CN107204812B - The method and device of quantum key distribution and passive optical access network fusion - Google Patents
The method and device of quantum key distribution and passive optical access network fusion Download PDFInfo
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- CN107204812B CN107204812B CN201610161612.8A CN201610161612A CN107204812B CN 107204812 B CN107204812 B CN 107204812B CN 201610161612 A CN201610161612 A CN 201610161612A CN 107204812 B CN107204812 B CN 107204812B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
- H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
- H04L9/0852—Quantum cryptography
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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Abstract
The invention discloses the method and devices that a kind of quantum key distribution and passive optical access network merge, in the program, quantum signal light carries out partial wave and multiplex when passing through optical splitting point, and bypasses optical splitter, the splitting loss for avoiding optical splitter introducing solves the problems, such as that splitting ratio restricts transmission range.Meanwhile improve the signal-to-noise ratio of QKD (quantum key distribution), thus improve QKD at code rate and other performance indicators.Using WDM (wavelength-division multiplex) technology, quantum signal is transmitted on original optical fiber for carrying classical channel, has saved fiber resource, further realizes that large-scale engineering and functionization are laid a good foundation for quantum communications.
Description
Technical field
The present invention relates to optical fiber transmission of quantum fields of communication technology more particularly to a kind of quantum key distribution and passive light to connect
Network the method and device merged.
Background technique
Quantum communications are emerging cross discipline of the quantum mechanics in conjunction with information theory, mainly using entangled quantum effect into
Row information transmitting.Quantum communications include the researchs sides such as quantum key distribution, Quantum Secure Direct Communication, quanta identity authentication
To, and quantum key distribution is research emphasis therein, and the subject for experimental demonstration verifying and practical application of marching toward at first
Direction.Since quantum key distribution is to add the communication mode of " one-time pad " based on quantum-mechanical basic principle,
It is any by physics law dominate cryptanalysis person can not be implemented in classical cryptographic system frequently with attack method, and
Other any attack methods, to ensure that quantum communications are at the unconditional security of physics level.Quantum communications are not only
There are great application value and prospect in information security fields such as national security, finance, and gradually comes into the daily of people
Life.
Communication channel is classical information or quantum information according to the information of its transmitting, is divided into classical channel and quantum letter
Road.Classical channel is used to transmit classical information, and each light pulse includes several hundred million a photons.Quantum channel is used to transmit quantum letter
Breath, each light pulse is single photon rank.If transmitted in same root optical fiber, the spontaneous drawing of high-power classics channel generation
Graceful shot noise can interfere quantum channel, operate quantum channel can not, and experiment and try net all use solely at present
Vertical optical fiber carries quantum information.
Fiber resource is not available anywhere, and expensive.As government formulates national broadband development strategy, in recent years
The development that Chinese broadband access network is advanced by leaps and bounds: most places can provide several million to tens Netowrk tape for user
Width, some developed provinces and cities inner cities are even up to 100,000,000 or more.High bandwidth consumes more fiber resources, many regions
Fiber resource is all at full stretch, and the problem of fibre core resource scarcity is particularly acute in backbone network." six vertical six is horizontal " the national bone in China
In dry net, for partial sector without spare fibre, it is logical also to become the following building quantum for the strong influence safety of network
One obstacle of communication network.
Summary of the invention
It, can be with the object of the present invention is to provide the method and device that a kind of quantum key distribution and passive optical access network merge
Quantum signal is transmitted on the optical fiber of carrying classical signals, has saved fiber resource, and realize that interconnection is mutual at code rate with higher
It is logical.
The purpose of the present invention is what is be achieved through the following technical solutions:
A kind of method of quantum key distribution and passive optical access network fusion, comprising:
Quantum key distribution QKD sender's quantum signal light, the optical network unit ONU hair of passive optical access network PON
Allusion quotation signal light of passing through is served, the optical line terminal OLT of PON sends downlink classical signals light；
Quantum signal light is transmitted to the second optical device after merging with downlink classical signals light through the first optical device, by
By quantum signal light and downlink classical signals light partial wave, the downlink classical signals light after partial wave is divided two optical devices by 1:N
Third optical device is input to after device, the quantum signal light after partial wave directly inputs third optical device；By third optical device
The 4th optical device is transmitted to after downlink classical signals light after light splitting is merged with quantum signal light；It will by the 4th optical device
Quantum signal light and downlink classical signals light partial wave；Quantum signal light after partial wave is input to QKD recipient, by QKD recipient
It is measured using quantum signal light of the detector to input, completes quantum communications；Downlink classical signals light input after partial wave
To ONU, downlink classical communication is completed；
Uplink classical signals light pass sequentially through the 4th optical device, third optical device, optical splitter, the second optical device with
It is input to OLT after first optical device, completes uplink classical communication.
Further, first optical device, the second optical device, third optical device and the 4th optics device are wavelength-division
Multiplexer.
A kind of method of quantum key distribution and passive optical access network fusion, comprising:
Quantum key distribution QKD sender's quantum signal light, the optical network unit ONU hair of passive optical access network PON
Allusion quotation signal light of passing through is served, the optical line terminal OLT of PON sends downlink classical signals light；
Quantum signal light is transmitted to the second optical device after merging with uplink classical signals light through the first optical device, by
By quantum signal light and uplink classical signals light partial wave, the uplink classical signals light after partial wave is divided two optical devices by 1:N
Third optical device is input to after device, the quantum signal light after partial wave directly inputs third optical device；By third optical device
The 4th optical device is transmitted to after uplink classical signals light after light splitting is merged with quantum signal light；It will by the 4th optical device
Quantum signal light and uplink classical signals light partial wave；Quantum signal light after partial wave is input to QKD recipient, by QKD recipient
It is measured using quantum signal light of the detector to input, completes quantum communications；Uplink classical signals light input after partial wave
To OLT, uplink classical communication is completed；
Downlink classical signals light pass sequentially through the 4th optical device, third optical device, optical splitter, the second optical device with
It is input to ONU after first optical device, completes downlink classical communication.
Further, first optical device, the second optical device, third optical device and the 4th optics device are wavelength-division
Multiplexer.
A kind of device of quantum key distribution and passive optical access network fusion, comprising:
Quantum key distribution QKD sender, the optical line terminal OLT of passive optical access network PON, the first optical device,
One channel, the second optical device, 1:N optical splitter, third optical device, second channel, the 4th optical device, QKD recipient,
The optical network unit ONU of PON；Wherein:
QKD sender is connected with the port 3B of the first optical device, and OLT is connected with the port 3C of the first optical device, the
The port 3A of one optical device is connected by the first channel with the port 5A of the second optical device；
The port 5C of second optical device is connected with 1:N optical splitter, the port 7C phase of 1:N optical splitter and third optical device
Even, the port 5B of the second optical device is connected with the port 7B of third optical device；The port 7A of third optical device passes through the
Two channels are connected with the port 9A of the 4th optical device, and the port 9B of the 4th optical device is connected with QKD recipient, the 4th optics
The port 9C of device is connected with ONU.
Further, first optical device, the second optical device, third optical device and the 4th optics device are wavelength-division
Multiplexer.
A kind of device of quantum key distribution and passive optical access network fusion, comprising:
Quantum key distribution QKD sender, the optical line terminal OLT of passive optical access network PON, the first optical device,
One channel, the second optical device, 1:N optical splitter, third optical device, second channel, the 4th optical device, QKD recipient,
The optical network unit ONU of PON；Wherein:
QKD sender is connected with the port 3B of the first optical device, and ONU is connected with the port 3C of the first optical device, the
The port 3A of one optical device is connected by the first channel with the port 5A of the second optical device；
The port 5C of second optical device is connected with 1:N optical splitter, the port 7C phase of 1:N optical splitter and third optical device
Even, the port 5B of the second optical device is connected with the port 7B of third optical device；The port 7A of third optical device passes through the
Two channels are connected with the port 9A of the 4th optical device, and the port 9B of the 4th optical device is connected with QKD recipient, the 4th optics
The port 9C of device is connected with OLT.
Further, first optical device, the second optical device, third optical device and the 4th optics device are wavelength-division
Multiplexer.
As seen from the above technical solution provided by the invention, partial wave and conjunction are carried out when quantum signal light passes through optical splitting point
Wave, and optical splitter is bypassed, the splitting loss of optical splitter introducing is avoided, solves the problems, such as that splitting ratio restricts transmission range.
Meanwhile improve the signal-to-noise ratio of QKD (quantum key distribution), thus improve QKD at code rate and other performance indicators.It utilizes
WDM (wavelength-division multiplex) technology transmits quantum signal on original optical fiber for carrying classical channel, has saved fiber resource, for amount
Son communication is further to realize that large-scale engineering and functionization are laid a good foundation.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for this
For the those of ordinary skill in field, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is the process of the method for a kind of quantum key distribution provided in an embodiment of the present invention and passive optical access network fusion
Figure；
Fig. 2 is the signal of the device of a kind of quantum key distribution provided in an embodiment of the present invention and passive optical access network fusion
Figure；
Fig. 3 is showing for the device of another quantum key distribution provided in an embodiment of the present invention and passive optical access network fusion
It is intended to.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, every other implementation obtained by those of ordinary skill in the art without making creative efforts
Example, belongs to protection scope of the present invention.
The embodiment of the present invention provides the method for a kind of quantum key distribution and passive optical access network fusion.As shown in Figure 1, its
Mainly include the following steps:
Step S1, the optical network unit ONU of QKD sender quantum signal light, PON sends uplink classical signals light,
The optical line terminal OLT of PON sends downlink classical signals light.
In the embodiment of the present invention, QKD sender's Alice quantum signal light, the quantum signal light includes signal light
And synchronizable optical, the signal light have first wave length λ1Central wavelength, the synchronizable optical have second wave length λ2Middle cardiac wave
It is long.The ONU, which sends uplink classical signals light, has third wavelength X3Central wavelength；The OLT sends downlink classical signals
Light has the 4th wavelength X4Central wavelength.
Step S2, quantum light is merged with classical light, reaches partial wave after optical splitting point, the quantum light after partial wave is around light splitting
Device, the classical light after partial wave are merged with quantum light again after optical splitter is divided.
Due to the link load about 16dB that existing QKD system can be born, if using quantum signal light by being divided
The scheme of device, then splitting ratio reaches 1:32, the splitting loss about 15dB that optical splitter introduces, along with the loss of optical fiber, by because
Excessive for quantum signal optical link loss, QKD system is unable to run, and can not be registered one's residence by wavelength-division multiplex and be realized quantum key point
Hair.In the embodiment of the present invention, the link load of quantum signal light and the splitting ratio of optical splitter are unrelated, to solve optical splitter
Splitting loss constrains the problem of transmission range.
Step S3, partial wave is carried out again to the multiplex of classical signals light and quantum signal light, so that quantum signal light is passed
QKD recipient is transported to for measuring quantum state, and downlink classical signals light is transferred to ONU to carry out downlink classical communication,
Uplink classical signals light is transferred to OLT to carry out uplink classical communication.
In order to make it easy to understand, being described in detail below with reference to two specific embodiment schemes described in Fig. 1.
Embodiment one
In the embodiment of the present invention, quantum key distribution QKD sender's quantum signal light, passive optical access network PON's
Optical network unit ONU sends uplink classical signals light, and the optical line terminal OLT of PON sends downlink classical signals light；
Quantum signal light is transmitted to the second optical device after merging with downlink classical signals light through the first optical device, by
By quantum signal light and downlink classical signals light partial wave, the downlink classical signals light after partial wave is divided two optical devices by 1:N
Third optical device is input to after device, the quantum signal light after partial wave directly inputs third optical device；By third optical device
The 4th optical device is transmitted to after downlink classical signals light after light splitting is merged with quantum signal light；It will by the 4th optical device
Quantum signal light and downlink classical signals light partial wave；Quantum signal light after partial wave is input to QKD recipient, by QKD recipient
It is measured using quantum signal light of the detector to input, completes quantum communications；Downlink classical signals light input after partial wave
To ONU, downlink classical communication is completed；
Uplink classical signals light pass sequentially through the 4th optical device, third optical device, optical splitter, the second optical device with
It is input to OLT after first optical device, completes uplink classical communication.
Embodiment two
In the embodiment of the present invention, quantum key distribution QKD sender's quantum signal light, passive optical access network PON's
Optical network unit ONU sends uplink classical signals light, and the optical line terminal OLT of PON sends downlink classical signals light；
Quantum signal light is transmitted to the second optical device after merging with uplink classical signals light through the first optical device, by
By quantum signal light and uplink classical signals light partial wave, the uplink classical signals light after partial wave is divided two optical devices by 1:N
Third optical device is input to after device, the quantum signal light after partial wave directly inputs third optical device；By third optical device
The 4th optical device is transmitted to after uplink classical signals light after light splitting is merged with quantum signal light；It will by the 4th optical device
Quantum signal light and uplink classical signals light partial wave；Quantum signal light after partial wave is input to QKD recipient, by QKD recipient
It is measured using quantum signal light of the detector to input, completes quantum communications；Uplink classical signals light input after partial wave
To OLT, uplink classical communication is completed；
Downlink classical signals light pass sequentially through the 4th optical device, third optical device, optical splitter, the second optical device with
It is input to ONU after first optical device, completes downlink classical communication.
In above-mentioned two embodiment, first optical device, the second optical device, third optical device and the 4th optics
Device is wavelength division multiplexer；For example, Coarse Wave Division Multiplexer (CWMD), filter disc type wavelength division multiplexer (FWMD), dense wavelength division multiplexing
Device (DWMD), grating etc..
In the above scheme of the embodiment of the present invention, progress partial wave and multiplex when quantum signal light passes through optical splitting point, and around
Optical splitter is crossed, the splitting loss of optical splitter introducing is avoided, solves the problems, such as that splitting ratio restricts transmission range.Meanwhile it improving
The signal-to-noise ratio of QKD (quantum key distribution), thus improve QKD at code rate and other performance indicators.Utilize WDM (wavelength-division
Multiplexing) technology, transmit quantum signal on original optical fiber for carrying classical channel, saved fiber resource, be quantum communications into
The realization large-scale engineering of one step and functionization are laid a good foundation.
The embodiment of the present invention also provides the device of a kind of quantum key distribution and passive optical access network fusion, for realizing with
Method described in embodiment one and embodiment two.
Embodiment three
As shown in Fig. 2, for a kind of dress of quantum key distribution and passive optical access network fusion provided in an embodiment of the present invention
It sets, specifically includes that quantum key distribution QKD sender 1, the optical line terminal OLT 2 of passive optical access network PON, the first light
Learn device 3, the first channel 4, the second optical device 5,1:N optical splitter 6, third optical device 7, second channel 8, the 4th optics device
Part 9, QKD recipient 10, PON optical network unit ONU 11.
The first optical device, the second optical device, third optical device in the embodiment of the present invention are with the 4th optics device
Wavelength division multiplexer；For example, Coarse Wave Division Multiplexer (CWMD), filter disc type wavelength division multiplexer (FWMD), dense wavelength division multiplexing device
(DWMD), grating etc..
Each optical device is configured with tri- ports A, B, C；As it was noted above, the quantum signal light includes
Signal light and synchronizable optical, the signal light have first wave length λ1Central wavelength, the synchronizable optical have second wave length λ2In
Cardiac wave is long.The ONU, which sends uplink classical signals light, has third wavelength X3Central wavelength；It is classical that the OLT sends downlink
Signal light has the 4th wavelength X4Central wavelength.
In the embodiment of the present invention, set according to signal light of the wavelength to the input and output of each port；For example, the end A
Mouth is configured to that wavelength is allowed to be λ1、λ2、λ3、λ4, signal light passes through；The port B is configured to that wavelength is allowed to be λ1、λ2Signal light it is logical
It crosses；Port C is configured to that wavelength is allowed to be λ3、λ4Signal light pass through.
In the embodiment of the present invention, each optical device can all may be used with two-way operation, i.e. tri- ports A, B, C
To allow the signal light of specific wavelength to input and output.
In the embodiment of the present invention, 1:N optical splitter 6 be may be configured to when light is inputted from conjunction beam port, from any one
Beam splitting port output intensity is the light for closing beam port intensity 1/N；When light is inputted from any one beam splitting port, from conjunction beam port
Output intensity is the light of beam splitting port intensity 1/N.
In the embodiment of the present invention, the first channel 4 and second channel 8 can be optical fiber.
The structural relation of Fig. 2 shown device is as follows:
QKD sender is connected with the port 3B of the first optical device, and OLT is connected with the port 3C of the first optical device, the
The port 3A of one optical device is connected by the first channel with the port 5A of the second optical device；
The port 5C of second optical device is connected with 1:N optical splitter, the port 7C phase of 1:N optical splitter and third optical device
Even, the port 5B of the second optical device is connected with the port 7B of third optical device；The port 7A of third optical device passes through the
Two channels are connected with the port 9A of the 4th optical device, and the port 9B of the 4th optical device is connected with QKD recipient, the 4th optics
The port 9C of device is connected with ONU.
Its course of work is as follows:
When carrying out the process of downlink classical communication and quantum communications, it include central wavelength is that QKD sender 1, which sends,
One wavelength X1Signal light and central wavelength be second wave length λ2Synchronizable optical quantum signal light, be input to the first optical device 3
Port 3B.The 2 dispatching centre wavelength of optical line terminal OLT of PON is the 4th wavelength X4Downlink classical signals light, be input to
The port 3C of first optical device 3.
At the first optical device 3, the first optical device 3 can be first wave to the central wavelength inputted at the 3B of port
Long λ1It is second wave length λ with central wavelength2Light and at the 3C of port input central wavelength be the 4th wavelength X4Light carry out
Multiplex makes the light of these three wavelength multiplex at the 3A of port export and be transmitted to the second optical device 5 through the first channel 4.
At the second optical device 5, the second optical device 5 can include that central wavelength is distinguished by what is inputted at the 5A of port
For first wave length λ1, second wave length λ2With the 4th wavelength X4Light multiplex carry out partial wave so that central wavelength be λ4Under pass through
Allusion quotation signal light is exported at the 5C of port to the conjunction Shu Duan of 1:N optical splitter, and at its beam splitting end, output is divided all the way after 1:N optical splitter
The road Bing Jianggai is divided the port 7C for being transmitted to third optical device 7；Central wavelength is made to be respectively first wave length λ simultaneously1With
Two wavelength Xs2Quantum signal light exported at the 5B of port, and be transmitted to the port 7B of third optical device 7.
At third optical device 7, the central wavelength inputted at the 7B of port is first wave length λ by third optical device 71
It is second wave length λ with central wavelength2Quantum signal light with the 7C of port at input central wavelength be the 4th wavelength X4Downlink
Classical signals light carries out multiplex, and the light of these three wavelength multiplex at the 7A of port is made to export and be transmitted to the 4th through second channel 8
Optical device 9.In this way, central wavelength is first wave length λ1With second wave length λ2Quantum signal light can avoid 1:N optical splitter,
To avoid the splitting loss as caused by optical splitter.
At the 4th optical device 9, the 4th optical device 9 include central wavelength is respectively the by what is inputted at the 9A of port
One wavelength X1, second wave length λ2With the 4th wavelength X4Signal light multiplex carry out partial wave so that central wavelength is respectively first wave
Long λ1With second wave length λ2Quantum signal light export and be transmitted to QKD recipient 10 at the 9B of port, QKD recipient is by quantum
Signal light is measured with detector, completes quantum communications；Meanwhile by central wavelength be the 4th wavelength X4Downlink classical signals
Light exports at the 9C of port and is transmitted to the optical network unit ONU 11 of PON, to complete downlink classical communication.
The 11 dispatching centre wavelength of optical network unit ONU of PON is λ3Uplink classical signals light, and be transmitted to the 4th light
Learn the port 9C of device 9.The central wavelength inputted in port 9C is third wavelength X by the 4th optical device 93Uplink classics letter
Number photosynthetic wave exports it in port 9A and is transmitted to the port 7A of third optical device 7 through second channel 8.In third optics
At device 7, central wavelength is third wavelength X by third optical device 73Uplink classical signals light carry out partial wave, holding it
Mouth 7C is exported and is transmitted to a beam splitting end of 1:N optical splitter 6.Central wavelength is third wavelength X3Uplink classical signals light warp
The conjunction beam end of optical splitter 6 exports and is transmitted to the port 5C of the second optical device 5,5 centering cardiac wave of the second optical device a length of
Wavelength lambda3The photosynthetic wave of uplink classical signals, export it at the 5A of port and be transmitted to the first optics device through the first channel 4
The port 3A of part 3.First optical device 3 can be third wavelength X to the central wavelength inputted at the 3A of port3Uplink it is classical
Signal light carries out partial wave, exports it at the 3C of port to be transmitted to the optical line terminal OLT 2 of PON, to pass through on completing
Allusion quotation communication.
Example IV
As shown in figure 3, merged for another quantum key distribution provided in an embodiment of the present invention and passive optical access network
Device.
The principle of the device is similar with the principle of Fig. 2 shown device, and the difference of the two is to have exchanged OLT 2 and ONU 11
Position, and the conjunction Shu Duanyu beam splitting end of beam splitter 6 is exchanged simultaneously, i.e. the conjunction Shu Duan of holding OLT 2 and beam splitter 6 is same
The beam splitting end of side, ONU 11 and beam splitter 6 is in the same side.
The structural relation of Fig. 3 shown device is as follows:
QKD sender is connected with the port 3B of the first optical device, and ONU is connected with the port 3C of the first optical device, the
The port 3A of one optical device is connected by the first channel with the port 5A of the second optical device；
The port 5C of second optical device is connected with 1:N optical splitter, the port 7C phase of 1:N optical splitter and third optical device
Even, the port 5B of the second optical device is connected with the port 7B of third optical device；The port 7A of third optical device passes through the
Two channels are connected with the port 9A of the 4th optical device, and the port 9B of the 4th optical device is connected with QKD recipient, the 4th optics
The port 9C of device is connected with OLT.
Its course of work is as follows:
When carrying out the process of uplink classical communication and quantum communications, it include central wavelength is that QKD sender 1, which sends,
One wavelength X1Signal light and central wavelength be second wave length λ2Synchronizable optical quantum signal light, be input to the first optical device 3
Port 3B.11 dispatching centre wavelength of ONU is third wavelength X3Uplink classical signals light, be input to the first optical device 3
Port 3C.
At the first optical device 3, the first optical device 3 can be first wave to the central wavelength inputted at the 3B of port
Long λ1It is second wave length λ with central wavelength2Light and at the 3C of port input central wavelength be third wavelength X3On pass through
Allusion quotation signal light carries out multiplex, and the light of these three wavelength multiplex at the 3A of port is made to export and be transmitted to the second light through the first channel 4
Learn device 5.
At the second optical device 5, the second optical device 5 can include that central wavelength is distinguished by what is inputted at the 5A of port
For first wave length λ1, second wave length λ2With third wavelength X3Light multiplex carry out partial wave so that central wavelength be λ3On pass through
Allusion quotation signal light is exported at the 5C of port to the conjunction Shu Duan of 1:N optical splitter, and at its beam splitting end, output is divided all the way after 1:N optical splitter
The road Bing Jianggai is divided the port 7C for being transmitted to third optical device 7；Central wavelength is made to be respectively first wave length λ simultaneously1With
Two wavelength Xs2Quantum signal light exported at the 5B of port, and be transmitted to the port 7B of third optical device 7.
At third optical device 7, the central wavelength inputted at the 7B of port is first wave length λ by third optical device 71
It is second wave length λ with central wavelength2Quantum signal light with the 7C of port at input central wavelength be third wavelength X3Uplink
Classical signals light carries out multiplex, and the light of these three wavelength multiplex at the 7A of port is made to export and be transmitted to the 4th through second channel 8
Optical device 9.In this way, central wavelength is first wave length λ1With second wave length λ2Quantum signal light can avoid 1:N optical splitter,
To avoid the splitting loss as caused by optical splitter.
At the 4th optical device 9, the 4th optical device 9 include central wavelength is respectively the by what is inputted at the 9A of port
One wavelength X1, second wave length λ2With third wavelength X3Signal light multiplex carry out partial wave so that central wavelength is respectively first wave
Long λ1With second wave length λ2Quantum signal light export and be transmitted to QKD recipient 10 at the 9B of port, QKD recipient is by quantum
Signal light is measured with detector, completes quantum communications；Meanwhile by central wavelength be third wavelength X3Uplink classical signals
Light exports at the 9C of port and is transmitted to the optical line terminal OLT 2 of PON, to complete uplink classical communication.
The 2 dispatching centre wavelength of optical line terminal OLT of PON is λ4Downlink classical signals light, and be transmitted to the 4th optics
The port 9C of device 9.The central wavelength inputted in port 9C is the 4th wavelength X by the 4th optical device 94Downlink classical signals
Photosynthetic wave exports it in port 9A and is transmitted to the port 7A of third optical device 7 through second channel 8.In third optics device
At part 7, central wavelength is the 4th wavelength X by third optical device 74Downlink classical signals light carry out partial wave, make it in port
7C is exported and is transmitted to the conjunction Shu Duan of 1:N optical splitter 6.Central wavelength is the 4th wavelength X4Downlink classical signals light through optical splitter
A 6 beam splitting end exports and is transmitted to the port 5C of the second optical device 5,5 centering cardiac wave a length of 4th of the second optical device
Wavelength X4The photosynthetic wave of downlink classical signals, export it at the 5A of port and be transmitted to the first optical device 3 through the first channel 4
Port 3A.First optical device 3 can be the 4th wavelength X to the central wavelength inputted at the 3A of port4Downlink classics letter
Number light carries out partial wave, exports it to be transmitted to the optical network unit ONU 11 of PON the 3C of port at, so that it is classical to complete downlink
Communication.
In the above scheme of the embodiment of the present invention, progress partial wave and multiplex when quantum signal light passes through optical splitting point, and around
Optical splitter is crossed, the splitting loss of optical splitter introducing is avoided, solves the problems, such as that splitting ratio restricts transmission range.Meanwhile it improving
The signal-to-noise ratio of QKD (quantum key distribution), thus improve QKD at code rate and other performance indicators.Utilize WDM (wavelength-division
Multiplexing) technology, transmit quantum signal on original optical fiber for carrying classical channel, saved fiber resource, be quantum communications into
The realization large-scale engineering of one step and functionization are laid a good foundation.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Within the technical scope of the present disclosure, any changes or substitutions that can be easily thought of by anyone skilled in the art,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (8)
1. a kind of method of quantum key distribution and passive optical access network fusion characterized by comprising
Quantum key distribution QKD sender's quantum signal light, the optical network unit ONU of passive optical access network PON are sent
The optical line terminal OLT of allusion quotation of passing through signal light, PON sends downlink classical signals light；
Quantum signal light is transmitted to the second optical device after merging with downlink classical signals light through the first optical device, by the second light
Device is learned by quantum signal light and downlink classical signals light partial wave, the downlink classical signals light after partial wave is after 1:N optical splitter
It is input to third optical device, the quantum signal light after partial wave directly inputs third optical device；It will be divided by third optical device
Downlink classical signals light after light is transmitted to the 4th optical device after merging with quantum signal light；By the 4th optical device by quantum
Signal light and downlink classical signals light partial wave；Quantum signal light after partial wave is input to QKD recipient, is utilized by QKD recipient
Detector measures the quantum signal light of input, completes quantum communications；Downlink classical signals light after partial wave is input to
ONU completes downlink classical communication；
Uplink classical signals light passes sequentially through the 4th optical device, third optical device, optical splitter, the second optical device and first
It is input to OLT after optical device, completes uplink classical communication.
2. the method according to claim 1, wherein
First optical device, the second optical device, third optical device and the 4th optics device are wavelength division multiplexer.
3. a kind of method of quantum key distribution and passive optical access network fusion characterized by comprising
Quantum key distribution QKD sender's quantum signal light, the optical network unit ONU of passive optical access network PON are sent
The optical line terminal OLT of allusion quotation of passing through signal light, PON sends downlink classical signals light；
Quantum signal light is transmitted to the second optical device after merging with uplink classical signals light through the first optical device, by the second light
Device is learned by quantum signal light and uplink classical signals light partial wave, the uplink classical signals light after partial wave is after 1:N optical splitter
It is input to third optical device, the quantum signal light after partial wave directly inputs third optical device；It will be divided by third optical device
Uplink classical signals light after light is transmitted to the 4th optical device after merging with quantum signal light；By the 4th optical device by quantum
Signal light and uplink classical signals light partial wave；Quantum signal light after partial wave is input to QKD recipient, is utilized by QKD recipient
Detector measures the quantum signal light of input, completes quantum communications；Uplink classical signals light after partial wave is input to
OLT completes uplink classical communication；
Downlink classical signals light passes sequentially through the 4th optical device, third optical device, optical splitter, the second optical device and first
It is input to ONU after optical device, completes downlink classical communication.
4. according to the method described in claim 3, it is characterized in that,
First optical device, the second optical device, third optical device and the 4th optics device are wavelength division multiplexer.
5. the device of a kind of quantum key distribution and passive optical access network fusion, which is characterized in that for realizing claim 1 or
Method described in 2, the device include:
Quantum key distribution QKD sender, the optical line terminal OLT of passive optical access network PON, the first optical device, the first letter
Road, the second optical device, 1:N optical splitter, third optical device, second channel, the 4th optical device, QKD recipient, PON
Optical network unit ONU；Wherein:
QKD sender is connected with the port 3B of the first optical device, and OLT is connected with the port 3C of the first optical device, the first light
The port 3A for learning device is connected by the first channel with the port 5A of the second optical device；
The port 5C of second optical device is connected with the conjunction beam end of 1:N optical splitter, the beam splitting end of 1:N optical splitter and third optics device
The port 7C of part is connected, and the port 5B of the second optical device is connected with the port 7B of third optical device；Third optical device
Port 7A is connected by second channel with the port 9A of the 4th optical device, the port 9B and QKD recipient of the 4th optical device
It is connected, the port 9C of the 4th optical device is connected with ONU.
6. device according to claim 5, which is characterized in that
First optical device, the second optical device, third optical device and the 4th optics device are wavelength division multiplexer.
7. the device of a kind of quantum key distribution and passive optical access network fusion, which is characterized in that for realizing claim 3 or
Method described in 4, the device include:
Quantum key distribution QKD sender, the optical line terminal OLT of passive optical access network PON, the first optical device, the first letter
Road, the second optical device, 1:N optical splitter, third optical device, second channel, the 4th optical device, QKD recipient, PON
Optical network unit ONU；Wherein:
QKD sender is connected with the port 3B of the first optical device, and ONU is connected with the port 3C of the first optical device, the first light
The port 3A for learning device is connected by the first channel with the port 5A of the second optical device；
The port 5C of second optical device is connected with the beam splitting end of 1:N optical splitter, the conjunction Shu Duanyu third optics device of 1:N optical splitter
The port 7C of part is connected, and the port 5B of the second optical device is connected with the port 7B of third optical device；Third optical device
Port 7A is connected by second channel with the port 9A of the 4th optical device, the port 9B and QKD recipient of the 4th optical device
It is connected, the port 9C of the 4th optical device is connected with OLT.
8. device according to claim 7, which is characterized in that
First optical device, the second optical device, third optical device and the 4th optics device are wavelength division multiplexer.
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| CN109217938B (en) * | 2017-06-29 | 2020-04-03 | 国科量子通信网络有限公司 | Efficient quantum communication network |
| CN108337088B (en) * | 2018-02-08 | 2021-01-22 | 中国人民解放军战略支援部队信息工程大学 | Single-fiber fusion quantum key distribution system and method and related system and method |
| CN108512623B (en) * | 2018-02-11 | 2020-01-07 | 安徽问天量子科技股份有限公司 | Quantum channel and classical channel composite fiber QKD system and transmission method thereof |
| CN108667526B (en) * | 2018-03-14 | 2020-06-19 | 北京邮电大学 | Multi-service safe transmission method, device and equipment in optical transport network |
| CN110324105B (en) * | 2018-03-30 | 2023-11-28 | 上海国盾量子信息技术有限公司 | Quantum key distribution system and PON equipment common fiber transmission method and system |
| CN109600221B (en) * | 2018-12-31 | 2021-06-29 | 广东尤科泊得科技发展有限公司 | QTTH system based on multi-core optical fiber mode division multiplexing and transmission method |
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