CN208707653U - CVQKD sending device and system based on self-stabilization intensity modulated - Google Patents
CVQKD sending device and system based on self-stabilization intensity modulated Download PDFInfo
- Publication number
- CN208707653U CN208707653U CN201820967093.9U CN201820967093U CN208707653U CN 208707653 U CN208707653 U CN 208707653U CN 201820967093 U CN201820967093 U CN 201820967093U CN 208707653 U CN208707653 U CN 208707653U
- Authority
- CN
- China
- Prior art keywords
- port
- intensity modulated
- self
- beam splitter
- cvqkd
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
Links
Landscapes
- Optical Communication System (AREA)
Abstract
The utility model provides a kind of CVQKD sending device and system based on self-stabilization intensity modulated, including pulse laser, the first beam splitter, adjustable optical attenuator, self-stabilization intensity modulated device, first phase modulator, time-delay mechanism and the first polarization beam apparatus；Pulse laser is for generating periodic pulse train；First beam splitter is for being split the pulse train；Adjustable optical attenuator is used to that self-stabilization intensity modulated device will to be inputted after signal optical attenuation；Self-stabilization intensity modulated device includes the second beam splitter and second phase modulator；First phase modulator is by the signal light of signal photogenerated Gaussian modulation；Time-delay mechanism inputs the first polarization beam apparatus after the signal light of Gaussian modulation is delayed；First polarization beam apparatus will export after the signal light of the Gaussian modulation after delay and local oscillator combiner.The CVQKD sending device and system based on self-stabilization intensity modulated of the utility model realizes the modulation to light field orthogonal amplitude.
Description
Technical field
The utility model relates to continuous variable quantum key distribution (Continuous-Variable Quantum Key
Distribution, CVQKD) technical field, more particularly to a kind of CVQKD sending device based on self-stabilization intensity modulated
And system.
Background technique
CVQKD agreement frequently with GG02 scheme in, transmitting terminal needs quadrature component (position and the momentum of pair coherent state
Component) the dimensional Gaussian modulation that mean value is zero is done, common method is realized by using amplitude modulaor and phase-modulator
Dimensional Gaussian modulation to two quadrature components.
It generallys use in the prior art and the lithium niobate modulator of Dare structure is increased based on Mach to construct CVQKD diostribution device
In amplitude (or intensity) modulator.However, in actual application, the two-arm brachium that Mach increases Dare interferometer is difficult sternly
Lattice ensure unanimously so that amplitude modulaor interference contrast is bad, eventually lead in CVQKD system to light field orthogonal amplitude into
Row is modulated ineffective.
In addition, the phase difference of two-arm can not keep long-term stability, such as the length of interferometer two-arm to hold when interference
Vulnerable to the external environments such as temperature influence and change, this transformation will introduce one not on last compound signal
Wish and unknown phase difference, generates drift so as to cause amplitude modulation result.It is thus typically necessary to the volume in signal light optical path
It is outer to increase corresponding intensity feedback device to make up this unknown variation.This just make it is ineffective in actual intensity modulated,
Stability is bad, and structure is complicated, and higher cost, is unfavorable for the popularization and application of large scale integration.
Utility model content
In view of the foregoing deficiencies of prior art, the purpose of this utility model is to provide one kind to be based on self-stabilization intensity
The CVQKD sending device and system of modulation, using the self-stabilization intensity modulated for being based on Sagnac effect (Sagnac Effect)
Device carries out amplitude modulation, provides completely the same optical path for two light components for interference, and by two light point
Amount carries out different phase-modulation and forms that phase modulation is poor therebetween, to generate different result of interference, realizes pair
The modulation of light field orthogonal amplitude.In addition, general Mach increases Dare amplitude modulaor frequently with X cut type amplitude modulaor, will not produce
Raw additional phase-modulation effect, and the utility model is to non-zero caused by the intensity modulated device based on Sagnac structure
Phase-modulation effect is considered, is corrected in the phase-modulation needed for CVQKD.
In order to achieve the above objects and other related objects, the utility model provides a kind of based on self-stabilization intensity modulated
CVQKD sending device and system, including pulse laser, the first beam splitter, adjustable optical attenuator, self-stabilization intensity modulated dress
It sets, first phase modulator, time-delay mechanism and the first polarization beam apparatus；The pulse laser is for generating recurrent pulse sequence
Column；First beam splitter is connected with the pulse laser, for being split to the pulse train, generate local oscillator light and
Signal light；The local oscillator light inputs first polarization beam apparatus, and the signal light inputs the adjustable optical attenuator；It is described can
Optical attenuator is connected with first beam splitter, for will input the self-stabilization intensity modulated dress after the signal optical attenuation
It sets；The self-stabilization intensity modulated device includes the second beam splitter and second phase modulator；Second beam splitter includes the
Single port, second port, third port and the 4th port, the second port connect to form two-way ring light with the third port
Road；The first port or the 4th port are connected to obtain the signal light after the decaying with the adjustable optical attenuator, described
Second port and the third port export the first component and second component after the second beam splitter beam splitting respectively, described
4th port or first port export the signal light after intensity modulated；The second phase modulator and the second port and
The third port is connected, for carrying out phase-modulation to first component and/or the second component, so that described first
Component and the second component have phase difference；The first phase modulator is used for the signal photoproduction after the intensity modulated
It is the signal light of Gaussian modulation at light field quadrature component；The time-delay mechanism is connected with the first phase modulator, and being used for will
First polarization beam apparatus is inputted after the signal light delay of the Gaussian modulation；First polarization beam apparatus will be for that will be delayed
It is exported after the signal light of modulation afterwards and the local oscillator combiner.
In an embodiment of the present invention, the splitting ratio of first beam splitter is 99:1；Second beam splitter
Splitting ratio is 50:50.
In an embodiment of the present invention, the first phase modulator and the second phase modulator are respectively by two
The control of the different channels of a quantum random number generator or quantum random number generator, two quantum random number generators or
The different channels of one quantum random number generator generate meet modulation variance be VN, the Gaussian Profile that mean value is zero it is a series of
Random array, each array are modulated a signal pulse, to generate the signal light of Gaussian modulation；V is customized system
Number, N is shot noise.
It further include the optical delivery unit being connected with second beam splitter in an embodiment of the present invention；It is described
Optical delivery unit includes first port, second port and third port, and the first port is used for the signal after receiving attenuation
Light, the second port are connected to the first port of second beam splitter by polarization maintaining optical fibre, and the third port is for defeated
Out through the signal light of intensity modulated；The third port or described second of the first phase modulator and the optical delivery unit
The first port of beam splitter or the 4th port are connected；The optical delivery unit uses circulator or beam splitter.
In an embodiment of the present invention, the time-delay mechanism includes that the faraday rotation mirror being sequentially connected, optical fiber prolong
When line and the second polarization beam apparatus, the signal light of the Gaussian modulation inputs second polarization beam apparatus, second polarization
The output light output of beam splitter is to first polarization beam apparatus.
It further include amplitude modulaor in an embodiment of the present invention, the amplitude modulaor and the pulse laser
Device is connected with first beam splitter, for inputting first beam splitter after the pulse train is carried out amplitude modulation.
In an embodiment of the present invention, the amplitude modulaor uses the self-stabilization intensity modulated device.
In an embodiment of the present invention, first beam splitter and second beam splitter are polarization-maintaining beam splitter；
The first phase modulator and the second phase modulator are polarization-maintaining phase-modulator.
In an embodiment of the present invention, self-stabilization intensity modulated device signal light generation when being modulatedPhase shift；When the first phase modulator is modulated, deductPhase shift；VsFor institute
State the voltage on the clockwise direction pulsed light obtained after the second beam splitter beam splitting, VnTo be obtained after the second beam splitter beam splitting
Counter clockwise direction pulsed light on voltage, VπFor the half-wave voltage on the second phase modulator.
In an embodiment of the present invention, when second beam splitter uses first port as output port, institute
The voltage stated in the counter clockwise direction and clockwise pulsed light obtained after the second beam splitter beam splitting is 2kVπ, wherein k
=0,1,2 ...；When second beam splitter uses the 4th port as output port, modulation voltage need to additionally increase (1+2k)
Vπ, wherein k=0,1,2 ..., VπFor the half-wave voltage of the second phase modulator.
Finally, the utility model provides a kind of CVQKD system based on self-stabilization intensity modulated, including above-mentioned based on certainly
The CVQKD sending device and CVQKD reception device of strength of stability modulation.
As described above, the CVQKD sending device and system based on self-stabilization intensity modulated of the utility model, have following
The utility model has the advantages that
(1) amplitude modulation is carried out using the self-stabilization intensity modulated device based on Sagnac effect, for for interfering
Two light components completely the same optical path is provided；
(2) by carrying out different phase-modulations to two light components, to form phase modulation therebetween poor, to produce
Raw different result of interference, realizes the modulation to light field orthogonal amplitude；
(3) Sagnac effect self-stabilization intensity modulated device generate phase-modulation effect, by with other phase
Position modulator is cooperated, and can realize the modulation to light field quadrature phase together；
(4) stability is good, and structure is simple, is conducive to the popularization and application of large scale integration.
Detailed description of the invention
Fig. 1 be shown as the utility model based on the CVQKD sending device of self-stabilization intensity modulated in an embodiment
Structural schematic diagram；
The self-stabilization intensity modulated that Fig. 2 is shown as the utility model is installed on the structural schematic diagram in an embodiment；
The self-stabilization intensity modulated that Fig. 3 is shown as the utility model is installed on the structural schematic diagram in another embodiment；
Fig. 4 is shown as the structure based on the CVQKD system of self-stabilization intensity modulated in an embodiment of the utility model
Schematic diagram；
Fig. 5 is shown as the variation schematic diagram of the voltage relevant parameter on the self-stabilization intensity modulated device of the utility model；
Fig. 6 be shown as the utility model based on the CVQKD sending method of self-stabilization intensity modulated in an embodiment
Flow chart；
Fig. 7 is shown as structural schematic diagram of the CVQKD system of the utility model in an embodiment.
Component label instructions
1 pulse laser
2 first beam splitters
3 adjustable optical attenuators
4 self-stabilization intensity modulated devices
41 second beam splitters
42 second phase modulators
43 optical delivery units
5 first phase modulators
6 time-delay mechanisms
61 faraday rotation mirrors
62 fiber delay lines
63 second polarization beam apparatus
7 first polarization beam apparatus
8 amplitude modulaors
9 Polarization Controllers
10 third polarization beam apparatus
11 the 4th polarization beam apparatus
12 fiber delay lines
13 faraday rotation mirrors
14 balanced detectors
15 third phase modulators
The 71 CVQKD sending devices based on self-stabilization intensity modulated
72 CVQKD reception devices
Specific embodiment
The embodiments of the present invention is illustrated by particular specific embodiment below, those skilled in the art can be by this
Content disclosed by specification understands other advantages and effect of the utility model easily.
It should be clear that structure, ratio, size etc. that the appended diagram of this specification is depicted, only to cooperate specification to be taken off
The content shown is not intended to limit the utility model enforceable restriction item so that those skilled in the art understands and reads
Part, therefore do not have technical essential meaning, the modification of any structure, the change of proportionate relationship or the adjustment of size are not influencing
Under the effect of the utility model can be generated and the purpose that can reach, should all still it fall in the revealed technology of the utility model
In the range of Rong get Neng is covered.Meanwhile it is cited such as "upper", "lower", "left", "right", " centre " and " one " in this specification
Deng term, be merely convenient to being illustrated for narration, rather than to limit the enforceable range of the utility model, relativeness
It is altered or modified, under the content of no substantial changes in technology, when being also considered as the enforceable scope of the utility model.In addition, in this reality
In novel unless specifically defined or limited otherwise, the terms such as term " connected ", " connection " shall be understood in a broad sense, for example, can
To be to be connected directly, the connection inside two elements can also be can be indirectly connected through an intermediary.For this field
For those of ordinary skill, the concrete meaning of above-mentioned term in the present invention can be understood as the case may be.
As shown in Figure 1, in an embodiment, the CVQKD sending device based on self-stabilization intensity modulated of the utility model
Including pulse laser 1, the first beam splitter 2, adjustable optical attenuator 3, self-stabilization intensity modulated device 4, first phase modulator
5, time-delay mechanism 6 and the first polarization beam apparatus 7.
The pulse laser 1 is for generating periodic pulse train.The periodic pulse train can be the pulse and swash
Light device 1 is generated by internal modulation, is also possible to carry out copped wave generation to the light that the pulse laser 1 exports by chopper.
Preferably, the chopper is amplitude modulaor, it is preferable that amplitude modulaor is self-stabilization intensity modulated device.
First beam splitter 2 is connected with the pulse laser 1, for being split to the pulse train, generates
Local oscillator light and signal light；The local oscillator light inputs first polarization beam apparatus 7, and the signal light inputs the variable optical attenuation
Device 3.
Preferably, first beam splitter 2 uses high splitting ratio, if the beam splitter of 99:1 is divided, wherein stronger
Light beam inputs a port of first polarization beam apparatus 7 as local oscillator light；Weaker light beam inputs the tunable optical
Attenuator 3 is used as signal light.
The adjustable optical attenuator 3 is connected with first beam splitter 2, for it will input after the signal optical attenuation described in
Self-stabilization intensity modulated device 4.
The self-stabilization intensity modulated device 4 includes the second beam splitter 41 and second phase modulator 42；Described second point
Beam device 41 includes first port, second port, third port and the 4th port, and the second port is connected with the third port
Form two-way ring optical path；After the first port or the 4th port are connected with the adjustable optical attenuator 3 to obtain the decaying
Signal light, the second port and the third port export the first component after 2 beam splitting of the second beam splitter respectively
And second component, the 4th port or first port export the signal light after intensity modulated；The second phase modulator
42 are connected with the second port and the third port, for carrying out phase to first component and/or the second component
Position modulation, so that first component and the second component have phase difference θ.It should be noted that second beam splitting
The first port of device 41 and the 4th port function can be interchanged, i.e., the 4th port inputs the signal light after the decaying, first end
Signal light of the mouth output after intensity modulated；Or first port inputs the signal light after the decaying, the 4th port output warp
Signal light after intensity modulated.
As shown in Fig. 2, second beam splitter 41 includes first port 1A, second port 1B, third in an embodiment
Port 1C and the 4th port 1D.It connects to form a two-way ring light by polarization maintaining optical fibre between second port 1B and third port 1C
Road.Second phase modulator is connected with second port 1B and third port 1C.Wherein, when first port 1A is input terminal, the
Two-port netwerk 1B and third port 1C can be respectively reflection output end and transmission output end；When second port 1B is input terminal,
First port 1A and the 4th port 1D can be respectively reflection output end and transmission output end.
Preferably, second beam splitter 41 uses splitting ratio for the beam splitter of 50:50.
The first phase modulator 5 is used to the signal photogenerated light field quadrature component after the intensity modulated be Gauss
The signal light of modulation.Wherein, the light field quadrature component is position and momentum component.
Specifically, the first phase modulator 5 and the second phase modulator 42 are respectively by two quantum random numbers
The control of the different channels of generator or a quantum random number generator, two quantum random number generators or a quantum are random
The different channels of number generator generate meet modulation variance be VN, a series of random arrays for the Gaussian Profile that mean value is zero (x,
P), each array is modulated a signal pulse, is finally modulated into signal light | x+ip > coherent state, that is, generate full
The signal light of sufficient Gaussian modulation.Wherein, V is customized coefficient, and N is shot noise.
In an embodiment of the present invention, as shown in figure 3, the self-stabilization intensity modulated device 4 of the utility model also wraps
Include the optical delivery unit 43 being connected with second beam splitter；The optical delivery unit 43 includes first port 3A, second
Port 3B and third port 3C, the first port 3A are used for the signal light after receiving attenuation, and the second port 3B passes through guarantor
Polarisation fibre is connected to the first port of second beam splitter 41, and the third port 3C is for exporting the signal through intensity modulated
Light；The of the first phase modulator 5 and second beam splitter of third port 3C or described 41 of the optical delivery unit 43
Single port or the 4th port are connected.Preferably, in the optical delivery unit 43, the light inputted from first port can be by second
Port output, but cannot be exported from third port；The light inputted from second port can be exported by third port.Specifically, institute
Optical delivery unit is stated using circulator or beam splitter.
The time-delay mechanism 6 is connected with the first phase modulator 5, for the signal light of the Gaussian modulation to be delayed
After input first polarization beam apparatus 7.
Preferably, as shown in figure 4, the time-delay mechanism 6 includes faraday rotation mirror (FM2) 61, the optical fiber being sequentially connected
Delay line 62 and the second polarization beam apparatus 63, the signal light of the Gaussian modulation inputs second polarization beam apparatus 63, described
The output light output of second polarization beam apparatus 63 is to first polarization beam apparatus 7.The signal light of the Gaussian modulation passes through institute
After stating time-delay mechanism, it is poor that the regular hour is generated with the local oscillator light pulse.
First polarization beam apparatus 7 is defeated after the signal light and the local oscillator combiner for the Gaussian modulation after being delayed
Out.
In an embodiment of the present invention, the CVQKD sending device based on self-stabilization intensity modulated of the utility model
It further include amplitude modulaor 8, the amplitude modulaor 8 is connected with the pulse laser 1 and first beam splitter 2, is used for
First beam splitter 2 is inputted after the pulse train is carried out amplitude modulation.Higher disappear is usually required in CVQKD system
Light ratio, if pulse laser generate pulse train extinction ratio it is inadequate, need by the amplitude modulation of amplitude modulaor come
The extinction ratio of the pulse train is further increased, then inputs first beam splitter again.
Preferably, the amplitude modulaor uses the self-stabilization intensity modulated device.
Preferably, first beam splitter and second beam splitter are polarization-maintaining beam splitter；The first phase modulation
Device and the second phase modulator are polarization-maintaining phase-modulator.
The CVQKD sending device based on self-stabilization intensity modulated that following is a brief introduction of the utility model is corresponding
The working principle of CVQKD reception device.As shown in figure 4, the signal light and the local oscillator light of the Gaussian modulation after delay are via the
One polarization beam apparatus 7 passes through the incoming CVQKD reception device of optical fiber after closing beam.It is birefringent equivalent when being transmitted in a fiber due to light
It answers, it is necessary first to carry out polarization amendment and compensation by 9 pairs of light of Polarization Controller, then light is via 10 weight of third polarization beam apparatus
Newly local oscillator light and signal light are separated, wherein local oscillator light is revolved via the 4th polarization beam apparatus 11, fiber delay line 12 and faraday
It just meets at balanced detector (BHD) 14 after the time-delay mechanism that tilting mirror (FM2) 13 is constituted with signal light, i.e., in timing again
It is synchronous.Local oscillator light carries out phase-modulation by third phase modulator 15, and third phase modulator 15 is occurred by quantum random number
Device control can measure the quadrature component x or p of light field according to the output difference of quantum random number generator respectively.Received dress
It sets the signal light isolated and local oscillator light while entering in balanced detector (BHD) and measure, if using heterodyne detector
It is detected, is then not necessarily to third phase modulator, and the quadrature component x and p of light field can be measured simultaneously.
Since CVQKD system is related to phase-modulation, the self-stabilization intensity modulated device of the utility model contains phase
Modulator, therefore influence of the self-stabilization intensity modulated device to phase-modulation be can not ignore, and be computed and compensated.
As shown in fig. 5, it is assumed that the signal light of input self-stabilization intensity modulated device is the recurrent pulse light for being Tp the period.Through
It is divided into clockwise S pulsed light and N pulsed light counterclockwise after crossing the second beam splitter beam splitting, S pulsed light and N pulsed light arrive
Up to the time difference Tsn of second phase modulator.First port 1A is set as the output port of self-stabilization intensity modulated device, load exists
Voltage on N pulsed light is Vn, the half-wave voltage of second phase modulator is Vπ, according to the principle N pulse of phase-modulator
The phase that light is modulated isVoltage of the load on S pulsed light is set as Vs, then S pulsed light is modulated phase
ForAssuming that the initial light field for being incident on the self-stabilization intensity modulated device is Ein, initial phase zero ignores each
The insertion loss of device, then the light field after the second beam splitter in S and N both direction beBy second phase modulator
After modulation, the light field being emitted through the second beam splitter is
From the foregoing, it will be observed that being had occurred between optical output field and incident fieldPhase shift.Second phase modulators modulate phase and voltage
Relationship isWherein V (t) is the voltage signal that load changes over time on second phase modulator.Using from surely
Intensity modulated device is determined to meeting after light field progress quadrature amplitude modulation so that phase occursDrift.Therefore,
It needs to deduct when being modulated light field quadrature phase using first phase modulatorPhase shift section.Usually
It is simple, it can be set VsOr V (t)=0n(t)=0.Set output end of the first port 1A as self-stabilization intensity modulated device
Mouthful, then voltage of the load on N pulsed light and S pulsed light is 2kVπ, wherein k=0,1,2 ....Preferably, k=0.According to
4th port 1D is as output port, when obtaining the result as first port 1A, former modulation voltage is needed to increase (1+
2k)Vπ, wherein k=0,1,2 ....Preferably k=0.
It should be noted that the above results do not consider the insertion loss of each device, corresponding electricity when insertion loss is considered
Pressure is easy to be calculated based on the above results.
As shown in fig. 6, in an embodiment, the CVQKD sending method based on self-stabilization intensity modulated of the utility model
Applied to the CVQKD sending device based on self-stabilization intensity modulated, the CVQKD sending device based on self-stabilization intensity modulated
Including pulse laser, the first beam splitter, adjustable optical attenuator, self-stabilization intensity modulated device, first phase modulator, delay
Device and the first polarization beam apparatus；The CVQKD sending method based on self-stabilization intensity modulated the following steps are included:
Step S61, periodic pulse train is generated based on the pulse laser.
Step S62, the pulse train is split based on first beam splitter, generates local oscillator light and signal light；
The local oscillator light inputs the first polarization beam apparatus, and the signal light inputs adjustable optical attenuator.
Step S63, self-stabilization intensity modulated device will be inputted based on the adjustable optical attenuator after the signal optical attenuation.
Step S64, intensity modulated is carried out to the signal light after decaying based on the self-stabilization intensity modulated device, wherein institute
Stating self-stabilization intensity modulated device includes the second beam splitter and second phase modulator；Second beam splitter includes first end
Mouth, second port, third port and the 4th port, the second port connect to form two-way ring optical path with the third port；
The first port or the 4th port are connected to obtain the signal light after the decaying with the adjustable optical attenuator, and described second
Port and the third port export the first component and second component after the second beam splitter beam splitting respectively, and the described 4th
Port or first port export the signal light after intensity modulated；The second phase modulator and the second port and described
Third port is connected, and phase-modulation is carried out to first component and/or the second component, so that first component and institute
Second component is stated with phase difference.
Step S65, based on the first phase modulator by orthogonal point of signal photogenerated light field after the intensity modulated
Amount is the signal light of Gaussian modulation.
Step S66, the first polarization beam splitting is inputted after the signal light of the Gaussian modulation being delayed based on the time-delay mechanism
Device.
Step S67, based on first polarization beam apparatus by the signal light of the Gaussian modulation after delay and the local oscillator light
It is exported after closing beam.
As shown in fig. 7, in an embodiment, the CVQKD system based on self-stabilization intensity modulated of the utility model includes
The above-mentioned CVQKD sending device 71 and CVQKD reception device 72 based on self-stabilization intensity modulated.
Wherein, the CVQKD reception device 72 is CVQKD reception device customary in the art, therefore details are not described herein.
It is based in conclusion the CVQKD sending device and system based on self-stabilization intensity modulated of the utility model use
The self-stabilization intensity modulated device of Sagnac effect carries out amplitude modulation, provides completely for two light components for interference
Consistent optical path；By carrying out different phase-modulations to two light components, to form phase modulation therebetween poor, to produce
Raw different result of interference, realizes the modulation to light field orthogonal amplitude；The self-stabilization intensity modulated device of Sagnac effect
The phase-modulation effect of generation can be realized by being cooperated with other phase-modulator to light field quadrature phase together
Modulation；Stability is good, and structure is simple, is conducive to the popularization and application of large scale integration.So effective gram of the utility model
It has taken various shortcoming in the prior art and has had high industrial utilization value.
The above embodiments are only illustrative of the principle and efficacy of the utility model, and not for limitation, this is practical new
Type.Any person skilled in the art can all carry out above-described embodiment under the spirit and scope without prejudice to the utility model
Modifications and changes.Therefore, such as those of ordinary skill in the art without departing from the revealed essence of the utility model
All equivalent modifications or change completed under mind and technical idea, should be covered by the claim of the utility model.
Claims (11)
1. a kind of CVQKD sending device based on self-stabilization intensity modulated, it is characterised in that: including pulse laser, first point
Beam device, adjustable optical attenuator, self-stabilization intensity modulated device, first phase modulator, time-delay mechanism and the first polarization beam apparatus；
The pulse laser is for generating periodic pulse train；
First beam splitter is connected with the pulse laser, for being split to the pulse train, generates local oscillator light
And signal light；The local oscillator light inputs first polarization beam apparatus, and the signal light inputs the adjustable optical attenuator；
The adjustable optical attenuator is connected with first beam splitter, for will input the self-stabilization after the signal optical attenuation
Intensity modulated device；
The self-stabilization intensity modulated device includes the second beam splitter and second phase modulator；Second beam splitter includes the
Single port, second port, third port and the 4th port, the second port connect to form two-way ring light with the third port
Road；The first port or the 4th port are connected to obtain the signal light after the decaying with the adjustable optical attenuator, described
Second port and the third port export the first component and second component after the second beam splitter beam splitting respectively, described
4th port or first port export the signal light after intensity modulated；The second phase modulator and the second port and
The third port is connected, for carrying out phase-modulation to first component and/or the second component, so that described first
Component and the second component have phase difference；
The first phase modulator is used to the signal photogenerated light field quadrature component after the intensity modulated be Gaussian modulation
Signal light；
The time-delay mechanism is connected with the first phase modulator, for inputting after the signal light of the Gaussian modulation is delayed
First polarization beam apparatus；
First polarization beam apparatus is used to export after the signal light and the local oscillator combiner of the Gaussian modulation after delay.
2. the CVQKD sending device according to claim 1 based on self-stabilization intensity modulated, it is characterised in that: described
The splitting ratio of one beam splitter is 99:1；The splitting ratio of second beam splitter is 50:50.
3. the CVQKD sending device according to claim 1 based on self-stabilization intensity modulated, it is characterised in that: described
One phase-modulator and the second phase modulator are respectively by two quantum random number generators or a quantum random number hair
The different channels of the different channels control of raw device, two quantum random number generators or a quantum random number generator generate full
Foot modulation variance be V*N, a series of random arrays for the Gaussian Profile that mean value is zero, each array to a signal pulse into
Row modulation, to generate the signal light for meeting Gaussian modulation requirement；V is customized coefficient, and N is shot noise.
4. the CVQKD sending device according to claim 1 based on self-stabilization intensity modulated, it is characterised in that: further include
The optical delivery unit being connected with second beam splitter；The optical delivery unit includes first port, second port and
Three ports, the first port are used for the signal light after receiving attenuation, and the second port is connected to described by polarization maintaining optical fibre
The first port of second beam splitter, the third port is for exporting the signal light through intensity modulated；The first phase modulation
Device is connected with the first port or the 4th port of the third port of the optical delivery unit or second beam splitter；The light
It learns transmission unit and uses circulator or beam splitter.
5. the CVQKD sending device according to claim 1 based on self-stabilization intensity modulated, it is characterised in that: described to prolong
When device include the faraday rotation mirror being sequentially connected, fiber delay line and the second polarization beam apparatus, the letter of the Gaussian modulation
Number light inputs second polarization beam apparatus, the output light output of second polarization beam apparatus to first polarization beam splitting
Device.
6. the CVQKD sending device according to claim 1 based on self-stabilization intensity modulated, it is characterised in that: further include
Amplitude modulaor, the amplitude modulaor are connected with the pulse laser and first beam splitter, are used for the pulse
Sequence inputs first beam splitter after carrying out amplitude modulation.
7. the CVQKD sending device according to claim 6 based on self-stabilization intensity modulated, it is characterised in that: the vibration
Width modulator uses the self-stabilization intensity modulated device.
8. the CVQKD sending device according to claim 1 based on self-stabilization intensity modulated, it is characterised in that: described
One beam splitter and second beam splitter are polarization-maintaining beam splitter；The first phase modulator and the second phase modulator
It is polarization-maintaining phase-modulator.
9. the CVQKD sending device according to claim 1 based on self-stabilization intensity modulated, it is characterised in that: it is described from
Strength of stability modulating device signal light generation [V when being modulateds(t)+Vn(t)]π/(2Vπ) phase shift；First phase
When position modulator is modulated, [V is deducteds(t)+Vn(t)]π/(2Vπ) phase shift；VsTo be obtained after the second beam splitter beam splitting
Clockwise direction pulsed light on voltage, VnFor on the counter clockwise direction pulsed light that is obtained after the second beam splitter beam splitting
Voltage, VπFor the half-wave voltage on the second phase modulator.
10. the CVQKD sending device according to claim 1 based on self-stabilization intensity modulated, it is characterised in that: when described
Second beam splitter using first port as output port when, the counter clockwise direction that is obtained after the second beam splitter beam splitting and suitable
Voltage on conterclockwise pulsed light is 2kVπ, wherein k=0,1,2 ...；When second beam splitter uses the 4th port
When as output port, modulation voltage need to additionally increase (1+2k) Vπ, wherein k=0,1,2 ..., VπFor second phase modulation
The half-wave voltage of device.
11. a kind of CVQKD system based on self-stabilization intensity modulated, it is characterised in that: including described in one of claim 1-10
The CVQKD sending device and CVQKD reception device based on self-stabilization intensity modulated.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820967093.9U CN208707653U (en) | 2018-06-22 | 2018-06-22 | CVQKD sending device and system based on self-stabilization intensity modulated |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820967093.9U CN208707653U (en) | 2018-06-22 | 2018-06-22 | CVQKD sending device and system based on self-stabilization intensity modulated |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN208707653U true CN208707653U (en) | 2019-04-05 |
Family
ID=65936914
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820967093.9U Withdrawn - After Issue CN208707653U (en) | 2018-06-22 | 2018-06-22 | CVQKD sending device and system based on self-stabilization intensity modulated |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN208707653U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110456468A (en) * | 2019-09-17 | 2019-11-15 | 安徽光纤光缆传输技术研究所(中国电子科技集团公司第八研究所) | A kind of quantum optical device spatial mixing integrated package |
| CN110635895A (en) * | 2018-06-22 | 2019-12-31 | 科大国盾量子技术股份有限公司 | CVQKD (constant velocity quantum key distribution) sending device and method based on self-stabilization intensity modulation and CVQKD system |
-
2018
- 2018-06-22 CN CN201820967093.9U patent/CN208707653U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110635895A (en) * | 2018-06-22 | 2019-12-31 | 科大国盾量子技术股份有限公司 | CVQKD (constant velocity quantum key distribution) sending device and method based on self-stabilization intensity modulation and CVQKD system |
| CN110456468A (en) * | 2019-09-17 | 2019-11-15 | 安徽光纤光缆传输技术研究所(中国电子科技集团公司第八研究所) | A kind of quantum optical device spatial mixing integrated package |
| CN110456468B (en) * | 2019-09-17 | 2024-04-05 | 安徽光纤光缆传输技术研究所(中国电子科技集团公司第八研究所) | Quantum optical device space hybrid integrated assembly |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2018076831A1 (en) | Unequal-arm interference ring and quantum key distribution system | |
| CN106850217A (en) | One kind realizes one-dimensional modulation continuous variable quantum key delivering method | |
| CN110324145A (en) | It is a kind of to polarize unrelated phase code quantum key distribution system and method | |
| EP3869758A1 (en) | Phase modulation-based qkd polarization state preparation apparatus and method | |
| CN108667519B (en) | Intensity modulation apparatus and method and application thereof in quantum key distribution system | |
| CN104020334B (en) | A kind of electro-optic phase modulator half-wave voltage measuring system and measuring method | |
| IT8967995A1 (en) | COHERENT FIBER OPTIC COMMUNICATION SYSTEM WITH DIFFERENT POLARIZATION IN TRANSMISSION | |
| CN113872701B (en) | Time phase coding device and quantum key distribution system | |
| CN103475425A (en) | Single photon source based on Faraday-Sagnac loop and realization method thereof | |
| CN208707653U (en) | CVQKD sending device and system based on self-stabilization intensity modulated | |
| CN210041849U (en) | Polarization-independent phase coding quantum key distribution system | |
| CN114579082B (en) | Quantum random number generator based on laser phase noise | |
| CN110319828A (en) | A kind of the resonance type optical fiber gyro system and its signal detecting method of bicyclic cavity configuration | |
| CN110224819A (en) | A kind of on piece decoder and coding/decoding method for time BB84 agreement | |
| CN105305223A (en) | Brillouin dynamic grating generation apparatus and method | |
| JPS6387032A (en) | Light signal beam detector | |
| CN110635895B (en) | CVQKD (constant velocity quantum key distribution) sending device and method based on self-stabilization intensity modulation and CVQKD system | |
| CN208768104U (en) | Based on phase-modulation QKD polarization state preparation facilities | |
| CN102662250B (en) | Light intensity equalizer | |
| CN206865468U (en) | The intensity modulated device and quantum key distribution system of a kind of self-stabilization | |
| CN201550128U (en) | Real time compensation phase differential interference device | |
| CN206515569U (en) | Laser pulse shaping device and shaping for laser pulse system | |
| CN110752884B (en) | Reciprocal Gaussian modulation quantum optical signal generation device and method | |
| CN208386565U (en) | A kind of improved HD-QKD system and receiving end | |
| CN217135505U (en) | Plug-and-play type sagnac loop reference system independent measuring equipment independent QKD system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190405 Effective date of abandoning: 20230113 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190405 Effective date of abandoning: 20230113 |