CN110838886B - Orthogonal linear polarization multimode vortex optical demultiplexing device and method - Google Patents
Orthogonal linear polarization multimode vortex optical demultiplexing device and method Download PDFInfo
- Publication number
- CN110838886B CN110838886B CN201911117226.9A CN201911117226A CN110838886B CN 110838886 B CN110838886 B CN 110838886B CN 201911117226 A CN201911117226 A CN 201911117226A CN 110838886 B CN110838886 B CN 110838886B
- Authority
- CN
- China
- Prior art keywords
- vortex
- light
- linear polarization
- orthogonal
- orthogonal linear
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/06—Polarisation multiplex systems
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/04—Mode multiplex systems
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses an orthogonal linear polarization multi-mode vortex optical demultiplexing device and a method, wherein the device comprises: an orthogonal linearly polarized vortex light generation module for generating orthogonal linearly polarized multimodal vortex rotation; the super-structure surface device module is used for realizing simultaneous demultiplexing on the orthogonal linear polarization multi-mode vortex light; and the remote image point detection module is used for detecting the light field distribution after passing through the super-structure surface device module. The invention can realize the simultaneous demodulation of the orthogonal linear polarization multi-mode vortex light, has the characteristics of small device volume, simple and convenient implementation process, and is suitable for a mixed multi-orbital angular momentum vortex optical rotation real-time demodulation module which needs the orthogonal polarization in a high-speed communication system.
Description
Technical Field
The invention relates to the technical field of optical communication, in particular to an orthogonal linear polarization multi-mode vortex optical demultiplexing device and method, which are mainly applied to the field of OAM (Orbital Angular Momentum) multiplexing optical communication.
Background
As an important means for increasing the communication capacity of optical communication, multiplexing techniques are increasingly gaining attention, and common multiplexing techniques include: optical time division multiplexing, polarization division multiplexing, wavelength division multiplexing, and the like. However, the existing dimensional resource development of these technologies has almost reached a limit, and with the rapid development of information technology, optical communication faces a new capacity crisis. An Orbital Angular Momentum (OAM) beam is a structured beam with a spatially helical phase whose helical phase distribution can be described by a phase function exp (il θ), each photon carrying an orbital angular momentum of lh, where l is the topological charge of the vortex rotation, θ is the azimuth angle, and η is the planck constant divided by 2 π. Each photon of the OAM beam may theoretically carry both Spin Angular Momentum (SAM) and Orbital Angular Momentum (OAM), which affect the polarization and spatial distribution of the vortex light, respectively. Theoretically, the topological charge l of the OAM light beam can take any integer value, and the modes of different OAM light beams are completely orthogonal, so that the OAM light beam has extra degree of freedom of regulation compared with a common gaussian light beam, and the OAM light beam can be used for multiplexing modulation to improve the communication capacity and the spectral efficiency.
However, in the current OAM communication, the polarization and OAM modes cannot be demultiplexed simultaneously, which greatly reduces the demodulation timeliness of the communication system, and meanwhile, some current demultiplexing devices have the problem of overlarge volume and cannot be applied to an integrated optical circuit. Therefore, there is a need for a device that is small and can simultaneously demodulate multimode eddy currents of orthogonal linear polarization.
In the process of demultiplexing the multiplexed vortex optical rotation, two kinds of demultiplexing devices are mainly used at present, namely a spiral phase plate is used. The demultiplexer can convert vortex light beams with corresponding topological charges into Gaussian points, and further demodulation of information is achieved. However, each spiral phase plate can only fixedly detect a topological charge with a corresponding value, so that one spiral phase plate can only realize demultiplexing of one corresponding OAM channel in the demodulation process of transmitted information, which not only makes the demodulation work cumbersome, but also consumes a lot of time. The second type of spatial light modulator is often considered a better demodulation means. The spatial light modulator can not only demultiplex a single OAM light beam, but also has good demodulation effect on multiplexing vortex optical rotation. By loading the phase distribution of the vortex grating or the Dammann vortex grating, a series of Gaussian image points with topological charge values corresponding to vortex light can be obtained behind the diffraction screen, the Gaussian image points contain corresponding vortex optical rotation loading information, and the information carried on the vortex optical rotation can be restored by analyzing the Gaussian image points of each order obtained by diffraction, so that the real-time demodulation of the multiple vortex optical rotation is realized. Spatial light modulators have significant limitations in the demultiplexing process. Due to its polarization sensitive property, the spatial light modulator responds only to x-polarized waves, and the response result is very poor for polarized waves in the orthogonal direction. Spatial light modulators exhibit good performance in demodulating single polarization direction vortex light, but often do not perform well in demodulating orthogonal vortex light.
Therefore, the prior art still needs to be improved and developed to address the above drawbacks.
Disclosure of Invention
The invention aims to solve the technical problem of providing an orthogonal linear polarization multi-mode vortex photolysis multiplexing device and method, aiming at the defects in the prior art, the orthogonal Dammann vortex grating phase distribution device is designed by utilizing a full-dielectric metamaterial surface material, and corresponding Dammann vortex grating phase distribution is loaded in the X polarization direction and the Y polarization direction of the material surface respectively by cutting the size of a structural unit of the metamaterial surface material, so that polarization and OAM mode demodulation can be carried out on orthogonal linear polarization multiple vortex optical rotations simultaneously.
The technical scheme adopted by the invention for solving the technical problem is as follows:
an orthogonal linearly polarized multi-modal vortex optical demultiplexing device, wherein the orthogonal linearly polarized multi-modal vortex optical demultiplexing device comprises:
an orthogonal linearly polarized vortex light generation module for generating orthogonal linearly polarized multimodal vortex rotation;
the super-structure surface device module is used for realizing simultaneous demultiplexing on the orthogonal linear polarization multi-mode vortex light;
and the remote image point detection module is used for detecting the light field distribution after passing through the super-structure surface device module.
The orthogonal linear polarization multimode vortex optical demultiplexing device, wherein the orthogonal linear polarization light generating module comprises:
a first light source and a second light source for generating a gaussian beam;
the first polarizer and the second polarizer are used for changing the polarization direction of the Gaussian beam;
a first spatial light modulator and a second spatial light modulator for generating multiple orbital angular momentum vortex rotation;
a half-wave plate for changing the polarization direction of the vortex light;
a reflector for changing the direction of the light path;
and the beam combining device is used for combining the light beams.
The orthogonal linear polarization multi-mode vortex optical demultiplexing device is characterized in that the first light source, the first polarizer and the first spatial light modulator are arranged on the same light path;
the second light source, the second polarizer and the second spatial light modulator are arranged on the same optical path;
the half-wave plate is arranged behind the first spatial light modulator, and the beam combining device is arranged behind the half-wave plate;
the reflector is arranged behind the second spatial light modulator, and the beam combining device is arranged above the reflector.
The orthogonal linear polarization multimode vortex photolysis multiplexing device comprises a super-structure surface device module, a polarization module and a polarization module, wherein the super-structure surface device module comprises a super-structure surface of a Gaussian image point for diffraction of orthogonal linear polarization vortex optical rotation;
the superstructure surface is arranged behind the beam combining device.
The orthogonal linear polarization multi-mode vortex optical demultiplexing device is characterized in that the remote image point detection module comprises a shooting device used for detecting the Gaussian image point to obtain information carried by corresponding vortex rotation;
the shooting device is arranged behind the surface of the superstructure.
The orthogonal linear polarization multimode vortex optical demultiplexing device is characterized in that the first light source and the second light source are lasers with the wavelength of 1550 nm;
the first polarizer and the second polarizer are both a Gray prism polarized in the X direction;
the first spatial light modulator and the second spatial light modulator are both transmission type phase spatial light modulators which only respond to the X polarization direction;
the included angle between the fast axis direction of the half-wave plate and the X axis direction is 45 degrees;
the reflector is a plane reflector;
the beam combining device is a polarization beam combiner.
The orthogonal linear polarization multi-mode vortex optical demultiplexing device is characterized in that the super-structure surface is a demultiplexer of which the structural units meet the phase distribution of the Dammann vortex grating in the orthogonal direction.
The orthogonal linear polarization multi-mode vortex optical demultiplexing device is characterized in that the X-direction and Y-direction Dammann vortex grating phase diagrams are loaded on the super-structure surface.
The orthogonal linear polarization multi-mode vortex optical demultiplexing device is characterized in that the shooting device is a 1550nm CCD camera.
The orthogonal linear polarization multi-mode vortex optical demultiplexing method based on the orthogonal linear polarization multi-mode vortex optical demultiplexing device comprises the following steps:
step A, a first light source generates 1550nm laser, the 1550nm laser passes through a first polarizer to form linearly polarized light in the Y-axis direction of the polarization direction, the linearly polarized light is modulated by a first spatial light modulator to generate multimode vortex optical rotation, and the multimode vortex optical rotation is converted into multimode vortex optical rotation in the X direction of the polarization direction through a half-wave plate;
step B, the second light source generates 1550nm laser, the laser passes through the second polarizer to form linearly polarized light with the polarization direction in the Y direction, and the linearly polarized light passes through the second spatial light modulator to generate multi-mode vortex optical rotation with the polarization direction in the Y axis direction;
step C, reflecting the light beams emitted by the second spatial light modulator to a beam combining device through a reflector, and finishing polarization beam combination with the light beams emitted by the half-wave plate on the beam combining device, wherein finally emitted light is multi-mode vortex rotation with polarization states in the X direction and the Y direction;
and D, diffracting the emergent multi-mode vortex optical rotation with orthogonal linear polarization when passing through the super-structure surface, detecting Gaussian image points of topological charges corresponding to different modal vortex light on a shooting device, and analyzing the Gaussian image points to obtain information carried by the corresponding vortex optical rotation so as to realize demodulation of the orthogonal linear polarization multi-mode vortex optical rotation.
Has the advantages that:
(1) the invention can realize the simultaneous demodulation of the orthogonal linear polarization multi-mode vortex light.
(2) The demultiplexing device designed by the invention has the characteristics of small volume, convenient use and the like, and can be applied to a rear-end information receiving module in an optical communication system.
Drawings
Fig. 1 is a schematic structural diagram of a preferred embodiment of the orthogonal linear polarization multimode vortex optical demultiplexing device according to the present invention.
Fig. 2 is a schematic diagram of the specific structure (i.e. the whole optical path structure) of each module of the orthogonal linear polarization multimode vortex optical demultiplexing device according to the preferred embodiment of the present invention.
FIG. 3 is a schematic structural diagram of a process for forming a device with a super-structured surface according to the present invention.
FIG. 4 is a flow chart of a preferred embodiment of the orthogonal linear polarization multi-modal vortex optical demultiplexing method of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer and clearer, the present invention is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of an orthogonal linear polarization multimode vortex optical demultiplexing device according to a preferred embodiment of the present invention.
As shown in fig. 1, an orthogonal linear polarization multimode vortex optical demultiplexing device according to an embodiment of the present invention includes:
an orthogonal linearly polarized vortex light generation module for generating orthogonal linearly polarized multimodal vortex rotation; the super-structure surface device module is used for realizing simultaneous demultiplexing on the orthogonal linear polarization multi-mode vortex light; and the remote image point detection module is used for detecting the light field distribution after passing through the super-structure surface device module.
Specifically, as shown in fig. 2, the orthogonal linearly polarized light generating module includes: a first light source 1 and a second light source 6 for generating a gaussian light beam; a first polarizer 2 and a second polarizer 5 for changing the polarization direction of the Gaussian beam; a first spatial light modulator 3 and a second spatial light modulator 4 for generating multiple orbital angular momentum vortex rotation; a half-wave plate 7 for changing the polarization direction of the vortex light; a mirror 9 for changing the direction of the optical path; beam combining means 8 for combining the light beams.
Wherein the first light source 1, the first polarizer 2 and the first spatial light modulator 3 are disposed on the same optical path; the second light source 6, the second polarizer 5 and the second spatial light modulator 4 are arranged on the same optical path; the half-wave plate 7 is arranged behind the first spatial light modulator 3, and the beam combining device 8 is arranged behind the half-wave plate 7; the reflector 9 is arranged behind the second spatial light modulator 4, and the beam combining device 8 is arranged above the reflector 9.
The super-structure surface device module comprises a super-structure surface 10 of a Gaussian image point for diffraction of orthogonal linear polarization vortex rotation, the super-structure surface is an artificial layered material with the thickness smaller than the wavelength, the super-structure surface can realize flexible and effective regulation and control of characteristics such as electromagnetic wave polarization, amplitude, phase, polarization mode, propagation mode and the like, and the super-structure surface can be regarded as two-dimensional correspondence of the super-structure material; the superstructure surface 10 is arranged behind the beam combining means 8.
The remote image point detection module comprises a shooting device 11 for detecting the Gaussian image point to obtain information carried by the corresponding vortex rotation; the camera 11 is arranged behind the superstructure surface 10.
Further, the first light source 1 and the second light source 6 are both lasers with a wavelength of 1550 nm; the first polarizer 2 and the second polarizer 5 are both a Gray prism polarized in the X direction; the first spatial light modulator 3 and the second spatial light modulator 4 are both transmission type phase spatial light modulators which only respond to the X polarization direction, but are not limited to the transmission type phase spatial light modulators, and can also be replaced by reflection type phase spatial light modulators; the included angle between the fast axis direction of the half-wave plate 7 and the X axis direction is 45 degrees; the reflector 9 is a plane reflector; the beam combining device 8 is a polarization beam combiner.
The super-structure surface 10 is a demultiplexer with structural units meeting the phase distribution of the Dammann vortex grating in the orthogonal direction, wherein the super-structure surface 10 is a full-dielectric super-structure material loaded with corresponding Dammann vortex grating phase diagrams in the X polarization direction and the Y polarization direction respectively; the nanostructured surface 10 is loaded with a Dammann vortex grating phase diagram in the X and Y directions.
The shooting device 11 is a 1550nm CCD camera.
The above-described apparatus is not limited to these devices, and may be replaced with devices having corresponding functions.
In the orthogonal linear polarization vortex light generation module, a laser (a first light source 1) outputs linearly polarized light in the X direction after passing through a Glan prism, the linearly polarized vortex optical rotation (light beam 1) in the X direction is obtained after passing through a spatial light modulator (such as a reflective phase type spatial light modulator), and the fast axis of the half-wave plate forms an included angle of 45 degrees with the horizontal direction after passing through the half-wave plate, so that the incident light is converted into the linearly polarized vortex optical rotation in the Y direction after passing through the half-wave plate; in the same way, the laser (the second light source 6) outputs linearly polarized light in the X direction after passing through the Glan prism, then the linearly polarized light in the X direction passes through the spatial light modulator to obtain linearly polarized vortex optical rotation (the light beam 2) in the X direction, and after passing through the plane mirror, the light beam 1 and the light beam 2 are finally converted into multiplexing vortex optical rotation through the beam combiner.
Referring to fig. 3, fig. 3 is a schematic view of a nanostructured surface device. The phase diagram (12) is a phase distribution of the Dammann grating in the X direction, the phase diagram (13) is a phase distribution diagram of the Dammann grating with the polarization direction being the Y direction, and the phase diagram (12) and the phase diagram (13) are loaded to two orthogonal polarization directions of the super surface respectively for demultiplexing incident multiplexing vortex optical rotation.
Further, based on the orthogonal linear polarization multi-mode vortex optical demultiplexing device provided in the above embodiment, the present invention further provides an orthogonal linear polarization multi-mode vortex optical demultiplexing method, please refer to fig. 4, and fig. 4 is a flowchart of a preferred embodiment of the orthogonal linear polarization multi-mode vortex optical demultiplexing method according to the present invention.
According to the optical path structure of the orthogonal linear polarization multimode vortex optical demultiplexing device, the specific implementation process is as follows:
step S100, a first light source generates 1550nm laser, the 1550nm laser passes through a first polarizer to form linearly polarized light in the Y-axis direction of the polarization direction, the linearly polarized light is modulated by a first spatial light modulator to generate multimode vortex optical rotation, and the multimode vortex optical rotation is converted into multimode vortex optical rotation in the X-axis direction of the polarization direction through a half-wave plate;
step S200, after 1550nm laser is generated by a second light source, linearly polarized light with the polarization direction in the Y direction is formed through a second polarizer, and after the linearly polarized light passes through a second spatial light modulator, multi-mode vortex optical rotation with the polarization direction in the Y-axis direction is generated;
step S300, reflecting the light beams emitted by the second spatial light modulator to a beam combining device through a reflector, and finishing polarization beam combination on the beam combining device together with the light beams emitted by the half-wave plate, wherein finally emitted light is multi-modal vortex optical rotation with polarization states in the X direction and the Y direction;
step S400, the emergent multi-mode vortex optical rotation with orthogonal linear polarization is diffracted when passing through the super-structure surface, Gaussian image points of topological charges corresponding to different modal vortex optical lights are detected on the shooting device, information carried by the corresponding vortex optical rotation is obtained through analysis of the Gaussian image points, and demodulation of the orthogonal linear polarization multi-mode vortex optical rotation is achieved.
The invention uses the difference of the long and short axes of the structural unit of the super surface to the polarization response in the X direction and the Y direction, respectively introduces the designed Dammann phase grating in the two polarization directions of the super surface by cutting the size of the structural unit on the super surface, realizes different functions for the incidence of different polarized light beams, and further realizes the simultaneous demodulation of the orthogonal linear polarized multi-mode vortex optical rotation.
Firstly, a design method of a super-structure surface device based on the Dammann vortex grating is described as follows: the advantage of the transmission phase is utilized here, the phase change of which is mainly caused by the dimensional change of the structural units of the super-surface and the rotation angle of which is constant. The phase distributions loaded to two orthogonal polarization directions of the super-surface are respectively phixAnd phiyIn each super-surface structure unit, the size can be changed to change phixAnd phiy。
The transmission function of the Dammann grating in two orthogonal directions can be expressed as follows: the transmission function of a one-dimensional Dammann vortex grating can be expressed as:
wherein m is a diffraction order, T is a grating period, i is an imaginary number, and theta is a rotation angle of the vortex beam; lxAnd lyTopological charges in the x and y directions, respectively, CmThe correlation coefficient on the m-th diffraction order is expressed as:
wherein xNWhen the boundary value x00 and xNNormalized phase discontinuities at 1, N is the total number of these discontinuities.
The phases of the super-surface structure unit in the X and Y polarization directions are respectively taken as phix＝angle(Tx)、φy＝angle(Ty) The phase distribution of the Dammann vortex grating in the orthogonal direction can be realized by cutting the size of the super-surface structure unit, so that the simultaneous demultiplexing of orthogonal linear polarization multi-mode vortex optical rotation is realized.
The OAM demultiplexing device based on the super surface can simultaneously realize the combined demultiplexing of polarization and OAM modes. The specific implementation process comprises the following steps: firstly, when Gaussian light is incident to a super surface, due to the interaction of incident light in different polarization states and Dammann vortex gratings in different directions of the super surface, OAM arrays in the X direction and the Y direction are generated in a far field, wherein the topological charges of the OAM arrays in the X direction are respectively +2, +1, 0, -1 and-2 from left to right, and the topological charges of the OAM arrays in the Y direction are respectively +2, +1, 0, -1 and-2 from bottom to top. Here, the OAM arrays in the X direction are all in the X linear polarization state, and the OAM arrays in the Y direction are all in the Y linear polarization state. For demultiplexing the OAM light beam, firstly when the OAM light beam with a topological charge value l is incident on the super surface, different polarization states will be demodulated to different directions, for example, when the incident OAM light beam is an X polarized wave, it will be projected to the horizontal direction of the far field, which realizes the demultiplexing of the polarization. For demultiplexing of the OAM mode, due to the interaction of an incident beam and a phase grating, a Gaussian point is restored at a position where the far-field topological load is-l, and information extraction is further realized. Through the analysis, when the incident light beams are multiplexing OAM light beams with different topological charge values and orthogonal polarization, different polarization states can be demodulated to different directions, and different OAM modes can be demodulated to different positions in corresponding directions, so that the combined demultiplexing of the polarization and the OAM modes is realized.
The method can realize simultaneous demodulation on the multi-mode orthogonal linear polarization vortex light, and is expected to fill the gap of the multi-mode vortex light demultiplexing and multiplexing method.
In summary, the present invention provides an orthogonal linear polarization multimode vortex optical demultiplexing device and method, where the device includes: an orthogonal linearly polarized vortex light generation module for generating orthogonal linearly polarized multimodal vortex rotation; the super-structure surface device module is used for realizing simultaneous demultiplexing on the orthogonal linear polarization multi-mode vortex light; and the remote image point detection module is used for detecting the light field distribution after passing through the super-structure surface device module. The invention can realize the simultaneous demodulation of the orthogonal linear polarization multi-mode vortex light, has the characteristics of small device volume, simple and convenient implementation process, and is suitable for a mixed multi-orbital angular momentum vortex optical rotation real-time demodulation module which needs the orthogonal polarization in a high-speed communication system.
It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.
Claims (6)
1. An orthogonal linear polarization multi-mode vortex optical demultiplexing device, comprising:
an orthogonal linearly polarized vortex light generation module for generating orthogonal linearly polarized multimodal vortex rotation;
the orthogonal linearly polarized vortex light generating module includes:
a first light source and a second light source for generating a gaussian beam;
the first polarizer and the second polarizer are used for changing the polarization direction of the Gaussian beam;
a first spatial light modulator and a second spatial light modulator for generating multiple orbital angular momentum vortex rotation;
a half-wave plate for changing the polarization direction of the vortex light;
a reflector for changing the direction of the light path;
beam combining means for combining the beams;
the first light source, the first polarizer and the first spatial light modulator are arranged on the same optical path;
the second light source, the second polarizer and the second spatial light modulator are arranged on the same optical path;
the half-wave plate is arranged behind the first spatial light modulator, and the beam combining device is arranged behind the half-wave plate;
the reflector is arranged behind the second spatial light modulator, and the beam combining device is arranged above the reflector;
the super-structure surface device module is used for realizing simultaneous demultiplexing on the orthogonal linear polarization multi-mode vortex light;
the super-structure surface device module comprises a super-structure surface of a Gaussian image point for diffraction of orthogonal linear polarization vortex rotation; the super-structure surface is arranged behind the beam combining device;
the remote image point detection module is used for detecting the light field distribution after passing through the super-structure surface device module;
the remote image point detection module comprises a shooting device for detecting the Gaussian image point to obtain information carried by the corresponding vortex rotation; the shooting device is arranged behind the surface of the superstructure; information carried by corresponding vortex rotation is obtained through the analysis of the Gaussian image points, and the demodulation of orthogonal linear polarization multi-mode vortex rotation is realized.
2. The orthogonal linear polarization multi-modal vortex photolysis device according to claim 1, wherein the first light source and the second light source are both lasers with a wavelength of 1550 nm;
the first polarizer and the second polarizer are both a Gray prism polarized in the X direction;
the first spatial light modulator and the second spatial light modulator are both transmission type phase spatial light modulators which only respond to the X polarization direction;
the included angle between the fast axis direction of the half-wave plate and the X axis direction is 45 degrees;
the reflector is a plane reflector;
the beam combining device is a polarization beam combiner.
3. The orthogonal linear polarization multi-modal vortex optical demultiplexing device according to claim 1, wherein the meta-structured surface is a demultiplexer whose structural units satisfy the phase distribution of the Dammann vortex grating in the orthogonal direction.
4. The orthogonal linear polarization multi-modal vortex optical demultiplexing device according to claim 3, wherein said meta-surface is loaded with Dammann vortex grating phase diagrams in X-direction and Y-direction.
5. The orthogonal linear polarization multi-modal vortex optical demultiplexing device according to claim 1, wherein said capturing device is a 1550nm CCD camera.
6. An orthogonal linear polarization multi-mode vortex optical demultiplexing method based on the orthogonal linear polarization multi-mode vortex optical demultiplexing device according to any one of claims 1 to 5, wherein the orthogonal linear polarization multi-mode vortex optical demultiplexing method comprises the following steps:
step A, a first light source generates 1550nm laser, the 1550nm laser passes through a first polarizer to form linearly polarized light in the Y-axis direction of the polarization direction, the linearly polarized light is modulated by a first spatial light modulator to generate multimode vortex optical rotation, and the multimode vortex optical rotation is converted into multimode vortex optical rotation in the X direction of the polarization direction through a half-wave plate;
step B, the second light source generates 1550nm laser, the laser passes through the second polarizer to form linearly polarized light with the polarization direction in the Y direction, and the linearly polarized light passes through the second spatial light modulator to generate multi-mode vortex optical rotation with the polarization direction in the Y axis direction;
step C, reflecting the light beams emitted by the second spatial light modulator to a beam combining device through a reflector, and finishing polarization beam combination with the light beams emitted by the half-wave plate on the beam combining device, wherein finally emitted light is multi-mode vortex rotation with polarization states in the X direction and the Y direction;
and D, diffracting the emergent multi-mode vortex optical rotation with orthogonal linear polarization when passing through the super-structure surface, detecting Gaussian image points of topological charges corresponding to different modal vortex light on a shooting device, and analyzing the Gaussian image points to obtain information carried by the corresponding vortex optical rotation so as to realize demodulation of the orthogonal linear polarization multi-mode vortex optical rotation.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911117226.9A CN110838886B (en) | 2019-11-15 | 2019-11-15 | Orthogonal linear polarization multimode vortex optical demultiplexing device and method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911117226.9A CN110838886B (en) | 2019-11-15 | 2019-11-15 | Orthogonal linear polarization multimode vortex optical demultiplexing device and method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110838886A CN110838886A (en) | 2020-02-25 |
| CN110838886B true CN110838886B (en) | 2021-03-23 |
Family
ID=69575045
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911117226.9A Active CN110838886B (en) | 2019-11-15 | 2019-11-15 | Orthogonal linear polarization multimode vortex optical demultiplexing device and method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110838886B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022225664A1 (en) * | 2021-04-21 | 2022-10-27 | X Development Llc | Cascaded integrated photonic wavelength demultiplexer |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114791667A (en) * | 2022-04-12 | 2022-07-26 | 北京理工大学 | Light beam differential operation method based on Dammann vortex metasurface |
| CN115333909B (en) * | 2022-07-11 | 2023-09-19 | 西安交通大学 | Multi-channel multi-beam system and multiplexing method based on OAM orthogonal mode multiplexing |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136289A (en) * | 2015-09-08 | 2015-12-09 | 北京理工大学 | Composite grating used for detecting multiplexing vortex light beams and measuring method |
| CN110120837A (en) * | 2019-04-08 | 2019-08-13 | 深圳大学 | A kind of device and method promoting vortex light spatial multiplexing communication system stability |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4495774B1 (en) * | 2009-07-01 | 2010-07-07 | 北陽電機株式会社 | Optical data transmission equipment |
| CN108333687B (en) * | 2018-01-12 | 2019-11-05 | 中山大学 | A kind of multiplexer demultiplexer based on orbital angular momentum light |
-
2019
- 2019-11-15 CN CN201911117226.9A patent/CN110838886B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105136289A (en) * | 2015-09-08 | 2015-12-09 | 北京理工大学 | Composite grating used for detecting multiplexing vortex light beams and measuring method |
| CN110120837A (en) * | 2019-04-08 | 2019-08-13 | 深圳大学 | A kind of device and method promoting vortex light spatial multiplexing communication system stability |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022225664A1 (en) * | 2021-04-21 | 2022-10-27 | X Development Llc | Cascaded integrated photonic wavelength demultiplexer |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110838886A (en) | 2020-02-25 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110838886B (en) | Orthogonal linear polarization multimode vortex optical demultiplexing device and method | |
| Li et al. | Full-space cloud of random points with a scrambling metasurface | |
| Chen et al. | Generation and characterization of a perfect vortex beam with a large topological charge through a digital micromirror device | |
| Liu et al. | Tuning the focus of a plasmonic lens by the incident angle | |
| US20200173844A1 (en) | Method and system for measuring orbital angular momentum modes of photons based on spiral transformation | |
| Drezet et al. | Surface plasmon propagation in an elliptical corral | |
| Ren et al. | Dynamic generation of Ince-Gaussian modes with a digital micromirror device | |
| Lu et al. | Phase detection of coherence singularities and determination of the topological charge of a partially coherent vortex beam | |
| Tobias et al. | Light intensity enhancement by diffracting structures in solar cells | |
| Liu et al. | Invited Article: Nano-kirigami metasurfaces by focused-ion-beam induced close-loop transformation | |
| Ohlinger et al. | Spatially addressable design of gradient index structures through spatial light modulator based holographic lithography | |
| US20230081415A1 (en) | Ultra-compact multilayer metasurface imaging system integrating lenses and spaces | |
| Peters et al. | The effect of photonic structures on the light guiding efficiency of fluorescent concentrators | |
| CN106788703B (en) | The OAM detection device of OV light beam | |
| Liu et al. | Compact acoustic monolayered metadecoder for efficient and flexible orbital angular momentum demultiplexing | |
| Huang et al. | Polarization-selective waveguide holography in the visible spectrum | |
| KR102056063B1 (en) | In-line scanning holography apparatus | |
| Yi et al. | Recent research progress in optical super-resolution planar meta-lenses | |
| CN112558203B (en) | Independent phase control device and method for radial and angular column vector beams | |
| CN111007671A (en) | Device and method for generating radial high-order perfect vortex light beam | |
| WO2019210522A1 (en) | Oam demultiplexing method and apparatus based on interference isolation technology | |
| Khan et al. | Detection of partially coherent polarization singular vector beams using Stokes polarimetry | |
| Jin et al. | Wavelength-dependent three-dimensional volumetric optical vortices modulation based on metasurface | |
| Vega et al. | Pinhole quantum ghost imaging | |
| CN112147789B (en) | OAM demultiplexing device and method based on coordinate transformation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |