CN113141209A - Device for detecting strong light in transmitting end of quantum communication system - Google Patents
Device for detecting strong light in transmitting end of quantum communication system Download PDFInfo
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- CN113141209A CN113141209A CN202110682548.9A CN202110682548A CN113141209A CN 113141209 A CN113141209 A CN 113141209A CN 202110682548 A CN202110682548 A CN 202110682548A CN 113141209 A CN113141209 A CN 113141209A
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- quantum communication
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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
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/079—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using measurements of the data signal
- H04B10/0795—Performance monitoring; Measurement of transmission parameters
- H04B10/07955—Monitoring or measuring power
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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
- H04B10/70—Photonic quantum communication
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Optics & Photonics (AREA)
- Optical Communication System (AREA)
Abstract
The present invention provides an apparatus for detecting intense light in the transmit end of a quantum communication system, the apparatus comprising: a laser; a light source driving unit configured to drive the laser to output light pulses; an optical encoding unit configured to prepare quantum light including information to be transmitted using light pulses output by a laser; a circulator including a first port, a second port, and a third port and configured to transmit quantum light incident from the first port to the second port to be emitted to a receiving end corresponding to the emitting end while transmitting external strong light incident from the second port to the third port; a photodetector configured to detect an incident light intensity of the external strong light output from the third port; and a controller configured to perform a predetermined protection operation for the quantum communication system in response to the detected intensity of the incident light reaching a reference threshold. The device provided by the invention can effectively detect the attack light possibly existing in the transmitting end of the quantum communication system.
Description
Technical Field
The present invention relates to the field of quantum communication technology, and more particularly, to an apparatus for detecting strong light in a transmitting end of a quantum communication system (such as a quantum key distribution system).
Background
At present, the quantum communication system still suffers from various attacks from the outside during the operation process, for example, the transmitting end of the quantum communication system may suffer from trojan horse attacks from the outside, and such attacks acquire the optical coding information of the transmitting end by injecting strong light into the transmitting end for injection locking, which not only causes the optical coding information to be leaked to an attacker, but also causes damage to various devices and circuits used in the quantum communication system.
Disclosure of Invention
The invention aims to provide a device for detecting strong light in a transmitting end of a quantum communication system.
According to an aspect of the present invention, there is provided an apparatus for detecting strong light in a transmitting end of a quantum communication system, the apparatus comprising: a laser; a light source driving unit configured to drive the laser to output light pulses; an optical encoding unit configured to prepare quantum light including information to be transmitted using light pulses output by a laser; a circulator including a first port, a second port, and a third port, and configured to transmit quantum light incident from the first port to the second port to be emitted to a receiving end corresponding to the emitting end, while transmitting external strong light incident from the second port to the third port; a photodetector configured to detect an incident light intensity of the external strong light output from the third port to obtain an electrical signal corresponding to the external strong light; and a controller configured to perform a predetermined protection operation for the quantum communication system in response to an electrical signal corresponding to external strong light reaching a reference threshold.
According to an embodiment of the invention, the apparatus further comprises: an analog-to-digital conversion unit configured to convert the detected intensity of the incident light from an analog signal to a digital signal and feed back the converted digital signal to the controller.
According to one embodiment of the invention, the predetermined protection operation comprises at least one of: outputting an external strong light attack warning; turning off the light source driving unit; reporting to a network management system; and stopping operation of the quantum communication system.
According to one embodiment of the present invention, the electrical signal corresponding to the external intense light is characterized by a power or a voltage.
The device for detecting the strong light in the transmitting end of the quantum communication system, provided by the invention, not only can effectively detect the attack light possibly existing in the transmitting end of the quantum communication system and prevent the quantum communication system from being continuously attacked or damaged, but also can effectively protect various devices used in the quantum communication system.
Drawings
The above objects and features of the present invention will become more apparent from the following description when taken in conjunction with the accompanying drawings.
Fig. 1 shows a schematic diagram of an apparatus for detecting intense light in a transmitting end of a quantum communication system according to an exemplary embodiment of the present invention.
Fig. 2 shows another schematic diagram of an apparatus for detecting intense light in the transmitting end of a quantum communication system according to an exemplary embodiment of the present invention.
Detailed Description
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.
Fig. 1 shows a schematic diagram of an apparatus for detecting intense light in a transmitting end of a quantum communication system according to an exemplary embodiment of the present invention.
Referring to fig. 1, an apparatus for detecting intense light in an emission end of a quantum communication system according to an exemplary embodiment of the present invention may include at least a laser 101, a light source driving unit 102, an optical encoding unit 103, a circulator 104, a photodetector 105, and a controller 106 (such as, but not limited to, an FPGA, etc.).
In the apparatus for detecting strong light in a transmitting end of a quantum communication system shown in fig. 1, a light source driving unit 102 may be configured to drive a laser 102 to output a light pulse, an optical encoding unit 103 may be configured to prepare quantum light including information to be transmitted using the light pulse output by the laser 101, a circulator 104 may include a first port 1, a second port 2, and a third port 3 and may be configured to transmit quantum light incident from the first port 1 to the second port 2 to be transmitted to a receiving end (not shown) corresponding to the transmitting end, while transmitting the external strong light incident from the second port 2 to the third port 3, the photodetector 105 may be configured to detect an incident light intensity of the external strong light output from the third port 3 to obtain an electrical signal corresponding to the external strong light, and the controller 106 may be configured to perform a predetermined protection operation for the quantum communication system in response to the electrical signal corresponding to the external strong light reaching a reference threshold.
In the apparatus for detecting intense light in the transmitting end of a quantum communication system shown in fig. 1, the predetermined protection operation may include, but is not limited to, one or a combination of the following operations: outputting an external strong light attack warning, turning off a light source driving unit, reporting to a network management system and stopping the operation of the quantum communication system. The electrical signal corresponding to the external intense light may be characterized by such as, but not limited to, power or voltage.
Therefore, the apparatus for detecting strong light in the transmitting end of the quantum communication system shown in fig. 1 can not only effectively detect various attack lights which may exist in the transmitting end of the quantum communication system and prevent the quantum communication system from being attacked or damaged, but also protect various devices and circuits used in the quantum communication system.
Fig. 2 shows another schematic diagram of an apparatus for detecting intense light in the transmitting end of a quantum communication system according to an exemplary embodiment of the present invention.
Referring to fig. 2, the apparatus for detecting strong light in the transmitting end of a quantum communication system according to an exemplary embodiment of the present invention may further include an analog-to-digital conversion unit 107 in addition to the laser 101, the light source driving unit 102, the optical encoding unit 103, the circulator 104, the photodetector 105, and the controller 106, and the analog-to-digital conversion unit 107 may be configured to convert the detected intensity of incident light from an analog signal to a digital signal and feed back the converted digital signal to the controller 106, so that the controller 106 recognizes the magnitude of the intensity of incident light of external strong light. The controller 106 may compare the converted digital signal to a reference threshold to determine whether to perform the predetermined protection operation described above for the quantum communication system.
It should be understood that although fig. 2 shows an example in which the controller is caused to perform the predetermined protection operation for the quantum communication system in response to the electric signal corresponding to the external strong light reaching the reference threshold via a separate analog-to-digital conversion unit, the example is merely illustrative, the present invention is not limited thereto, and the analog-to-digital conversion unit may also be integrated into the controller such that the controller is caused to perform the predetermined protection operation for the quantum communication system in response to the electric signal corresponding to the external strong light reaching the reference threshold.
In an example, the electrical signal corresponding to the external strong light can be characterized by power, and can also be characterized by voltage. Where a voltage is used to characterize the electrical signal corresponding to external strong light, the electrical signal corresponding to weak light (such as quantum light) may typically be 0.5 volts, while the electrical signal corresponding to external strong light may be higher than the electrical signal corresponding to weak light, and thus, the reference threshold may be set to be greater than 0.5 volts (e.g., without limitation, 1.0 volts). As shown in fig. 2, the controller 106 may compare the electrical signal corresponding to the external glare light with a reference threshold, and when the electrical signal corresponding to the external glare light is higher than the reference threshold or continuously higher than the reference threshold for a period of time, the controller 106 may perform a predetermined protection operation for the quantum communication system, such as one or a combination of the following operations as previously described: outputting an external strong light attack warning, turning off a light source driving unit, reporting to a network management system and stopping the operation of the quantum communication system.
It can be seen that the implementation process can effectively defend the attack of strong light from the outside on the quantum communication system, so that the operation of the quantum communication system is safely guaranteed.
While the present application has been shown and described with reference to preferred embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to these embodiments without departing from the spirit and scope of the present application as defined by the following claims.
Claims (4)
1. An apparatus for detecting intense light in an emitter of a quantum communication system, the apparatus comprising:
a laser;
a light source driving unit configured to drive the laser to output light pulses;
an optical encoding unit configured to prepare quantum light including information to be transmitted using light pulses output by a laser;
a circulator including a first port, a second port, and a third port, and configured to transmit quantum light incident from the first port to the second port to be emitted to a receiving end corresponding to the emitting end, while transmitting external strong light incident from the second port to the third port;
a photodetector configured to detect an incident light intensity of the external strong light output from the third port to obtain an electrical signal corresponding to the external strong light; and
a controller configured to perform a predetermined protection operation on the quantum communication system in response to an electrical signal corresponding to external strong light reaching a reference threshold.
2. The apparatus of claim 1, further comprising:
an analog-to-digital conversion unit configured to convert the detected intensity of the incident light from an analog signal to a digital signal and feed back the converted digital signal to the controller.
3. The apparatus of claim 1, wherein predetermined protection operations comprise at least one of:
outputting an external strong light attack warning;
turning off the light source driving unit;
reporting to a network management system; and
and stopping the operation of the quantum communication system.
4. The device of claim 1, wherein the electrical signal corresponding to the external intense light is characterized by power or voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682548.9A CN113141209A (en) | 2021-06-21 | 2021-06-21 | Device for detecting strong light in transmitting end of quantum communication system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110682548.9A CN113141209A (en) | 2021-06-21 | 2021-06-21 | Device for detecting strong light in transmitting end of quantum communication system |
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| CN113141209A true CN113141209A (en) | 2021-07-20 |
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| CN202110682548.9A Withdrawn CN113141209A (en) | 2021-06-21 | 2021-06-21 | Device for detecting strong light in transmitting end of quantum communication system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090232513A1 (en) * | 2007-01-09 | 2009-09-17 | Akihito Otani | Optical signal synchronization sampling apparatus and method, and optical signal monitoring apparatus and method using the same |
| US20090268901A1 (en) * | 2004-12-15 | 2009-10-29 | Thales | Continuous variable quantum encryption key distribution system |
| US20100195831A1 (en) * | 2007-07-13 | 2010-08-05 | Akihiro Tanaka | Quantum key distribution system, optical transmitter, optical modulation control circuit, and optical modulation control method |
| US20170237505A1 (en) * | 2016-02-16 | 2017-08-17 | Kabushiki Kaisha Toshiba | Optical device, a transmitter for a quantum communication system and a quantum communication system |
| CN107566043A (en) * | 2017-09-15 | 2018-01-09 | 北京中创为量子通信技术有限公司 | A kind of quantum key transmitting terminal, receiving terminal, system and method |
| CN110830121A (en) * | 2019-11-01 | 2020-02-21 | 国开启科量子技术(北京)有限公司 | Classical channel and quantum channel wavelength division multiplexing system and method |
-
2021
- 2021-06-21 CN CN202110682548.9A patent/CN113141209A/en not_active Withdrawn
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090268901A1 (en) * | 2004-12-15 | 2009-10-29 | Thales | Continuous variable quantum encryption key distribution system |
| US20090232513A1 (en) * | 2007-01-09 | 2009-09-17 | Akihito Otani | Optical signal synchronization sampling apparatus and method, and optical signal monitoring apparatus and method using the same |
| US20100195831A1 (en) * | 2007-07-13 | 2010-08-05 | Akihiro Tanaka | Quantum key distribution system, optical transmitter, optical modulation control circuit, and optical modulation control method |
| US20170237505A1 (en) * | 2016-02-16 | 2017-08-17 | Kabushiki Kaisha Toshiba | Optical device, a transmitter for a quantum communication system and a quantum communication system |
| CN107566043A (en) * | 2017-09-15 | 2018-01-09 | 北京中创为量子通信技术有限公司 | A kind of quantum key transmitting terminal, receiving terminal, system and method |
| CN110830121A (en) * | 2019-11-01 | 2020-02-21 | 国开启科量子技术(北京)有限公司 | Classical channel and quantum channel wavelength division multiplexing system and method |
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