CN104158592B - Partially coherent optic communication primary light source parameter controller in turbulent atmosphere - Google Patents
Partially coherent optic communication primary light source parameter controller in turbulent atmosphere Download PDFInfo
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Abstract
The present invention provides partially coherent optic communication primary light source parameter controller in a kind of turbulent atmosphere, is made of signal transmitter unit and signal receiving unit two parts；Signal transmitter unit is made of the laser of arranged in co-axial alignment, laser modulator, LCD space light modulator, optical transmitting system and adjustable diaphragm, signal generator is linked by the BNC mouth of BNC mouthfuls and laser modulator, LCD space light modulator drive module is linked with LCD space light modulator by winding displacement, and control computer and LCD space light modulator drive module are electrically connected.The present invention can measure Refractive-index-structure parameter, and the Spatially coherent length of optimal transmitting light beam initial waist width and light beam is calculated by computer.It applies the invention in the long range atmospheric channel radio telecommunicaltion system of Near Ground, the performance of communication system, the application range of extended wireless laser communication system can be substantially improved.
Description
Technical Field
The invention belongs to the technical field of atmospheric channel wireless laser communication, and relates to a parameter control device for a partial coherent light communication initial light source in turbulent atmosphere.
Background
Wireless Optical Communication (also called Free-space Optical Communication (FSO) for short) is a product combining Optical fiber Communication and Wireless Communication, and uses laser as a carrier to transmit laser signals in the atmosphere to realize point-to-point, point-to-multipoint or multipoint-to-multipoint bidirectional Communication of voice, data and image information. The atmospheric channel wireless laser communication technology has wide application prospect in the fields of 'last mile' access, local area/metropolitan area network expansion, emergency command communication, rapid communication networking and the like, and is a research hotspot in the current communication field. When laser is transmitted in the atmosphere, the refractive index fluctuation caused by the atmospheric turbulence can cause the distortion of the laser wave front and destroy the coherence of the laser, thereby seriously weakening the beam quality of the laser, causing the random drift of the beam, the redistribution of the laser energy on the beam section, generating phenomena such as expansion, distortion, fragmentation and the like, and when the laser power is large enough, generating the nonlinear thermal halo phenomenon. The turbulent flow field is formed by the random fluctuation of the refractive index of air caused by the influence of parameters such as temperature, air pressure, water vapor pressure and the like, so that the technical performance of a high-precision tracking and aiming system of a laser communication system is greatly reduced, a light spot on a target is enlarged for a strong laser system, and especially when the diameter of a light beam is equal to or larger than the size of turbulent flow, because a plurality of turbulent flow vortexes are contained in the cross section of the light beam, an expansion effect is generated when the transmitted light beam reaches a receiving end, aiming accuracy is influenced to generate aiming errors, the drift and expansion of the light beam can cause difficulty in aligning two communication ends, and the energy density on the receiving plane of the receiving end is reduced. The complete coherent light is limited in most practical applications because the rapid expansion of the complete coherent light is caused by atmospheric turbulence, and research results show that the light beam expansion caused by the atmospheric turbulence can be effectively reduced by using a partially coherent light transmission signal under certain conditions, and the performance of a communication link is improved.
When the partially coherent light is used for communication in turbulent atmosphere, the light power received by the receiving end is related to the initial beam waist radius, the spatial coherence length, the wavelength, the propagation distance and the turbulent intensity of the light beam, an optimal value exists, and the power loss caused by the atmospheric turbulence is reduced by reasonably controlling the initial parameters of the light source, so that the light power of the receiving end is increased.
The invention can effectively solve the problem of the receiving optical power fading caused by the atmosphere in the wireless laser communication.
Disclosure of Invention
The invention provides a turbulence atmosphere partial coherent optical communication initial light source parameter control device, which overcomes the influence of atmospheric turbulence on partial coherent optical communication, effectively controls initial parameters such as initial beam waist radius, spatial coherence length, wavelength and the like of a laser beam according to a transmission distance and turbulence intensity, reduces power loss caused by atmospheric turbulence, and increases optical power of a receiving end.
The invention discloses a device for controlling parameters of a partial coherent optical communication initial light source in turbulent atmosphere, which is characterized in that:
a turbulence atmosphere partial coherent optical communication initial light source parameter control device is characterized in that: the device consists of a signal transmitting unit and a signal receiving unit; wherein,
the signal transmitting unit consists of a laser, a laser modulator, a liquid crystal spatial light modulator, a transmitting optical system and an adjustable diaphragm which are coaxially arranged, the signal generator is connected with a BNC port of the laser modulator through a BNC port, a liquid crystal spatial light modulator driving module is connected with the liquid crystal spatial light modulator through a flat cable, and a control computer is electrically connected with the liquid crystal spatial light modulator driving module;
the signal receiving unit comprises a coaxially arranged receiving optical system, a beam splitter prism, a focusing lens group, a CCD detector, a non-coaxially arranged focusing lens group, an APD photoelectric detector and a computer; the CCD detector and the APD photoelectric detector store the collected electric signals into a computer; the computer calculates the optimal initial radius and spatial coherence length of the emitted light beam, the optimal parameters are fed back to the control computer of the emitting end through the data transmission station, the control computer generates a random phase screen control signal and outputs the random phase screen control signal to the liquid crystal spatial light modulator through the liquid crystal spatial light modulator driving module, and a random phase is added to the wave front of the emitted communication laser to realize the modulation of the spatial coherence; feeding back the received optimal initial beam waist width to the adjustable diaphragm, and adjusting the beam waist of the initial emission beam;
laser emitted by the laser enters the liquid crystal spatial light modulator through modulation of the modulator, becomes parallel light emission after passing through the emission optical system, adjusts the aperture of a light beam through the adjustable diaphragm, and is received by the signal receiving unit after being transmitted by atmosphere; firstly, beam shrinking is carried out through a receiving optical system, then beam splitting is carried out through a beam splitting prism, a beam of light is sent to a focusing lens group, and the light converted through the focusing lens group is incident on a CCD detector; one beam of light is sent to a focusing lens group, and the light converted by the focusing lens group is incident on an APD photoelectric detector; the CCD detector stores the acquired voltage value into a meter, and calculates the turbulence intensity at the moment, namely the atmospheric refractive index structural constant; the APD photoelectric detection sends the received signal to a data processing meter, and calculates the received optical power.
The laser emits laser, enters turbulent atmosphere after passing through a modulator, a liquid crystal spatial light modulator, an emitting optical system and an adjustable diaphragm (the modulation aperture of the adjustable diaphragm is maximum 20 cm), light beams passing through the turbulent atmosphere enter a receiving optical system, are received by a CCD detector after passing through a beam splitter prism and a focusing lens group, the CCD detector converts received light signals into electric signals, and then the electric signals are sent into a computer to be processed to obtain the normalized light intensity fluctuation variance of plane waves under the weak turbulent condition. Thereby, the structural function of the atmospheric refractive index can be reversely deduced。
The laser emits laser, enters turbulent atmosphere after passing through a modulator, a liquid crystal spatial light modulator, an emitting optical system and an adjustable diaphragm, the maximum modulation aperture of the adjustable diaphragm is 20cm, a light beam enters a receiving optical system, is received by an APD photoelectric detector after passing through a beam splitter prism and a focusing lens group, the APD photoelectric detector sends a received signal into a computer to calculate the received optical power, and according to the relationship between the optical power and the drift variance and the expansion angle in the atmospheric turbulence:
in the formula:for the optical power received at the receiving end,in order to be able to measure the variance of the beam drift,is the beam spread angle. Dependence of drift variance and spread angle on initial beam waist radius, spatial coherence length, wavelength, propagation distance, and turbulence intensity:
in the formula:as a function of the structure of the refractive index of the atmosphere,is the initial radius of the emitted light beam,is the distance of transmission of the signal,is the wave number of the light wave,is the wavelength of the laser light and is,is the beam spatial coherence length.
By intensity of turbulenceAnd distance of propagationThe optimal initial radius and the optimal spatial coherence length of the emitted light beam are calculated, the optimal parameters are fed back to a control computer 10 of an emitting end through a data transmission radio station, the control computer 10 generates a random phase screen control signal and outputs the random phase screen control signal to a liquid crystal spatial light modulator 5 through a liquid crystal spatial light modulator driving module 9, and a random phase is added to the wave front of the emitted communication laser so as to realize the modulation of the spatial coherence.
The control computer 10 feeds back the received optimum initial beam waist width to the adjustable diaphragm 7, and adjusts the beam waist of the initial emission beam.
The invention has the positive effects that: the atmospheric refractive index structure constant can be measured, and the optimal initial beam waist width of the emitted beam and the optimal spatial coherence length of the beam can be calculated by a computer. Controlling a liquid crystal spatial light modulator to adjust the wavefront phase so that the spatial coherence length reaches a calculated optimal value; the aperture of the adjustable diaphragm is adjusted to achieve the calculated optimal initial beam waist width, and the optical power loss caused by atmospheric turbulence is reduced, so that the received optical power is obviously improved. The invention is applied to a long-distance atmospheric channel wireless laser communication system near the ground, can greatly improve the performance of the communication system and expand the application range of the wireless laser communication system.
Drawings
FIG. 1 is a schematic block diagram of a device for controlling parameters of an initial light source for partially coherent optical communication in turbulent atmosphere;
in the figure, 1, a signal transmitting unit; 2. a signal receiving unit; 3. a laser; 4. a modulator; 5. a liquid crystal spatial light modulator; 6. an emission optical system; 7. an adjustable diaphragm; 8. a signal generator; 9. a liquid crystal spatial light modulator driving module; 10. a control computer; 11. a receiving optical system; 12. a beam splitter prism; 13. a focusing lens group; 14. A CCD detector 15 and a data processing computer; 16. a focusing lens group; 17. an APD photodetector.
Detailed Description
Example 1
Referring to fig. 1, the device for controlling initial light source parameters of partial coherent optical communication in turbulent atmosphere of the present invention is composed of a signal transmitting unit 1 and a signal receiving unit 2. The signal transmitting unit 1 is composed of a laser 3 (AFL-PM-1550-30-R-FA optical fiber laser manufactured by Zhiyun photoelectric company), a modulator 4 (EO-AM-NR-C1 variable rate laser modulator manufactured by Take company), a liquid crystal spatial light modulator 5 (XY series nematic liquid crystal spatial light modulator manufactured by BNS company), a transmitting optical system 6 (120 ED-APO card manufactured by Shy-Watcher company) and an adjustable diaphragm 7 which are coaxially arranged, a signal generator 8 is connected with a BNC port of the laser modulator 4 through the BNC port, a liquid crystal spatial light modulator driving module 9 is connected with the liquid crystal spatial light modulator 5 through a flat cable, and a control computer 10 is electrically connected with the liquid crystal spatial light modulator driving module 9. Laser emitted from the laser 3 is emitted in parallel after passing through the modulator 4, the liquid crystal spatial light modulator 5, the emission optical system 6 and the adjustable diaphragm 7; the signal receiving unit 2 includes a receiving optical system 11, a beam splitter prism 12 (PBS 254 of Thorlabs), a focusing lens group 13, and a CCD detector 14 (PR-1G-B of conguan photoelectric corporation) coaxially arranged, and further includes a focusing lens group 16 and a photodetector 17 (APD 310 of menlosys) optically linked to the beam splitter prism 12, and the CCD detector 14 and the APD photodetector 17 store the collected signals in a computer 15.
Test example 1
The laser 3 emits laser, and enters turbulent atmosphere after passing through the modulator 4, the liquid crystal spatial light modulator 5, the emission optical system 6 and the adjustable diaphragm 7. The signal passes through the atmospheric channel, enters the receiving optical system 11 for beam shrinking, the shrunk laser is transmitted through the beam splitter prism 12, the focused lens group 13 is received by the CCD detector 14, the CCD detector 14 converts the received optical signal into an electric signal, and the electric signal is sent into the data processing computer 15 for processing to obtain the normalized light intensity fluctuation variance of the plane wave under the weak turbulence condition。
The laser light reflected by the beam splitting prism 12 is received by the APD photodetector 17 after passing through the focusing lens group 16, and the APD photodetector 17 sends the received signal to the data processing computer 15 to calculate the received optical power. According to the relation between the optical power and the drift variance and angular spread in the atmospheric turbulence:
dependence of drift variance and spread angle on initial beam waist radius, spatial coherence length, wavelength, propagation distance, and turbulence intensity:
measured intensity of turbulenceAnd distance of propagationThe optimal initial radius and the optimal spatial coherence length of the emitted light beam are calculated, the optimal parameters are fed back to a control computer 10 of an emitting end through a data transmission radio station, the control computer 10 generates a random phase screen control signal and outputs the random phase screen control signal to a liquid crystal spatial light modulator 5 through a liquid crystal spatial light modulator driving module 9, and a random phase is added to the wave front of the emitted communication laser so as to realize the modulation of the spatial coherence.
The control computer 10 feeds back the received optimum initial beam waist width to the adjustable diaphragm 7, and adjusts the beam waist of the initial emission beam.
The whole system corrects the initial parameters of laser communication in the above mode, so that the received optical power is increased.
Claims (1)
1. A turbulence atmosphere partial coherent optical communication initial light source parameter control device is characterized in that: the device consists of a signal transmitting unit and a signal receiving unit; wherein,
the signal transmitting unit consists of a laser, a laser modulator, a liquid crystal spatial light modulator, a transmitting optical system and an adjustable diaphragm which are coaxially arranged, the signal generator is connected with a BNC port of the laser modulator through a BNC port, a liquid crystal spatial light modulator driving module is connected with the liquid crystal spatial light modulator through a flat cable, and a control computer is electrically connected with the liquid crystal spatial light modulator driving module;
the signal receiving unit comprises a coaxially arranged receiving optical system, a beam splitter prism, a focusing lens group, a CCD detector, a non-coaxially arranged focusing lens group, an APD photoelectric detector and a computer; the CCD detector and the APD photoelectric detector store the collected electric signals into a computer; the computer calculates the optimal initial radius and spatial coherence length of the emitted light beam, the optimal parameters are fed back to the control computer of the emitting end through the data transmission station, the control computer generates a random phase screen control signal and outputs the random phase screen control signal to the liquid crystal spatial light modulator through the liquid crystal spatial light modulator driving module, and a random phase is added to the wave front of the emitted communication laser to realize the modulation of the spatial coherence; feeding back the received optimal initial beam waist width to the adjustable diaphragm, and adjusting the beam waist of the initial emission beam;
laser emitted by the laser enters the liquid crystal spatial light modulator through modulation of the modulator, becomes parallel light emission after passing through the emission optical system, adjusts the aperture of a light beam through the adjustable diaphragm, and is received by the signal receiving unit after being transmitted by atmosphere; firstly, beam shrinking is carried out through a receiving optical system, then beam splitting is carried out through a beam splitting prism, a beam of light is sent to a focusing lens group, and the light converted through the focusing lens group is incident on a CCD detector; one beam of light is sent to a focusing lens group, and the light converted by the focusing lens group is incident on an APD photoelectric detector; the CCD detector stores the acquired voltage value into a meter, and calculates the turbulence intensity at the moment, namely the atmospheric refractive index structural constant; the APD photoelectric detection sends the received signal to a data processing meter, and calculates the received optical power;
the laser emits laser, enters turbulent atmosphere after passing through the modulator, the liquid crystal spatial light modulator, the emission optical system and the adjustable diaphragm, light beams passing through the turbulent atmosphere enter the receiving optical system, are received by the CCD detector after passing through the beam splitter prism and the focusing lens group, the CCD detector converts received optical signals into electric signals, and then the electric signals are sent into the computer to be processed and calculated to obtain turbulent intensity
The laser emits laser, the laser enters turbulent atmosphere after passing through a modulator, a liquid crystal spatial light modulator, an emitting optical system and an adjustable diaphragm, the modulation aperture of the adjustable diaphragm is at most 20cm, a light beam enters a receiving optical system, the light beam passes through a beam splitter prism and a focusing lens group and is received by an APD photoelectric detector, the APD photoelectric detector sends a received signal to a computer, the computer calculates the optimal initial radius and the spatial coherence length of the emitted light beam, the optimal parameter is fed back to a control computer at an emitting end through a data transmission radio station, the control computer generates a random phase screen control signal and outputs the random phase screen control signal to the liquid crystal spatial light modulator through a liquid crystal spatial light modulator driving module, and a random phase is added to the wave front of the emitted communication laser to realize the modulation of the spatial coherence; and the control computer feeds back the received optimal initial beam waist width to the adjustable diaphragm to adjust the beam waist of the initial emission beam.
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| CN105444991B (en) * | 2015-11-09 | 2018-05-11 | 长春理工大学 | Optical coupling efficiency test device in a kind of atmospheric turbulance |
| CN110224752A (en) * | 2018-03-01 | 2019-09-10 | 长春理工大学 | A kind of space optical communication network device based on region segmentation |
| WO2021019329A1 (en) * | 2019-07-31 | 2021-02-04 | State Scientific Institution B.I. Stepanov Institute Of Physics Of The National Academy Of Sciences Of The Republic Of Belarus | A system for free space laser communication |
| CN111355530B (en) * | 2020-03-13 | 2021-07-20 | 山东师范大学 | Method and device for improving performance of wireless optical communication system |
| CN113972948A (en) * | 2020-07-22 | 2022-01-25 | 华为技术有限公司 | Light emitting device, optical communication system and optical communication method |
| CN117220775B (en) * | 2023-11-07 | 2024-02-02 | 长春理工大学 | Multipath laser communication device, system, method and electronic equipment |
| CN117572677B (en) * | 2023-12-29 | 2024-07-23 | 剑芯光电(苏州)有限公司 | System and method for testing dynamic reflectivity of liquid crystal device |
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| CN200965571Y (en) * | 2006-10-27 | 2007-10-24 | 中国科学院武汉物理与数学研究所 | A laser radar for detecting the air refractive index structure constant Cn2 profile |
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| CN1587933A (en) * | 2004-08-27 | 2005-03-02 | 中国科学院上海光学精密机械研究所 | Femtosecond laser space coherence testing device |
| CN200965571Y (en) * | 2006-10-27 | 2007-10-24 | 中国科学院武汉物理与数学研究所 | A laser radar for detecting the air refractive index structure constant Cn2 profile |
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