CN114726445A - Laser communication terminal - Google Patents
Laser communication terminal Download PDFInfo
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- CN114726445A CN114726445A CN202210409768.9A CN202210409768A CN114726445A CN 114726445 A CN114726445 A CN 114726445A CN 202210409768 A CN202210409768 A CN 202210409768A CN 114726445 A CN114726445 A CN 114726445A
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- signal
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- polarization multiplexing
- polarization
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- 238000004891 communication Methods 0.000 title claims abstract description 37
- 230000010287 polarization Effects 0.000 claims abstract description 96
- 230000003287 optical effect Effects 0.000 claims abstract description 74
- 238000002955 isolation Methods 0.000 abstract description 9
- 230000007547 defect Effects 0.000 abstract description 3
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 4
- 239000000835 fiber Substances 0.000 description 3
- 230000004075 alteration Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
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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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
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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
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- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The invention discloses a laser communication terminal, comprising: the system comprises a laser signal transmitter, a polarization multiplexing module, a signal exchange module and a first signal receiving module; the laser signal emitter emits a laser signal; the polarization multiplexing module is connected with the laser signal transmitter through a light path; the signal exchange module is connected with the polarization multiplexing module through an optical path and is used for outputting or receiving signals to or from an external free space; the first signal receiving module is connected with the polarization multiplexing module through an optical path and used for receiving the signals received by the polarization multiplexing module. The invention realizes the isolation between the same-frequency receiving and transmitting lasers by sharing the receiving and transmitting light path in the polarization state, and solves the defect of large limitation on the wavelength of laser communication due to the adoption of frequency band isolation in the prior art.
Description
Technical Field
The invention relates to the technical field of laser communication equipment, in particular to a laser communication terminal.
Background
With the proposal and development of satellite internet concept, the requirement of satellite communication system for communication rate is higher and higher, and space laser communication becomes the most mainstream choice for high-speed satellite communication. In the field of space laser communication, a laser communication terminal as a laser transmitting and receiving device plays a crucial role in the quality of laser communication. Due to the limitation of the size, weight, power consumption and other conditions of the satellite, most laser communication terminals adopt a transmitting-receiving common optical path design, but the transmitting-receiving laser needs to be isolated, and the transmitting laser will interfere with the receiving laser.
In the prior art, most of laser communication terminals adopt a frequency band isolation method for transmitting and receiving laser, so-called frequency band isolation, that is, transmitted laser and received laser adopt different wavelengths, and the isolation of the transmitted and received laser is realized by a filtering mode.
Disclosure of Invention
According to an embodiment of the present invention, there is provided a laser communication terminal including: the system comprises a laser signal transmitter, a polarization multiplexing module, a signal exchange module and a first signal receiving module;
the laser signal emitter emits a laser signal;
the polarization multiplexing module is connected with the laser signal transmitter through a light path;
the signal exchange module is connected with the polarization multiplexing module through an optical path and is used for outputting or receiving signals to or from an external free space;
the first signal receiving module is connected with the polarization multiplexing module through an optical path and used for receiving the signals received by the polarization multiplexing module.
Further, the polarization multiplexing module includes: a polarization beam splitter and a quarter wave plate;
the polarization beam splitter is connected with the laser signal transmitter through a light path;
the quarter wave plate is arranged between the polarization beam splitter and the signal exchange module, and the fast axis direction of the quarter wave plate and the polarization direction of the polarization beam splitter are arranged at an angle of 45 degrees.
Further, the signal exchange module comprises: and the first optical antenna is connected with the polarization multiplexing module through an optical path and is used for transmitting the signal output by the polarization multiplexing module to a free space and receiving the signal of the free space to the polarization multiplexing module.
Further, the method also comprises the following steps: and the beacon transmitter is used for transmitting a beacon signal to the free space.
Further, the first signal receiving module comprises: the system comprises a first signal separator, a first laser signal receiver and a first beacon signal receiver;
the first signal separator is connected with the polarization multiplexing module through an optical path and used for receiving and separating the signals received by the polarization multiplexing module to obtain laser signals and beacon signals;
the first laser signal receiver is connected with the first signal separator through a light path and used for acquiring laser signals acquired by the first signal separator;
the first beacon signal receiver is connected with the first signal separator through an optical path and used for acquiring the beacon signals acquired by the first signal separator.
Further, the first signal separator is a dichroic mirror or a beam splitter.
Further, the first signal receiving module comprises: and the second laser signal receiver is connected with the polarization multiplexing module through an optical path and is used for acquiring the signal received by the polarization multiplexing module.
Furthermore, the second signal receiving module is connected with the signal exchange module and the polarization multiplexing module through an optical path.
Further, the second signal receiving module comprises: a second signal separator and a second beacon signal receiver;
the second signal separator is connected with the polarization taking module and the signal exchange module through a light path, transmits the signal output by the polarization multiplexing module to the signal exchange module, acquires and separates the signal received by the signal exchange module, acquires a laser signal and a beacon signal, and transmits the laser signal to the polarization multiplexing module;
the second beacon receiver is connected with the second signal separator through an optical path and used for acquiring beacon signals.
Further, the second signal separator is a dichroic mirror or a beam splitter.
According to the laser communication terminal provided by the embodiment of the invention, the isolation between the same-frequency receiving and transmitting lasers is realized by sharing the receiving and transmitting light path in the polarization state, and the defect of large limitation on the wavelength of laser communication due to the adoption of frequency band isolation in the prior art is overcome.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and are intended to provide further explanation of the claimed technology.
Drawings
Fig. 1 is a schematic diagram of a first embodiment of a laser communication terminal according to the present invention;
fig. 2 is a schematic diagram of a second embodiment of a laser communication terminal according to the present invention;
fig. 3 is a schematic structural diagram of a second embodiment of a laser communication terminal according to the present invention;
fig. 4 is a schematic diagram of a third embodiment of a laser communication terminal according to the embodiment of the present invention.
Detailed Description
The present invention will be further explained by describing preferred embodiments of the present invention in detail with reference to the accompanying drawings.
First, a laser communication terminal according to an embodiment of the present invention will be described with reference to fig. 1 to 4, which is used for laser communication and has a wide application range.
As shown in fig. 1 to 4, a laser communication terminal according to an embodiment of the present invention includes: the device comprises a laser signal transmitter 1, a polarization multiplexing module, a signal exchange module and a first signal receiving module.
Specifically, as shown in fig. 1 to 4, a laser signal emitter 1 emits a laser signal; the polarization multiplexing module is connected with the laser signal transmitter 1 through a light path; the signal exchange module is connected with the polarization multiplexing module through an optical path and is used for outputting or receiving signals to or from an external free space; the first signal receiving module is connected with the polarization multiplexing module through an optical path and used for receiving the signals received by the polarization multiplexing module.
Further, as shown in fig. 1 to 4, the polarization multiplexing module includes: a polarization beam splitter 21 and a quarter wave plate 22; the polarization beam splitter 21 is connected with the laser signal transmitter 1 through an optical path; the quarter wave plate 22 is arranged between the polarization beam splitter 21 and the signal exchange module, and the fast axis direction of the quarter wave plate 22 and the polarization direction of the polarization beam splitter 21 are arranged at an angle of 45 degrees; the laser signal emitter 1 emits an optical signal to the polarization beam splitter 21, at this time, the optical signal is linearly polarized light with a polarization direction consistent with a reflection direction of the polarization beam splitter 21, the polarization beam splitter 21 reflects the optical signal to the quarter-wave plate 22, the optical signal passing through the quarter-wave plate 22 is changed into circularly polarized light, and the circularly polarized light is output to a free space through the signal exchange module.
Further, as shown in fig. 1 to 2, the signal exchange module includes: and the first optical antenna 31, the first optical antenna 31 is connected with the polarization multiplexing module through an optical path, and is used for transmitting the signal output by the polarization multiplexing module to a free space and receiving the signal of the free space to the polarization multiplexing module.
Further, as shown in fig. 2 to 4, the method further includes: and the beacon transmitter is used for transmitting a beacon signal to the free space.
Further, as shown in fig. 2 to 3, the first signal receiving module includes: a first signal separator 41, a first laser signal receiver 42 and a first beacon signal receiver 43; the first signal separator 41 is connected to the polarization multiplexing module through an optical path, and is configured to receive and separate the signal received by the polarization multiplexing module, so as to obtain a laser signal and a beacon signal;
the first laser signal receiver 42 is connected to the first signal separator 41 through an optical path, and is configured to obtain a laser signal obtained by the first signal separator 41; the first beacon signal receiver 43 is connected to the first signal separator 41 through an optical path, and is configured to acquire the beacon signal acquired by the first signal separator 41.
Further, as shown in fig. 2 to 3, the first signal separator 41 is a dichroic mirror or a beam splitter.
Further, as shown in fig. 4, the first signal receiving module includes: and the second laser signal receiver 44, the second laser signal receiver 44 and the polarization multiplexing module are connected through an optical path, and are used for acquiring the signal received by the polarization multiplexing module.
Further, as shown in fig. 4, the method further includes: and the second signal receiving module is connected with the signal exchange module and the polarization multiplexing module through an optical path.
Further, as shown in fig. 4, the second signal receiving module includes: the second signal separator 32 and the second beacon signal receiver 33; the second signal separator 32 is optically connected to the polarization taking module and the signal switching module, the second signal separator 32 transmits the signal output by the polarization multiplexing module to the signal switching module, the second signal separator 32 obtains and separates the signal received by the signal switching module, obtains a laser signal and a beacon signal, and transmits the laser signal to the polarization multiplexing module; the second beacon signal receiver 33 is optically connected to the second signal splitter 32 for obtaining the beacon signal.
Further, as shown in fig. 4, the second signal separator 32 is a dichroic mirror or a beam splitter.
The first embodiment is as follows:
as shown in fig. 1, when the apparatus is in operation, the laser signal transmitter 1 generates and outputs a laser signal to the polarization beam splitter 21, the polarization beam splitter 21 transmits the laser signal to the quarter-wave plate 22, the quarter-wave plate 22 transmits the laser signal to the first optical antenna 31, and the first optical antenna 31 outputs the laser signal into free space; meanwhile, the first optical antenna 31 receives the optical signal from the free space and transmits the received optical signal to the quarter-wave plate 22, the quarter-wave plate 22 transmits the optical signal received by the first optical antenna 31 to the polarization beam splitter 21, and the polarization beam splitter 21 transmits the optical signal received by the quarter-wave plate 22 to the first signal receiving module, which is received by the first signal receiving module, and the beacon signal transmitter of the present embodiment may be replaced by the laser signal transmitter 1 of the present embodiment.
Example two:
as shown in fig. 2 to 3, when the device is in operation, the beacon signal transmitter transmits a beacon signal into a free space, and the laser signal transmitter 1 generates and outputs a laser signal to the polarization beam splitter 21, the polarization beam splitter 21 transmits the laser signal to the quarter-wave plate 22, the quarter-wave plate 22 transmits the laser signal to the first optical antenna 31, and the first optical antenna 31 outputs the laser signal into the free space; meanwhile, the first optical antenna 31 receives the optical signal in the free space and transmits the received optical signal to the quarter-wave plate 22, the quarter-wave plate 22 transmits the optical signal received by the first optical antenna 31 to the polarization beam splitter 21, the polarization beam splitter 21 transmits the optical signal received by the quarter-plectrum to the first signal separator 41, the first signal separator 41 separates and processes the received optical signal to obtain the laser signal and the beacon signal, the first signal separator 41 transmits the laser signal to the first laser signal receiver 42 and receives the laser signal by the first laser signal receiver 42, and meanwhile, the first signal separator 41 transmits the beacon signal to the first beacon signal receiver 43, and the beacon signal transmitter of the present embodiment may be replaced by the laser signal transmitter 1 of the present embodiment.
Preferably, as shown in fig. 2 to 3, when the device is in operation, the beacon signal transmitter transmits a beacon signal into a free space, and the laser signal transmitter 1 generates and outputs a laser signal to the polarization beam splitter 21, the laser signal transmitter 1 is composed of a signal output fiber 11 and an output collimator 12, the laser signal output by the output collimator 12 is reflected by a first mirror 13 and transmitted to the polarization beam splitter 21, the polarization beam splitter 21 transmits the laser signal to a quarter-wave plate 22, and the quarter-wave plate 22 transmits the laser signal to the first optical antenna 31, wherein the first optical antenna 31 is composed of a fourth mirror 313 and a fifth mirror 314, the quarter-wave plate 22 transmits the laser signal to the second mirror 311, the second mirror 311 transmits the laser signal to the third mirror 312, the third mirror 312 transmits the laser signal to the fourth mirror 313, the fourth mirror 313 transmits the laser signal to the fifth mirror 314, the fifth mirror 314 passes the laser signal into free space; meanwhile, the fifth mirror 314 receives the optical signal in the free space and transmits the received optical signal to the fourth mirror 313, the fourth mirror 313 transmits the optical signal to the third mirror 312, the third mirror 312 transmits the optical signal to the second mirror 311, the second mirror 311 transmits the optical signal to the quarter-wave plate 22, the quarter-wave plate 22 transmits the optical signal to the polarization beam splitter 21, the polarization beam splitter 21 transmits the optical signal to the first signal separator 41, the first signal separator 41 separates and processes the optical signal to obtain the laser signal and the beacon signal, the first signal separator 41 transmits the laser signal to the first laser signal receiver 42, the first signal separator 41 transmits the beacon signal to the first beacon signal receiver 43, wherein the first laser signal receiver 42 is composed of a laser signal coupler 421 and a signal receiving fiber 422, the first signal separator 41 transmits the laser signal to the laser signal coupler 421, then, the laser signal coupler 421 transmits the laser signal to the signal receiving fiber 422; the first beacon signal receiver 43 is composed of a beacon signal coupler 431 and a camera 432, and the first signal separator 41 transmits the beacon signal to the beacon signal coupler 431 and then transmits the beacon signal to the camera 432 through the beacon signal coupler 431.
Example three:
as shown in fig. 4, when the device is in operation, the beacon signal transmitter transmits a beacon signal into free space, the laser signal transmitter 1 generates and outputs a laser signal to the polarization beam splitter 21, the polarization beam splitter 21 transmits the laser signal to the quarter-wave plate 22, the quarter-wave plate 22 transmits the laser signal to the second signal separator 32, the second signal separator 32 transmits the laser signal to the first optical antenna 31, the first optical antenna 31 outputs the laser signal into free space, at the same time, the first optical antenna 31 receives the optical signal in free space, the first optical antenna 31 transmits the received optical signal to the second signal separator 32, the second signal separator 32 separates and processes the optical signal received by the first optical antenna 31 to obtain the laser signal and the beacon signal, the second signal separator 32 transmits the beacon signal to the second beacon signal receiver 33 to be received by the second beacon signal receiver 33, the second signal separator 32 transmits the laser signal to the quarter wave plate 22, the quarter wave plate 22 transmits the laser signal to the polarization beam splitter 21, and the polarization beam splitter 21 transmits the laser signal to the second laser signal receiver 44 and is received by the second laser signal receiver 44; since the beacon signal received by the first optical antenna 31 of the present embodiment is not processed by the polarization multiplexing module, the present embodiment has no requirement on the polarization state of the beacon signal, and the beacon signal transmitter of the present embodiment may be replaced by the laser signal transmitter 1 of the present embodiment.
In the above, with reference to fig. 1 to 4, the laser communication terminal according to the embodiment of the present invention is described, which implements isolation between same-frequency transmit-receive lasers by using a polarization-state common transmit-receive optical path, so as to solve the defect of large limitation on the wavelength of laser communication due to the adoption of frequency band isolation in the prior art.
It should be noted that, in the present specification, 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 … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A laser communication terminal, comprising: the system comprises a laser signal transmitter, a polarization multiplexing module, a signal exchange module and a first signal receiving module;
the laser signal transmitter transmits a laser signal;
the polarization multiplexing module is connected with the laser signal transmitter through a light path;
the signal exchange module is connected with the polarization multiplexing module through an optical path and is used for outputting or receiving signals to or from an external free space;
the first signal receiving module is connected with the polarization multiplexing module through an optical path and is used for receiving the signal received by the polarization multiplexing module.
2. The laser communication terminal as claimed in claim 1, wherein said polarization multiplexing module comprises: a polarization beam splitter and a quarter wave plate;
the polarization beam splitter is connected with the laser signal transmitter through a light path;
the quarter wave plate is arranged between the polarization beam splitter and the signal exchange module, and the fast axis direction of the quarter wave plate and the polarization direction of the polarization beam splitter are arranged at an angle of 45 degrees.
3. The laser communication terminal as claimed in claim 1, wherein said handshake module comprises: the first optical antenna is connected with the polarization multiplexing module through an optical path and used for transmitting the signal output by the polarization multiplexing module to the free space and receiving the signal of the free space to the polarization multiplexing module.
4. The laser communication terminal as claimed in claim 1, further comprising: a beacon transmitter for transmitting a beacon signal into said free space.
5. The laser communication terminal as claimed in claim 1, wherein said first signal receiving module comprises: the first signal separator, the first laser signal receiver and the first beacon signal receiver;
the first signal separator is connected with the polarization multiplexing module through an optical path and used for receiving and separating the signals received by the polarization multiplexing module to obtain laser signals and beacon signals;
the first laser signal receiver is connected with the first signal separator through an optical path and used for acquiring the laser signal acquired by the first signal separator;
the first beacon signal receiver is connected with the first signal separator through an optical path and is used for acquiring the beacon signals acquired by the first signal separator.
6. The laser communication terminal as claimed in claim 5, wherein the first signal separator is a dichroic mirror or a beam splitter.
7. The laser communication terminal as claimed in claim 1, wherein said first signal receiving module comprises: and the second laser signal receiver is connected with the polarization multiplexing module through an optical path and is used for acquiring the signal received by the polarization multiplexing module.
8. The laser communication terminal as claimed in claim 1, further comprising: and the second signal receiving module is connected with the signal exchange module and the polarization multiplexing module through an optical path.
9. The laser communication terminal as claimed in claim 8, wherein said second signal receiving module comprises: a second signal separator and a second beacon signal receiver;
the second signal separator is optically connected with the polarization taking module and the signal exchange module, transmits the signal output by the polarization multiplexing module to the signal exchange module, acquires and separates the signal received by the signal exchange module, acquires a laser signal and a beacon signal, and transmits the laser signal to the polarization multiplexing module;
the second beacon signal receiver is connected with the second signal separator through an optical path and used for acquiring the beacon signal.
10. The laser communication terminal as claimed in claim 9, wherein the second signal separator is a dichroic mirror or a beam splitter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210409768.9A CN114726445A (en) | 2022-04-19 | 2022-04-19 | Laser communication terminal |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210409768.9A CN114726445A (en) | 2022-04-19 | 2022-04-19 | Laser communication terminal |
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| CN114726445A true CN114726445A (en) | 2022-07-08 |
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| CN202210409768.9A Pending CN114726445A (en) | 2022-04-19 | 2022-04-19 | Laser communication terminal |
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Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906866A (en) * | 2001-06-26 | 2007-01-31 | 澳普蒂斯科技公司 | Atmospheric optical data transmission system |
| CN104811248A (en) * | 2015-03-24 | 2015-07-29 | 中国科学院光电技术研究所 | Free space laser communication optical isolation device |
| CN107124228A (en) * | 2017-06-13 | 2017-09-01 | 中国科学院光电技术研究所 | Method for high-precision separation of light beams with same frequency for transmitting and receiving space laser communication signal light |
| CN107919912A (en) * | 2017-12-28 | 2018-04-17 | 长春理工大学 | A kind of same frequency range palarization multiplexing laser space communication optical transmitter and receiver |
| CN110855368A (en) * | 2019-11-29 | 2020-02-28 | 中国科学院西安光学精密机械研究所 | High-isolation same-frequency space laser communication optical path for transmitting and receiving with same polarization state |
| US10841007B1 (en) * | 2019-12-19 | 2020-11-17 | Bae Systems Information And Electronic Systems Integration Inc. | Full duplex laser communication terminal architecture without dedicated beacon laser |
| US11159235B1 (en) * | 2020-05-28 | 2021-10-26 | CACI, Inc.—Federal | Optical communication terminal for bidirectional communication |
-
2022
- 2022-04-19 CN CN202210409768.9A patent/CN114726445A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1906866A (en) * | 2001-06-26 | 2007-01-31 | 澳普蒂斯科技公司 | Atmospheric optical data transmission system |
| CN104811248A (en) * | 2015-03-24 | 2015-07-29 | 中国科学院光电技术研究所 | Free space laser communication optical isolation device |
| CN107124228A (en) * | 2017-06-13 | 2017-09-01 | 中国科学院光电技术研究所 | Method for high-precision separation of light beams with same frequency for transmitting and receiving space laser communication signal light |
| CN107919912A (en) * | 2017-12-28 | 2018-04-17 | 长春理工大学 | A kind of same frequency range palarization multiplexing laser space communication optical transmitter and receiver |
| CN110855368A (en) * | 2019-11-29 | 2020-02-28 | 中国科学院西安光学精密机械研究所 | High-isolation same-frequency space laser communication optical path for transmitting and receiving with same polarization state |
| US10841007B1 (en) * | 2019-12-19 | 2020-11-17 | Bae Systems Information And Electronic Systems Integration Inc. | Full duplex laser communication terminal architecture without dedicated beacon laser |
| US11159235B1 (en) * | 2020-05-28 | 2021-10-26 | CACI, Inc.—Federal | Optical communication terminal for bidirectional communication |
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