CN109905234B - Quantum key distribution and optical communication system common-fiber transmission method and device - Google Patents
Quantum key distribution and optical communication system common-fiber transmission method and device Download PDFInfo
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Abstract
The application provides a method and a device for quantum key distribution and optical communication system common-fiber transmission. When receiving the signal parameters of the optical communication system detected and sent by the common fiber transmission system, initializing the working modes and working parameters of the QKD system and the common fiber transmission system according to the received signal parameters of the optical communication system and the configured mapping relation; monitoring signal parameters of the QKD system in the common-fiber transmission working process, and receiving the signal parameters of the optical communication system monitored by the common-fiber transmission system; and when the change of the optical power in the signal parameters of the optical communication system is determined to be larger than a first preset power threshold value and the current system performance cannot meet the preset performance index requirement according to the monitored signal parameters of the QKD system, adjusting the working parameters of the QKD system and the common fiber transmission system according to the signal parameters of the current optical communication system and the configured mapping relation. The configuration and adjustment of the system working mode and the working parameters can be automatically realized.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for quantum key distribution and optical communication system shared-fiber transmission.
Background
Quantum Key Distribution (QKD) firstly realizes secure key sharing that cannot be intercepted between a transmitting party and a receiving party through quantum state transmission and measurement, and then realizes the encrypted transmission of classical information by combining with the traditional secret communication technology.
Secure communication based on quantum key distribution is called quantum secure communication, and as a technology that has been put into practical use first in the field of quantum communication, quantum secure communication has been rapidly developed in recent years in the aspects of technical research, trial application, industrial popularization, and the like.
The QKD system signals include quantum state optical signals, synchronization optical signals, and negotiation optical signals, and in practical applications, if the three optical signals of the QKD system and the optical communication system signal occupy separate optical fiber transmissions, a large amount of real-time network optical fiber resources are consumed, which causes limitations and obstacles to practical deployment and application thereof.
The quantum state optical signal belongs to a single photon level weak optical signal, and when the quantum state optical signal and a strong optical signal of an optical communication system are subjected to common-fiber hybrid transmission, due to a spontaneous Raman scattering effect in an optical fiber, Raman scattering noise introduced by the strong optical signal can cause the deterioration of parameters such as detection efficiency, dark count and response time of a single photon detector of a QKD system, and even complete saturation failure can be caused. Therefore, the solution of the problem of the common-fiber transmission of the QKD and the optical communication is of great significance for further promoting the practical application of the QKD technology.
In QKD and optical communication common-fiber transmission, operating parameters such as direction, wavelength, power, and the like of a service optical signal in an optical communication system may change in real time with changes in network environment, and may also change completely due to reconfiguration of upper-layer service and physical layer optical paths. The change of the optical signal of the optical communication system will affect the QKD system signal transmitted by the common fiber, which causes the deterioration of the transmission capability of the QKD and the rate of the security key coding, and causes serious impact on the application of the common fiber transmission.
Disclosure of Invention
In view of this, the present application provides a method and an apparatus for quantum key distribution and optical communication system optical fiber transmission, which can automatically implement configuration and adjustment of the working mode and working parameters of the quantum key distribution and optical communication system optical fiber transmission system.
In order to solve the technical problem, the technical scheme of the application is realized as follows:
a quantum key distribution and optical communication system common-fiber transmission method is provided, which comprises the mapping relation between the configured optical system signal parameters and the working modes and working parameters of a QKD system and a common-fiber transmission system; the method comprises the following steps:
receiving signal parameters of the optical communication system detected and sent by the common fiber transmission system, and initializing working modes and working parameters of the QKD system and the common fiber transmission system according to the received signal parameters of the optical communication system and the configured mapping relation;
monitoring signal parameters of the QKD system in the common-fiber transmission working process, and receiving the signal parameters of the optical communication system monitored by the common-fiber transmission system;
and when the change of the optical power in the signal parameters of the optical communication system is determined to be larger than a first preset power threshold value and the current system performance cannot meet the preset performance index requirement according to the monitored signal parameters of the QKD system, adjusting the working parameters of the QKD system and the common fiber transmission system according to the signal parameters of the current optical communication system and the configured mapping relation.
A quantum key distribution QKD and optical communication system common fiber transmission apparatus, the apparatus comprising: the device comprises a receiving unit, a configuration unit, a monitoring unit and a processing unit;
the receiving unit is used for receiving the signal parameters of the optical communication system detected and sent by the common fiber transmission system;
the configuration unit is used for configuring the mapping relation between the signal parameters of the optical system and the working modes and working parameters of the QKD system and the common-fiber transmission system; when the receiving unit receives the signal parameters of the optical communication system detected and sent by the common fiber transmission system, the working modes and working parameters of the QKD system and the common fiber transmission system are initialized according to the received signal parameters of the optical communication system and the configured mapping relation;
the monitoring unit is used for monitoring the signal parameters of the QKD system in the working process of the common-fiber transmission;
and the processing unit is configured to, when it is determined that the change of the optical power in the signal parameter of the optical communication system received by the receiving unit is greater than a first preset power threshold and it is determined that the current system performance cannot meet a preset performance index requirement according to the signal parameter of the QKD system monitored by the monitoring unit, adjust the working parameters of the QKD system and the common fiber transmission system according to the current signal parameter of the optical communication system and the mapping relationship configured by the configuration unit.
According to the technical scheme, the working modes and working parameters of the QKD system and the common fiber transmission system are automatically configured by detecting the signal parameters of the optical communication system; the working parameters of the QKD system and the common fiber transmission system are automatically adjusted by monitoring the signal parameters of the optical communication system and the QKD system, and the configuration and adjustment of the working mode and the working parameters of the system can be automatically realized.
Drawings
Fig. 1 is a schematic diagram illustrating a quantum key distribution and optical communication common-fiber transmission flow in an embodiment of the present application;
fig. 2 is a schematic diagram of a quantum key distribution and optical communication common-fiber transmission flow in the second embodiment of the present application;
fig. 3 is a schematic diagram of a quantum key distribution and optical communication common-fiber transmission system in an embodiment of the present application;
fig. 4 is a schematic diagram of a system for performing parameter adjustment and configuration by an FPGA in the embodiment of the present application;
fig. 5 is a schematic structural diagram of an apparatus applied to the above-described technology in the embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly apparent, the technical solutions of the present invention are described in detail below with reference to the accompanying drawings and examples.
The embodiment of the application provides a quantum key distribution and optical communication common-fiber transmission method which is applied to a quantum key distribution and optical communication common-fiber transmission system comprising an optical communication system, a QKD system and a common-fiber transmission system. Automatically configuring the working mode and the working parameters of the QKD system and the common fiber transmission system by detecting the signal parameters of the optical communication system; the operational parameters of the QKD system and the common fiber transmission system are automatically adjusted by monitoring the signal parameters of the optical communication system and the QKD system.
The optical communication system is a system which carries out common fiber transmission with the QKD system and carries service optical signals.
The QKD system is in common-fiber transmission with the optical communication system, carries quantum optical signals, synchronous optical signals and negotiation optical signals for transmission, and completes quantum key transmission and sharing by combining the existing QKD coding protocol, modulation technology and post-processing algorithm.
The encoding protocol, the modulation technology and the post-processing algorithm technology in the QKD system are all realized based on the prior technical scheme, and the common-fiber transmission method provided by the invention can be suitable for different QKD system technical schemes.
The optical fiber sharing transmission system is used for realizing the self-adaptive wavelength division multiplexing transmission of the optical communication system and the QKD system in the same optical fiber core, detecting the signal parameters of the optical communication system and sending the detection result to each control device, so that the control device carries out initialization configuration on the working mode and the working parameters of the QKD system and the optical fiber sharing transmission system according to the detection result.
In the embodiment of the present application, when the automatic configuration and the adjustment of the working parameters are implemented, the control device needs to configure a mapping relationship in advance, where the mapping relationship is a relationship between a signal parameter of the optical communication system and a working mode and a working parameter of the QKD system and the common fiber transmission system.
The signal parameters of the optical communication system include: the transmission direction, the working wavelength window and the optical power of the service optical signal; the optical service signal can contain various modulation formats, signal rates and working wavelengths, and the common-fiber transmission method provided by the application is completely transparent to the service signal of the optical communication system, namely only detects the signal parameters of the optical communication system, and does not modify any parameters of the optical communication system.
The operation mode of the QKD system is the transmission direction of the QKD system signals;
operational parameters of the QKD system include: the method comprises the following steps of (1) transmitting a light source wavelength of a transmitter, pulse repetition frequency, a decoy state modulation parameter and a receiver detector gate control parameter;
the working mode of the common-fiber transmission system is the working mode of the multiplexer/demultiplexer related to the transmission direction;
the working parameters of the common-fiber transmission system comprise: the service signal attenuation of the optical communication system, the working modes of the multiplexer/demultiplexer related to the wavelength window, the central wavelength of the optical filter and the passband parameters.
The configured mapping relationship is specifically as follows:
the transmission direction of the service optical signal and the transmission direction of the QKD system signal are transmitted in a common fiber mode and correspond to each other;
for example, if the transmission direction of the traffic optical signal is a to B, the transmission direction of the corresponding QKD system signal is also configured as a to B;
the working wavelength window of the optical communication system service optical signal corresponds to the wavelength of the transmitter light source in the QKD system working parameters;
for example, when the optical communication system service optical signal is transmitted by using the C band of the 1550nm wavelength window, the QKD system correspondingly uses the O band of the 1310nm wavelength window as the light source operating wavelength of the quantum optical signal, i.e. the transmitter light source wavelength; using 1490nm as the light source working wavelength of the synchronous optical signal and 1570nm as the light source working wavelength of the negotiation optical signal;
the optical power of the optical communication system service optical signal corresponds to the pulse repetition frequency, the decoy state modulation parameter and the receiver detector gating parameter in the QKD system working parameter;
for example, when the power of the service optical signal is increased, the rate of the code of the QKD system is affected, which results in the decrease of the rate of the code, and at this time, by increasing the pulse repetition frequency, or decreasing the number of null pulses in decoy state modulation, or decreasing the width of the detector gating pulse of the receiver, the effect of scattering noise of the service optical signal on the rate of the code of the QKD system can be reduced, and the rate of the code of the QKD system is kept stable at a usable level.
The working wavelength window of the service optical signal of the optical communication system corresponds to the working mode of the wavelength window of the multiplexer/demultiplexer of the common-fiber transmission system, and the central wavelength of the optical filter corresponds to the passband parameter.
For example, when the working window of the service optical signal changes, the working modes of the multiplexer/demultiplexer in the common fiber transmission system related to the wavelength window, that is, the input/output ports corresponding to different wavelengths are switched, and the central wavelength of the optical filter is correspondingly adjusted.
The optical power of the service optical signal of the optical communication system corresponds to the optical power attenuation of the common fiber transmission system and the passband of the optical filter;
for example, when the optical power of the service optical signal increases, the optical power attenuation value in the common fiber transmission system increases, or the passband of the optical filter decreases, so as to reduce the influence of the scattering noise of the service optical signal on the coding rate of the QKD system.
In the mapping relationship, the following rules need to be satisfied for various corresponding relationships determined according to the interaction relationship between the systems:
in the process of adjusting the working mode and the working parameter configuration of the QKD system and the common fiber transmission system, the requirements of the working mode comprise that the QKD signal and the optical communication signal are transmitted in the same direction, the QKD signal and the optical communication signal are isolated by selecting different working wavelength windows, and the requirements of the working parameters comprise that the attenuator of the common fiber transmission system is adjusted, the center wavelength of an optical filter is adjusted, the passband parameter is adjusted, and the detector gating parameter of the QKD system is adjusted according to the working wavelength window and the optical signal intensity of the service signal of the optical communication system.
The following describes in detail a quantum key distribution and optical communication common fiber transmission process in the embodiments of the present application with reference to the drawings.
Example one
Referring to fig. 1, fig. 1 is a schematic diagram of a transmission flow of a quantum key distribution and optical communication common fiber in an embodiment of the present application. The method comprises the following specific steps:
The working modes and working parameter configurations of the common fiber transmission system and the QKD system are configured in a centralized manner by the control equipment and are completed simultaneously after the signal parameter detection of the optical communication system is completed.
And 102, monitoring the signal parameters of the QKD system by the control equipment in the common-fiber transmission working process, and receiving the signal parameters of the optical communication system monitored by the common-fiber transmission system.
And 103, when the change of the optical power in the signal parameters of the optical communication system is determined to be larger than a first preset power threshold value and the current system performance cannot meet the preset performance index requirement according to the monitored signal parameters of the QKD system, adjusting the working parameters of the QKD system and the common fiber transmission system according to the signal parameters of the current optical communication system and the configured mapping relation.
The step is realized specifically, and when the transmission performance degradation of the system is determined according to the monitoring result, namely the performance index requirement cannot be met, the working parameters of the QKD system and the common fiber transmission system need to be adjusted.
The signal parameters of the QKD system include: quantum channel bit error rate and secure key rate; the performance degradation of the QKD system is firstly the reduction of the key rate, and then, seriously, the bit error rate is out of limit, so that the key can not be generated at all.
The method for determining that the monitored signal parameters of the QKD system cannot meet the preset performance index requirements specifically comprises the following steps:
and when the error rate of the sub-channel is greater than the preset error rate value and/or the speed of the security key is less than the preset speed value, determining that the current system performance can not meet the preset performance index requirement.
According to the change of the error rate parameter of the quantum channel, the influence of factors such as the wavelength window of the service signal of the optical communication system, the channel number, the optical power and the like on the transmission performance and the safe key rate in the QKD system in the common-fiber transmission process can be reflected, and the QKD system can be ensured to have stable performance and meet the index requirement under the common-fiber transmission condition by dynamically adjusting the working parameters of the QKD system and the common-fiber transmission system.
Example two
Referring to fig. 2, fig. 2 is a schematic diagram of a transmission flow of a quantum key distribution and optical communication common fiber in the second embodiment of the present application. The method comprises the following specific steps:
In this step, it is determined that the change of the signal parameter of the optical communication system satisfies the preset condition that the signal parameter of the optical communication system has one or any combination of the following conditions:
the transmission direction of the service optical signal changes, the working wavelength window changes, and the change value of the optical power is larger than a second preset power threshold value.
The second preset power threshold is greater than the first preset power threshold.
The change in optical power here refers to an abrupt change in optical power. When the sudden change of the optical power exceeds a preset threshold value, the error rate of the QKD system is over-limit and a secret key cannot be generated.
When the control device determines that the change of the signal parameter of the optical communication system satisfies the preset condition, it is determined that a significant change of service reconfiguration or physical layer reconfiguration may occur in the optical communication system.
The following describes in detail specific implementations of each module unit in the quantum key distribution and optical communication common fiber transmission system with reference to the accompanying drawings.
Referring to fig. 3, fig. 3 is a schematic diagram of a quantum key distribution and optical communication common-fiber transmission system in an embodiment of the present application.
The quantum key distribution and optical communication common fiber transmission system as in fig. 3 includes an optical communication system, a QKD system, and a common fiber transmission system.
The connection and interaction among the optical communication system, the QKD system, and the common fiber transmission system are consistent with the existing implementation, and the module for implementing the monitoring, configuring, and adjusting functions in the present application is referred to as a system control module, that is, the control device in the foregoing.
For an optical communication system, the common-fiber transmission method provided by the application is completely transparent to service signals of the optical communication system.
For a QKD system, the system includes: a tunable light source module and a QKD transceiver module;
the tunable optical module adopts a wavelength tunable laser as a light source to generate three paths of optical signals with different wavelengths as the input of the QKD system, wherein the wavelength window of each path of optical signal can be set, and the working wavelength can be adjusted.
The application provides a specific implementation example, but is not limited to such an implementation example:
when the optical communication system service optical signal is transmitted by adopting the C-band of the 1550nm wavelength window, 1310nm is used as the light source working wavelength of the quantum optical signal, 1490nm is used as the light source working wavelength of the synchronous optical signal, and 1570nm is used as the light source working wavelength of the negotiation optical signal.
The QKD transceiver module is a core component of the QKD system, and has the main functions of quantum state modulation, decoy state modulation, single-photon magnitude optical power attenuation, quantum state demodulation, photon detection and reception and protocol algorithm processing, and is used for realizing quantum key sharing of the QKD system.
The QKD transceiver module operates in a two-way duplex mode in which the gated detection frequency and gated pulse width parameters of the photon detector can be adjusted as needed.
For a common fiber transmission system, the system includes a wavelength division multiplexing module and an optical communication interface module.
The wavelength division multiplexing module consists of a wavelength division multiplexer and an optical bandpass filter and is used for completing wavelength division multiplexing and demultiplexing of optical communication signals and QKD system signals. Different wavelength ports of the wavelength division multiplexer are switched as required by adopting the optical path selection switch, and gating of different QKD signal transmission directions and selection of a common fiber transmission working mode are realized. The center wavelength and the pass band width of the optical band-pass filter can be adjusted as required to meet the filtering requirements of the photon detector of the QKD transceiver module under the condition of different optical communication system service optical signal powers.
And the optical communication interface module is used for realizing the access of service optical signals of the optical communication system, detecting and comparing the power of different wavelength windows, determining the transmission direction, the working wavelength window and the optical power of the optical communication system, and providing reference for the setting of the QKD system and the common-fiber transmission system. Meanwhile, the adjustable optical attenuator is adopted to realize the adjustment of the power of the optical signal of the input optical communication service according to the requirement.
And the system control module is used for receiving the detection information of the optical communication interface module and finishing the setting of the working modes and the working parameters of the tunable light source module, the QKD transceiver module, the wavelength division multiplexing module and the optical communication interface module.
And the feedback control of the QKD transceiver module and the optical communication interface module is completed by monitoring the performance parameters of the QKD transceiver in real time. When the optical signal of the optical communication system is reconstructed or the state of the physical layer is changed, the modules are reconfigured.
If the key code rate of the QKD system decreases or the error rate increases, then with reference to the above method, the parameters of the QKD system and the fiber-shared system are adjusted, for example, the attenuation of the optical signal is increased, or the operating frequency of the QKD is increased, etc.
In the specific implementation of the application, the system control module realizes parameter acquisition and system configuration based on a Field Programmable Gate Array (FPGA) platform.
For the tunable light source module in fig. 3, a tunable laser may be used for implementation, the QKD transceiver module may be implemented using a QKD transceiver, the wavelength division multiplexing module may be implemented using an optical bandpass filter and a wavelength division multiplexer, the optical communication interface module may be implemented using an optical communication adapter, and the system control module may be implemented using an FPGA controller.
The quantum key distribution and optical communication co-fiber transmission process provided by the application is realized by using specific elements.
Referring to fig. 4, fig. 4 is a schematic diagram of a system for adjusting and configuring parameters by an FPGA in the embodiment of the present application.
In fig. 4, the wavelength window and the optical power detection module in the optical communication adapter detect the working transmission direction, the working wavelength window and the optical power of the service optical signal of the optical communication system, and report the parameter information of the service optical signal to the FPGA controller. The tunable laser is then set to produce 1310nm, 1490nm and 1570nm optical pulse signals as the QKD transceiver optical signal input. Setting the operating mode and operating parameters of the QKD transmitter, generating a quantum optical signal with 1310nm wavelength, a synchronous optical signal with 1490nm wavelength and a negotiation optical signal with 1570nm wavelength, setting the operating mode and operating parameters in the QKD transceiver, enabling the demodulator to be consistent with the operating mode of the transmitter modulator, setting the gating operating frequency of the photon detector to be consistent with the pulse repetition frequency of the transmitter, and setting the gating pulse width to be 100 ps. And setting the central wavelength and the filtering bandwidth of each optical signal channel of the optical band-pass filter, wherein the central wavelength of the quantum optical signal is consistent with the output wavelength of the tunable laser, and the pass band width of the filter is 100 GHz. And gating the corresponding ports of the multiplexer-demultiplexer in the wavelength division multiplexer, and setting the QKD system and the optical communication system to be in the same-direction transmission.
In the working process of the common-fiber transmission, the FPGA controller monitors the service optical power and the working wavelength window in the optical communication adapter, simultaneously monitors the quantum signal error rate and the quantum key common-fiber rate in the QKD transceiver, and adjusts the working parameters of the optical band-pass filter and the QKD transceiver under the condition of generating transmission performance deterioration so as to ensure that the transmission performance of the QKD system meets the system index requirements.
When the optical communication system service reconfiguration or physical layer configuration is changed, the FPGA controller receives the service optical signal change of the optical communication adapter, and when the preset condition is met, the QKD system and the common fiber transmission system are subjected to self-adaptive configuration again according to new service optical working parameters.
Based on the same inventive concept, the application also provides a quantum key and optical communication system common-fiber transmission device. Referring to fig. 5, fig. 5 is a schematic structural diagram of an apparatus applied to the above technology in the embodiment of the present application. The device includes: a receiving unit 501, a configuration unit 502, a monitoring unit 503 and a processing unit 504;
a receiving unit 501, configured to receive a signal parameter of an optical communication system detected and sent by a common fiber transmission system;
a configuration unit 502, configured to configure mapping relationships between signal parameters of the optical system and working modes and working parameters of the QKD system and the common fiber transmission system; when the receiving unit 501 receives the signal parameters of the optical communication system detected and sent by the common fiber transmission system, the working modes and working parameters of the QKD system and the common fiber transmission system are initialized according to the received signal parameters of the optical communication system and the configured mapping relationship;
a monitoring unit 503, configured to monitor a signal parameter of the QKD system during the operation of the common fiber transmission;
a processing unit 504, configured to, when it is determined that a change of optical power in the signal parameter of the optical communication system received by the receiving unit 501 is greater than a first preset power threshold, and it is determined that the current system performance cannot meet a preset performance index requirement according to the signal parameter of the QKD system monitored by the monitoring unit 503, adjust working parameters of the QKD system and the common fiber transmission system according to the current signal parameter of the optical communication system and a mapping relationship configured by the configuration unit 502.
Preferably, the first and second liquid crystal films are made of a polymer,
the signal parameters of the optical communication system include: the transmission direction, the working wavelength window and the optical power of the service optical signal;
the working mode of the QKD system is the transmission direction of the QKD system signals; the working parameters of the QKD system comprise the wavelength of a light source of a transmitter, the pulse repetition frequency, the modulation parameters of a decoy state and the gating parameters of a detector of a receiver;
the working mode of the common fiber transmission system is the working mode of the multiplexer/demultiplexer related to the transmission direction; the working parameters of the common fiber transmission system comprise service signal attenuation of an optical communication system, working modes of a combiner-splitter related to a wavelength window, the central wavelength of an optical filter and passband parameters;
the mapping relation is as follows: the transmission direction of the service optical signal is transmitted in the same fiber with the QKD system signal, and the transmission direction is the same;
the working wavelength window corresponds to the wavelength of the light source of the transmitter; the optical power corresponds to the pulse repetition frequency, the decoy state modulation parameter and the receiver detector gate control parameter;
the working wavelength window of the service optical signal of the optical communication system corresponds to the working mode of the wavelength window related to the multiplexer/demultiplexer of the common-fiber transmission system, and the central wavelength of the optical filter corresponds to the passband parameter;
the optical power of the service optical signal corresponds to the optical power attenuation and the optical filter passband of the common fiber transmission system.
Preferably, the first and second liquid crystal films are made of a polymer,
the processing unit 504 is further configured to, during the operation of the common fiber transmission, reconfigure the operating mode and the operating parameters of the QKD system and the common fiber transmission system according to the monitored current signal parameters of the optical communication system and the configured mapping relationship when it is determined that the change of the signal parameters of the optical communication system satisfies the preset condition.
Preferably, the determining that the change of the signal parameter of the optical communication system satisfies the preset condition is that one or any combination of the following conditions exist in the signal parameter of the optical communication system: the transmission direction of the service optical signal changes, the working wavelength window changes, and the change value of the optical power is larger than a second preset power threshold value; and the second preset power threshold is greater than the first preset power threshold.
The units of the above embodiments may be integrated into one body, or may be separately deployed; may be combined into one unit or further divided into a plurality of sub-units.
To sum up, the method and the device can perform automatic optimization configuration on the QKD system and the common fiber transmission system by detecting optical signal parameters of the optical communication system, perform real-time feedback adjustment according to the working state of the system, perform reconfiguration on the QKD system and the common fiber transmission system when the signal reconstruction and the physical layer state of the optical communication system are changed, realize system automation configuration, and improve the transmission performance of the QKD system.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A quantum key distribution QKD and optical communication system common-fiber transmission method is characterized in that the signal parameters of an optical system are configured, and the mapping relation between the working modes and the working parameters of the QKD system and the common-fiber transmission system is configured; the method comprises the following steps:
receiving signal parameters of the optical communication system detected and sent by the common fiber transmission system, acquiring working modes and working parameters of the QKD system and the common fiber transmission system according to the received signal parameters of the optical communication system and the configured mapping relation, and initializing the QKD system and the common fiber transmission system;
monitoring signal parameters of the QKD system in the common-fiber transmission working process, and receiving the signal parameters of the optical communication system monitored by the common-fiber transmission system;
when the change of the optical power in the signal parameters of the optical communication system is determined to be larger than a first preset power threshold value and the current system performance cannot meet the preset performance index requirement according to the monitored signal parameters of the QKD system, acquiring the working modes and working parameters of the QKD system and the common-fiber transmission system according to the signal parameters of the current optical communication system and the configured mapping relation, and adjusting the working parameters of the QKD system and the common-fiber transmission system;
wherein the content of the first and second substances,
the signal parameters of the optical communication system include: the transmission direction, the working wavelength window and the optical power of the service optical signal;
the working mode of the QKD system is the transmission direction of the QKD system signals; the working parameters of the QKD system comprise the wavelength of a light source of a transmitter, the pulse repetition frequency, the modulation parameters of a decoy state and the gating parameters of a detector of a receiver;
the working mode of the common fiber transmission system is the working mode of the multiplexer/demultiplexer related to the transmission direction; the working parameters of the common fiber transmission system comprise service signal attenuation of an optical communication system, working modes of a combiner-splitter related to a wavelength window, the central wavelength of an optical filter and passband parameters;
the mapping relation is as follows: the transmission direction of the service optical signal is transmitted in the same fiber with the QKD system signal, and the transmission direction is the same;
the working wavelength window corresponds to the wavelength of the light source of the transmitter; the optical power corresponds to the pulse repetition frequency, the decoy state modulation parameter and the receiver detector gate control parameter;
the working wavelength window of the service optical signal of the optical communication system corresponds to the working mode of the wavelength window related to the multiplexer/demultiplexer of the common-fiber transmission system, and the central wavelength of the optical filter corresponds to the passband parameter;
the optical power of the service optical signal corresponds to the optical power attenuation and the optical filter passband of the common fiber transmission system.
2. The method of claim 1,
the signal parameters of the QKD system include a quantum channel bit error rate and a secure key rate.
3. The method of claim 2, wherein determining that the current system performance fails to meet a predetermined performance index requirement for the monitored signal parameters of the QKD system comprises:
and when the error rate of the sub-channel is greater than the preset error rate value and/or the speed of the security key is less than the preset speed value, determining that the current system performance can not meet the preset performance index requirement.
4. The method of claim 1, further comprising:
receiving signal parameters of an optical communication system monitored and sent by a common fiber transmission system in the common fiber transmission working process;
when the change of the signal parameters of the optical communication system meets the preset conditions, the working modes and the working parameters of the QKD system and the common fiber transmission system are reconfigured according to the monitored signal parameters of the current optical communication system and the configured mapping relation.
5. The method according to claim 4, wherein the determining that the change of the signal parameter of the optical communication system satisfies the preset condition is that one or any combination of the following conditions exist in the signal parameter of the optical communication system:
the transmission direction of the service optical signal changes, the working wavelength window changes, and the change value of the optical power is larger than a second preset power threshold value; and the second preset power threshold is greater than the first preset power threshold.
6. A quantum key distribution QKD and optical communication system common fiber transmission apparatus, comprising: the device comprises a receiving unit, a configuration unit, a monitoring unit and a processing unit;
the receiving unit is used for receiving the signal parameters of the optical communication system detected and sent by the common fiber transmission system;
the configuration unit is used for configuring the signal parameters of the optical system and the mapping relation between the QKD system and the working modes and working parameters of the common-fiber transmission system; when the receiving unit receives the signal parameters of the optical communication system detected and sent by the common fiber transmission system, the working modes and working parameters of the QKD system and the common fiber transmission system are obtained according to the received signal parameters of the optical communication system and the configured mapping relation, and the working modes and working parameters of the QKD system and the common fiber transmission system are initialized;
the monitoring unit is used for monitoring the signal parameters of the QKD system in the working process of the common-fiber transmission;
the processing unit is configured to, when it is determined that a change of optical power in the signal parameters of the optical communication system received by the receiving unit is greater than a first preset power threshold and it is determined that the current system performance cannot meet a preset performance index requirement according to the signal parameters of the QKD system monitored by the monitoring unit, obtain a working mode and working parameters of the QKD system and the common fiber transmission system according to the signal parameters of the current optical communication system and a mapping relationship configured by the configuration unit, and adjust the working parameters of the QKD system and the common fiber transmission system;
wherein the content of the first and second substances,
the signal parameters of the optical communication system include: the transmission direction, the working wavelength window and the optical power of the service optical signal;
the working mode of the QKD system is the transmission direction of the QKD system signals; the working parameters of the QKD system comprise the wavelength of a light source of a transmitter, the pulse repetition frequency, the modulation parameters of a decoy state and the gating parameters of a detector of a receiver;
the working mode of the common fiber transmission system is the working mode of the multiplexer/demultiplexer related to the transmission direction; the working parameters of the common fiber transmission system comprise service signal attenuation of an optical communication system, working modes of a combiner-splitter related to a wavelength window, the central wavelength of an optical filter and passband parameters;
the mapping relation is as follows: the transmission direction of the service optical signal is transmitted in the same fiber with the QKD system signal, and the transmission direction is the same;
the working wavelength window corresponds to the wavelength of the light source of the transmitter; the optical power corresponds to the pulse repetition frequency, the decoy state modulation parameter and the receiver detector gate control parameter;
the working wavelength window of the service optical signal of the optical communication system corresponds to the working mode of the wavelength window related to the multiplexer/demultiplexer of the common-fiber transmission system, and the central wavelength of the optical filter corresponds to the passband parameter;
the optical power of the service optical signal corresponds to the optical power attenuation and the optical filter passband of the common fiber transmission system.
7. The apparatus of claim 6,
and the processing unit is further configured to, during the operation of the common-fiber transmission, reconfigure the operating mode and the operating parameters of the QKD system and the common-fiber transmission system according to the monitored current signal parameters of the optical communication system and the configured mapping relationship when it is determined that the change of the signal parameters of the optical communication system satisfies the preset condition.
8. The apparatus according to claim 7, wherein the determining that the change of the signal parameter of the optical communication system satisfies the preset condition is that one or any combination of the following conditions exist in the signal parameter of the optical communication system: the transmission direction of the service optical signal changes, the working wavelength window changes, and the change value of the optical power is larger than a second preset power threshold value; and the second preset power threshold is greater than the first preset power threshold.
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