CN110149150A - Communication multiplex system and method based on column vector beam (CVB) - Google Patents
Communication multiplex system and method based on column vector beam (CVB) Download PDFInfo
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- CN110149150A CN110149150A CN201910257730.2A CN201910257730A CN110149150A CN 110149150 A CN110149150 A CN 110149150A CN 201910257730 A CN201910257730 A CN 201910257730A CN 110149150 A CN110149150 A CN 110149150A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/002—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials
- G02B1/005—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of materials engineered to provide properties not available in nature, e.g. metamaterials made of photonic crystals or photonic band gap materials
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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
- G02B6/02—Optical fibres with cladding with or without a coating
- G02B6/02295—Microstructured optical fibre
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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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- 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
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/2912—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form characterised by the medium used for amplification or processing
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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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
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
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Abstract
This application involves a kind of communication multiplex systems for being based on column vector beam (CVB), which includes: laser, information coding module, beam splitting module, CVB generation module, Multiplexing module, photonic crystal fiber transmission module；The laser is for generating laser beam；The information coding module obtains the laser beam for carrying information for encoding to the laser beam；The beam splitting module is used to the laser beam for carrying information being divided into multichannel light beam, a corresponding channel per light beam all the way；The CVB generation module is used to for multichannel light beam being respectively converted into the column vector beam of not same order；The Multiplexing module is used to the column vector beam of multichannel not same order synthesizing coaxial column vector beam；The photonic crystal fiber transmission module is used to for the coaxial column vector beam focusing being coupled to inside photonic crystal fiber and transmit, which has the advantages that transmission loss is small.Furthermore, it is also proposed that one kind is based on the communication multiplexing method of column vector beam (CVB).
Description
Technical field
The present invention relates to technical field of photo communication, are multiplexed more particularly, to a kind of communication based on column vector beam (CVB)
System and method.
Background technique
With the development of the social economy, requirement of the people to the transmission rate of data is higher and higher.In current technology item
Under part, bandwidth of an optical fiber resource is limited.So in the long run, seeking new communication multiplexing dimension is trend of the times.And
Column vector beam (Cylindrical Vector Beam, CVB) provides a completely new multiplexing dimension for optical communication system,
Can under the premise of not broadening system bandwidth significantly lifting system capacity.
It is all at present to concentrate on the transmission of CVB light beam in free space for research of the CVB light beam in terms of optic communication
And communication, but there is a problem of that loss is big in the transmission of free space and communication, cause the distance of transmission limited.
Summary of the invention
Based on this, it is necessary in view of the above-mentioned problems, it is small logical based on column vector beam (CVB) to provide a kind of transmission loss
Believe multiplex system and method.
One kind being based on the communication multiplex system of column vector beam (CVB), the system comprises: laser, information coding mould
Block, beam splitting module, CVB generation module, Multiplexing module, photonic crystal fiber transmission module；The laser is for generating laser
Beam；The information coding module obtains the laser beam for carrying information for encoding to the laser beam；The beam splitting mould
Block is used to the laser beam for carrying information being divided into multichannel light beam；The CVB generation module for converting multichannel light beam respectively
For the column vector beam of not same order；The Multiplexing module be used for by multichannel not same order column vector beam synthesize with jack-post vector light
Beam；The photonic crystal fiber transmission module is used to for the coaxial column vector beam focusing being coupled to inside photonic crystal fiber
It is transmitted.
In one embodiment, the beam splitting module includes: the first coupler, the first erbium-doped fiber amplifier, second mixes
Doped fiber amplifier, the second coupler and third coupler；First coupler is used to carry the laser beam point of information
For two-way light beam, wherein light beam by first erbium-doped fiber amplifier carries out light beam amplification all the way, then by described the
Two couplers are divided into the road Liang Gezi light beam；Another way light beam carries out light beam amplification by second erbium-doped fiber amplifier, so
It is divided into the road Liang Gezi light beam by the third coupler afterwards.
In one embodiment, the CVB generation module includes multiplexer channel, includes different vortex glass in each channel
Piece, the vortex slide are used to the laser beam in channel being converted to column vector beam, and different vortex slide corresponding conversions are not at
The column vector beam of same order.
In one embodiment, the Multiplexing module includes: multiple beam splitters；The beam splitter is used for multichannel not same order
Column vector beam be combined into coaxial column vector beam.
In one embodiment, the photonic crystal fiber transmission module includes: the first object lens and photonic crystal fiber；Institute
The first object lens are stated for the coaxial column vector beam focusing received to be coupled to inside the photonic crystal fiber；It is described
Photonic crystal fiber be used for transmission include multistage column vector beam coaxial column vector beam.
In one embodiment, the system also includes adjustment module, the adjustment module include: Polarization Controller with
Collimator, each channel are all corresponding with a Polarization Controller and collimator；The Polarization Controller is for adjusting respective channel
In light beam polarization；The collimator is used to the light beam adjusted being converted to collimated light beam.
In one embodiment, the system also includes: demultiplexing module, the demultiplexing module include: the second object lens
With vortex slide；The light beam that second object lens are used to export the photonic crystal fiber carries out divergent transport to the vortex
Slide；The vortex slide is for demultiplexing the light beam for including multistage column vector.
In one embodiment, the system also includes: authentication module, the authentication module include: condenser lens and CCD
Camera；The condenser lens is used to the light beam after demultiplexing focusing on CCD camera；The CCD camera is for monitoring output
Light beam polarization state variation.
In one embodiment, the authentication module further include: variable optical attenuator, third erbium-doped fiber amplifier, band
Bandpass filter, photodetector and programmable error detector；The variable optical attenuator is used for strong by changing different light beams
Degree is to obtain the bit error rate under different beam intensities；The third erbium-doped fiber amplifier is used to amplify light beam,
The bandpass filter is used for filter noise；The photodetector is used to be converted to light beam electric signal transmission and can compile to described
Journey error detector；The programmable error detector is used to detect the error rate of the information carried in the laser beam.
One kind being based on the communication multiplexing method of column vector beam (CVB), is applied to communication multiplex system, the system packet
It includes: laser, information coding module, beam splitting module, CVB generation module, Multiplexing module, photonic crystal fiber transmission module；Institute
The method of stating includes:
The laser beam of generation is sent to the information coding module by the laser；
The information coding module encodes the laser beam, obtains the laser beam for carrying information, takes described
Laser beam with information is sent to the beam splitting module；
The laser beam for carrying information is divided into multichannel light beam by the beam splitting module, is transferred to the CVB generation module；
The multichannel light beam is respectively converted into the column vector beam of not same order by the CVB generation module, will be described in multichannel
The column vector beam of same order is not transferred to the Multiplexing module；
The column vector beam of multichannel not same order is synthesized coaxial column vector beam by the Multiplexing module, then will it is described coaxially
Column vector beam passes to the photonic crystal fiber transmission module；
The coaxial column vector beam focusing is coupled in photonic crystal fiber by the photonic crystal fiber transmission module
It is transmitted in portion.
Above-mentioned communication multiplex system and method based on column vector beam (CVB), by that will include multistage column vector
Light beam focusing, which is coupled to inside photonic crystal fiber, to be transmitted, since column vector beam has multiple multiplexing dimensions, so tool
There is a bigger information capacity, photonic crystal fiber has the advantages that high information capacity, low-loss, and column vector beam is taken
Information carries out efficient transmission in photonic crystal fiber, greatly reduces loss.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the structural block diagram of the communication multiplex system in one embodiment based on column vector beam (CVB)；
Fig. 2 is the field distribution schematic diagram of difference CVB in one embodiment；
Fig. 3 is the structural schematic diagram of photonic crystal fiber (PCF) in one embodiment；
Fig. 4 is the structural block diagram of beam splitting module in one embodiment；
Fig. 5 is the experiment schematic diagram of the communication multiplex system in one embodiment based on column vector beam (CVB)；
Fig. 6 is the experimental provision schematic diagram for transmitting CVB light beam in one embodiment in PCF；
Fig. 7 is the flow chart of the communication multiplexing method in one embodiment based on column vector beam (CVB).
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
As shown in Figure 1, in one embodiment it is proposed that a kind of communication multiplex system for being based on column vector beam (CVB),
The system includes: laser 10, information coding module 20, beam splitting module 30, CVB generation module 40, Multiplexing module 50 and photon
Crystal optical fibre transmission module 60；
Laser 10 is for generating laser beam；Information coding module 20 is taken for encoding to the laser beam
Laser beam with information；Beam splitting module 30 is used to the laser beam for carrying information being divided into multichannel light beam；CVB generation module 40
For multichannel light beam to be respectively converted into the column vector beam of not same order；Multiplexing module 50 is used for the column vector of multichannel not same order
Light beam synthesizes coaxial column vector beam；Photonic crystal fiber transmission module 60 is used to the coaxial column vector beam focusing coupling
It is transmitted inside to photonic crystal fiber.
Wherein, laser 10 is the light source for generating laser beam.Information coding module is used to laser beam carrying out information coding,
So that laser beam is carried information, includes light beam source in information coding module, light beam source can come from codified pictcure generator
(PPG), information coding is carried out to laser beam by codified pictcure generator PPG, obtains the laser beam for carrying information.
Beam splitting module 30 is used to for laser beam to be divided into more parts, forms multichannel light beam.In one embodiment, beam splitting module 30
In include N divide fiber coupler, additionally may include: that Er-doped fiber is put for the laser beam for carrying information to be divided into N parts
Big device, for being amplified to per light beam all the way.
Correspondingly include the channel converted to multichannel light beam in CVB generation module 40, includes not in each channel
Multichannel light beam, has thus been respectively converted into the column vector beam of not same order by same vortex slide.For example, being vortexed for 1 rank
Slide (VWP1) generates 1 rank CVB light beam, generates 2 rank CVB light beams by a 2 rank vortex slides (VWP2), in addition, passing through half
The combination of slide HWP and vortex slide can produce arbitrary order CVB light beam.For example, the generation of a 3 rank CVB light beams can lead to
The combination for crossing VWP1-HWP-VWP2 obtains, and the generation of -3 rank CVB light beams can pass through the group of HWP-VWP1-HWP-VWP2-HWP
Conjunction obtains.
CVB light beam is a kind of orthogonal column arrow pattern based on polarization singular point, and the different CVB light beam of order is mutually orthogonal,
And the identical CVB light beam of order is there is also there are two mutually orthogonal polarization states, for example, be all 1 rank CVB light beam it is radial partially
Vibration light and angularly polarized light.As shown in Figure 2, it is shown that can be by the eigen mode electricity of the CVB transmitted in photonic crystal fiber (PCF)
The field distribution of field from ± 1 to ± 4.Arrow indicates the direction of electric field or the local polarisation characteristic of CVB, by being azimuthally rotated
Polarization direction can extract the sequence of CVB.In one embodiment, available ± 1, ± 2, ± 3, ± 4 rank of CVB generation module
CVB light beam.
Multiplexing module 50 is used to synthesize the column vector beam of multichannel not same order all the way, will by using multiple beam splitters
Multichannel light beam is all synthesized to all the way, that is, synthesizes coaxial column vector beam.
Photonic crystal fiber transmission module 60 will be for that will include that the coaxial column vector beam of multistage CVB light beam focuses coupling
To inside photonic crystal fiber, such photonic crystal fiber can transmit multistage CVB light beam.In one embodiment
In, photonic crystal fiber is formed by stomata micro-structure and by stomata micro-structure according to the photon band gap that periodic arrangement obtains
, outer layer is surrounded by photonic crystal.
As shown in figure 3, for the structural schematic diagram of photonic crystal fiber (PCF) in one embodiment, the photonic crystal fiber
For 19 born of the same parents' air-core photon crystal optical fibers, the diameter of hollow is 21.87 μm, and the diameter of the micro-structure of the covering of airport is 3.84
μm, belong to Photonic Bandgap-photonic Crystal Fibers, fibre cladding is pressed by airport is similar to cellular structural periodicity arrangement shape
At, add a small airport at a cellular unit center of fuse position, so that defect is introduced, formation core area.Due to light
It transmits, so its speed ratio transmits fast 30% in solid core optical fiber, and is realized by multichannel coaxial transmission CVB in air
Bigger information capacity transmission.
As shown in figure 4, in one embodiment, the beam splitting module includes: the first coupler 302, the first Er-doped fiber
Amplifier 304, the second erbium-doped fiber amplifier 306, the second coupler 308 and third coupler 310；First coupler
302 for being divided into two-way light beam for the laser beam for carrying information, wherein light beam passes through first Erbium-doped fiber amplifier all the way
Device 304 carries out light beam amplification, then divides by second coupler 308 for the road Liang Gezi light beam；Another way light beam passes through institute
It states the second erbium-doped fiber amplifier 306 and carries out light beam amplification, then divide by the third coupler 310 for the road Liang Gezi light
Beam.
Wherein, firstly, laser beam is divided into two-way by the first coupler 302, then per all the way all by an er-doped
Then the amplification of fiber amplifier light beam will form in total 4 road light beams per two-way is further divided into all the way again, will for the differentiation of narration
The two-way light beam being divided into below is known as " sub- road light beam ".Light beam is divided into 4 tunnels, carries out CVB respectively all the way for every convenient for subsequent
The conversion of light beam obtains multistage CVB light beam.
In one embodiment, the CVB generation module includes multiplexer channel, includes different vortex glass in each channel
Piece, the vortex slide are used to the laser beam in channel being converted to column vector beam, and different vortex slide corresponding conversions are not at
The column vector beam of same order.
Wherein, different vortex slides is used to generate the column vector beam of not same order, and different column vector beams have difference
Polarization direction, have more capacity.In order to enable the multichannel column vector beam generated is uncorrelated, setting is per all the way with difference
The single mode light of length is transferred to vortex slide.In one embodiment, after light beam being divided into 4 tunnels, pass through different length respectively
Single mode optical fiber transmitting, then respectively by collimator by laser beam be converted to collimated laser beam be transmitted to vortex slide progress
The conversion of CVB light beam, for example, 4 road CVB light beams being converted to are respectively the CVB of+3, -3 ,+2 and -2 ranks.
In one embodiment, the Multiplexing module includes: multiple beam splitters；The beam splitter is used for multichannel not same order
Column vector beam be combined into coaxial column vector beam.
Wherein, multichannel is being obtained not after the column vector beam of same order, can passed through multichannel light beam by multiple beam splitters
Reflection or transmission set to all the way to get arrive coaxial vector beam.
In one embodiment, the photonic crystal fiber transmission module includes: the first object lens and photonic crystal fiber；Institute
The first object lens are stated for the coaxial column vector beam focusing received to be coupled to inside the photonic crystal fiber；It is described
Photonic crystal fiber be used for transmission include multistage column vector beam coaxial column vector beam.
Wherein, photonic crystal fiber transmission module includes the first object lens and photonic crystal fiber, and the first object lens are used for light
Beam focusing is coupled to inside photonic crystal fiber, and the same of multistage column vector beam can be thus transmitted by photonic crystal fiber
Jack-post vector beam.
In one embodiment, the above-mentioned communication multiplex system based on column vector beam (CVB) further include: adjustment module,
The adjustment module includes: Polarization Controller and collimator, and each channel is all corresponding with a Polarization Controller and collimator；Institute
Polarization Controller is stated for adjusting the polarization of the light beam in respective channel；The collimator is used to turn the light beam adjusted
It is changed to collimated light beam.
Wherein, in order to preferably obtain CVB light beam, before being transferred to CVB generation module, firstly, the light in each channel
Beam is all adjusted by Polarization Controller, and the polarization of light beam is adjusted, in order to ensure that all channels are subsequently generated be all from
By the cross-polarization CVB state in space.After having adjusted, all light beam is collimated by collimator to obtain directional light
Beam generates CVB light beam to vortex slide convenient for parallel radiation.
In one embodiment, the above-mentioned communication multiplex system based on column vector beam (CVB) further include: demultiplexing mould
Block, the demultiplexing module include: the second object lens and vortex slide；Second object lens are for defeated to the photonic crystal fiber
Light beam out carries out divergent transport to the vortex slide；The vortex slide be used for include multistage column vector light beam into
Row demultiplexing.
Wherein, it after using photonic crystal fiber transmission, is demultiplexed in receiving end, demultiplexing is by object lens and whirlpool
Rotation slide is come what is realized, and the effect of the first object lens of the second object lens and front here is on the contrary, the first object lens of front are used to gather
Coke, the second object lens here are to dissipate CVB light beam, are then irradiated to vortex slide and are demultiplexed, i.e., will be original
Multistage CVB separation.The vortex piece of same order is not used to separate the CVB light beam of not same order, for example, if there is ± 2 and ± 3 ranks, wherein
± 2 need to separate using two vortex slides with ± 3 ranks, and further, the CVB light beam of same order passes through polarization beam apparatus
(PBS) it separates.
In one embodiment, the above-mentioned communication multiplex system based on column vector beam (CVB) further include: authentication module,
The authentication module includes: condenser lens and CCD camera；The condenser lens is used to focus on the light beam after demultiplexing
CCD camera；The CCD camera is used to monitor the polarization state variation of the light beam of output.
It wherein, will be after demultiplexing using condenser lens after being demultiplexed by vortex slide to CVB light beam
Light beam focuses on CCD camera, will pass through the polarization state variation of the light beam of CCD camera detection output.
In one embodiment, the authentication module further include: variable optical attenuator, third erbium-doped fiber amplifier, band
Bandpass filter, photodetector and programmable error detector；The variable optical attenuator is used for strong by changing different light beams
Degree is to obtain the bit error rate under different beam intensities；The third erbium-doped fiber amplifier is used to amplify light beam,
The bandpass filter is used for filter noise；The photodetector is used to be converted to light beam electric signal transmission and can compile to described
Journey error detector；The programmable error detector is used to detect the error rate of the information carried in the laser beam.
It wherein, further include variable optical attenuation in order to which the result to CVB light beam by photonic crystal fiber transmission is verified
Device, for detecting the bit error rate under different beam intensities by changing different beam intensities.In order to preferably test light beam
Card carries out signal amplification using third erbium-doped fiber amplifier, removes noise using bandpass filter later, then will be after filtering
Light beam photoelectric conversion carried out by photodetector obtain electric signal, then give electric signal transmission to programmable error-detecting
Device is detected using error rate of the programmable error detector to the information carried in laser beam.
As shown in figure 5, in one embodiment, the experiment signal of the communication multiplex system based on column vector beam (CVB)
Figure.Firstly, laser beam (for example, using wavelength for 1550nm) is generated by laser (laser), subsequently into MZM (modulator),
Information coding is carried out to laser beam in conjunction with programmable graphics generator PPG and linear amplifier (Bias), it then will be after coding
Laser beam is transferred to 2 branch/couplers (1x2 in figure) by SMF (single mode optical fiber), will carry the laser beam point of information
Be two, EDFA (erbium-doped fiber amplifier) amplification is respectively adopted in latter two right channel, latter two branch respectively by one 2 points
Coupler is divided into two again, obtains 4 branches, and then 4 branches are with different length (respectively 0m, 10m, 20m and 40m)
Single mode optical fiber transmission, the signal to ensure four channels are uncorrelated.Four channels are output to finally by collimator (COL) collimation
(VWP is vortex slide to different vortex slides, is divided into VWP1 and VWP2, and HWP is half slide, and the two combination can produce different
CVB light beam) four kinds of different CVB light beams the CVB of ± 3 ranks (± 2 and) are generated, in addition, being respectively adopted before collimator COL partially
Vibration controller FC is adjusted the polarization of light beam.After four channels generate CVB light beam using vortex slide, using three points
By four branch combinations at coaxial beam, coaxial beam is then coupled to photonic crystal fiber PCF (is beam device (BS) in figure
Air-core PCF, i.e. hollow PCF) in transmitted.It is verified to export result, the light beam exported from PCF is by another
A object lens are collected, and the effect of object lens is that coaxial CVB light beam dissipated to (Coaxial CVBs is after object lens in figure
The schematic diagram of coaxial CVB light beam), it is then demultiplexed by vortex slide (VWP) as before, every single order needs a vortex
Slide, ± 2 then need two vortex slides (being only schematic diagram in figure) with ± 3 ranks, also need polarization beam apparatus with single order
PBS (not shown) further separates.Then CCD is focused of the light beam by condenser lens (Lens), is polarized by CCD
The image observation of state.Further, it is also possible to transmit the light beam in the light power meter being connect with single mode optical fiber to measure errored bit
Rate BER, is not shown in the figure.Furthermore it is also possible to by the beam Propagation after demultiplexing to variable optical attenuator (VOA) for observing
Light beam can also greatly, then filtered out by bandpass filter (BPF) by the variation of BER under different beam intensities using EDFA
Then basic noise is converted into electric signal by photodetector (PD), for may be programmed error detector (PED).
It being found through experiments that, the insertion loss of ± 2 and ± 3 rank CVB is respectively 8.27dB, 8.19dB, 9.91dB,
9.88dB.The propagation loss for detecting in hollow PCF ± 2 and ± 3 rank CVB respectively using cut-off method is 0.72dB/m, 0.59dB/
m.The insert loss of ± 1, ± 4 rank CVB is 7.15dB, 7.36dB, 12.14dB, 12.52dB.Insertion loss includes coupling
Loss and propagation loss.
As shown in fig. 6, for the experimental provision schematic diagram of CVB light beam is transmitted in one embodiment in PCF.It is by wavelength
The laser beam of 1550nm is collimated device (COL) collimation by single mode optical fiber (SMF), then generates CVB by vortex slide (VWP)
Light beam, different VWP slides can be used to generate different CVB light beams (customized can be arranged in an experiment).Then pass through
Object lens (OBJ), which are coupled in PCF (photonic crystal fiber), to be transmitted, in order to which laser beam to be aligned with PCF, using five dimensions
Translation stage moves the relative position of the two as auxiliary, makes its alignment.After transmitting in PCF, pass through another object lens
(OBJ) output is collected, is verified so as to subsequent.In one embodiment, the light beam of output can also be divided using beam splitter
For two beams, pattern detection and power detection are carried out respectively.In figure, fiber-optic twist is adjusted by Polarization Controller (FC) and bending lures
Lead birefringent, object lens OBJ is demultiplexed to VWP (vortex slide) is transferred to after beam collection, and such CVB light beam is converted into
Then the luminous point of gaussian shape carries out the filtering of hot spot using polariscope Polarizer, then poly- by condenser lens Lens
Coke arrives CCD, is then changed by the polarization state of the CVB light beam of Near Infrared CCD detection output, furthermore it is also possible to will demultiplexing
Light beam coupling to single mode optical fiber be transferred to light power meter carry out power detection.CVB is demonstrated by the experimental provision in such as Fig. 6
Light beam can transmit in PCF.
As shown in fig. 7, in one embodiment it is proposed that a kind of communication multiplexing method for being based on column vector beam (CVB),
Applied to communication multiplex system, which includes: laser, information coding module, beam splitting module, CVB generation module, multiplexing mould
Block, photonic crystal fiber transmission module；Method includes:
Step 702, the laser beam of generation is sent to information coding module by laser.
Step 704, information coding module encodes laser beam, obtains the laser beam for carrying information, will carry
The laser beam of information is sent to beam splitting module.
Step 706, the laser beam for carrying information is divided into multichannel light beam by beam splitting module, is transferred to CVB generation module.
Step 708, multichannel light beam is respectively converted into the column vector beam of not same order by CVB generation module, by multichannel difference
The column vector beam of rank is transferred to Multiplexing module.
Step 710, the column vector beam of multichannel not same order is synthesized coaxial column vector beam by Multiplexing module, then will be coaxial
Column vector beam passes to photonic crystal fiber transmission module.
Step 712, the focusing of coaxial column vector beam is coupled in photonic crystal fiber by photonic crystal fiber transmission module
It is transmitted in portion.
Each technical characteristic of above embodiments can be combined arbitrarily, for simplicity of description, not to above-described embodiment
In each technical characteristic it is all possible combination be all described, as long as however, the combination of these technical characteristics be not present lance
Shield all should be considered as described in this specification.
The several embodiments of the application above described embodiment only expresses, the description thereof is more specific and detailed, but simultaneously
The limitation to the application the scope of the patents therefore cannot be interpreted as.It should be pointed out that for those of ordinary skill in the art
For, without departing from the concept of this application, various modifications and improvements can be made, these belong to the guarantor of the application
Protect range.Therefore, the scope of protection shall be subject to the appended claims for the application patent.
Claims (10)
1. the communication multiplex system that one kind is based on column vector beam (CVB), which is characterized in that the system comprises: laser, letter
Cease coding module, beam splitting module, CVB generation module, Multiplexing module, photonic crystal fiber transmission module；
The laser is for generating laser beam；
The information coding module obtains the laser beam for carrying information for encoding to the laser beam；
The beam splitting module is used to the laser beam for carrying information being divided into multichannel light beam, a corresponding channel per light beam all the way；
The CVB generation module is used to for multichannel light beam being respectively converted into the column vector beam of not same order；
The Multiplexing module is used to the column vector beam of multichannel not same order synthesizing coaxial column vector beam；
The photonic crystal fiber transmission module is used to for the coaxial column vector beam focusing being coupled in photonic crystal fiber
It is transmitted in portion.
2. system according to claim 1, which is characterized in that the beam splitting module includes: the first coupler, the first er-doped
Fiber amplifier, the second erbium-doped fiber amplifier, the second coupler and third coupler；
First coupler is used to the laser beam for carrying information being divided into two-way light beam, wherein light beam is by described all the way
One erbium-doped fiber amplifier carries out light beam amplification, is then divided into the road Liang Gezi light beam by second coupler；
Another way light beam carries out light beam amplification by second erbium-doped fiber amplifier, then by the third coupler point
For the road Liang Gezi light beam.
3. system according to claim 1, which is characterized in that the CVB generation module includes multiplexer channel, each channel
In include different vortex slides, the vortex slide is used to the laser beam in channel being converted to column vector beam, different whirlpools
Slide corresponding conversion is revolved into the column vector beam of not same order.
4. system according to claim 1, which is characterized in that the Multiplexing module includes: multiple beam splitters；The beam splitting
Device is used to the column vector beam of multichannel not same order being combined into coaxial column vector beam.
5. system according to claim 1, which is characterized in that the photonic crystal fiber transmission module includes: the first object
Mirror and photonic crystal fiber；
The coaxial column vector beam focusing that first object lens are used to receive is coupled in the photonic crystal fiber
Portion；
The photonic crystal fiber be used for transmission include multistage column vector beam coaxial column vector beam.
6. system according to claim 1, which is characterized in that the system also includes: adjustment module, the adjustment module
It include: Polarization Controller and collimator, each channel is all corresponding with a Polarization Controller and collimator；
The Polarization Controller is used to adjust the polarization of the light beam in respective channel；
The collimator is used to the light beam adjusted being converted to collimated light beam.
7. system according to claim 1, which is characterized in that the system also includes: demultiplexing module, the demultiplexing
Module includes: the second object lens and vortex slide；
The light beam that second object lens are used to export the photonic crystal fiber carries out divergent transport to the vortex slide；
The vortex slide is for demultiplexing the light beam for including multistage column vector.
8. system according to claim 7, which is characterized in that the system also includes: authentication module, the authentication module
It include: condenser lens and CCD camera；
The condenser lens is used to the light beam after demultiplexing focusing on CCD camera；
The CCD camera is used to monitor the polarization state variation of the light beam of output.
9. system according to claim 8, which is characterized in that the authentication module further include: variable optical attenuator, third
Erbium-doped fiber amplifier, bandpass filter, photodetector and programmable error detector；
The variable optical attenuator is used to obtain the bit error rate under different beam intensities by changing different beam intensities；
For the third erbium-doped fiber amplifier for amplifying to light beam, the bandpass filter is used for filter noise；
The photodetector is used to be converted to light beam electric signal transmission to the programmable error detector；
The programmable error detector is used to detect the error rate of the information carried in the laser beam.
10. one kind is based on the communication multiplexing method of column vector beam (CVB), it is applied to the base as described in any in claim 1-9
In the communication multiplex system of column vector beam (CVB), which is characterized in that the described method includes:
The laser beam of generation is sent to the information coding module by the laser；
The information coding module encodes the laser beam, obtains the laser beam for carrying information, carries described
The laser beam of information is sent to the beam splitting module；
The laser beam for carrying information is divided into multichannel light beam by the beam splitting module, is transferred to the CVB generation module；
The multichannel light beam is respectively converted into the column vector beam of not same order by the CVB generation module, by difference described in multichannel
The column vector beam of rank is transferred to the Multiplexing module；
The column vector beam of multichannel not same order is synthesized coaxial column vector beam by the Multiplexing module, then will the same jack-post arrow
Amount light beam passes to the photonic crystal fiber transmission module；
The photonic crystal fiber transmission module by the coaxial column vector beam focusing be coupled to inside photonic crystal fiber into
Row transmission.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104597559A (en) * | 2015-01-22 | 2015-05-06 | 西北工业大学 | Photonic crystal optical fiber for generating column vector optical field |
| WO2017219118A1 (en) * | 2016-06-23 | 2017-12-28 | Ung Bora | Photonic crystal fiber methods and devices |
| CN108900275A (en) * | 2018-06-29 | 2018-11-27 | 深圳市深光谷科技有限公司 | Space division multiplexing communication system and the method and system for demultiplexing CVB channel |
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|---|---|---|---|---|
| CN104597559A (en) * | 2015-01-22 | 2015-05-06 | 西北工业大学 | Photonic crystal optical fiber for generating column vector optical field |
| WO2017219118A1 (en) * | 2016-06-23 | 2017-12-28 | Ung Bora | Photonic crystal fiber methods and devices |
| CN108900275A (en) * | 2018-06-29 | 2018-11-27 | 深圳市深光谷科技有限公司 | Space division multiplexing communication system and the method and system for demultiplexing CVB channel |
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