in complexity and power consumption of MIMO processing systems increases dramatically. Therefore, there is a need to design a few-mode fiber with small inter-core crosstalk and smaller differential mode delay.
In order to meet the above requirements, researchers have designed few-mode optical fibers with special structures. The optical fiber with a special structure achieves the purpose of inhibiting crosstalk between cores by adopting different parameters between adjacent fiber cores and utilizing phase mismatch. Meanwhile, the ring core optical fiber can effectively split the refractive index space, so that mode crosstalk can be inhibited, and differential mode delay is reduced. The document Design of new-mode Optical fibers with air-hole structure for MIMO-less data transmission (Optical Engineering, 2020) proposes an air-hole-assisted ring Optical fiber structure for implementing MIMO-free processing, but the arrangement of the air holes and the cores of the structure has limitations, does not take into account process tolerances, has no dynamic flexibility, has a narrow application range, and still has problems in terms of mode crosstalk. The chinese patent application No. 201921149747.8 proposes a few-mode optical fiber with an air-slot auxiliary structure, which can improve the limiting capability of each unit to the mode field, thereby suppressing crosstalk between cores. Chinese patent application No. 201920056351.2 proposes a ring-shaped optical fiber, which reduces crosstalk between cores by changing the refractive index of a specific mode in a manner of combining a low refractive index middle core and a high refractive index ring. However, the introduction of a higher index ring results in a substantial reduction in the transmission modes supported in the core. And with the rapid increase of the number of fiber cores accommodated in the few-mode optical fiber, the introduction of a plurality of air groove structures into the optical fiber to inhibit the crosstalk between the optical fiber cores can no longer meet the existing design requirements, and the actual manufacturing difficulty of the few-mode optical fiber is increased.
In summary, the existing few-mode optical fiber has the problems of increased differential mode delay between modes and crosstalk between cores along with the increase of the number of transmission modes, and simultaneously, the complexity of the MIMO processing system is increased.
Disclosure of Invention
The invention provides an air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing, and aims to solve the technical problems that in a space division multiplexing system using few-mode optical fiber transmission, with the increase of the number of transmission modes, the problems of differential mode delay and crosstalk between cores between the modes are aggravated, and the complexity of the MIMO processing system is improved.
In order to solve the technical problems, the invention provides the following technical scheme:
an air hole few-mode fiber supporting 14-mode low crosstalk and easy MIMO processing, the air hole few-mode fiber comprising a core and a cladding surrounding the core; wherein the content of the first and second substances,
the fiber core comprises a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is positioned in the center of the air hole few-mode optical fiber, and the air hole auxiliary fiber cores are distributed around the main fiber core; the main fiber core comprises an elliptical ring-shaped fiber core and a central fiber core positioned in the center of the elliptical ring-shaped fiber core;
the refractive index of the central fiber core is the same as that of the air hole auxiliary fiber cores; the refractive index of the elliptical ring-shaped fiber core is greater than that of the central fiber core; the refractive index of the cladding is greater than the refractive index of the central core, and the refractive index of the cladding is less than the refractive index of the elliptical ring-shaped core.
Optionally, the number of the air hole auxiliary fiber cores is four; the first air hole auxiliary fiber core and the second air hole auxiliary fiber core are symmetrically distributed above and below the main fiber core; the third air hole auxiliary fiber core and the fourth air hole auxiliary fiber core are symmetrically distributed on the left side and the right side of the main fiber core.
Optionally, ellipticities of major axes of the inner and outer ellipses of the elliptical ring core to the minor axis are 1.18 and 1.75, respectively; the distance between the first air hole auxiliary fiber core and the second air hole auxiliary fiber core and the elliptical ring-shaped fiber core is 1 mu m; the distance between the third air hole auxiliary fiber core and the distance between the fourth air hole auxiliary fiber core and the elliptical ring-shaped fiber core are both 0.3 mu m.
Optionally, the diameters of the air hole auxiliary fiber cores are the same and are all 5 μm to 15 μm;
the diameter of the cladding is between 62.5 μm and 125 μm.
Optionally, the refractive index of the central core and the plurality of air hole assisting cores is 1.
Optionally, the refractive index of the elliptical ring core is 1.478.
Optionally, the material of the elliptical ring-shaped core is germanium dioxide doped quartz glass.
Optionally, the germanium dioxide doping concentration in the germanium dioxide doped quartz glass is 23%.
Optionally, the cladding has a refractive index of 1.444.
Optionally, the material of the cladding is quartz glass.
The technical scheme provided by the invention has the beneficial effects that at least:
the air hole few-mode optical fiber breaks the circular symmetry of the refractive index distribution of the optical fiber by introducing the elliptical annular main fiber core and the air hole auxiliary fiber core, increases the effective refractive index difference between the optical fibers, and enables the optical fibers to support LPy 01、LPx 01、LPy 11a、LPx 11a、LPx 11b、LPy 11b、LPx 21b、LPy 21b、LPx 21a、LPy 21a、LPy 31b、LPx 31b、LPx 31a、LPy 31aThe 14 high-order modes ensure the characteristics of multi-channel transmission, remarkably reduce the crosstalk between cores, effectively reduce the differential delay between the modes, reduce the complexity of a receiving end MIMO system and are suitable for the technical field of free space optical communication and optical fiber communication.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic cross-sectional view of an air-hole few-mode optical fiber supporting 14-mode low crosstalk and MIMO processing according to an embodiment of the present invention;
fig. 2 is a refractive index profile of an air-hole few-mode fiber supporting 14-mode low crosstalk and MIMO processing according to an embodiment of the present invention.
Description of reference numerals:
1. a central core;
2. an elliptical ring-shaped fiber core;
3. a third air hole assists the fiber core;
4. a second air hole assists the fiber core;
5. a fourth air hole assists the fiber core;
6. a first air hole auxiliary fiber core;
7. and (7) cladding.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
First embodiment
The embodiment provides an air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing, as shown in fig. 1, the air hole few-mode optical fiber comprises a fiber core and a cladding 7 wrapping the fiber core; wherein the content of the first and second substances,
the fiber core comprises a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is positioned in the center of the air hole few-mode optical fiber, and the air hole auxiliary fiber cores are distributed around the main fiber core; the main fiber core comprises an elliptical ring-shaped fiber core 2 and a central fiber core 1 positioned in the center of the elliptical ring-shaped fiber core 2;
the refractive index of the central fiber core 1 is the same as that of the air hole auxiliary fiber cores; the refractive index of the elliptical ring-shaped fiber core 2 is greater than that of the central fiber core 1; the refractive index of the cladding 7 is greater than that of the central core 1, and the refractive index of the cladding 7 is less than that of the elliptical ring core 2.
Specifically, in this embodiment, the number of the air hole auxiliary cores is four, and the air hole auxiliary cores include a first air hole auxiliary core 6, a second air hole auxiliary core 4, a third air hole auxiliary core 3, and a fourth air hole auxiliary core 5; the first air hole auxiliary fiber core 6 and the second air hole auxiliary fiber core 4 are symmetrically distributed above and below the main fiber core; the third air hole auxiliary core 3 and the fourth air hole auxiliary core 5 are symmetrically distributed on the left and right sides of the main core. Ellipticity ratios of the major axis to the minor axis of the inner ellipse and the outer ellipse of the elliptical ring-shaped fiber core 2 are respectively 1.18 and 1.75; the distance between the first air hole auxiliary fiber core 6 and the second air hole auxiliary fiber core 4 and the elliptical ring-shaped fiber core 2 can be 1 μm; the distance between the third air hole auxiliary core 3 and the fourth air hole auxiliary core 5 and the elliptical ring core 2 may be 0.3 μm. The diameters of the auxiliary fiber cores of the four air holes are the same and are all 5 micrometers; the diameter of the cladding 7 is 62.5 μm.
Further, in this embodiment, the refractive index profile of the air hole few-mode fiber is shown in fig. 2, where the refractive index of the central core 1 and the refractive index of the four air hole auxiliary cores are all 1. The refractive index of the elliptical ring core 2 is 1.478. The elliptical ring-shaped fiber core 2 is made of germanium dioxide doped quartz glass, wherein the doping concentration of the germanium dioxide is 23%; the cladding 7 has a refractive index of 1.444 and is made of quartz glass.
Second embodiment
The embodiment provides an air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing, as shown in fig. 1, the air hole few-mode optical fiber comprises a fiber core and a cladding 7 wrapping the fiber core; wherein the content of the first and second substances,
the fiber core comprises a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is positioned in the center of the air hole few-mode optical fiber, and the air hole auxiliary fiber cores are distributed around the main fiber core; the main fiber core comprises an elliptical ring-shaped fiber core 2 and a central fiber core 1 positioned in the center of the elliptical ring-shaped fiber core 2;
the refractive index of the central fiber core 1 is the same as that of the air hole auxiliary fiber cores; the refractive index of the elliptical ring-shaped fiber core 2 is greater than that of the central fiber core 1; the refractive index of the cladding 7 is greater than that of the central core 1, and the refractive index of the cladding 7 is less than that of the elliptical ring core 2.
Specifically, in this embodiment, the number of the air hole auxiliary cores is four, and the air hole auxiliary cores include a first air hole auxiliary core 6, a second air hole auxiliary core 4, a third air hole auxiliary core 3, and a fourth air hole auxiliary core 5; the first air hole auxiliary fiber core 6 and the second air hole auxiliary fiber core 4 are symmetrically distributed above and below the main fiber core; the third air hole auxiliary core 3 and the fourth air hole auxiliary core 5 are symmetrically distributed on the left and right sides of the main core. Ellipticity ratios of the major axis to the minor axis of the inner ellipse and the outer ellipse of the elliptical ring-shaped fiber core 2 are respectively 1.18 and 1.75; the distance between the first air hole auxiliary fiber core 6 and the second air hole auxiliary fiber core 4 and the elliptical ring-shaped fiber core 2 can be 1 μm; the distance between the third air hole auxiliary core 3 and the fourth air hole auxiliary core 5 and the elliptical ring core 2 may be 0.3 μm. The diameters of the auxiliary fiber cores of the four air holes are the same and are all 10 micrometers; the diameter of the cladding 7 is 100 μm.
Further, in this embodiment, the refractive index profile of the air hole few-mode fiber is shown in fig. 2, where the refractive index of the central core 1 and the refractive index of the four air hole auxiliary cores are all 1. The refractive index of the elliptical ring core 2 is 1.478. The elliptical ring-shaped fiber core 2 is made of germanium dioxide doped quartz glass, wherein the doping concentration of the germanium dioxide is 23%; the cladding 7 has a refractive index of 1.444 and is made of quartz glass.
Third embodiment
The embodiment provides an air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing, as shown in fig. 1, the air hole few-mode optical fiber comprises a fiber core and a cladding 7 wrapping the fiber core; wherein the content of the first and second substances,
the fiber core comprises a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is positioned in the center of the air hole few-mode optical fiber, and the air hole auxiliary fiber cores are distributed around the main fiber core; the main fiber core comprises an elliptical ring-shaped fiber core 2 and a central fiber core 1 positioned in the center of the elliptical ring-shaped fiber core 2;
the refractive index of the central fiber core 1 is the same as that of the air hole auxiliary fiber cores; the refractive index of the elliptical ring-shaped fiber core 2 is greater than that of the central fiber core 1; the refractive index of the cladding 7 is greater than that of the central core 1, and the refractive index of the cladding 7 is less than that of the elliptical ring core 2.
Specifically, in this embodiment, the number of the air hole auxiliary cores is four, and the air hole auxiliary cores include a first air hole auxiliary core 6, a second air hole auxiliary core 4, a third air hole auxiliary core 3, and a fourth air hole auxiliary core 5; the first air hole auxiliary fiber core 6 and the second air hole auxiliary fiber core 4 are symmetrically distributed above and below the main fiber core; the third air hole auxiliary core 3 and the fourth air hole auxiliary core 5 are symmetrically distributed on the left and right sides of the main core. Ellipticity ratios of the major axis to the minor axis of the inner ellipse and the outer ellipse of the elliptical ring-shaped fiber core 2 are respectively 1.18 and 1.75; the distance between the first air hole auxiliary fiber core 6 and the second air hole auxiliary fiber core 4 and the elliptical ring-shaped fiber core 2 can be 1 μm; the distance between the third air hole auxiliary core 3 and the fourth air hole auxiliary core 5 and the elliptical ring core 2 may be 0.3 μm. The diameters of the auxiliary fiber cores of the four air holes are the same and are all 15 micrometers; the diameter of the cladding 7 is 125 μm.
Further, in this embodiment, the refractive index profile of the air hole few-mode fiber is shown in fig. 2, where the refractive index of the central core 1 and the refractive index of the four air hole auxiliary cores are all 1. The refractive index of the elliptical ring core 2 is 1.478. The elliptical ring-shaped fiber core 2 is made of germanium dioxide doped quartz glass, wherein the doping concentration of the germanium dioxide is 23%; the cladding 7 has a refractive index of 1.444 and is made of quartz glass.
The test data for the optical fibers of the above examples are shown in table 1.
TABLE 1 fiber test data for various examples
| Example numbering | A | II | III |
| Pore diameter (mum) | 5 | 10 | 15 |
| Cladding diameter (mum) | 62.5 | 100 | 125 |
| LPy 01-LPx 01 | 0.000122 | 0.000127 | 0.000131 |
| LPy 11a-LPx 11a | 0.000245 | 0.000254 | 0.000259 |
| LPx 11b-LPy 11b | 0.000692 | 0.000718 | 0.000735 |
| LPx 21b-LPy 21b | 0.000150 | 0.000161 | 0.000169 |
| LPx 21a-LPy 21a | 0.000667 | 0.000683 | 0.000695 |
| LPy 31b-LPx 31b | 0.000444 | 0.000463 | 0.000474 |
| LPx 31a-LPy 31a | 0.000628 | 0.000631 | 0.000639 |
Through test data, the air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing provided by the invention is characterized by supporting LP11、LP21、LP31And the 14 high-order modes are equal, so that multi-channel transmission is ensured, and the effective refractive index difference between the optical fiber modes is increased. Can reduce the cross talk between cores and between modesThe differential delay is effectively reduced, and meanwhile, the complexity of the MIMO system at the receiving end is obviously reduced.
Moreover, it is noted that, in this document, relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that while the above describes a preferred embodiment of the invention, it will be appreciated by those skilled in the art that, once the basic inventive concepts have been learned, numerous changes and modifications may be made without departing from the principles of the invention, which shall be deemed to be within the scope of the invention. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the embodiments of the invention.
Claims (10)
1. An air hole few-mode optical fiber supporting 14-mode low crosstalk and easy MIMO processing, characterized in that the air hole few-mode optical fiber comprises a fiber core and a cladding wrapping the fiber core; wherein the content of the first and second substances,
the fiber core comprises a main fiber core and a plurality of air hole auxiliary fiber cores, the main fiber core is positioned in the center of the air hole few-mode optical fiber, and the air hole auxiliary fiber cores are distributed around the main fiber core; the main fiber core comprises an elliptical ring-shaped fiber core and a central fiber core positioned in the center of the elliptical ring-shaped fiber core;
the refractive index of the central fiber core is the same as that of the air hole auxiliary fiber cores; the refractive index of the elliptical ring-shaped fiber core is greater than that of the central fiber core; the refractive index of the cladding is greater than the refractive index of the central core, and the refractive index of the cladding is less than the refractive index of the elliptical ring-shaped core.
2. The air-hole few-mode fiber supporting 14-mode low-crosstalk and easy-MIMO processing according to claim 1, wherein the number of the air-hole auxiliary cores is four; the first air hole auxiliary fiber core and the second air hole auxiliary fiber core are symmetrically distributed above and below the main fiber core; the third air hole auxiliary fiber core and the fourth air hole auxiliary fiber core are symmetrically distributed on the left side and the right side of the main fiber core.
3. The low crosstalk and easy MIMO processing air hole few mode fiber supporting 14 modes according to claim 2, wherein ellipticity of the major axis to the minor axis of the inner and outer ellipses of the elliptical ring core is 1.18 and 1.75, respectively; the distance between the first air hole auxiliary fiber core and the second air hole auxiliary fiber core and the elliptical ring-shaped fiber core is 1 mu m; the distance between the third air hole auxiliary fiber core and the distance between the fourth air hole auxiliary fiber core and the elliptical ring-shaped fiber core are both 0.3 mu m.
4. The air hole few-mode fiber supporting 14-mode low crosstalk and easy MIMO processing according to claim 1, wherein the diameters of the air hole auxiliary cores are the same and are all 5 μm to 15 μm;
the diameter of the cladding is between 62.5 μm and 125 μm.
5. The low crosstalk and easy MIMO processing air-hole few mode optical fiber supporting 14 modes according to claim 1, wherein the refractive index of said central core and said plurality of air-hole auxiliary cores is 1.
6. The air hole few-mode fiber supporting 14-mode low crosstalk and easy MIMO processing according to claim 5, wherein the refractive index of the elliptical ring core is 1.478.
7. The low crosstalk and easy MIMO processing air hole few mode fiber supporting 14 modes according to claim 6, wherein the material of the elliptical ring core is germanium dioxide doped silica glass.
8. The low crosstalk and easy MIMO processing air hole few mode optical fiber of claim 7 supporting 14 modes wherein the germanium dioxide doped silica glass has a germanium dioxide doping concentration of 23%.
9. The low crosstalk and MIMO-treatable air-hole-less-mode optical fiber according to any one of claims 6-8, wherein the cladding has a refractive index of 1.444.
10. The low crosstalk and easy MIMO processing air hole few mode fiber supporting 14 modes according to claim 9, wherein the material of the cladding is silica glass.
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040258379A1 (en) * | 2003-06-19 | 2004-12-23 | Berkey George E. | Single polarization optical fiber and system and method for producing same |
| CN106886071A (en) * | 2017-03-23 | 2017-06-23 | 华中科技大学 | What a kind of eigen mode was kept completely separate moves back degeneracy multimode fibre |
-
2021
- 2021-08-24 CN CN202110977321.7A patent/CN113777697A/en not_active Withdrawn
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040258379A1 (en) * | 2003-06-19 | 2004-12-23 | Berkey George E. | Single polarization optical fiber and system and method for producing same |
| CN106886071A (en) * | 2017-03-23 | 2017-06-23 | 华中科技大学 | What a kind of eigen mode was kept completely separate moves back degeneracy multimode fibre |
Non-Patent Citations (3)
| Title |
|---|
| HAISU LI 等: "Polarization-Maintaining Few-Mode Optical Fibers with Air-Hole Structures", 《ASIA COMMUNICATIONS AND PHOTONICS CONFERENCE》, pages 1 - 3 * |
| HAN XIAO 等: "Hole-assisted polarization-maintaining few-mode fiber", 《OPTICS AND LASER TECHNOLOGY》, pages 162 - 168 * |
| 肖涵: "新型偏振保持少模光纤与太赫兹偏振保持波导的研究", 《中国博士学位论文全文数据库-基础学科辑》, pages 005 - 20 * |
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Application publication date: 20211210 |