CN112711099A - Multi-layer cascade diffraction vortex light beam multiplexing and demultiplexing device - Google Patents
Multi-layer cascade diffraction vortex light beam multiplexing and demultiplexing device Download PDFInfo
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- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/2804—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals forming multipart couplers without wavelength selective elements, e.g. "T" couplers, star couplers
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- G—PHYSICS
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- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2766—Manipulating the plane of polarisation from one input polarisation to another output polarisation, e.g. polarisation rotators, linear to circular polarisation converters
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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
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/27—Optical coupling means with polarisation selective and adjusting means
- G02B6/2753—Optical coupling means with polarisation selective and adjusting means characterised by their function or use, i.e. of the complete device
- G02B6/2773—Polarisation splitting or combining
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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
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Abstract
The invention belongs to the technical field of optical communication, and particularly relates to a multilayer cascade diffraction vortex light beam multiplexing and demultiplexing device which comprises a single-mode optical fiber array, a multiplexing and demultiplexing system and a vortex optical fiber which are sequentially connected, wherein the multiplexing and demultiplexing system comprises a plurality of phase plates which are optimally adjusted by a gradient descent method to obtain different phases. The invention optimizes and adjusts the phase distribution of the middle phase plate of the multiplexing and demultiplexing system by a gradient descent method, maximizes the matching degree of the output of the multiplexing and demultiplexing system and a single-mode fiber array or a vortex fiber, and realizes maximized coupling efficiency; in addition, the application of the single-mode fiber array enables the device to support multiplexing and demultiplexing of a plurality of vortex modes, and high-efficiency and multi-mode quantity of vortex light beam multiplexing and demultiplexing are achieved.
Description
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a multi-layer cascade diffraction vortex light beam multiplexing and demultiplexing device.
Background
With the development of wavelength division multiplexing, amplitude modulation, polarization multiplexing and other technologies, the channel capacity of the conventional optical fiber communication technology gradually tends to a bottleneck. With the rise of various new technologies such as big data, cloud computing, unmanned driving and the like, the capacity demand for optical communication is continuously increased. In order to solve the contradiction between the communication capacity demand in the future and the trend bottleneck of the prior art, the development of a new optical communication technology is urgently needed. One of the most promising schemes currently used for solving the problem is to use light for spatial multiplexing, which can be independent of conventional techniques such as wavelength division multiplexing and amplitude modulation, and can increase the communication capacity by a corresponding multiple of the number of spatial channels, thus having great potential. One subset of space division multiplexing is mode division multiplexing, which exploits the orthogonality of different modes, where one of the most important orthogonal mode bases of mode division multiplexing is the orbital angular momentum mode. A beam, which typically has a helical phase wavefront factor exp (il θ), where l is the topological charge and θ is the azimuth angle in a cylindrical coordinate system, can be used as the orbital angular momentum mode substrate, also called vortex beam.
The orbital angular momentum light beam or the vortex light beam is one of research hotspots in the optical field, and has a great potential in improving the optical communication capacity, so that the light beam or the vortex light beam is widely concerned by researchers. However, there still exist some difficulties in realizing large-capacity communication of vortex beams, and one of the difficulties is to develop a corresponding multiplexing and demultiplexing device.
The simplest demultiplexing means can be implemented by a beam splitter, but this approach will become less and less energy efficient as the number of optical paths increases and the overall system will become very cumbersome. The method based on the Dammann vortex grating can greatly reduce the complexity of the system, and by corresponding Gaussian beams in different directions with vortex beams with different topological charges, the method can realize the multiplexing or demultiplexing process of the vortex beams through a single device. However, this method has a problem that the energy use efficiency is too low as the number of optical paths increases. In addition, a method based on coordinate transformation may provide a new basis for integrated low-loss vortex light beam multiplexing and demultiplexing, and the energy efficiency based on the method will not change with the change of the vortex light path number, but the method has a problem that the gaussian light beam cannot be directly converted into a composite vortex light beam or the reverse process is performed.
In addition, chinese patent CN108696776A discloses a spatial light multiplexing demultiplexer, which includes a light beam shaping unit, a phase modulator, a half-transmitting and half-reflecting mirror, and a reflecting mirror, where an input signal light source array enters or exits through the light beam shaping unit, and the phase modulator performs orbital angular momentum modulation on multiple optical signals, or analyzes multiple light source signals in a multiplexed signal one by one; when the number of the multiplexed and demultiplexed signals is increased, only the beam shaping unit corresponding to the path of signals needs to be added, and the beam shaping units are arranged in parallel with the original input signals at equal intervals. However, the above solutions all have the problems of narrow band, high loss, high crosstalk and small number of modes.
Disclosure of Invention
The invention provides a multi-layer cascade diffraction vortex light beam multiplexing and demultiplexing device for overcoming at least one defect in the prior art, which is optimized by combining with deep learning so as to realize the multiplexing and demultiplexing of vortex light beams with wide wave bands, low loss, low crosstalk and multi-mode quantity.
In order to solve the technical problems, the invention adopts the technical scheme that:
the device comprises a single-mode fiber array, a multiplexing and demultiplexing system and a vortex fiber which are sequentially connected, wherein the multiplexing and demultiplexing system comprises a plurality of phase plates with different phases.
According to the invention, the phase distribution of the phase plates in the multiplexing and demultiplexing system is optimized and adjusted, so that the matching degree of the output of the multiplexing and demultiplexing system and a single-mode fiber array or a vortex fiber is maximized, and the maximized coupling efficiency is realized; in addition, the application of the single-mode fiber array enables the device to support multiplexing and demultiplexing of a plurality of vortex modes, and high-efficiency and multi-mode quantity of vortex light beam multiplexing and demultiplexing are achieved.
Preferably, the phase slices with different phase distributions are obtained by optimally adjusting through a gradient descent method, wherein the phase adjustment amount is as follows:
wherein, Δ p is phase change, k is coefficient factor, p is phase distribution, and f is matching degree of the light beam after multi-layer diffraction of the phase plate, and is a known function of p. Therefore, the method can achieve higher convergence speed and better convergence effect and obtain better local optimal solution.
Preferably, while the phase of the phase plate is optimally adjusted, a plurality of discrete wavelengths in 1530nm to 1625nm are taken at set intervals for adjustment, so that the multiplexing and demultiplexing system can work in a wide band; in addition, in order to ensure the simplicity of optimization calculation and better optimization effect, the discrete wavelength of the tow rod in the continuous wave band is taken at set intervals for optimization, and specifically, the set intervals can be nm; the obtained result is then discretized, and in particular, order discretization can be adopted to obtain nearly continuous values, so that the processing of the phase plate is more convenient.
Preferably, the optical fiber multiplexing system further comprises a collimation coupling system arranged between the single-mode optical fiber array and the multiplexing and demultiplexing system, and the collimation coupling system comprises a plurality of micro lenses corresponding to the single-mode optical fiber array.
Preferably, the optical fiber bundle-expanding device further comprises a beam-reducing and beam-expanding system, and the beam-reducing and beam-expanding system is arranged between the multiplexing and demultiplexing system and the vortex optical fiber.
Preferably, the above-mentioned beam reduction and expansion system comprises two lenses with different focal lengths, wherein the focal length of the lens close to the multiplexing and demultiplexing system is a multiple of the focal length of the lens far from the multiplexing and demultiplexing system. Because the mode field size in the vortex optical fiber is small, and the mode field size of the vortex light beam multiplexed by the free space is large, the multiplexed vortex light beam needs to be constrained to be matched with a corresponding mode in the vortex optical fiber.
Preferably, the plurality of phase plates are obtained by etching glass, and the etching depth of the plurality of phase plates is determined by the phase adjustment amount. Thus, the phase plate has no energy loss under the condition of ideal total reflection, and the low loss is realized; in addition, the glass is etched at different depths to correspond to different regulation and control phases.
Preferably, the multiplexing and demultiplexing system further comprises a mirror, and the plurality of phase plates are disposed on one side of the mirror. This allows the length of the device to be reduced in size, making it more compact.
Preferably, the single-mode fiber arrays are topologically and symmetrically distributed and are opposite numbers to each other. Thus, by using the symmetry of the light field, the optimization calculation amount can be reduced accordingly.
Compared with the prior art, the beneficial effects are:
the invention optimizes and adjusts the phase distribution of the middle phase plate of the multiplexing and demultiplexing system by a gradient descent method, maximizes the matching degree of the output of the multiplexing and demultiplexing system and a single-mode fiber array or a vortex fiber, and realizes maximized coupling efficiency; in addition, the application of the single-mode fiber array enables the device to support multiplexing and demultiplexing of a plurality of vortex modes, and high-efficiency and multi-mode quantity of vortex light beam multiplexing and demultiplexing are realized; meanwhile, the wavelength of the phase plate is adjusted to 1530-1625 nm, so that the phase plate can be applied to a wide band with the wavelength of 1530-1625 nm with the minimum transmission attenuation loss.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a multilayer cascade diffraction vortex light beam multiplexing and demultiplexing device according to a first embodiment of the present invention;
FIG. 2 is a schematic diagram of a single-mode fiber array arrangement of a multilayer cascade diffraction vortex beam multiplexing/demultiplexing device according to a first embodiment of the present invention;
FIG. 3 is a schematic optical field diagram of a vortex optical fiber of the multilayer cascade diffraction vortex light beam multiplexing and demultiplexing device according to the first embodiment of the present invention;
FIG. 4 is a schematic diagram of the phase distribution of the first phase plate of the multilayer cascade diffraction vortex beam multiplexing and demultiplexing device according to the first embodiment of the present invention;
FIG. 5 is a schematic diagram of the phase distribution of the second phase plate of the multilayer cascade diffraction vortex beam multiplexing and demultiplexing device according to the first embodiment of the present invention;
FIG. 6 is a schematic diagram of the phase distribution of the third phase plate of the multilayer cascade diffraction vortex beam multiplexing and demultiplexing device according to the first embodiment of the present invention;
FIG. 7 is a schematic diagram of the phase distribution of a fourth phase plate of the multilayer cascade diffraction vortex beam multiplexing and demultiplexing device according to the first embodiment of the present invention;
FIG. 8 is a schematic diagram of the phase distribution of a fifth phase plate of the multilayer cascade diffraction vortex beam multiplexing and demultiplexing device according to the first embodiment of the present invention;
fig. 9 is a schematic overall structure diagram of a multilayer cascade diffraction vortex beam multiplexing and demultiplexing device according to a second embodiment of the present invention.
Detailed Description
The drawings are for illustration purposes only and are not to be construed as limiting the invention; for the purpose of better illustrating the embodiments, certain features of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationships depicted in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
Example 1:
as shown in fig. 1 to 8, the multilayer cascade diffraction vortex light beam multiplexing and demultiplexing device includes a single-mode fiber array 1, a multiplexing and demultiplexing system 2, and a vortex fiber 5, which are connected in sequence, where the multiplexing and demultiplexing system 2 includes a phase plate 21, where the phase plate 21 includes a first phase plate 211, a second phase plate 212, a third phase plate 213, a fourth phase plate 214, and a fifth phase plate 215, which are arranged in sequence, the first phase plate is close to the single-mode fiber array 1, and the phase distributions of the five phase plates 21 are different.
Of course, in the present embodiment, the implementation mode that five phase plates 21 are used as a reference only is not understood as a limitation to the present solution, and factors such as the degree of freedom of regulation and control, the complexity of the system, and the propagation and dissipation of light are comprehensively considered, so that the system performance is optimized; generally, the phase plates 21 with more number enable more degree of freedom of regulation and control, and the multiplexing and demultiplexing effect is achieved, but the system complexity and the propagation dissipation of light are increased, and the multiplexing and demultiplexing effect is weakened through counteraction; thus a system may typically employ 3 to 10 phase plates 21.
In the present embodiment, the phase plates 21 with different phase distributions are obtained by performing optimal adjustment through a gradient descent method, where the calculation formula of the phase adjustment amount is:
where Δ p is the phase change, k is the coefficient factor, p is the phase distribution, and f is the matching degree of the light beam after multi-layer diffraction by the phase plate 21, which is a known function of p. Therefore, the method can achieve higher convergence speed and better convergence effect and obtain better local optimal solution. K is used to avoid the parameter adjustment step being too large, and is generally 1/1000, although different values may be used as required in the specific implementation process.
In this embodiment, while the phase of the phase plate 21 is optimally adjusted, a plurality of discrete wavelengths in 1530nm to 1625nm are adjusted at a set interval, so that the multiplexing and demultiplexing system 2 can work in a wide band, wherein 1530nm to 1625nm cover the C band and the L band in the communication optical fiber, and the transmission attenuation loss of the C band and the L band in transmission is minimum, thereby further reducing the multiplexing and demultiplexing loss; in addition, in order to ensure the simplicity of optimization calculation and better optimization effect, the discrete wavelength of the tow rod in the continuous wave band is taken at set intervals for optimization, and specifically, the set intervals can be 5 nm; the obtained result is then discretized, and in particular, 64 steps of discretization may be used to obtain a nearly continuous value, which facilitates the processing of the phase plate 21, and 64 steps of discretization is only a reference embodiment, which is not to be understood as a limitation of the present solution, and of course 16 steps or other discretizations may be used to further optimize the result.
The phase distribution of each phase plate after adjustment is shown in fig. 4 to 8.
In this embodiment, the optical fiber multiplexing system further includes a collimating coupling system 3 disposed between the single-mode fiber array 1 and the multiplexing/demultiplexing system 2, and the collimating coupling system 3 includes a plurality of microlenses 31 corresponding to the single-mode fiber array 1 in number and position.
In the embodiment, the plurality of phase plates 21 are obtained by etching glass, the etching depths of the plurality of phase plates 21 are different, and the etching depths are determined by phase adjustment quantity. Thus, the phase plate 21 has no energy loss under the ideal total reflection condition, and realizes low loss; in addition, the glass is etched at different depths to correspond to different regulation and control phases.
The demultiplexing system 2 in this embodiment further includes a mirror 22, and a plurality of phase plates 21 are disposed on one side of the mirror 22. Thus, the phase plate 21 works under the reflection condition, the length size of the device can be reduced, and the whole device structure is more compact.
As shown in fig. 2 and fig. 3, the single-mode fiber array 1 in the present embodiment adopts a two-dimensional array of 8 × 2, which can correspond to 16 vortex patterns, and the topological charges of the two rows are symmetrically distributed and are opposite numbers to each other. Thus, by using the symmetry of the light field, the optimization calculation amount can be reduced accordingly. It should be noted that the arrangement of the single-mode fiber array 1 in this embodiment is only one reference embodiment, and it should not be understood as a limitation to this embodiment, and in a specific process, it is of course possible to implement multiplexing of 16 vortex modes by using 16x1,4x4 or other non-matrix arrangement, or to implement multiple vortex modes by using other numbers of single-mode fibers.
In specific implementation, the collimating coupling system 3 collimates and couples the gaussian light beam incident from the single-mode fiber array 1, and transmits the collimated and coupled gaussian light beam to the multiplexing and demultiplexing system 2, and the light beam is transmitted through the phase plate 21 and the reflecting mirror 22 in the multiplexing and demultiplexing system 2 and is output by the vortex fiber 5, so that the vortex light beam multiplexing is realized; the reversibility of the optical path can be easily obtained, the vortex light beam incident from the vortex optical fiber 5 is demultiplexed by the multiplexing and demultiplexing system 2, and then the Gaussian light beam is emitted through the single-mode optical fiber array 1.
Example 2:
fig. 9 shows a second embodiment of a multi-layer cascade diffraction vortex light beam multiplexing and demultiplexing device, which is different from the first embodiment only in that the present embodiment further includes a beam reducing and expanding system 4, and the beam reducing and expanding system 4 is disposed between the multiplexing and demultiplexing system 2 and the vortex optical fiber 5.
The beam-shrinking and expanding system 4 in this embodiment includes a first lens 41 and a second lens 42 with different focal lengths, and the focal length ratio of the first lens 41 to the second lens 42 is 20:1, where the first lens is close to the demultiplexing/multiplexing system 2, and the second lens 42 is far from the demultiplexing/multiplexing system 2. Since the mode field size in the vortex fiber 5 is small, and the mode field size of the vortex beam multiplexed by the free space is large, the multiplexed vortex beam needs to be constrained to match the corresponding mode in the vortex fiber 5. It should be noted that the beam shrinking and expanding system 4 including two lenses with different focal lengths is only a reference implementation, and certainly, the beam shrinking and expanding system 4 may also include only one lens, and the functions of the present solution can be implemented by corresponding to the collimating and coupling system 3; in addition, the focal length of the first lens 41 is 20 times the focal length of the second lens 42, which is only a reference embodiment, and is not to be understood as a limitation of the present embodiment, in order to narrow the beam to match the vortex fiber, the focal lengths of the first lens 41 and the second lens 42 may be adjusted proportionally according to the requirement in the specific implementation.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. The multi-layer cascade diffraction vortex light beam multiplexing and demultiplexing device is characterized by comprising a single-mode optical fiber array (1), a multiplexing and demultiplexing system (2) and a vortex optical fiber (5) which are sequentially connected, wherein the multiplexing and demultiplexing system (2) comprises a plurality of phase plates (21) which are distributed in different phases.
2. The multilayer cascade diffraction vortex light beam multiplexing and demultiplexing device according to claim 1, wherein the phase slices (21) with different phase distributions are obtained by optimized adjustment through a gradient descent method, wherein the phase adjustment amount is as follows:
wherein, Δ p is phase change, k is coefficient factor, p is phase distribution, and f is matching degree of the light beam after multi-layer diffraction by the phase plate (21).
3. The multiplexing and demultiplexing device for multi-layered cascaded diffracted vortex beams according to claim 2, wherein the phase of the phase plate (21) is adjusted optimally, and at the same time, discrete wavelengths in the range of 1530nm to 1625nm are adjusted at set intervals.
4. The device according to claim 3, wherein the result of the optimization adjustment is discretized.
5. The multi-layer cascaded diffraction vortex light beam multiplexing and demultiplexing device according to claim 4, further comprising a collimating coupling system (3) disposed between the single-mode fiber array (1) and the multiplexing and demultiplexing system (2), wherein the collimating coupling system (3) comprises a plurality of microlenses (31) corresponding to the single-mode fiber array (1).
6. The multi-layer cascade diffraction vortex light beam multiplexing and demultiplexing device according to claim 5, further comprising a beam reducing and expanding system (4), wherein the beam reducing and expanding system (4) is disposed between the multiplexing and demultiplexing system (2) and the vortex optical fiber (5).
7. The multi-layer cascade diffraction vortex light beam multiplexing and demultiplexing device according to claim 6, wherein the beam-reducing and expanding system (4) comprises two lenses with different focal lengths, wherein the focal length of the lens close to the multiplexing and demultiplexing system (2) is a multiple of the focal length of the lens far from the multiplexing and demultiplexing system (2).
8. The multiplexing and demultiplexing device according to any of claims 2 to 7, wherein the plurality of phase plates (21) are etched from glass, and the etching depth of the plurality of phase plates (21) is determined by said phase adjustment amount.
9. The multi-layer cascaded diffractive vortex beam demultiplexing device according to claim 8, wherein said demultiplexing system (2) further comprises a mirror (22), and a plurality of phase plates (21) are disposed on one side of said mirror (22).
10. The device according to claim 9, wherein the single-mode fiber arrays (1) are distributed symmetrically and opposite in number.
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| CN113376736A (en) * | 2021-06-18 | 2021-09-10 | 天津工业大学 | Vortex integrated multiplexing/demultiplexing optical fiber suitable for 6G communication |
| CN113946059A (en) * | 2021-11-09 | 2022-01-18 | 中国科学院光电技术研究所 | Vortex light beam generation and multiplexing and demultiplexing device based on coherent aperture array |
| CN114791667A (en) * | 2022-04-12 | 2022-07-26 | 北京理工大学 | Light beam differential operation method based on Dammann vortex metasurface |
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| CN111722320A (en) * | 2019-03-22 | 2020-09-29 | 华为技术有限公司 | Mode division multiplexer, mode division multiplexing system, demultiplexing system and communication system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113376736A (en) * | 2021-06-18 | 2021-09-10 | 天津工业大学 | Vortex integrated multiplexing/demultiplexing optical fiber suitable for 6G communication |
| CN113376736B (en) * | 2021-06-18 | 2022-09-02 | 天津工业大学 | Vortex integrated multiplexing/demultiplexing optical fiber suitable for 6G communication |
| CN113946059A (en) * | 2021-11-09 | 2022-01-18 | 中国科学院光电技术研究所 | Vortex light beam generation and multiplexing and demultiplexing device based on coherent aperture array |
| CN113946059B (en) * | 2021-11-09 | 2023-06-30 | 中国科学院光电技术研究所 | Vortex light beam generating, multiplexing and demultiplexing device based on coherent aperture array |
| CN114791667A (en) * | 2022-04-12 | 2022-07-26 | 北京理工大学 | Light beam differential operation method based on Dammann vortex metasurface |
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