CN110943776A - Testing device and method for laser attack optical isolator and circulator in quantum communication system - Google Patents
Testing device and method for laser attack optical isolator and circulator in quantum communication system Download PDFInfo
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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
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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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- 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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Abstract
The invention discloses a testing device and a testing method for laser attacking an optical isolator and a circulator in a quantum communication system. The invention can test the isolation protection effect of the optical isolator and the circulator on the light source end of the quantum secret communication system.
Description
Technical Field
The invention relates to a test scheme for attacking an optical isolator and a circulator by laser, in particular to a light path for the test scheme and a related test method.
Background
Since the first quantum cryptography communication protocol appeared in 1984, the field of quantum communication has rapidly developed, and great progress has been made both theoretically and technically. Currently, worldwide, the american intercontinental quantum network, the uk quantum network, the european union quantum network, the tokyo quantum network, the korean circulant quantum network have been built and are being extended. In China, the Jing Hu trunk line has been checked and accepted in 2017, the Moozi quantum satellite is already in operation, and the Huhang trunk line and the Ningsu trunk line are being constructed. These results indicate that quantum secure communications are gaining more and more popularity.
However, a great part of the factors promoting the technical progress is the progress of the attack mode. In a sense, the development of attacking approaches to existing systems has prompted further development in theory and engineering. There is a specific attack mode, which damages the optical isolator by laser injection to achieve the purpose of stealing secret information of quantum communication. The present invention is a measurement method for detecting the attack effect, i.e. the isolation variation, in the attack mode, and more precisely, an optical path and a related test method for realizing the measurement. In a light source device, the opto-isolator is typically the last optic that the light pulse passes through before being sent to the quantum channel, however, for an attacker Eve looking at the source device from the network side, the opto-isolator is the first component it sees. Therefore, the laser of the attacker Eve may first have an impact on the performance of the optical isolator. The optical characteristics of the optical path of the circulator, which is an optical device for changing the optical path, are also equivalent to an optical isolator, and similarly, the performance of the circulator is affected by the high-power laser irradiated to the light source through the output optical fiber. However, no test scheme exists at present for the optical isolator and the circulator to influence the isolation performance under the irradiation of high-power laser.
Disclosure of Invention
The purpose of the invention is as follows: in order to overcome the defects in the prior art, the invention provides a testing device and a testing method for laser attacking an optical isolator and a circulator in a quantum communication system, so as to verify the isolation protection effect of the optical isolator and the circulator on the optical source end of the quantum secret communication system.
The technical scheme is as follows: in order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a testing arrangement of laser attack optical isolator among quantum communication system, includes first test laser, first optical power meter one, first optical power meter two, first optical power meter three, first 95:5 beam splitter, optical isolator, first 99:1 beam splitter, first high energy laser, first optic fibre fusing detector, wherein:
the first test laser is aligned with a first 95:5, port one of the splitter, and the first optical power meter is connected with a first 95:5, connecting a third port of the beam splitter, wherein one end of the optical isolator is connected with a first 95:5, a second port of the beam splitter is connected, and the other end of the optical isolator is connected with a first 99:1 port one connection of the splitter.
The first high energy laser is connected with a first 99:1, port two of the splitter, and the first optical power meter two is connected with the first 99:1, port three of the splitter, and the first optical power meter three is connected to the first 99:1 port four of the splitter is connected.
The first 95: port one, first 95:5, port two of the splitter is 95% port, the first 95: port three, first 95: port four of the 5 splitter is a 5% port. First 99:1 port one, first 99:1 splitter port two is 99% port, first 99:1 port three, first 99: port four of the 1 splitter is a 1% port.
The first optical fiber fusing detector one end sensor is clamped between a first 99:1 port side of the beam splitter, the other end sensor is clamped in a first 99:1, the first optical fiber fusing detector is connected with the power supply control of the first high-energy laser.
Preferably: the first 95: and 5, a first light cap is arranged on the port IV of the beam splitter.
A test method for laser attack on an optical isolator in a quantum communication system comprises the following steps:
And 3, increasing the power of the first high-energy laser to generate 300mW strong laser, attacking the optical isolator by applying at least 10s, then closing the optical isolator, recording the laser power of the strong laser emitted from the optical isolator by a first optical power meter, and recording the laser power of the strong laser as a first attack power I, and recording the laser power of the strong laser by a second optical power meter, and recording the laser power as a second attack power II. And (4) subtracting 19 times of the first attack power one from 99 times of the first attack power two to calculate an isolation value after the attack, and recording the isolation value as an isolation value under the attack.
And 4, if the initial isolation value and the isolation value under the attack are not subjected to isolation change, increasing the power of the first high-energy laser by 0.5-1dBm, and repeating the step 3. Once the isolation change is detected to 3dB, the high-power laser test is stopped. The high-energy laser test will also stop if a maximum first high-energy laser power of 9W is applied without a change in isolation.
And 5, if any one end sensor of the first optical fiber fusing detector detects that the optical fiber is fused, the first optical fiber fusing detector cuts off the power supply of the first high-energy laser.
And 6, after the high-energy laser test is stopped, opening the first test laser, observing the first monitoring power again through the third optical power meter, and if the power value is the same as that in the step 1 and the isolation change detected in the step 4 is not less than 3dB, successfully testing the attack. Otherwise, the attack test fails.
Preferably: if the optical isolator is observed to heat up during high power laser irradiation and requires time to cool down, a temporary change in the isolation of the sample is recorded during this period. Then, after complete cooling to room temperature, a permanent change in the isolation was recorded.
A testing device for a laser attack circulator in a quantum communication system comprises a first second testing laser, a second testing laser, a first second optical power meter, a second optical power meter, a third second optical power meter, a fourth second optical power meter and a second 95:5 beam splitter, circulator, second 50:50 beam splitter, second 99:1 beam splitter, second high energy laser, second optic fibre fuse detector, wherein:
the second test laser first and second 95:5 port one connection of the beam splitter, and the second optical power meter one and the second 95:5 port three of the splitter, port one of the circulator and second 95: and 5, connecting the second port of the beam splitter.
Ports three and 99:1 port one connection of a beam splitter, the second high-energy laser being connected to a second 99:1, port two of the splitter, and the second optical power meter is connected with the second 99:1, port three of the splitter, and the second optical power meter three is connected to the second 99:1 port four of the splitter is connected.
Ports two and 50: port two of the 50 beam splitter is connected, and the second test laser is connected with the second 50: port one of the 50 beam splitters is connected, and the second optical power meter is connected with the second 50: port three of the 50 splitter is connected.
The second 95:5 ports one, second 95: port two of the 5-splitter is a 95% port, and the second 95: port three, second 95 of 5 beam splitter: port four of the 5 splitter is a 5% port. And a second 99:1 port one, second 99: port two of the 1 splitter is a 99% port, the second 99:1 port three, second 99: port four of the 1 splitter is a 1% port. The second 50: port one, second 50: port two, second 50: port three, second 50: port four of the 50 splitter is 50% port.
The second optical fiber fusing detector one end sensor is clamped between a second 99:1 one side of the port of the beam splitter, the other end sensor is clamped between the second 99:1, the second fiber fusing detector is connected with the power supply control of the second high-energy laser.
Preferably: the second 95: and 5, a first second light cap is arranged on the port IV of the beam splitter. The second 50: and a second light cap II is arranged on the port IV of the 50 beam splitter.
A test method for a laser attack circulator in a quantum communication system comprises the following steps:
step one, a second test laser is turned on to generate a first second test laser, and the first second test laser is selected from a second test laser 95:5 port one of the splitter, in second 95:5 under the action of the beam splitter, one beam of the first test laser is transmitted from the second 95:5 the second port of the splitter flows out, enters the first port of the circulator, flows out of the port of the circulator and enters the second 50: port two of the 50 splitter, from the second 50: and emitting the third port of the 50 beam splitters into a fourth optical power meter, recording the power of a first second test laser emitted by a first second test laser through the fourth optical power meter, and recording the power as a first second monitoring power.
Turning off the first second test laser, turning on the second test laser to generate a second test laser, the second test laser being selected from the group consisting of the second 50:50 splitter port one, in the second 50: under the action of the 50 beam splitter, a second test laser beam is transmitted from a second 50: and the second port of the 50 beam splitter flows out, flows in from the second port of the circulator, flows out from the port of the circulator and enters into a 99:1 port one of the splitter, from 99: and 1, a port IV of the beam splitter flows out, enters a second optical power meter III, records the power of a second test laser emitted from a second test laser and records the power as a second monitoring power II.
Step two, closing the first second testing laser and the second testing laser, opening the second high-energy laser to enable the second high-energy laser to generate 100mW second strong laser, applying for at least 10s, and then closing, wherein the second strong laser is selected from 99:1, port two of the splitter, 99:1 under the action of the beam splitter, dividing the laser beam into two beams of second intense laser, and recording the two beams of second intense laser as a first beam of second intense laser and a second beam of second intense laser.
The first and second intense lasers are selected from 99:1, emitting a first port of the beam splitter into a third port of the circulator, and simulating the optical pulse emitted by an attacker Eve in the quantum communication system to damage the circulator. The first beam of second intense laser passes through a second port of the circulator, and part of the first beam of second intense laser enters a second 50: port two of the 50 splitter, from the second 50: and emitting the light beam from the port three of the 50 beam splitters into a second optical power meter four, and recording the power of the first beam of the second intense laser through the second optical power meter four as a second initial power four.
Another portion of the first intense second laser beam exits port one of the circulators into a second 95:5 port two of the splitter, from second 95: and 5, a third port of the beam splitter enters a first second optical power meter, and the power of the first beam of the first strong laser is recorded as a first second initial power through the first second optical power meter.
The second intense second laser light is emitted from 99: and 1, emitting from a third port of the beam splitter to a second optical power meter, recording the laser power of a second beam of second intense laser through the second optical power meter, and recording as a second initial power two.
The initial isolation value is calculated by subtracting 19 times the second initial power one from 99 times the second initial power two, and is noted as the second initial isolation value one. And subtracting 2 times of the fourth second initial power from 99 times of the second initial power to calculate an initial isolation value, and recording the initial isolation value as a second initial isolation value two.
And step three, on the basis of the step two, increasing the power of the first high-energy laser to generate 300mW second strong laser, applying at least 10s to attack the optical isolator, then closing the optical isolator, recording the laser power of a part of the first beam of the second strong laser emitted from the port two of the circulator through a second optical power meter four, recording the laser power of the other part of the first beam of the second strong laser emitted from the port one of the circulator through the second optical power meter four, recording the laser power of the second beam of the second strong laser as a first attack power, and recording the laser power of the second beam of the second strong laser through the second optical power meter two, recording the laser power of the second beam of the second strong laser as a second attack power. And subtracting 19 times of the first second attack power from 99 times of the second attack power to calculate the isolation value under the attack, and recording the isolation value under the second attack as a first isolation value. And subtracting 2 times of the second attack power from 99 times of the second attack power to calculate an isolation value under the attack, and recording the isolation value as a second isolation value under the second attack.
And step four, if the first second initial isolation value and the first isolation value under the second attack do not have isolation change, and meanwhile, the second initial isolation value and the second isolation value under the second attack do not have isolation change, increasing the power of the second high-energy laser by 0.5-1dBm, and repeating the step three. Once the isolation change is detected to 3dB, the high-power laser test is stopped. The high-energy laser test will also stop if a maximum second high-energy laser power of 9W is applied without a change in isolation.
And 5, if any one end sensor of the second optical fiber fusing detector detects that the optical fiber is fused, the second optical fiber fusing detector cuts off the power supply of the second high-energy laser.
And step six, after the high-energy laser test is stopped, opening the first second test laser, and observing the first second monitoring power again through the fourth second optical power meter. And turning off the first second test laser, turning on the second test laser, and observing the second monitoring power II again through the third second optical power meter. And if the first monitoring power and the second monitoring power are the same as those in the first step and the isolation change detected in the fourth step is not less than 3dB, the attack test is successful. Otherwise, the attack test fails.
Preferably: if the circulator is observed to heat up during high power laser irradiation and it takes time to cool down, a temporary change in isolation of the sample is recorded during this period. Then, after complete cooling to room temperature, a permanent change in the isolation was recorded.
Compared with the prior art, the invention has the following beneficial effects:
the invention adopts the laser diode to simulate the signal light, and increases the light line by the beam splitter so as to realize the laser injection and the isolation measurement, thereby being capable of measuring the attack mode of destroying the quantum communication and the effectiveness thereof, and being capable of well testing the isolation protection function of the optical isolator and the circulator on the light source end of the quantum secret communication system.
Drawings
Fig. 1 is a simplified optical path diagram of an attack on an optical isolator.
Fig. 2 is a simplified optical path diagram of the attack on the circulator.
Detailed Description
The present invention is further illustrated by the following description in conjunction with the accompanying drawings and the specific embodiments, it is to be understood that these examples are given solely for the purpose of illustration and are not intended as a definition of the limits of the invention, since various equivalent modifications will occur to those skilled in the art upon reading the present invention and fall within the limits of the appended claims.
A testing device for laser attack optical isolator in quantum communication system is shown in figure 1, and comprises a first testing laser, a first optical power meter I, a first optical power meter II, a first optical power meter III and a first 95:5 beam splitter, optical isolator, first 99:1 beam splitter, first high energy laser, first optic fibre fusing detector, first test laser adopts laser diode, adopts laser diode analog signal light, and increases the circuit of light with the beam splitter thereby realize laser injection and isolation measurement, and so-called laser diode analog signal light is exactly with optical fiber tail 1550nm laser diode, simulates the signal light of 1550nm in the actual system, and this laser provides 5 mW's continuous light, and the circuit of beam splitter increase light means 95 with a 2: 5 beam splitter and a 2 x 2 99:1, first 95:5 beam splitter, first 99:1 beam splitter. The first high-energy laser is selected from a fiber pigtailed laser diode emitting a wave band of 1550.06-1550.14nm, an erbium-doped fiber amplifier (EDFA) using the fiber pigtailed laser diode set to 20mW power as a seed source and used for providing a continuous optical power device of up to 9W, wherein:
the first test laser is aligned with a first 95:5, port one of the splitter, and the first optical power meter is connected with a first 95:5, connecting a third port of the beam splitter, wherein one end of the optical isolator is connected with a first 95:5, a second port of the beam splitter is connected, and the other end of the optical isolator is connected with a first 99:1 port one connection of the splitter. First 95: the port of the 5-beam splitter is a spare port, and a first light cap is installed to prevent light reflection.
The first high energy laser is connected with a first 99:1, port two of the splitter, and the first optical power meter two is connected with the first 99:1, port three of the splitter, and the first optical power meter three is connected to the first 99:1 port four of the splitter is connected.
The first 95: port one, first 95:5, port two of the splitter is 95% port, the first 95: port three, first 95: port four of the 5 splitter is a 5% port. First 99:1 port one, first 99:1 splitter port two is 99% port, first 99:1 port three, first 99: port four of the 1 splitter is a 1% port.
The first optical fiber fusing detector one end sensor is clamped between a first 99:1 port side of the beam splitter, the other end sensor is clamped in a first 99:1, the first optical fiber fusing detector is connected with the power supply control of the first high-energy laser. The first optical fiber fusing detector is used for detecting whether the optical fiber is fused or not, and once the condition is found, the power supply of the first high-energy laser is cut off immediately so as to avoid causing large-area damage.
A method for testing a laser attack optical isolator in a quantum communication system, as shown in fig. 1, which simulates an attack of an attacker on an operating QKD system, comprising the steps of:
And 3, on the basis of the step 2, increasing the power of the first high-energy laser to generate 300mW strong laser, applying at least 10s to attack the optical isolator, then closing the optical isolator, recording the laser power of the strong laser emitted from the optical isolator through a first optical power meter, recording the laser power as a first attack power I, and recording the laser power of the strong laser through a second optical power meter, recording the laser power as a second attack power II. And (4) subtracting 19 times of the first attack power one from 99 times of the first attack power two to calculate an isolation value after the attack, and recording the isolation value as an isolation value under the attack.
And 4, if the initial isolation value and the isolation value under the attack are not subjected to isolation change, increasing the power of the first high-energy laser by 0.5-1dBm, and repeating the step 3. Once the isolation change is detected to 3dB, the high-power laser test is stopped. The high-energy laser test will also stop if a maximum first high-energy laser power of 9W is applied without a change in isolation.
And 5, if any one end sensor of the first optical fiber fusing detector detects that the optical fiber is fused, the first optical fiber fusing detector cuts off the power supply of the first high-energy laser.
Step 6, after the high-energy laser test is stopped, the first test laser is turned on, the first monitoring power is observed again through the first optical power meter III, and if the power value of the first monitoring power is the same as that in the step 1 and the isolation change detected in the step 4 is not less than 3dB, the attack test is successful; otherwise, the attack test fails.
If the optical isolator is observed to heat up during high power laser irradiation and requires time to cool down, a temporary change in the isolation of the sample is recorded during this period. Then, after complete cooling to room temperature, a permanent change in the isolation was recorded.
The circulator test is similar to the optoisolator test except that there are two sets of circulator test lasers, corresponding to the two light sources and the two beam splitters, respectively. The variation of the isolation between the second circulator port and the first circulator port and the variation of the isolation between the third circulator port and the second circulator port are respectively tested.
A testing device for a laser attack circulator in a quantum communication system comprises a first second testing laser, a second testing laser, a first second optical power meter, a second optical power meter, a third second optical power meter, a fourth second optical power meter and a second 95:5 beam splitter, circulator, second 50:50 beam splitter, second 99:1 beam splitter, second high energy laser, second optic fibre fuse detector, wherein:
the second test laser first and second 95:5 port one connection of the beam splitter, and the second optical power meter one and the second 95:5 port three of the splitter, port one of the circulator and second 95:5 port two of the splitter, the second 95: and 5, a first second light cap is arranged on the port IV of the beam splitter to prevent light reflection.
Ports three and 99:1 port one connection of a beam splitter, the second high-energy laser being connected to a second 99:1, port two of the splitter, and the second optical power meter is connected with the second 99:1, port three of the splitter, and the second optical power meter three is connected to the second 99:1 port four of the splitter is connected.
Ports two and 50: port two of the 50 beam splitter is connected, and the second test laser is connected with the second 50: port one of the 50 beam splitters is connected, and the second optical power meter is connected with the second 50: port three of the 50 splitter is connected, and the second 50: and a second light cap II is arranged on the port IV of the 50 beam splitter to prevent light reflection.
The second 95:5 ports one, second 95: port two of the 5-splitter is a 95% port, and the second 95: port three, second 95 of 5 beam splitter: port four of the 5 splitter is a 5% port. And a second 99:1 port one, second 99: port two of the 1 splitter is a 99% port, the second 99:1 port three, second 99: port four of the 1 splitter is a 1% port. The second 50: port one, second 50: port two, second 50: port three, second 50: port four of the 50 splitter is 50% port.
The second optical fiber fusing detector one end sensor is clamped between a second 99:1 one side of the port of the beam splitter, the other end sensor is clamped between the second 99:1, the second fiber fusing detector is connected with the power supply control of the second high-energy laser.
A method for testing a laser attack circulator in a quantum communication system, as shown in fig. 2, comprises the following steps:
step one, a second test laser is turned on to generate a first second test laser, and the first second test laser is selected from a second test laser 95:5 port one of the splitter, in second 95:5 under the action of the beam splitter, one beam of the first test laser is transmitted from the second 95:5 the second port of the splitter flows out, enters the first port of the circulator, flows out of the port of the circulator and enters the second 50: port two of the 50 splitter, from the second 50: and emitting the third port of the 50 beam splitters into a fourth optical power meter, recording the power of a first second test laser emitted by a first second test laser through the fourth optical power meter, and recording the power as a first second monitoring power, wherein the first second monitoring power is the power of the first laser after passing through a 95:5BS circulator (including access loss).
Turning off the first second test laser, turning on the second test laser to generate a second test laser, the second test laser being selected from the group consisting of the second 50:50 splitter port one, in the second 50: under the action of the 50 beam splitter, a second test laser beam is transmitted from a second 50: and the second port of the 50 beam splitter flows out, flows in from the second port of the circulator, flows out from the port of the circulator and enters into a 99:1 port one of the splitter, from 99: and (3) a port IV of the beam splitter 1 flows out, enters a second optical power meter III, records the power of a second test laser emitted from a second test laser and records the power as a second monitoring power II, wherein the second monitoring power II is the power after passing through 50:50BS, a circulator (including access loss) and 99:1 BS.
Step two, closing the first second testing laser and the second testing laser, opening the second high-energy laser to enable the second high-energy laser to generate 100mW second strong laser, applying for at least 10s, and then closing, wherein the second strong laser is selected from 99:1, port two of the splitter, 99:1 under the action of the beam splitter, dividing the laser beam into two beams of second intense laser, and recording the two beams of second intense laser as a first beam of second intense laser and a second beam of second intense laser.
The first and second intense lasers are selected from 99:1, emitting a first port of a beam splitter, emitting the first port into a third port of a circulator, simulating a light pulse emitted by an attacker Eve in a quantum communication system to damage the circulator, enabling a first beam of second strong laser to pass through a second port of the circulator, and enabling a part of the first beam of second strong laser to enter a second 50: port two of the 50 splitter, from the second 50: and emitting the light beam from the port three of the 50 beam splitters into a second optical power meter four, and recording the power of the first beam of the second intense laser through the second optical power meter four as a second initial power four.
Another portion of the first intense second laser beam exits port one of the circulators into a second 95:5 port two of the splitter, from second 95: and 5, a third port of the beam splitter enters a first second optical power meter, and the power of the first beam of the first strong laser is recorded as a first second initial power through the first second optical power meter.
The second intense second laser light is emitted from 99: and 1, emitting from a third port of the beam splitter to a second optical power meter, recording the laser power of a second beam of second intense laser through the second optical power meter, and recording as a second initial power two.
The initial isolation value is calculated by subtracting 19 times the second initial power one from 99 times the second initial power two, and is noted as the second initial isolation value one. And subtracting 2 times of the fourth second initial power from 99 times of the second initial power to calculate an initial isolation value, and recording the initial isolation value as a second initial isolation value two.
And step three, on the basis of the step two, increasing the power of the first high-energy laser to generate 300mW second strong laser, applying at least 10s to attack the optical isolator, then closing the optical isolator, recording the laser power of a part of the first beam of the second strong laser emitted from the port two of the circulator through a second optical power meter four, recording the laser power of the other part of the first beam of the second strong laser emitted from the port one of the circulator through the second optical power meter four, recording the laser power of the second beam of the second strong laser as a first attack power, and recording the laser power of the second beam of the second strong laser through the second optical power meter two, recording the laser power of the second beam of the second strong laser as a second attack power.
And subtracting 19 times of the first second attack power from 99 times of the second attack power to calculate the isolation value under the attack, and recording the isolation value under the second attack as a first isolation value. And subtracting 2 times of the second attack power from 99 times of the second attack power to calculate an isolation value under the attack, and recording the isolation value as a second isolation value under the second attack.
And step four, if the first second initial isolation value and the first isolation value under the second attack do not have isolation change, and meanwhile, the second initial isolation value and the second isolation value under the second attack do not have isolation change, increasing the power of the second high-energy laser by 0.5-1dBm, and repeating the step three. The test was stopped once the isolation variation was detected to reach 3 dB. The test will also stop if a maximum second high-energy laser power of 9W is applied without a change in isolation.
And fifthly, if any one end sensor of the second optical fiber fusing detector detects that the optical fiber is fused, the second optical fiber fusing detector cuts off the power supply of the second high-energy laser.
Step six, after the high-energy laser test is stopped, opening a first second test laser, and observing a first second monitoring power again through a fourth second optical power meter; turning off the first second test laser, turning on the second test laser, and observing the second monitoring power II again through a third second optical power meter; if the first monitoring power and the second monitoring power are the same as those in the first step and the isolation change detected in the fourth step is not less than 3dB, the attack test is successful; otherwise, the attack test fails.
If the circulator is observed to heat up during high power laser irradiation and it takes time to cool down, a temporary change in isolation of the sample is recorded during this period. Then, after complete cooling to room temperature, a permanent change in the isolation was recorded.
The above description is only of the preferred embodiments of the present invention, and it should be noted that: it will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the principles of the invention and these are intended to be within the scope of the invention.
Claims (8)
1. The utility model provides a testing arrangement of laser attack optical isolator among quantum communication system which characterized in that: the method comprises the following steps of firstly testing a laser, firstly measuring a first optical power meter, secondly measuring a second optical power meter, thirdly measuring a third optical power meter and firstly measuring 95:5 beam splitter, optical isolator, first 99:1 beam splitter, first high energy laser, first optic fibre fusing detector, wherein:
the first test laser is aligned with a first 95:5, port one of the splitter, and the first optical power meter is connected with a first 95:5, connecting a third port of the beam splitter, wherein one end of the optical isolator is connected with a first 95:5, a second port of the beam splitter is connected, and the other end of the optical isolator is connected with a first 99:1, connecting a first port of the beam splitter;
the first high energy laser is connected with a first 99:1, port two of the splitter, and the first optical power meter two is connected with the first 99:1, port three of the splitter, and the first optical power meter three is connected to the first 99:1, connecting ports IV of the beam splitter;
the first 95: port one, first 95:5, port two of the splitter is 95% port, the first 95: port three, first 95:5 port four of the beam splitter is a 5% port; first 99:1 port one, first 99:1 splitter port two is 99% port, first 99:1 port three, first 99:1 port four of the beam splitter is a 1% port;
the first optical fiber fusing detector one end sensor is clamped between a first 99:1 port side of the beam splitter, the other end sensor is clamped in a first 99:1, the first optical fiber fusing detector is connected with the power supply control of the first high-energy laser.
2. The testing device for the laser attack optical isolator in the quantum communication system as claimed in claim 1, wherein: the first 95: and 5, a first light cap is arranged on the port IV of the beam splitter.
3. A test method based on the test device for the laser attack optical isolator in the quantum communication system is characterized by comprising the following steps:
step 1, a first test laser is turned on to generate test laser, and the test laser is switched from a first 95:5 splitter port one, in a first 95:5 beam splitter, one test laser beam is transmitted from the first 95:5, the second port of the beam splitter flows out and flows into the optical isolator, and the second port of the beam splitter flows out of the optical isolator and then enters 99:1 port one of the splitter, from 99:1, a port IV of the beam splitter flows out and enters a first optical power meter III, and the first optical power meter III records the power of test laser emitted from a first test laser and records the power as first monitoring power;
step 2, the first test laser is turned off, the first high-energy laser is turned on to generate 100mW intense laser light, the application is carried out for at least 10s, and then the intense laser light is turned off from 99:1, port two of the splitter, 99:1 under the action of a beam splitter, one intense laser beam is transmitted from a 99:1, emitting a first port of a beam splitter into an optical isolator, simulating a light pulse emitted by an attacker Eve in a quantum communication system to damage the optical isolator, and recording the laser power of strong laser emitted from the optical isolator by a first optical power meter, wherein the laser power is recorded as a first initial power I; another intense laser beam is emitted from 99:1, emitting a port III of the beam splitter into a first optical power meter II, recording the laser power of strong laser through the first optical power meter II, and marking as a first initial power II; subtracting 19 times of the first initial power one from 99 times of the first initial power two to calculate an initial isolation value, and recording the initial isolation value as the initial isolation value;
step 3, increasing the power of the first high-energy laser to generate 300mW strong laser, attacking the optical isolator by applying at least 10s, then closing the optical isolator, recording the laser power of the strong laser emitted from the optical isolator by a first optical power meter, recording the laser power as a first attack power I, and recording the laser power of the strong laser by a second optical power meter, recording the laser power as a second attack power; calculating an isolation value after the attack by subtracting 19 times of the first attack power one from 99 times of the first attack power two, and recording the isolation value as an isolation value under the attack;
step 4, if the initial isolation value and the isolation value under attack do not have isolation change, the power of the first high-energy laser is increased by 0.5-1dBm, and the step 3 is repeated; stopping the high-energy laser test once the isolation change reaches 3 dB; the high-energy laser test will also stop if a maximum first high-energy laser power of 9W is applied without a change in isolation;
and 5, if any one end sensor of the first optical fiber fusing detector detects that the optical fiber is fused, the first optical fiber fusing detector cuts off the power supply of the first high-energy laser.
Step 6, after the high-energy laser test is stopped, the first test laser is turned on, the first monitoring power is observed again through the first optical power meter III, and if the power value is the same as that in the step 1 and the isolation change detected in the step 4 is not less than 3dB, the attack test is successful; otherwise, the attack test fails.
4. The test method of claim 3, wherein: if the optical isolator is observed to heat up during high power laser irradiation and requires time to cool down, a temporary change in the isolation of the sample is recorded during this period; then, after complete cooling to room temperature, a permanent change in the isolation was recorded.
5. The utility model provides a testing arrangement of laser attack circulator in quantum communication system which characterized in that: the method comprises a first second test laser, a first second optical power meter, a third second optical power meter, a fourth second optical power meter and a second 95:5 beam splitter, circulator, second 50:50 beam splitter, second 99:1 beam splitter, second high energy laser, second optic fibre fuse detector, wherein:
the second test laser first and second 95:5 port one connection of the beam splitter, and the second optical power meter one and the second 95:5 port three of the splitter, port one of the circulator and second 95:5, connecting a second port of the beam splitter;
ports three and 99:1 port one connection of a beam splitter, the second high-energy laser being connected to a second 99:1, port two of the splitter, and the second optical power meter is connected with the second 99:1, port three of the splitter, and the second optical power meter three is connected to the second 99:1, connecting ports IV of the beam splitter;
ports two and 50: port two of the 50 beam splitter is connected, and the second test laser is connected with the second 50: port one of the 50 beam splitters is connected, and the second optical power meter is connected with the second 50: port three of the 50 beam splitters is connected;
the second 95:5 ports one, second 95: port two of the 5-splitter is a 95% port, and the second 95: port three, second 95 of 5 beam splitter: 5 port four of the beam splitter is a 5% port; and a second 99:1 port one, second 99: port two of the 1 splitter is a 99% port, the second 99:1 port three, second 99:1 port four of the beam splitter is a 1% port; the second 50: port one, second 50: port two, second 50: port three, second 50: the fourth port of the 50 beam splitters is a 50% port;
the second optical fiber fusing detector one end sensor is clamped between a second 99:1 one side of the port of the beam splitter, the other end sensor is clamped between the second 99:1, the second fiber fusing detector is connected with the power supply control of the second high-energy laser.
6. The device for testing the laser attack optical isolator and circulator in the quantum communication system as claimed in claim 1, wherein: the second 95:5 a first light cap is arranged on the port IV of the beam splitter; the second 50: and a second light cap II is arranged on the port IV of the 50 beam splitter.
7. A test method of a test device of a laser attack circulator in a quantum communication system based on the claim 5 is characterized by comprising the following steps:
step one, a second test laser is turned on to generate a first second test laser, and the first second test laser is selected from a second test laser 95:5 port one of the splitter, in second 95:5 under the action of the beam splitter, one beam of the first test laser is transmitted from the second 95:5 the second port of the splitter flows out, enters the first port of the circulator, flows out of the port of the circulator and enters the second 50: port two of the 50 splitter, from the second 50: a third port of the 50 beam splitter emits light into a fourth optical power meter, and the power of a first second test laser emitted by a first second test laser is recorded through the fourth optical power meter and is marked as a first second monitoring power;
turning off the first second test laser, turning on the second test laser to generate a second test laser, the second test laser being selected from the group consisting of the second 50:50 splitter port one, in the second 50: under the action of the 50 beam splitter, a second test laser beam is transmitted from a second 50: and the second port of the 50 beam splitter flows out, flows in from the second port of the circulator, flows out from the port of the circulator and enters into a 99:1 port one of the splitter, from 99:1, a port IV of the beam splitter flows out and enters a second optical power meter III, and the second optical power meter III records the power of a second test laser emitted from a second test laser and records the power as a second monitoring power II;
step two, closing the first second testing laser and the second testing laser, opening the second high-energy laser to enable the second high-energy laser to generate 100mW second strong laser, applying for at least 10s, and then closing, wherein the second strong laser is selected from 99:1, port two of the splitter, 99:1, under the action of a beam splitter, dividing the laser beam into two beams of second strong laser, and recording the two beams of second strong laser as a first beam of second strong laser and a second beam of second strong laser;
the first and second intense lasers are selected from 99:1, emitting a first port of a beam splitter into a third port of a circulator, and simulating a light pulse emitted by an attacker Eve in a quantum communication system to damage the circulator; the first beam of second intense laser passes through a second port of the circulator, and part of the first beam of second intense laser enters a second 50: port two of the 50 splitter, from the second 50: a third port of the 50 beam splitter emits light to a fourth optical power meter, and the power of the first beam of second intense laser is recorded through the fourth optical power meter and is recorded as a fourth initial power;
another portion of the first intense second laser beam exits port one of the circulators into a second 95:5 port two of the splitter, from second 95:5, a third port of the beam splitter enters a first second optical power meter, and the power of the first strong laser beam of the part is recorded through the first second optical power meter and is recorded as a first second initial power;
the second intense second laser light is emitted from 99:1, emitting a third port of the beam splitter into a second optical power meter, recording the laser power of a second beam of second intense laser through the second optical power meter, and recording as a second initial power II;
subtracting 19 times of the first initial power from 99 times of the second initial power to calculate an initial isolation value, and recording the initial isolation value as a first initial isolation value; subtracting 2 times of the second initial power from 99 times of the second initial power to calculate an initial isolation value, and recording the initial isolation value as a second initial isolation value II;
step three, on the basis of the step two, increasing the power of the first high-energy laser to generate 300mW second strong laser, applying at least 10s to attack the optical isolator, then closing the optical isolator, recording the laser power of a part of first beam of second strong laser emitted from the port two of the circulator through a second optical power meter four, recording the laser power of the other part of first beam of second strong laser emitted from the port one of the circulator through the second optical power meter four, recording the laser power of the second beam of second strong laser as a second attack power one, and recording the laser power of the second beam of second strong laser through the second optical power meter two, recording the laser power of the second beam of second strong laser as a second attack power two; subtracting 19 times of the first second attack power from 99 times of the second attack power to calculate an isolation value under attack, and recording the isolation value as a first isolation value under the second attack; subtracting 2 times of the second attack power from 99 times of the second attack power to calculate an isolation value under attack, and recording the isolation value as a second isolation value under attack;
step four, if the first second initial isolation value and the first isolation value under the second attack do not have isolation change, and meanwhile, the second initial isolation value and the second isolation value under the second attack do not have isolation change, the power of the second high-energy laser is increased by 0.5-1dBm, and the step three is repeated; stopping the high-energy laser test once the isolation change reaches 3 dB; the high-energy laser test will also stop if a maximum second high-energy laser power of 9W is applied without a change in isolation;
step five, if any one end sensor of the second optical fiber fusing detector detects that the optical fiber is fused, the second optical fiber fusing detector cuts off the power supply of the second high-energy laser;
step six, after the high-energy laser test is stopped, opening a first second test laser, and observing a first second monitoring power again through a fourth second optical power meter; turning off the first second test laser, turning on the second test laser, and observing the second monitoring power II again through a third second optical power meter; if the first monitoring power and the second monitoring power are the same as those in the first step and the isolation change detected in the fourth step is not less than 3dB, the attack test is successful; otherwise, the attack test fails.
8. The test method of claim 7, wherein: if the temperature of the circulator is observed to rise during the high power laser irradiation and it takes time to cool down, a temporary change in the isolation of the sample is recorded during this period; then, after complete cooling to room temperature, a permanent change in the isolation was recorded.
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