CN205883270U - Duplex quantum key distribution system - Google Patents
Duplex quantum key distribution system Download PDFInfo
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- CN205883270U CN205883270U CN201620870859.2U CN201620870859U CN205883270U CN 205883270 U CN205883270 U CN 205883270U CN 201620870859 U CN201620870859 U CN 201620870859U CN 205883270 U CN205883270 U CN 205883270U
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Abstract
The utility model discloses a duplex quantum key distribution system, including two mating QKD devices, every QKD device contains a transmitting terminal and a receiving terminal, two mating QKD devices use all the way synchronous light, wherein the synchronous light yield that produces of the transmitting terminal of first platform QKD device gives the receiving terminal of second platform QKD device, and the synchronous light sent simultaneously that the transmitting terminal of first platform QKD device produced to the receiving terminal of first platform QKD device, the receiving terminal received synchronization signal of second platform QKD device sends the transmitting terminal of second platform QKD device to. The utility model discloses it has following advantage to compare prior art: through the connection constitution light path between the optical device commonly used, realize carrying out duplexing QKD, simple accurate with synchronous light of the same kind, the problem of the synchronous light reflex of current duplexing QKD system leads to the QKD system full duplex to move is solved to need not increase the channel of another one wavelength.
Description
Technical field
This utility model relates to field of quantum secure communication, in particular, provides a kind of duplex quantum key distribution system.
Background technology
Duplex quantum key distribution (Quantum Key Distribution, QKD) system, in the most each QKD system all
Comprising an a sender Alice and recipient Bob, a pair equipment can run two QKD links simultaneously, and signal is such as Fig. 1
Shown in.
It is same that a key technology in QKD system is exactly the information of system sender (Alice) and system recipient (Bob)
Step.On photon pulse that the photon pulse that only recipient detects sends with sender is Tong Bu, system both sides just can extract
The quantum key that safety is consistent.
In prior art, each of the links of duplex system uses synchronizable optical alone to synchronize.Consider that scale should
With, the design of every QKD device is consistent, and i.e. two equipment of pairing work are identical.So, in both links
The parameters (wavelength, frequency etc.) of synchronizable optical be also identical, and transmit in same optical fiber.Due to actual fiber
Chain environment is undesirable, there is fiber end face reflex.Such as, after QKD link 1 starts, the Alice of this link sends
Synchronizable optical there may be reflex, and its reflection light enters the Bob of link 2, thus the synchronizing signal in link 2 can be caused to discriminate by mistake
Not；So after link 2 starts, the synchronizable optical that the Alice of link 2 sends can be interfered, and causes this link normally not transport
OK.
As in figure 2 it is shown, the patent " synchronization of a kind of quantum key distribution system of existing Application No. 201410472681.1
Method and device " in order to solve the problem of synchronizable optical reflection, take duplex QKD equipment configures the different synchronization of two wavelength
Light laser, when duplex QKD runs, both links uses the synchronizable optical of a kind of wavelength therein respectively.
In the middle of this area, being defined as " two-way QKD system ", this refers in the implementation of QKD, and flashlight is from
One QKD end is sent to the 2nd QKD end, returns a QKD end with tailing edge original optical path.In general, is issued from a QKD end
The flashlight of two QKD ends is relatively strong, hundreds of or thousand of photon of average each pulse, and before returning to a QKD end, the
Two QKD ends are attenuated to single photon magnitude (average one photon of each pulse or less).On the optical fiber link of system only
Article one, QKD link, is two-way (two-way), a process for either simplex.
" there is the two-way QKD system of back scattering suppression " (Application No. of documents such as MAGIQ Technologies Inc.
200580025415.3), its first QKD station has lasing light emitter luminous at different wavelengths, and multiple single-photon detector
(SPD) unit.In two-way QKD system, rear orientation light is typically being connected the first and second QKD by stronger output signal light
The optical fiber link stood produces.Return the signal of the first QKD station from the second QKD station in order to rear orientation light interference is reduced or avoided
The detection of light, this patent in Sequential Activation the first QKD station when of each couple of SPD in SPD unit, the light that Sequential Activation is different
Source.This patent is to be solved is the problem that in two-way QKD system, the detection of flashlight is easily disturbed by rear orientation light, and it is right
The requirement of related Control System is higher, needs according to the length of actual fiber link, the Expected Arrival Time of signal calculated light,
Expected Arrival Time carries out different light source, the activation of SPD unit controls, and control accuracy requires height, and this Sequential Activation
Process is persistently carried out.
" duplex QKD system " in this motion is different from above-mentioned " two-way QKD system ".According to above-mentioned definition, " two-way QKD
System " it is " two-way (two-way), either simplex ", " duplex QKD system " is then " unidirectional (one-way), duplex ", for can be " the most double
Work " system that works, every one end of duplex system all contains Alice and Bob, can set up two QKD links simultaneously.
In prior art, each of the links of duplex system uses synchronizable optical alone to synchronize, and this can cause synchronizing
The appearance of luminous reflectance problem.It addition, an existing technical scheme, although this problem can be solved, but both links still uses
The scheme of synchronizable optical, and the program alone is bigger to system development cost increase.
Utility model content
Technical problem to be solved in the utility model there are provided a kind of scheme that can solve synchronizable optical reflection problems,
Make the duplexing quantum key distribution system that two QKD links all can be properly functioning.
This utility model is to solve above-mentioned technical problem by the following technical programs: a kind of duplex quantum key distribution system
System, two QKD devices of pairing use a road synchronizable optical, the synchronizable optical output that wherein transmitting terminal of First QKD device produces
To the receiving terminal of second QKD device, and the synchronizable optical that the transmitting terminal of First QKD device produces is simultaneously sent to First
The receiving terminal of QKD device, the synchronizing signal that the receiving terminal of second QKD device receives sends sending out of second QKD device to
Sending end.
As the first concrete technical scheme, two QKD apparatus structures of pairing are identical, the synchronization of every QKD device
Light produces and receives device and includes crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument, beam splitter, adjustable optical attenuator, annular
Device, photoswitch, PIN pipe, receiving terminal phaselocked loop；
Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, synchronizes
The outfan of light laser is connected to the input of beam splitter, and the light splitting ratio of beam splitter is N:1, and beam splitter ratio is
One end of N connects circulator port 1 by adjustable optical attenuator, and circulator port 2 is the input/output end port of synchronizable optical, light
Beam splitter ratio be 1 one end connect the port 1 of photoswitch, circulator port 3 connects the port 2 of photoswitch, photoswitch defeated
Going out end and connect receiving terminal phaselocked loop by PIN pipe, receiving terminal phaselocked loop is connected with transmitting terminal phaselocked loop.
In this embodiment, its synchronous method is as follows:
The transmitting terminal of First QKD device and the receiving terminal of second QKD device are paired into QKD link 1, second QKD
The transmitting terminal of device and the receiving terminal of First QKD device are paired into QKD link 2；
Send the link of synchronizable optical, synchronizable optical route: first the signal of local crystal oscillator output is accessed First QKD device
The phaselocked loop of middle transmitting terminal, after phaselocked loop, produces synchronizable optical and drives signal, the synchronizable optical of phaselocked loop output to drive signal,
Acting on synchronizable optical laser instrument, the synchronizable optical of synchronizable optical laser instrument output is one end of N through beam splitter ratio, then through can
Optical attenuator, enters circulator port 1, exports from circulator port 2, through fiber-optic transfer, arrive in second QKD device
The port 2 of circulator, exports from the port 3 of circulator, enters the port 2 of photoswitch, then manages through PIN, is converted into the signal of telecommunication
After give the phaselocked loop of receiving terminal, complete transmitting terminal and the reception of second QKD device of the First QKD device of QKD link 1
The synchronization of end；
The synchronizable optical route of another link: in second QKD device, the phaselocked loop of transmitting terminal is with in this second QKD device
The phaselocked loop output of receiving terminal is as driving signal so that the synchronizing signal that the phaselocked loop of transmitting terminal is inputted can be with receiving terminal
The synchronizing signal homology that exported of phaselocked loop, the transmitting terminal of this second QKD device the most additionally produces synchronizable optical, First
The outfan that beam splitter ratio is 1 of QKD device, connects the port 1 of photoswitch, and the synchronizable optical signal of photoswitch output enters
PIN pipe carries out opto-electronic conversion, obtains synchronizing the signal of telecommunication and gives the phaselocked loop of receiving terminal, completes second QKD dress of QKD link 2
The transmitting terminal put and the synchronization of the receiving terminal of First QKD device.
As concrete the second technical scheme, two QKD apparatus structures of pairing are different, the First QKD dress of pairing
The synchronizable optical generator put includes crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument, beam splitter, adjustable optical attenuator, ring
Shape device, photoswitch, PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to transmitting terminal phaselocked loop, the output of transmitting terminal phaselocked loop
End connect synchronizable optical laser instrument, synchronizable optical laser instrument produce synchronizable optical enter beam splitter, beam splitter by synchronizable optical according to N:1
Light splitting ratio light splitting, the synchronizable optical of synchronizable optical laser instrument output is one end of N through beam splitter ratio, then through tunable optical
Attenuator enters circulator port 1, and circulator port 2 is the output port of synchronizable optical, the synchronizable optical of synchronizable optical laser instrument output
Connect the port 1 of photoswitch through one end that beam splitter ratio is 1, the outfan of photoswitch connects receiving terminal by PIN pipe
Phaselocked loop；
The synchronization optical pickup apparatus of second QKD device of pairing includes that crystal oscillator, transmitting terminal phaselocked loop, circulator, light are opened
Close, PIN manages, receiving terminal phaselocked loop, and wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and circulator port 2 is the input of synchronizable optical
Mouthful, circulator port 3 connects the port 2 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe, receives
End phaselocked loop is connected with transmitting terminal phaselocked loop.
In this embodiment, its synchronous method is as follows:
The transmitting terminal of First QKD device and the receiving terminal of second QKD device are paired into QKD link 1, second QKD
The transmitting terminal of device and the receiving terminal of First QKD device are paired into QKD link 2；
Send the link of synchronizable optical, synchronizable optical route: first the signal of local crystal oscillator output is accessed First QKD device
The phaselocked loop of middle transmitting terminal, after phaselocked loop, produces synchronizable optical and drives signal, the synchronizable optical of phaselocked loop output to drive signal,
Acting on synchronizable optical laser instrument, the synchronizable optical of synchronizable optical laser instrument output is one end of N through beam splitter ratio, then through can
Optical attenuator, enters circulator port 1, exports from circulator port 2, through fiber-optic transfer, arrive in second QKD device
The port 2 of circulator, exports from the port 3 of circulator, enters the port 2 of photoswitch, then manages through PIN, is converted into the signal of telecommunication
After give the phaselocked loop of receiving terminal, complete transmitting terminal and the reception of second QKD device of the First QKD device of QKD link 1
The synchronization of end；
The synchronizable optical route of another link: in second QKD device, the phaselocked loop of transmitting terminal is with in this second QKD device
The phaselocked loop output of receiving terminal is as driving signal so that the synchronizing signal that transmitting terminal phaselocked loop is inputted can be with receiving terminal
The synchronizing signal homology that phaselocked loop is exported, but the transmitting terminal of this second QKD device the most additionally produces synchronizable optical, First
The outfan that beam splitter ratio is 1 of QKD device, connects the port 1 of photoswitch, and the synchronizable optical signal of photoswitch output enters
PIN pipe carries out opto-electronic conversion, obtains synchronizing the signal of telecommunication and gives the phaselocked loop of receiving terminal, thus completes second of QKD link 2
The transmitting terminal of QKD device and the synchronization of the receiving terminal of First QKD device.
As the third concrete technical scheme, two QKD apparatus structures of pairing are different, and First QKD device has been
Whole QKD device, second QKD device is that the simplest synchronizable optical receives QKD device；
The synchronizable optical of complete QKD device produce and receive device include crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument,
Beam splitter, adjustable optical attenuator, circulator, photoswitch, PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to transmitting terminal lock
Xiang Huan, the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, and the outfan of synchronizable optical laser instrument is connected to beam splitter
Input, the light splitting ratio of beam splitter is N:1, and beam splitter ratio is that one end of N connects ring by adjustable optical attenuator
Shape device port 1, circulator port 2 is the input/output end port of synchronizable optical, and beam splitter ratio is one end connection photoswitch of 1
Port 1, circulator port 3 connects the port 2 of photoswitch, the outfan of photoswitch by PIN pipe connect receiving terminal phaselocked loop,
Receiving terminal phaselocked loop is connected with transmitting terminal phaselocked loop；
The simplest synchronizable optical receives the synchronization optical pickup apparatus of QKD device and includes crystal oscillator, transmitting terminal phaselocked loop, circulator, light
Switch, PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and circulator port 2 is the input of synchronizable optical
Port, circulator port 3 connects the port 2 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe, connects
Receiving end phaselocked loop is connected with transmitting terminal phaselocked loop.
In this technical scheme, the transmitting terminal of complete QKD device and the simplest synchronizable optical receive the receiving terminal of QKD device and are paired into
QKD link 1, the receiving terminal of transmitting terminal and complete QKD device that the simplest synchronizable optical receives QKD device is paired into QKD link 2；
Send the link of synchronizable optical, synchronizable optical route: first accessed in complete QKD device by the signal of local crystal oscillator output
The phaselocked loop of transmitting terminal, after phaselocked loop, produces synchronizable optical and drives signal, the synchronizable optical of phaselocked loop output to drive signal, make
For synchronizable optical laser instrument, the synchronizable optical of synchronizable optical laser instrument output is one end of N through beam splitter ratio, then through adjustable
Optical attenuator, enters circulator port 1, exports from circulator port 2, through fiber-optic transfer, arrives the simplest synchronizable optical and receives QKD
The port 2 of circulator in device, exports from the port 3 of circulator, enters the port 2 of photoswitch, then manages through PIN, is converted into
Giving the phaselocked loop of receiving terminal after the signal of telecommunication, the transmitting terminal and the simplest synchronizable optical that complete the complete QKD device of QKD link 1 receive
The synchronization of the receiving terminal of QKD device；
The synchronizable optical route of another link: it is the simplest same with this that the simplest synchronizable optical receives the phaselocked loop of transmitting terminal in QKD device
The phaselocked loop output of step light-receiving QKD device receiving terminal is as driving signal so that the synchronization that the phaselocked loop of transmitting terminal is inputted
The synchronizing signal homology that signal can be exported with the phaselocked loop of receiving terminal, but this simplest synchronizable optical receives sending out of QKD device
Sending end the most additionally produces synchronizable optical, and the beam splitter B S ratio example of complete QKD device is the outfan of 1, connects the port of photoswitch
1, the synchronizable optical signal of photoswitch output enters PIN pipe and carries out opto-electronic conversion, obtains synchronizing the signal of telecommunication and gives the phase-locked of receiving terminal
Ring, the simplest synchronizable optical completing QKD link 2 receives the transmitting terminal of QKD device and the synchronization of the receiving terminal of complete QKD device.
As the 4th kind of concrete technical scheme, the First QKD device of pairing uses the simplest synchronizable optical to send QKD dress
Putting, second QKD device uses complete QKD device；
The simplest synchronizable optical sends the synchronizable optical generator of QKD device and includes crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser
Device, beam splitter, adjustable optical attenuator, circulator, photoswitch, PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to send
End phaselocked loop, the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, and synchronizable optical laser instrument produces synchronizable optical entrance light and divides
Bundle device, beam splitter is by synchronizable optical according to the light splitting ratio light splitting of N:1, and the synchronizable optical of synchronizable optical laser instrument output is through light beam splitting
Device ratio is one end of N, then enters circulator port 1 through adjustable optical attenuator, and circulator port 2 is the outfan of synchronizable optical
Mouthful, the synchronizable optical of synchronizable optical laser instrument output connects the port 1 of photoswitch, photoswitch through one end that beam splitter ratio is 1
Outfan by PIN pipe connect receiving terminal phaselocked loop；
The synchronizable optical of complete QKD device produce and receive device include crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument,
Beam splitter, adjustable optical attenuator, circulator, photoswitch, PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to transmitting terminal lock
Xiang Huan, the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, and the outfan of synchronizable optical laser instrument is connected to beam splitter
Input, the light splitting ratio of beam splitter is N:1, and beam splitter ratio is that one end of N connects ring by adjustable optical attenuator
Shape device port 1, circulator port 2 is the input/output end port of synchronizable optical, and beam splitter ratio is one end connection photoswitch of 1
Port 1, circulator port 3 connects the port 2 of photoswitch, the outfan of photoswitch by PIN pipe connect receiving terminal phaselocked loop,
Receiving terminal phaselocked loop is connected with transmitting terminal phaselocked loop.
In this technical scheme, the receiving terminal of transmitting terminal and complete QKD device that the simplest synchronizable optical sends QKD device is paired into
QKD link 1, the transmitting terminal of complete QKD device and the simplest synchronizable optical send the receiving terminal of QKD device and are paired into QKD link 2；
Send the link of synchronizable optical, synchronizable optical route: first the signal of local crystal oscillator output is accessed the simplest synchronizable optical and send out
Send the phaselocked loop of transmitting terminal in QKD device, after phaselocked loop, produce synchronizable optical and drive signal, the synchronizable optical of phaselocked loop output
Driving signal, act on synchronizable optical laser instrument, the synchronizable optical of synchronizable optical laser instrument output is the one of N through beam splitter ratio
End, then through adjustable optical attenuator, enter circulator port 1, export from circulator port 2, through fiber-optic transfer, arrive complete
The port 2 of circulator in QKD device, exports from the port 3 of circulator, enters the port 2 of photoswitch, then manages through PIN, conversion
Become the phaselocked loop giving receiving terminal after the signal of telecommunication, complete the simplest synchronizable optical of QKD link 1 and send the transmitting terminal of QKD device and complete
The synchronization of the receiving terminal of whole QKD device；
The synchronizable optical route of another link: in complete QKD device, the phaselocked loop of transmitting terminal is with this complete QKD device receiving terminal
Phaselocked loop output as driving signal so that the synchronizing signal that the phaselocked loop of transmitting terminal is inputted can phase-locked with receiving terminal
The synchronizing signal homology that ring is exported, but the transmitting terminal of this complete QKD device the most additionally produces synchronizable optical, and the simplest synchronizable optical is sent out
The beam splitter B S ratio example sending QKD device is the outfan of 1, connects the port 1 of photoswitch, the synchronizable optical signal of photoswitch output
Enter PIN pipe and carry out opto-electronic conversion, obtain synchronizing the signal of telecommunication and give the phaselocked loop of receiving terminal, complete the complete QKD of QKD link 2
The transmitting terminal of device and the simplest synchronizable optical send the synchronization of the receiving terminal of QKD device.
In any of the above-described kind of technical scheme, two QKD devices of pairing work receive top level control system and control, and control system
System is connected respectively to two QKD devices of pairing work, configures and is sent synchronizable optical by the transmitting terminal of which platform QKD device, then simultaneously
Photoswitch in the QKD device of this transmission synchronizable optical is set to port 1 gate, photoswitch in the most other QKD device
It is set to port 2 gate.
This utility model has the advantage that compared to existing technology
1. the application is by connecting and composing light path between conventional optics, it is achieved carry out duplex by a road synchronizable optical
QKD, has simple and easy to do feature.
2. build light path by devices such as beam splitter member, optical circulator and photoswitches to connect, it is achieved by a road synchronizable optical
Carrying out duplex QKD, can solve that each of the links of existing duplex QKD system uses that synchronizable optical alone carries out synchronizing bringing is same
Step luminous reflectance, causes the QKD system can not the problem of full duplex operation.
3. build light path by devices such as beam splitter member, optical circulator and photoswitches to connect, it is achieved by a road synchronizable optical
Carry out duplex QKD, the scheme of the synchronizable optical laser instrument different relative to two wavelength of configuration in prior art, system development cost
Less, and need not increase the channel of another one wavelength.
4. without changing laser instrument, detector and the electronics board in original duplex QKD system, passive by using
Optical device carries out upgrading to light path, can realize carrying out duplex QKD by a road synchronizable optical.
Accompanying drawing explanation
Fig. 1 is duplex QKD system schematic diagram；
Fig. 2 is the synchronization scenario figure of prior art；
Fig. 3 is the separate unit QKD device conceptual scheme of this utility model embodiment one；
Fig. 4 is that two QKD links of this utility model embodiment one use a road synchronizable optical to carry out the conceptual scheme synchronized；
Fig. 5 is that the duplexing QKD system of this utility model embodiment one receives control system control schematic diagram；
Fig. 6 is the conceptual scheme of the duplexing QKD system-L of this utility model embodiment two；
Fig. 7 is the conceptual scheme of the duplexing QKD system-R of this utility model embodiment two；
Fig. 8 is that the duplexing QKD system of this utility model embodiment two receives control system control schematic diagram.
Detailed description of the invention
Elaborating embodiment of the present utility model below, the present embodiment is being front with technical solutions of the utility model
Put and implement, give detailed embodiment and concrete operating process, but protection domain of the present utility model does not limits
In following embodiment.
This utility model provides a kind of duplex quantum key distribution system, and two QKD devices of pairing use a road to synchronize
Light, every QKD device comprises an a transmitting terminal Alice and receiving terminal Bob.Wherein the transmitting terminal of First QKD device produces
Raw synchronizable optical exports to the receiving terminal of second QKD device, and the synchronizable optical that the transmitting terminal of First QKD device produces is simultaneously
Being sent to the receiving terminal of First QKD device, the synchronizing signal that the receiving terminal of second QKD device receives sends second to
The transmitting terminal of QKD device.
Embodiment one
As it is shown on figure 3, in the present embodiment, in this duplex QKD system, two QKD apparatus structures of pairing are identical, every
The synchronizable optical of QKD device produces and receives device and includes crystal oscillator (Oscillator, OSC), transmitting terminal phaselocked loop (Phase
Locked Loop, PLL), synchronizable optical laser instrument (LD, Laser Diode), beam splitter BS (Beam Splitter), adjustable
Optical attenuator, circulator, photoswitch OSW (Optical Switch), PIN pipe, receiving terminal phaselocked loop.
Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, synchronizes
The outfan of light laser is connected to the input of beam splitter, and the light splitting ratio of beam splitter is N:1, and beam splitter ratio is
One end of N connects circulator port 1 by adjustable optical attenuator, and circulator port 2 is the input/output end port of synchronizable optical, light
Beam splitter ratio be 1 one end connect the port 1 of photoswitch, circulator port 3 connects the port 2 of photoswitch, photoswitch defeated
Go out end and connect receiving terminal phaselocked loop by PIN pipe.Receiving terminal phaselocked loop is connected with transmitting terminal phaselocked loop.
QKD system is that the clock produced with crystal oscillator drives.Phaselocked loop utilizes the clock reference signal control of outside input
The frequency of loop internal oscillation signal processed and phase place, it is possible to achieve output signal frequency to frequency input signal from motion tracking,
The clock signal output of different frequency i.e. can be produced according to the clock signal of input frequency.
In the technical program, first the signal of local crystal oscillator output is accessed phaselocked loop, after phaselocked loop, produce signal
Optical drive signal and synchronizable optical drive signal.Flashlight drives signal and synchronizable optical to drive the frequency of signal to differ, and many
In the case of number, flashlight drives the frequency frequency more than synchronizable optical signal of signal.
Flashlight drives signal and synchronizable optical to drive signal to be respectively acting on flashlight laser instrument and synchronizable optical laser instrument, with
Flashlight needed for generation system and synchronizable optical.Flashlight is used for producing quantum key, and synchronizable optical is used for realizing system transmitting terminal
Synchronization with receiving terminal.This utility model is mainly the method for synchronization of system, so being concerned only with the subsequent treatment of synchronizable optical, and closes
Repeat no more in flashlight.
The light splitting ratio of beam splitter is N:1, and wherein N is positive integer, and such as, using light splitting ratio is the BS of 9:1, when
So, light splitting ratio can be with unrestricted choice according to practical situation.Wherein, ratio is that the outfan of N connects an adjustable optical attenuator,
Access circulator port 1 again, export from circulator port 2, circulator port 2 be duplex QKD system external light input/defeated
Go out (I/O) port.
The synchronizable optical of synchronizable optical laser instrument output accesses the input of photoswitch through the outfan that beam splitter ratio is 1
Mouth 1.Wherein photoswitch specification is 1*2 matrix type, and the output of circulator port 3 accesses another input port 2 of photoswitch.
What photoswitch exported is the synchronizable optical being intended to be sent to this duplex QKD system receiving terminal, needs to carry out through PIN pipe
Photoelectric conversion, obtains the signal of telecommunication, is then passed to the phaselocked loop of receiving terminal, and this phaselocked loop, according to the synchronization signal of telecommunication of this input, produces
The raw detecting clock for single-photon detector.
Refer to shown in Fig. 4, two QKD devices of pairing, come with duplex QKD system-L and duplex QKD system-R respectively
Represent.The receiving terminal Bob of the transmitting terminal Alice and duplex QKD system-R of duplex QKD system-L is paired into QKD link 1；Duplex
The receiving terminal Bob of the transmitting terminal Alice of QKD system-R and duplex QKD system-L is paired into QKD link 2.
The concrete synchronous method of duplex QKD system-L and duplex QKD system-R is as follows:
The transmitting terminal Alice of duplex QKD system-L sends synchronizable optical, and synchronizable optical is transmitted as shown in solid-line paths in Fig. 4, separately
An outer link (Alice of duplex QKD system-R does not send synchronizable optical) synchronizable optical is transmitted as shown in dashed path in Fig. 4.Its
In in this embodiment, have part connection line not use during system real work, then this untapped part does not has in the diagram
Draw.
Send the link of synchronizable optical, synchronizable optical route such as solid-line paths: first access double by the signal of local crystal oscillator output
The phaselocked loop of transmitting terminal Alice in work QKD system-L, after phaselocked loop, produces synchronizable optical and drives signal, phaselocked loop output
Synchronizable optical drives signal, acts on synchronizable optical laser instrument, and the synchronizable optical of synchronizable optical laser instrument output is N through beam splitter ratio
One end, then through adjustable optical attenuator, enter circulator port 1, export from circulator port 2, through fiber-optic transfer, arrive
In duplex QKD system-R, the port 2 of circulator, exports from the port 3 of circulator, enters the port 2 of photoswitch, then through PIN
Pipe, gives the phaselocked loop of receiving terminal Bob, completes the transmitting terminal of the duplexing QKD system-L of QKD link 1 after being converted into the signal of telecommunication
The synchronization of the receiving terminal Bob of Alice and duplex QKD system-R.
The synchronizable optical route of another link is as shown in dashed path: the phaselocked loop of transmitting terminal Alice in duplex QKD system-R
The phaselocked loop output of receiving terminal Bob in this duplex QKD system-R is as driving signal so that the phaselocked loop of transmitting terminal Alice
The synchronizing signal homology that the synchronizing signal inputted can be exported with the phaselocked loop of receiving terminal Bob, but this duplex QKD system
The transmitting terminal Alice of system-R the most additionally produces synchronizable optical.The beam splitter B S ratio example of duplex QKD system-L is the outfan of 1, even
Connecing the port 1 of photoswitch, the synchronizable optical signal of photoswitch output enters PIN pipe and carries out opto-electronic conversion, obtains synchronizing the signal of telecommunication and send
Phaselocked loop to receiving terminal Bob.Thus complete transmitting terminal Alice and the duplex QKD system of the duplexing QKD system-R of QKD link 2
The synchronization of the receiving terminal Bob of system-L.
The effect of adjustable optical attenuator is can to arrange different values in conjunction with the decay on optical fiber link so that duplex QKD
The synchronizable optical that system-L produces reaches to meet during the duplexing QKD system-R receiving terminal Bob of this link the bar of PIN pipe opto-electronic conversion
Part.
Referring to shown in Fig. 5, in actual application, two QKD devices of pairing work can receive upper strata " control system "
Control." control system " is connected respectively to two QKD devices of pairing work, can configure sending out by which duplex QKD system
Sending end Alice sends synchronizable optical.If in configuration Fig. 5, the duplexing QKD system-L in left side sends synchronizable optical, the most simultaneously by this system
Photoswitch is set to port 1 and gates, and in another one duplex QKD system-R, photoswitch is set to port 2 and gates simultaneously.
Using mutually isostructural QKD device to match in this embodiment, composition duplex QKD system, advantage is, produces
Shi Wuxu considers the situation of two QKD devices of pairing, and any two QKD devices all can be paired into and same road can be used same
Step light carries out the duplexing QKD system synchronized.
Embodiment two
Duplex QKD system, two equipment of pairing work use the most reciprocity designs, will match work in embodiment one
Two QKD system made, often end only design participates in the part of work, does not design redundancy section.Duplex QKD system-L and duplex
QKD system-R separately designs as follows:
As shown in Figure 6, the synchronizable optical generator of one of them duplex QKD system-L of pairing includes crystal oscillator
(Oscillator, OSC), transmitting terminal phaselocked loop (Phase Locked Loop, PLL), synchronizable optical laser instrument (LD, Laser
Diode), beam splitter BS (Beam Splitter), adjustable optical attenuator, circulator, photoswitch OSW (Optical
Switch), PIN pipe, receiving terminal phaselocked loop.Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and the outfan of transmitting terminal phaselocked loop is even
Connecing synchronizable optical laser instrument, synchronizable optical laser instrument produces synchronizable optical and enters beam splitter BS, beam splitter by synchronizable optical according to N:1's
Light splitting ratio light splitting, the synchronizable optical of synchronizable optical laser instrument output is one end of N through beam splitter ratio, then through adjustable light decay
Subtracting device and enter circulator port 1, circulator port 2 is the output port of synchronizable optical, the synchronizable optical warp of synchronizable optical laser instrument output
Crossing one end that beam splitter ratio is 1 and connect the port 1 of photoswitch, the outfan of photoswitch connects receiving terminal by PIN pipe and locks
Xiang Huan.
As it is shown in fig. 7, the synchronization optical pickup apparatus of another duplex QKD system-R of pairing includes crystal oscillator
(Oscillator, OSC), transmitting terminal phaselocked loop (Phase Locked Loop, PLL), circulator, photoswitch OSW (Optical
Switch), PIN pipe, receiving terminal phaselocked loop.Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and circulator port 2 is the defeated of synchronizable optical
Inbound port, circulator port 3 connects the port 2 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe.
Receiving terminal phaselocked loop is connected with transmitting terminal phaselocked loop.
Refer to shown in Fig. 8, two QKD devices of pairing, the transmitting terminal Alice of duplex QKD system-L and duplex QKD system
The receiving terminal Bob of system-R is paired into QKD link 1；The transmitting terminal Alice of duplex QKD system-R and the reception of duplex QKD system-L
End Bob is paired into QKD link 2.
In this embodiment, the concrete synchronous method of duplex QKD system-L and duplex QKD system-R is as follows:
The transmitting terminal Alice of duplex QKD system-L sends synchronizable optical, and synchronizable optical is transmitted as shown in solid-line paths in Fig. 8, separately
An outer link (Alice of duplex QKD system-R does not send synchronizable optical) synchronizable optical is transmitted as shown in dashed path in Fig. 8.
Send the link of synchronizable optical, synchronizable optical route such as solid-line paths: first access double by the signal of local crystal oscillator output
The phaselocked loop of transmitting terminal Alice in work QKD system-L, after phaselocked loop, produces synchronizable optical and drives signal, phaselocked loop output
Synchronizable optical drives signal, acts on synchronizable optical laser instrument, and the synchronizable optical of synchronizable optical laser instrument output is N through beam splitter ratio
One end, then through adjustable optical attenuator, enter circulator port 1, export from circulator port 2, through fiber-optic transfer, arrive
In duplex QKD system-R, the port 2 of circulator, exports from the port 3 of circulator, enters the port 2 of photoswitch, then through PIN
Pipe, gives the phaselocked loop of receiving terminal Bob, completes the transmitting terminal of the duplexing QKD system-L of QKD link 1 after being converted into the signal of telecommunication
The synchronization of the receiving terminal Bob of Alice and duplex QKD system-R.
The synchronizable optical route of another link is as shown in dashed path: the phaselocked loop of transmitting terminal Alice in duplex QKD system-R
The phaselocked loop output of receiving terminal Bob in this duplex QKD system-R is as driving signal so that the phaselocked loop of transmitting terminal Alice
The synchronizing signal homology that the synchronizing signal inputted can be exported with the phaselocked loop of receiving terminal Bob, but this duplex QKD system
The transmitting terminal Alice of system-R the most additionally produces synchronizable optical.The beam splitter B S ratio example of duplex QKD system-L is the outfan of 1, even
Connecing the port 1 of photoswitch, the synchronizable optical signal of photoswitch output enters PIN pipe and carries out opto-electronic conversion, obtains synchronizing the signal of telecommunication and send
Phaselocked loop to receiving terminal Bob.Thus complete transmitting terminal Alice and the duplex QKD system of the duplexing QKD system-R of QKD link 2
The synchronization of the receiving terminal Bob of system-L.
Simultaneously refering to shown in Fig. 8, in actual application, two QKD devices of pairing work can receive upper strata and " control system
System " control." control system " is connected respectively to two QKD devices of pairing work, configures by the transmitting terminal of duplex QKD system-L
Alice sends synchronizable optical.Photoswitch in this system is set to port 1 gate, simultaneously another one duplex QKD system the most simultaneously
In system-R, photoswitch is set to port 2 and gates.
The QKD device using structure to simplify in this embodiment matches, and composition duplex QKD system, advantage is, produces
Time need not make unwanted part when synchronizing, simplify and reduce cost while production technology.
Embodiment three
For ease of describing, every QKD device of the mutually isostructural pairing in embodiment one is referred to as " complete QKD dress
Put ", the only design in embodiment two participates in the part of work, and every the QKD device not designing redundancy section is referred to as " the simplest QKD
Device ", and " the simplest QKD device " sending synchronizable optical be called " the simplest synchronizable optical send QKD device ", claims reception synchronizable optical
" the simplest QKD device " is " the simplest synchronizable optical receives QKD device ".
In embodiment two, two QKD devices of pairing all use the QKD device that structure simplifies, in actual application, difficult
Exempt to occur the situation of a wherein QKD plant failure, if scene does not has the QKD device of the simplification of same structure, can affect
Use to duplex QKD system.
In this embodiment, a complete QKD device and a synchronizable optical the simplest is used to receive QKD device and be composed of duplex
QKD system.
In this duplex QKD system, the synchronizable optical of complete QKD device produces and receives device as it is shown on figure 3, include crystal oscillator
(Oscillator, OSC), transmitting terminal phaselocked loop (Phase Locked Loop, PLL), synchronizable optical laser instrument (LD, Laser
Diode), beam splitter BS (Beam Splitter), adjustable optical attenuator, circulator, photoswitch OSW (Optical
Switch), PIN pipe, receiving terminal phaselocked loop.
Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, synchronizes
The outfan of light laser is connected to the input of beam splitter, and the light splitting ratio of beam splitter is N:1, and beam splitter ratio is
One end of N connects circulator port 1 by adjustable optical attenuator, and circulator port 2 is the input/output end port of synchronizable optical, light
Beam splitter ratio be 1 one end connect the port 1 of photoswitch, circulator port 3 connects the port 2 of photoswitch, photoswitch defeated
Go out end and connect receiving terminal phaselocked loop by PIN pipe.Receiving terminal phaselocked loop is connected with transmitting terminal phaselocked loop.
The simplest synchronizable optical receive the synchronization optical pickup apparatus of QKD device as it is shown in fig. 7, comprises crystal oscillator (Oscillator,
OSC), transmitting terminal phaselocked loop (Phase Locked Loop, PLL), circulator, photoswitch OSW (Optical Switch), PIN
Pipe, receiving terminal phaselocked loop.Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and circulator port 2 is the input port of synchronizable optical, annular
Device port 3 connects the port 2 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe.Receiving terminal phaselocked loop
It is connected with transmitting terminal phaselocked loop.
Send the link of synchronizable optical, synchronizable optical route: first accessed in complete QKD device by the signal of local crystal oscillator output
The phaselocked loop of transmitting terminal Alice, after phaselocked loop, produces synchronizable optical and drives signal, the synchronizable optical of phaselocked loop output to drive letter
Number, acting on synchronizable optical laser instrument, the synchronizable optical of synchronizable optical laser instrument output is one end of N through beam splitter ratio, then warp
Cross adjustable optical attenuator, enter circulator port 1, export from circulator port 2, through fiber-optic transfer, arrive the simplest synchronizable optical
Receive the port 2 of circulator in QKD device, export from the port 3 of circulator, enter the port 2 of photoswitch, then manage through PIN,
Give the phaselocked loop of receiving terminal Bob after being converted into the signal of telecommunication, complete QKD link 1 complete QKD device transmitting terminal Alice and
The simplest synchronizable optical receives the synchronization of the receiving terminal Bob of QKD device.
The synchronizable optical route of another link: the simplest synchronizable optical receives in QKD device the phaselocked loop of transmitting terminal Alice with this
Letter synchronizable optical receives the phaselocked loop output of QKD device receiving terminal Bob as driving signal so that the phaselocked loop of transmitting terminal Alice
The synchronizing signal homology that the synchronizing signal inputted can be exported with the phaselocked loop of receiving terminal Bob, but this simplest synchronizable optical
The transmitting terminal Alice receiving QKD device the most additionally produces synchronizable optical.The beam splitter B S ratio example of complete QKD device is the output of 1
End, connects the port 1 of photoswitch, and the synchronizable optical signal of photoswitch output enters PIN pipe and carries out opto-electronic conversion, obtains synchronizing telecommunications
Number give the phaselocked loop of receiving terminal Bob.Thus the simplest synchronizable optical completing QKD link 2 receives the transmitting terminal Alice of QKD device
Synchronization with the receiving terminal Bob of complete QKD device.
In actual application, two QKD devices of pairing work can receive upper strata " control system " and control." control system "
It is connected respectively to two QKD devices of pairing work, configures and sent synchronizable optical by the transmitting terminal Alice of complete QKD device.Then same
Time photoswitch in this system be set to port 1 gate, during the simplest synchronizable optical of another one receives QKD device simultaneously, photoswitch sets
It is set to port 2 gate.
Embodiment four
For ease of describing, every QKD device of the mutually isostructural pairing in embodiment one is referred to as " complete QKD dress
Put ", the only design in embodiment two participates in the part of work, and every the QKD device not designing redundancy section is referred to as " the simplest QKD
Device ", and " the simplest QKD device " sending synchronizable optical be called " the simplest synchronizable optical send QKD device ", claims reception synchronizable optical
" the simplest QKD device " is " the simplest synchronizable optical receives QKD device ".
In embodiment two, two QKD devices of pairing all use the QKD device that structure simplifies, in actual application, difficult
Exempt to occur the situation of a wherein QKD plant failure, if scene does not has the QKD device of the simplification of same structure, can affect
Use to duplex QKD system.
In this embodiment, use a synchronizable optical the simplest to send QKD device and a complete QKD device is composed of duplex
QKD system.
The simplest synchronizable optical send QKD device synchronizable optical generator as shown in Figure 6, including crystal oscillator (Oscillator,
OSC), transmitting terminal phaselocked loop (Phase Locked Loop, PLL), synchronizable optical laser instrument (LD, Laser Diode), light beam splitting
Device BS (Beam Splitter), adjustable optical attenuator, circulator, photoswitch OSW (Optical Switch), PIN pipe, reception
End phaselocked loop.Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, synchronizes
Light laser produces synchronizable optical and enters beam splitter BS, beam splitter by synchronizable optical according to the light splitting ratio light splitting of N:1, synchronizable optical
The synchronizable optical of laser instrument output is one end of N through beam splitter ratio, then enters circulator port through adjustable optical attenuator
1, circulator port 2 is the output port of synchronizable optical, and the synchronizable optical of synchronizable optical laser instrument output is 1 through beam splitter ratio
One end connects the port 1 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe.
In this duplex QKD system, the synchronizable optical of complete QKD device produces and receives device as it is shown on figure 3, include crystal oscillator
(Oscillator, OSC), transmitting terminal phaselocked loop (Phase Locked Loop, PLL), synchronizable optical laser instrument (LD, Laser
Diode), beam splitter BS (Beam Splitter), adjustable optical attenuator, circulator, photoswitch OSW (Optical
Switch), PIN pipe, receiving terminal phaselocked loop.
Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, synchronizes
The outfan of light laser is connected to the input of beam splitter, and the light splitting ratio of beam splitter is N:1, and beam splitter ratio is
One end of N connects circulator port 1 by adjustable optical attenuator, and circulator port 2 is the input/output end port of synchronizable optical, light
Beam splitter ratio be 1 one end connect the port 1 of photoswitch, circulator port 3 connects the port 2 of photoswitch, photoswitch defeated
Go out end and connect receiving terminal phaselocked loop by PIN pipe.Receiving terminal phaselocked loop is connected with transmitting terminal phaselocked loop.
Send the link of synchronizable optical, synchronizable optical route: first the signal of local crystal oscillator output is accessed the simplest synchronizable optical and send out
Sending the phaselocked loop of transmitting terminal Alice in QKD device, after phaselocked loop, produce synchronizable optical and drive signal, it is same that phaselocked loop exports
Step optical drive signal, acts on synchronizable optical laser instrument, and the synchronizable optical of synchronizable optical laser instrument output is N's through beam splitter ratio
One end, then through adjustable optical attenuator, enter circulator port 1, export from circulator port 2, through fiber-optic transfer, arrived
The port 2 of circulator in whole QKD device, exports from the port 3 of circulator, enters the port 2 of photoswitch, then manages through PIN, turns
Giving the phaselocked loop of receiving terminal Bob after changing the signal of telecommunication into, the simplest synchronizable optical completing QKD link 1 sends the transmitting terminal of QKD device
The synchronization of the receiving terminal Bob of Alice and complete QKD device.
The synchronizable optical route of another link: in complete QKD device, the phaselocked loop of transmitting terminal Alice is with this complete QKD device
The phaselocked loop output of receiving terminal Bob is as driving signal so that the synchronizing signal that the phaselocked loop of transmitting terminal Alice is inputted can
The synchronizing signal homology exported with the phaselocked loop of receiving terminal Bob, but the transmitting terminal Alice of this complete QKD device is the most additionally
Produce synchronizable optical.It is the outfan of 1 that the simplest synchronizable optical sends the beam splitter B S ratio example of QKD device, connects the port of photoswitch
1, the synchronizable optical signal of photoswitch output enters PIN pipe and carries out opto-electronic conversion, obtains synchronizing the signal of telecommunication and gives the lock of receiving terminal Bob
Xiang Huan.Thus complete transmitting terminal Alice and the reception of the simplest synchronizable optical transmission QKD device of the complete QKD device of QKD link 2
The synchronization of end Bob.
In actual application, two QKD devices of pairing work can receive upper strata " control system " and control." control system "
It is connected respectively to two QKD devices of pairing work, configures the transmitting terminal Alice transmission being sent QKD device by the simplest synchronizable optical
Synchronizable optical.Photoswitch in this system is set to port 1 gate, simultaneously photoswitch in another one complete QKD device the most simultaneously
It is set to port 2 gate.
The foregoing is only preferred embodiment of the present utility model, not in order to limit this utility model, all at this
Any amendment, equivalent and the improvement etc. made within the spirit of utility model and principle, should be included in this utility model
Protection domain within.
Claims (9)
1. a duplexing quantum key distribution system, including two QKD devices of pairing, every QKD device comprises a transmission
End and a receiving terminal, it is characterised in that two QKD devices of pairing use a road synchronizable optical, wherein First QKD device
The synchronizable optical that transmitting terminal produces exports to the receiving terminal of second QKD device, and the transmitting terminal of First QKD device produce same
Step light is simultaneously sent to the receiving terminal of First QKD device, the synchronizing signal transmission that the receiving terminal of second QKD device receives
Transmitting terminal to second QKD device.
Duplex quantum key distribution system the most according to claim 1, it is characterised in that two QKD device knots of pairing
Structure is identical.
Duplex quantum key distribution system the most according to claim 2, it is characterised in that the synchronizable optical of every QKD device
Produce and receive device and include crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument, beam splitter, adjustable optical attenuator, annular
Device, photoswitch, PIN pipe, receiving terminal phaselocked loop；
Wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, and synchronizable optical swashs
The outfan of light device is connected to the input of beam splitter, and the light splitting ratio of beam splitter is N:1, and beam splitter ratio is N's
One end connects circulator port 1 by adjustable optical attenuator, and circulator port 2 is the input/output end port of synchronizable optical, light beam splitting
Device ratio is the port 1 of one end connection photoswitch of 1, and circulator port 3 connects the port 2 of photoswitch, the outfan of photoswitch
Connecting receiving terminal phaselocked loop by PIN pipe, receiving terminal phaselocked loop is connected with transmitting terminal phaselocked loop.
Duplex quantum key distribution system the most according to claim 1, it is characterised in that two QKD device knots of pairing
Structure is different, the synchronizable optical generator of the First QKD device of pairing include crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument,
Beam splitter, adjustable optical attenuator, circulator, photoswitch, PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to transmitting terminal lock
Xiang Huan, the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, and synchronizable optical laser instrument produces synchronizable optical and enters beam splitter,
Beam splitter is by synchronizable optical according to the light splitting ratio light splitting of N:1, and the synchronizable optical of synchronizable optical laser instrument output is through beam splitter ratio
Example is one end of N, then enters circulator port 1 through adjustable optical attenuator, and circulator port 2 is the output port of synchronizable optical,
The synchronizable optical of synchronizable optical laser instrument output connects the port 1 of photoswitch through one end that beam splitter ratio is 1, photoswitch defeated
Go out end and connect receiving terminal phaselocked loop by PIN pipe；
The synchronization optical pickup apparatus of second QKD device of pairing include crystal oscillator, transmitting terminal phaselocked loop, circulator, photoswitch,
PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and circulator port 2 is the input port of synchronizable optical,
Circulator port 3 connects the port 2 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe, and receiving terminal is locked
Phase ring is connected with transmitting terminal phaselocked loop.
Duplex quantum key distribution system the most according to claim 1, it is characterised in that two QKD device knots of pairing
Structure is different, and First QKD device is complete QKD device, and second QKD device is that the simplest synchronizable optical receives QKD device；
The synchronizable optical of complete QKD device produces and receives device and includes that crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument, light divide
Bundle device, adjustable optical attenuator, circulator, photoswitch, PIN pipe, receiving terminal phaselocked loop, wherein to be connected to transmitting terminal phase-locked for crystal oscillator
Ring, the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, and the outfan of synchronizable optical laser instrument is connected to beam splitter
Input, the light splitting ratio of beam splitter is N:1, and beam splitter ratio is that one end of N connects annular by adjustable optical attenuator
Device port 1, circulator port 2 is the input/output end port of synchronizable optical, and beam splitter ratio is one end connection photoswitch of 1
Port 1, circulator port 3 connects the port 2 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe, connects
Receiving end phaselocked loop is connected with transmitting terminal phaselocked loop；
The simplest synchronizable optical receive QKD device synchronization optical pickup apparatus include crystal oscillator, transmitting terminal phaselocked loop, circulator, photoswitch,
PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to transmitting terminal phaselocked loop, and circulator port 2 is the input port of synchronizable optical,
Circulator port 3 connects the port 2 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe, and receiving terminal is locked
Phase ring is connected with transmitting terminal phaselocked loop.
Duplex quantum key distribution system the most according to claim 1, it is characterised in that the First QKD device of pairing
Using the simplest synchronizable optical to send QKD device, second QKD device uses complete QKD device；
The simplest synchronizable optical send QKD device synchronizable optical generator include crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument,
Beam splitter, adjustable optical attenuator, circulator, photoswitch, PIN pipe, receiving terminal phaselocked loop, wherein crystal oscillator is connected to transmitting terminal lock
Xiang Huan, the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, and synchronizable optical laser instrument produces synchronizable optical and enters beam splitter,
Beam splitter is by synchronizable optical according to the light splitting ratio light splitting of N:1, and the synchronizable optical of synchronizable optical laser instrument output is through beam splitter ratio
Example is one end of N, then enters circulator port 1 through adjustable optical attenuator, and circulator port 2 is the output port of synchronizable optical,
The synchronizable optical of synchronizable optical laser instrument output connects the port 1 of photoswitch through one end that beam splitter ratio is 1, photoswitch defeated
Go out end and connect receiving terminal phaselocked loop by PIN pipe；
The synchronizable optical of complete QKD device produces and receives device and includes that crystal oscillator, transmitting terminal phaselocked loop, synchronizable optical laser instrument, light divide
Bundle device, adjustable optical attenuator, circulator, photoswitch, PIN pipe, receiving terminal phaselocked loop, wherein to be connected to transmitting terminal phase-locked for crystal oscillator
Ring, the outfan of transmitting terminal phaselocked loop connects synchronizable optical laser instrument, and the outfan of synchronizable optical laser instrument is connected to beam splitter
Input, the light splitting ratio of beam splitter is N:1, and beam splitter ratio is that one end of N connects annular by adjustable optical attenuator
Device port 1, circulator port 2 is the input/output end port of synchronizable optical, and beam splitter ratio is one end connection photoswitch of 1
Port 1, circulator port 3 connects the port 2 of photoswitch, and the outfan of photoswitch connects receiving terminal phaselocked loop by PIN pipe, connects
Receiving end phaselocked loop is connected with transmitting terminal phaselocked loop.
7. according to the duplexing quantum key distribution system described in any one of claim 1 to 6, it is characterised in that also include controlling
System, control system is connected respectively to two QKD devices of pairing work.
8. according to the duplexing quantum key distribution system described in any one of claim 3 to 6, it is characterised in that described photoswitch
For 1*2 matrix type photoswitch.
9. according to the duplexing quantum key distribution system described in any one of claim 3 to 6, it is characterised in that described smooth beam splitting
The light splitting ratio of device is 9:1.
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| CN201620870859.2U CN205883270U (en) | 2016-08-12 | 2016-08-12 | Duplex quantum key distribution system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661614A (en) * | 2018-06-28 | 2020-01-07 | 国网电力信息通信有限公司 | Polarization feedback device for quantum key distribution system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110661614A (en) * | 2018-06-28 | 2020-01-07 | 国网电力信息通信有限公司 | Polarization feedback device for quantum key distribution system |
| CN110661614B (en) * | 2018-06-28 | 2023-01-31 | 国网电力信息通信有限公司 | Polarization feedback device for quantum key distribution system |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20170111 Effective date of abandoning: 20240202 |
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| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |