CN114884570A - Optical fiber eavesdropping detection method and device - Google Patents
Optical fiber eavesdropping detection method and device Download PDFInfo
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- CN114884570A CN114884570A CN202210681437.0A CN202210681437A CN114884570A CN 114884570 A CN114884570 A CN 114884570A CN 202210681437 A CN202210681437 A CN 202210681437A CN 114884570 A CN114884570 A CN 114884570A
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- 239000013307 optical fiber Substances 0.000 title claims abstract description 75
- 238000001514 detection method Methods 0.000 title abstract description 16
- 230000003287 optical effect Effects 0.000 claims abstract description 201
- 239000000835 fiber Substances 0.000 claims abstract description 61
- 238000005452 bending Methods 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 24
- 230000003595 spectral effect Effects 0.000 claims abstract description 20
- 230000008859 change Effects 0.000 claims abstract description 11
- 230000005540 biological transmission Effects 0.000 claims description 83
- 238000001228 spectrum Methods 0.000 claims description 24
- 238000012806 monitoring device Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 238000004891 communication Methods 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—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
- H04B10/80—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
Abstract
The application discloses an optical fiber eavesdropping detection method and device, and the method inserts long-wavelength reference pulse light and short-wavelength reference pulse light outside a service bandwidth and detects a power change curve of a Rayleigh scattering signal of the corresponding reference pulse light. By comparing the dynamic changes of the power change curves of the Rayleigh scattering signals of the two reference pulse lights in real time, when the power change curve of the long-wavelength Rayleigh scattering signal generates an attenuation point with a obviously larger power change curve of the short-wavelength Rayleigh scattering signal, the risk of bending eavesdropping of the optical fiber is determined, and the position with the risk of bending eavesdropping is determined based on the position corresponding to the attenuation point. The traffic channel may also be monitored over the optical channel, the spectral profile determined, and the risk of bending eavesdropping of the fiber determined based on the spectral profile.
Description
Technical Field
The present disclosure relates to the field of optical fiber monitoring technologies, and more particularly, to a method and an apparatus for detecting optical fiber eavesdropping.
Background
Optical fiber is a main optical signal transmission medium for long-distance communication, is commonly used for data interconnection of 500 meters to dozens of kilometers, and can realize data transmission of thousands of kilometers through optical power relay.
The optical fiber is a silica glass-based flexible waveguide, lawless persons usually make a part of optical signals leak from the side wall part of the optical fiber by bending the optical fiber with a small radius, so that information eavesdropping is realized, and normal communication cannot be interrupted during eavesdropping, so that the eavesdropping is not easy to perceive.
Therefore, how to determine whether there is eavesdropping on the optical fiber becomes an urgent problem to be solved.
Disclosure of Invention
In view of the above, the present application provides a method and an apparatus for detecting an optical fiber eavesdropping, so as to efficiently and accurately detect the possible eavesdropping of the optical fiber.
In order to achieve the above object, the following solutions are proposed:
a fiber optic eavesdropping detection method comprising:
acquiring a target signal from a transmission optical fiber;
acquiring a long-wavelength target signal and a short-wavelength target signal from the target signal;
determining a power variation amount of the long-wavelength target signal based on the long-wavelength target signal, and determining a power variation amount of the short-wavelength target signal based on the short-wavelength target signal;
and if the power variation of the long-wavelength target signal is larger than that of the short-wavelength target signal, determining that the transmission optical fiber has the risk of bending and eavesdropping.
Optionally, the acquiring a target signal from a transmission fiber includes:
periodically generating a long wavelength pulsed reference optical signal and a short wavelength pulsed reference optical signal, the wavelength of the long wavelength pulsed reference optical signal and the wavelength of the short wavelength pulsed reference optical signal not being within a wavelength range of a service optical signal in a transmission fiber;
combining the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal and the service optical signal to obtain a first combined signal, and sending the first combined signal to the transmission optical fiber;
obtaining a Rayleigh scattering signal corresponding to the first combined signal from the transmission optical fiber;
the acquiring long-wavelength target signals and short-wavelength target signals from the target signals comprises:
and separating a long-wavelength Rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength Rayleigh scattering signal generated by the short-wavelength pulse reference optical signal from Rayleigh scattering signals corresponding to the first combined signal.
Optionally, the determining a power variation of the long-wavelength target signal based on the long-wavelength target signal, and determining a power variation of the short-wavelength target signal based on the short-wavelength target signal include:
determining a first variation curve based on the long-wavelength Rayleigh scattering signal, wherein the first variation curve represents the variation trend of the power of the long-wavelength Rayleigh scattering signal along with the time;
determining a second variation curve based on the short-wavelength Rayleigh scattering signal, wherein the second variation curve represents the variation trend of the power of the short-wavelength Rayleigh scattering signal along with the variation of time;
if the first change curve has a power attenuation position, determining a power variation corresponding to the power attenuation position;
and determining the power variation of the corresponding position of the time corresponding to the power attenuation position in the second variation curve.
Optionally, the method further includes:
determining the length of the optical fiber based on the time corresponding to the power attenuation position and the propagation speed of the light speed in the transmission optical fiber;
based on the fiber length, a location in the transmission fiber where a risk of bending eavesdropping exists is determined.
Optionally, the acquiring a target signal from a transmission fiber includes:
acquiring a current part of service optical signals from the transmission optical fiber;
the acquiring long-wavelength target signals and short-wavelength target signals from the target signals comprises:
and acquiring a long-wavelength service optical signal and a short-wavelength service optical signal from the current part of service optical signals.
Optionally, the determining a power variation of the long-wavelength target signal based on the long-wavelength target signal, and determining a power variation of the short-wavelength target signal based on the short-wavelength target signal include:
determining a current spectral curve based on the current part of service optical signals, wherein the current spectral curve represents the corresponding relation between current service optical signals with different wavelengths and power information thereof;
acquiring a historical spectrum curve, wherein the historical spectrum curve represents the corresponding relation between historical service optical signals with different wavelengths and power information of the historical service optical signals;
and comparing the current spectrum curve with the historical spectrum curve, and determining the power variation of the long-wavelength service optical signal and the power variation of the short-wavelength service optical signal.
A fiber optic eavesdropping detecting device comprising:
the first acquisition module is used for acquiring a target signal from the transmission optical fiber;
the second acquisition module is used for acquiring a long-wavelength target signal and a short-wavelength target signal from the target signal;
a first determining module, configured to determine a power variation of the long-wavelength target signal based on the long-wavelength target signal, and determine a power variation of the short-wavelength target signal based on the short-wavelength target signal;
and the second determining module is used for determining that the transmission optical fiber has the risk of bending and wiretapping if the power variation of the long-wavelength target signal is larger than that of the short-wavelength target signal.
Optionally, the first obtaining module is specifically configured to:
periodically generating a long wavelength pulsed reference optical signal and a short wavelength pulsed reference optical signal, the wavelength of the long wavelength pulsed reference optical signal and the wavelength of the short wavelength pulsed reference optical signal not being within a wavelength range of a service optical signal in a transmission fiber;
combining the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal and the service optical signal to obtain a first combined signal, and sending the first combined signal to the transmission optical fiber;
obtaining a Rayleigh scattering signal corresponding to the first combined signal from the transmission optical fiber;
the acquiring long-wavelength target signals and short-wavelength target signals from the target signals comprises:
and separating a long-wavelength Rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength Rayleigh scattering signal generated by the short-wavelength pulse reference optical signal from Rayleigh scattering signals corresponding to the first combined signal.
Optionally, the first determining module is specifically configured to:
determining a first variation curve based on the long-wavelength Rayleigh scattering signal, wherein the first variation curve represents the variation trend of the power of the long-wavelength Rayleigh scattering signal along with the time;
determining a second variation curve based on the short-wavelength Rayleigh scattering signal, wherein the second variation curve represents the variation trend of the power of the short-wavelength Rayleigh scattering signal along with the time;
if the first change curve has a power attenuation position, determining a power variation corresponding to the power attenuation position;
and determining the power variation of the corresponding position of the time corresponding to the power attenuation position in the second variation curve.
Optionally, the apparatus further comprises:
a third determining module, configured to determine a length of the optical fiber based on a time corresponding to the power attenuation position and a propagation speed of an optical speed in the transmission optical fiber;
a fourth determining module for determining a location in the transmission fiber where there is a risk of bending eavesdropping based on the length of the fiber.
As can be seen from the above technical solution, by acquiring a target signal from a transmission fiber, acquiring a long-wavelength target signal and a short-wavelength target signal from the target signal, determining a power variation amount of the long-wavelength target signal based on the long-wavelength target signal, determining a power variation amount of the short-wavelength target signal based on the short-wavelength target signal, and if the power variation amount of the long-wavelength target signal is larger than the power variation amount of the short-wavelength target signal, it means that the long wavelength target signal generates a larger loss than the short wavelength target signal, the bending of the fiber causes the loss of the long wavelength target signal to be greater than the loss of the short wavelength target signal, and therefore, the method and the device can automatically determine the position of the transmission optical fiber with the risk of bending eavesdropping and the position of the transmission optical fiber with the risk of bending eavesdropping, and ensure that the position of the transmission optical fiber with the risk of bending eavesdropping and the position of the transmission optical fiber with the risk of bending eavesdropping can be efficiently and accurately determined.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only the embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.
Fig. 1 is a schematic flow chart of a fiber optic eavesdropping detection method provided in embodiment 1 of the present application;
fig. 2 is a schematic flowchart of an optical fiber eavesdropping detecting method according to embodiment 2 of the present application;
fig. 3 is a schematic view of an implementation scenario of a fiber optic eavesdropping detection method according to the present application;
fig. 4 is a schematic view of another implementation scenario of a fiber optic eavesdropping detection method provided in the present application;
FIG. 5 is a schematic illustration of a first variation and a second variation provided herein;
fig. 6 is a schematic flowchart of a fiber optic eavesdropping detection method according to embodiment 3 of the present application;
fig. 7 is a schematic flowchart of a fiber optic eavesdropping detection method according to embodiment 4 of the present application;
FIG. 8 is a schematic diagram of a current spectral curve and a historical spectral curve provided herein;
fig. 9 is a schematic structural view of an optical fiber eavesdropping detecting apparatus according to the present application.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort belong to the protection scope of the present application.
In order to make the aforementioned objects, features and advantages of the present application more comprehensible, the present application is described in further detail with reference to the accompanying drawings and the detailed description.
Referring to fig. 1, a flow chart of a fiber optic eavesdropping detection method provided in embodiment 1 of the present application is schematically illustrated, the method may be applied to an electronic device, and the product type of the electronic device is not limited in the present application, and as shown in fig. 1, the method may include, but is not limited to, the following steps:
and step S11, acquiring a target signal from the transmission optical fiber.
And step S12, acquiring a long-wavelength target signal and a short-wavelength target signal from the target signal.
It will be appreciated that the wavelength of the long wavelength target signal is longer than the wavelength of the short wavelength target signal.
Step S13, determining a power variation of the long-wavelength target signal based on the long-wavelength target signal, and determining a power variation of the short-wavelength target signal based on the short-wavelength target signal.
And step S14, if the power variation of the long-wavelength target signal is larger than that of the short-wavelength target signal, determining that the transmission fiber is at risk of bending and eavesdropping.
If the power variation of the long-wavelength target signal is larger than that of the short-wavelength target signal, it is indicated that the loss generated by the long-wavelength target signal is larger than that generated by the short-wavelength target signal, and the loss generated by the long-wavelength target signal is larger than that generated by the short-wavelength target signal due to the bending of the optical fiber, so that the risk of bending and eavesdropping of the transmission optical fiber can be determined.
In this embodiment, the target signal is obtained from the transmission fiber, the long-wavelength target signal and the short-wavelength target signal are obtained from the target signal, the power variation of the long-wavelength target signal is determined based on the long-wavelength target signal, the power variation of the short-wavelength target signal is determined based on the short-wavelength target signal, and if the power variation of the long-wavelength target signal is greater than the power variation of the short-wavelength target signal, it indicates that the loss generated by the long-wavelength target signal is greater than the loss generated by the short-wavelength target signal, and the fiber bending causes the loss generated by the long-wavelength target signal to be greater than the loss generated by the short-wavelength target signal.
As another alternative embodiment 2 of the present application, mainly a refinement of the fiber optic eavesdropping detection method described in the above embodiment 1, as shown in fig. 2, the method may include, but is not limited to, the following steps:
step S21, periodically generating a long wavelength pulse reference optical signal and a short wavelength pulse reference optical signal, the wavelength of the long wavelength pulse reference optical signal and the wavelength of the short wavelength pulse reference optical signal not being within the wavelength range of the service optical signal in the transmission fiber.
In this embodiment, the long-wavelength pulse light transmitter may periodically generate the long-wavelength pulse reference light signal, and the short-wavelength pulse light transmitter may periodically generate the short-wavelength pulse reference light signal.
The controller can control parameters such as emission period and pulse width of the long-wavelength pulse light emitter and the short-wavelength pulse light emitter.
It will be appreciated that the wavelength of the long wavelength pulsed reference optical signal is longer than the wavelength of the short wavelength pulsed reference optical signal.
Step S22, merging the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal, and the service optical signal to obtain a first merged signal, and sending the first merged signal to the transmission fiber.
Specifically, as shown in fig. 3, the long wavelength pulse reference optical signal and the short wavelength pulse reference optical signal may be input to a first multiplexer/demultiplexer, the first multiplexer/demultiplexer may combine the long wavelength pulse reference optical signal and the short wavelength pulse reference optical signal to obtain a pulse reference optical signal, inject the pulse reference optical signal into a first port of an optical circulator, exit from a second port of the optical circulator, and combine the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal, and the service optical signal through a second multiplexer/demultiplexer to obtain a first combined signal. For example, as shown in fig. 3, a pulse reference optical signal is injected into a first port 1 of an optical circulator, and after being emitted from a second port 2 of the optical circulator, the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal, and a service optical signal in a reverse direction to the long wavelength pulse reference optical signal and the short wavelength pulse reference optical signal are combined by a second combiner/splitter to obtain a first combined signal; alternatively, as shown in fig. 4, the pulse reference optical signal is injected into the first port 1 of the optical circulator, and then exits from the second port 2 of the optical circulator, and then the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal, and the service optical signal in the same direction as the long wavelength pulse reference optical signal and the short wavelength pulse reference optical signal are combined by the second multiplexer/demultiplexer to obtain a first combined signal.
Step S23, obtaining a rayleigh scattering signal corresponding to the first combined signal from the transmission fiber.
Specifically, the first combined signal generates a rayleigh scattering signal in the transmission fiber, and on this basis, as shown in fig. 3 or fig. 4, the rayleigh scattering signal corresponding to the first combined signal propagates back to the second combiner/splitter, and the second combiner/splitter acquires the rayleigh scattering signal corresponding to the first combined signal.
Steps S21-S23 are a specific implementation of step S11 in example 1.
Step S24 is to separate a long-wavelength rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength rayleigh scattering signal generated by the short-wavelength pulse reference optical signal from rayleigh scattering signals corresponding to the first combined signal.
Specifically, as shown in fig. 3 or fig. 4, the rayleigh scattered signal corresponding to the first combined signal returns to the second port 2 of the optical circulator, and exits from the third port 3 of the optical circulator to reach the third combiner-splitter, the third combiner-splitter separates the long-wavelength rayleigh scattered signal generated by the long-wavelength pulse reference optical signal and the short-wavelength rayleigh scattered signal generated by the short-wavelength pulse reference optical signal from the rayleigh scattered signal corresponding to the first combined signal, the long-wavelength rayleigh scattered signal is received by the long-wavelength optical receiver, and the short-wavelength rayleigh scattered signal is received by the short-wavelength optical receiver.
Step S24 is a specific implementation manner of step S12 in example 1.
Step S25, determining a first variation curve based on the long wavelength rayleigh scattering signal, wherein the first variation curve represents a variation trend of power of the long wavelength rayleigh scattering signal with time.
In this embodiment, the controller may acquire the long wavelength rayleigh scattering signal from the long wavelength optical receiver, and the controller may determine the first variation curve based on the long wavelength rayleigh scattering signal.
And step S26, determining a second variation curve based on the short-wavelength Rayleigh scattering signal, wherein the second variation curve represents the variation trend of the power of the short-wavelength Rayleigh scattering signal along with the change of time.
In this embodiment, the controller may acquire the short-wavelength rayleigh scattering signal from the short-wavelength optical receiver, and the controller determines the second variation curve based on the short-wavelength rayleigh scattering signal.
Step S27, if a power attenuation position exists in the first variation curve, determining a power variation corresponding to the power attenuation position.
The power attenuation position can be understood as: the position where the power drop is large.
Determining the power variation corresponding to the power attenuation position may include: and taking the difference value of the power corresponding to the ending time corresponding to the power attenuation position and the power corresponding to the starting time corresponding to the power attenuation position as the power variation corresponding to the power attenuation position.
And step S28, determining a power variation amount of the time corresponding to the power attenuation position at a corresponding position in the second variation curve.
In this embodiment, a region corresponding to the time corresponding to the power attenuation position in the second variation curve may be determined, and a difference between the power of the ending time corresponding to the region corresponding to the time corresponding to the power attenuation position in the second variation curve and the power of the starting time corresponding to the ending time may be determined as the power variation of the corresponding position in the second variation curve.
Steps S25-S28 are a specific implementation of step S13 in example 1.
Step S29, if the power variation corresponding to the power attenuation position is greater than the power variation corresponding to the time corresponding to the power attenuation position in the position corresponding to the second variation curve, determining that the transmission fiber has a risk of bending and eavesdropping.
In this embodiment, a rayleigh scattering signal corresponding to the first combined signal is obtained from the transmission fiber, a long-wavelength rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength rayleigh scattering signal generated by the short-wavelength pulse reference optical signal are separated from the rayleigh scattering signal corresponding to the first combined signal, a first variation curve is determined based on the long-wavelength rayleigh scattering signal, the first variation curve represents a variation trend of the power of the long-wavelength rayleigh scattering signal with time, a second variation curve is determined based on the short-wavelength rayleigh scattering signal, the second variation curve represents a variation trend of the power of the rayleigh short-wavelength rayleigh scattering signal with time, and if a power attenuation position exists in the first variation curve, a power variation corresponding to the power attenuation position is determined, and determining the power variation of the position corresponding to the time corresponding to the power attenuation position in the second variation curve, wherein if the power variation corresponding to the power attenuation position is larger than the power variation of the position corresponding to the time corresponding to the power attenuation position in the second variation curve, it is indicated that the loss generated by the long-wavelength target signal is larger than the loss generated by the short-wavelength target signal, and the loss generated by the long-wavelength target signal is larger than the loss generated by the short-wavelength target signal due to the bending of the optical fiber, so that the risk of bending and eavesdropping of the transmission optical fiber can be automatically, efficiently and accurately determined. For example, as shown in fig. 5, if there is a power attenuation position in the first variation curve, and the power variation corresponding to the power attenuation position is greater than the power variation corresponding to the time corresponding to the power attenuation position in the second variation curve, it is determined that the transmission fiber is at risk of bending and tapping.
As another alternative embodiment 3 of the present application, which is mainly an extension of the fiber optic eavesdropping detection method described in the above embodiment 2, as shown in fig. 6, the method may include, but is not limited to, the following steps:
step S31, periodically generating a long wavelength pulse reference optical signal and a short wavelength pulse reference optical signal, the wavelength of the long wavelength pulse reference optical signal and the wavelength of the short wavelength pulse reference optical signal not being within the wavelength range of the service optical signal in the transmission fiber.
Step S32, merging the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal, and the service optical signal to obtain a first merged signal, and sending the first merged signal to the transmission fiber.
Step S33, obtaining a rayleigh scattering signal corresponding to the first combined signal from the transmission fiber.
Step S34 is to separate a long-wavelength rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength rayleigh scattering signal generated by the short-wavelength pulse reference optical signal from rayleigh scattering signals corresponding to the first combined signal.
Step S35, determining a first variation curve based on the long wavelength rayleigh scattering signal, wherein the first variation curve represents a variation trend of power of the long wavelength rayleigh scattering signal with time.
And step S36, determining a second variation curve based on the short-wavelength Rayleigh scattering signal, wherein the second variation curve represents the variation trend of the power of the short-wavelength Rayleigh scattering signal along with the change of time.
Step S37, if a power attenuation position exists in the first variation curve, determining a power variation corresponding to the power attenuation position.
And step S38, determining a power variation amount of the time corresponding to the power attenuation position at a corresponding position in the second variation curve.
Step S39, if the power variation corresponding to the power attenuation position is greater than the power variation corresponding to the time corresponding to the power attenuation position in the position corresponding to the second variation curve, determining that the transmission fiber has a risk of bending and eavesdropping.
The detailed procedures of steps S31-S39 can be referred to the related descriptions of steps S21-S29 in embodiment 2, and are not described herein again.
Step S310, determining the length of the optical fiber based on the time corresponding to the power attenuation position and the propagation speed of the light speed in the transmission optical fiber.
In this embodiment, the time corresponding to the power attenuation position may be taken as the receiving time of the long wavelength rayleigh scattering signal, the propagation duration of the long wavelength rayleigh scattering signal may be determined based on the transmitting time of the long wavelength pulse reference optical signal and the receiving time of the long wavelength rayleigh scattering signal, and the product of the propagation duration of the long wavelength rayleigh scattering signal and the propagation velocity of the optical velocity in the transmission fiber may be taken as the fiber length.
Step S311, determining a position in the transmission fiber where there is a risk of bending eavesdropping based on the fiber length.
In this embodiment, the position in the transmission fiber that is apart from the start position of the transmission fiber may be the position of the length of the fiber, and may be determined as the position in the transmission fiber where the risk of bending and eavesdropping exists.
In this embodiment, a rayleigh scattering signal corresponding to the first combined signal is obtained from the transmission fiber, a long-wavelength rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength rayleigh scattering signal generated by the short-wavelength pulse reference optical signal are separated from the rayleigh scattering signal corresponding to the first combined signal, a first variation curve is determined based on the long-wavelength rayleigh scattering signal, the first variation curve represents a variation trend of the power of the long-wavelength rayleigh scattering signal with time, a second variation curve is determined based on the short-wavelength rayleigh scattering signal, the second variation curve represents a variation trend of the power of the short-wavelength rayleigh scattering signal with time, and if there is a power attenuation position in the first variation curve, a power variation corresponding to the power attenuation position is determined, and determining the power variation of the position corresponding to the time corresponding to the power attenuation position in the second variation curve, wherein if the power variation corresponding to the power attenuation position is greater than the power variation of the position corresponding to the time corresponding to the power attenuation position in the second variation curve, it is indicated that the loss generated by the long-wavelength target signal is greater than the loss generated by the short-wavelength target signal, and the loss generated by the long-wavelength target signal is greater than the loss generated by the short-wavelength target signal due to the bending of the optical fiber.
And determining the length of the optical fiber based on the time corresponding to the power attenuation position and the propagation speed of the light velocity in the transmission optical fiber, and determining the position of the transmission optical fiber where the risk of bending eavesdropping exists based on the length of the optical fiber, thereby realizing the positioning of the position where eavesdropping possibly occurs.
As another alternative embodiment 4 of the present application, mainly a refinement of the fiber optic eavesdropping detection method described in the above embodiment 1, as shown in fig. 7, the method may include, but is not limited to, the following steps:
and step S41, acquiring a current part of service optical signals from the transmission optical fiber.
In this embodiment, an optical splitter disposed on a receiving side of a transmission fiber may obtain a part of service optical signals from the transmission fiber.
A portion of the service optical signal may also be obtained from the transmission fiber by an optical amplifier and splitter disposed on the receive side of the transmission fiber. The optical amplifier is connected with the transmission optical fiber, the optical splitter is connected with the optical amplifier, the service optical signal in the transmission optical fiber passes through the optical amplifier, and the optical splitter obtains a part of service optical signal from the service optical signal output by the optical amplifier.
Step S41 is a specific implementation manner of step S11 in example 1.
Step S42, obtaining a long wavelength service optical signal and a short wavelength service optical signal from the current part of service optical signals.
The optical splitter may send the current part of the service optical signals to the optical channel monitoring device, and the optical channel monitoring device obtains the long-wavelength service optical signals and the short-wavelength service optical signals from the current part of the service optical signals.
Step S42 is a specific implementation manner of step S12 in example 1.
Step S43, determining a current spectral curve based on the current part of the service optical signals, where the current spectral curve represents a corresponding relationship between current service optical signals with different wavelengths and power information thereof.
The optical channel monitoring device may monitor the power of the current portion of the service optical signal, and determine a current spectral curve based on the power of the current portion of the service optical signal. The current spectral curve represents the corresponding relationship between the current service optical signals with different wavelengths in the current part of service optical signals and the power information thereof.
And step S44, acquiring a historical spectrum curve.
The historical spectrum curve may be understood as a historical spectrum curve determined by the optical channel monitoring device based on the power of a part of historical service optical signals, and the historical spectrum curve represents a corresponding relationship between historical service optical signals of different wavelengths and power information thereof.
Step S45, comparing the current spectrum curve with the historical spectrum curve, and determining the power variation of the long wavelength service optical signal and the power variation of the short wavelength service optical signal.
For example, as shown in fig. 8, the difference between the power of the long wavelength service optical signal in the current spectral curve and the power of the long wavelength service optical signal in the historical spectral curve may be determined as the power variation of the long wavelength optical signal by comparing the current spectral curve with the historical spectral curve, and the difference between the power of the short wavelength service optical signal in the current spectral curve and the power of the short wavelength service optical signal in the historical spectral curve may be determined as the power variation of the short wavelength optical signal.
Steps S43-S45 are a specific implementation of step S13 in example 1.
And step S46, if the power variation of the long-wavelength target signal is larger than that of the short-wavelength target signal, determining that the transmission fiber is at risk of bending and eavesdropping.
In this embodiment, a current portion of service optical signals are obtained from the transmission optical fiber, a long-wavelength service optical signal and a short-wavelength service optical signal are obtained from the current portion of service optical signals, a current spectrum curve is determined based on the current portion of service optical signals, the current spectrum curve represents a corresponding relationship between current service optical signals with different wavelengths and power information thereof, a historical spectrum curve is obtained, the historical spectrum is used for representing a corresponding relationship between historical service optical signals with different wavelengths and power information thereof, the current spectrum curve and the historical spectrum curve are compared to determine a power variation of the long-wavelength service optical signal and a power variation of the short-wavelength service optical signal, and if the power variation of a long-wavelength target signal is greater than the power variation of a short-wavelength target signal, it is determined that the loss generated by the long-wavelength target signal is greater than the loss generated by the short-wavelength target signal, the loss generated by the long-wavelength target signal is larger than the loss generated by the short-wavelength target signal due to the bending of the optical fiber, so that the risk of bending and eavesdropping of the transmission optical fiber can be automatically, efficiently and accurately determined.
The following describes the optical fiber eavesdropping detection apparatus provided in the present application, and the optical fiber eavesdropping detection apparatus described below and the optical fiber eavesdropping detection method described above may be referred to in correspondence with each other.
Referring to fig. 9, the optical fiber eavesdropping detecting apparatus includes: a first acquisition module 100, a second acquisition module 200, a first determination module 300, and a second determination module 400.
A first obtaining module 100, configured to obtain a target signal from a transmission optical fiber;
a second obtaining module 200, configured to obtain a long-wavelength target signal and a short-wavelength target signal from the target signal;
a first determining module 300, configured to determine a power variation of the long-wavelength target signal based on the long-wavelength target signal, and determine a power variation of the short-wavelength target signal based on the short-wavelength target signal;
a second determining module 400, configured to determine that the transmission fiber is at risk of bending eavesdropping if the power variation of the long-wavelength target signal is larger than the power variation of the short-wavelength target signal.
In this embodiment, the first obtaining module 100 may be specifically configured to:
periodically generating a long wavelength pulsed reference optical signal and a short wavelength pulsed reference optical signal, the wavelength of the long wavelength pulsed reference optical signal and the wavelength of the short wavelength pulsed reference optical signal not being within a wavelength range of a service optical signal in a transmission fiber;
combining the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal and the service optical signal to obtain a first combined signal, and sending the first combined signal to the transmission optical fiber;
obtaining a Rayleigh scattering signal corresponding to the first combined signal from the transmission optical fiber;
the acquiring long-wavelength target signals and short-wavelength target signals from the target signals comprises:
and separating a long-wavelength Rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength Rayleigh scattering signal generated by the short-wavelength pulse reference optical signal from Rayleigh scattering signals corresponding to the first combined signal.
In this embodiment, the first determining module 300 may be specifically configured to:
determining a first variation curve based on the long-wavelength Rayleigh scattering signal, wherein the first variation curve represents the variation trend of the power of the long-wavelength Rayleigh scattering signal along with the time;
determining a second variation curve based on the short-wavelength Rayleigh scattering signal, wherein the second variation curve represents the variation trend of the power of the short-wavelength Rayleigh scattering signal along with the time;
if the first change curve has a power attenuation position, determining a power variation corresponding to the power attenuation position;
and determining the power variation of the corresponding position of the time corresponding to the power attenuation position in the second variation curve.
In this embodiment, the apparatus may further include:
a third determining module, configured to determine a length of the optical fiber based on a time corresponding to the power attenuation position and a propagation speed of an optical speed in the transmission optical fiber;
a fourth determining module for determining a location in the transmission fiber where there is a risk of bending eavesdropping based on the length of the fiber.
In this embodiment, the first obtaining module 100 may be specifically configured to:
acquiring a current part of service optical signals from the transmission optical fiber;
the acquiring long-wavelength target signals and short-wavelength target signals from the target signals comprises:
and acquiring a long-wavelength service optical signal and a short-wavelength service optical signal from the current part of service optical signals.
In this embodiment, the first determining module 300 may be specifically configured to:
determining a current spectral curve based on the current part of service optical signals, wherein the current spectral curve represents the corresponding relation between current service optical signals with different wavelengths and power information thereof;
acquiring a historical spectrum curve, wherein the historical spectrum curve represents the corresponding relation between historical service optical signals with different wavelengths and power information of the historical service optical signals;
and comparing the current spectrum curve with the historical spectrum curve, and determining the power variation of the long-wavelength service optical signal and the power variation of the short-wavelength service optical signal.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for detecting a wiretap, comprising:
acquiring a target signal from a transmission optical fiber;
acquiring a long-wavelength target signal and a short-wavelength target signal from the target signal;
determining a power variation amount of the long-wavelength target signal based on the long-wavelength target signal, and determining a power variation amount of the short-wavelength target signal based on the short-wavelength target signal;
and if the power variation of the long-wavelength target signal is larger than that of the short-wavelength target signal, determining that the transmission optical fiber has the risk of bending and eavesdropping.
2. The method of claim 1, wherein said obtaining a target signal from a transmission fiber comprises:
periodically generating a long wavelength pulsed reference optical signal and a short wavelength pulsed reference optical signal, the wavelength of the long wavelength pulsed reference optical signal and the wavelength of the short wavelength pulsed reference optical signal not being within a wavelength range of a service optical signal in a transmission fiber;
combining the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal and the service optical signal to obtain a first combined signal, and sending the first combined signal to the transmission optical fiber;
obtaining a Rayleigh scattering signal corresponding to the first combined signal from the transmission optical fiber;
the acquiring long-wavelength target signals and short-wavelength target signals from the target signals comprises:
and separating a long-wavelength Rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength Rayleigh scattering signal generated by the short-wavelength pulse reference optical signal from Rayleigh scattering signals corresponding to the first combined signal.
3. The method of claim 2, wherein determining the power variation of the long wavelength target signal based on the long wavelength target signal and the power variation of the short wavelength target signal based on the short wavelength target signal comprises:
determining a first variation curve based on the long-wavelength Rayleigh scattering signal, wherein the first variation curve represents the variation trend of the power of the long-wavelength Rayleigh scattering signal along with the time;
determining a second variation curve based on the short-wavelength Rayleigh scattering signal, wherein the second variation curve represents the variation trend of the power of the short-wavelength Rayleigh scattering signal along with the variation of time;
if the first change curve has a power attenuation position, determining a power variation corresponding to the power attenuation position;
and determining the power variation of the corresponding position of the time corresponding to the power attenuation position in the second variation curve.
4. The method of claim 3, further comprising:
determining the length of the optical fiber based on the time corresponding to the power attenuation position and the propagation speed of the light speed in the transmission optical fiber;
based on the length of the optical fiber, a location in the transmission fiber at risk of a bending tap is determined.
5. The method of claim 1, wherein said obtaining a target signal from a transmission fiber comprises:
acquiring a current part of service optical signals from the transmission optical fiber;
the acquiring long-wavelength target signals and short-wavelength target signals from the target signals comprises:
and acquiring a long-wavelength service optical signal and a short-wavelength service optical signal from the current part of service optical signals.
6. The method of claim 5, wherein determining the power variation of the long wavelength target signal based on the long wavelength target signal and determining the power variation of the short wavelength target signal based on the short wavelength target signal comprises:
determining a current spectral curve based on the current part of service optical signals, wherein the current spectral curve represents the corresponding relation between current service optical signals with different wavelengths and power information thereof;
acquiring a historical spectrum curve, wherein the historical spectrum curve represents the corresponding relation between historical service optical signals with different wavelengths and power information of the historical service optical signals;
and comparing the current spectrum curve with the historical spectrum curve, and determining the power variation of the long-wavelength service optical signal and the power variation of the short-wavelength service optical signal.
7. An optical fiber eavesdropping detecting apparatus, comprising:
the first acquisition module is used for acquiring a target signal from the transmission optical fiber;
the second acquisition module is used for acquiring a long-wavelength target signal and a short-wavelength target signal from the target signal;
a first determining module, configured to determine a power variation of the long-wavelength target signal based on the long-wavelength target signal, and determine a power variation of the short-wavelength target signal based on the short-wavelength target signal;
and the second determining module is used for determining that the transmission optical fiber has the risk of bending and wiretapping if the power variation of the long-wavelength target signal is larger than that of the short-wavelength target signal.
8. The apparatus of claim 7, wherein the first obtaining module is specifically configured to:
periodically generating a long wavelength pulsed reference optical signal and a short wavelength pulsed reference optical signal, the wavelength of the long wavelength pulsed reference optical signal and the wavelength of the short wavelength pulsed reference optical signal not being within a wavelength range of a service optical signal in a transmission fiber;
combining the long wavelength pulse reference optical signal, the short wavelength pulse reference optical signal and the service optical signal to obtain a first combined signal, and sending the first combined signal to the transmission optical fiber;
obtaining a Rayleigh scattering signal corresponding to the first combined signal from the transmission optical fiber;
the acquiring long-wavelength target signals and short-wavelength target signals from the target signals comprises:
and separating a long-wavelength Rayleigh scattering signal generated by the long-wavelength pulse reference optical signal and a short-wavelength Rayleigh scattering signal generated by the short-wavelength pulse reference optical signal from Rayleigh scattering signals corresponding to the first combined signal.
9. The apparatus of claim 8, wherein the first determining module is specifically configured to:
determining a first variation curve based on the long-wavelength Rayleigh scattering signal, wherein the first variation curve represents the variation trend of the power of the long-wavelength Rayleigh scattering signal along with the time;
determining a second variation curve based on the short-wavelength Rayleigh scattering signal, wherein the second variation curve represents the variation trend of the power of the short-wavelength Rayleigh scattering signal along with the time;
if the first change curve has a power attenuation position, determining a power variation corresponding to the power attenuation position;
and determining the power variation of the corresponding position of the time corresponding to the power attenuation position in the second variation curve.
10. The apparatus of claim 9, further comprising:
a third determining module, configured to determine a length of the optical fiber based on a time corresponding to the power attenuation position and a propagation speed of an optical speed in the transmission optical fiber;
a fourth determining module for determining a location in the transmission fiber where there is a risk of bending eavesdropping based on the length of the fiber.
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