Channel selection method and device based on common fiber transmission, equipment and medium

Abstract

The invention provides a channel selection method and device based on common fiber transmission, equipment and a medium, and relates to the technical field of quantum communication. The method comprises: acquiring signal transmission capability information of each communication channel, the communication channel being a transmission channel for transmitting a communication signal in a plurality of transmission channels for common fiber transmission; at least one channel allocation scheme is generated according to the service demand information and the signal transmission capability information of each communication channel, and each channel allocation scheme comprises one or more communication channels; the noise intensity of each channel allocation scheme to a quantum channel is determined, and the quantum channel is a transmission channel used for transmitting quantum signals in a plurality of transmission channels for common-fiber transmission; and determining the channel allocation scheme with the minimum noise intensity in the at least one channel allocation scheme as a target channel allocation scheme for common-fiber transmission with the quantum channel. According to the invention, the performance of the common-fiber transmission system can be remarkably improved in an application scene with relatively low classical communication capacity.

Description

Background Art

[0002] Quantum communication technology is a technology that uses quantum states as carriers to transmit quantum information or classical information through quantum state transmission. Based on quantum communication technology, the communication method that uses the characteristics of quantum indivisibility, quantum state non-cloning and quantum entanglement to protect secret information and thus ensure the security of information transmission is called quantum secure communication technology. Among them, quantum key distribution (QKD) technology has received widespread attention in recent years because it is the only technology in the field of quantum information that can be proven to be secure by information theory, and has gradually moved from theory to practical application. Taking optical fiber transmission media as an example, quantum key distribution requires two optical fiber channels, one for transmitting classical information and the other for transmitting quantum information. Laying an additional optical fiber will increase the cost of deploying QKD equipment. Therefore, integrating QKD technology into the existing optical fiber network infrastructure is an effective way to promote the practical application and industrialization of QKD technology.

[0003] At present, two transmission channels are still required in the common fiber transmission scheme of classical optical communication and quantum key distribution. In application scenarios where optical fiber resources are tight, if a new optical fiber channel is laid without considering the cost, the additionally deployed optical fiber channel will not only greatly increase the deployment difficulty, but also increase user costs, which is not conducive to the overall promotion and development of the industry. Therefore, the common fiber transmission scheme of classical optical communication and quantum key distribution has great development prospects.

[0004] In the related technology, the commonly used co-fiber transmission scheme is based on wavelength division multiplexing technology, which is mainly divided into coarse wavelength division multiplexing (taking the OC scheme as an example) and dense wavelength division multiplexing (taking the CC scheme as an example). In the OC scheme, since the wavelength interval between the classical signal and the quantum signal is relatively far, the noise introduced into the QKD system by the classical signal due to the nonlinear effect is effectively reduced. However, due to the large insertion loss in the O band, the transmission distance of the OC scheme has a bottleneck and is more suitable for short-distance metropolitan area network transmission. In the CC scheme, since the insertion loss of the C-band optical fiber is relatively small, long-distance transmission of the backbone network can be achieved. However, the nonlinear effect of the classical signal has a greater impact on the QKD system. Therefore, reducing the impact of classical noise on the quantum signal is the key to achieving high-coding rate co-fiber transmission of classical and quantum signals.

[0005] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0006] The present disclosure provides a channel selection method, device, equipment and medium based on co-fiber transmission, which at least to a certain extent overcomes the problem in the related art that the noise generated by the classical signal has a significant impact on the quantum signal.

[0007] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0008] According to one aspect of the present disclosure, a channel selection method based on common fiber transmission is provided, comprising: obtaining signal transmission capability information of each communication channel, wherein the communication channel is a transmission channel for transmitting communication signals among multiple transmission channels of common fiber transmission; generating at least one channel allocation scheme according to business demand information and signal transmission capability information of each communication channel, wherein each channel allocation scheme includes one or more communication channels; determining the noise intensity of each channel allocation scheme on a quantum channel, wherein the quantum channel is a transmission channel for transmitting quantum signals among multiple transmission channels of common fiber transmission; determining the channel allocation scheme with the smallest noise intensity among the at least one channel allocation scheme as the target channel allocation scheme for common fiber transmission with the quantum channel.

[0009] In some embodiments, obtaining the signal transmission capability information of each communication channel includes: obtaining all communication channels in the target optical network device; filtering out the communication channels that meet preset conditions among all the communication channels, and obtaining the signal transmission capability information of the remaining communication channels, wherein the preset condition is that the communication channel belongs to a communication channel in a filtering component in the target optical network device.

[0010] In some embodiments, the noise of each channel allocation scheme on the quantum channel includes at least any one of the following: channel crosstalk noise, spontaneous Raman scattering noise or four-wave mixing noise.

[0011] In some embodiments, the determining of the noise intensity of each channel allocation scheme on the quantum channel includes: if the signal to be transmitted in the business demand information is a single-wavelength communication signal, then according to the signal transmission capability information of each communication channel, determining the noise intensity of a first mixed noise generated by each channel allocation scheme on the quantum channel, wherein the first mixed noise is the noise generated by the mixture of channel crosstalk noise and spontaneous Raman scattering noise; if the signal to be transmitted in the business demand information is a multi-wavelength communication signal, then according to the signal transmission capability information of each communication channel, determining the noise intensity of a second mixed noise generated by each channel allocation scheme on the quantum channel, wherein the second mixed noise is the noise generated by the mixture of channel crosstalk noise, spontaneous Raman scattering noise and four-wave mixing noise.

[0012] In some embodiments, the noise intensity of the first mixed noise is expressed as follows:

[0013] p classical1 =min{p SRSi +p ci}, i∈{1,2,…,N};

[0014] Among them, p classical1 represents the noise intensity of the first mixed noise, p SRSi represents the noise intensity of spontaneous Raman scattering noise generated by the ith communication channel to the quantum channel, p ci It represents the noise intensity of the channel crosstalk noise generated by the i-th communication channel to the quantum channel, and min{} is used to calculate the minimum value of the data.

[0015] In some embodiments, the noise intensity of the second mixed noise is expressed as follows:

[0016] p classical2 =min{∑p SRSi +∑p ci +∑p FWMijk};

[0017] i,j,k∈m,m∈{1,2,…,M};

[0018] Among them, p classical represents the noise intensity of the second mixed noise, o SRSi represents the noise intensity of spontaneous Raman scattering noise generated by the ith communication channel in the mth channel allocation scheme to the quantum channel, p ci represents the noise intensity of the channel crosstalk noise generated by the ith communication channel in the mth channel allocation scheme to the quantum channel, p FWMijk It represents the noise intensity of the four-wave mixing noise generated by the i, j, and k communication channels in the m-th channel allocation scheme to the quantum channel. ∑() is used to calculate the sum of the data, and min{} is used to calculate the minimum value of the data.

[0019] According to another aspect of the present disclosure, a channel selection device based on common fiber transmission is also provided, including: a transmission capacity information acquisition module, used to acquire signal transmission capacity information of each communication channel, wherein the communication channel is a transmission channel for transmitting communication signals among multiple transmission channels of common fiber transmission; a channel allocation scheme generation module, used to generate at least one channel allocation scheme according to business demand information and signal transmission capacity information of each communication channel, wherein each channel allocation scheme includes one or more communication channels; a noise intensity determination module, used to determine the noise intensity of each channel allocation scheme to a quantum channel, wherein the quantum channel is a transmission channel for transmitting quantum signals among multiple transmission channels of common fiber transmission; a target channel allocation scheme selection module, used to determine the channel allocation scheme with the smallest noise intensity among the at least one channel allocation scheme as the target channel allocation scheme for common fiber transmission with the quantum channel.

[0020] According to another aspect of the present disclosure, an electronic device is also provided, comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute any one of the above-mentioned channel selection methods based on common fiber transmission by executing the executable instructions.

[0021] According to another aspect of the present disclosure, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the channel selection method based on common fiber transmission described in any one of the above is implemented.

[0022] According to another aspect of the present disclosure, a computer program product is further provided, including: a computer program or instructions, wherein when the computer program or instructions are executed by a processor, any one of the above-mentioned channel selection methods based on common fiber transmission is implemented.

[0023] The channel selection method, device, equipment and medium based on co-fiber transmission provided in the embodiments of the present disclosure obtain the signal transmission capability information of each communication channel, generate at least one channel allocation scheme in combination with the service demand information, and determine the noise intensity of each channel allocation scheme to the quantum channel, and determine the channel allocation scheme with the smallest noise intensity as the target channel allocation scheme for co-fiber transmission with the quantum channel. The embodiments of the present disclosure can significantly improve the performance of the co-fiber transmission system in application scenarios with low classical communication capacity.

[0024] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0026] Figure 1 A schematic diagram of an exemplary application system architecture to which the channel selection method based on co-fiber transmission in an embodiment of the present disclosure can be applied is shown;

[0027] Figure 2 A flow chart of a channel selection method based on co-fiber transmission in an embodiment of the present disclosure is shown;

[0028] Figure 3 Another flow chart of a channel selection method based on co-fiber transmission in an embodiment of the present disclosure is shown;

[0029] Figure 4 A schematic diagram of a channel selection device based on co-fiber transmission in an embodiment of the present disclosure is shown;

[0030] Figure 5 A block diagram of an electronic device in an embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0031] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0032] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0033] For ease of understanding, before introducing the embodiments of the present disclosure, several terms involved in the embodiments of the present disclosure are first explained as follows:

[0034] QKD: Quantum Key Distribution, a method in which both communicating parties generate symmetric keys by transmitting quantum states, which has information-theoretic security at the theoretical protocol level.

[0035] The specific implementation of the embodiment of the present disclosure is described in detail below with reference to the accompanying drawings.

[0036] Figure 1 FIG. 1 is a schematic diagram showing an exemplary application system architecture to which the channel selection method based on co-fiber transmission in the embodiment of the present disclosure can be applied. Figure 1 As shown, the system architecture may include a first classical optical communication system 101, a first quantum key distribution system 102 and a multiplexing module 1051 at the transmitting end, and a second classical optical communication system 103, a second quantum key distribution system 104 and a demultiplexing module 1052 at the receiving end.

[0037] Among them, the first classical optical communication system 101 includes a classical signal module (classical signal module 1, classical signal module 2, ..., classical signal module n) and an optical multiplexing module, and the first quantum key distribution system 102 includes a quantum signal module, a synchronization signal module, a negotiation signal module and a wavelength division multiplexing module; the second classical optical communication system 103 includes a classical signal module (classical signal module 1, classical signal module 2, ..., classical signal module n) and an optical demultiplexing module, and the second quantum key distribution system 104 includes a quantum signal module, a synchronization signal module, a negotiation signal module and a wavelength division multiplexing module.

[0038] In one embodiment of the present disclosure, the first classical optical communication system 101 and the second classical optical communication system 103 can both be used to transmit classical communication services. According to the number of channels of the classical service channels, the first classical optical communication system 101 can include a corresponding number of classical signal modules and optical multiplexing modules, and the second classical optical communication system 103 can include a corresponding number of classical signal modules and optical demultiplexing modules.

[0039] In one embodiment of the present disclosure, in the first quantum key distribution system 102 and the second quantum key distribution system 104, the quantum signal module can be used to enable the communicating parties to negotiate to generate a quantum key, the synchronization signal module can be used to synchronize the clock signals of the communicating parties, and the negotiation signal module can be used to perform post-processing and other operations on the original key generated by the communicating parties based on quantum key distribution QKD.

[0040] In one embodiment of the present disclosure, the multiplexing module 1051 and the demultiplexing module 1052 can multiplex and transmit the classical communication signal, quantum key distribution signal, synchronization signal and negotiation signal on the same fiber according to the type of transmission channel. In addition, in addition to the filtering function, the multiplexing module 1051 and the demultiplexing module 1052 also need to realize the combination and demultiplexing of waves. For example, the demultiplexing module 1052 can filter out the spontaneous Raman scattering noise and channel crosstalk noise generated by the classical signal outside the quantum channel during the common fiber transmission process.

[0041] Those skilled in the art will know that Figure 1 The number of the classic signal modules in the example is only illustrative, and any number of classic signal modules may be provided according to actual needs. The embodiments of the present disclosure are not limited to this.

[0042] Under the above system architecture, an embodiment of the present disclosure provides a channel selection method based on common fiber transmission, which can be executed by any electronic device with computing and processing capabilities.

[0043] In some embodiments, the channel selection method based on common fiber transmission provided in the embodiments of the present disclosure can be executed by a terminal device of the above-mentioned system architecture; in other embodiments, the channel selection method based on common fiber transmission provided in the embodiments of the present disclosure can be executed by a server in the above-mentioned system architecture; in other embodiments, the channel selection method based on common fiber transmission provided in the embodiments of the present disclosure can be implemented by the terminal device and the server in the above-mentioned system architecture through interaction.

[0044] Figure 2 A flow chart of a channel selection method based on co-fiber transmission in an embodiment of the present disclosure is shown. Figure 2 As shown, the channel selection method based on co-fiber transmission provided in the embodiment of the present disclosure includes the following steps:

[0045] S202, acquiring signal transmission capability information of each communication channel, wherein a communication channel is a transmission channel for transmitting communication signals among a plurality of transmission channels for co-fiber transmission.

[0046] In one embodiment of the present disclosure, a communication channel may refer to a classical channel, which can generally be used to transmit classical signals (i.e., conventional communication signals), and the signal transmission capability information may include but is not limited to network topology, bandwidth, wavelength, transmission distance, channel capacity, etc. of the classical communication channel, which is used to indicate the ability of the classical signal to effectively transmit information in the classical optical communication system.

[0047] S204: Generate at least one channel allocation scheme according to the service demand information and the signal transmission capability information of each communication channel, wherein each channel allocation scheme includes one or more communication channels.

[0048] In one embodiment of the present disclosure, the classical optical communication system can determine the allocation method of all selectable classical communication signals according to business requirements and in combination with the signal transmission capability information of each communication channel, that is, determine all selectable channel allocation schemes, and at the same time determine the wavelength and power information under various channel allocation schemes.

[0049] S206, determining the noise intensity of each channel allocation scheme on a quantum channel, wherein a quantum channel is a transmission channel for transmitting quantum signals among a plurality of transmission channels of co-fiber transmission.

[0050] In one embodiment of the present disclosure, the classical channel noise introduced can be evaluated at the QKD receiving end by using classical signals of different wavelengths that are initially set. For example, it can be assumed that the quantum channel wavelength is 1550.12nm and the classical channel capacity is 100Gbps, and based on this, the noise intensity of each channel allocation scheme on the quantum channel under different business requirements can be evaluated.

[0051] S206: Determine the channel allocation scheme with the smallest noise intensity among the at least one channel allocation scheme as the target channel allocation scheme for co-fiber transmission with the quantum channel.

[0052] In one embodiment of the present disclosure, the noise intensity of the quantum channel for each channel allocation scheme obtained can be sorted in ascending order, and the channel allocation scheme with the smallest noise intensity is determined as the target channel allocation scheme for co-fiber transmission with the quantum channel. It should be noted that any method that can obtain the channel allocation scheme with the smallest noise intensity, such as sorting from large to small, can also be used in the embodiment of the present disclosure, and the embodiment of the present disclosure does not specifically limit this.

[0053] As can be seen from the above, the embodiment of the present disclosure obtains the signal transmission capacity information of each communication channel, generates at least one channel allocation scheme in combination with the service demand information, and determines the noise intensity of each channel allocation scheme on the quantum channel, and determines the channel allocation scheme with the smallest noise intensity as the target channel allocation scheme for co-fiber transmission with the quantum channel. The embodiment of the present disclosure can significantly improve the performance of the co-fiber transmission system in application scenarios with low classical communication capacity.

[0054] In one embodiment of the present disclosure, the above S202 includes: obtaining all communication channels in the target optical network device; filtering out the communication channels that meet the preset conditions in all the communication channels, and obtaining the signal transmission capability information of the remaining communication channels, wherein the preset condition is that the communication channel belongs to the communication channel in the filtering component in the target optical network device.

[0055] In one embodiment of the present disclosure, all channels used for classical communication can be obtained during the initial selection, wherein the wavelengths of some communication channels may fall within the bandwidth of the filter components under the optical multiplexing module, and it is also necessary to exclude all other classical channels that can be used for co-fiber transmission within the quantum channel and synchronization channel bands to ensure that quantum signals, synchronization signals, and negotiation signals can communicate normally. Therefore, the wavelengths occupied by the quantum module, synchronization module, and negotiation signal module can be excluded through filters of corresponding wavelengths, and the remaining wavelengths are used for co-fiber transmission.

[0056] In one embodiment of the present disclosure, the noise of each channel allocation scheme on the quantum channel includes at least any one of the following: channel crosstalk noise, spontaneous Raman scattering noise or four-wave mixing noise.

[0057] In one embodiment of the present disclosure, classical signals of different wavelengths are initially set for all devices for transmitting classical signals, all available classical communication channels are traversed, and the introduced classical channel noise is evaluated at the QKD receiving end.

[0058] In one embodiment of the present disclosure, specifically, the noise introduced into the quantum channel by the nonlinear effect of the classical signal is mainly channel crosstalk noise, spontaneous Raman scattering noise and four-wave mixing noise. Channel crosstalk noise refers to the signal of one channel accidentally coupled to another channel, resulting in interference between signals, which is mainly limited by the demultiplexing module and the overall isolation of the wavelet demultiplexing module. Spontaneous Raman scattering noise usually originates from the inelastic interaction between photons and phonons. When there is a situation where the spectral bandwidth exceeds 200nm, the classical signal will cover the quantum signal range and generate spontaneous Raman scattering noise. Four-wave mixing noise refers to the nonlinear noise generated when two or more pump fields propagate in the same direction and interact through the third-order nonlinear interaction in the optical fiber. When this noise falls into the quantum channel, four-wave mixing noise is formed.

[0059] In one embodiment of the present disclosure, the above S206 includes: if the signal to be transmitted in the business demand information is a single-wavelength communication signal, then according to the signal transmission capability information of each communication channel, determining the noise intensity of the first mixed noise generated by each channel allocation scheme on the quantum channel, wherein the first mixed noise is the noise generated by the mixture of channel crosstalk noise and spontaneous Raman scattering noise; if the signal to be transmitted in the business demand information is a multi-wavelength communication signal, then according to the signal transmission capability information of each communication channel, determining the noise intensity of the second mixed noise generated by each channel allocation scheme on the quantum channel, wherein the second mixed noise is the noise generated by the mixture of channel crosstalk noise, spontaneous Raman scattering noise and four-wave mixing noise.

[0060] In one embodiment of the present disclosure, it is assumed that the quantum channel is 1550.12 nm and the capacity of the classical channel is 100 Gbps. In the case of a single classical signal transmitted through the classical channel, only spontaneous Raman scattering noise and channel crosstalk noise will affect the QKD system. At this time, by inputting classical signals of different wavelengths and traversing the spontaneous Raman scattering noise and channel crosstalk noise introduced into the QKD system by each classical signal, the classical channel for transmitting the classical signal corresponding to the wavelength with the smallest noise intensity is selected as the target channel allocation scheme.

[0061] In one embodiment of the present disclosure, when a classical channel transmits classical signals of multiple wavelengths, it is necessary to comprehensively consider the influence of channel crosstalk noise, spontaneous Raman scattering noise and four-wave mixing noise on the QKD system. At this time, by inputting classical signals of different wavelengths and traversing all possible channel allocation schemes through permutations and combinations, the channel allocation scheme with the smallest noise intensity generated on the quantum channel among all channel allocation schemes is selected as the target channel allocation scheme.

[0062] In one embodiment of the present disclosure, the noise intensity of the first mixed noise is expressed as follows:

[0063] p classical1 =min{p SRSi +p ci}, i∈{1,2,…,N}; (1)

[0064] Among them, p classical1 represents the noise intensity of the first mixed noise, p SRSi represents the noise intensity of spontaneous Raman scattering noise generated by the ith communication channel to the quantum channel, p ci It represents the noise intensity of the channel crosstalk noise generated by the i-th communication channel to the quantum channel, and min{} is used to calculate the minimum value of the data.

[0065] In one embodiment of the present disclosure, the noise intensity of the second mixed noise is expressed as follows:

[0066] p classical2 =min{∑p SRSi +∑p ci +∑p FWMijk};

[0067] i, j, k∈m, m∈{1,2,…,M}; (2)

[0068] Among them, p classical2 represents the noise intensity of the second mixed noise, p SRSi represents the noise intensity of spontaneous Raman scattering noise generated by the ith communication channel in the mth channel allocation scheme to the quantum channel, p cirepresents the noise intensity of the channel crosstalk noise generated by the ith communication channel in the mth channel allocation scheme to the quantum channel, p FWMijk It represents the noise intensity of the four-wave mixing noise generated by the i, j, and k communication channels in the m-th channel allocation scheme to the quantum channel. ∑() is used to calculate the sum of the data, and min{} is used to calculate the minimum value of the data.

[0069] In one embodiment of the present disclosure, if there are N available classical channels, they can be combined into M different channel allocation schemes according to business requirements. For example, if there are 10 classical channels, 5 classical channels can be selected for co-fiber transmission according to business requirements, that is, there are There are different channel allocation schemes. At this time, all different channel allocation schemes are traversed, and the channel allocation scheme with the smallest noise intensity on the quantum channel is selected as the target channel allocation scheme.

[0070] It should be noted that there is no specific limitation on how to select the target channel allocation scheme, and the embodiments of the present disclosure do not specifically limit how to select the optimal channel allocation scheme.

[0071] In one embodiment of the present disclosure, if it is in a multi-user application scenario, multi-channel QKD is required, and time division multiplexing can be used for multi-user communication.

[0072] In one embodiment of the present disclosure, conventional filtering methods based on time domain and frequency domain are compatible. For example, at the receiving end of the quantum key distribution system, time domain filtering is performed by adjusting the gate width of the single photon detector and frequency domain filtering is performed by adding a narrowband filter.

[0073] In one embodiment of the present disclosure, other common fiber transmission wavelength suppression schemes are compatible, such as selecting a quantum channel wavelength within the interval of a classical channel, thereby suppressing the classical noise introduced by the four-wave mixing effect and improving the signal-to-noise ratio of the common fiber transmission system.

[0074] In one embodiment of the present disclosure, multiplexing modules in various forms may be used. It should be noted that the multiplexing modules may be determined according to the actual transmission channel optical fiber, and wavelength division multiplexing, mode division multiplexing, and space division multiplexing may all be implemented. For example, if the transmission channel is a single-mode optical fiber, a wavelength division multiplexer and a demultiplexer may be used, i.e., a wavelength division multiplexing method; if the transmission channel is a few-mode optical fiber, a few-mode optical fiber multiplexer and a demultiplexer may be used, i.e., a mode division multiplexing method; if the transmission channel is a multi-core optical fiber, a fan-in device and a fan-out device may be used, i.e., a space division multiplexing method; if the transmission channel is a few-mode-multi-core optical fiber, a fan-in device and a fan-out device may be used, i.e., a space division multiplexing method.

[0075] In one embodiment of the present disclosure, the optimal classical signal configuration in the quantum key distribution system is selected by pre-evaluation, that is, the noise introduced into the quantum channel by classical signals of different wavelengths during co-fiber transmission is evaluated, and then the signal-to-noise ratio of all classical signal wavelengths in the co-fiber system is obtained. When configuring classical communication services, the wavelength is selected, that is, the preferred classical channel is obtained to improve the signal-to-noise ratio of the entire co-fiber transmission system. The embodiment of the present disclosure does not require any hardware modification to the classical communication equipment and the quantum key distribution equipment. It only needs to add a new internal noise evaluation process to achieve an optimized co-fiber transmission system, and it is highly practical. At the same time, it can significantly improve the performance of the co-fiber transmission system in scenarios with low optical communication capacity requirements (the equipment is not fully equipped) and high single-wave classical signal power. It is more suitable for application scenarios with low classical communication capacity and is more practical.

[0076] Figure 3 FIG. 4 is a flow chart showing another channel selection method based on co-fiber transmission in an embodiment of the present disclosure. Figure 3 As shown, the steps include:

[0077] S301, obtaining all communication channels that can be used for classic communication.

[0078] S302, filtering out communication channels that meet preset conditions, and acquiring channel transmission capability information of remaining communication channels.

[0079] In one embodiment of the present disclosure, the preset conditions are that the wavelength of the communication channel is the same as the wavelength occupied by the quantum signal module, the synchronization signal module, and the negotiation signal module, and the communication channel falls within the bandwidth of the filtering component of the multiplexing module.

[0080] S303: Generate at least one channel allocation scheme according to the service demand information and the signal transmission capability information of each communication channel.

[0081] S304, determining the noise intensity of each channel allocation scheme on the quantum channel through the communication signals of multiple different wavelengths that are initially set.

[0082] In one embodiment of the present disclosure, if the signal to be transmitted in the service demand information is a single-wavelength communication signal, then the noise intensity of the first mixed noise generated by each channel allocation scheme on the quantum channel can be determined by the above formula (1) according to the signal transmission capability information of each communication channel.

[0083] In one embodiment of the present disclosure, if the signal to be transmitted in the service demand information is a multi-wavelength communication signal, then the noise intensity of the second mixed noise generated by each channel allocation scheme on the quantum channel can be determined by the above formula (2) according to the signal transmission capability information of each communication channel.

[0084] S305: Determine a channel allocation scheme with the smallest noise intensity among at least one channel allocation scheme as a target channel allocation scheme for co-fiber transmission with the quantum channel.

[0085] In one embodiment of the present disclosure, a target channel allocation scheme with the minimum noise intensity is determined, that is, a channel allocation scheme with the highest signal-to-noise ratio is obtained, and co-fiber transmission of classical and quantum signals is performed through the target channel allocation scheme to optimize the entire co-fiber transmission system and complete the entire communication process.

[0086] As can be seen from the above, the embodiment of the present disclosure obtains the signal transmission capacity information of each communication channel, generates at least one channel allocation scheme in combination with the service demand information, and determines the noise intensity of each channel allocation scheme on the quantum channel, and determines the channel allocation scheme with the smallest noise intensity as the target channel allocation scheme for co-fiber transmission with the quantum channel. The embodiment of the present disclosure can significantly improve the performance of the co-fiber transmission system in application scenarios with low classical communication capacity.

[0087] In one embodiment of the present disclosure, it is only necessary to add a pre-noise evaluation link before the co-fiber transmission, evaluate the noise introduced by different classical channels according to the capacity requirements of classical communication, and select the classical channel with the lowest noise to optimize the co-fiber transmission system, thereby improving the signal-to-noise ratio of the co-fiber system. This solution does not require hardware modification of the optical transport network OTN and QKD equipment, can effectively improve the performance of the co-fiber transmission system, and further promote the practical development of QKD technology.

[0088] Based on the same inventive concept, the embodiment of the present disclosure also provides a channel selection device based on co-fiber transmission, as described in the following embodiment. Since the principle of solving the problem in the embodiment of the device is similar to that in the above method embodiment, the implementation of the embodiment of the device can refer to the implementation of the above method embodiment, and the repeated parts will not be repeated.

[0089] Figure 4 A schematic diagram of a channel selection device based on co-fiber transmission in an embodiment of the present disclosure is shown. Figure 4 As shown, the device includes: a transmission capability information acquisition module 401, a channel allocation scheme generation module 402, a noise intensity determination module 403 and a target channel allocation scheme selection module 404.

[0090] Among them, the transmission capacity information acquisition module 401 is used to obtain the signal transmission capacity information of each communication channel, wherein the communication channel is a transmission channel used to transmit communication signals among multiple transmission channels of shared fiber transmission; the channel allocation scheme generation module 402 is used to generate at least one channel allocation scheme according to the business demand information and the signal transmission capacity information of each communication channel, wherein each channel allocation scheme includes one or more communication channels; the noise intensity determination module 403 is used to determine the noise intensity of each channel allocation scheme to the quantum channel, wherein the quantum channel is a transmission channel used to transmit quantum signals among multiple transmission channels of shared fiber transmission; the target channel allocation scheme selection module 404 is used to determine the channel allocation scheme with the smallest noise intensity among at least one channel allocation scheme as the target channel allocation scheme for shared fiber transmission with the quantum channel.

[0091] As can be seen from the above, the embodiment of the present disclosure obtains the signal transmission capacity information of each communication channel, generates at least one channel allocation scheme in combination with the service demand information, and determines the noise intensity of each channel allocation scheme on the quantum channel, and determines the channel allocation scheme with the smallest noise intensity as the target channel allocation scheme for co-fiber transmission with the quantum channel. The embodiment of the present disclosure can significantly improve the performance of the co-fiber transmission system in application scenarios with low classical communication capacity.

[0092] In one embodiment of the present disclosure, the above-mentioned transmission capability information acquisition module 401 is also used to obtain all communication channels in the target optical network device; filter out the communication channels that meet the preset conditions in all communication channels, and obtain the signal transmission capability information of the remaining communication channels, wherein the preset condition is that the communication channel belongs to the communication channel in the filtering component in the target optical network device.

[0093] In one embodiment of the present disclosure, the noise of each channel allocation scheme on the quantum channel includes at least any one of the following: channel crosstalk noise, spontaneous Raman scattering noise or four-wave mixing noise.

[0094] In one embodiment of the present disclosure, the noise intensity determination module 403 is further used to determine, if the signal to be transmitted in the service demand information is a single-wavelength communication signal, the noise intensity of the first mixed noise generated by each channel allocation scheme on the quantum channel according to the signal transmission capability information of each communication channel, wherein the first mixed noise is the noise generated by the mixture of channel crosstalk noise and spontaneous Raman scattering noise; if the signal to be transmitted in the service demand information is a multi-wavelength communication signal, the noise intensity of the second mixed noise generated by each channel allocation scheme on the quantum channel according to the signal transmission capability information of each communication channel, wherein the second mixed noise is the noise generated by the mixture of channel crosstalk noise, spontaneous Raman scattering noise and four-wave mixing noise.

[0095] In one embodiment of the present disclosure, the noise intensity of the first mixed noise is calculated by the above formula (1).

[0096] In one embodiment of the present disclosure, the noise intensity of the second mixed noise is calculated by the above formula (2).

[0097] In one embodiment of the present disclosure, it is assumed that the quantum channel is 1550.12 nm and the capacity of the classical channel is 100 Gbps. In the case of a single classical signal transmitted through the classical channel, only spontaneous Raman scattering noise and channel crosstalk noise will affect the QKD system. At this time, by inputting classical signals of different wavelengths and traversing the spontaneous Raman scattering noise and channel crosstalk noise introduced into the QKD system by each classical signal, the classical channel for transmitting the classical signal corresponding to the wavelength with the smallest noise intensity is selected as the target channel allocation scheme.

[0098] In one embodiment of the present disclosure, when a classical channel transmits classical signals of multiple wavelengths, it is necessary to comprehensively consider the influence of channel crosstalk noise, spontaneous Raman scattering noise and four-wave mixing noise on the QKD system. At this time, by inputting classical signals of different wavelengths and traversing all possible channel allocation schemes through permutations and combinations, the channel allocation scheme with the smallest noise intensity generated on the quantum channel among all channel allocation schemes is selected as the target channel allocation scheme.

[0099] In one embodiment of the present disclosure, if it is in a multi-user application scenario, multi-channel QKD is required, and time division multiplexing can be used for multi-user communication.

[0100] In one embodiment of the present disclosure, conventional filtering methods based on time domain and frequency domain are compatible. For example, at the receiving end of the quantum key distribution system, time domain filtering is performed by adjusting the gate width of the single photon detector and frequency domain filtering is performed by adding a narrowband filter.

[0101] In one embodiment of the present disclosure, other common fiber transmission wavelength suppression schemes are compatible, such as selecting a quantum channel wavelength within the interval of a classical channel, thereby suppressing the classical noise introduced by the four-wave mixing effect and improving the signal-to-noise ratio of the common fiber transmission system.

[0102] In one embodiment of the present disclosure, multiplexing modules in various forms may be used. It should be noted that the multiplexing modules may be determined according to the actual transmission channel optical fiber, and wavelength division multiplexing, mode division multiplexing, and space division multiplexing may all be implemented. For example, if the transmission channel is a single-mode optical fiber, a wavelength division multiplexer and a demultiplexer may be used, i.e., a wavelength division multiplexing method; if the transmission channel is a few-mode optical fiber, a few-mode optical fiber multiplexer and a demultiplexer may be used, i.e., a mode division multiplexing method; if the transmission channel is a multi-core optical fiber, a fan-in device and a fan-out device may be used, i.e., a space division multiplexing method; if the transmission channel is a few-mode-multi-core optical fiber, a fan-in device and a fan-out device may be used, i.e., a space division multiplexing method.

[0103] In one embodiment of the present disclosure, the optimal classical signal configuration in the quantum key distribution system is selected by pre-evaluation, that is, the noise introduced into the quantum channel by classical signals of different wavelengths during co-fiber transmission is evaluated, and then the signal-to-noise ratio of all classical signal wavelengths in the co-fiber system is obtained. When configuring classical communication services, the wavelength is selected, that is, the preferred classical channel is obtained to improve the signal-to-noise ratio of the entire co-fiber transmission system. The embodiment of the present disclosure does not require any hardware modification to the classical communication equipment and the quantum key distribution equipment. It only needs to add a new internal noise evaluation process to achieve an optimized co-fiber transmission system, and it is highly practical. At the same time, it can significantly improve the performance of the co-fiber transmission system in scenarios with low optical communication capacity requirements (the equipment is not fully equipped) and high single-wave classical signal power. It is more suitable for application scenarios with low classical communication capacity and is more practical.

[0104] It should be noted that the examples and application scenarios implemented by the modules in the above-mentioned device embodiment are the same as those of the corresponding steps in the method embodiment, but are not limited to the contents disclosed in the above-mentioned method embodiment. It should be noted that the above-mentioned modules as part of the device can be executed in a computer system such as a set of computer executable instructions.

[0105] Those skilled in the art will appreciate that various aspects of the present disclosure may be specifically implemented in the following forms, namely: a complete hardware implementation, a complete software implementation (including firmware, microcode, etc.), or an implementation that combines hardware and software aspects, which may be collectively referred to herein as a "circuit," "module," or "system."

[0106] Based on the same inventive concept, an electronic device is also provided in an embodiment of the present disclosure, the electronic device comprising: a processor; and a memory for storing executable instructions of the processor; wherein the processor is configured to execute any one of the above-mentioned channel selection methods based on co-fiber transmission by executing the executable instructions. Since the principle of solving the problem in the electronic device embodiment is similar to that in the above-mentioned method embodiment, the implementation of the electronic device embodiment can refer to the implementation of the above-mentioned method embodiment, and the repeated parts will not be repeated.

[0107] Refer to the following Figure 5 The electronic device 500 according to this embodiment of the present disclosure is described. Figure 5 The electronic device 500 shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present disclosure.

[0108] like Figure 5 As shown, the electronic device 500 is in the form of a general computing device. The components of the electronic device 500 may include but are not limited to: at least one processing unit 510, at least one storage unit 520, and a bus 530 connecting different system components (including the storage unit 520 and the processing unit 510).

[0109] The storage unit stores a program code, and the program code can be executed by the processing unit 510, so that the processing unit 510 executes the steps described in the above "Exemplary Method" section of this specification according to various exemplary embodiments of the present disclosure. For example, the processing unit 510 can execute the following steps of the above method embodiment: obtaining signal transmission capability information of each communication channel, wherein the communication channel is a transmission channel for transmitting communication signals among multiple transmission channels of co-fiber transmission; generating at least one channel allocation scheme according to business demand information and signal transmission capability information of each communication channel, wherein each channel allocation scheme includes one or more communication channels; determining the noise intensity of each channel allocation scheme to the quantum channel, wherein the quantum channel is a transmission channel for transmitting quantum signals among multiple transmission channels of co-fiber transmission; determining the channel allocation scheme with the smallest noise intensity among at least one channel allocation scheme as the target channel allocation scheme for co-fiber transmission with the quantum channel.

[0110] The storage unit 520 may include a readable medium in the form of a volatile storage unit, such as a random access storage unit (RAM) 5201 and / or a cache storage unit 5202 , and may further include a read-only storage unit (ROM) 5203 .

[0111] The storage unit 520 may also include a program / utility 5204 having a set (at least one) of program modules 5205, such program modules 5205 including but not limited to: an operating system, one or more application programs, other program modules, and program data, each of which or some combination may include an implementation of a network environment.

[0112] Bus 530 may represent one or more of several types of bus structures, including a memory unit bus or memory unit controller, a peripheral bus, an accelerated graphics port, a processing unit, or a local bus using any of a variety of bus architectures.

[0113] The electronic device 500 may also communicate with one or more external devices 540 (e.g., keyboards, pointing devices, Bluetooth devices, etc.), may also communicate with one or more devices that enable a user to interact with the electronic device 500, and / or communicate with any device that enables the electronic device 500 to communicate with one or more other computing devices (e.g., routers, modems, etc.). Such communication may be performed via an input / output (I / O) interface 550. Furthermore, the electronic device 500 may also communicate with one or more networks (e.g., local area networks (LANs), wide area networks (WANs), and / or public networks, such as the Internet) via a network adapter 560. As shown, the network adapter 560 communicates with other modules of the electronic device 500 via a bus 530. It should be understood that, although not shown in the figure, other hardware and / or software modules may be used in conjunction with the electronic device 500, including but not limited to: microcode, device drivers, redundant processing units, external disk drive arrays, RAID systems, tape drives, and data backup storage systems.

[0114] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a terminal device, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0115] Based on the same inventive concept, a computer-readable storage medium is also provided in an embodiment of the present disclosure, on which a computer program is stored, and when the computer program is executed by a processor, any one of the above-mentioned channel selection methods based on co-fiber transmission is implemented. Since the principle of solving the problem in the embodiment of the computer-readable storage medium is similar to that in the above-mentioned method embodiment, the implementation of the embodiment of the computer-readable storage medium can refer to the implementation of the above-mentioned method embodiment, and the repeated parts will not be repeated.

[0116] More specific examples of computer-readable storage media in the present disclosure may include, but are not limited to, an electrical connection having one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing.

[0117] In the present disclosure, a computer readable storage medium may include a data signal propagated in baseband or as part of a carrier wave, wherein a readable program code is carried. Such propagated data signals may take a variety of forms, including but not limited to electromagnetic signals, optical signals, or any suitable combination of the above. A readable signal medium may also be any readable medium other than a readable storage medium, which may send, propagate, or transmit a program for use by or in conjunction with an instruction execution system, apparatus, or device.

[0118] Alternatively, the program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to wireless, wired, optical cable, RF, etc., or any suitable combination of the foregoing.

[0119] In a specific implementation, the program code for performing the operations of the present disclosure may be written in any combination of one or more programming languages, including object-oriented programming languages ​​such as Java, C++, etc., and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as a separate software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computing device (e.g., using an Internet service provider to connect through the Internet).

[0120] Based on the same inventive concept, a computer program product is also provided in an embodiment of the present disclosure, including a computer program product, including: a computer program or an instruction, which, when executed by a processor, implements any one of the channel selection methods based on co-fiber transmission in the above method embodiments. Since the principle of solving the problem in the computer program product embodiment is similar to that in the above method embodiment, the implementation of the computer program product embodiment can refer to the implementation of the above method embodiment, and the repeated parts will not be repeated.

[0121] It should be noted that, although several modules or units of the device for action execution are mentioned in the above detailed description, this division is not mandatory. In fact, according to the embodiments of the present disclosure, the features and functions of two or more modules or units described above can be embodied in one module or unit. On the contrary, the features and functions of one module or unit described above can be further divided into multiple modules or units to be embodied.

[0122] In addition, although the steps of the method in the present disclosure are described in a specific order in the drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0123] Through the description of the above implementation, it is easy for those skilled in the art to understand that the example implementation described here can be implemented by software, or by software combined with necessary hardware. Therefore, the technical solution according to the implementation of the present disclosure can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, a USB flash drive, a mobile hard disk, etc.) or on a network, including several instructions to enable a computing device (which can be a personal computer, a server, a mobile terminal, or a network device, etc.) to execute the method according to the implementation of the present disclosure.

[0124] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A channel selection method based on co-fiber transmission, characterized in that: include: Acquire signal transmission capability information of each communication channel, wherein the communication channel is a transmission channel for transmitting communication signals among a plurality of transmission channels of co-fiber transmission; generating at least one channel allocation scheme according to the service demand information and the signal transmission capability information of each communication channel, wherein each channel allocation scheme includes one or more communication channels; Determine the noise intensity of each channel allocation scheme on a quantum channel, wherein the quantum channel is a transmission channel for transmitting quantum signals among a plurality of transmission channels of co-fiber transmission; The channel allocation scheme with the smallest noise intensity among the at least one channel allocation scheme is determined as the target channel allocation scheme for co-fiber transmission with the quantum channel.

2. The channel selection method based on co-fiber transmission according to claim 1, characterized in that: The obtaining of the signal transmission capability information of each communication channel includes: Acquire all communication channels in the target optical network device; Filter out the communication channels that meet a preset condition from among all the communication channels, and obtain signal transmission capability information of the remaining communication channels, wherein the preset condition is that the communication channel belongs to a communication channel in a filter component in the target optical network device.

3. The channel selection method based on co-fiber transmission according to claim 1, characterized in that: The noise of each channel allocation scheme on the quantum channel includes at least one of the following: channel crosstalk noise, spontaneous Raman scattering noise or four-wave mixing noise.

4. The channel selection method based on co-fiber transmission according to claim 3, characterized in that: The step of determining the noise intensity of each channel allocation scheme on the quantum channel comprises: If the signal to be transmitted in the service demand information is a single-wavelength communication signal, then determining the noise intensity of the first mixed noise generated by each channel allocation scheme on the quantum channel according to the signal transmission capability information of each communication channel, wherein the first mixed noise is the noise generated by the mixing of channel crosstalk noise and spontaneous Raman scattering noise; If the signal to be transmitted in the service demand information is a multi-wavelength communication signal, the noise intensity of the second mixed noise generated by each channel allocation scheme on the quantum channel is determined according to the signal transmission capability information of each communication channel, wherein the second mixed noise is the noise generated by the mixture of channel crosstalk noise, spontaneous Raman scattering noise and four-wave mixing noise.

5. The channel selection method based on co-fiber transmission according to claim 4, characterized in that: The noise intensity of the first mixed noise is expressed as follows: on classical1 =min{p SRSi +p ci },i∈{1,2,.....,N}; Among them, p classical1 represents the noise intensity of the first mixed noise, p SRSi represents the noise intensity of spontaneous Raman scattering noise generated by the ith communication channel to the quantum channel, p ci It represents the noise intensity of the channel crosstalk noise generated by the i-th communication channel to the quantum channel, and min{} is used to calculate the minimum value of the data.

6. The channel selection method based on co-fiber transmission according to claim 4, characterized in that: The noise intensity of the second mixed noise is expressed as follows: p classical2 =min{∑p SRSi +∑p ci +∑p FWijk }; i, j, k∈m, m∈{1, 2,..., M}; Among them, p classical2 represents the noise intensity of the second mixed noise, p SRSi represents the noise intensity of spontaneous Raman scattering noise generated by the ith communication channel in the mth channel allocation scheme to the quantum channel, p ci represents the noise intensity of the channel crosstalk noise generated by the ith communication channel in the mth channel allocation scheme to the quantum channel, p FWMijk It represents the noise intensity of the four-wave mixing noise generated by the i, j, and k communication channels in the m-th channel allocation scheme to the quantum channel. ∑() is used to calculate the sum of the data, and min{} is used to calculate the minimum value of the data.

7. A channel selection device based on co-fiber transmission, characterized in that: include: A transmission capacity information acquisition module, used to acquire signal transmission capacity information of each communication channel, wherein the communication channel is a transmission channel used to transmit communication signals among multiple transmission channels of co-fiber transmission; A channel allocation scheme generating module, used to generate at least one channel allocation scheme according to the service demand information and the signal transmission capability information of each communication channel, wherein each channel allocation scheme includes one or more communication channels; A noise intensity determination module, used to determine the noise intensity of each channel allocation scheme on a quantum channel, wherein the quantum channel is a transmission channel for transmitting quantum signals among multiple transmission channels of co-fiber transmission; The target channel allocation scheme selection module is used to determine the channel allocation scheme with the smallest noise intensity among the at least one channel allocation scheme as the target channel allocation scheme for co-fiber transmission with the quantum channel.

8. An electronic device, characterized in that: include: processor; as well as A memory, configured to store executable instructions of the processor; The processor is configured to execute the channel selection method based on common fiber transmission as described in any one of claims 1 to 6 by executing the executable instructions.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the channel selection method based on common fiber transmission described in any one of claims 1 to 6 is implemented.

10. A computer program product comprising: A computer program or instruction, characterized in that when the computer program or instruction is executed by a processor, it implements the channel selection method based on common fiber transmission as described in any one of claims 1 to 6.

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