CN106569329B - The method and apparatus of one mode and spatial light exchange - Google Patents
The method and apparatus of one mode and spatial light exchange Download PDFInfo
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Abstract
The invention discloses the method and apparatus that one mode and spatial light exchange, this method input multichannel light field corresponds to the exchange of implementation pattern light, spatial light exchange and mode and space by the map function of mode exchange, space exchange, mode and space transfer function and exchanges with the time.The device includes the input module and output module of N number of port, and the optical switch module with N number of mode and spatial light crosspoint.Each mode and spatial light crosspoint individually carry out map function, a port output of corresponding output module to a port of each input module respectively.The present invention is suitable for arranging in different spatial and the multichannel light field with same or different light field mode, can with free space, list, less, multimode fibre, multi-core optical fiber, optical communication system is fully compliant constructed by the orbital angular momentums optical fiber such as few/multimode-multi-core optical fiber, high refractive index optical fibre ring/air core fibre/photonic crystal fiber, there is compatibility.
Description
Technical field
The invention belongs to optic communication and information optical field, it is related to the method and apparatus that one mode and spatial light exchange.
Background technique
Under economic globalization and the background of global IT application accelerated development, Internet service oneself be increasingly becoming modern service
The important component part of industry, and become the important impetus amount of world economy and social development.Cloud service is as next-generation interconnection
The prevailing model for netting service, the various resource mobilizations in network are got up, and provide the efficient clothes of personalized low cost for user
Business, becomes the important trend of Future Internet, will also become the core of modern service industry.Cloud service is making network more next
More roles that play distributed computer interface, network bandwidth and data-handling capacity needed for this type application are pole
Big.According to current development speed, the capacity of whole network will at least promote 100 times at following 10 years, and the same period is conventional single
The promotion of mode fiber capacity of communication system will fall behind network flow speedup an order of magnitude.Therefore, how sustainable improve is led to
Power system capacity is believed, to cope with ever-increasing capacity requirement, it has also become optic communication critical issue urgently to be resolved.All light
It is all the dimension resource expansion for surrounding light wave that the communication technology, which is traced to its source, and the basic dimensions resource of light wave includes amplitude, phase, frequency
Rate/wavelength, polarization, time and transverse spatial distribution.The various multiplexing technologies of promotion message capacity and advanced advanced modulation technology
Exactly making full use of to the amplitude of light wave, phase, frequency/wavelength, polarization and time dimension resource, but with light known to these
Wave dimension resource is developed totally, and optic communication starts to show " new size crisis ".In order to further increase the appearance of optical communication system
Amount, space division multiplexing technology (Space-Division Multiplexing, SDM) at home and abroad attract wide attention.Spatial division multiplexing
The Spatial Dimension that photon is utilized with technology including the mode division multiplexing technology based on multimode fibre or less fundamental mode optical fibre and is based on multi-core optical
Fine core divides multiplexing technology.Mode division multiplexing technology refers to using different orthogonal intersection space modes as different transmission channels, thus
Realize the technology of spatial reuse.Core point multiplexing refers to the multiplexing between spatially different location fibre core, energy between different fibre cores
Very little is coupled, can guarantee stable transmission.It is similar that great successful wavelength-division multiplex (different wave length is obtained in optic communication development process
Value multiplicity and orthogonal) technology, space division multiplexing technology also can mention effectively as the multi-channel Technology in the completely new optical fiber of one kind
The message capacity of high optic communication.
Meanwhile bigger data volume means more information exchanges, therefore, it is novel big that also there is an urgent need to research and developments
Capacity, high-reliability, low-power consumption, the optical switched technology flexibly opened.In wavelength-division multiplex system, wavelength selection is opened the light extensively
Information exchange is realized in general application, but in SDM system, the switch of similar effect is seldom.Therefore, in spatial division multiplexing
With in system, implementation pattern selection opens the light with spatial choice and is necessary.
Summary of the invention
The method and apparatus that the present invention provides one mode and spatial light exchange, it is therefore intended that real in SDM system
Existing information exchange, target are to construct and realize high-reliability, low-power consumption, flexibly open mode and spatial light exchange, to expand
SDM system application range is opened up and improved, the capacity of communication system is further increased by space division multiplexing technology.
The method of one mode and spatial light exchange provided by the invention, which is characterized in that input multichannel light field is located at not
Isospace position, with identical or different light field mode, by mode and spatial light transfer function map function it
Afterwards, output multi-channel light field；When only implementation pattern exchanges transmission function, the output multi-channel light field is relative to input multichannel light field
The exchange of light field mode only occurs, spatial position exchange does not occur；When transmission function only realizes space exchange, the output multi-channel
Relative to input multichannel light field the exchange of light field mode does not occur for light field, and spatial position exchange only occurs；When transmission function while reality
When existing mode and space exchange, relative to input multichannel light field the exchange of light field mode and sky can occur simultaneously for output multi-channel light field
Between place-exchange.
As an improvement of the above technical solution, the input multichannel light field exchanges by spatial light and then passes through respectively
Deflection is corrected in the map function of the transmission function of wavefront correction, passes output multi-channel light field and original input multichannel light field
It is parallel to broadcast direction, output multi-channel light field and input multichannel light field keeping parallelism can be realized the mode and spatial light exchange method tool
Have can cascade, i.e., the multichannel light field exported in parallel can continue to the input multichannel light exchanged as next stage mode and spatial light
?.
The light field mode can be different light beams or mode in free space, optical fiber and other transmission mediums, including
Gaussian beam (Gauss), orbital angular momentum light beam (OAM), vortex beams, Laguerre-Gaussian beam (LG), strategic point in free space
Rice-Gaussian beam (HG), bessel beam (Bessel), vector beam (Vector) and other spatial extent/phase/polarization tune
Eigen mode (Eigenmodes), linear polarization mode (LP) and orbital angular momentum mode (OAM) in light beam and optical fiber processed.
The device of one mode and spatial light exchange provided by the invention, which is characterized in that the device includes input module,
Optical switch module and output module；Wherein, input module and output module have N-port, and N is positive integer, indicate input module
Possessed port number；Optical switch module has N number of smooth crosspoint, and each smooth crosspoint is respectively to the one of each input module
A port is individually converted, a port output of corresponding output module；Light crosspoint includes mode light crosspoint, sky
Between any one of light crosspoint, mode and spatial light crosspoint or appoint several；The mode light crosspoint is to coming from
Light field patterns of change only occurs for the light field of input port, not the exchange between originating port；The spatial light crosspoint is to next
Light field mode conversion does not occur from the light field of input port, the exchange between different port only occurs；The mode and spatial light
To the light field from input port light field mode conversion not only occurs for crosspoint, and the exchange between different port also occurs.
As an improvement of the above technical solution, wavefront correction mould is provided between the optical switch module and output module
Block, for the light field after spatial light crosspoint will to be made parallel with the original direction of propagation of input port light field, into
Enter subsequent output port；Wavefront correction module includes N number of wavefront correction unit, respectively to N number of input port by corresponding space
Light field after light crosspoint carries out individual wavefront correction, when being allowed to export from subsequent output port with input port light field
In parallel.In this way, output port and input port light field keeping parallelism may be implemented the mode and space optic switching device can grade
Connection property.That is, the multichannel light field that output port exports in parallel can continue as next stage mode and spatial light exchange dress
The input port multichannel light field set.
As a further improvement of the above technical scheme, the optical switch module is comprising diffraction optical element, spatial light
Can be realized spatial extent/phase/Polarization Modulation and there is mode and space including modulator and 3D printing optical component
The device of light function of exchange.
Further improvement as above-mentioned technical proposal, the wavefront correction module are comprising diffraction optical element, sky
Between the device that can be realized wavefront correction function including optical modulator and 3D printing optical component.
Apparatus of the present invention can with include free space, it is single mode optical fiber, less fundamental mode optical fibre, multimode fibre, multi-core optical fiber, few
Mould/multimode-multi-core optical fiber, high refractive index optical fibre ring/air core fibre/photonic crystal fiber orbital angular momentum optical fiber institute structure
The optical communication system built is fully compliant, has compatibility and can cascade.
The invention has the following beneficial effects:
1, the method that the present invention provides one mode and spatial light exchange makes input light field pass through different transmission functions and becomes
Implementation pattern and spatial light exchange are changed, in SDM system, implementation pattern selection and spatial choice switch to be realized different
Information exchange between channel.
2, the method and apparatus of one mode and spatial light exchange provided by the invention, are realized using different transmission functions
Different functions of exchange, only need to be loaded in different modes and spatial light crosspoint different transmission functions can be achieved with it is more
Kind information exchange functions, therefore there is reconfigurability.
3, the method and apparatus of one mode and spatial light exchange provided by the invention, can be by input module, output mould
The correcting unit extension of the crosspoint, wavefront correction module of the port number and optical switch module of block, realizes more channels
Information exchange, therefore there is scalability.Optical switch module and wavefront correction module can be diffraction optical element, spatial light
Modulator, 3D printing optical component etc. other may be implemented spatial extent/phase/Polarization Modulation and have mode and spatial light
The device of function of exchange and wavefront correction function.
4, the method and apparatus of one mode and spatial light exchange provided by the invention, are suitable for arranging in different spatial
Column and with same or different light field mode multichannel light field, wherein light field mode can be free space, optical fiber and its
Different light beams (mode) in his transmission medium, such as Gaussian beam (Gauss), orbital angular momentum (vortex) light beam in free space
(OAM), Laguerre-Gaussian beam (LG), Ermy-Gaussian beam (HG), bessel beam (Bessel), vector beam
(Vector) and other spatial extent/phase/Polarization Modulation light beams, eigen mode (Eigenmodes), line for another example in optical fiber
Polarization mode (LP) and orbital angular momentum mode (OAM) etc..The method of one mode and spatial light provided by the invention exchange and
Device can be with free space, single mode optical fiber, less fundamental mode optical fibre, multimode fibre, multi-core optical fiber, few mould/multimode-multi-core optical fiber, high folding
It is sufficiently simultaneous to penetrate optical communication system constructed by the orbital angular momentums optical fiber such as rate optical fibre ring/air core fibre/photonic crystal fiber
Hold, there is compatibility.
Detailed description of the invention
Fig. 1 is mode provided by the invention and space optic switching device schematic diagram；
Fig. 2 is that mode and spatial light exchange provided by the invention improves schematic device；
Fig. 3 is the schematic diagram of N × N orbital angular momentum mode and spatial light exchange method；
Fig. 4 is the phase-plate schematic diagram that the transmission function exchanged for orbital angular momentum mode and spatial light generates；
Fig. 5 is the schematic diagram of N × N orbital angular momentum mode and spatial light exchange improved method；
Fig. 6 is embodiment experimental provision schematic diagram；
Fig. 7 is the experimental result picture that 4 × 4 orbital angular momentum mode lights exchange in embodiment.(a) is 4 × 4 track angles in figure
Momentum Model light exchanges schematic diagram.(b) it is loaded into spatial light modulator and realizes the exchange of 4 × 4 orbital angular momentum mode lights
Phase-plate.It (c) is distribution of light intensity distribution of four ports after the exchange of 4 × 4 orbital angular momentum mode lights.(d)-(g) four
A port is after the exchange of 4 × 4 orbital angular momentum mode lights, each port and an interference with reference to Gaussian beam interference
Figure.
Fig. 8 is the experimental result picture that 4 × 4 orbital angular momentum spatial lights exchange in embodiment.(a) is 4 × 4 track angles in figure
Momentum space light exchanges schematic diagram.(b) it is loaded into spatial light modulator and realizes the exchange of 4 × 4 orbital angular momentum spatial lights
Phase-plate.It (c) is distribution of light intensity distribution of four ports after the exchange of 4 × 4 orbital angular momentum spatial lights.(d)-(g) four
A port is after the exchange of 4 × 4 orbital angular momentum spatial lights, each port and an interference with reference to Gaussian beam interference
Figure.
Fig. 9 is the experimental result picture of 4 × 4 orbital angular momentum modes and spatial light exchange in embodiment.(a) is 4 × 4 in figure
Orbital angular momentum mode and spatial light exchange schematic diagram.It (b) is to be loaded into 4 × 4 orbital angular momentums of realization in spatial light modulator
The phase-plate of mode and spatial light exchange.It (c) is four ports after 4 × 4 orbital angular momentum modes and spatial light exchange
Distribution of light intensity distribution.(d)-(g) four ports are after 4 × 4 orbital angular momentum modes and spatial light exchange, each port
With an interference pattern with reference to Gaussian beam interference.
Specific embodiment
SDM system includes free-space communication system, the communication system of optical fiber telecommunications system and other transmission mediums
System.These systems can be the SDM system based on mode division multiplexing technology, including Gaussian beam in free space
(Gauss), orbital angular momentum (vortex) light beam (OAM), Laguerre-Gaussian beam (LG), Ermy-Gaussian beam (HG), Bei Sai
Your light beam (Bessel), vector beam (Vector) and other spatial extent/phase/Polarization Modulation light beams, eigen mode in optical fiber
Formula (Eigenmodes), linear polarization mode (LP) and orbital angular momentum mode (OAM) etc.；It is also possible to divide multiplexing technology based on core
SDM system, can be compatible with including free space, single mode optical fiber/few mould/multimode-multi-core optical fiber, high refractive index annular
Optical communication system constructed by the orbital angular momentums optical fiber such as optical fiber/air core fibre/photonic crystal fiber-multi-core optical fiber.
Specific embodiments of the present invention will be further explained with reference to the accompanying drawing.It should be noted that for
The explanation of these embodiments is used to help understand the present invention, but and does not constitute a limitation of the invention.In addition, disclosed below
The each embodiment of the present invention in involved technical characteristic can be combined with each other as long as they do not conflict with each other.
The method that the present invention provides one mode and spatial light exchange, specific embodiment are as follows:
Input multichannel light field is located at different spatial, can have identical or different light field mode, by mode and sky
Between light transfer function map function after, output multi-channel light field.When only implementation pattern exchanges transmission function, export more
Relative to input multichannel light field the exchange of light field mode only occurs for road light field, spatial position exchange does not occur, thus implementation pattern light
Exchange；When transmission function only realizes space exchange, relative to input multichannel light field light field mode does not occur for output multi-channel light field
Spatial position exchange only occurs for exchange, to realize that spatial light exchanges；When transmission function implementation pattern and space exchange simultaneously
When, relative to input multichannel light field the exchange of light field mode and spatial position exchange can occur simultaneously for output multi-channel light field, thus
Implementation pattern and spatial light exchange.
In the above method, shown in the expression formula such as formula (1) per light field all the way,
Wherein, N is positive integer, indicates that the port number of input light field, x, y indicate light field perpendicular to the laterally empty of the direction of propagation
Between coordinate position, z is the space coordinate for being parallel to the direction of propagation, F1N(x, y) indicates the spatially transverse distribution of input light field,Indicate input light field function.|A1N(z) | indicate the amplitude letter of input light field
Number,Indicate the phase function of input light field, wherein i indicates imaginary part,It indicates
Input the wave number of light field, λ1NFor optical wavelength, ω1NIndicate the angular frequency of input light field,Indicate the initial phase of input light field
Position, t indicate the light propagation time.By mode and spatial light transfer function H1It is defeated after the map function of (x, y, z, t)
Multichannel light field out, shown in the expression formula such as formula (2) per light field all the way of output
Wherein, N is positive integer, indicates the port number of output light field, F2NThe spatial position letter of (x, y) expression output light field
Number,Indicate output light field function.|A2N(z) | indicate the amplitude of output light field
Function,Indicate the phase function of output light field, wherein i indicates imaginary part,Table
Show the wave number of output light field, λ2NFor optical wavelength, ω2NIndicate the angular frequency of output light field,Indicate the initial of output light field
Phase, t indicate the light propagation time.
When only implementation pattern exchanges transmission function, i.e.,
Relative to input multichannel light field the exchange of light field mode only occurs for the output multi-channel light field, and spatial position exchange does not occur；Work as biography
When delivery function only realizes space exchange, i.e.,The output multi-channel light field is more relative to inputting
The exchange of light field mode does not occur for road light field, and spatial position exchange only occurs；When transmission function implementation pattern and space exchange simultaneously
When, i.e.,Output multi-channel light field is opposite
The exchange of light field mode can occur simultaneously in input multichannel light field and spatial position exchanges.
The present invention provides the device of one mode and spatial light exchange, is described as follows:
The device includes input module 100, optical switch module 200 and output module 300.Wherein, input module 100 and defeated
Module 300 has the port N (N=1,2,3 ...) out, and optical switch module 200 has N number of smooth crosspoint, each smooth crosspoint difference
The a port of each input module 100 is individually converted, a port output of corresponding output module 300.Light exchange
Unit may include any one of mode light crosspoint, spatial light crosspoint, mode and spatial light crosspoint or appoint
It is several；The light field of input port passes through mode light crosspoint, and relative to input port light field only occurs for the light field of output port
Patterns of change, the not exchange between originating port, so that implementation pattern light exchanges；The light field of input port is exchanged by spatial light
Relative to the light field of input port light field mode conversion does not occur for the light field of unit, output port, only occurs between different port
Exchange, thus realize spatial light exchange；The light field of input port is by passing through mode and spatial light crosspoint, output port
Light field light field mode conversion not only occurs relative to the light field of input port, also occur different port between exchange, thus
Implementation pattern and spatial light exchange.
The present invention also provides the improved method that one mode and spatial light exchange, specific embodiment is as follows:
Multichannel light field is inputted after spatial light exchange, the direction of output multi-channel light field can relative to input multichannel light field
It can be deflected, it is no longer parallel with original input multichannel light propagation direction, it brings in this way compatible with subsequent communications system
Property problem.At this point, allowing the multichannel light field after exchanging by spatial light again respectively by the transformation of the transmission function of wavefront correction
Operation, the output multi-channel light field after wavefront correction are parallel with original input multichannel light propagation direction.Output multi-channel light
And input multichannel light field keeping parallelism may be implemented the mode and spatial light exchange method have can cascade, that is to say, that
The multichannel light field exported in parallel can continue the input multichannel light field exchanged as next stage mode and spatial light.
The transmission function for crossing wavefront correction can indicate are as follows:Map function pair
Deflection is corrected, shown in the expression formula such as formula (3) for making output multi-channel light field
Wherein, F3N(x, y) indicates the function of spatial position by output light field after wavefront correction.
As shown in Fig. 2, the present invention provides the improvement device of one mode and spatial light exchange, it is described as follows:
The device in Fig. 1 includes not only input module 100, optical switch module 200 and output module 300, is also handed in light
It changes the mold and is provided with wavefront correction module 400 between block 200 and output module 300.
Input port light field is passed through after spatial light crosspoint, and the direction of propagation is no longer parallel with the original direction of propagation,
It is incompatible with subsequent output port in this way.By after optical switch module 200 add wavefront correction module 400, make by
Light field after spatial light crosspoint is parallel with the original direction of propagation of input port light field, into subsequent output port.
Wavefront correction module 400 includes N number of wavefront correction unit, respectively to N number of input port by corresponding spatial light crosspoint it
Light field afterwards carries out individual wavefront correction, parallel with input port light field when being allowed to export from subsequent output port.In this way, defeated
What exit port and input port light field keeping parallelism may be implemented the mode and space optic switching device can cascade.Namely
It says, the multichannel light field that output port exports in parallel can continue the input port as next stage mode and space optic switching device
Multichannel light field.
The specific embodiment of mode and spatial light exchange provided by the invention is described below, to verify device shown in FIG. 1
Whether can be exchanged in mode with spatial light, embodiment system is the SDM system based on orbital angular momentum, specific structure
It is as follows:
As shown in figure 3, the principle of N × N orbital angular momentum mode and spatial light exchange method is as follows, there is different topology electricity
The multichannel orbital angular momentum beam distribution of lotus number is in space different location, by the phase-plate of different function, the multichannel rail of output
Road angular momentum light beam completes the exchange of orbital angular momentum mode light, the exchange of orbital angular momentum spatial light or orbital angular momentum mode and sky
Between light exchange.Phase-plate is generated by the transmission function of realization different function, as shown in figure 4, phase-plate (a), (b), (c) real respectively
Existing orbital angular momentum mode light exchange, the exchange of orbital angular momentum spatial light and orbital angular momentum mode and spatial light exchange.
As shown in figure 5, the principle of N × N orbital angular momentum mode and spatial light exchange improved method is as follows, by track angle
After the exchange of momentum space light, the multichannel orbital angular momentum light beam propagated in parallel originally becomes the multichannel track angular motion to cross one another
Light beam is measured, brings the compatibility issue with subsequent output system in this way.The wavefront that phase-plate shown in (b) forms in Fig. 4 is rectified
Positive module carries out wavefront correction to multichannel orbital angular momentum light beam respectively, and multichannel orbital angular momentum light beam is made to continue to pass with original
Direction is broadcast unanimously to propagate in parallel, it is compatible with subsequent output system.
Fig. 6 is 4 × 4 orbital angular momentum modes and spatial light exchange test schematic device.Experimental provision includes first, the
Two, third light combination mirror 10,20,30, spatial light modulator 40 and camera 50.Four orbital angular momentums of four port 1-4 incidence
Mode (l=1,2,3,4) is distributed in space different location, port 1 and port 2 in sustained height, and port 3 and port 4 are in addition
One height.It is that height is consistent that beam is closed by the first light combination mirror 10 with port 2 in port 1, parallel two incident beam orbital angular momentums
Light beam.Similarly, it is that height is consistent that beam is closed by the second light combination mirror 20 with port 4 in port 3, parallel two incident beam track angular motions
Light beam is measured by incident beam.Third light combination mirror 30 will be carried out respectively from the two-beam of the first light combination mirror 10 and the second light combination mirror 20
Beam is closed, this two-beam finally closes beam into square four incident beam orbital angular momentum light beams, i.e. four entry ports.By in sky
Between optical modulator 4 load phase-plate and simulate 4 × 4 Optical Switch Nodes, four ports of outgoing are observed by camera 5.
Fig. 7 is the experimental result picture of 4 × 4 orbital angular momentum mode lights exchange.(a) is 4 × 4 orbital angular momentum modes in figure
Light exchanges schematic diagram.It (b) is to be loaded into the phase-plate that the exchange of 4 × 4 orbital angular momentum mode lights is realized in spatial light modulator.
It (c) is distribution of light intensity distribution of four ports after the exchange of 4 × 4 orbital angular momentum mode lights.(d)-(g) four port warps
It crosses after the exchange of 4 × 4 orbital angular momentum mode lights, each port and an interference pattern with reference to Gaussian beam interference.Input terminal
The topological charge number of 1,2,3,4 orbital angular momentum modes of mouth is respectively 1,2,3,4, after the exchange of orbital angular momentum mode,
The topological charge number of 1,2,3,4 orbital angular momentum of output port becomes 3, Isosorbide-5-Nitrae, and 2.
Fig. 8 is the experimental result picture of real 4 × 4 orbital angular momentum spatial lights exchange.(a) is 4 × 4 orbital angular momentums sky in figure
Between light exchange schematic diagram.It (b) is to be loaded into the phase-plate that the exchange of 4 × 4 orbital angular momentum spatial lights is realized in spatial light modulator,
The small picture of insertion shows the more details of phase-plate.It (c) is that four ports are exchanged by 4 × 4 orbital angular momentum spatial lights
Distribution of light intensity distribution later.(d)-(g) four ports are after the exchange of 4 × 4 orbital angular momentum spatial lights, each port with
One interference pattern with reference to Gaussian beam interference.The orbital angular momentum mode that topological charge number is 1,2,3,4 is located at input
Port 1,2,3,4, after the exchange of orbital angular momentum spatial light, exported respectively in output port 4,1,2,3.
Fig. 9 is the experimental result picture of 4 × 4 orbital angular momentum modes and spatial light exchange.(a) is 4 × 4 track angular motions in figure
Amount mode and spatial light exchange schematic diagram.It (b) is to be loaded into spatial light modulator to realize 4 × 4 orbital angular momentum modes and sky
Between light exchange phase-plate.It (c) is that light field of four ports after 4 × 4 orbital angular momentum modes and spatial light exchange is strong
Degree distribution.(d)-(g) four ports are after 4 × 4 orbital angular momentum modes and spatial light exchange, each port and a ginseng
Examine the interference pattern of Gaussian beam interference.The topological charge number of 1,2,3,4 orbital angular momentum mode of input port is respectively 1,2,3,
4, after orbital angular momentum mode and spatial light exchange, input port 1,2,3,4 and output port 4,1,2,3 carry out light friendship
It changes, the topological charge number of corresponding orbital angular momentum mode is 4,1,2,3.
In the present embodiment, we respectively show the exchange of 4 × 4 orbital angular momentum mode lights, track angular motion in an experiment
The exchange of quantity space light and orbital angular momentum mode and spatial light exchange.
The present invention is not only limited to above-mentioned specific embodiment, and persons skilled in the art are disclosed interior according to the present invention
Hold, the present invention can be implemented using other a variety of specific embodiments, it is therefore, all using design structure and think of of the invention
Road does the design of some simple variations or change, both falls within the scope of protection of the invention.
Claims (10)
1. the method for one mode and spatial light exchange, which is characterized in that input multichannel light field is located at different spatial, has
There is identical or different light field mode, after the map function by mode and spatial light transfer function, output multi-channel light field；
When only implementation pattern exchanges transmission function, the output multi-channel light field only occurs light field mode relative to input multichannel light field and hands over
It changes, spatial position exchange does not occur；When transmission function only realizes space exchange, the output multi-channel light field is more relative to inputting
The exchange of light field mode does not occur for road light field, and spatial position exchange only occurs；When transmission function implementation pattern and space exchange simultaneously
When, relative to input multichannel light field the exchange of light field mode and spatial position exchange can occur simultaneously for output multi-channel light field.
2. the method for mode according to claim 1 and spatial light exchange, which is characterized in that the input multichannel light field
Shown in expression formula such as formula (1) per light field all the way,
Wherein, N is positive integer, indicates that the port number of input light field, x, y indicate that light field is sat perpendicular to the horizontal space of the direction of propagation
Cursor position, z are the space coordinate for being parallel to the direction of propagation, F1N(x, y) indicates the spatially transverse distribution of input light field,Indicate input light field function, | A1N(z) | indicate the amplitude letter of input light field
Number,Indicate the phase function of input light field, wherein i indicates imaginary part,Indicate defeated
Enter the wave number of light field, λ1NFor optical wavelength, ω1NIndicate the angular frequency of input light field,Indicate the initial phase of input light field,
T indicates the light propagation time；
Shown in the expression formula such as formula (2) per light field all the way of the output multi-channel light field
Wherein, N is positive integer, indicates the port number of output light field, F2N(x, y) indicates the function of spatial position of output light field,Indicate output light field function, | A2N(z) | indicate the amplitude letter of output light field
Number,Indicate the phase function of output light field, wherein i indicates imaginary part,Indicate defeated
The wave number of light field out, λ2NFor optical wavelength, ω2NIndicate the angular frequency of output light field,Indicate the initial phase of output light field,
T indicates the light propagation time.
3. the method for mode according to claim 2 and spatial light exchange, which is characterized in that
Work as transmission functionOnly implementation pattern exchanges；
Transmission functionOnly realize space exchange；
Work as transmission functionIt realizes simultaneously
Mode and space exchange.
4. the method for mode according to any one of claims 1 to 3 and spatial light exchange, which is characterized in that the input
Multichannel light field is exchanged by spatial light and then deflection is rectified in the map function by the transmission function of wavefront correction respectively
Just, make output multi-channel light field parallel with original input multichannel light propagation direction；Output multi-channel light field and input multichannel light field are protected
Fair row can be realized the mode and spatial light exchange method have can cascade, i.e., the multichannel light field exported in parallel can continue to
The input multichannel light field exchanged as next stage mode and spatial light.
5. the method for mode according to claim 4 and spatial light exchange, which is characterized in that the transmitting of the wavefront correction
Function are as follows:Deflection is corrected, the expression formula such as formula (3) of output multi-channel light field is made
It is shown
Wherein, F3N(x, y) indicates the function of spatial position by output light field after wavefront correction.
6. the method for according to claim 1 or 2 or 3 modes and spatial light exchange, which is characterized in that the light field mode is
Gaussian beam (Gauss) in different light beams or mode, including free space in free space, optical fiber and other transmission mediums,
Orbital angular momentum light beam (OAM), vortex beams, Laguerre-Gaussian beam (LG), Ermy-Gaussian beam (HG), bessel beam
(Bessel), eigen mode in vector beam (Vector) and other spatial extent/phase/Polarization Modulation light beams and optical fiber
(Eigenmodes), linear polarization mode (LP) and orbital angular momentum mode (OAM).
7. the device of one mode and spatial light exchange, which is characterized in that the device includes input module (100), light interchange mode
Block (200) and output module (300)；Wherein, input module (100) and output module (300) have equal N-port, and N is positive integer,
Indicate port number possessed by input module；Optical switch module (200) has N number of smooth crosspoint, each smooth crosspoint difference
The a port of each input module (100) is individually converted, a port output of corresponding output module (300)；Light
Crosspoint includes any one of mode light crosspoint, spatial light crosspoint, mode and spatial light crosspoint or appoints
It is several；To the light field from input port light field patterns of change only occurs for the mode light crosspoint, not between originating port
Exchange；To the light field from input port light field mode conversion does not occur for the spatial light crosspoint, and different ends only occur
Exchange between mouthful；The mode and spatial light crosspoint not only occur light field mode to the light field from input port and become
It changes, the exchange between different port also occurs.
8. the device of mode according to claim 7 and spatial light exchange, which is characterized in that the optical switch module
(200) be provided between output module (300) wavefront correction module (400), for will make by spatial light crosspoint it
Light field afterwards is parallel with the original direction of propagation of input port light field, into subsequent output port；Wavefront correction module (400)
Including N number of wavefront correction unit, light field of N number of input port after corresponding spatial light crosspoint is carried out respectively independent
Wavefront correction, be allowed to from subsequent output port export when it is parallel with input port light field.
9. the device of mode according to claim 7 or 8 and spatial light exchange, which is characterized in that optical switch module (200)
Be comprising including diffraction optical element, spatial light modulator and 3D printing optical component can be realized spatial extent/phase/
Polarization Modulation and the device with mode and spatial light function of exchange；Wavefront correction module (400) be comprising diffraction optical element,
The device that can be realized wavefront correction function including spatial light modulator and 3D printing optical component.
10. the device of mode according to claim 7 or 8 and spatial light exchange, which is characterized in that the device can be with packet
Include free space, single mode optical fiber, less fundamental mode optical fibre, multimode fibre, multi-core optical fiber, few mould/multimode-multi-core optical fiber, high refractive index ring
Optical communication system constructed by shape optical fiber/air core fibre/photonic crystal fiber orbital angular momentum optical fiber is fully compliant, has
Compatibility and can cascade.
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