CN108702209A - OAM Deplexing methods and device based on interference isolation technics - Google Patents
OAM Deplexing methods and device based on interference isolation technics Download PDFInfo
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- CN108702209A CN108702209A CN201880000719.1A CN201880000719A CN108702209A CN 108702209 A CN108702209 A CN 108702209A CN 201880000719 A CN201880000719 A CN 201880000719A CN 108702209 A CN108702209 A CN 108702209A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
- H04B10/112—Line-of-sight transmission over an extended range
- H04B10/1129—Arrangements for outdoor wireless networking of information
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Abstract
The present invention provides a kind of OAM Deplexing apparatus and method based on interference isolation technics.The device is divided into two parts, and first part is OAM interference separators, and second part is composite phase hologram;OAM interferes separator to include two Dove prisms, two plane mirrors and two optical beam-splitters, is put according to rectangle position according to aplanatic mode, and the relative angle of two Dove prism placement locations keeps 90 ° of difference;SLM2 and SLM3 is equipped at output port A and B, composite phase hologram is separately positioned on SLM2 and SLM3.Compared with traditional single Deplexing method, this method is more efficient, can demultiplex multichannel OAM channels simultaneously.Compared with Dammam vortex grating, this method has very big significance to the vortex beams controllability higher of each order of diffraction for OAM communication systems.
Description
Technical field
The present invention relates to OAM de-multiplexing techniques, more particularly to the OAM detection techniques based on interference isolation technics.
Background technology
According to Maxwell equation, electromagnetic radiation is loaded with energy and momentum simultaneously, and momentum includes linear momentum and angular momentum.
Wherein angular momentum can be divided into two parts:Spin angular momentaum (Spin Angular Momentum, SAM) and orbital angular momentum
(Orbital Angular Momentum, OAM), SAM is related to the circular polarization characteristics of electromagnetic field, the phase of OAM and electromagnetic field
Structure is related, and on the whole, the SAM and OAM of electromagnetic field can be mutually converted, not with ambient systems angular momentum exchange
Under conditions of, total conservation of angular momentum can be maintained.In recent years, it with the development of the communication technology, wirelessly communicates also towards high band
Wide, high-speed direction is developed.How frequency spectrum resource is reasonably utilized, improves the availability of frequency spectrum and code efficiency, become current
One research hotspot of wireless domain.Since L.Allen proves the electromagnetic wave of the exp (- il θ) phase factor carried with electricity
Magnetic orbital angular momentum (OAM), wherein l represent OAM states, and we term it topological charges.Due to being phase between theoretically difference OAM states
It is mutually orthogonal, so it is desirable to the OAM states of electromagnetic wave can be applied well in the field of communications in recent years, becomes and carry
The basis of high traffic rate and code efficiency has obtained extensive research in academia.
Currently, the de-multiplexing technique of OAM states is very single, mainly vortex beams are turned by the method for antiphase plate
Change Gaussian beam into, and this method can bring many unnecessary energy losses.People are by designing optical diffraction member thus
Part come realize OAM Channels demultiplex, have also been proposed Dammam fork like grating thus.Dammam type fork like grating is same so far
When the best device of demultiplexing effect.But this grating requires strictly the selection of OAM states, and immutable, different OAM
The vortex beams of state are unable to Arbitrary distribution, and controllability is poor.Therefore the application proposes a kind of based on interference separation and high effective optical
Diffraction element in conjunction with mode realize efficient OAM demultiplexing.
Invention content
The present invention is detached by the way that the vortex light of compound OAM states is carried out odd even OAM states by Dove prism, then by compound
Phase hologram carry out demodulation detection.This method avoids being inserted into different retardation plates or uses multiple cascade interferometers
By single-screw light beam or two Coaxial Superimposeds are concerned with and incoherent spiral light beam is detached according to the odevity of OAM states, then
It is demodulated by designed high efficiency composition phase hologram, to realize the efficient demultiplexing of OAM channels.
In order to solve the problems, such as that in the prior art, the present invention provides a kind of OAM based on interference isolation technics to demultiplex dress
It sets, which is divided into two parts, and first part is OAM interference separators, and second part is composite phase hologram;OAM
Interfere separator include two Dove prisms, two plane mirrors and two optical beam-splitters, according to aplanatic mode according to
Rectangle position is put, and the relative angle of two Dove prism placement locations keeps 90 ° of difference;It is equipped at output port A and B
SLM2 and SLM3, composite phase hologram are separately positioned on SLM2 and SLM3.
As a further improvement on the present invention, the composite phase hologram is imitative by spatial light modulator and MATLAB
True Software for Design.
As a further improvement on the present invention, the SLM is the spatial light modulator of a 1280X1280 pixel, update
Frequency is 20us.
As a further improvement on the present invention, the optical beam-splitter is the beam splitter of a single side phase change, from admittedly
The phase change of π can be realized by determining direction incidence.
As a further improvement on the present invention, further include CCD optical cameras, be respectively set for collecting at SLM2 and SLM3
Picture.
Based on the OAM Deplexing methods of interference isolation technics, the device described in above-mentioned any one, specific steps are utilized
It is as follows:
(1) after the vortex laser of a branch of compound OAM states enters Deplexing apparatus, interfere firstly for OAM odd evens and detach
Part puts two Dove prisms, two plane mirrors and two single side beam splitters according to aplanatic mode according to rectangle position
It puts, the relative angle that two Dove prism positions are placed will keep 90 ° of difference;
(2) it is detached by odd even and then different port is detected;According to the odd number part in the OAM states of substrate,
The demodulation composite phase hologram of port A is designed to, for detecting odd number OAM states;According to the even number portion in the OAM states of substrate
Point, the demodulation composite phase hologram of port B is designed to, for detecting even number OAM states;
(3) after transmission after a period of time, the odd even separating end of the system is reached, two-way light is formd by beam splitter
Beam, finally on output port A and B, what the ports A exported is the combined vortex light beam of odd number OAM states, and output port B's is even
The combined vortex light beam of the compound vortex beams of number OAM states, the output of two ports is incident on SLM2 and SLM3 respectively, by solution
After multiplexing, the vortex beams that different OAM states are had in the different orders of diffraction are converted into Gauss bright spot, realize demultiplexing for OAM channels
With.
As a further improvement on the present invention, further include following steps:Changed by updating the phase hologram of SLM1
The combined vortex light beam of transmission changes the information of transmission, then passes through above system successively, until all pictures on a pictures
Element value end of transmission.
The beneficial effects of the invention are as follows:
The present invention utilizes the interference pattern of vortex beams, the characteristics of interfering cancellation by the Phase Stacking of phase difference of pi, passes through
Power and influence mirror rotates phase, reuses beam splitter and is overlapped and can detach odd even OAM states.It is compound after separation
Vortex beams are realized in the distribution that can observe bright spot in each order of diffraction by designed composite phase hologram
The demultiplexing of more efficient compound OAM channels.Compared with traditional antiphase plate Deplexing method, this method is more efficient, damage
The energy smaller of mistake.There is very big significance for OAM communication systems.
Description of the drawings
Fig. 1 is the efficient OAM demultiplexer systems frame diagram based on interference isolation technics;
Fig. 2 is the obtained combined vortex light beam of no-go end mouth after being detached by odd even;
Fig. 3 is that the combined vortex light beam of different port passes through the demultiplexing plot of light intensity of high efficiency composition phase hologram;
In Fig. 1:BS:Optical beam-splitter;DP:Dove prism;M:Plane mirror;L:Lens;CCD:Optical camera;d:Distance;
SLM:Spatial light modulator.
Specific implementation mode
The present invention will be further described below in conjunction with the accompanying drawings.
The present invention is to interfere isolation technics based on traditional vortex beams, is designed according to practical application.According to whirlpool
Orthogonality between optically-active Shu Butong OAM states can establish a set of OAM Deplexing apparatus based on interference isolation technics.Such as Fig. 1
It is shown:The device is divided into two parts, first part be by two Dove prisms (DP1 and DP2) and optical beam-splitter (BS1 and
BS2) OAM formed interferes separator, and second part is by set by spatial light modulator (SLM) and MATLAB simulation softwares
The composite phase hologram of meter carries out the judgement of OAM states by being diffracted into different positions to the bright spot of the order of diffraction.
Based on the OAM Deplexing methods of interference isolation technics, it is as follows:
(1) after the vortex laser of a branch of compound OAM states enters Deplexing apparatus, interfere firstly for OAM odd evens and detach
Part, by two Dove prisms, two plane mirrors (M1 and M2) and two single side beam splitter (BS:Beam Splitters) according to
Aplanatic mode is put according to rectangle position, it should be noted that two Dove prisms will differ 90 ° respectively, the relative angle that position is placed
Degree will keep 90 ° of difference, such as the placement position of the DP1 and DP2 of Fig. 1, to realize the rotation of vortex phase.
(2) it is detached by odd even and then different port is detected.According to the odd number part in the OAM states of substrate,
It is designed to the demodulation composite phase hologram of port A, is specifically used to detection odd number OAM states;According to the even number in the OAM states of substrate
Part is designed to the demodulation composite phase hologram of port B, is specifically used to detection even number OAM states.
(3) after transmission after a period of time, the odd even separating end of the system is reached, two-way light is formd by beam splitter
Beam, finally on output port A and B, what the ports A exported is all the combined vortex light beam of odd number OAM states, and the output of the ports B is
The compound vortex beams of even number OAM states.The combined vortex light beam of two ports output is incident on SLM2 and SLM3 respectively, is passed through
After demultiplexing, the vortex beams that different OAM states are had in the different orders of diffraction are converted into Gauss bright spot, realize the solution of OAM channels
Multiplexing.
SLM is the spatial light modulator of a 1280X1280 pixel, renewal frequency 20us.
Vortex laser is He-Ne Lasers, wavelength 1550nm, waist radius 3.5mm, transmission range 1m.
Optical beam-splitter is the beam splitter of a single side phase change, and the phase change of π can be realized from fixed-direction incidence.
Phase hologram is passed through designed by MATLAB simulation softwares according to iterative algorithm.MATLAB is to use both at home and abroad
Numerical simulation calculating instrument, the phase hologram produced, which is input in spatial light modulator (slm), can realize light
The manipulation of field phase.
Embodiment 1:
With reference to embodiment, the present invention is further described.
(1) vortex beams { -4, -3, -2, -1 ,+1 ,+2 ,+3 ,+4 } for choosing one group of difference OAM state are used as substrate, according to
Odd even is classified, and { -3, -1 ,+1 ,+3 } and { -4, -2 ,+2 ,+4 } can be divided into.It is generated according to the topological charge at the two subbase bottoms flat
The phase hologram of equal Energy distribution, and be fixed to respectively in SLM2 and SLM3 and be used as Deplexing apparatus;
(2) assume to transmit a kind of gray-scale map, convert each gray value of image to binary system, every eight information bits correspond to
One group of topological charge, such as 01101000 correspond to { -3, -2 ,+1 }, be input in designed iterative algorithm be used for generating it is compound
Hologram, and be input in SLM1 and be used as coding side;
(3) in transmitting terminal, the Gaussian beam of a branch of He-Ne laser transmitting is incident on SLM1 and will generate with multiple
The combined vortex light beam of OAM states, and carry corresponding information and be transmitted in free space;
(4) after transmission after a period of time, receiving terminal is reached.Compound vortex beams initially enter OAM interference separation
Device, in port, A exports the compound vortex beams of odd number topological charge, such as the combined vortex light beam of { -3 ,+1 }, and in port, B is defeated
Go out { -2 };
(5) change the information of transmission by updating the phase hologram of SLM1 to change the combined vortex light beam of transmission,
Pass through above system successively again, until all pixels value end of transmission on a pictures.
The above content is a further detailed description of the present invention in conjunction with specific preferred embodiments, and it cannot be said that
The specific implementation of the present invention is confined to these explanations.For those of ordinary skill in the art to which the present invention belongs, exist
Under the premise of not departing from present inventive concept, a number of simple deductions or replacements can also be made, all shall be regarded as belonging to the present invention's
Protection domain.
Claims (7)
1. a kind of OAM Deplexing apparatus based on interference isolation technics, it is characterised in that:The device is divided into two parts, and first
Part is OAM interference separators, and second part is composite phase hologram;OAM interferes separator to include two road power and influences
Mirror, two plane mirrors and two optical beam-splitters, put according to aplanatic mode according to rectangle position, and two Dove prisms are put
The relative angle of seated position keeps 90 ° of difference;SLM2 and SLM3, composite phase hologram difference are equipped at output port A and B
It is arranged on SLM2 and SLM3.
2. the OAM Deplexing apparatus according to claim 1 based on interference isolation technics, it is characterised in that:It is described compound
Phase hologram is by spatial light modulator and MATLAB Simulation Software Designs.
3. the OAM Deplexing apparatus according to claim 1 based on interference isolation technics, it is characterised in that:The SLM is
The spatial light modulator of one 1280X1280 pixel, renewal frequency 20us.
4. the OAM Deplexing apparatus according to claim 1 based on interference isolation technics, it is characterised in that:The optics
Beam splitter is the beam splitter of a single side phase change, and the phase change of π can be realized from fixed-direction incidence.
5. the OAM Deplexing apparatus according to claim 1 based on interference isolation technics, it is characterised in that:Further include CCD
Optical camera is respectively set for collecting the picture at SLM2 and SLM3.
6. the OAM Deplexing methods based on interference isolation technics, it is characterised in that:It utilizes claim 1 to 5 any one institute
The device stated,
It is as follows:
(1) after the vortex laser of a branch of compound OAM states enters Deplexing apparatus, interfere separate section firstly for OAM odd evens,
Two Dove prisms, two plane mirrors and two single side beam splitters are put according to aplanatic mode according to rectangle position, two
The relative angle that a Dove prism position is placed will keep 90 ° of difference;
(2) it is detached by odd even and then different port is detected;According to the odd number part in the OAM states of substrate, design
At the demodulation composite phase hologram of port A, for detecting odd number OAM states;According to the even segments in the OAM states of substrate, if
The demodulation composite phase hologram for counting into port B, for detecting even number OAM states;
(3) after transmission after a period of time, the odd even separating end of the system is reached, two-way light beam is formd by beam splitter,
Finally on output port A and B, what the ports A exported is the combined vortex light beam of odd number OAM states, and output port B's is even number
The combined vortex light beam of the compound vortex beams of OAM states, the output of two ports is incident on SLM2 and SLM3 respectively, by demultiplexing
With rear, the vortex beams that different OAM states are had in the different orders of diffraction are converted into Gauss bright spot, realize the demultiplexing of OAM channels.
7. the OAM Deplexing methods according to claim 6 based on interference isolation technics, it is characterised in that:Further include as
Lower step:Change the information of transmission by updating the phase hologram of SLM1 to change the combined vortex light beam of transmission, then according to
It is secondary to pass through above system, until all pixels value end of transmission on a pictures.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/CN2018/085719 WO2019210522A1 (en) | 2018-05-04 | 2018-05-04 | Oam demultiplexing method and apparatus based on interference isolation technology |
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| CN108702209A true CN108702209A (en) | 2018-10-23 |
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| CN201880000719.1A Pending CN108702209A (en) | 2018-05-04 | 2018-05-04 | OAM Deplexing methods and device based on interference isolation technics |
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| WO (1) | WO2019210522A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020093183A1 (en) * | 2018-11-05 | 2020-05-14 | 东莞理工学院 | Oam mode demodulation system based on mode conversion |
| CN114785422A (en) * | 2022-04-15 | 2022-07-22 | 西安理工大学 | System for transmitting radial polarization vortex light beam interference underwater |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113405675A (en) * | 2021-05-06 | 2021-09-17 | 杭州电子科技大学 | Incoherent superposition keying method and system based on orbital angular momentum state of light beam |
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| CN101587281A (en) * | 2009-06-18 | 2009-11-25 | 北京理工大学 | Realize the method and apparatus of demodulation of mixing auger phase light beam orbit angular momentum state |
| CN105388635A (en) * | 2015-10-16 | 2016-03-09 | 南京邮电大学 | Non-damage separating method and separating subsystems of random multiplex rail angular momentum states |
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| US9615068B2 (en) * | 2014-01-15 | 2017-04-04 | Disney Enterprises, Inc. | Optical vortex 3D displays |
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- 2018-05-04 WO PCT/CN2018/085719 patent/WO2019210522A1/en active Application Filing
Patent Citations (5)
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| CN101251655A (en) * | 2008-03-21 | 2008-08-27 | 北京理工大学 | Apparatus for implementing orbit angular momentum state super position and modulation |
| CN101587281A (en) * | 2009-06-18 | 2009-11-25 | 北京理工大学 | Realize the method and apparatus of demodulation of mixing auger phase light beam orbit angular momentum state |
| CN105388635A (en) * | 2015-10-16 | 2016-03-09 | 南京邮电大学 | Non-damage separating method and separating subsystems of random multiplex rail angular momentum states |
| CN106301595A (en) * | 2016-08-26 | 2017-01-04 | 中国科学技术大学 | A kind of OAM |photon state | separator |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2020093183A1 (en) * | 2018-11-05 | 2020-05-14 | 东莞理工学院 | Oam mode demodulation system based on mode conversion |
| CN114785422A (en) * | 2022-04-15 | 2022-07-22 | 西安理工大学 | System for transmitting radial polarization vortex light beam interference underwater |
| CN114785422B (en) * | 2022-04-15 | 2024-01-19 | 西安理工大学 | System for radial polarized vortex beam interference is transmitted under water |
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| WO2019210522A1 (en) | 2019-11-07 |
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Application publication date: 20181023 |