CN104104435A - Wireless laser communication transmission method and system - Google Patents
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Abstract
The invention discloses a wireless laser communication transmission method and system. The system includes a light source laser, a secondary mirror and a primary mirror, and a first light modulator, a second light modulator and a beam splitter are arranged in sequence between the light source laser and the secondary mirror. The first light modulator performs light intensity modulation on a laser beam from the light source laser, modulates to a laser beam of hollow light intensity, and transmits to the second light modulator; the second light modulator performs phase modulation on the laser beam from the first light modulator, modulates an equipotential phase plane to a plane, and transmits the modulated laser beam to the beam splitter; the beam splitter transmits the laser beam from the second light modulator to the secondary mirror; the secondary mirror reflects the laser beam from the beam splitter to the primary mirror; and the primary mirror reflects the laser beam from the secondary mirror and emits the reflected laser beam. The scheme of the wireless laser communication transmission system in the invention can improve emission efficiency of emitting a wireless laser signal.
Description
Technical field
The present invention relates to wireless communication technology, relate in particular to wireless laser communication transmission method and system.
Background technology
At present, free space radio laser communication system because its cost is low, good confidentiality, be convenient to the advantages such as quickly networking, become an important branch in the military and space communications field.
Referring to Fig. 1, be the structural representation of prior art wireless laser communication transmission system, it comprises light source laser, primary mirror and secondary mirror;
Described secondary mirror, receives the laser beam from described light source laser, reflexes to described primary mirror;
Described primary mirror is launched after reflecting from the laser beam of described secondary mirror.
Primary mirror and secondary mirror are coaxial, and radio telecommunicaltion system also often becomes autocollimator system, and the radio telecommunicaltion system of Fig. 1 is specially mark's desorption-Cassegrain formula telescope of reviving.The light beam that light source laser sends is Gaussian beam, in order to improve communication distance, must expand the waist radius of Gaussian beam as far as possible, and then the compression angle of divergence, so just need to adopt heavy caliber radio telecommunicaltion system, and in figure, the value of R is larger.
Because autocollimator system has without transmission loss, do not produce aberration and be easy to process bigbore reason, become at present at widely used optical antenna in free-space optical communication system.In thering is above-mentioned advantage, autocollimator system, owing to mostly adopting primary mirror and the coaxial structure of secondary mirror, causes the phenomenon that light is blocked greatly, sometimes even can be in the light more than 50%, this is very unfavorable for improving communication distance, must solve by the system reform.
Reflective optic antenna shown in Fig. 1 is because secondary mirror blocks, and understands some light and can not launch to be received optical antenna and receive, concrete transmitting schematic diagram shown in Figure 2; So just reduce luminous efficiency, unfavorable for remote free space laser communication.Make a concrete analysis of as follows:
The laser beam of now light source laser transmitting is Gaussian beam, and the light intensity of Gaussian beam can be expressed as:
Wherein, I
0represent center light intensity, W
0represent effective cross-section radius, I
0and W
0be all constant, ρ, z are variable, and z is the optical axis direction shown in Fig. 1, and ρ is radial axle, namely perpendicular to half journal axle in the plane of z axle, W(z) represent the waist radius at z place;
The cross section luminous power of Gaussian beam can be expressed as:
By (1) substitution (2), obtain the luminous power at place with a tight waist, can be considered in the luminous power at place with a tight waist the luminous power that is transmitted into the laser beam on secondary mirror, be expressed as:
The light intensity of the Gaussian beam in ring-like aperture, the light intensity of the Gaussian beam of namely launching through the primary mirror of Fig. 1, is expressed as:
Therefore, Cassegrain telescope emission effciency is:
For r/R=1/3, the system of R=100mm, calculates telescope emission effciency, is the curve relation figure between waist radius and emission effciency referring to Fig. 3.Even if as can be seen from the figure choose suitable waist radius, Cassegrain telescope emission effciency maximum can only reach 72%, has 30% energy loss nearly to fall.
There is equally Problem of Shading at receiving terminal, as shown in Figure 4.The light beam that carries signal arrives and receives optical antenna, is first converged on secondary mirror by primary mirror reflection, then arrives detector through secondary mirror reflection, extracts information through demodulator circuit, completes communication.But dotted portion light beam is blocked by secondary mirror as shown in Figure 4, can not finally arrive detector, also just become link load.
Therefore, adopt traditional free space laser communication system based on reflective optic antenna, all can be due to the inherent defect of reflective optic antenna at transmitting terminal and receiving terminal, can lose light energy greatly, this is very disadvantageous in remote free space laser communication, is problem demanding prompt solution.
In sum, at least there is following defect in existing wireless laser communication transmission method: due to blocking of secondary mirror, the emission effciency that causes carrying out the transmitting of wireless laser signal is lower.
Summary of the invention
The invention provides a kind of wireless laser communication transmission system, this system can improve the emission effciency of carrying out the transmitting of wireless laser signal.
The invention provides a kind of wireless laser communication transmission method, the method can improve the emission effciency of carrying out the transmitting of wireless laser signal.
A kind of wireless laser communication transmission system, this system comprises light source laser, secondary mirror and primary mirror, this system also sets gradually the first optical modulator, the second optical modulator and beam splitter between light source laser and secondary mirror;
Described the first optical modulator, carries out intensity modulation to the laser beam from light source laser, is modulated into the laser beam of light intensity hollow, is transferred to described the second optical modulator;
Described the second optical modulator, carries out position to the laser beam from described the first optical modulator and modulates mutually, and equipotential is practised physiognomy and is modulated to a plane, and the laser beam after modulation is transferred to described beam splitter;
Described beam splitter, will be transparent to described secondary mirror from the laser beam of described the second optical modulator;
Described secondary mirror, will reflex to described primary mirror from the laser beam of described beam splitter;
Described primary mirror is launched after reflecting from the laser beam of described secondary mirror.
A kind of wireless laser communication transmission method, the method comprises:
The first optical modulator carries out intensity modulation to the laser beam from light source laser, is modulated into the laser beam of light intensity hollow, is transferred to the second optical modulator;
The second optical modulator, to the modulation mutually of the position of the laser signal from the first optical modulator, is practised physiognomy equipotential to be modulated to a plane, and the laser beam after modulation is transferred to beam splitter;
Beam splitter will be transparent to secondary mirror from the laser beam of the second optical modulator;
The laser beam from beam splitter is reflexed to primary mirror by secondary mirror;
Primary mirror is launched after reflecting from the laser beam of secondary mirror.
Can find out from such scheme, the Gaussian beam that the present invention produces light source laser is modulated, and is modulated into the laser beam of light beam hollow; Particularly, between light source laser and secondary mirror, set gradually the first optical modulator, the second optical modulator and beam splitter, the first optical modulator carries out intensity modulation to the laser beam from light source laser, is modulated into the laser beam of light intensity hollow, is transferred to described the second optical modulator; The second optical modulator, to the modulation mutually of the position of the laser signal from the first optical modulator, is practised physiognomy equipotential to be modulated to a plane, and the laser beam after modulation is transferred to described beam splitter; Described beam splitter, will be transparent to described secondary mirror from the laser beam of described the second optical modulator.Like this, owing to being transmitted into the laser beam for hollow of secondary mirror, namely the light intensity of beam center position is almost nil, like this, even if center is blocked, but because central light beam is that sky can not exert an influence to emission effciency, and then solve existing technical problem, improved the emission effciency of carrying out the transmitting of wireless laser signal.
Brief description of the drawings
Fig. 1 is the structural representation of wireless laser communication transmission system in prior art;
Fig. 2 is the schematic diagram that in prior art, wireless laser communication transmission system is carried out laser signal transmitting;
Fig. 3 is the emission effciency schematic diagram that in prior art, wireless laser communication transmission system is carried out laser signal transmitting;
Fig. 4 is the schematic diagram that in prior art, wireless laser communication transmission system is carried out laser signal reception;
Fig. 5 is the structural representation of wireless laser communication transmission system of the present invention;
Fig. 6 is the indicative flowchart of wireless laser communication transmission method of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
The light beam that light source laser produces is Gaussian beam, adopts Gaussian beam in the time that free space transmits, and will cause beam emissions efficiency lower because secondary mirror blocks.If Gaussian beam can be modulated, be modulated into the laser beam of light beam hollow, and this luminous energy transmits in free space; Like this, even if center is blocked, but because central light beam intensity is the zero existing technical problem that can not exert an influence to emission effciency, and then solved.
Referring to Fig. 5, for the structural representation of wireless laser communication transmission system of the present invention, this system comprises light source laser, secondary mirror and primary mirror, it is characterized in that, this system also sets gradually the first optical modulator, the second optical modulator and beam splitter between light source laser and secondary mirror;
Described the first optical modulator, carries out intensity modulation to the laser beam from light source laser, is modulated into the laser beam of light intensity hollow, is transferred to described the second optical modulator;
Described the second optical modulator, carries out position to the laser beam from the first optical modulator and modulates mutually, and equipotential is practised physiognomy and is modulated to a plane, and the laser beam after modulation is transferred to described beam splitter;
Described beam splitter, will be transparent to described secondary mirror from the laser beam of described the second optical modulator;
Described secondary mirror, will reflex to described primary mirror from the laser beam of described beam splitter;
Described primary mirror is launched after reflecting from the laser beam of described secondary mirror.
Further, for whole system is compacter, can adopt transmitting-receiving integrated structure.For this situation, this system also comprises detector;
Described primary mirror, the laser beam of the light intensity hollow of reception space transmission, reflexes to described secondary mirror;
Described secondary mirror, receives the laser beam from described primary mirror, is transferred to described beam splitter after reflecting;
Described beam splitter, receives the laser beam from described secondary mirror, is transmitted into described detector after reflecting;
Described detector, receives the laser beam from described beam splitter, converts the signal of telecommunication to.
What described the second optical modulator was exported is the laser beam of hollow, for example, be TEM
10the single order Gaussian beam of pattern.Light beam after the second light modulator modulates is TEM
10the single order Gaussian beam of pattern, adopts TEM
10the single order Gaussian beam of pattern is as free space laser communication transmitting beam.The same with Gaussian beam, TEM
10single order Gaussian beam pattern is also the free space analytic solutions of Maxwell equation, also can in air, propagate, and propagation law and Gaussian beam are similar.
TEM
10the single order Gaussian beam light distribution of pattern is shown below:
W(z) represent equally the waist radius at z place here.Analyze TEM
10the surface of intensity distribution at concrete a certain section of the single order Gaussian beam of pattern, can know, there is a hollow circular hot spot at the center of light distribution, and this part light intensity is almost nil, and the light intensity beyond this circular light spot is stronger.Namely, this light beam is highly suitable for reflective optic antenna transmission, can solve autocollimator and block the problem of Gaussian beam.
Two optical modulators in Fig. 5 are all phase modulation types, and light beam is constant through rear light amplitude, and can make light intensity change mutually with position.Described the first optical modulator and the second optical modulator, concrete as spatial light modulator or phase-plate.Optical modulator 1 mainly completes light intensity in a certain plane thereafter and is distributed as hollow, and described a certain plane is a certain plane of vertical z axle; And optical modulator 2 mainly plays phase compensation effect, make particularly equipotential practise physiognomy and be modulated to a plane, can ensure that like this outgoing beam not only meets TEM in light distribution
10pattern requirement, and position mutually distribute also meet the demands, can ensure light beam Free propagation great distances in air.
The first optical modulator with in the second optical modulator, input certain position value mutually, can make laser beam form TEM after the first optical modulator and the second optical modulator
10the single order Gaussian beam of pattern; The position of input mutually value can adopt existing Phase Restoration algorithm (specific algorithm process for example can refer to document: Cong W X, Chen N X, Gu B Y. " Beam shaping and its solution with the use of an optimization method ", Appl.Opt., 1998, Vol.37, Page:4500-4503.) calculate.Phase Restoration algorithm is the existing position algorithm of value mutually that calculates, and specifically comprises G-S algorithm, Y-G algorithm etc., exceeds and repeats here.
Adopt the transceiver structure shown in Fig. 5, the fundamental-mode gaussian beam that light source laser sends, after the first optical modulator and the second light modulator modulates, becomes TEM
10the single order Gaussian beam of pattern, this light beam sees through beam splitter and projects on optical antenna secondary mirror, because this light beam mid portion energy is almost nil, so it is almost nil to be reflected again the light energy through primary mirror perforate by secondary mirror, be close to whole light and reflexed to primary mirror by secondary mirror, after primary mirror reflection, become collimated light beam outgoing again, optical antenna just completes emission process in the situation that not losing light energy like this.At receiving terminal, because the light beam transmitting is still TEM
10the single order Gaussian beam of pattern, through the each light beam parameters of choose reasonable, the intimate energy of light that can ensure dotted portion is as shown in Figure 4 zero, and all light energies are all in solid line light region, through optical antenna primary mirror and secondary mirror reflection, again through beam splitter reflect focalization to detector, complete receiving course.Like this, adopt the laser space communication system shown in Fig. 5, the Problem of Shading that transmits and receives optical antenna in process can be resolved.
Referring to Fig. 6, be the indicative flowchart of wireless laser communication transmission method of the present invention, it comprises the following steps:
Step 601, the first optical modulator carries out intensity modulation to the laser beam from light source laser, is modulated into the laser beam of light intensity hollow, is transferred to the second optical modulator.
Step 602, the second optical modulator, to the modulation mutually of the position of the laser signal from the first optical modulator, is practised physiognomy equipotential to be modulated to a plane, and the laser beam after modulation is transferred to beam splitter.
Step 603, beam splitter will be transparent to secondary mirror from the laser beam of the second optical modulator.
Step 604, the laser beam from beam splitter is reflexed to primary mirror by secondary mirror.
Step 605, primary mirror is launched after reflecting from the laser beam of secondary mirror.
Preferably, the method also further comprises:
Primary mirror receives the laser beam of the light intensity hollow of space transmission, reflexes to secondary mirror;
Secondary mirror receives the laser beam from primary mirror, after reflecting, is transferred to beam splitter;
Beam splitter receives the laser beam from secondary mirror, after reflecting, is transmitted into detector;
Detector receives the laser beam from beam splitter, converts the signal of telecommunication to.
Adopt the present invention program, can improve the efficiency that transmits and receives of reflective optic antenna in free space laser communication system, increase free space laser communication distance and also improve communication quality.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any amendment of making, be equal to replacement, improvement etc., within all should being included in the scope of protection of the invention.
Claims (8)
1. a wireless laser communication transmission system, this system comprises light source laser, secondary mirror and primary mirror, it is characterized in that, this system also sets gradually the first optical modulator, the second optical modulator and beam splitter between light source laser and secondary mirror;
Described the first optical modulator, carries out intensity modulation to the laser beam from light source laser, is modulated into the laser beam of light intensity hollow, is transferred to described the second optical modulator;
Described the second optical modulator, carries out position to the laser beam from described the first optical modulator and modulates mutually, and equipotential is practised physiognomy and is modulated to a plane, and the laser beam after modulation is transferred to described beam splitter;
Described beam splitter, will be transparent to described secondary mirror from the laser beam of described the second optical modulator;
Described secondary mirror, will reflex to described primary mirror from the laser beam of described beam splitter;
Described primary mirror is launched after reflecting from the laser beam of described secondary mirror.
2. the system as claimed in claim 1, is characterized in that, this system also comprises detector;
Described primary mirror, the laser beam of the light intensity hollow of reception space transmission, reflexes to described secondary mirror;
Described secondary mirror, receives the laser beam from described primary mirror, is transferred to described beam splitter after reflecting;
Described beam splitter, receives the laser beam from described secondary mirror, is transmitted into described detector after reflecting;
Described detector, receives the laser beam from described beam splitter, converts the signal of telecommunication to.
3. the system as claimed in claim 1, is characterized in that, the laser beam of described the second optical modulator output is TEM
10the single order Gaussian beam of pattern.
4. the system as described in claim 1,2 or 3, is characterized in that, described the first optical modulator and the second optical modulator are all spatial light modulator or phase-plate.
5. carry out a wireless laser communication transmission method based on claim 1 system, it is characterized in that, the method comprises:
The first optical modulator carries out intensity modulation to the laser beam from light source laser, is modulated into the laser beam of light intensity hollow, is transferred to the second optical modulator;
The second optical modulator, to the modulation mutually of the position of the laser signal from the first optical modulator, is practised physiognomy equipotential to be modulated to a plane, and the laser beam after modulation is transferred to beam splitter;
Beam splitter will be transparent to secondary mirror from the laser beam of the second optical modulator;
The laser beam from beam splitter is reflexed to primary mirror by secondary mirror;
Primary mirror is launched after reflecting from the laser beam of secondary mirror.
6. method as claimed in claim 5, is characterized in that, the method also comprises:
Primary mirror receives the laser beam of the light intensity hollow of space transmission, reflexes to secondary mirror;
Secondary mirror receives the laser beam from primary mirror, after reflecting, is transferred to beam splitter;
Beam splitter receives the laser beam from secondary mirror, after reflecting, is transmitted into detector;
Detector receives the laser beam from beam splitter, converts the signal of telecommunication to.
7. method as claimed in claim 6, is characterized in that, the laser beam that the second optical modulator is transferred to beam splitter is the single order Gaussian beam of TEM10 pattern.
8. the method as described in claim 5,6 or 7, is characterized in that, described the first optical modulator and the second optical modulator are all spatial light modulator or phase-plate.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526820A (en) * | 2016-11-07 | 2017-03-22 | 长春理工大学 | High emission efficiency space laser communication antenna based on aspheric shaping prism |
| CN107561649A (en) * | 2017-10-10 | 2018-01-09 | 长春长光博迅光电科技有限公司 | Light wavelength-multiplexing systems based on LCD space light modulator |
| CN107577028A (en) * | 2017-09-20 | 2018-01-12 | 长春理工大学 | A kind of multi-purpose laser communication optics antenna system |
| CN111277334A (en) * | 2020-01-20 | 2020-06-12 | 中国科学院上海光学精密机械研究所 | Large-aperture array type multidimensional optical phased array communication system |
| CN114384705A (en) * | 2022-01-13 | 2022-04-22 | 北京工业大学 | Super-large-area coaxial laser coherent array light source self-beam-expanding focusing system and preparation method |
| WO2023231504A1 (en) * | 2022-05-31 | 2023-12-07 | 华为技术有限公司 | Optical atp antenna and optical signal processing method |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106526820A (en) * | 2016-11-07 | 2017-03-22 | 长春理工大学 | High emission efficiency space laser communication antenna based on aspheric shaping prism |
| CN107577028A (en) * | 2017-09-20 | 2018-01-12 | 长春理工大学 | A kind of multi-purpose laser communication optics antenna system |
| CN107577028B (en) * | 2017-09-20 | 2020-03-24 | 长春理工大学 | Multipurpose laser communication optical antenna system |
| CN107561649A (en) * | 2017-10-10 | 2018-01-09 | 长春长光博迅光电科技有限公司 | Light wavelength-multiplexing systems based on LCD space light modulator |
| CN107561649B (en) * | 2017-10-10 | 2020-08-21 | 吉林珩辉光电科技有限公司 | Light wavelength division multiplexing system based on liquid crystal spatial light modulator |
| CN111277334A (en) * | 2020-01-20 | 2020-06-12 | 中国科学院上海光学精密机械研究所 | Large-aperture array type multidimensional optical phased array communication system |
| CN111277334B (en) * | 2020-01-20 | 2022-09-02 | 中国科学院上海光学精密机械研究所 | Large-aperture array type multidimensional optical phased array communication system |
| CN114384705A (en) * | 2022-01-13 | 2022-04-22 | 北京工业大学 | Super-large-area coaxial laser coherent array light source self-beam-expanding focusing system and preparation method |
| WO2023231504A1 (en) * | 2022-05-31 | 2023-12-07 | 华为技术有限公司 | Optical atp antenna and optical signal processing method |
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Application publication date: 20141015 |