CN207460200U - A kind of quantum key dispatching system based on Waveguide interference ring - Google Patents
A kind of quantum key dispatching system based on Waveguide interference ring Download PDFInfo
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- CN207460200U CN207460200U CN201720929693.1U CN201720929693U CN207460200U CN 207460200 U CN207460200 U CN 207460200U CN 201720929693 U CN201720929693 U CN 201720929693U CN 207460200 U CN207460200 U CN 207460200U
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Abstract
The utility model discloses a kind of quantum key dispatching systems and method based on Waveguide interference ring, by increasing a polarization beam apparatus in receiving terminal, flashlight is decomposed into two vertical polarization states, the interference under respective polarization state is completed using polarization maintaining optical fibre interference ring, obtain preferable result of interference, also deviation-rectifying system has been abandoned, the lengthy and jumbled degree of system has been simplified, also reduces production cost；One phase is only adjusted by an interference ring, to there was only 10 minus six powers magnitudes of existing way using the requirement of DAC and analogue amplifier, greatly reduce the requirement of system design.In addition, the utility model uses the interference ring made by planar optical waveguide, since planar optical waveguide has polarization insensitive, so that system is without additional polarization compensation means, traditional fiber interferometer is that manually to manufacture its manufacturing process complex mostly, and the manufacture craft of waveguide is extremely ripe, can reach sub-micrometer scale, preferably improves the key of system into code check.
Description
Technical field
The utility model is related to optical transport safety communication technology field, more particularly to a kind of quantum based on Waveguide interference ring
Key dispatching system.
Background technology
With a wide range of popularization of internet, the information transmission between the mankind has reached unprecedented quantity and frequency,
On the internet, therefore, the mankind have also arrived the demand of secret communication unprecedented various privacy informations for exposure more and more
Height.The cipher mode of present internet information safety is known as " public-key cryptography " cryptosystem, and principle is to pass through encryption
Algorithm, generating the public-key cryptography propagated on network and the private key for staying in computer-internal, two keys must coordinate and make
With could realize complete encryption and decryption processes.
The encryption standard that modern the Internet uses is the RSA Algorithm being born the 1970s, i.e., using matter several greatly because
Son decomposes and is difficult to calculate the security for ensureing key.
Quantum-key distribution is that physicist Bennett in 1984 and cryptologist Brassard are proposed based on quantum force
The BB84 agreements of measuring principle are learned, quantum-key distribution can fundamentally ensure that the security of key.
Quantum key generates flashlight in transmitting terminal in the prior art, by traditional quantum channel transmission process, by
In by fiber channel birefringence the effects that, polarization state is more big changes, and influences the interference effect in optical signal later stage, can be made
The loss of integral key at present, can increase deviation-rectifying system, by deviation-rectifying system come also in receiving terminal to solve the above-mentioned problems
The polarization state of former optical signal, but deviation-rectifying system needs complicated hardware and software section composition, to entire encryption key distribution system
System brings the complexity of total system and improves production cost；In addition, optical signal passes through general single mode fiber interference ring
Long galianconism different paths after its polarization state different variations can occur and cause result of interference unobvious, so normal
It needs to ensure that the polarization state of the light by dissimilar arm is identical using additional polarization compensation technology in making, further increase
System complexity and improve production cost.
Utility model content
The utility model aim is to provide a kind of quantum key dispatching system based on Waveguide interference ring, existing to solve
Quantum key distribution system needs system to increase deviation-rectifying system and polarization compensation skill to improve key generation efficiency in technology
Art, so that system adds complexity and improves the technical bug of production cost.
What the technical solution of the utility model was realized in：
A kind of quantum key dispatching system based on Waveguide interference ring, including the transmitting terminal that is connected by quantum channel with connecing
Receiving end, the transmitting terminal include transmitting terminal driving plate, signal laser, synchronous laser, intensity modulator, 1*4 polarization-maintaining beam splitting
Device, four road Waveguide interference rings, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal multiplexer, four tunnel waveguide
Interference ring arm length difference is different, and phase difference is respectively 0, pi/2, π, 3 pi/2s, the signal laser be sequentially connected intensity modulator,
1*4 polarization-maintaining beam splitters, the 1*4 polarization-maintaining beam splitters connect four road Waveguide interference rings respectively, and the four roads Waveguide interference ring respectively connects
Intensity modulator is connected to, the four roads Waveguide interference ring connects the first adjustable attenuator by the intensity modulator each connected,
First adjustable attenuator connects transmitting terminal multiplexer, and the synchronous laser is sequentially connected the second adjustable attenuator and hair
End multiplexer is penetrated, first adjustable attenuator is connected the same end of transmitting terminal multiplexer, the hair with the second adjustable attenuator
It penetrates end driving plate and connects signal laser, intensity modulator, Waveguide interference ring, synchronous laser, the first adjustable attenuator respectively
And second adjustable attenuator；
The receiving terminal includes receiving terminal driving plate, receiving terminal multiplexer, synchroprobe, polarization beam apparatus, two-way ripple
Interference ring and single-photon detector are led, the receiving terminal multiplexer connects transmitting terminal multiplexer by quantum channel, described to connect
The other end of receiving end multiplexer connects synchroprobe and polarization beam apparatus respectively, and the polarization beam apparatus connects two respectively successively
Road Waveguide interference ring, wherein, two-way Waveguide interference ring is respectively connected with two-way single-photon detector, the receiving terminal driving plate difference
Connect synchroprobe, Waveguide interference ring and single-photon detector.
Preferably, the Waveguide interference ring includes front end coupler, long-armed Wave guide unit, galianconism Wave guide unit and rear end
Coupler, the output terminal of the front end coupler connect long-armed Wave guide unit and galianconism Wave guide unit, the long-armed ripple respectively
The output terminal for leading unit and galianconism Wave guide unit connects rear end coupler respectively, and the long-armed Wave guide unit includes the first coupling
Device, delay waveguide and the second coupler, first coupler connects the output terminal of front end coupler by silicon waveguide, described
First coupler connects the second coupler by the waveguide that is delayed, and second coupler connects rear end coupler by silicon waveguide
Input terminal, the galianconism Wave guide unit connect the input of the output terminal and rear end coupler of front end coupler using silicon waveguide
It holds, phase-modulator is provided on the long-armed Wave guide unit and/or galianconism Wave guide unit.
Preferably, the delay waveguide is the waveguide of low-loss silicon, silica waveguide, SiON waveguides, Si3N4Waveguide and poly-
One kind during object wave is led or combination are closed, adjustable attenuator is provided on the galianconism Wave guide unit.
Preferably, the signal laser and synchronous laser are same multiplexed laser, and the multiplexed laser can be adopted
Emit flashlight and synchronizable optical with time-multiplexed mode, the transmitting terminal multiplexer is adaptive multiplexer, and the receiving terminal is answered
It is solution adaptive multiplexer with device.
The utility model additionally provides a kind of quantum key distribution method based on Waveguide interference ring, comprises the following steps：
1) laser triggers：Transmitting terminal is sent out using same clock signal difference trigger signal laser and synchronous laser
Project flashlight and synchronizable optical, the flashlight as modulation light, the synchronizable optical as synchronous transmission of signal to receiving terminal by
Synchroprobe response is used in receiving terminal；
2) state modulation is inveigled：The flashlight of signal laser transmitting carries out random strength modulation by intensity modulator, adjusts
It is made for signal state, inveigles state or vacuum state；
3) transmitting terminal is interfered：Light path is divided by 4 tunnels by 1*4 polarization-maintaining beam splitters, is connected respectively to and is completed by waveguide fabrication
The different unequal arm Waveguide interference ring of 4 tunnel arm length differences, phase difference is respectively 0, pi/2, π, 3 pi/2s, and passes through 4 tunnel intensity modulateds
Device carries out break-make selection, completes the selection of transmitting terminal out of phase modulation；
4) automatically controlled adjustable attenuator decays to flashlight：Depolarizer flashlight carry out it is depolarized, it is depolarized after flashlight
Light pulse is decayed into single photon magnitude by the first adjustable attenuator, synchronizable optical passes through the second adjustable attenuator by synchronizable optical tune
Save the strength range that can be responded to receiving terminal；
5) flashlight and synchronizable optical throughput subchannel transmission：Flashlight passes through quantum with synchronizable optical after transmitting terminal is compound
Transmission decomposes again to receiving terminal, and in receiving terminal, and flashlight enters polarization beam apparatus, and synchronizable optical passes through synchronous optical detection
Device detects；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction by polarization beam apparatus and is hung down
Straight polarization direction；
7) receiving terminal is interfered：The flashlight of horizontal polarization direction and vertical polarization is respectively connected to two brachiums of two-way
The different Waveguide interference ring of difference carries out phase-modulation, and phase difference is respectively 0, pi/2, completes the selection of receiving terminal out of phase；
8) single-photon detector detects：Single-photon detector detects optical signals, and safe key is generated for subsequent processing.
Preferably, in the step 5), wavelength-division multiplex or time-division can be used transmitting terminal is compound to flashlight and synchronizable optical
The mode of multiplexing carries out, and wavelength-division multiplex or solution time division multiplexing mode progress are solved in corresponding use of receiving terminal decomposition.
Preferably, if the mode of the step 5) flashlight and synchronizable optical multiplexing of transmission is used when being time-multiplexed, the letter
Number laser can be used any one laser timesharing with synchronous laser and send flashlight and synchronizable optical.
Compared with prior art, the utility model has following advantageous effect：
(1) quantum key dispatching system of the utility model, by increasing a polarization beam apparatus in receiving terminal, by signal
Photodegradation is two vertical polarization states, and the interference under respective polarization state is completed using polarization maintaining optical fibre interference ring, is obtained preferable
Result of interference, avoiding birefringence effect in optical fiber transmission process influences influence of the polarization state to result of interference, abandons simultaneously
Deviation-rectifying system, simplifies the lengthy and jumbled degree of system, also reduces production cost；
(2) the utility model only adjusts a phase by an interference ring, to used DAC and analogue amplifier
It is required that there was only 10 minus six powers magnitudes of existing way, the requirement of system design is greatly reduced.Wherein in existing way, sending out
It penetrates end and four phases is adjusted using an interference ring, it is necessary to which high-speed DAC turns modulation voltage during this adjusting again
It changes, it is necessary to which High speed analog amplifier is amplified modulation voltage after conversion the size to required by interference ring；
(3) the utility model uses the interference ring made by planar optical waveguide, since planar optical waveguide is unwise with polarizing
Perception so that system is without additional polarization compensation means, and in addition traditional fiber interferometer is manually to manufacture mostly, and precision is about
Tens micron dimensions, manufacturing process is complex, and the manufacture craft of waveguide is extremely ripe, can reach sub-micrometer scale,
The preferable key for improving system is into code check.
Description of the drawings
Fig. 1 is the functional block diagram of quantum key dispatching system of the utility model based on Waveguide interference ring；
Fig. 2 is the functional block diagram of the utility model Waveguide interference ring.
In figure：Transmitting terminal 100, transmitting terminal driving plate 101, signal laser 102, synchronous laser 103, intensity modulator
104,1*4 polarization-maintaining beam splitters 105, Waveguide interference ring 106, the first adjustable attenuator 107, the second adjustable attenuator 108, transmitting terminal
Multiplexer 109, depolarizer 110, receiving terminal 200, receiving terminal driving plate 201, receiving terminal multiplexer 202, synchroprobe 203,
Polarization beam apparatus 204, single-photon detector 205, front end coupler 1061, rear end coupler 1062, the first coupler 1063 prolong
When waveguide 1064, the second coupler 1065, silicon waveguide 1066, phase-modulator 1067, the 3rd adjustable attenuator 1068, quantum letter
Road 300.
Specific embodiment
The following is a combination of the drawings in the embodiments of the present utility model, and the utility model is clearly and completely described.
As shown in Figure 1, a kind of quantum key dispatching system based on Waveguide interference ring, including what is connected by quantum channel
Transmitting terminal 100 and receiving terminal 200, the transmitting terminal 100 include transmitting terminal driving plate 101, signal laser 102, synchronous laser
Device 103, intensity modulator 104,1*4 polarization-maintaining beam splitters 105, four road Waveguide interference rings 106, the first adjustable attenuator 107, second
Adjustable attenuator 108 and transmitting terminal multiplexer 109, wherein, wavelength division multiplexer or time-division can be used in transmitting terminal multiplexer 109
Multiplexer, four roads Waveguide interference ring, 106 arm length difference is different, and phase difference is respectively 0, pi/2, π, 3 pi/2s, and the signal swashs
Light device 102 is sequentially connected intensity modulator 104,1*4 polarization-maintaining beam splitters 105, and the 1*4 polarization-maintaining beam splitters 105 connect four respectively
Road Waveguide interference ring 106, the four roads Waveguide interference ring 106 are respectively connected with intensity modulator 104, the four roads Waveguide interference ring
106 intensity modulator 104 by each connecting connects the first adjustable attenuator 107, wherein, intensity modulator 104 and first
Depolarizer 110 is connected between adjustable attenuator 107, the depolarizer 110 is used to polarised light being converted to non-polarized light, to protect
The security of signal optical transmission process is demonstrate,proved, first adjustable attenuator 107 connects transmitting terminal multiplexer 109, and the synchronization swashs
Light device 103 is sequentially connected the second adjustable attenuator 108 and transmitting terminal multiplexer 109, first adjustable attenuator 107 and
The same end of two adjustable attenuators 108 connection transmitting terminal multiplexer 109, the transmitting terminal driving plate 101 connect signal and swash respectively
Light device 102, intensity modulator 104, Waveguide interference ring 106, synchronous laser 103, the first adjustable attenuator 107 and second can
Controlled attenuator 108；
The receiving terminal 200 includes receiving terminal driving plate 201, receiving terminal multiplexer 202, synchroprobe 203, polarization point
Beam device 204, two-way Waveguide interference ring 106 and single-photon detector 205, wherein, solution wavelength-division can be used in receiving terminal multiplexer 202
Multiplexer or solution adaptive multiplexer, the receiving terminal multiplexer 202 connect transmitting terminal multiplexer 109 by quantum channel 300,
The other end of the receiving terminal multiplexer 202 connects synchroprobe 203 and polarization beam apparatus 204, the polarization beam splitting respectively
Device 204 connects two-way Waveguide interference ring 106 respectively successively, wherein, two-way Waveguide interference ring 106 is respectively connected with two-way single-photon detecting
Device 205 is surveyed, the receiving terminal driving plate 201 connects synchroprobe 203, Waveguide interference ring 106 and single photon detection respectively
Device 205.
As shown in Fig. 2, the Waveguide interference ring 106 includes front end coupler 1061, long-armed Wave guide unit, galianconism waveguide list
Member and rear end coupler 1062, the output terminal of the front end coupler 1061 connect long-armed Wave guide unit and galianconism ripple respectively
Lead unit, the output terminal of the long-armed Wave guide unit and galianconism Wave guide unit connects rear end coupler 1062, the length respectively
Arm Wave guide unit includes the first coupler 1063, delay 1064 and second coupler 1065 of waveguide, first coupler
1063 connect the output terminal of front end coupler 1061 by silicon waveguide 1066, and first coupler 1063 passes through the waveguide that is delayed
1064 the second couplers 1065 of connection, second coupler 1065 connect the defeated of rear end coupler 1062 by silicon waveguide 1066
Enter end, the galianconism Wave guide unit connects the output terminal of front end coupler 1061 and rear end coupler using silicon waveguide 1064
1062 input terminal is provided with phase-modulator 1067 on the long-armed Wave guide unit and/or galianconism Wave guide unit.
The phase-modulator 1067 makes PN junction using the plasma dispersion effect principle of silicon in silicon waveguide 1066
Structure, the cross section structure of silicon waveguide 1066 is ridged, and the doped structure of PN junction includes but not limited to for PIN type, reversed PN
Type, MOS structure type.The Carrier Profile for changing PN junction is driven by external voltage, and then changes the refraction of doped region silicon waveguide
Rate achievees the purpose that change AMZI (unequal arm interferometer) two-arm phase difference.The response speed of phase-modulator 1067 is subnanosecond
Grade can realize the high speed adjustment of phase.
The delay waveguide 1064 is the waveguide of low-loss silicon, silica waveguide, SiON waveguides, Si3N4Waveguide and polymer
One kind or combination in waveguide.The function of the delay waveguide 1064 is to provide the delay of light, is adopted as low-loss
Waveguide, the loss of unit length are significantly lower than ordinary silicon waveguide.For example, the loss of ordinary silicon waveguide is 2-3dB/cm, and it is sharp
The loss of the delay waveguide 1064 made of silica material only has 0.02dB/cm, and loss is about the 1/100 of ordinary silicon waveguide.
The material of delay waveguide 1064 includes silicon, silica, SiON, Si3N4, polymer (Polymer) etc..It is made of silicon materials
Delay waveguide 1064 is, it is necessary to silicon waveguide be handled by special process such as hydrogen annealings or thermal oxide, the side of reduction silicon waveguide
Wall roughness, to improve the loss of waveguide.Using silica, SiON, Si3N4The delay waveguide 1064 that material makes, it is necessary first to
Material is deposited on silicon base chip using chemical vapour deposition technique (such as PECVD or LPCVD), recycles ultraviolet photolithographic technique
The mask pattern of delay waveguide 8 is formed, is finally shifted mask pattern using ICP (inductively coupled plasma etching) etching technics
Delay waveguide 1064 is formed on to the material of deposition.When making delay waveguide 1064 using polymer, generally require polymer
Material is uniformly spin-coated on silicon base chip by whirl coating technique, and the techniques such as photoetching process or nano impression is recycled to form polymerization
The delay waveguide 1064 of object material.The structure of delay waveguide includes bar shaped, ridged, circle, platypelloid type etc..
In another embodiment, the 3rd adjustable attenuator 1068 is provided on the galianconism Wave guide unit, it is described adjustable to decline
Subtract device 1068 can by by the attenuated optical signal in galianconism to it is long-armed in it is consistent, can reduce to 1064 low-loss of waveguide that is delayed
Requirement.
First coupler 1063 provides optical coupled, the second coupler of silicon waveguide 1066 and delay waveguide 1064
1065 provide delay waveguides 1064 and silicon waveguide 1066 it is optical coupled.The knot of first coupler 1063 and the second coupler 1065
Structure includes adiabatic waveguide coupled structure, back taper coupled structure, evanescent wave coupled structure.
The signal laser 102 is same multiplexed laser with synchronous laser 106, and the multiplexed laser can be used
Time-multiplexed mode emits flashlight and synchronizable optical, and the transmitting terminal multiplexer 109 is adaptive multiplexer, and the receiving terminal is answered
It is solution adaptive multiplexer with device 202.
The utility model additionally provides a kind of quantum key distribution method based on Waveguide interference ring, comprises the following steps：
1) laser triggers：Transmitting terminal is sent out using same clock signal difference trigger signal laser and synchronous laser
Project flashlight and synchronizable optical, the flashlight as modulation light, the synchronizable optical as synchronous transmission of signal to receiving terminal by
Synchroprobe response is used in receiving terminal；
2) state modulation is inveigled：The flashlight of signal laser transmitting carries out random strength modulation by intensity modulator, adjusts
It is made for signal state, inveigles state or vacuum state；
3) transmitting terminal is interfered：Light path is divided by 4 tunnels by 1*4 polarization-maintaining beam splitters, is connected respectively to and is completed by waveguide fabrication
The different unequal arm Waveguide interference ring of 4 tunnel arm length differences, phase difference is respectively 0, pi/2, π, 3 pi/2s, and passes through 4 tunnel intensity modulateds
Device carries out break-make selection, completes the selection of transmitting terminal out of phase modulation；
4) automatically controlled adjustable attenuator decays to flashlight：Depolarizer flashlight carry out it is depolarized, it is depolarized after flashlight
Light pulse is decayed into single photon magnitude by the first adjustable attenuator, synchronizable optical passes through the second adjustable attenuator by synchronizable optical tune
Save the strength range that can be responded to receiving terminal；
5) flashlight and synchronizable optical throughput subchannel transmission：Flashlight passes through quantum with synchronizable optical after transmitting terminal is compound
Transmission decomposes again to receiving terminal, and in receiving terminal, and flashlight enters polarization beam apparatus, and synchronizable optical passes through synchronous optical detection
Device detects；
6) polarization beam apparatus beam splitting：The light of asynchronous polarization is decomposed into horizontal polarization direction by polarization beam apparatus and is hung down
Straight polarization direction；
7) receiving terminal is interfered：The flashlight of horizontal polarization direction and vertical polarization is respectively connected to two brachiums of two-way
The different Waveguide interference ring of difference carries out phase-modulation, and phase difference is respectively 0, pi/2, completes the selection of receiving terminal out of phase；
8) single-photon detector detects：Single-photon detector detects optical signals, and safe key is generated for subsequent processing.
In the step 5), wavelength-division multiplex or time-multiplexed side can be used transmitting terminal is compound to flashlight and synchronizable optical
Formula carries out, and wavelength-division multiplex or solution time division multiplexing mode progress are solved in corresponding use of receiving terminal decomposition.
If the mode of the step 5) flashlight and synchronizable optical multiplexing of transmission uses time division multiplexing, the signal laser
Any one laser timesharing can be used with synchronous laser and send flashlight and synchronizable optical, drive single laser in systems
Flashlight and synchronizable optical are emitted using time-multiplexed mode, effectively reduce the numerous and diverse degree and production cost of system.
The system structure of comprehensive the utility model understands that the utility model has the advantages that with principle：
(1) quantum key dispatching system of the utility model, by increasing a polarization beam apparatus in receiving terminal, by signal
Photodegradation is two vertical polarization states, and the interference under respective polarization state is completed using polarization maintaining optical fibre interference ring, is obtained preferable
Result of interference, avoiding birefringence effect in optical fiber transmission process influences influence of the polarization state to result of interference, abandons simultaneously
Deviation-rectifying system, simplifies the lengthy and jumbled degree of system, also reduces production cost；
(2) the utility model only adjusts a phase by an interference ring, to used DAC and analogue amplifier
It is required that there was only 10 minus six powers magnitudes of existing way, the requirement of system design is greatly reduced.Wherein in existing way, sending out
It penetrates end and four phases is adjusted using an interference ring, it is necessary to which high-speed DAC turns modulation voltage during this adjusting again
It changes, it is necessary to which High speed analog amplifier is amplified modulation voltage after conversion the size to required by interference ring；
(3) the utility model uses the interference ring made by planar optical waveguide, since planar optical waveguide is unwise with polarizing
Perception so that system is without additional polarization compensation means, and in addition traditional fiber interferometer is manually to manufacture mostly, and precision is about
Tens micron dimensions, manufacturing process is complex, and the manufacture craft of waveguide is extremely ripe, can reach sub-micrometer scale,
The preferable key for improving system is into code check.
Claims (4)
1. a kind of quantum key dispatching system based on Waveguide interference ring, it is characterised in that：Including what is connected by quantum channel
Transmitting terminal and receiving terminal, the transmitting terminal include transmitting terminal driving plate, signal laser, synchronous laser, intensity modulator, 1*
4 polarization-maintaining beam splitters, four road Waveguide interference rings, the first adjustable attenuator, the second adjustable attenuator and transmitting terminal multiplexer, it is described
Four road Waveguide interference ring arm length differences are different, and phase difference is respectively 0, pi/2, π, 3 pi/2s, and the signal laser is sequentially connected by force
Modulator, 1*4 polarization-maintaining beam splitters are spent, the 1*4 polarization-maintaining beam splitters connect four road Waveguide interference rings respectively, and four tunnel waveguide is done
It relates to ring and is respectively connected with intensity modulator, the four roads Waveguide interference ring is adjustable by the intensity modulator connection first each connected
Attenuator, first adjustable attenuator connect transmitting terminal multiplexer, and the synchronous laser is sequentially connected the second adjustable damping
Device and transmitting terminal multiplexer, first adjustable attenuator are connected the same of transmitting terminal multiplexer with the second adjustable attenuator
End, the transmitting terminal driving plate connect respectively signal laser, intensity modulator, Waveguide interference ring, synchronous laser, first can
Controlled attenuator and the second adjustable attenuator；
The receiving terminal is done including receiving terminal driving plate, receiving terminal multiplexer, synchroprobe, polarization beam apparatus, two-way waveguide
Ring and single-photon detector are related to, the receiving terminal multiplexer connects transmitting terminal multiplexer, the receiving terminal by quantum channel
The other end of multiplexer connects synchroprobe and polarization beam apparatus respectively, and the polarization beam apparatus connects two-way ripple respectively successively
Interference ring is led, wherein, two-way Waveguide interference ring is respectively connected with two-way single-photon detector, and the receiving terminal driving plate connects respectively
Synchroprobe, Waveguide interference ring and single-photon detector.
2. the quantum key dispatching system as described in claim 1 based on Waveguide interference ring, which is characterized in that the waveguide is done
Relate to ring include front end coupler, long-armed Wave guide unit, galianconism Wave guide unit and rear end coupler, the front end coupler it is defeated
Outlet connects long-armed Wave guide unit and galianconism Wave guide unit respectively, the long-armed Wave guide unit and galianconism Wave guide unit it is defeated
Outlet connects rear end coupler respectively, and the long-armed Wave guide unit includes the first coupler, delay waveguide and the second coupler,
First coupler connects the output terminal of front end coupler by silicon waveguide, and first coupler is connected by the waveguide that is delayed
Second coupler, second coupler connect the input terminal of rear end coupler by silicon waveguide, and the galianconism Wave guide unit is adopted
With the output terminal of silicon waveguide connection front end coupler and the input terminal of rear end coupler, the long-armed Wave guide unit and/or short
Phase-modulator is provided on arm Wave guide unit.
3. the quantum key dispatching system as claimed in claim 2 based on Waveguide interference ring, which is characterized in that the delay ripple
It leads as the waveguide of low-loss silicon, silica waveguide, SiON waveguides, Si3N4One kind or combination in waveguide and polymer waveguide,
Adjustable attenuator is provided on the galianconism Wave guide unit.
4. the quantum key dispatching system as claimed in claim 2 based on Waveguide interference ring, which is characterized in that the signal swashs
Light device is same multiplexed laser with synchronous laser, and the multiplexed laser can be used time-multiplexed mode and emit flashlight
With synchronizable optical, the transmitting terminal multiplexer is adaptive multiplexer, and the receiving terminal multiplexer is solution adaptive multiplexer.
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| CN107276758A (en) * | 2017-07-28 | 2017-10-20 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on Waveguide interference ring |
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| CN107276758A (en) * | 2017-07-28 | 2017-10-20 | 浙江九州量子信息技术股份有限公司 | A kind of quantum key dispatching system and method based on Waveguide interference ring |
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