CN114839647A - Pulse coherent wind lidar system - Google Patents
Pulse coherent wind lidar system Download PDFInfo
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- CN114839647A CN114839647A CN202210776308.XA CN202210776308A CN114839647A CN 114839647 A CN114839647 A CN 114839647A CN 202210776308 A CN202210776308 A CN 202210776308A CN 114839647 A CN114839647 A CN 114839647A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/95—Lidar systems specially adapted for specific applications for meteorological use
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S7/00—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00
- G01S7/48—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00
- G01S7/4802—Details of systems according to groups G01S13/00, G01S15/00, G01S17/00 of systems according to group G01S17/00 using analysis of echo signal for target characterisation; Target signature; Target cross-section
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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
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
- Y02A90/10—Information and communication technologies [ICT] supporting adaptation to climate change, e.g. for weather forecasting or climate simulation
Abstract
The application relates to the technical field of laser radars, and discloses a pulse coherent wind lidar system, includes: the light source module is used for transmitting local oscillation continuous laser; the light splitting module is used for splitting light, wherein the first part of light enters the frequency shift module, and the second part of light enters the frequency mixing module; the frequency shift module is used for carrying out frequency shift, modulation and amplification processing on the first part of light to obtain pulse laser; the multimode circulator is used for transmitting the pulse laser into the telescope, receiving an echo signal transmitted back by the telescope and transmitting the echo signal into the optical amplifier; the optical amplifier is used for amplifying the echo signal; the frequency mixing module is used for coupling and frequency mixing the amplified echo signal and the second part of light; and the detection module is used for performing signal conversion and data processing on the mixed optical signal. Therefore, the multi-mode circulator can be used for expanding the optical receiving field angle, improving the optical receiving efficiency, realizing the amplification of the whole signal intensity by using the optical amplifier and improving the signal-to-noise ratio and the detection distance of the system.
Description
Technical Field
The invention relates to the technical field of laser radars, in particular to a pulse coherent wind lidar system.
Background
The atmospheric wind field is the main power for the circulation of substances such as moisture, aerosol and the like in the atmosphere, and has very important research values in the researches of weather forecast, the earth environment, dynamic meteorology and the like. The coherent wind measurement is realized by coherently mixing an atmospheric laser echo signal and local oscillator laser. The coherent Doppler wind lidar can realize the measurement of radial wind speed by detecting the Doppler frequency shift of the laser echo signal.
At present, a coherent doppler wind lidar system generally uses a single-mode fiber circulator to transmit and receive optical signals, so as to implement an integrated optical structure for transmitting and receiving. However, the diameter of the core of the single-mode fiber is generally about 9um, and the numerical aperture NA is 0.11, which results in a small receiving field angle, low optical receiving efficiency, low coupling efficiency with the telescope, and the theoretical highest coupling efficiency of 81.45%, the efficiency in the actual process will be lower, and the signal-to-noise ratio and the measurement distance of the system will be reduced.
Therefore, how to solve the problems of low coupling efficiency, low signal-to-noise ratio and short measurement distance of the conventional coherent wind lidar system is a technical problem to be solved urgently by the technical personnel in the field.
Disclosure of Invention
In view of this, the present invention provides a pulse coherent wind lidar system, which can expand an optical receiving field angle, improve optical efficiency, and simultaneously improve a signal-to-noise ratio and a detection distance of the system. The specific scheme is as follows:
a pulsed coherent wind lidar system comprising: the device comprises a light source module, a light splitting module, a frequency shifting module, a frequency mixing module, a multi-mode circulator, a telescope connected with a first end of the multi-mode circulator, an optical amplifier connected with a second end of the multi-mode circulator and a detection module; wherein the content of the first and second substances,
the light source module is used for emitting local oscillation continuous laser;
the optical splitting module is used for splitting the local oscillation continuous laser into two parts of light, wherein the first part of light enters the frequency shift module, and the second part of light enters the frequency mixing module;
the frequency shift module is used for carrying out frequency shift, modulation and amplification processing on the first part of light and transmitting the processed pulse laser into the multimode circulator;
the multimode circulator is used for transmitting the received pulse laser into the telescope, receiving an echo signal transmitted back by the telescope and transmitting the echo signal into the optical amplifier;
the optical amplifier is used for amplifying the echo signal and transmitting the echo signal to the frequency mixing module;
the frequency mixing module is configured to perform coupling frequency mixing processing on the amplified echo signal and the second portion of light, and transmit a frequency-mixed optical signal to the detection module;
and the detection module is used for performing signal conversion and data processing on the optical signals after frequency mixing.
Preferably, in the above pulsed coherent wind lidar system provided in an embodiment of the present invention, the frequency shift module includes:
the acousto-optic modulator is used for completing frequency shift of the first part of light and modulating the continuous laser after frequency shift into pulse laser;
and the first amplifier is used for amplifying the optical signal of the modulated pulse laser to obtain amplified pulse laser and transmitting the amplified pulse laser into the multimode circulator.
Preferably, in the pulse coherent wind lidar system provided by the embodiment of the present invention, an input end of the multimode circulator is connected to an output end of the first amplifier;
the input end of the multimode circulator is used for receiving pulse laser and transmitting the pulse laser to the first end of the multimode circulator;
the first end of the multimode circulator is used for emitting the received pulse laser to the telescope so that the telescope can emit the pulse laser to the atmosphere in a collimation manner to generate the echo signal, and the first end of the multimode circulator is also used for receiving the echo signal returned by the telescope and transmitting the echo signal into the second end of the multimode circulator;
a second end of the multi-mode circulator for exiting the echo signal to the optical amplifier.
Preferably, in the pulsed coherent wind lidar system provided in an embodiment of the present invention, the frequency mixing module includes a 2 × 2 coupler; and the first end of the 2 x 2 coupler is connected with the optical splitting module, and the second end of the 2 x 2 coupler is connected with the optical amplifier.
Preferably, in the above pulsed coherent wind lidar system provided in an embodiment of the present invention, the detection module includes:
the balance detector is connected with the output end of the frequency mixing module and is used for converting the optical signals after frequency mixing into electric signals;
and the data acquisition card is used for carrying out data acquisition and data processing on the electric signals.
Preferably, in the pulse coherent wind lidar system provided by the embodiment of the present invention, the optical amplifier is an EDFA erbium-doped fiber amplifier.
Preferably, in the pulsed coherent wind lidar system according to an embodiment of the present invention, the 2 × 2 coupler is a multimode 2 × 2 coupler.
Preferably, in the pulse coherent wind lidar system provided by the embodiment of the present invention, the balanced detector is a PIN photodetector.
Preferably, in the pulse coherent wind lidar system according to an embodiment of the present invention, the beam splitting module is a beam splitter.
Preferably, in the pulse coherent wind lidar system provided by the embodiment of the present invention, the light source module is a seed laser.
It can be seen from the above technical solutions that, the pulse coherent wind lidar system provided by the present invention includes: the device comprises a light source module, a light splitting module, a frequency shifting module, a frequency mixing module, a multi-mode circulator, a telescope connected with a first end of the multi-mode circulator, an optical amplifier connected with a second end of the multi-mode circulator and a detection module; the light source module is used for emitting local oscillation continuous laser; the optical splitting module is used for splitting the local oscillation continuous laser into two parts of light, wherein the first part of light enters the frequency shifting module, and the second part of light enters the frequency mixing module; the frequency shifting module is used for carrying out frequency shifting, modulation and amplification processing on the first part of light and transmitting the processed pulse laser into the multimode circulator; the multimode circulator is used for transmitting the received pulse laser into the telescope, receiving an echo signal transmitted back by the telescope and transmitting the echo signal into the optical amplifier; the optical amplifier is used for amplifying the echo signal and transmitting the echo signal to the frequency mixing module; the frequency mixing module is used for coupling and frequency mixing the amplified echo signal and the second part of light and transmitting the frequency-mixed light signal to the detection module; and the detection module is used for performing signal conversion and data processing on the mixed optical signal.
According to the pulse coherent wind lidar system, atmospheric wind field measurement can be achieved through interaction of the light source module, the light splitting module, the frequency shift module, the frequency mixing module, the multimode circulator, the telescope, the optical amplifier and the detection module, particularly, the multimode circulator can be used for expanding an optical receiving view angle and receiving more echo signals, optical efficiency is improved, meanwhile, the optical amplifier at the rear end of the circulator is used for amplifying the received echo signals and then connecting the amplified echo signals into the detection module, amplification of the whole signal intensity can be achieved on the premise that system electric signal noise is not increased, the signal-to-noise ratio and the detection distance of the system are improved, and cost is reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or technical solutions in related arts, the drawings used in the description of the embodiments or related arts will be briefly introduced below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a pulse coherent wind lidar system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a pulse coherent wind lidar system according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of the multimode circulator, the telescope and the optical amplifier according to the embodiment of the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 provides a pulse coherent wind lidar system, as shown in fig. 1, comprising: the device comprises a light source module 1, a light splitting module 2, a frequency shifting module 3, a frequency mixing module 4, a multi-mode circulator 5, a telescope 6 connected with a first end of the multi-mode circulator 5, an optical amplifier 7 connected with a second end of the multi-mode circulator 5 and a detection module 8; wherein the content of the first and second substances,
the light source module 1 is used for emitting local oscillation continuous laser;
the optical splitting module 2 is used for splitting the local oscillation continuous laser into two parts of light, wherein the first part of light enters the frequency shift module 3, and the second part of light enters the frequency mixing module 4;
the frequency shift module 3 is used for performing frequency shift, modulation and amplification processing on the first part of light, and transmitting the processed pulse laser into the multimode circulator 5;
the multimode circulator 5 is used for transmitting the received pulse laser into the telescope 6, receiving an echo signal transmitted back by the telescope 6 and transmitting the echo signal into the optical amplifier 7;
the optical amplifier 7 is used for amplifying the echo signal and transmitting the echo signal to the frequency mixing module 4;
the frequency mixing module 4 is configured to perform coupling frequency mixing processing on the amplified echo signal and the second portion of light, and transmit the frequency-mixed optical signal to the detection module 8;
and the detection module 8 is used for performing signal conversion and data processing on the mixed optical signal.
In the pulse coherent wind lidar system provided by the embodiment of the invention, atmospheric wind field measurement can be realized through the interaction of the light source module 1, the light splitting module 2, the frequency shift module 3, the frequency mixing module 4, the multimode circulator 5, the telescope 6, the optical amplifier 7 and the detection module 8, particularly, the multimode circulator 5 can expand an optical receiving view angle, receive more echo signals and improve optical efficiency, and meanwhile, the optical amplifier 7 at the rear end of the circulator is used for amplifying the received echo signals and then connecting the amplified echo signals into the detection module 8, so that the amplification of the whole signal intensity can be realized on the premise of not increasing the noise of system electric signals, the signal-to-noise ratio and the detection distance of the system are improved, the cost is reduced, and further wind speed detection at a longer distance is realized.
It should be noted that, the pulse coherent wind lidar system is a coherent wind lidar system integrating transceiving, and the transmitting and receiving of laser are realized by the mode of matching the multimode circulator 5 with the telescope 6, compared with a single-mode fiber, the fiber core of the multimode fiber is thicker, the diameter of the fiber core is generally 50um, so that light in multiple modes is allowed to be transmitted in the fiber, and the fiber has a larger numerical aperture, such as NA =0.22, that is, a larger receiving field angle is provided, the optical receiving efficiency of the system is improved, and the theoretical highest coupling efficiency is 96%.
The optical amplifier 7 is a device that amplifies a weak optical signal injected therein with a certain gain medium to obtain a sufficient optical gain and converts the weak optical signal into a strong optical signal, thereby realizing direct optical amplification of the optical signal, and is, for example, an erbium-doped fiber amplifier, a raman fiber amplifier, or the like. The optical amplifier 7 is an optical amplification relay device which can realize the enhancement of weak optical signals in the optical transmission process and can be arranged in optical fiber transmission. The pulse coherent wind lidar system provided by the embodiment of the invention is additionally provided with the optical amplifier 7 at the signal receiving end, can realize the amplification of weak optical signals, further improves the signal-to-noise ratio of the system, prolongs the wind speed detection distance, and has more advantages in function and system.
Further, in a practical implementation, in the pulse coherent wind lidar system provided in an embodiment of the present invention, as shown in fig. 2, the frequency shift module 3 may include:
the acousto-optic modulator 31 is used for completing frequency shift of the first part of light and modulating the continuous laser after frequency shift into pulse laser;
the first amplifier 32 is configured to amplify the modulated pulse laser to obtain an amplified pulse laser, and transmit the amplified pulse laser to the multimode circulator 5.
In practical implementation, in the pulse coherent wind lidar system provided by the embodiment of the present invention, as shown in fig. 3, an input terminal a of the multimode circulator 5 may be connected to an output terminal of the first amplifier 32;
an input end a of the multimode circulator 5, configured to receive the pulsed laser output by the first amplifier 32 and transmit the pulsed laser to a first end b of the multimode circulator 5;
the first end b of the multimode circulator 5 is used for emitting the received pulse laser to the telescope 6, so that the telescope 6 emits the pulse laser into the atmosphere in a collimation manner to generate an echo signal (namely a backscattering signal of an atmosphere echo), and the first end b of the multimode circulator 5 is also used for receiving the echo signal returned by the telescope 6 and transmitting the echo signal into the second end c of the multimode circulator 5;
and a second end c of the multimode circulator 5 for emitting the echo signal to the optical amplifier 7.
Specifically, as shown in fig. 3, the amplified pulse laser enters from the input end a of the multimode circulator 5, the first end b is emitted and collimated by the telescope 6 to be emitted to the atmosphere, the atmosphere echo backscattered signal is also received by the telescope 6 and enters from the first end b of the multimode circulator 5, and the second end c is emitted and enters the optical amplifier 7 for signal light amplification.
In a specific implementation, in the pulse coherent wind lidar system according to an embodiment of the present invention, as shown in fig. 1 and fig. 2, the frequency mixing module 4 may include a 2 × 2 coupler 41; the first end of the 2 x 2 coupler 41 is connected to the optical splitting module 2, and the second end is connected to the optical amplifier 7. Preferably, the 2 × 2 coupler 41 may be a multimode 2 × 2 coupler; in the multimode 2 x 2 fiber coupler, two input multimode fibers and two output multimode fibers can mix two signals of the input fibers, and are connected to the detection module 8 through the output fibers for mixing detection. In practical application, the multimode 2 x 2 coupler may adopt a PM1550nm optical fiber coupler, which is a polarization-maintaining optical fiber coupler with an operating wavelength of 1550nm, and can realize that two paths of light simultaneously enter and are coupled and then are simultaneously output from two output ends.
In a specific implementation, in the pulse coherent wind lidar system provided in an embodiment of the present invention, as shown in fig. 1 and fig. 2, the detection module 8 may include:
the balance detector 81 is connected with the output end of the frequency mixing module 4 and is used for converting the optical signals after frequency mixing into electric signals; preferably, the balanced detector 81 may be a low-noise PIN-type photodetector;
and the data acquisition card 82 is used for carrying out data acquisition and data processing on the electric signals.
In specific implementation, in the pulse coherent wind lidar system provided in the embodiment of the present invention, the multimode circulator 5 may be a PM1550 multimode circulator, where the circulator has an operating wavelength of 1550nm, the optical fiber is made of a polarization maintaining optical fiber, the insertion loss is less than 1dB, and the optical path is annular. In addition, the focal length of the telescope 6 may be 400mm, and the receiving aperture may be 100 mm.
In a specific implementation, in the pulse coherent wind lidar system provided in the embodiment of the present invention, the beam splitter 21 may be adopted as the beam splitting module 2. The light source module 1 may employ a seed laser 11; specifically, the laser emitting part may specifically select a commercial fiber laser, such as a high power pulse fiber laser, with a pulse energy of 100 uJ and a repetition frequency of 20 KHz.
The following describes a working process of the pulse coherent wind lidar system according to an embodiment of the present invention with a specific example, as shown in fig. 2, the specific steps are as follows:
after the seed laser 11 emits the local oscillation continuous laser and is split by the beam splitter 21, a first part of light enters the acousto-optic modulator 31 to complete frequency shift and modulation to obtain pulse laser, and then enters the first amplifier 32 to realize light amplification to obtain the pulse laser after frequency shift, modulation and amplification, the pulse laser is transmitted to the atmosphere through the telescope 6 after passing through the multimode circulator 5, a back scattering signal of an atmosphere echo is received by the telescope 6, enters the optical amplifier 7 through another passage of the multimode circulator 5 to realize signal light amplification, the light amplified by the optical amplifier 7 and a second part of light split by the beam splitter 21 are coupled and mixed by the multimode 2 x 2 coupler 41, then enter the balance detector 81 to be converted into electric signals, and finally, data acquisition and processing are performed by the data acquisition card 82.
It should be pointed out that, the multimode circulator 5 is used for transmitting and receiving laser signals, the diameter of the fiber core of the multimode fiber is about 5-10 times of that of the single-mode fiber, and the larger diameter of the fiber core enables the multimode fiber to have a larger numerical aperture NA, which means that the multimode fiber has a larger receiving field angle, and the optical receiving efficiency of the whole laser radar system is improved; in addition, the laser radar signal transmission process is short-distance transmission, loss and dispersion in the transmission process can be ignored by adopting the multimode optical fiber, and compared with the single-mode optical fiber, the multimode optical fiber has lower material cost. Meanwhile, the optical amplifier 7 is introduced behind the receiving end of the multimode circulator 5, so that the received optical signal is amplified, the strength of an echo signal is improved, and the signal-to-noise ratio of the system is improved.
The embodiments are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same or similar parts among the embodiments are referred to each other.
To sum up, a pulse coherent wind lidar system provided by the embodiment of the present invention includes: the device comprises a light source module 1, a light splitting module 2, a frequency shifting module 3, a frequency mixing module 4, a multi-mode circulator 5, a telescope 6 connected with a first end of the multi-mode circulator 5, an optical amplifier 7 connected with a second end of the multi-mode circulator 5 and a detection module 8; the system comprises a light source module 1, a local oscillator module and a control module, wherein the light source module 1 is used for transmitting local oscillator continuous laser; the optical splitting module 2 is used for splitting the local oscillation continuous laser into two parts of light, wherein the first part of light enters the frequency shifting module 3, and the second part of light enters the frequency mixing module 4; the frequency shift module 3 is used for performing frequency shift, modulation and amplification processing on the first part of light, and transmitting the processed pulse laser into the multimode circulator 5; the multimode circulator 5 is used for transmitting the received pulse laser into the telescope 6, receiving an echo signal transmitted back by the telescope 6 and transmitting the echo signal into the optical amplifier 7; the optical amplifier 7 is used for amplifying the echo signal and transmitting the echo signal to the frequency mixing module 4; the frequency mixing module 4 is configured to perform coupling frequency mixing processing on the amplified echo signal and the second portion of light, and transmit the frequency-mixed optical signal to the detection module 8; and the detection module 8 is used for performing signal conversion and data processing on the mixed optical signal. Like this through light source module 1, beam splitting module 2, frequency shift module 3, mixing module 4, multimode circulator 5, telescope 6, the interaction of optical amplifier 7 and detection module 8 can realize atmospheric wind field and measure, especially, utilize multimode circulator 5 can enlarge the optical reception angle of vision, receive more echo signal, improve optical efficiency, utilize the optical amplifier 7 at the circulator rear end to insert detection module 8 after amplifying the echo signal of receipt simultaneously, can be under the prerequisite that does not increase system's electric signal noise, realize the amplification of whole signal intensity, promote the SNR and the detection distance of system, reduce cost.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The pulse coherent wind lidar system provided by the invention is described in detail above, a specific example is applied in the text to explain the principle and the implementation of the invention, and the description of the above embodiment is only used to help understanding the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A pulsed coherent wind lidar system, comprising: the device comprises a light source module, a light splitting module, a frequency shifting module, a frequency mixing module, a multi-mode circulator, a telescope connected with a first end of the multi-mode circulator, an optical amplifier connected with a second end of the multi-mode circulator and a detection module; wherein the content of the first and second substances,
the light source module is used for emitting local oscillation continuous laser;
the optical splitting module is used for splitting the local oscillation continuous laser into two parts of light, wherein the first part of light enters the frequency shift module, and the second part of light enters the frequency mixing module;
the frequency shift module is used for carrying out frequency shift, modulation and amplification processing on the first part of light and transmitting the processed pulse laser into the multimode circulator;
the multimode circulator is used for transmitting the received pulse laser into the telescope, receiving an echo signal transmitted back by the telescope and transmitting the echo signal into the optical amplifier;
the optical amplifier is used for amplifying the echo signal and transmitting the echo signal to the frequency mixing module;
the frequency mixing module is configured to perform coupling frequency mixing processing on the amplified echo signal and the second part of light, and transmit a frequency-mixed optical signal to the detection module;
and the detection module is used for performing signal conversion and data processing on the optical signals after frequency mixing.
2. The pulsed coherent wind lidar system of claim 1, wherein the frequency shift module comprises:
the acousto-optic modulator is used for completing frequency shift of the first part of light and modulating the continuous laser after frequency shift into pulse laser;
and the first amplifier is used for amplifying the optical signal of the modulated pulse laser to obtain amplified pulse laser and transmitting the amplified pulse laser into the multimode circulator.
3. A pulsed coherent wind lidar system according to claim 2, wherein an input of the multi-mode circulator is connected to an output of the first amplifier;
the input end of the multimode circulator is used for receiving pulse laser and transmitting the pulse laser to the first end of the multimode circulator;
the first end of the multimode circulator is used for emitting the received pulse laser to the telescope so that the telescope can emit the pulse laser to the atmosphere in a collimation mode to generate the echo signal, and the first end of the multimode circulator is also used for receiving the echo signal returned by the telescope and transmitting the echo signal into the second end of the multimode circulator;
a second end of the multi-mode circulator for exiting the echo signal to the optical amplifier.
4. The pulsed coherent wind lidar system of claim 1, wherein the mixing module comprises a 2 x 2 coupler; and the first end of the 2 x 2 coupler is connected with the optical splitting module, and the second end of the 2 x 2 coupler is connected with the optical amplifier.
5. The pulsed coherent wind lidar system of claim 1, wherein the detection module comprises:
the balance detector is connected with the output end of the frequency mixing module and is used for converting the optical signals after frequency mixing into electric signals;
and the data acquisition card is used for carrying out data acquisition and data processing on the electric signals.
6. The pulsed coherent wind lidar system of claim 1, wherein the optical amplifier is an EDFA erbium doped fiber amplifier.
7. A pulsed coherent wind lidar system according to claim 4, wherein the 2 x 2 coupler is a multimode 2 x 2 coupler.
8. A pulsed coherent wind lidar system according to claim 5, wherein the balanced detector is a PIN photodetector.
9. The pulsed coherent wind lidar system of claim 1, wherein the beam splitting module is a beam splitter.
10. The pulsed coherent wind lidar system of claim 1, wherein the light source module is a seed laser.
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