CN112436891A - Laser optical shutter - Google Patents
Laser optical shutter Download PDFInfo
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- CN112436891A CN112436891A CN202011561233.0A CN202011561233A CN112436891A CN 112436891 A CN112436891 A CN 112436891A CN 202011561233 A CN202011561233 A CN 202011561233A CN 112436891 A CN112436891 A CN 112436891A
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- 238000006243 chemical reaction Methods 0.000 claims description 34
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- 230000005540 biological transmission Effects 0.000 abstract description 18
- 238000002955 isolation Methods 0.000 abstract description 8
- 238000004891 communication Methods 0.000 description 12
- 230000008859 change Effects 0.000 description 6
- 230000008676 import Effects 0.000 description 5
- 230000003321 amplification Effects 0.000 description 3
- 238000012544 monitoring process Methods 0.000 description 3
- 238000003199 nucleic acid amplification method Methods 0.000 description 3
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- 230000005611 electricity Effects 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
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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
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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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/801—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections
- H04B10/802—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water using optical interconnects, e.g. light coupled isolators, circuit board interconnections for isolation, e.g. using optocouplers
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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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L63/00—Network architectures or network communication protocols for network security
- H04L63/02—Network architectures or network communication protocols for network security for separating internal from external traffic, e.g. firewalls
- H04L63/0209—Architectural arrangements, e.g. perimeter networks or demilitarized zones
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Abstract
The invention discloses a laser shutter which is characterized by comprising a sending end and a receiving end, can meet the requirements of physical isolation and one-way feedback-free data transmission between networks, and has better electromagnetic interference resistance and interception resistance.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a laser shutter.
Background
With the advance of informatization construction, the safety transmission requirements of governments, armies, financial institutions, enterprises and the like on confidential information are increasing day by day, and the main requirement scene is that an external network conducts data import to an internal network and a non-confidential network conducts data import to the confidential network. According to the national network level protection standard and the actual application requirements, in the data import scene, only data is allowed to flow from the low-security level network to the high-security level network, namely, the low-security level network only has write-in permission but not read-in permission to the high-security level network, the high-security level network only has read-in permission but not write-in permission to the low-security level network, and the data transmission between the low-security level network and the high-security level network has strict one-way circulation.
In view of the above requirements, it is currently common to solve the problem of completing information one-way import by using a network gate, optical disk ferry and optical fiber shutter. The net floodgate introduces intermediate equipment on the network basis of traditional electricity connection, realize one-way transmission through setting up the filter rule, because the electricity connection has two-way conduction characteristic, so the net floodgate inevitably has the risk of data leakage, the mode that the CD ferry was burned through the CD, import the intranet with outer net information dump on CD medium, complex operation and inefficiency, the optical fiber optical gate adopts beam splitting technology, realize transmitting terminal self-checking through signal minute multichannel, the mutual check-up mode of many receiving terminals realizes the one-way accurate transmission of data, it is complicated numerous because of the cable junction, equipment volume consumption is relatively great, and mobility is poor.
Disclosure of Invention
The present invention addresses the deficiencies of the prior art by providing a laser shutter. The laser optical gate can meet the requirements of physical isolation and one-way feedback-free data transmission among networks, and has better electromagnetic interference resistance and interception resistance.
The technical scheme for realizing the purpose of the invention is as follows:
a laser shutter comprising a transmitting end and a receiving end, wherein,
the transmitting end comprises a transmitting end circuit board, the transmitting end circuit board is a plate-shaped body with a first U-shaped opening at one end, the outer area of the first U-shaped opening is symmetrically distributed, a laser is arranged at the center of the bottom of the opening of the first U-shaped opening, a transmitting end network voltage transformation module, a transmitting end signal conversion module and a driving module which are sequentially connected are arranged on the transmitting end circuit board, the transmitting end signal conversion module is connected with a transmitting end main control management module, the driving module is connected with the laser, a transmitting end base fixedly connected with the transmitting end circuit board is arranged in the opening area of the first U-shaped opening, the transmitting end base is provided with a first through hole with internal threads, a transmitting end lens cone with external threads is arranged in the first through hole, the transmitting end lens cone is in threaded connection with the transmitting end base, a collimating lens is;
the receiving end comprises a receiving end circuit board, the receiving end circuit board is a plate-shaped body with a second U-shaped opening at one end, the outer area of the second U-shaped opening is symmetrically distributed, the opening direction of the second U-shaped opening is over against the opening direction of the first U-shaped opening on the transmitting end circuit board, the bottom center position of the second U-shaped opening is provided with a detector, the receiving end circuit board is provided with an amplifying module, a receiving end signal conversion module and a receiving end network transformation module which are sequentially connected, the receiving end signal conversion module is connected with a receiving end main control management module, the amplifying module is connected with the detector, the opening area of the second U-shaped opening is provided with a receiving end base fixedly connected with the receiving end circuit board, the receiving end base is provided with a second through hole with internal threads, a receiving end lens cone with external threads is arranged in the second through hole, a focusing lens is arranged in the receiving end lens barrel, and the receiving end lens barrel is coaxially fixed with the detector;
the transmitting end base and the receiving end base are coaxial.
The collimating lens can move in the lens barrel at the transmitting end, so that the distance between the collimating lens and the laser can be adjusted, the divergence angle of the space optical signal light beam can be adjusted, the receiving power of the detector at the receiving end can be ensured to be sufficient at different distances, and the device can be suitable for various communication distances.
The transmitting end base and the receiving end base are coaxial, the tolerance is +/-0.05 mm, and the deviation of the parallelism of the spatial light signal direction transmitted by the transmitting end and the normal of the light-emitting surface of the transmitting end base is less than 1 degree.
The transmitting end and the receiving end are respectively provided with a transmitting end power supply module and a receiving end power supply module which provide energy for the transmitting end circuit board and the receiving end circuit board.
The UDP protocol Ethernet signal of the outer network firstly flows into the transmitting terminal network voltage transformation module, the transmitting terminal network voltage transformation module completes external high voltage isolation, clutter suppression and waveform recovery are achieved on the signal, then the signal flows into the transmitting terminal signal conversion module, the Ethernet signal is converted into a serial data signal of TTL level, the serial data signal of TTL level flows into the driving module, and the driving module senses the signal to drive the laser to emit light.
After the detector receives the optical signal, the detector converts the intensity change of the input light beam into corresponding weak current change, the current signal is amplified by the amplification module to become a serial TTL level signal, then the serial TTL level signal becomes a network electric signal after passing through the receiving end signal conversion module, and the network electric signal is boosted by the receiving end network voltage transformation module and then is led into an internal network to become an Ethernet signal.
The UDP protocol Ethernet signal of the outer network flows in from the sending end, is converted into a space optical signal with a specific direction by the sending end, flows into the receiving end through the transmission of an atmospheric channel, is converted into an electric signal by the receiving end, and finally flows into the inner network, so that the one-way transmission function of the signal is realized.
According to the technical scheme, the Ethernet electrical signals with the bidirectional conduction characteristic are converted into the space optical signals with the unidirectional conduction characteristic, so that the unidirectional transmission of data is realized between the separated sending end and the receiving end, and the physical isolation transmission requirement is met; the spatial light divergence angle adjustment is realized by adjusting the distance between the collimating lens at the sending end and the laser, so that the maximum effective transmission distance of the signal beam is controlled, the communication requirements of different distances can be met, and the installation is flexible; the machining tolerance of the optical unit at the transmitting end and the optical unit at the receiving end ensures the assembly precision, so that the equipment is easy to debug and install; light is used as a transmission carrier, and the anti-electromagnetic interference and anti-interception capability is good.
The laser optical gate can meet the requirements of physical isolation and one-way feedback-free data transmission among networks, and has better electromagnetic interference resistance and interception resistance.
Drawings
FIG. 1 is a schematic structural view of an embodiment;
FIG. 2 is a cross-sectional layout view of the structure of the embodiment;
fig. 3 is a schematic circuit diagram of an embodiment.
In the figure, 1, a sending end circuit board 2, a first U-shaped notch 3, a laser 4, a sending end base 5, a first through hole 6, a sending end lens cone 7, a collimating lens 8, a receiving end circuit board 9, a second U-shaped notch 10, a detector 11, a receiving end base 12, a second through hole 13, a receiving end lens cone 14, a focusing lens 15, a sending end power module 16 and a receiving end power module.
Detailed Description
The invention will be further elucidated with reference to the drawings and examples, without however being limited thereto
Example (b):
referring to fig. 1 and 2, a laser shutter includes a transmitting end and a receiving end, wherein,
the transmitting end comprises a transmitting end circuit board 1, the transmitting end circuit board 1 is a plate-shaped body with a first U-shaped opening 2 at one end, the outer area of the first U-shaped opening 2 is symmetrically distributed, a laser 3 is arranged at the central position of the opening bottom of the first U-shaped opening, as shown in figure 3, a transmitting end network voltage transformation module, a transmitting end signal conversion module and a driving module which are sequentially connected are arranged on the transmitting end circuit board 1, the transmitting end signal conversion module is connected with a transmitting end main control management module, the driving module is connected with the laser 3, a transmitting end base 4 fixedly connected with the transmitting end circuit board 1 is arranged in the opening area of the first U-shaped opening 2, the transmitting end base 4 is provided with a first through hole 5 with internal threads, a transmitting end lens barrel 6 with external threads is arranged in the first through hole 5, the transmitting end lens barrel 6 is in threaded connection with the transmitting end base, the lens cone 6 of the sending end is coaxially fixed with the laser 3;
as shown in fig. 3, the receiving terminal includes a receiving terminal circuit board 8, the receiving terminal circuit board 8 is a plate-shaped body with a second U-shaped opening 9 at one end, the outer area of the second U-shaped opening 9 is symmetrically distributed, the opening direction of the second U-shaped opening 9 is opposite to the opening direction of the first U-shaped opening 2 on the sending terminal circuit board 1, the central position of the bottom of the opening of the second U-shaped opening 9 is provided with a detector 10, the receiving terminal circuit board 8 is provided with an amplifying module, a receiving terminal signal conversion module and a receiving terminal network transformation module which are connected in sequence, the receiving terminal signal conversion module is connected with a receiving terminal main control management module, the amplifying module is connected with the detector 10, the opening area of the second U-shaped opening 9 is provided with a receiving terminal base 11 fixedly connected with the receiving terminal circuit board 8, the receiving terminal base 11 is provided with a second through hole 12 with internal threads, a receiving terminal, the receiving end lens barrel 13 is in threaded connection with the receiving end base 11, a focusing lens 14 is arranged in the receiving end lens barrel 13, and the receiving end lens barrel 13 is coaxially fixed with the detector 10;
the transmitting end base 4 and the receiving end base 11 are coaxial.
The collimating lens 7 can move in the transmitting end lens barrel 6, so that the distance between the collimating lens 7 and the laser 3 can be adjusted, the divergence angle of the space optical signal light beam can be adjusted, the receiving power of the receiving end detector 10 can be sufficient under different distances, and the device is suitable for various communication distances.
The transmitting end base 4 and the receiving end base 11 are coaxial, the tolerance is +/-0.05 mm, and the deviation of the parallelism of the spatial light signal direction emitted by the transmitting end and the normal of the light-emitting surface of the transmitting end base 11 is less than 1 degree.
The transmitting end and the receiving end are respectively provided with a transmitting end power supply module 15 and a receiving end power supply module 16 which provide energy for the transmitting end circuit board 1 and the receiving end circuit board 8.
The UDP protocol Ethernet signal of the outer network firstly flows into the transmitting terminal network voltage transformation module, the transmitting terminal network voltage transformation module completes external high voltage isolation, clutter suppression and waveform recovery are realized on the signal, then the signal flows into the transmitting terminal signal conversion module, the Ethernet signal is converted into a serial data signal of TTL level, the serial data signal of TTL level flows into the driving module, and the driving module senses the signal so as to drive the laser 3 to emit light.
After the detector 10 receives the optical signal, the detector 10 converts the intensity change of the input light beam into corresponding weak current change, the current signal is amplified by the amplification module to become a serial TTL level signal, and then the serial TTL level signal becomes a network electrical signal after passing through the receiving end signal conversion module, and is boosted by the receiving end network voltage transformation module and then led into the intranet to become an ethernet signal.
The UDP protocol Ethernet signal of the outer network flows in from the sending end, is converted into a space optical signal with a specific direction by the sending end, flows into the receiving end through the transmission of an atmospheric channel, is converted into an electric signal by the receiving end, and finally flows into the inner network, so that the one-way transmission function of the signal is realized.
In this example, the transmitting terminal network transformation module is TRC5004, the transmitting terminal signal conversion module is 88E1111, the transmitting terminal main control management module is XC3S250E-4VQ100, the driving module is MAX3738, and the type of the laser is YJT-02D31W10-CN 18-I35.
In this example, the amplifying module is ADN2813, the receiving end signal conversion module is 88E1111, the receiving end main control management module is XC3S250E-4VQ100, the receiving end network transformation module is TRC5004, and the type of the detector is XSJ20T-2570-5 AB-E112.
The functions of the circuit modules and the optical modules when the laser shutter is in operation are described as follows:
and the sending end power supply module is used for supplying power to the internal module and converting external power supply into a level suitable for the internal module of the sending end.
And the transmitting terminal network voltage transformation module is used for level coupling of external Ethernet signals, isolating and protecting internal modules such as the signal conversion module and the transmitting terminal main control management module, and improving the anti-interference capability of the internal modules.
And the sending end signal conversion module is used for converting the Ethernet signals into serial signals.
And the sending end main control management module is used for monitoring the working state of the signal conversion module and carrying out signal management.
And the driving module is used for driving the laser to normally work, providing working current for the laser and converting the electric signal input by the signal conversion module into a modulation signal suitable for the laser to work.
And the laser is used for electro-optical conversion and converting the modulation signal input by the driving module into a space optical signal.
And the transmitting end optical module is used for carrying out optical processing on the transmitted space optical signal and controlling the divergence angle of the light beam.
And the receiving end power supply module is used for supplying power to the internal module and converting external power supply into a level suitable for the internal module of the receiving end.
And the receiving end optical module is used for receiving the space optical signal and focusing the space optical signal on a photosensitive surface of the detector.
And the detector is used for photoelectric conversion, and converting the received focusing space optical signal into a current signal for subsequent electrical processing.
And the amplifying module is used for amplifying the converted photoelectric signal. The amplifying module comprises a pre-amplifying circuit and a main amplifying circuit, wherein the pre-amplifying circuit is used for directly amplifying photoelectric signals converted by the detector so as to improve the signal-to-noise ratio, and the main amplifying circuit is used for amplifying output signals of the pre-amplifying circuit.
And the receiving end signal conversion module is used for converting the serial signals into Ethernet signals.
And the receiving end main control management module is used for monitoring the working state of the signal conversion module and performing signal management.
And the receiving end network voltage transformation module is used for boosting to couple the level of an external Ethernet signal, isolating and protecting internal modules such as the signal conversion module and the main control management module, and improving the anti-interference capability of the internal modules.
And (3) signal transmission process: the UDP protocol Ethernet signal of the external network firstly flows into the network voltage transformation module of the sending end, the network voltage transformation module completes the isolation of external high voltage and realizes clutter suppression and waveform recovery on the signal. Then the signal flows into the signal conversion module of the sending end, and the Ethernet signal is converted into a serial data signal of TTL level.
The sending end main control management module completes hardware configuration on the sending end signal conversion module in work, mainly completes configuration of a chip register of the sending end signal conversion module to enable the sending end signal conversion module to work normally, monitors working states of all circuit units and gives corresponding indication signals. The TTL level serial data signal output by the sending end signal conversion module flows into the driving module subsequently, and the driving module has the main functions of providing working current for the laser, driving the laser to emit light and realizing the electric/optical conversion of communication data. The laser driving circuit has high requirements on the modulation rate and the driving current, wherein the modulation rate is represented by the rising/falling time of an optical signal, and the driving current is represented by the optical power. The laser is an active device, the light emission of the laser needs a certain current condition, which is called as threshold current, when the driving current of the laser is larger than the threshold current, the laser emits light, otherwise, when the driving current is smaller than the threshold current, the laser does not emit light or emits extremely weak light, in order to realize high modulation rate, when the system is normally powered up, the driving circuit firstly provides a bias current which is approximately equal to the threshold current for the laser to enable the laser to be in a quasi-light emitting state, when the electric signal is in a level of '1', the driving circuit adds a modulation current to the laser to enable the laser to emit light, when the electric signal is in a level of '0', the driving circuit does not provide the modulation current, and the laser does not emit light, thereby realizing the rapid modulation of the laser. The signal light emitted by the laser is expanded and collimated by the optical module at the transmitting end to become a space light signal, and the space light signal is transmitted by an atmospheric channel and then focused on the detector by the optical module at the receiving end to be received.
The detector converts the intensity change of the input light beam into corresponding weak current change, the current signal is amplified by the amplification module to become a serial TTL level signal, then, under the configuration and monitoring of the receiving end main control management module, the serial signal becomes a network electric signal after passing through the receiving end signal conversion module, and is boosted by the receiving end network voltage transformation module and then led into the intranet to become an Ethernet signal, so that the information lead-in from the external network to the intranet is realized.
The laser shutter has the following technical characteristics:
unidirectional data transmission: the Ethernet signals input by the external network adopt UDP protocol, the data flow direction in the sending end and the receiving end is one-way circulation, and the receiving end does not need to feed back handshake signals to the sending end during communication.
Physical isolation: infrared laser is used as an information carrier, atmosphere is used as a transmission medium, and a sending end is connected with a receiving end without a physical cable.
High safety: the laser at the sending end emits optical signals after being excited, the detector receives the laser signals and converts the optical signals into electric signals, the two processes are independent, the function of the device is single, and the condition that the sending end has no laser receiving capability and the receiving end has no laser emitting capability is guaranteed.
The communication distance is adjustable: the distance between the collimating lens and the laser can be adjusted by adjusting the threaded lens barrel at the sending end, and the purpose of adjusting the divergence angle of the space optical signal light beam is achieved, so that the receiving power of the detector at the receiving end is sufficient at different distances, and the device is applicable to various communication distances.
Assembling repeatability: the design and machining tolerance of the optical module at the transmitting end and the optical module at the receiving end are controlled to be +/-0.05 mm, the assembly coaxiality of the threaded base, the collimating lens and the laser is high, and the deviation of the parallelism between the direction of a space optical signal emitted by the transmitting end and the normal of the light-emitting surface of the base at the transmitting end is less than 1 degree without precise assembly.
Anti-interception: the spatial light signal has high directivity, small divergence angle, concentrated light beam, no side lobe and tail lobe, very small covered space in the transmission path and the communication end, difficult interception of the light signal and high stealing difficulty.
Anti-electromagnetic interference: the wireless optical communication carrier frequency is distributed above 190THz, so that common electromagnetic waves can not interfere with the wireless optical communication carrier frequency, and the wireless optical communication carrier frequency can normally work in a complex electromagnetic environment and under a strong electromagnetic strip and can not interfere with each other.
Claims (4)
1. A laser shutter comprising a transmitting end and a receiving end, wherein,
the transmitting end comprises a transmitting end circuit board, the transmitting end circuit board is a plate-shaped body with a first U-shaped opening at one end, the outer area of the first U-shaped opening is symmetrically distributed, a laser is arranged at the center of the bottom of the opening of the first U-shaped opening, a transmitting end network voltage transformation module, a transmitting end signal conversion module and a driving module which are sequentially connected are arranged on the transmitting end circuit board, the transmitting end signal conversion module is connected with a transmitting end main control management module, the driving module is connected with the laser, a transmitting end base fixedly connected with the transmitting end circuit board is arranged in the opening area of the first U-shaped opening, the transmitting end base is provided with a first through hole with internal threads, a transmitting end lens cone with external threads is arranged in the first through hole, the transmitting end lens cone is in threaded connection with the transmitting end base, a collimating lens is;
the receiving end comprises a receiving end circuit board, the receiving end circuit board is a plate-shaped body with a second U-shaped opening at one end, the outer area of the second U-shaped opening is symmetrically distributed, the opening direction of the second U-shaped opening is over against the opening direction of a first U-shaped opening on the transmitting end circuit board, the central position of the bottom of the second U-shaped opening is provided with a detector, the receiving end circuit board is provided with an amplifying module, a receiving end signal conversion module and a receiving end network transformation module which are sequentially connected, the receiving end signal conversion module is connected with a receiving end main control management module, the amplifying module is connected with the detector, the opening area of the second U-shaped opening is provided with a receiving end base fixedly connected with the receiving end circuit board, the receiving end base is provided with a second through hole with internal threads, a receiving end lens barrel with external threads is arranged in the second through hole, a focusing lens is arranged in the receiving end lens barrel, and the receiving end lens barrel is coaxially fixed with the detector;
the transmitting end base and the receiving end base are coaxial.
2. The laser shutter of claim 1, wherein the collimating optic is movable within the sending end barrel such that the distance of the collimating optic from the laser is adjustable.
3. The laser shutter of claim 1, wherein the transmitter base and the receiver base are coaxial with a tolerance of ± 0.05mm, and the spatial light signal emitted from the transmitter is directed with a deviation of less than 1 ° from the normal of the light-emitting surface of the transmitter base.
4. The laser shutter of claim 1, wherein the transmitter and receiver are configured with a transmitter power module and a receiver power module, respectively, for powering the transmitter circuit board and the receiver circuit board.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011561233.0A CN112436891B (en) | 2020-12-25 | Laser optical gate |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011561233.0A CN112436891B (en) | 2020-12-25 | Laser optical gate |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112436891A true CN112436891A (en) | 2021-03-02 |
| CN112436891B CN112436891B (en) | 2024-05-31 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113014583A (en) * | 2021-02-26 | 2021-06-22 | 中国电子科技集团公司第五十四研究所 | Laser optical shutter |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001197007A (en) * | 2000-01-11 | 2001-07-19 | Canon Inc | Bidirectional optical spatial transmission device |
| JP2007136478A (en) * | 2005-11-16 | 2007-06-07 | V Technology Co Ltd | Laser generator |
| US20180227050A1 (en) * | 2017-02-08 | 2018-08-09 | Sensors Unlimited, Inc. | Free space optical communication |
| CN214154519U (en) * | 2020-12-25 | 2021-09-07 | 中国电子科技集团公司第三十四研究所 | Laser optical shutter |
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001197007A (en) * | 2000-01-11 | 2001-07-19 | Canon Inc | Bidirectional optical spatial transmission device |
| JP2007136478A (en) * | 2005-11-16 | 2007-06-07 | V Technology Co Ltd | Laser generator |
| US20180227050A1 (en) * | 2017-02-08 | 2018-08-09 | Sensors Unlimited, Inc. | Free space optical communication |
| CN214154519U (en) * | 2020-12-25 | 2021-09-07 | 中国电子科技集团公司第三十四研究所 | Laser optical shutter |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113014583A (en) * | 2021-02-26 | 2021-06-22 | 中国电子科技集团公司第五十四研究所 | Laser optical shutter |
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