CN105827329A - System for inhibiting influence of atmospheric turbulence in orbital angular momentum free space optical communication - Google Patents
System for inhibiting influence of atmospheric turbulence in orbital angular momentum free space optical communication Download PDFInfo
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- CN105827329A CN105827329A CN201610332504.2A CN201610332504A CN105827329A CN 105827329 A CN105827329 A CN 105827329A CN 201610332504 A CN201610332504 A CN 201610332504A CN 105827329 A CN105827329 A CN 105827329A
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- light
- beam splitter
- angular momentum
- orbital angular
- light beam
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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
- H04B10/505—Laser transmitters using external modulation
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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
- H04B10/548—Phase or frequency modulation
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
- H04L27/20—Modulator circuits; Transmitter circuits
- H04L27/2096—Arrangements for directly or externally modulating an optical carrier
Abstract
The invention discloses a system for inhibiting influence of atmospheric turbulence in orbital angular momentum free space optical communication, and relates to free space optical technology. The system comprises a polarization beam splitter (10), a first beam splitter (20), a second beam splitter (30), a free space optical modulator (40), an optical frequency mixer (50) and a photoelectric detector (60); communication relations are as follows: the polarization beam splitter (10) is respectively communicated with the first beam splitter (20) and the second beam splitter (30); the first beam splitter (20), the free space optical modulator (40), the optical frequency mixer (50) and the photoelectric detector (60) are sequentially communicated; the second beam splitter (30), the optical frequency mixer (50) and the photoelectric detector (60) are sequentially communicated. Compared with the prior art, the system for inhibiting the influence of the atmospheric turbulence in the orbital angular momentum free space optical communication has the advantages that separation of different orbital angular momentum (OAM) channel information in light beams is implemented; the influence of the atmospheric turbulence is inhibited to a certain extent, and communication system performances are improved; the structure is simple, and implementation is easy.
Description
Technical field
The present invention relates to Space Optical Communication Technologies, particularly relate to a kind of orbital angular momentum space optical communication suppresses the system of atmospheric turbulance impact.
Background technology
Orbital angular momentum (OrbitalAngularMomentum, OAM) light beam refers to that its wavefront comprises the light beam of a helical phase structure, and helical phase expression formula is exp (il θ), wherein, θ is angular coordinate, and l is azimuth index, is defined as the topological charge number of OAM light beam.The optical field distribution that topological charge number is different is also referred to as different OAM patterns.
Research about the application in optical communications of OAM light beam in recent years starts to rise.In optical communications, the OAM light beam of different topology lotus number can be used as different multipling channel transmission information.The Main way of research is to be used in FSO by OAM light beam at present, and the OAM light carrying information arrives receiving terminal after atmospheric propagation one segment distance.But OAM light beam is when propagating in an atmosphere, because the distortion of phase place occur in the random fluctuation of air refraction in turbulent atmosphere, the information received can be interfered, cause transmitting systematic function and decline, frequently can lead to communication and cannot be carried out.The distortion of phase place is the principal element causing system performance degradation.In order to overcome the impact of atmospheric turbulance, from the angle of optical field, the most common way is to use ADAPTIVE OPTICS SYSTEMS that laser beam with aberration is carried out wavefront correction, thus improves systematic function.2014, University of Southern California YongxiongRen et al. proposes a set of Hartmann's adaptive optics and compensates system to correct wavefront distortion, they utilize fundamental-mode gaussian beam to try to achieve wavefront distortion situation (RenY as " probe " light beam, XieG, HuangH, etal.Adaptiveopticscompensationofmultipleorbitalangularm omentumbeamspropagatingthroughemulatedatmosphericturbule nce [J] .Opticsletters, 2014,39 (10): 2845-2848).null2015,GuodongXie et al. proposes a kind of new departure without probe beam,Utilize, based on zernike polynomial stochastic parallel gradient descent (SPGD) algorithm, OAM light beam is carried out phase aberration correction (XieG,RenY,HuangH,etal.PhasecorrectionforadistortedorbitalangularmomentumbeamusingaZernikepolynomials-basedstochastic-parallel-gradient-descentalgorithm[J].Opticsletters,2015,40 (7): 1197-1200).ADAPTIVE OPTICS SYSTEMS needs wavefront or the light distribution of constantly detection light beam, dynamically control rectification module according to result of detection light beam is corrected, the effect although really communication tool being had some improvement, but common configuration complexity is relatively costly, also it is difficult to be widely used in practical communication occasion.
Summary of the invention
The purpose of the present invention is that the shortcoming and defect overcoming prior art to exist, it is provided that suppress the system of atmospheric turbulance impact in a kind of orbital angular momentum space optical communication.The present invention is no need to carry out correcting and detecting wavefront or the light distribution of light beam extraly, there is no the rectification module of complexity yet, compare existing adaptive optics turbulent flow Restrain measurement there is simple in construction easily to realize lower-cost advantage, be more suitable for extensively using in practical communication occasion.
For reaching above-mentioned purpose, technical scheme is implemented as follows:
Orbital angular momentum space optical communication suppresses the system (abbreviation system) of atmospheric turbulance impact
Native system includes polarization beam apparatus, the 1st beam splitter, the 2nd beam splitter, spatial light modulator, optical mixer and photodetector;
Its connected relation is:
Polarization beam apparatus connects with the 1st beam splitter and the 2nd beam splitter respectively;
1st beam splitter, spatial light modulator, optical mixer and photodetector are sequentially communicated;
2nd beam splitter, optical mixer and photodetector are sequentially communicated.
Compared with prior art, the present invention has following advantages and a good effect:
1. the separation of different OAM channel informations in light beam is achieved;
Inhibit the impact of turbulent flow the most to a certain extent, improve communication system performance;
3. simple in construction, it is easy to accomplish.
Accompanying drawing explanation
Fig. 1 is the block diagram of native system;
In figure:
10 polarization beam apparatus;
20 the 1st beam splitters;
30 the 2nd beam splitters;
40 spatial light modulators,
41 the 1st spatial light modulators,
42 the 2nd spatial light modulators,
……
4M M spatial light modulator, M is positive integer, 1≤M≤50;
50 optical mixers (90 °),
51 the 1st optical mixers,
52 the 2nd optical mixers,
……
5N N optical mixer, N is positive integer, 1≤N≤50;
60 photodetectors,
61 the 1st photodetectors,
62 the 2nd photodetectors,
……
6P P photodetector, P is positive integer, 1≤P≤50.
Detailed description of the invention
The present invention is further described with embodiment below in conjunction with the accompanying drawings.
1, overall
Such as Fig. 1, native system includes polarization beam apparatus the 10, the 1st beam splitter the 20, the 2nd beam splitter 30, spatial light modulator 40, optical mixer 50 and photodetector 60;
Its connected relation is:
Polarization beam apparatus 10 connects with the 1st beam splitter the 20 and the 2nd beam splitter 30 respectively;
1st beam splitter 20, spatial light modulator 40, optical mixer 50 and photodetector 60 are sequentially communicated;
2nd beam splitter 30, optical mixer 50 and photodetector 60 are sequentially communicated.
2, functional part (26S Proteasome Structure and Function)
1) polarization beam apparatus 10
Polarization beam apparatus 10 is a kind of optics that two parts that in light beam, polarization direction is mutually orthogonal can be made to distinguish directive different directions.
Its function is, the 2nd probe beam b2 and the 2nd signal beams a2 that in the light beam c2 that will receive, polarization direction is mutually orthogonal separate.
2) the 1st beam splitter 20
1st beam splitter 20 is the optics of a kind of multi-beam that light beam is equally divided into directive different directions.
Its function is, the 2nd probe beam b2 is divided into light beam e1, e2 ... eY, Y are positive integer, 1≤Y≤50.
3) the 2nd beam splitter 30
2nd beam splitter 30 is the optics of a kind of multi-beam that light beam is equally divided into directive different directions.
Its function is, the 2nd signal beams a2 is divided into light beam d1, d2 ... dX, X are positive integer, 1≤X≤50.
4) spatial light modulator 40
Spatial light modulator 40 be a kind of applied information amount in the device of two-dimensional optical data field, it can change the phase place of two-dimension light field, polarization and intensity distributions spatially.
Including the 1st, 2 ... M spatial light modulator 41,42 ... 4M, M are positive integers, 1≤M≤50;
Its function is at light beam e1, e2 ... the helical phase factor that in the optical field distribution of eY, affix is different, and the helical phase factor that every light beam adds is equal to the helical phase factor of a branch of OAM light in the 1st signal beams a1.
5) optical mixer 50
Optical mixer 50 is a kind of four groups of light beams two light beams injecting in frequency mixer being divided into and being still made up of two-beam, and make the optics of the phase contrast being respectively provided with 0 °, 90 °, 180 ° and 270 ° of two-beam in four groups of light beams, it is generally used for coordinating photodetector that light beam carries out relevant detection.
Including the 1st, 2 ... N optical mixer 51,52 ... 5N, N are positive integers, 1≤N≤50;
Its function is, the 1st, 2 ... the two light beams injected is divided into the four groups of light beams having out of phase difference by N optical mixer respectively, and for coordinating next step Photoelectric Detection.
6) photodetector 60
Photodetector 60 is a kind of device that light is changed into the signal of telecommunication
Including the 1st, 2 ... P photodetector 61,62 ... 6P, P are positive integers, 1≤P≤50;
Its function is that inject four groups of light beams are changed into the four road signals of telecommunication, for demodulating information.
3, working mechanism
The light beam that information transmitting terminal is launched should include the most modulated a branch of Gaussian beam (the referred to as the 1st probe beam b1) and another bundle light beam (the referred to as the 1st signal beams a1) through multi beam OAM light multiplexing, light beam a1 Zhong Ge road OAM light beam all carries the information of having gone up through ovennodulation, and light beam a1 is orthogonal with the polarization direction of the OAM light beam in light beam b1;Light beam a1 and light beam b1 closes bundle and is sent by transmitting terminal for light beam c1, light beam c1, arrives receiving terminal after turbulent atmosphere A, and now light beam c1 there occurs distortion, and the light beam after distortion is c2.
At receiving terminal, light beam c2 first passes around polarization beam apparatus 10, and the probe beam in light beam is from signal beams because polarizing the different two-way that are divided into, and isolated probe beam is the 2nd probe beam b2, and isolated signal beams is the 2nd signal beams a2.
The 2nd probe beam b2 separated by polarization beam apparatus 10 is divided into light beam e1, e2 through beam splitter 20 ... eY, the quantity of the light beam separated is identical with the quantity of the OAM light beam carrying information in the 2nd signal beams a2,2nd signal beams a2 is also divided into d1, d2 through another beam splitter 30 simultaneously ... dX, and the quantity of the light beam being divided into is also identical with the quantity of the OAM light beam carrying information in the 2nd signal beams a2.
Light beam e1, e2 ... eY is respectively by the 1st, 2 ... M spatial light modulator 41,42 ... 4M, the helical phase factors different in loading, the helical phase factor of a branch of OAM light that the helical phase factor that every light beam adds all is respectively equal in the 1st signal beams a1.
Light beam d1, d2 that 2nd signal beams a2 separates ... dX respectively with light beam e1, e2 of separating in the 2nd probe beam b2 ... eY enters the 1st, 2 jointly ... N optical mixer 51,52 ... 5N, then the 1st, 2 ... P photodetector 61,62 ... interfere on 6P, produce photoelectric current g1, g2 ... gW, W is positive integer, 1≤W≤50.Each road photoelectric current can demodulate the information of transmission in a channel that obtains.
Light beam by atmospheric turbulance affected and mainly shown as distorting of phase place;1st probe beam b1 there occurs phase distortion by after turbulent atmosphere, becomes the 2nd probe beam b2;Also there is phase distortion by after turbulent atmosphere in the 1st signal beams a1, becomes the 2nd signal beams a2;Because by identical turbulent atmosphere, so the phase distortion that the 2nd probe beam b2 is relative to the 1st probe beam b1 is identical with the 2nd signal beams a2 phase distortion relative to the 1st signal beams a1;On each photodetector, light beam d1, d2 ... dX respectively with light beam e1, e2 ... eY interferes;In interference, the phase distortion of light beam is cancelled, and interferes the electric current formed not affected by atmospheric turbulance.Light beam d1, d2 ... the most a branch of all the same from the 2nd signal beams a2 of dX is made up of different OAM light beams, due to light beam e1, e2 ... eY is loaded with the different helical phase factors respectively, and have between the field of the different helical phase factor and there is orthogonality, so the OAM light beam only containing the helical phase factor identical with light beam e1 in light beam d1 can produce photoelectric current in interference, the OAM light beam not comprising the identical helical phase factor does not the most produce photoelectric current;Light beam d2, d3 ... dX and light beam e2, e3 ... the interventional procedures of eY is in like manner.The photoelectric current that on the most each detector, only a branch of OAM light beam produces, only carries the information in a branch of OAM light beam, it is achieved that the separation of the information of different channels.
Claims (7)
1. an orbital angular momentum space optical communication suppresses the system of atmospheric turbulance impact, it is characterised in that:
Including polarization beam apparatus (10), the 1st beam splitter (20), the 2nd beam splitter (30), spatial light modulator (40), optical mixer (50) and photodetector (60);
Its connected relation is:
Polarization beam apparatus (10) connects with the 1st beam splitter (20) and the 2nd beam splitter (30) respectively;
1st beam splitter (20), spatial light modulator (40), optical mixer (50) and photodetector (60) are sequentially communicated;
2nd beam splitter (30), optical mixer (50) and photodetector (60) are sequentially communicated.
2. a kind of orbital angular momentum space optical communication as described in claim 1 suppresses the system of atmospheric turbulance impact, it is characterised in that:
Described polarization beam apparatus (10) is a kind of optics that two parts that in light beam, polarization direction is mutually orthogonal can be made to distinguish directive different directions, and the 2nd probe beam (b2) that in the light beam c2 that will receive, polarization direction is mutually orthogonal separates with the 2nd signal beams (a2).
3. a kind of orbital angular momentum space optical communication as described in claim 1 suppresses the system of atmospheric turbulance impact, it is characterised in that:
The 1st described beam splitter (20) is the optics of a kind of multi-beam that light beam is equally divided into directive different directions, and the 2nd probe beam (b2) is divided into light beam e1, e2 ... eY, Y are positive integer, 1≤Y≤50.
4. a kind of orbital angular momentum space optical communication as described in claim 1 suppresses the system of atmospheric turbulance impact, it is characterised in that:
The 2nd described beam splitter (30) is the optics of a kind of multi-beam that light beam is equally divided into directive different directions, and the 2nd signal beams (a2) is divided into light beam d1, d2 ... dX, X are positive integer, 1≤X≤50.
5. a kind of orbital angular momentum space optical communication as described in claim 1 suppresses the system of atmospheric turbulance impact, it is characterised in that:
Described spatial light modulator (40) be a kind of applied information amount in the device of two-dimensional optical data field, it can change the phase place of two-dimension light field, polarization and intensity distributions spatially;
Including the 1st, 2 ... M spatial light modulator (41,42 ... 4M), M is positive integer, 1≤M≤50;
At light beam e1, e2 ... the helical phase factor that in the optical field distribution of eY, affix is different, the helical phase factor that every light beam adds is equal to the helical phase factor of a branch of OAM light in the 1st signal beams (a1).
6. a kind of orbital angular momentum space optical communication as described in claim 1 suppresses the system of atmospheric turbulance impact, it is characterised in that:
Described optical mixer (50) is a kind of four groups of light beams two light beams injecting in frequency mixer being divided into and being still made up of two-beam, and make the optics of the phase contrast being respectively provided with 0 °, 90 °, 180 ° and 270 ° of two-beam in four groups of light beams, it is generally used for coordinating photodetector that light beam carries out relevant detection;
Including the 1st, 2 ... N optical mixer (51,52 ... 5N), N is positive integer, 1≤N≤50;
1st, 2 ... the two light beams injected is divided into the four groups of light beams having out of phase difference by N optical mixer respectively, for coordinating next step Photoelectric Detection.
7. a kind of orbital angular momentum space optical communication as described in claim 1 suppresses the system of atmospheric turbulance impact, it is characterised in that:
Described photodetector (60) is a kind of device that light is changed into the signal of telecommunication,
Including the 1st, 2 ... P photodetector (61,62 ... 6P), P is positive integer, 1≤P≤50;
Inject four groups of light beams are changed into the four road signals of telecommunication, for demodulating information.
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Cited By (5)
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CN106357317A (en) * | 2016-12-06 | 2017-01-25 | 南通大学 | Method for restraining atmosphere turbulence interference in free-space optical communication |
CN106352992A (en) * | 2016-09-06 | 2017-01-25 | 北京理工大学 | Self-adaptive correction method and system of wavefront-free and probe-free distortion vortex light beam |
CN108088801A (en) * | 2017-12-07 | 2018-05-29 | 电子科技大学 | Laser NDT device based on 90 ° of optical mixer units |
CN109768829A (en) * | 2019-01-09 | 2019-05-17 | 中南民族大学 | Atmospheric turbulance distortion compensating system and its method in orbital angular momentum optical transport |
CN109818707A (en) * | 2019-03-15 | 2019-05-28 | 哈尔滨工业大学 | The safety of physical layer capacity boost method of OAM light beam multiplexing |
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