CN108333687B - A kind of multiplexer demultiplexer based on orbital angular momentum light - Google Patents
A kind of multiplexer demultiplexer based on orbital angular momentum light Download PDFInfo
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- CN108333687B CN108333687B CN201810032390.9A CN201810032390A CN108333687B CN 108333687 B CN108333687 B CN 108333687B CN 201810032390 A CN201810032390 A CN 201810032390A CN 108333687 B CN108333687 B CN 108333687B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29379—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device
- G02B6/2938—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means characterised by the function or use of the complete device for multiplexing or demultiplexing, i.e. combining or separating wavelengths, e.g. 1xN, NxM
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- Optical Couplings Of Light Guides (AREA)
Abstract
The present invention relates to the technical fields of optic communication, more particularly, to a kind of multiplexer demultiplexer based on orbital angular momentum light.A kind of multiplexer demultiplexer based on orbital angular momentum light, wherein including multiplexer main body, single mode optical fiber, less fundamental mode optical fibre, the single mode optical fiber is in one end of multiplexer main body, the other end of the less fundamental mode optical fibre in multiplexer main body；The multiplexer main body is an integrated optical device, it includes shaping region, Fourier transformation area, geometric transformation area, phase correction area；Shaping region and geometric transformation area are located at the left and right in Fourier transformation area, and are just a focal lengths.Device of the present invention has many advantages, such as that production is simple, low, the operation is stable is lost, is easy to use, can be widely applied to free space optical communication, fiber optic communication, the fields such as quantum communications.
Description
Technical field
The present invention relates to the technical fields of optic communication, more particularly, to a kind of multiplexer based on orbital angular momentum light
Demultiplexer.
Background technique
Vortex light field is that have the special light field of screw type wavefront.Vortex light is due to its unique kinetic characteristics, track
The features such as angular motion flow characteristic and topological structure, therefore it is in optical micro-manipulation, optical microscopy imaging, optic communication, quantum information, light
The fields such as speckle and remote sensing all have important research value, are especially expanding optical communication capability field with great
Potentiality.
Multiplexing technology based on wavelength-division multiplex is the current main means for expanding optical communication capability, with existing multiplexing skill
Art moves closer to technical bottleneck, and people need a kind of new multiplexing technology that can be compatible with existing multiplexing technology.And vortex light has
Some characteristics: orbital angular momentum value range is infinity, and the vortex light for possessing different orbital angular momentums is orthogonal so that whirlpool
Optically-active becomes one of the optimal candidate of next-generation multiplexing technology.Therefore, multiplex/demultiplex vortex light with expand optical communication capability at
For research emphasis.
Traditional light beam multiplex/demultiplex method is using beam splitter, and two-way light can be carried out conjunction Shu Yufen by beam splitter
Beam, therefore can use multiplexing and demultiplexing that beam splitter does vortex beams.But light beam is every just to be had by a beam splitter
A certain proportion of energy loss, and two-way light can only be separated and be closed beam and then need when needing to close Shu Duolu light by beam splitter
More beam splitters, and generate more energy losses.So being had using the multiplexing that beam splitter carries out light beam with demultiplexing
System complex, the big disadvantage of energy loss.The multiplexing of another vortex beams and Deplexing method are to utilize Dammam vortex light
Grid complete multiplexing and the demultiplexing of vortex light.Multichannel can be become same along the Gauss light of different angle incidence by Darman raster
Coaxial vortex light can also be separated in different angles, and become vortex light again Gauss again by the orthogonal vortex light of axis
Light, but the energy loss of Dammam vortex grating is larger, when Dammam vortex grating operates the road N light beam, only 1/N's
Energy is utilized effectively.
In order to the multiplex/demultiplex vortex beams under low-loss, optics geometric transformation is introduced in vortex beams
In multiplexing and demultiplexing.Optics geometric transformation can by between the vortex light and inclined plane light wave of circular ring shape intensity distribution into
Conversion, inclined plane light wave are then separated to different channels by fourier lense to row mutually.Theoretically, optics geometric transformation does not have
There is energy loss, without other energy losses other than being lost caused by optical device, therefore optics geometric transformation has loss
Low advantage.But optics geometric transformation needs are completed by multiple optical devices, therefore have system many and diverse, are influenced by the external world
Greatly, the disadvantages of inconvenient to use.
In order to which optics geometric transformation is directly applied to actual production, in life, it would be desirable to it is a kind of low-loss,
Integrated device easy to use.
Summary of the invention
The present invention in order to overcome at least one of the drawbacks of the prior art described above, provides a kind of based on orbital angular momentum light
Multiplexer demultiplexer makes a small-sized integrator using the method for heating induction refraction index changing using femto-second laser
Part, for realizing under low-loss, the multiplexing of vortex beams and demultiplexing.
The technical scheme is that a kind of multiplexer demultiplexer based on orbital angular momentum light, wherein including multiplexing
Device main body, single mode optical fiber, less fundamental mode optical fibre, the single mode optical fiber is in one end of multiplexer main body, and less fundamental mode optical fibre is in multiplexer main body
The other end；The multiplexer main body is an integrated optical device, it includes shaping region, Fourier transformation area, geometric transformation
Area, phase correction area；Shaping region and geometric transformation area are located at the left and right in Fourier transformation area；Shaping region and Fourier transformation
The distance in area is just a focal length；Geometric transformation area is just a focal length at a distance from Fourier transformation area.
Further, the multiplexer main body is by any in glass, ceramics, crystal, organic polymer transparent material
One kind is made.
Device is using femtosecond laser as processing method；Femtosecond laser irradiates material internal, heats irradiated area, induction
Illuminated area's refractive index changes, and changes the position in illuminated area, can inscribe out the refraction needed in material internal
Certain function may be implemented in rate area, the index region, and combining multiple index regions can be in device inside in device inside
Integrate a micro-optical systems.
Multiplexing device is used using orbital angular momentum light as carrier wave, and device can be multiplexed the signal through ovennodulation, modulation
Physical dimension includes amplitude/intensity, time, polarization, the wavelength/frequency of light wave.
Device can be used for free space multiplexing, can also be used in Networks of Fiber Communications；If applying in free space,
It does not need and fiber coupling, input is coupled directly into the device with output light；If applying in Networks of Fiber Communications, institute
It states device one end and couples multiple single mode optical fibers, the other end couples a less fundamental mode optical fibre.
The single mode optical fiber quantity be it is multiple, the quantity and arrangement mode of single mode optical fiber can be varied as desired.
The single mode optical fiber inputs Gauss light, and the light of less fundamental mode optical fibre output is the vortex light for possessing orbital angular momentum.
Compared with prior art, beneficial effect is: this device has the characteristics that integrated, and the total losses of this device are small；This
The loss of device is mainly derived from fiber coupling, and material absorbs；In addition to this without other losses.This device is easy to use；
This device possesses the external structure with fiber coupling, and when use, which only needs for optical fiber to be directly accessed, can be used.
Detailed description of the invention
Fig. 1 is overall structure of the present invention.
Specific embodiment
The attached figures are only used for illustrative purposes and cannot be understood as limitating the patent；In order to better illustrate this embodiment, attached
Scheme certain components to have omission, zoom in or out, does not represent the size of actual product；To those skilled in the art,
The omitting of some known structures and their instructions in the attached drawings are understandable.Being given for example only property of positional relationship is described in attached drawing
Illustrate, should not be understood as the limitation to this patent.
As shown in Figure 1, present embodiment is multiplex process.M is multiplied by n single mode optical fiber 1 according to certain space two-dimensional mode
Arrangement, i.e. m row are arranged multiplied by n.Assuming that being arranged in 2 rows in a manner of planar rectangular multiplied by 2 as shown in Figure 1, have 2 multiplied by 2 optical fiber
Column have 2 multiplied by 2 road incident lights.The Gauss light wave transmitted in single mode optical fiber 1 enters device main body 2, into excessively short-range transmission
Shaping region 2.1 is reached afterwards.Shaping region 2.1 is made of multiple identical zonules, and the center of each zonule corresponds to every road
The center of launching spot.Gauss light wave is in Fourier transformation area under the collective effect in shaping region 2.1 and Fourier transformation area 2.2
2.2 back focal plane becomes rectangle light wave, and the length of rectangular light spot is greater than width, and focuses on same point.The phase of each rectangle light wave
It is determined by every road incident light relative to the center in Fourier transformation area 2.2.Geometric transformation area 2.3 is located at Fourier transformation area
2.2 back focal plane.The different rectangle light wave of phase is irradiated to same position in geometric transformation area 2.3 simultaneously, and is transformed into strong
Spend into the ring-shaped light spot of circular ring shape.This group of ring-shaped light spot reaches phase correction area 2.4 by of short duration transmission.Phase correction area
2.4 emergent light is in the axis rail angular momentum light for radially having phase change.The radial phase gradient and angular phase of emergent light
Phase decision of the potential gradient by rectangular light spot, and phase of the phase of rectangular light spot by incident light relative to Fourier transformation area 2.2
That is, the radial phase gradient of emergent light and the topological charge of orbital angular momentum are by incident light relative to Fourier transformation is determined to position
The relative position in area 2.2 determines.Axis light is thereafter coupled into less fundamental mode optical fibre 3.
Specific embodiment 2: a kind of light based on orbital angular momentum described in present embodiment and specific embodiment one
The difference of multiplexer/demultiplexer is that it is to be arranged in m row to multiply that single mode optical fiber as input, which only presses a dimension arrangement,
With 1 column.Output light at this time corresponds to only in the orbital angular momentum light for angularly having phase change.
Specific embodiment 3: a kind of light based on orbital angular momentum described in present embodiment and specific embodiment one
The difference of multiplexer/demultiplexer is that for this device reversely used as demultiplexing device, less fundamental mode optical fibre 3 is used as input terminal, and
Single mode optical fiber 1 is used as output end.The axis rail angular momentum light transmitted in less fundamental mode optical fibre 3 enters device main body 2 and enters phase immediately
Correct area 2.4 in position.Orbital angular momentum light becomes rectangular light spot, rectangular light spot at this time after the effect in phase correction area 2.4
Phase is mixed and disorderly.The mixed and disorderly hot spot of phase enters geometric transformation area 2.3 after of short duration transmission.The mixed and disorderly rectangular light of phase
Spot passes through the rectangle plane wave become inclined in geometric transformation area 2.3, i.e., distributed rectangular is presented in the intensity of hot spot, and phase is then
It changes linearly.Fourier transformation area 2.2 is all a focal length at a distance from geometric transformation area 2.3, shaping region 2.1.Tilt journey
Different positions can be focused onto after Fourier changes by spending different rectangle plane waves.Sky of each hot spot on back focal plane
Between position all determined by the topological charge size and phase gradient in the radial direction of incident orbital angular momentum hot spot.Become in Fourier
The intensity for changing the hot spot at the back focal plane/shaping region 2.1 in area 2.2 is all elongated.The hot spot of this group of strip subsequently enters whole
Shape area 2.1, and be shaped in corresponding each zonule as class Gauss light.Subsequent class Gauss is optically coupled into single mode optical fiber
In.
A kind of specific implementation method four: light based on orbital angular momentum described in present embodiment and specific embodiment three
The difference of multiplexer/demultiplexer is, the orbital angular momentum light of input is while corresponding defeated radially without phase change
The single mode optical fiber of outlet only arranges in one direction.
Multiplexer in of the embodiment of the present invention is because use the side that femtosecond laser heating material induced index changes
Method, by a multiplex/demultiplex system integration a to device inside, therefore all multiplexings and demultiplexing process are all in device
Inside is completed, and does not receive the disturbance of air, the operation is stable small by external influence.
Device of the present invention is refractive device, without waste energy other than in addition to a small amount of scattering and absorbing, therefore this
Invention overcomes the big disadvantage of the loss in existing some multiplex/demultiplex technologies, reduces the loss of energy.
Device of the present invention can directly can use in free space, can also be coupled with optical fiber, use model
It encloses wide.
What device of the present invention developed and used is the space attribute of light beam, this multiplexing technology and other for utilizing light
The multiplexing technology of physical characteristic be compatible, therefore device of the present invention can be with the wavelength-division multiplex in fiber optic communication, time-division
Multiplexing, the multiplexing technologies such as palarization multiplexing use simultaneously.
Multiplexing demultiplexing device part used in the present invention due to using geometric transformation as principle of multiplexing, using femtosecond plus
Work transparent type material, therefore lossy low, the operation is stable, it is easy to use the advantages that, can be widely used logical with free space optical
Letter, fiber optic communication, the field of quantum communications.
Obviously, the above embodiment of the present invention be only to clearly illustrate example of the present invention, and not be pair
The restriction of embodiments of the present invention.For those of ordinary skill in the art, may be used also on the basis of the above description
To make other variations or changes in different ways.There is no necessity and possibility to exhaust all the enbodiments.It is all this
Made any modifications, equivalent replacements, and improvements etc., should be included in the claims in the present invention within the spirit and principle of invention
Protection scope within.
Claims (7)
1. a kind of multiplexer demultiplexer based on orbital angular momentum light, which is characterized in that including multiplexer main body (2), single mode
Optical fiber (1), less fundamental mode optical fibre (3), the single mode optical fiber (1) is in one end of multiplexer main body (2), and less fundamental mode optical fibre (3) is in multiplexer
The other end of main body (2)；The multiplexer main body (2) is an integrated optical device, it includes shaping region (2.1), Fourier
Shift zone (2.2), geometric transformation area (2.3), phase correction area (2.4)；Shaping region (2.1) and geometric transformation area (2.3) are respectively
Positioned at the left and right of Fourier transformation area (2.2)；Shaping region (2.1) is just a coke at a distance from Fourier transformation area (2.2)
Away from；Geometric transformation area (2.3) is just a focal length at a distance from Fourier transformation area (2.2).
2. a kind of multiplexer demultiplexer based on orbital angular momentum light according to claim 1, it is characterised in that: described
Multiplexer main body (2) be made by any in glass, ceramics, crystal, organic polymer transparent material.
3. a kind of multiplexer demultiplexer based on orbital angular momentum light according to claim 1, it is characterised in that: device
Using femtosecond laser as processing method；Femtosecond laser irradiates material internal, heats irradiated area, and illuminated area is induced to reflect
Rate changes, and changes the position in illuminated area, can inscribe out the index region needed, the refractive index in material internal
Certain function may be implemented in area, and a micro-optics can be integrated in device inside in device inside by combining multiple index regions
System.
4. a kind of multiplexer demultiplexer based on orbital angular momentum light according to claim 1, it is characterised in that: multiplexing
Device is used using orbital angular momentum light as carrier wave, and device can be multiplexed the signal through ovennodulation, and the physical dimension of modulation includes
Amplitude/intensity, time, polarization, the wavelength/frequency of light wave.
5. a kind of multiplexer demultiplexer based on orbital angular momentum light according to claim 1, it is characterised in that: device
It can be used for free space multiplexing, can also be used in Networks of Fiber Communications；If applying in free space, do not need and optical fiber
Coupling, input are coupled directly into the device with output light；If applying in Networks of Fiber Communications, described device one end coupling
It closes multiple single mode optical fibers (1), the other end couples a less fundamental mode optical fibre (6).
6. a kind of multiplexer demultiplexer based on orbital angular momentum light according to claim 1, it is characterised in that: described
Single mode optical fiber (1) quantity be it is multiple, the quantity and arrangement mode of single mode optical fiber can be varied as desired.
7. a kind of multiplexer demultiplexer based on orbital angular momentum light according to claim 1, it is characterised in that: described
Single mode optical fiber (1) input Gauss light, less fundamental mode optical fibre (3) output light be the vortex light for possessing orbital angular momentum.
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| CN110838886B (en) * | 2019-11-15 | 2021-03-23 | 深圳大学 | Orthogonal linear polarization multimode vortex optical demultiplexing device and method |
| CN111045215A (en) * | 2020-01-03 | 2020-04-21 | 佛山科学技术学院 | Multichannel optical orbital angular momentum beam shaping optical system |
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