CN114200572A - Vortex light non-zero dispersion displacement optical fiber - Google Patents
Vortex light non-zero dispersion displacement optical fiber Download PDFInfo
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- CN114200572A CN114200572A CN202010977893.0A CN202010977893A CN114200572A CN 114200572 A CN114200572 A CN 114200572A CN 202010977893 A CN202010977893 A CN 202010977893A CN 114200572 A CN114200572 A CN 114200572A
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- 239000006185 dispersion Substances 0.000 title claims abstract description 61
- 239000013307 optical fiber Substances 0.000 title claims abstract description 46
- 238000006073 displacement reaction Methods 0.000 title abstract description 9
- 239000000835 fiber Substances 0.000 claims abstract description 36
- 238000005253 cladding Methods 0.000 claims abstract description 23
- 239000000463 material Substances 0.000 claims abstract description 18
- 230000003287 optical effect Effects 0.000 claims abstract description 11
- 238000004891 communication Methods 0.000 claims abstract description 6
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 48
- 239000000377 silicon dioxide Substances 0.000 claims description 24
- 235000012239 silicon dioxide Nutrition 0.000 claims description 9
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 229910000577 Silicon-germanium Inorganic materials 0.000 claims 1
- 230000009022 nonlinear effect Effects 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 2
- 238000012545 processing Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract 1
- 230000005540 biological transmission Effects 0.000 description 6
- 230000001629 suppression Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
- 230000000717 retained effect Effects 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
- G02B6/02214—Optical fibres with cladding with or without a coating tailored to obtain the desired dispersion, e.g. dispersion shifted, dispersion flattened
- G02B6/02219—Characterised by the wavelength dispersion properties in the silica low loss window around 1550 nm, i.e. S, C, L and U bands from 1460-1675 nm
- G02B6/02266—Positive dispersion fibres at 1550 nm
- G02B6/02271—Non-zero dispersion shifted fibres, i.e. having a small positive dispersion at 1550 nm, e.g. ITU-T G.655 dispersion between 1.0 to 10 ps/nm.km for avoiding nonlinear effects
-
- 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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- Chemical & Material Sciences (AREA)
- Dispersion Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Glass Compositions (AREA)
Abstract
The invention relates to a vortex light non-zero dispersion displacement optical fiber, which is applied to the technical fields of optical fiber communication, optical signal processing and the like. The nonlinear effect severely limits the application of the wavelength division multiplexing technology, and the invention provides an optical fiber technical scheme which can be used for reserving a proper amount of dispersion to inhibit four-wave mixing: the optical fiber has a cladding comprising a high refractive index annular ring, vortex light is confined in the annular region to propagate, and the refractive index contrast and hence the dispersion properties of the optical fiber can be changed by changing the materials of the annular region and the cladding, the cross-sectional structure being constant along the length of the optical fiber. The invention has the beneficial effects that: the optical fiber has a proper amount of chromatic dispersion at a 1550nm optical fiber communication window, and the adjustment of the chromatic dispersion and the chromatic dispersion change slope can be realized by properly adjusting the position of a circular ring, the width of the circular ring and the optical fiber material. The fiber dispersion condition can be made to conform to ITU-T G.655 standard by properly increasing the core cladding refractive index contrast and adjusting the ring region position and ring width.
Description
Technical Field
The invention relates to a vortex light non-zero dispersion displacement optical fiber, in particular to a ring optical fiber with low dispersion and four-wave mixing suppression characteristics. The method is applied to the technical fields of optical fiber communication, optical signal processing and the like.
Background
The vortex rotation has unique field distribution, a phase singularity exists in the center of the vortex rotation, the light intensity at the singularity is zero, the light wave phase is spirally distributed in the direction perpendicular to the propagation direction, and the vortex rotation has orbital angular momentum. The vortex rotation is divided into polarized vortex rotation and phase vortex rotation, and the polarized vortex rotation is composed of radial vector light beamsTM 01 Sum angular vector beamTE 01 Two modes, phase vortex rotation also known as Orbital Angular Momentum (OAM) vortex rotation, the OAM mode can be expressed as OAM l,m Whereinl (l =1, ± 2, ± 3 …) is the topological charge,mis the radial order corresponding to the intensity distribution of the mode in the radial direction. OAM modes for transmission in an optical fiber may consist of the vector eigenmodes by the following relationship:
OAM vortex rotation induced by a topological charge number of 1
And
two modes are linearly combined
. Vortex rotation can be used as a carrier for transmitting optical information, which is different from phase and polarization, and the vortex rotation provides new dimension for information transmission and expands new channels.
When light is transmitted in an optical fiber, the nonlinear effect of the optical fiber is a big obstacle for limiting the transmission quality of the optical fiber, and in a wavelength division multiplexing system, new wavelengths generated by four-wave mixing affect the signal-to-noise ratio and generate crosstalk between channels. To minimize nonlinear effect losses and improve fiber performance, it is necessary to use a non-zero dispersion shifted fiber that retains some dispersion at 1550nm, and the appropriate amount of dispersion retained in the 1550nm window reduces the four-wave mixing effect by increasing phase mismatch. Currently, there is no non-zero dispersion shifted fiber design suitable for vortex rotation.
Disclosure of Invention
In view of the above, the present invention provides a vortex optical non-zero dispersion shifted fiber with low dispersion, and aims to provide a feasible optical fiber structure for suppressing four-wave mixing for vortex optical transmission.
The technical scheme adopted by the invention is specifically as follows:
the vortex light non-zero dispersion displacement optical fiber with low dispersion comprises a fiber core and a fiber cladding which is sleeved outside the fiber core, wherein the fiber cladding comprises an annular region and an outer fiber cladding. The annular region is arranged between the fiber core and the outer fiber cladding; wherein: refractive index n of the fiber core, the annular region and the fiber cladding outside the ring1、n2、n3Satisfy n1、n3Is less than n2The value of (1), i.e., the concentric annular regions have a higher index of refraction than the other regions; the optical fiber material can be a combination of materials such as silicon dioxide, germanium-doped silicon dioxide, fluorine-doped silicon dioxide and the like under the condition of meeting the refractive index distribution.
In this configuration, the modes are confined to travel within the annular region based on the annular region having a higher index of refraction than the cladding region, thereby providing a larger effective mode area to reduce nonlinear effects. Under certain refractive index contrast and structural parameters, the waveguide dispersion characteristic and the material dispersion characteristic of the optical fiber can provide lower dispersion for the OAM mode so as to realize the suppression of four-wave mixing.
The invention has the beneficial effects that: by selecting materials of the annular region and the core cladding and properly adjusting the width of the ring or the position of the annular region, the adjustment of the dispersion change slope of the OAM mode in a 1550nm communication window and a C waveband (1530 nm-1565 nm) can be realized. The numerical calculation result shows that the OAM mode dispersion characteristic of the vortex optical nonzero dispersion displacement optical fiber with low dispersion can be in accordance with the ITU-T G.655.C standard by properly adjusting the conditions.
Drawings
FIG. 1 is a schematic cross-sectional structure of an optical fiber of the present invention.
FIG. 2 shows the optical fiber structure of the present invention, in which r is doped at a concentration of 0.09mol% and silica is used as the core1=5.5 μm，r2=7 μm、r1=19.5 μm，r2=21 μm、r1=47.5 μm，r2Parameter of =50 μm corresponds toOAM 1,1 The positive dispersion of a mode varies with wavelength.
FIG. 3 shows the optical fiber structure of the present invention, in which r is doped with 0.035mol% and air is used as the core1=21.5 μm，r2=25.4 μm、r1=21.5 μm，r2=25.6 μm、r1=21.5 μm，r2Parameter of 25.8 μm corresponds toOAM 1,1 The positive dispersion of a mode varies with wavelength.
FIG. 4 shows the results of the optical fiber structure of the present invention, when doped with 0.09mol% and silica is used as the core1=13.5 μm，r2=17 μm、r1=13.5 μm，r2=17.1 μm、r1=13.5 μm，r2Parameter of =17.2 μm corresponds toOAM 1,1 The negative dispersion of a mode varies with wavelength.
FIG. 5 shows the difference r between the optical fiber structure of the present invention doped with silica at a concentration of 0.09mol% as the core1，r2Correspond toOAM 1,1 The dispersion value of the mode at 1550 nm.
FIG. 6 shows the difference r between the optical fiber structure of the present invention doped with silica at a concentration of 0.09mol% in the core1，r2Correspond toOAM 1,1 The dispersion change value of the mode in the C-band (1530 nm-1565 nm).
FIG. 7 shows the difference r between the optical fiber structure of the present invention doped with 0.035mol% and air as the core1，r2Correspond toOAM 1,1 The dispersion value of the mode at 1550 nm.
FIG. 8 shows the difference r between the optical fiber structure of the present invention doped with 0.035mol% and air as the core1，r2Correspond toOAM 1,1 Mode in C band(1530 nm to 1565 nm).
In the figure: 1. a fiber core; 2. an annular region; 3. an outer fiber cladding;
r1a core radius; r is2The annular region radius; r is3The outer fiber cladding radius; Δ r. annular region width.
Detailed Description
The following further describes embodiments of the present invention with reference to the accompanying drawings:
example 1:
the vortex light non-zero dispersion displacement optical fiber with low dispersion of the invention is shown in figure 1, and comprises a fiber core 1, an annular region 2 and an outer fiber cladding 3 from inside to outside, wherein the refractive indexes are n respectively1、n2、n3The annular region 2 is a high-refractive-index annular ring with a refractive index higher than that of other regions, and the refractive index distribution satisfies n1≤ n3<n2The optical fiber material can be silica, germanium-doped silica, fluorine-doped silica and other materials under the condition of meeting the refractive index distribution. In this embodiment, the material of the annular region is silica doped with germanium at a molar concentration of 0.09mol%, the material of the core and the cladding of the core is silica, and the cross-sectional structure is constant along the length direction of the optical fiber.
FIG. 2 is a drawing showing1=5.5 μm，r2=7 μm、r1=19.5 μm，r2=21 μm、r1=47.5 μm，r2Parameter of =50 μm corresponds toOAM 1,1 The positive dispersion of a mode is plotted against wavelength. As can be seen from the figure, by adjusting r1And r2That is, the position of the annular region and the width of the annular region can adjust the dispersion value at 1550nm and the slope of the dispersion change in the C band (1530 nm to 1565 nm).
Different r1，r2Correspond toOAM 1,1 The dispersion value of the mode at 1550nm is shown in figure 5. It can be seen that the vortex light transmitted in the optical fiber of the present invention can achieve lower dispersion at 1550nm, which is sufficient to suppress four-wave mixing.
Different r1，r2Correspond toOAM 1,1 The dispersion change values of the mode in the C-band (1530 nm-1565 nm) are shown in FIG. 6. It can be seen that the dispersion characteristics of the vortex light transmission in the optical fiber of the present invention can satisfy the ITU-T g.655.c standard.
Example 2:
the vortex light non-zero dispersion displacement optical fiber with low dispersion of the invention is shown in figure 1, and comprises a fiber core 1, an annular region 2 and an outer fiber cladding 3 from inside to outside, wherein the refractive indexes are n respectively1、n2、n3The annular region 2 is a high-refractive-index annular ring with a refractive index higher than that of other regions, and the refractive index distribution satisfies n1≤ n3<n2. In this embodiment, the core region is air, the annular region is made of silica doped with germanium at a molar concentration of 0.035mol%, the core cladding is made of silica, and the cross-sectional structure is constant along the length of the optical fiber.
FIG. 3 is a drawing showing1=21.5 μm，r2=25.4 μm、r1=21.5 μm，r2=25.6 μm、r1=21.5 μm，r2Parameter of 25.8 μm corresponds toOAM 1,1 The positive dispersion of a mode is plotted against wavelength. FIG. 4 is a drawing showing1=13.5 μm，r2=17 μm、r1=13.5 μm，r2=17.1 μm、r1=13.5 μm，r2Parameter of =17.2 μm corresponds toOAM 1,1 The negative dispersion of the mode is plotted against wavelength. As can be seen from the figure, by adjusting r1And r2That is, the width of the annular region can adjust the dispersion value at 1550nm and the slope of the dispersion change in the C band (1530 nm-1565 nm).
Different r1，r2Correspond toOAM 1,1 The dispersion value of the mode at 1550nm is shown in figure 7. It can be seen from the figure that the vortex light transmitted in the optical fiber of the present invention can realize lower positive dispersion and negative dispersion at 1550nm, which are sufficient for suppressing four-wave mixing.
Different r1，r2Correspond toOAM 1,1 The dispersion change values of the mode in the C-band (1530 nm-1565 nm) are shown in FIG. 8. It can be seen from the figure thatThe dispersion characteristic of vortex light transmission in the optical fiber can meet the ITU-T G.655.C standard.
The optical fiber material capable of realizing the vortex rotation non-zero dispersion displacement characteristic has many choices and combination modes, so any further extension comprising the optical fiber material also belongs to the protection scope of the invention.
The foregoing detailed description of embodiments of the invention has been presented with reference to the accompanying drawings, which are included to provide a further understanding of the invention. The scope of the invention is not to be limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Therefore, the technical idea of the invention and only obvious changes of the technical scheme are all within the protection scope of the invention.
Claims (6)
1. A vortex light non-zero dispersion shifted optical fiber is characterized in that: the optical fiber core has a concentric annular region with a refractive index higher than that of the cladding.
2. The vortex optical non-zero dispersion shifted fiber of claim 1, wherein: the optical fiber comprises a fiber core and a fiber cladding sleeved outside the fiber core, wherein the fiber cladding comprises a concentric annular region and an outer fiber cladding; a concentric annular region disposed between the core and the outer fiber cladding; refractive index n of fiber core, concentric annular region, and fiber cladding outside the ring1、n2、n3Satisfies the following conditions: n is1≤ n3<n2。
3. The vortex optical non-zero dispersion shifted fiber of claim 1 or 2, wherein: by suitably increasing the width r of the annular region2-r1The dispersion condition at a 1550nm communication window can be adjusted, and the change slope of dispersion in a C-band (1530 nm to 1565 nm) in communication is changed; wherein r is2Is the outer ring radius of the concentric annular region, r1Is the radius of the inner ring of the concentric annular region.
4. A vortex optical dispersion compensating fiber as claimed in claim 3, wherein: the optical fiber material is silicon dioxide or germanium-doped silicon dioxide or fluorine-doped silicon dioxide.
5. A vortex optical dispersion compensating fiber as claimed in claim 4, wherein: the fiber core is filled with air or silica, the material of the annular region is germanium-doped silica, and the material of the fiber core cladding is silica.
6. A vortex optical dispersion compensating fiber as claimed in claim 5, wherein: the material of the annular region is 3.5mol% germanium-doped silicon dioxide or 9mol% germanium-doped silicon dioxide, and the refractive index of the 3.5mol% germanium-doped silicon dioxide material at the wavelength of 1550nm is 1.4493; the 9mol% germanium doped silica material had a refractive index of 1.4575 at a wavelength of 1550 nm.
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| CN202010977893.0A CN114200572B (en) | 2020-09-17 | 2020-09-17 | Vortex light non-zero dispersion displacement optical fiber |
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| CN202010977893.0A CN114200572B (en) | 2020-09-17 | 2020-09-17 | Vortex light non-zero dispersion displacement optical fiber |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062704A (en) * | 2014-06-13 | 2014-09-24 | 中国科学院西安光学精密机械研究所 | Micro-structured optical fiber for generating and transmitting vortex light beams |
| CN107238890A (en) * | 2017-07-05 | 2017-10-10 | 南京邮电大学 | A kind of photonic crystal fiber for transmitting 22 photon angular momentum moulds |
| CN109100827A (en) * | 2018-07-13 | 2018-12-28 | 上海大学 | A kind of optical fiber and preparation method thereof kept for vortex beams transmission |
| WO2020112347A1 (en) * | 2018-11-27 | 2020-06-04 | Corning Incorporated | Quantum key distribution systems having low loss dispersion limiting fibers |
| CN111562649A (en) * | 2020-06-11 | 2020-08-21 | 南开大学 | Vortex light dispersion compensation optical fiber |
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2020
- 2020-09-17 CN CN202010977893.0A patent/CN114200572B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104062704A (en) * | 2014-06-13 | 2014-09-24 | 中国科学院西安光学精密机械研究所 | Micro-structured optical fiber for generating and transmitting vortex light beams |
| CN107238890A (en) * | 2017-07-05 | 2017-10-10 | 南京邮电大学 | A kind of photonic crystal fiber for transmitting 22 photon angular momentum moulds |
| CN109100827A (en) * | 2018-07-13 | 2018-12-28 | 上海大学 | A kind of optical fiber and preparation method thereof kept for vortex beams transmission |
| WO2020112347A1 (en) * | 2018-11-27 | 2020-06-04 | Corning Incorporated | Quantum key distribution systems having low loss dispersion limiting fibers |
| CN111562649A (en) * | 2020-06-11 | 2020-08-21 | 南开大学 | Vortex light dispersion compensation optical fiber |
Non-Patent Citations (2)
| Title |
|---|
| YINGNING WANG等: "Air-Core Ring Fiber With >1000 Radially Fundamental OAM Modes Across O, E, S, C, and L Bands", 《IEEE ACCESS》 * |
| 孙婷婷等: "掺锗微结构光纤的非线性特性研究", 《激光与红外》 * |
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