CN114826414A - Wide-range non-mechanical scanning phased array laser communication transmitting device - Google Patents
Wide-range non-mechanical scanning phased array laser communication transmitting device Download PDFInfo
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- CN114826414A CN114826414A CN202210473552.9A CN202210473552A CN114826414A CN 114826414 A CN114826414 A CN 114826414A CN 202210473552 A CN202210473552 A CN 202210473552A CN 114826414 A CN114826414 A CN 114826414A
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- laser
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- phased array
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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
- H04B10/548—Phase or frequency modulation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention belongs to the technical field of laser communication, and particularly relates to a large-range non-mechanical scanning phased array laser communication transmitting device which comprises a plurality of phased array laser communication transmitting sub-devices which are circumferentially distributed on the same horizontal plane around a preset axis, wherein each laser communication transmitting sub-device comprises a laser communication transmitter, an optical fiber coupler, an optical waveguide phased array, an optical waveguide phase shifter, a liquid crystal spatial light modulator and a liquid crystal polarization grating; the optical waveguide phase shifter adjusts the phase difference of laser signals entering the optical waveguide phased array to obtain a laser primary adjustment signal; the liquid crystal spatial light modulator obtains the phase difference of the laser final adjusting signal by adjusting the refractive index change of the liquid crystal layer; the liquid crystal polarization grating conducts large-range discrete sectional pointing on the laser final adjusting signal. The invention avoids the influence of wavelength tuning on a laser communication system and realizes 360-degree full-cycle laser communication non-mechanical servo networking.
Description
Technical Field
The invention belongs to the technical field of laser communication, and particularly relates to a large-range non-mechanical scanning phased array laser communication transmitting device.
Background
The existing space laser communication, the executing mechanism for controlling the light beam aiming and tracking is mostly the application of the precise tracking vibrating mirror combination consisting of a servo turntable formed by a motor encoder bearing and a piezoelectric plate, at present, the structure of the precise tracking vibrating mirror combination consisting of the servo turntable formed by the motor encoder bearing and the piezoelectric plate has more mechanical moving parts, lower reliability, large mechanical time constant, large inertia and low servo bandwidth, and a single set of actuator can only realize point-to-point laser communication and is not beneficial to networking.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the existing laser communication can only realize point-to-point communication, and the communication range is small.
The technical scheme adopted by the invention for solving the technical problems is as follows: a wide-range non-mechanical scanning phased array laser communication transmitting device, comprising: the system comprises a plurality of phased array laser communication transmitting sub-devices which are circumferentially arranged around a preset axis on the same horizontal plane, wherein each laser communication transmitting sub-device comprises a laser communication transmitter, an optical fiber coupler, an optical waveguide phased array, an optical waveguide phase shifter, a liquid crystal spatial light modulator and a liquid crystal polarization grating;
the laser communication transmitter transmits laser signals to enter the optical waveguide phased array through the optical fiber coupler;
the optical waveguide phase shifter adjusts the phase difference of the laser signals entering the optical waveguide phased array to obtain a laser primary adjustment signal;
the optical waveguide phased array transmits the adjusted laser primary adjustment signal to the liquid crystal spatial light modulator;
the liquid crystal spatial light modulator changes the phase difference of the laser initial adjustment signal by adjusting the refractive index of the liquid crystal layer to obtain a laser final adjustment signal and sends the laser final adjustment signal to the liquid crystal polarization grating;
the liquid crystal polarization grating conducts large-range discrete sectional pointing on the laser final adjusting signal.
Further, the number of the laser communication transmitting sub-devices is three.
Further, the laser communication transmitter transmits a 10Gbps laser signal.
Furthermore, the optical waveguide phase shifter adjusts the phase difference of the laser signals to be in a horizontal azimuth angle range of-60 degrees to 60 degrees.
Furthermore, the spatial light modulator controls the pitching azimuth angle of the phase difference of the laser signal by adjusting the refractive index of the liquid crystal layer, and the range of the phase difference is-2.5 to 2.5 degrees of the pitching azimuth angle.
Furthermore, the liquid crystal polarization grating adopts four-level liquid crystal polarization grating cascade connection.
Furthermore, the liquid crystal polarization grating conducts discrete sectional pointing of a pitching azimuth angle on the laser signal of the spatial light modulator, and the ranges of the pitching azimuth angle are respectively 0 degree, -2.5 degrees to 2.5 degrees, -5 degrees to 5 degrees, -7.5 degrees to 7.5 degrees and-10 degrees.
The invention has the beneficial effects that: the invention relates to a large-range non-mechanical scanning phased array laser communication transmitting device which comprises a plurality of phased array laser communication transmitting sub-devices which are circumferentially distributed on the same horizontal plane around a preset axis, wherein firstly, a laser signal transmitted by a laser communication transmitter enters an optical waveguide phased array through an optical fiber coupler; then the optical waveguide phase shifter adjusts the phase difference of the laser signals entering the optical waveguide phased array to obtain primary laser adjusting signals, and the optical waveguide phased array transmits the adjusted primary laser adjusting signals to the liquid crystal spatial light modulator; the liquid crystal spatial light modulator changes the phase difference of the laser signal by adjusting the refractive index of the liquid crystal layer to obtain a laser final adjusting signal and sends the laser final adjusting signal to the liquid crystal polarization grating; and finally, carrying out large-range discrete segmented pointing on the laser final adjustment signal by the liquid crystal polarization grating. The range of a laser signal on a pitching azimuth axis is enlarged by adopting the liquid crystal spatial light modulator and the liquid crystal polarization grating, the influence of wavelength tuning on a laser communication system is avoided, 360-degree full-period laser communication non-mechanical servo networking can be realized by splicing a plurality of phased array laser communication transmitting sub-devices, and then laser communication from one place to a plurality of places is achieved.
Drawings
The invention is further illustrated by the following figures and examples.
FIG. 1 is a schematic structural diagram of a wide-range non-mechanical scanning phased array laser communication transmitting device according to the present invention;
FIG. 2 is a schematic diagram of the structure of the phased array laser communication transmitting sub-apparatus of FIG. 1;
fig. 3 is a block diagram of the phased array laser communication transmitting sub-assembly of fig. 1.
Detailed Description
To make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention relates to a large-range non-mechanical scanning phased array laser communication transmitting device, which in the embodiment comprises a plurality of phased array laser communication transmitting sub-devices which are circumferentially arranged around a preset axis on the same horizontal plane. Each laser communication transmitting sub-device comprises a laser communication transmitter, an optical fiber coupler, an optical waveguide phased array, an optical waveguide phase shifter, a liquid crystal spatial light modulator and a liquid crystal polarization grating. The laser communication transmitter transmits laser signals to enter the optical waveguide phased array through the optical fiber coupler; the optical waveguide phase shifter adjusts the phase difference of the laser signals entering the optical waveguide phased array to obtain a laser primary adjustment signal; the optical waveguide phased array transmits the adjusted laser primary adjustment signal to the liquid crystal spatial light modulator; the liquid crystal spatial light modulator changes the phase difference of the laser initial adjustment signal by adjusting the refractive index of the liquid crystal layer to obtain a laser final adjustment signal and sends the laser final adjustment signal to the liquid crystal polarization grating; and the liquid crystal polarization grating performs large-range discrete segmented pointing on the laser final adjustment signal.
Firstly, laser signals transmitted by a laser communication transmitter 11 enter an optical waveguide phased array 13 through an optical fiber coupler 12; then the optical waveguide phase shifter 14 adjusts the phase difference of the laser signals entering the optical waveguide phased array 13 to obtain a laser primary adjustment signal; the optical waveguide phased array 13 transmits the adjusted laser primary adjustment signal to the liquid crystal spatial light modulator 15; the liquid crystal spatial light modulator 15 changes the phase difference of the laser initial adjustment signal by adjusting the refractive index of the liquid crystal layer to obtain a laser final adjustment signal, and sends the laser final adjustment signal to the liquid crystal polarization grating 16; finally, the liquid crystal polarization grating 16 performs large-range discrete segmented pointing on the laser final adjustment signal. The liquid crystal spatial light modulator 15 and the liquid crystal polarization grating 16 are adopted to enlarge the range of the laser signal on the pitching azimuth axis, the influence of wavelength tuning on a laser communication system is avoided, and 360-degree full-circle laser communication non-mechanical servo networking can be realized by splicing a plurality of phased array laser communication transmitting sub-devices, so that laser communication from one place to a plurality of places is achieved.
The following describes in detail implementation details of the wide-range non-mechanical scanning phased array laser communication transmitting device according to the present embodiment, and the following description is provided only for the sake of understanding and is not necessary to implement the present embodiment.
A large-range non-mechanical scanning phased array laser communication transmitting device comprises a plurality of phased array laser communication transmitting sub-devices which are circumferentially arranged around a preset axis on the same horizontal plane.
Specifically, a central axis is preset, a circle center is selected on the central axis as an axis, a horizontal plane where the axis is located is a working horizontal plane, and all phased array laser communication transmitting sub-devices are circumferentially and uniformly distributed on the working horizontal plane by taking the axis as a center.
For example, a large-area non-mechanically scanned phased array laser communication transmitter is shown in fig. 1. The number of the phased array laser communication transmitting sub-devices is three, the three phased array laser communication transmitting sub-devices are located on the same horizontal plane and are evenly distributed around a preset axis as the center respectively, the horizontal positions of the three phased array laser communication transmitting sub-devices are used as the horizontal positions, and the vertical positions of the three phased array laser communication transmitting sub-devices are used as the pitching positions.
As shown in fig. 2 and 3, each laser communication transmitting sub-device includes a laser communication transmitter 11, an optical fiber coupler 12, an optical waveguide phased array 13, an optical waveguide phase shifter 14, a liquid crystal spatial light modulator 15 and a liquid crystal polarization grating 16, first, a laser signal transmitted by the laser communication transmitter 11 enters the optical waveguide phased array 13 through the optical fiber coupler 12; then the optical waveguide phase shifter 14 adjusts the phase difference of the laser signals entering the optical waveguide phased array 13 to obtain a laser primary adjustment signal; the optical waveguide phased array 13 transmits the adjusted laser primary adjustment signal to the liquid crystal spatial light modulator 15; the liquid crystal spatial light modulator 15 changes the phase difference of the laser signal by adjusting the refractive index of the liquid crystal layer to obtain a laser final adjustment signal, and sends the laser final adjustment signal to the liquid crystal polarization grating 16; finally, the liquid crystal polarization grating 16 performs large-range discrete segmented pointing on the laser final adjustment signal. The liquid crystal spatial light modulator 15 and the liquid crystal polarization grating 16 are adopted to enlarge the range of the laser signal in the pitching azimuth angle, and the influence of wavelength tuning on a laser communication system is avoided.
Step 1.1, the laser signal emitted by the laser communication transmitter 11 enters the optical waveguide phased array 13 through the optical fiber coupler 12.
Specifically, a laser communication transmitter 11 with the model number of kintex-7 development board XC7K325T is adopted to transmit 10Gbps laser communication signals to an optical fiber coupler 12 integrated on a chip of an optical waveguide phased array 13, and the laser signals are coupled through the optical fiber coupler 12 and enter the optical waveguide phased array 13.
Step 1.2, the optical waveguide phase shifter 14 adjusts the phase difference of the laser signals entering the optical waveguide phased array 13 to obtain a primary laser adjustment signal, and the optical waveguide phased array 13 transmits the adjusted primary laser adjustment signal to the liquid crystal spatial light modulator 15.
Specifically, the optical waveguide shifter is integrated on a phased array chip, the optical waveguide phase shifter 14 controls the optical waveguide phased array 13 chip to control the direction of the laser signal, the optical waveguide phase shifter 14 adjusts the phase difference range of the laser signal to be horizontal azimuth angle-60 degrees to obtain a laser primary adjustment signal, and the optical waveguide phased array 13 transmits the adjusted laser primary adjustment signal to the liquid crystal spatial light modulator 15.
Step 1.3, the liquid crystal spatial light modulator 15 changes the phase difference of the laser signal by adjusting the refractive index of the liquid crystal layer to obtain a laser final adjustment signal, and sends the laser final adjustment signal to the liquid crystal polarization grating 16.
Specifically, the types of the liquid crystal spatial light modulator 15 used are: the Meadown Optical-User Manual 1x12K Linear Array Light Modulator With 16-bit PCIeController, the rotation axis of the liquid crystal Spatial Light Modulator 15 is perpendicular to the rotation axis of the Optical waveguide phased Array 13, the liquid crystal Spatial Light Modulator 15 controls the refractive index of the liquid crystal layer by an external electric field based on the Optical phased Array technology, so that the liquid crystal layers at different positions have different refractive indexes, a certain phase difference can be formed between different positions of the liquid crystal layer, the phase distribution at the whole position of the liquid crystal layer is in a periodic grating structure-like appearance through proper electric field adjustment, namely, the phase depth appearance of the grating structure-like appearance is formed by using liquid crystal, when the laser primary adjustment signal is incident on the grating phase surface of the liquid crystal layer, the laser primary adjustment signal can be deflected, the liquid crystal layer can realize different phase depth appearances through the modulation of different electric fields, the laser primary adjustment signal realizes deflection of different angles. The liquid crystal spatial light modulator 15 changes the refractive index of liquid crystal by adopting an electro-optic effect, realizes high-precision deflection of laser signals, controls the pitching azimuth angle of the phase difference of the laser signals by adjusting the refractive index of the liquid crystal layer, controls the pitching azimuth angle within the range of-2.5 degrees of the pitching azimuth angle, and then sends a deflected laser final adjustment signal to the liquid crystal polarization grating 16.
Step 1.4, the liquid crystal polarization grating 16 performs large-range discrete sectional pointing on the laser final adjustment signal.
Specifically, the type of the adopted liquid crystal polarization grating 16 is transmission type liquid crystal polarization grating 16BNS-1550nm, a rotating shaft of the liquid crystal light modulator is parallel to the rotating shaft of the liquid crystal polarization grating 16, the liquid crystal polarization grating 16 diffracts circular deflection light to +1 level or-1 level based on controlling the polarization of incident light, the polarization is controlled by integrating a rapid electro-optical half-wave polarization retarder, compared with a mechanical deflection device, the liquid crystal polarization grating 16 has smaller volume, light weight and low power consumption, the number of stages of the liquid crystal polarization grating 16 determines the number of stages of deflection angles, the four-stage liquid crystal polarization grating 16 is adopted for cascading, the laser final adjustment signal of the spatial light modulator 15 is subjected to discrete sectional pointing of a pitching azimuth angle, and the ranges of the pitching azimuth angle are respectively 0 degree, -2.5 degrees, -5 degrees, -7.5 degrees, -10 to 10 °.
It should be noted that each module referred to in this embodiment is a logical module, and in practical applications, one logical unit may be one physical unit, may be a part of one physical unit, and may be implemented by a combination of multiple physical units. In addition, in order to highlight the innovative part of the present invention, elements that are not so closely related to solving the technical problems proposed by the present invention are not introduced in the present embodiment, but this does not indicate that other elements are not present in the present embodiment.
In light of the foregoing description of preferred embodiments in accordance with the invention, it is to be understood that numerous changes and modifications may be made by those skilled in the art without departing from the scope of the invention. The technical scope of the present invention is not limited to the contents of the specification, and must be determined according to the scope of the claims.
Claims (7)
1. A wide-range non-mechanical scanning phased array laser communication transmitting device is characterized by comprising: the system comprises a plurality of phased array laser communication transmitting sub-devices which are circumferentially arranged around a preset axis on the same horizontal plane, wherein each laser communication transmitting sub-device comprises a laser communication transmitter, an optical fiber coupler, an optical waveguide phased array, an optical waveguide phase shifter, a liquid crystal spatial light modulator and a liquid crystal polarization grating;
the laser communication transmitter transmits laser signals to enter the optical waveguide phased array through the optical fiber coupler;
the optical waveguide phase shifter adjusts the phase difference of the laser signals entering the optical waveguide phased array to obtain a laser primary adjustment signal;
the optical waveguide phased array transmits the adjusted laser primary adjustment signal to the liquid crystal spatial light modulator;
the liquid crystal spatial light modulator changes the phase difference of the laser initial adjustment signal by adjusting the refractive index of the liquid crystal layer to obtain a laser final adjustment signal and sends the laser final adjustment signal to the liquid crystal polarization grating;
and the liquid crystal polarization grating performs large-range discrete segmented pointing on the laser final adjustment signal.
2. The large-scale non-mechanical scanning phased array laser communication transmitting device as claimed in claim 1, wherein said number of said laser communication transmitting sub-devices is three.
3. The extended range non-mechanical scanning phased array laser communication transmitting device of claim 1, wherein the laser communication transmitter transmits 10Gbps laser signals.
4. The device for wide-range non-mechanical scanning phased array laser communication transmission as claimed in claim 1, wherein said optical waveguide phase shifter adjusts the phase difference of the laser signals to be in the range of horizontal azimuth angle-60 ° to 60 °.
5. The wide range non-mechanical scanning phased array laser communication transmitter as claimed in claim 1, wherein said spatial light modulator controls the elevation angle of the phase difference of the laser signal by adjusting the refractive index of the liquid crystal layer, the phase difference being in the range of-2.5 ° to 2.5 ° in elevation angle.
6. The wide range non-mechanical scanning phased array laser communication transmitter as claimed in claim 1, wherein said liquid crystal polarization grating is a four-stage liquid crystal polarization grating cascade.
7. The wide range non-mechanical scanning phased array laser communication transmitter as claimed in claim 6, wherein said liquid crystal polarization grating performs discrete segmented pointing of elevation azimuth angle of laser signal of said spatial light modulator, the range of elevation azimuth angle is 0 °, -2.5 °, -5 °, -7.5 ° -10 °.
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