CN209088963U - A kind of driving device for Distributed Feedback Laser in quantum key distribution - Google Patents
A kind of driving device for Distributed Feedback Laser in quantum key distribution Download PDFInfo
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- CN209088963U CN209088963U CN201822218132.8U CN201822218132U CN209088963U CN 209088963 U CN209088963 U CN 209088963U CN 201822218132 U CN201822218132 U CN 201822218132U CN 209088963 U CN209088963 U CN 209088963U
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Abstract
The utility model discloses a kind of driving devices for Distributed Feedback Laser in quantum key distribution, including controller, two burst pulse molding machines and digital regulating device, the burst pulse molding machine and digital regulating device are integrated on a single die, the controller is connected to two burst pulse molding machines and digital regulating device, digital regulating device connects two burst pulse molding machines, signal output end of the output end of two burst pulse molding machines as driving device.The utility model has the advantage that the volume for substantially reducing modular integrated, chip, miniaturization and realizing identical function module compared with prior art, reduces the volume and weight of integral body.
Description
Technical field
The utility model relates to quantum key distribution technical fields, more specifically, being that one kind is related in quantum key point
The device of Distributed Feedback Laser is driven in (QKD) system of hair.
Background technique
Today's society, with the development of science and technology, the mankind come into information-intensive society.And people have the safety of information
More and more demands, deprotection is greatly to state wife and children to everyone information security.To solve the potential safety problem of information, amount
Sub- cryptography is come into being.Quantum cryptography is the encryption and decryption scheme designed using the Quantum Properties of substance, and safety is to build
It stands on quantum-mechanical basic principle.Agreement commonly used at present is to be mentioned by Bennett and Brassard in 1984
QKD scheme out, referred to as BB84 agreement.Using the BB84 agreement of ideal component, Unconditional security has been obtained strictly
Ground proves, it was demonstrated that this assumes that quantum-mechanical basic principle is correct.Although ideal BB84 agreement is with no item
Part safety, but in practical applications, since device there are various imperfections, brought to the safety of system serious
It threatens.The high loss of the multi-photon pulses as present in light source and quantum channel, which combines, easily to be utilized by attacker, and light is carried out
Subnumber separation attack.The trick state agreement proposed in response to this problem can greatly promote the performance of practical QKD system, resist latent
Listener-in's photon-number-splitting attack.Program requirement, the light pulse of signal state is with trick state light pulse except average photon number has
Outside difference, other characteristic parameters are identical.
The Distributed Feedback Laser used in QKD (Distributed Feedback Laser, i.e. distributed feedback laser)
Because needing to meet the luminous demand of state of inveigling, needs to drive it and make certain improvements, laser is enabled to send vacuum at random
State inveigles state and signal state signal.
The prior art is shown in patent ZL201310675458.2 that signal generates process as shown in Figure 1, including high speed logic control
Coremaking piece and trick state light pulse drive module, wherein inveigling state light pulse drive module includes that high-speed, true random-number expands module
With trick state electric pulse generation module.First high speed logic control chip generate 2bit true random signal, then by a high speed very with
Machine number expands module and expands generation two-way high-speed, true random-number signal, and the ratio according to trick state quantum light source embodiment is wanted
Ask be randomly generated 00,01,10 3 groups of random signals, specific ratio is according to counting statistics fluctuation optimization design.Specifically, when with
When machine ordered series of numbers is 00, PORT 1 (port 1) and the PORT 2 (port 2) that figure high speed true random number expands module is not triggered,
The output of state electric pulse generation module no signal is inveigled at this time, and respective laser diodes are also generated without light pulse, are corresponded to and are inveigled state
0 photon state in scheme；When random number series are 01, PORT 1 is triggered, inveigles state electric pulse generation module 1 to generate pulse at this time
Amplitude is the short pulse signal of V1, generates the optical signal that average light power is P1 through RF cascade driver driving laser diode,
Corresponding to the trick state inveigled in state scheme；When random number series are 10, PORT 2 is triggered, inveigles state electric pulse to generate mould at this time
Block 2 generates the short pulse signal that impulse amplitude is V2 (V2 > V1), generates average light through RF cascade driver driving laser diode
Power is the optical signal of P2 (P2=3P1), corresponding to the signal state inveigled in state scheme.The different amplitudes that random triggering generates are narrow
Pulse signal can be coupled as all the way through broadband power synthesizer as shown in the figure, then be exported after RF cascade driver amplification.
The driving device of the laser of the prior art has the following problems:
1. available circuit is designed as realizing that the signal generates process, device used is more, and circuit is complex.And it realizes
Function element modularization is larger, is placed in cabinet and needs larger space.
2. the prior art uses broadband power synthesizer, this device can only operate in particular frequency range, cannot be according to tune
Performance self-adapting processed is increased or is reduced.
3. in the prior art, final output signal is voltage signal.But because Distributed Feedback Laser is as current drive-type device
The driving current of part, high stability is the premise of stable output power, so driving laser is more stable using current signal.
4. the impulse amplitude V1 and V2 of electric pulse generation module 1 and 2 are non-adjustable, can not compensate automatically due to environment temperature etc.
The variation of output pulse amplitude V1/V2 ratio caused by factor influences to inveigle state light source ratio stability.
Utility model content
The technical problem to be solved by the utility model is to how solve the body of circuit complexity and the more generation of device
The larger problem of product.
The utility model is to solve above-mentioned technical problem by the following technical programs:
A kind of driving device for Distributed Feedback Laser in quantum key distribution, including controller, two burst pulse molding dresses
It sets and digital regulating device, the burst pulse molding machine and digital regulating device integrates the control on a single die
Device processed is connected to two burst pulse molding machines and digital regulating device, and digital regulating device connects two burst pulse molding dresses
It sets, signal output end of the output end of two burst pulse molding machines as driving device.
As first specific technical solution, which is also wrapped
Two pulsation attenuating arrangements and high speed selection switch are included, the digital regulating device includes D/A converter, and controller is connected to D/
The control terminal of A switch input and high speed selection switch, two burst pulse molding machines are declined by corresponding pulse respectively
Subtract device and be connected to the first choice end of selection switch at a high speed and the second selection end, the first output end of D/A converter connects it
In a pulsation attenuating arrangement, the second output terminal of D/A converter connects another pulsation attenuating arrangement, high speed selection switch
Third selects end ground connection, and high speed selects signal output end of the output end of switch as driving device.
As above-mentioned technical proposal to advanced optimize, this is used for the driving device of Distributed Feedback Laser in quantum key distribution
It further include V/I converter, the input terminal of the output termination V/I converter of the high speed selection switch, the output end of V/I converter
As the signal output end of driving device, Distributed Feedback Laser is connected.
As advanced optimizing for above scheme, the structure of two burst pulse molding machines is identical, including sequentially connected
High speed signal discriminator circuit, narrow-pulse generation circuit.
As advanced optimizing for above scheme, the high speed signal discriminator circuit uses hysteresis comparator chip U1, right
Difference output after the differential signal of input is screened, the positive signal and negative signal point of the output end output of the controller
It is not connected to two input terminals of hysteresis comparator chip U1, two output ends of hysteresis comparator chip U1 distinguish output cathode
Signal and negative signal.
As advanced optimizing for above scheme, the narrow-pulse generation circuit uses intelligent door chip U2, by high speed
Signal after signal screening circuit is screened is input to intelligent door chip U2, wherein the anode letter of the output of high speed signal discriminator circuit
The channel selecting SEL positive terminal of intelligent door chip U2 number is connect, the negative signal of the output of high speed signal discriminator circuit connects intelligent door
The channel the D1 electrode input end of chip U2, the channel D0 of intelligent door chip U2 is hanging, and the channel the D1 cathode of intelligent door chip U2 is defeated
Enter end and power Vcc is connect by resistance R7, channel selecting SEL negative pole end connects power Vcc by resistance R10, intelligent door chip U2's
Two output ends export burst pulse positive signal and burst pulse negative signal respectively.
As advanced optimizing for above scheme, the attenuating device is realized using VGA chip U3, VGA chip U3 input
For Differential Input, the burst pulse positive signal and burst pulse negative signal of intelligent door chip U2 output input VGA chip U3 respectively
Electrode input end and negative input, D/A converter the first output end output analog level Vctr0 input a VGA
The analog level Vctr1 of the programmable modulated terminal of chip U3, the second output terminal output of D/A converter inputs another VGA core
The programmable modulated terminal of piece U3, analog level Vctr0 control the narrow pulse signal that VGA chip U3 output pulse amplitude is P1
Sig3_P1, analog level Vctr1 control the narrow pulse signal Sig3_P2 that VGA chip U3 output pulse amplitude is P2, burst pulse
Signal Sig3_P1 and Sig3_P2 input the high speed selection switch.
As advanced optimizing for above scheme, the high speed selection switch uses channel selecting chip U4, channel selecting
Control signal D1, D0 that the control signal input difference input controller of chip U4 issues, the signal of channel selecting chip U4
Input terminal inputs narrow pulse signal Sig3_P1 and Sig3_P2 respectively, by controlling the control of signal D1, D0, channel selecting chip
U4 randomly chooses three kinds of impulse amplitudes and exports as voltage narrow pulse signal Sig4.
As second specific technical solution, this is used for the driving device of Distributed Feedback Laser in quantum key distribution, special
Sign is, further includes that the first bias current adjusts circuit, the second bias current adjusts circuit, the first V/I converter and the 2nd V/I
Converter, the digital regulating device include D/A converter, and the controller output end is separately connected two burst pulse molding dresses
The input terminal and D/A converter input terminal set, the output end of two burst pulse molding machines be separately connected the first V/I converter and
Signal output end of the output end of 2nd V/I converter, the first V/I converter and the 2nd V/I converter as driving device, even
Distributed Feedback Laser is connect, the first output end of D/A converter connects the input terminal that the first bias current adjusts circuit, D/A converter
Second output terminal connects the input terminal that the second bias current adjusts circuit, and the first bias current adjusts the output end connection the of circuit
One V/I converter, the output end that the second bias current adjusts circuit connect the 2nd V/I converter.
As advanced optimizing for above-mentioned second technical solution, the first burst pulse molding machine and the molding of the second burst pulse
Apparatus structure is identical, includes sequentially connected high speed signal discriminator circuit and narrow-pulse generation circuit.
As advanced optimizing for above-mentioned second technical solution, the high speed signal discriminator circuit uses hysteresis comparator
Chip U1, difference output after being screened to the differential signal of input, the controller output end output positive signal and
Negative signal is connected respectively to two input terminals of hysteresis comparator chip U1, two output ends point of hysteresis comparator chip U1
Other output cathode signal and negative signal.
As advanced optimizing for above-mentioned second technical solution, the narrow-pulse generation circuit uses intelligent door chip
U2, the signal after the examination of high speed signal discriminator circuit are input to intelligent door chip U2, wherein high speed signal discriminator circuit
The positive signal of output connects the channel selecting SEL positive terminal of intelligent door chip U2, the cathode of the output of high speed signal discriminator circuit
Signal connects the channel the D1 electrode input end of intelligent door chip U2, and the channel D0 of intelligent door chip U2 is hanging, intelligent door chip U2's
The channel D1 negative input connects power Vcc by resistance R7, and channel selecting SEL negative pole end connects power Vcc, intelligence by resistance R10
Two output ends of energy door chip U2 export burst pulse positive signal and burst pulse negative signal respectively.
In above-mentioned two technical solution, the third output end of the D/A converter connects voltage-controlled current source, voltage-controlled current source
DC bias current output end of the output end as driving device, connect Distributed Feedback Laser.
In above-mentioned two technical solution, the V/I converter and voltage-controlled current source are connected to the negative of the LD of Distributed Feedback Laser
The anode of pole, LD connects signal ground.
In above-mentioned two technical solution, the controller is FPGA.
The utility model has the advantage that compared with prior art
1. this programme by modular integrated, chip, miniaturization, substantially reduces the volume for realizing identical function module.
The volume and weight of integral body can be reduced.
2. directly controlling output electric current with controller using the structure of this programme, it can control and generate homologous clock and make
It is standby to represent the burst pulse for inveigling state P2 and signal state P1.High speed selection switch is directly controlled simultaneously to switch output signal at random
State inveigles state and vacuum state.High speed selection switchs the frequency range of unlimited work, more than broadband power synthesizer working frequency
Width adaptively can be increased or be reduced according to modulating performance.
3. this programme output signal is current signal, Distributed Feedback Laser is made as current drive-type device using driving current
It is more stable to obtain Distributed Feedback Laser output power.
4. the impulse amplitude of narrow pulse signal P1 and P2 can be adjusted by D/A, can compensate automatically due to environment temperature etc. because
The variation of output pulse amplitude caused by element guarantees the luminous function of signal state and trick state in quantum key distribution light source encoding scheme
Rate ratio is stablized.
Detailed description of the invention
Fig. 1 is to inveigle state light source drive signal to generate process schematic in the prior art；
Fig. 2 is the structure chart of the Distributed Feedback Laser driving device of the utility model embodiment one；
Fig. 3 is burst pulse molding and attenuating device in the Distributed Feedback Laser driving device of the utility model embodiment one
The schematic diagram of structure；
Fig. 4 is the high speed signal discriminator circuit figure in the burst pulse molding and attenuating device of the utility model embodiment one；
Fig. 5 is the narrow-pulse generation circuit figure in the burst pulse molding and attenuating device of the utility model embodiment one；
Fig. 6 is the narrow pulse signal width control principle drawing of the utility model embodiment one；
Fig. 7 is the attenuating device circuit diagram in the burst pulse molding and attenuating device of the utility model embodiment one；
Fig. 8 is the high speed selected on-off circuit figure of the utility model embodiment one；
Fig. 9 is the driving device of the Distributed Feedback Laser of the utility model embodiment one and the specific connection relationship of Distributed Feedback Laser
Figure；
Figure 10 is the structure chart of the Distributed Feedback Laser driving device of the utility model embodiment two.
Specific embodiment
It elaborates below to the embodiments of the present invention, the present embodiment before being with technical solutions of the utility model
It puts and is implemented, the detailed implementation method and specific operation process are given, but the protection scope of the utility model is unlimited
In following embodiments.
In the description of the present application, it is to be understood that term " first ", " second " are used for description purposes only, and cannot
It is interpreted as indication or suggestion relative importance or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include one or more of the features.In the description of the present application,
The meaning of " plurality " is two or more, unless otherwise specifically defined.
In this application unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc.
Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integral；It can be mechanical connect
It connects, is also possible to be electrically connected, can also be communication；It can be directly connected, can also indirectly connected through an intermediary, it can be with
It is the interaction relationship of the connection or two elements inside two elements.For the ordinary skill in the art, may be used
To understand the concrete meaning of above-mentioned term in this application as the case may be.
Embodiment one
As shown in Fig. 2, the driving device packet for Distributed Feedback Laser in quantum key distribution of the utility model embodiment one
It includes FPGA (Field-Programmable Gate Array, i.e. field programmable gate array), the molding of the first burst pulse and declines
Subtract device, the molding of the second burst pulse and attenuating device, high speed selection switch, D/A (D/A) converter, V/I (voltage/current)
Converter, voltage-controlled current source.
The FPGA output end is separately connected the input terminal of the molding of the first burst pulse and attenuating device, the molding of the second burst pulse
The control terminal switched with the input terminal, D/A converter input terminal and high speed selection of attenuating device.First burst pulse is formed and is declined
Subtract the output end of device, the second burst pulse forms and the output end of attenuating device is connected respectively to the first of high speed selection switch and selects
End and the second selection end, the third selection end ground connection of high speed selection switch are selected, the output of high speed selection switch terminates V/I converter
Input terminal, the output end of V/I converter connects Distributed Feedback Laser.First output end of D/A converter connect the first burst pulse at
Type and attenuating device, the second output terminal of D/A converter connect the molding of the second burst pulse and attenuating device, and the of D/A converter
Three output ends connect voltage-controlled current source, and the output end of voltage-controlled current source connects Distributed Feedback Laser.
The FPGA exports three classes signal: the first kind is the homologous clock signal of two-way, is two-way modulated pulse signal, two-way
Phase between modulated pulse signal is fixed, and is staggered on the time, is copied into after can directly exporting signal all the way herein by device inside
Two-way, the method that can also directly export the two paths of signals output provided in two paths of signals, such as Fig. 2；Second class is that high speed selects
Switch control signal, third class are the control signals of D/A converter.
The homologous clock signal of the two-way of the first kind is formed through the molding of the first burst pulse and attenuating device, the second burst pulse respectively
After attenuating device modulation, narrow pulse signal P1, P2 are exported respectively.
The high speed of second class selects switch control signal, is the Data selection signal exported by FPGA, for controlling high speed
The channel switching of selection switch, Data selection signal and first kind clock signal are homologous, are switched by channel, high speed selection switch
Random switching exports the pulse signal of tri- kinds of 0, P1, P2 different amplitudes.
The pulse signal of high speed selection switch output becomes output voltage via V/I converter to export electric current again
Ipulse, pulsed drive current of this electric current as Distributed Feedback Laser.
The control signal of the D/A converter of third class is DC offset voltage signal, burst pulse electric pulse letter after molding
Number need by FPGA control D/A converter channel to signal carry out adjustable attenuation.The wherein Amplitude Ratio of narrow pulse signal P1 and P2
Example is controlled the analog level Vctr0 and second output terminal of the first output end output of D/A converter according to encoding scheme by FPGA
The analog level Vctr1 of output carries out flexible modulation, to meet signal state and state preparation is inveigled to require.In addition FPGA passes through control
It is inclined that the DC offset voltage signal Vbias of the third output end output of D/A converter becomes stable DC after voltage-controlled current source
Electric current Ibias is set, prebias electric current of this electric current as Distributed Feedback Laser, and it is adjustable.
Specific work process: FPGA export the homologous clock signal of two-way, this signal pass through respectively the first burst pulse molding and
After attenuating device, the molding of the second burst pulse and attenuating device, the molding of the first burst pulse and attenuating device generate narrow pulse signal P1,
The corresponding signal state inveigled in state scheme, the molding of the second burst pulse and attenuating device generate narrow pulse signal P2, corresponding to inveigle state
The ratio of trick state in scheme, narrow pulse signal P1 and P2 can carry out any setting as needed.High speed selection in Fig. 2 is opened
Close the random Data signal control (such as 2bit random digital signal) issued by FPGA.According to trick state quantum light source embodiment party
Case, when needing output signal state, Data signal control high speed selection switching exports narrow pulse signal to first choice end
P1；When needing to export trick state, Data signal control high speed selection switching to the second selection end, output narrow pulse signal
P2；When needing to export vacuum state, Data signal control high speed selection switching selects end to third, exports spacing wave.With
The signal of machine selection output, which is directly over V/I converter and is converted into current signal Ipulse, is connected to laser drive current interface,
Vacuum state, signal state can be realized and inveigle state signal code pulse Stochastic Modulation function.
The driving current interface for the driving device connection Distributed Feedback Laser of Distributed Feedback Laser in quantum key distribution
Afterwards, the light pulse that Distributed Feedback Laser issues prepares the quantum light source of required quantum state using modulation and decaying.
Using the driving device of the Distributed Feedback Laser of the present embodiment, because the molding of the first burst pulse and attenuating device, second narrow
Pulse-shaping and attenuating device, high speed selection switch, D/A converter, V/I converter, voltage-controlled current source are integrated in a chip
On, it is achieved that it is circuit chip, modular integrated, substantially reduce device volume.This programme simplify circuit while,
It is steady in device performance consistency, parameter accordingly, with respect to discrete device mode because being to be based on IC chip integrated solution
Qualitative, device power consumption is small etc. to embody reliability, is more conducive to industrialized production.
With further reference to Fig. 3, the first burst pulse molding and attenuating device and the molding of the second burst pulse and attenuating device
Structure is identical, is illustrated with the structure of the molding of the first burst pulse and attenuating device, the first burst pulse molding and decaying dress
It sets including sequentially connected high speed signal discriminator circuit, narrow-pulse generation circuit and attenuator circuit.
In more detail, referring to fig. 4, the high speed signal discriminator circuit uses hysteresis comparator chip U1, to the difference of input
Difference output after sub-signal is screened, hysteresis comparator chip U1 have 4 input terminals, 2 output ends, the output end of the FPGA
The positive signal Sig_P of output is connected to the end VP of hysteresis comparator chip U1, the cathode letter of the output end output of the FPGA
Number Sig_N is connected to the end VT of hysteresis comparator chip U1, and the VTP of hysteresis comparator chip U1 terminates reference voltage Va, sluggish
The VTN of comparator chip U1 terminates reference voltage Vb, the end VP of hysteresis comparator chip U1 and the end VTP indirect matching resistance R1,
The end VT of hysteresis comparator chip U1 and the end VTN indirect matching resistance R2.The ground terminal of hysteresis comparator chip U1 passes through resistance
Distinguish output cathode signal Sig1_P and negative signal Sig1_ in the end OUT_P and OUT_N of R3 ground connection, hysteresis comparator chip U1
N。
As shown in figure 5, the narrow-pulse generation circuit uses intelligent door chip U2, screened by high speed signal discriminator circuit
Signal afterwards is input to U2, and wherein the positive signal Sig1_P of the output of high speed signal discriminator circuit connects the logical of intelligent door chip U2
Road selects SEL positive terminal, and the negative signal Sig1_N of the output of high speed signal discriminator circuit connects the channel D1 of intelligent door chip U2
The channel D0 of electrode input end, intelligent door chip U2 is hanging, and the channel the D1 negative input of intelligent door chip U2 passes through resistance R7
Power Vcc is connect, channel selecting SEL negative pole end connects power Vcc by resistance R10.The end OUT_P and OUT_N of intelligent door chip U2
Burst pulse positive signal Sig2_P and burst pulse negative signal Sig2_N is exported respectively.
The control of narrow pulse signal width is as shown in fig. 6, reach narrow arteries and veins by the output end of control high speed signal discriminator circuit
The length of arrangement wire of the input terminal of generation circuit is rushed, so that the positive signal Sig1_P of high speed signal discriminator circuit output and cathode letter
Number Sig1_N generates the delay of τ, passes through and realizes burst pulse output after intelligent door chip U2 is exported.
As shown in fig. 7, the attenuating device is realized using VGA chip U3, VGA chip U3 input is Differential Input, intelligence
The burst pulse positive signal Sig2_P and burst pulse negative signal Sig2_N of door chip U2 output are inputting VGA chip U3 just respectively
Pole input terminal and negative input, the analog level Vctr0 input VGA chip U3's of the first output end output of D/A converter
Programmable modulated terminal, it is similar, the analog level Vctr1 of the second output terminal output of D/A converter input the second burst pulse at
The programmable modulated terminal of VGA chip U3 in type and attenuating device, analog level Vctr0 control VGA chip U3 and export pulse width
Value is the narrow pulse signal Sig3_P1 of P1, likewise, analog level Vctr1 control VGA chip U3 output pulse amplitude is P2's
Narrow pulse signal Sig3_P2, the narrow pulse signal that the narrow pulse signal Sig3_P1 and pulse amplitude that pulse amplitude is P1 are P2
Sig3_P2 inputs the high speed selection switch.
Refering to Fig. 8, the Data signal that the FPGA is issued is set as control signal D1, D0, and the high speed selection switch uses
The control signal input of channel selecting chip U4, channel selecting chip U4 distinguish input control signal D1, D0, channel selecting core
The signal input part of piece U4 inputs narrow pulse signal Sig3_P1 and Sig3_P2 respectively, by controlling the control of signal D1, D0, leads to
Road selects the output voltage narrow pulse signal Sig4 of chip U4 to randomly choose three kinds of impulse amplitudes: P1, P2 and 0 output.
The specific connection of the driving device of Distributed Feedback Laser and Distributed Feedback Laser is as shown in figure 9, the V/I converter and voltage-controlled
Current source is radio frequency triode, and wherein the voltage narrow pulse signal Vpulse that prime exports is converted to current, narrow by V/I converter
Pulse Ipulse, width τ.The DC offset voltage signal that voltage-controlled current source exports the third output end of D/A converter
Vbias is converted to corresponding quiescent bias current Ibias.In view of the shell of most of butterflies encapsulation Distributed Feedback Laser is connected to
The anode of LD, biasing/driving signal are connected to the cathode of LD, GND are usually connected to LD anode when actual product designs, therefore
V/I converter and voltage-controlled current source should be placed on the downside of LD, realize sucking current work.The driving device of Distributed Feedback Laser is defeated
Short duration current Ipulse out is connected by the cathode of the current impulse interface of Distributed Feedback Laser and the LD of Distributed Feedback Laser, LD's
Anode connects signal ground, and short duration current drives LD to shine.In addition, the DC bias current that the driving device of Distributed Feedback Laser exports
The cathode of the LD of Ibias and Distributed Feedback Laser connects, and provides bias current for LD, sucks electric current from LD.
Embodiment two
As shown in Figure 10, the driving device for Distributed Feedback Laser in quantum key distribution of the utility model embodiment two
Including FPGA (Field-Programmable Gate Array, i.e. field programmable gate array), the first burst pulse molding dress
It sets, the second burst pulse molding machine, the first V/I (voltage/current) converter, the 2nd V/I (voltage/current) converter, D/A
(D/A) converter, the first bias current adjust circuit, the second bias current adjusts circuit, voltage-controlled current source.
The FPGA output end is separately connected the input terminal of the first burst pulse molding machine, the second burst pulse molding machine
Input terminal, D/A converter input terminal.The output end of first burst pulse molding machine connects the first V/I converter, the second burst pulse
The output end of molding machine connects the 2nd V/I converter, the output end connection DFB of the first V/I converter and the 2nd V/I converter
Laser.The input terminal of the first output end connection the first bias current adjusting circuit of D/A converter, the second of D/A converter
Output end connects the input terminal that the second bias current adjusts circuit, and the output end that the first bias current adjusts circuit connects the first V/
I converter, the output end that the second bias current adjusts circuit connect the 2nd V/I converter.The third output end of D/A converter connects
Voltage-controlled current source is connect, the output end of voltage-controlled current source connects Distributed Feedback Laser.
The FPGA exports two class signals: the first kind is the homologous clock signal of two-way, is two-way modulated pulse signal, two-way
Homologous clock signal is provided by FPGA timesharing；Second class is the control signal of D/A converter.
The homologous clock signal of the two-way of the first kind is respectively through the first burst pulse molding machine and the second burst pulse molding machine
After obtain two-way narrow pulse signal.First V/I converter and the 2nd V/I converter are respectively by corresponding narrow pulse signal by voltage
Signal is converted into current signal, is adjusted with being convenient to do the size of current of next step.
Control signal by the D/A converter of the second class of FPGA output is DC offset voltage signal, the D/A of the second class
The control signal of converter is exported by the first, second, third output port of D/A converter respectively after D/A converter.D/A
Converter the first output end output analog signal by the first bias current adjust circuit after to defeated through the first V/I converter
Current signal size out is adjusted, and final output current signal P1, the simulation letter of the second output terminal output of D/A converter
Number by the second bias current adjust circuit after current signal size export through the 2nd V/I converter is adjusted, and finally
Output current signal P2, wherein signal state P1 and inveigle state P2 luminous power ratio are as follows: P1:P2=3 or P2:P1=3, signal
The luminous power ratio of state and trick state can carry out any setting as needed, i.e. generation signal state and trick state and vacuum state can
Flexible modulation is carried out by the first output end of FPGA control D/A converter and the analog level of second output terminal output at random.Electricity
Signal P1, P2,0 are flowed by the random Time-sharing control output of PFGA, i.e. signal state, trick state, the random timesharing of vacuum state exports to form electricity
Flow Ipulse, pulsed drive current of this electric current as Distributed Feedback Laser.The simulation letter of the third output end output of D/A converter
Number become DC bias current Ibias after voltage-controlled current source, prebias electricity of this bias current Ibias as Distributed Feedback Laser
Stream, and it is adjustable.To sum up, pulsed drive current Ipulse and bias current Ibias is adjusted by D/A converter in FPGA.
Specific work process: FPGA timesharing exports two-way modulated pulse signal, and two-way modulated pulse signal passes through pair respectively
Narrow pulse signal is generated after the first burst pulse molding machine and the second burst pulse molding machine answered, then via corresponding first V/
I converter and the 2nd V/I converter change into current signal.At the same time, it is passed through by the another way DC offset voltage of FPGA output
It is exported respectively by the first, second and third output end of D/A converter after D/A converter.The analog signal of first and second output end output
Circuit and the second bias current are adjusted by the first bias current respectively and adjust circuit, respectively to through the first V/I converter and the
The pulsed current signal size of two V/I converters output is adjusted.FPGA is divided according to coding rule by specific clock probability at random
When drive two-way pulse current P1 and P2, cooperation two-way bias current is adjusted, and output signal state inveigles state or 0 (vacuum state)
Signal Ipulse.Cooperate through DC bias current Ibias, after driving Distributed Feedback Laser, vacuum state, signal state can be realized and lure
Deceive the function of state laser Stochastic Modulation.
The driving current interface for the driving device connection Distributed Feedback Laser of Distributed Feedback Laser in quantum key distribution
Afterwards, the light pulse that Distributed Feedback Laser issues prepares the quantum light source of required quantum state using modulation and decaying.
Using the driving device of the Distributed Feedback Laser of the present embodiment, circuit chip, modular integrated is realized, is subtracted significantly
Small device volume.This programme also improves device reliability, is more conducive to industrialized production while simplifying circuit.
The first burst pulse molding machine and the second burst pulse forming device structure in the embodiment is identical, including successively connects
High speed signal discriminator circuit, the narrow-pulse generation circuit connect, wherein the high speed signal discriminator circuit, narrow-pulse generation circuit are all
It can be using the circuit in embodiment one.
The first V/I converter and the 2nd V/I converter in the embodiment can equally be turned using the V/I in embodiment one
The structure of parallel operation.
Voltage-controlled current source in the embodiment can be using the structure of the voltage-controlled current source in embodiment one.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (14)
1. a kind of driving device for Distributed Feedback Laser in quantum key distribution, which is characterized in that including controller, two narrow
Pulse-shaping device and digital regulating device, the burst pulse molding machine and digital regulating device are integrated in a chip
On, the controller is connected to two burst pulse molding machines and digital regulating device, and digital regulating device connection is two narrow
Pulse-shaping device, signal output end of the output end of two burst pulse molding machines as driving device.
2. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 1, feature exist
In, further include two pulsation attenuating arrangements and high speed selection switch, the digital regulating device includes D/A converter, controller
It is connected to the control terminal of D/A converter input terminal and high speed selection switch, two burst pulse molding machines pass through correspondence respectively
Pulsation attenuating arrangement be connected to high speed selection switch first choice end and second selection end, D/A converter first output
End connects one of pulsation attenuating arrangement, and the second output terminal of D/A converter connects another pulsation attenuating arrangement, and high speed is selected
The third selection end ground connection of switch is selected, high speed selects signal output end of the output end of switch as driving device.
3. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 2, feature exist
In, further include V/I converter, the input terminal of the output termination V/I converter of high speed selection switch, V/I converter it is defeated
Signal output end of the outlet as driving device connects Distributed Feedback Laser.
4. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 2, feature exist
In the structure of two burst pulse molding machines is identical, including sequentially connected high speed signal discriminator circuit, burst pulse generate electricity
Road.
5. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 4, feature exist
In the high speed signal discriminator circuit uses hysteresis comparator chip U1, the positive signal of the output end output of the controller
Two input terminals of hysteresis comparator chip U1, two output ends of hysteresis comparator chip U1 are connected respectively to negative signal
Output cathode signal and negative signal respectively.
6. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 5, feature exist
In the narrow-pulse generation circuit uses intelligent door chip U2, and the signal after the examination of high speed signal discriminator circuit is input to
Intelligent door chip U2, wherein the positive signal of the output of high speed signal discriminator circuit meets the channel selecting SEL of intelligent door chip U2
Positive terminal, the negative signal of the output of high speed signal discriminator circuit connect the channel the D1 electrode input end of intelligent door chip U2, intelligence
The channel D0 of door chip U2 is hanging, and the channel the D1 negative input of intelligent door chip U2 connects power Vcc, channel choosing by resistance R7
It selects SEL negative pole end and power Vcc is connect by resistance R10, two output ends of intelligent door chip U2 export burst pulse anode letter respectively
Number and burst pulse negative signal.
7. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 6, feature exist
In the attenuating device is realized using VGA chip U3, and VGA chip U3 input is Differential Input, and intelligent door chip U2 is exported narrow
Pulse positive signal and burst pulse negative signal input the electrode input end and negative input of VGA chip U3, D/A conversion respectively
The analog level Vctr0 of the first output end output of device inputs the programmable modulated terminal of a VGA chip U3, D/A converter
The analog level Vctr1 of second output terminal output inputs the programmable modulated terminal of another VGA chip U3, two VGA chip U3
The narrow pulse signal Sig3_P1 and Sig3_P2 of output end output input high speed selection switch.
8. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 7, feature exist
In the high speed selection switch uses channel selecting chip U4, and the control signal input of channel selecting chip U4 inputs respectively
Control signal D1, D0 that controller issues, the signal input part of channel selecting chip U4 input narrow pulse signal Sig3_P1 respectively
And Sig3_P2, channel selecting chip U4 output voltage narrow pulse signal Sig4.
9. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 1, feature exist
In further including that the first bias current adjusts circuit, the second bias current adjusts circuit, the first V/I converter and the 2nd V/I turn
Parallel operation, the digital regulating device include D/A converter, and the controller output end is separately connected two burst pulse molding machines
Input terminal and D/A converter input terminal, the output end of two burst pulse molding machines is separately connected the first V/I converter and
Signal output end of the output end of two V/I converters, the first V/I converter and the 2nd V/I converter as driving device, connection
Distributed Feedback Laser, the first output end of D/A converter connect the input terminal that the first bias current adjusts circuit, and the of D/A converter
Two output ends connect the input terminal that the second bias current adjusts circuit, and the first bias current adjusts the output end connection first of circuit
V/I converter, the output end that the second bias current adjusts circuit connect the 2nd V/I converter.
10. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 9, feature exist
In the first burst pulse molding machine and the second burst pulse forming device structure are identical, include that sequentially connected high speed signal is discriminated
Other circuit and narrow-pulse generation circuit.
11. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 10, feature exist
In the high speed signal discriminator circuit uses hysteresis comparator chip U1, the positive signal of the output end output of the controller
Two input terminals of hysteresis comparator chip U1, two output ends of hysteresis comparator chip U1 are connected respectively to negative signal
Output cathode signal and negative signal respectively.
12. a kind of driving device for Distributed Feedback Laser in quantum key distribution according to claim 11, feature exist
In the narrow-pulse generation circuit uses intelligent door chip U2, and the signal after the examination of high speed signal discriminator circuit is input to
Intelligent door chip U2, wherein the positive signal of the output of high speed signal discriminator circuit meets the channel selecting SEL of intelligent door chip U2
Positive terminal, the negative signal of the output of high speed signal discriminator circuit connect the channel the D1 electrode input end of intelligent door chip U2, intelligence
The channel D0 of door chip U2 is hanging, and the channel the D1 negative input of intelligent door chip U2 connects power Vcc, channel choosing by resistance R7
It selects SEL negative pole end and power Vcc is connect by resistance R10, two output ends of intelligent door chip U2 export burst pulse anode letter respectively
Number and burst pulse negative signal.
13. according to a kind of described in any item driving dresses for Distributed Feedback Laser in quantum key distribution of claim 2 to 12
It sets, which is characterized in that the third output end of the D/A converter connects voltage-controlled current source, the output end conduct of voltage-controlled current source
The DC bias current output end of driving device connects Distributed Feedback Laser.
14. according to claim 1 to a kind of 12 described in any item driving dresses for Distributed Feedback Laser in quantum key distribution
It sets, which is characterized in that the controller is FPGA.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110347082A (en) * | 2019-07-12 | 2019-10-18 | 中国科学院上海微系统与信息技术研究所 | A kind of driving circuit, driving method and micro reflector array |
| CN112217575A (en) * | 2019-07-12 | 2021-01-12 | 科大国盾量子技术股份有限公司 | Method and system for calibrating light intensity ratio of decoy state optical signal and signal state optical signal |
| CN114088154A (en) * | 2020-07-03 | 2022-02-25 | 成都秦川物联网科技股份有限公司 | Photoelectric encoder for intelligent gas meter of Internet of things |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110347082A (en) * | 2019-07-12 | 2019-10-18 | 中国科学院上海微系统与信息技术研究所 | A kind of driving circuit, driving method and micro reflector array |
| CN112217575A (en) * | 2019-07-12 | 2021-01-12 | 科大国盾量子技术股份有限公司 | Method and system for calibrating light intensity ratio of decoy state optical signal and signal state optical signal |
| CN110347082B (en) * | 2019-07-12 | 2021-07-27 | 中国科学院上海微系统与信息技术研究所 | Driving circuit, driving method and micro-mirror array |
| CN112217575B (en) * | 2019-07-12 | 2022-02-11 | 科大国盾量子技术股份有限公司 | Method and system for calibrating light intensity ratio of decoy state optical signal and signal state optical signal |
| CN114088154A (en) * | 2020-07-03 | 2022-02-25 | 成都秦川物联网科技股份有限公司 | Photoelectric encoder for intelligent gas meter of Internet of things |
| CN114088154B (en) * | 2020-07-03 | 2023-05-26 | 成都秦川物联网科技股份有限公司 | Photoelectric encoder for intelligent gas meter of Internet of things |
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