CN209218096U - Weak coherent light source device and quantum key distribution system - Google Patents
Weak coherent light source device and quantum key distribution system Download PDFInfo
- Publication number
- CN209218096U CN209218096U CN201822151294.4U CN201822151294U CN209218096U CN 209218096 U CN209218096 U CN 209218096U CN 201822151294 U CN201822151294 U CN 201822151294U CN 209218096 U CN209218096 U CN 209218096U
- Authority
- CN
- China
- Prior art keywords
- signal
- circuit
- light source
- coherent light
- control
- 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- Withdrawn - After Issue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
- Semiconductor Lasers (AREA)
Abstract
The utility model discloses a kind of weak coherent light source device and QKD systems, and technical solutions of the utility model are using light source control chip controls burst pulse generation module and control detection circuit, to control the coherent light signal of laser transmitting setting.The coherent light signal is divided into first via optical signal and the second road optical signal by beam splitter, the light-intensity test result of first via optical signal can be detected based on photodiode and conversion circuit, it controls adjustable optical attenuator and attenuation processing is carried out to second road optical signal, form the weak coherent light signal for being used for quantum communications.And the weak coherent light source device can a part based on coherent light signal adjustable attenuation is carried out to another part, light channel structure is simple, it is easy to accomplish control.
Description
Technical field
The utility model relates to optical communication apparatus technical fields, more specifically, be related to a kind of weak coherent light source device with
And quantum key distribution system.
Background technique
Quantum key distribution (Quantum Key Distribution, QKD) technology can generate between communicating pair
The key of completely the same unconditional security thus receives significant attention.Quantum key distribution and classic key system are not
With its carrier for using single photon or entangled photon pairs as key is, by quantum-mechanical three big basic principle (Hai Sen
Fort uncertainty principle, measurement are collapsed theoretical, the unclonable law of quantum) ensure that can not the eavesdropping of the process, can not the property decoded,
To provide a kind of safer key code system.
Since BB84 scheme in 1984 proposes, the various theoretical schemes about quantum key distribution technology are complete day by day
Kind, technology realization graduallys mature, so that the quantum communication system based on quantum key distribution technology and quantum communications method are walked
To practical application.
In QKD system, single-photon source is the key device of QKD system, due to the limitation of current technical conditions, temporarily without
Method obtains accurate single-photon source.Therefore, in QKD engineer application system, weak coherent light source is generallyd use to substitute single photon
Source.In general, light supply apparatus conventional in QKD system is that decay to average photon number using coherent source weak relevant less than 1
Light source replaces single-photon source.
Utility model content
Technical solutions of the utility model provide a kind of weak coherent light source device and QKD system, laser can be sent out
The coherent light signal penetrated decays to weak coherent light signal, realizes quantum communications for QKD system.
To achieve the goals above, the utility model provides the following technical solutions:
A kind of weak coherent light source device, the weak coherent light source device include:
Burst pulse generation module, laser, light source control chip, control detection circuit, beam splitter, conversion circuit, photoelectricity
Diode and adjustable optical attenuator；
The burst pulse generation module is for controlling the laser transmitting burst pulse coherent light signal；
The beam splitter is used to the coherent light signal being divided into first via optical signal and the second road optical signal；
The photodiode is used to the first via optical signal being converted to current signal；
The conversion circuit is used to the current signal being converted to voltage signal；
The adjustable optical attenuator is used to carry out attenuation processing to second road optical signal, forms weak coherent light signal；
The control detection circuit is used to detect the operating temperature and working condition of the laser, generates detection letter
Number；
The control detection circuit is used to adjust the operating temperature and working condition of the laser；
The light source control chip is for obtaining the voltage signal and the detection signal.
Preferably, in above-mentioned weak coherent light source device, the light source control chip is for generating control signal, the control
Signal processed includes clock signal and data-signal；
The burst pulse generation module is based on input signal and the control signal controls the laser transmitting and is concerned with
Optical signal, the input signal include inveigling state electric signal, signal state electric signal.
Preferably, in above-mentioned weak coherent light source device, the burst pulse generation module includes:
First high-speed pulse discriminator circuit, for obtaining the input signal；The first high-speed pulse discriminator circuit according to
A secondary input terminal for passing through the first high-speed narrow pulse generation circuit and the first amplitude regulating circuit and high speed alternator driven coupling circuit
Connection；
Second high-speed pulse discriminator circuit, for obtaining the input signal；The second high-speed pulse discriminator circuit according to
Another secondary for passing through the second high-speed narrow pulse generation circuit and the second amplitude regulating circuit and the high speed alternator driven coupling circuit
Input terminal connection；
Amplitude and bias control circuit, for obtaining the control signal；The amplitude and bias control circuit have three
A output port, two output ports are connect with first amplitude regulating circuit and the second amplitude regulating circuit respectively, separately
One output port is used to provide bias control signal for the laser；
The high speed alternator driven coupling circuit are used to provide the electric drive signal of coherent light burst pulse for the laser.
Preferably, in above-mentioned weak coherent light source device, the first high-speed pulse discriminator circuit and second high speed
Pulse discriminator circuit is integrated circuit high speed hysteresis comparator bare chip；
The first high-speed narrow pulse generation circuit and the second high-speed narrow pulse generation circuit are that binary channels is integrated
Circuit high-speed-differential logic gate bare chip；
First amplitude regulating circuit and second amplitude regulating circuit are radio frequency triode bare chip；
The amplitude and bias control circuit are integrated circuit analog-digital converter bare chip；
The high speed alternator driven coupling circuit are the capacitor that capacity is equal to preset value.
Preferably, in above-mentioned weak coherent light source device, in the burst pulse generation module, the integrated circuit high speed is slow
Stagnant comparator bare chip, the binary channels integrated circuit high-speed-differential logic gate bare chip, the radio frequency triode bare chip, with
And the integrated circuit analog-digital converter bare chip is bundled on same ceramic substrate, is encapsulated in the same shell.
Preferably, in above-mentioned weak coherent light source device, the binary channels integrated circuit high-speed-differential logic gate bare chip
In, channel selecting electrode input end is connected to power supply by capacitor, so that the generation of its burst pulse is prolonged based on capacitor charge and discharge
Shi Shixian.
Preferably, in above-mentioned weak coherent light source device, the integrated circuit high speed hysteresis comparator bare chip has two
A input terminal and ground terminal；
Described two input terminals are used to obtain the signal state electric signal and the trick state electric signal of Differential Input；Institute
It states and is connected with first resistor between two input terminals, the first resistor is for matching high speed hysteresis comparator input impedance；Institute
It states ground terminal to be grounded by second resistance, the second resistance is for adjusting sluggish comparative level.
Preferably, in above-mentioned weak coherent light source device, the light source control chip includes:
Embeded processor, flash memory and the interface being connect respectively with AXI data/address bus；The embeded processor is used for
Data processing is carried out, the burst pulse generation module, the control detection circuit and described are controlled based on data processed result
Adjustable optical attenuator executes set-up function；The flash memory is for storing all configuration parameters of weak coherent light source device；
First digital analog converter stone is connect by adjustable optical attenuator driving circuit with the AXI data/address bus, described
First digital analog converter stone and the adjustable optical attenuator driving circuit are for driving adjustable optical attenuator to execute set-up function；
First analog-digital converter stone is connect by light intensity detection circuit with the AXI data/address bus, first modulus
Converter stone and the light intensity detection circuit are for carrying out light-intensity test；
Second digital analog converter stone is connect by laser temperature control circuit with the AXI data/address bus, and described
Two digital analog converter stones and the laser temperature control circuit are used for the closed-loop control of the laser temperature；
Second analog-digital converter stone is connect by state acquisition and monitoring circuit with the AXI data/address bus, and described the
Two analog-digital converter stones and the state acquisition and monitoring circuit are for carrying out laser status acquisition and monitoring.
Preferably, in above-mentioned weak coherent light source device, the intensity of the first via optical signal is greater than second road light
The intensity of signal.
Preferably, in above-mentioned weak coherent light source device, the light source control chip is used for according to the voltage signal control
The adjustable optical attenuator is made, to carry out attenuation processing to second road optical signal, and for according to the detection signal control
The control detection circuit is made, to adjust the operating temperature and working condition of the laser.
The utility model additionally provides a kind of quantum key distribution system, including weak coherent light source described in any of the above embodiments
Device.
As can be seen from the above description, in the weak coherent light source device and QKD system that technical solutions of the utility model provide,
Using light source control chip controls burst pulse generation module and control detection circuit, to control the relevant of laser transmitting setting
Optical signal.The coherent light signal is divided into first via optical signal and the second road optical signal by beam splitter, can be based on photoelectricity two
The light-intensity test of pole pipe and conversion circuit detection first via optical signal is as a result, control adjustable optical attenuator to second road light
Signal carries out attenuation processing, forms the weak coherent light signal for being used for quantum communications.And the weak coherent light source device can be with base
Adjustable attenuation is carried out to another part in a part of coherent light signal, light channel structure is simple, it is easy to accomplish control.
After traditional weak coherent light source device uses multiple independent single-chip packages, then connect on pcb board.This is practical new
In type embodiment, burst pulse generation module can use multi-chip module (MCM) encapsulation technology, containing multiple in a module
Chip not only improves packaging density, due also to the spacing between multiple chips reduces, wiring density is improved, so that entire module
Performance and reliability be significantly improved for conventional light source apparatus structure.Meanwhile burst pulse generation module uses MCM
Encapsulation technology shortens the transmission range of chip chamber, and transmission line effect can be ignored, and does not need to carry out impedance matching, power consumption is bright
It is aobvious to reduce.Further, light source control chip can use SoC technology, by VOA driving function, light intensity test function, laser
Temperature control function and state acquisition and monitoring function carry out IPization design, are on the one hand greatly improved weak coherent light source device
The integrated level of circuit reduces the area of circuit, on the other hand has higher reliability and scalability.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is a kind of structural schematic diagram of weak coherent light source device provided by the embodiment of the utility model；
Fig. 2 is a kind of structural schematic diagram of burst pulse generation module provided by the embodiment of the utility model；
Fig. 3 is a kind of circuit diagram of integrated circuit high speed hysteresis comparator bare chip provided by the embodiment of the utility model；
Fig. 4 is a kind of electricity of binary channels integrated circuit high-speed-differential logic gate bare chip provided by the embodiment of the utility model
Lu Tu；
Fig. 5 is that a kind of burst pulse provided by the embodiment of the utility model generates waveform timing chart；
Fig. 6 is a kind of system architecture schematic diagram of the light source control chip provided by the embodiment of the utility model.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Currently, weak coherent light source device generallys use discrete circuit and element builds driving and control circuit to realize,
Volume is relatively large, and flexibility is relatively poor, is not able to satisfy growing QKD system miniature requirement.In order to reduce weak phase
The volume of dry light supply apparatus reduces the volume of interlock circuit, needs to improve the integrated level of discrete circuit.The utility model is using more
The mode of module packaging technique and system on chip is designed instead of traditional circuit design, is provided a kind of integrated weak relevant
Light supply apparatus solves the problems, such as that weak coherent light source device integrated level is poor, volume is big, flexibility is low in QKD system, and can have
Effect improve weak coherent light source rate and reliability, thus improve quantum key distribution system at code rate and communication distance.
To keep the above objects, features, and advantages of the utility model more obvious and easy to understand, with reference to the accompanying drawing and have
Body embodiment is described in further detail the utility model.
With reference to Fig. 1, Fig. 1 is a kind of structural schematic diagram of weak coherent light source device provided by the embodiment of the utility model, institute
Coherent source device of giving the impression of weakness includes: burst pulse generation module 11, laser DFB-LD, light source control chip 12, control detection electricity
Road 13, beam splitter BS, conversion circuit 14, photodiode PD and adjustable optical attenuator 15.Light in the utility model embodiment
Source, which controls chip 12, to be light source control SOC (System on Chip, system on chip), be also possible to other types chip structure
Frame, as long as the identical function of light source control chip 12 described in the utility model embodiment can be formed, the adjustable light decay
Subtracting device 15 can be MEMS VOA (microcomputer electric-controlled adjustable optical attenuator), be also possible to other kinds of adjustable optical attenuator.
The burst pulse generation module 11 is for controlling the laser DFB-LD transmitting coherent light signal X3；The beam splitting
Device BS is for dividing the coherent light signal X3 for first via optical signal X10 and the second road optical signal X11；Two pole of photoelectricity
Pipe PD is used to the first via optical signal X10 being converted to current signal X9；The conversion circuit 14 is for believing the electric current
Number X9 is converted to voltage signal X8.
The adjustable optical attenuator 15 is used to carry out attenuation processing to the second road optical signal X11, forms weak coherent light
Signal X12 can control the second road optical signal X11 by the light source control chip 12 and carry out attenuation processing, example automatically
The adjustable optical attenuator 15 as described in the light source control chip 12 is used to be controlled according to the voltage signal X8, to described second
Road optical signal X11 carries out attenuation processing, forms weak coherent light signal X12.
The control detection circuit 13 is used to detect the operating temperature and working condition of the laser DFB-LD, generates
Detect signal X6；The control detection circuit 13 is also used to adjust the operating temperature and work shape of the laser DFB-LD
State can control the control detection circuit 13 by the light source control chip 12 and automatically adjust the laser DFB-LD's
Operating temperature and working condition, such as the light source control chip 12 are also used to control the control based on the detection signal X6
Detection circuit 13 processed, to adjust the operating temperature and working condition of the laser DFB-LD.
The light source control chip 12 can be to include clock signal for generating control signal X4, the control signal X4
And the IIC signal of data-signal, or other protocol signals.The burst pulse generation module 11 be based on input signal X1 with
And the control signal X4 controls the laser DFB-LD and emits coherent light signal X3, the input signal X1 includes inveigling state
Electric signal, signal state electric signal.
The burst pulse generation module 11 generates signal X2 according to the input signal X1 and control signal X4, passes through letter
Number X2 controls the laser DFB-LD and emits coherent light signal X3.The control detection circuit 13 detects the laser DFB-
The operating temperature and working condition of LD, obtains detection parameters X5, and the light source control chip 12 is generated based on detection parameters X5
Control signal X6, operating temperature and work shape of the control detection circuit 13 according to control signal X6 control laser DFB-LD
State.The light source control chip 12 generates control signal X7 according to the voltage signal X8, controls the adjustable optical attenuator 15,
Attenuation processing is carried out to the second road optical signal X11, forms weak coherent light signal X12.
Wherein, the intensity of the first via optical signal X10 is greater than the intensity of the second road optical signal X11.The weak phase
Dry light supply apparatus is used to form weak coherent light signal X12, and as the intensity of the first via optical signal X10 is greater than described second
The intensity of road optical signal X11 can make photoelectric conversion of the larger a part of light intensity for photodiode, carry out light convenient for it
Electricity conversion, can make small portion light intensity be used to prepare weak coherent light signal X12.Specifically, point of the beam splitter BS
Light ratio is that the intensity ratio of 99:1, the first via optical signal X10 and the second road optical signal X11 are 99:1.It can be according to reality
Border demand sets the splitting ratio of the beam splitter BS.
Burst pulse generation module 11 is used to complete the examination of the trick state electric signal and signal state electric signal of Differential Input,
It is generated for controlling high-speed narrow pulse, the functions such as amplitude adjusted for laser drive signal.Light source control chip 12 is used for
Complete the functions such as the control of burst pulse generation module 11, laser works condition monitoring, light-intensity test and feedback regulation.Control detection
Circuit 13 is used to control the working temperature constant of laser DFB-LD and detects to the working condition of laser DFB-LD.
Laser DFB-LD is semiconductor laser.Laser DFB-LD is for completing the function that electric signal is converted into coherent light signal.
Photodiode PD and conversion circuit 14 are used to complete the monitoring of light source intensity.Photodiode PD can be two pole of PIN photoelectricity
Pipe.Adjustable optical attenuator 15 is used for the function of completing to decay coherent light signal X3 at weak coherent light signal.
Table 1
In mode shown in the utility model Fig. 1, the number of each signal and corresponding meaning are referred to shown in table 1.
The working principle of weak coherent light source device shown in Fig. 1 is as follows: the input signal X1 based on quantum communications application protocol
It is input to burst pulse generation module 11, becomes signal X2 after the processing of burst pulse generation module 11 and is input to laser DFB-
In LD, coherent light signal X3 is generated.Coherent light signal X3 be divided into after the beam splitter BS of 99:1 first via optical signal X10 and
The intensity ratio of second road optical signal X11, first via optical signal X10 and the second road optical signal X11 are 99:1.First via optical signal
X10 is converted to current signal X9 after photodiode PD, after being converted to voltage signal X8 using conversion circuit 14, input
It is handled to light source control chip 12.Intensity of the light source control chip 12 by calculating voltage signal X8, output control signal
X7 controls adjustable optical attenuator 15 and carries out respective attenuation to the second road optical signal X11, and the weak coherent light signal X12 after decaying is
Weak coherent light signal needed for quantum communications.In addition, light source control chip 12 is control centre, with burst pulse generation module 11
It is communicated by IIC interface or other interface modes, by the interaction with control detection circuit 13, controls and monitors laser
The working condition etc. of DFB-LD.
With reference to Fig. 2, Fig. 2 is a kind of structural schematic diagram of burst pulse generation module provided by the embodiment of the utility model, institute
Show that burst pulse generation module 11 includes: the first high-speed pulse discriminator circuit 21 and the second high-speed pulse discriminator circuit 25.
For obtaining the input signal X1, the first high-speed pulse discriminator circuit 21 obtains first high-speed pulse discriminator circuit 21
Take the signal state electric signal and the trick state electric signal of Differential Input；The first high-speed pulse discriminator circuit 21 is successively
It is defeated by one of the first high-speed narrow pulse generation circuit 22 and the first amplitude regulating circuit 23 and high speed alternator driven coupling circuit 24
Enter end connection.
Second high-speed pulse discriminator circuit 25 is for obtaining the input signal X1, the signal state telecommunications of Differential Input
Number and the trick state electric signal；The second high-speed pulse discriminator circuit 25 passes sequentially through the second high-speed narrow pulse generation circuit
26 and second amplitude regulating circuit 27 connect with another input terminal of the high speed alternator driven coupling circuit 24.
Amplitude and bias control circuit 28, for obtaining the control signal X4；The amplitude and bias control circuit 28
Tool there are three output port, two output ports respectively with first amplitude regulating circuit 23 and the second amplitude regulating circuit
27 connections, another output mouth are used to provide bias control signal X21 for the laser DFB-LD.
The high speed alternator driven coupling circuit 24 are used to provide the electric drive of coherent light burst pulse for the laser DFB-LD
Signal X22.
The first high-speed pulse discriminator circuit 21 and the second high-speed pulse discriminator circuit 25 are as shown in Figure 3
Integrated circuit high speed hysteresis comparator bare chip U1, Fig. 3 are that a kind of integrated circuit high speed provided by the embodiment of the utility model is slow
The circuit diagram of stagnant comparator bare chip, outputting and inputting for the hysteresis comparator bare chip of integrated circuit high speed shown in Fig. 3 U1 are
Differential signal.
There are two input terminal and ground terminals for the integrated circuit high speed hysteresis comparator bare chip U1 tool.It is described two defeated
Enter to hold the signal state electric signal and the trick state electric signal for obtaining Differential Input；Connect between described two input terminals
It is connected to first resistor R1, the first resistor is for matching high speed hysteresis comparator impedance；The ground terminal passes through second resistance
R2 ground connection, the second resistance R2 is for adjusting sluggish comparative level.Specifically, integrated circuit high speed hysteresis comparator bare chip
Input terminal IN_P input signal Si g_P, another input terminal IN_N an input signal Si g_N, signal Sig_P and signal of U1
Sig_N is respectively signal state electric signal or the positive and negative anodes for inveigling state electric signal.Two output end (OUT_P and OUT_N) point
Other output signal Sig1_P and signal Sig1_N, signal Sig1_P are positive output signal, and signal Sig1_N is cathode output letter
Number.Integrated circuit high speed hysteresis comparator bare chip U1 has the input port HYS for adjusting sluggish level, the input port
HYS is grounded by resistance R2, can adjust integrated circuit high speed hysteresis comparator bare chip U1's by configuring resistance R2
Sluggish level.
The first high-speed narrow pulse generation circuit 22 and the second high-speed narrow pulse generation circuit 26 are such as Fig. 4 institute
Binary channels integrated circuit high-speed-differential logic gate the bare chip U2, Fig. 4 shown is a kind of bilateral provided by the embodiment of the utility model
The circuit diagram of road integrated circuit high-speed-differential logic gate bare chip.
Signal Sig1_P connects the electrode input end in the 2nd channel of binary channels integrated circuit high-speed-differential logic gate bare chip U2
D1_P.An electrode input signal Si g1_N of capacitor C1, and the electrode connects binary channels integrated circuit high-speed-differential logic gate
The channel selecting electrode input end of bare chip U2 is channel selecting electrode input end input signal Si g1_N_C, and capacitor C1's is another
One electrode is connect with power supply VCC and channel selecting impedance end.Binary channels integrated circuit high-speed-differential logic gate bare chip U2
The 1st channel positive terminal D0_P ground connection, the negative pole end D0_N in the 1st channel meets power supply VCC, so that the 1st channel connects low level.
The negative pole end D1_N in the 2nd channel is grounded by resistance R3.Positive terminal D1_P also passes through resistance R5 and connect with power supply VCC, this is negative
Poles D 1_N also passes through resistance R6 and connect with power supply VCC.R5 and R6 can be equal to 50 Ω, and R5 and R6 resistance value can be according to demand
Setting, including it is not limited to 50 Ω.
The channel selecting negative input of binary channels integrated circuit high-speed-differential logic gate bare chip U2 is connect by resistance R4
Ground.In the binary channels integrated circuit high-speed-differential logic gate bare chip U2, its channel selecting electrode input end is set and passes through electricity
Hold C1 to connect with power supply VCC, the generation of its burst pulse can be made to be based on capacitor C1 delay and realized.Binary channels integrated circuit high speed
The cathode output end OUT_P output signal Sig2_P of differential logic door bare chip U2, cathode output end OUT_N output signal
Sig2_N.Signal Sig2_P and Sig2_N is input to respective amplitude and adjusts circuit.
First amplitude regulating circuit 23 and second amplitude regulating circuit 27 are radio frequency triode bare chip.Institute
It states amplitude and bias control circuit 28 is integrated circuit analog-digital converter bare chip.The high speed alternator driven coupling circuit 24 are capacity
It is the capacitor of low capacity equal to the capacitor of preset value.The preset value can be 100pF.The pulse width of capacitance and demand
Related, demand pulse width is narrower, and capacitor's capacity is smaller, therefore the pulse width selection capacitance that can according to need, including but
It is not limited to 100pF.Capacitor is conventional capacitive, and capacitance type selecting is mainly calculated according to pulse width.
It should be noted that referring to that frequency is greater than 1GHz at a high speed in the utility model embodiment.The burst pulse generation module
In 11, using multi-chip module (MCM) encapsulation technology, the integrated circuit high speed hysteresis comparator bare chip U1, the bilateral
Road integrated circuit high-speed-differential logic gate bare chip U2, the radio frequency triode bare chip and the integrated circuit modulus turn
Parallel operation bare chip is bundled on same ceramic substrate, is encapsulated in the same shell, and the distance of chip chamber is greatly shortened, and is reduced
The delay of signal, promotion signal integrality improve the rate of signal.
The high-speed-differential logic gate bare chip U2 signal sequence of binary channels integrated circuit shown in Fig. 4 is as shown in figure 5, Fig. 5 is this
A kind of burst pulse that utility model embodiment provides generates waveform timing chart, and signal Sig1_N failing edge after capacitor C1 becomes
Slow, after forming delay signal Sig1_N_C.During signal Sig1_N_C is jumped from high level to low level, signal
Sig1_P is jumped from low level to high level, and since signal Sig1_P jump is very fast, signal Sig1_P and signal Sig1_N_C exist
It is simultaneously high level in shorter a period of time, the output pulse generated in this time is burst pulse.
In the burst pulse generation module 11 of MCM package, external interface input/output signal needs including but not limited to table
Mode shown in 2:
Table 2
| Serial number | Signal name | I/O mode | Paraphrase |
| B1 | VCC | Input | Power input |
| B2 | GND | Input | Power input |
| B3 | OP_SCL | Input | IIC clock signal |
| B4 | OP_SDO | Input/output | IIC data-signal |
| B5 | Sig_P | Input | Signal state Differential Input anode |
| B6 | Sig_N | Input | Signal state Differential Input cathode |
| B7 | Dec_P | Input | Inveigle state Differential Input anode |
| B8 | Dec_N | Input | Inveigle state Differential Input cathode |
| B9 | V_LD+ | Output | Laser anode bias voltage |
| B10 | V_LD- | Output | Laser cathode bias voltage |
| B11 | I_BIAS | Output | Laser DC bias signal |
The light source control chip 12 is as shown in fig. 6, Fig. 6 is a kind of light source control provided by the embodiment of the utility model
The structural schematic diagram of coremaking piece, the shown light source control chip 12 include: connect respectively with AXI data/address bus 31 it is embedded
Processor 32, flash memory (FLASH) 33 and interface 34；The embeded processor 32 is based on data for carrying out data processing
Processing result controls the burst pulse generation module 11, the control detection circuit 13 and adjustable optical attenuator 15 and executes setting
Function；The FLASH 33 is for storing all configuration parameters of weak coherent light source device.FLASH 33 connects with serial peripheral
Mouth (SPI).Interface 34 includes one in IIC protocol interface, UART protocol interface, SPI protocol interface and GPIO protocol interface
It is a or multiple.
The light source control chip 12 further includes the first digital analog converter stone 35, by VOA driving circuit 36 with it is described
AXI data/address bus 31 connects, and the first digital analog converter stone 35 is with the VOA driving circuit 36 for driving adjustable light decay
Subtract device 15 and executes set-up function.
The light source control chip 12 further includes the first analog-digital converter stone 37, by light intensity detection circuit 38 with it is described
AXI data/address bus 31 connects, and the first analog-digital converter stone 37 is with the light intensity detection circuit 38 for carrying out light intensity inspection
It surveys.
The light source control chip 12 further includes the second digital analog converter stone 39, passes through laser temperature control circuit 40
It is connect with the AXI data/address bus 31, the second digital analog converter stone 39 is used with the laser temperature control circuit 40
In the closed-loop control of the laser DFB-LD temperature.
The light source control chip 12 further includes the second analog-digital converter stone 41, passes through state acquisition and monitoring circuit 42
It is connect with the AXI data/address bus 31, the second analog-digital converter stone 41 is used with the state acquisition and monitoring circuit 42
In progress laser status acquisition and monitoring.
In Fig. 6, signal X6-1 is that laser temperature controls signal, and signal X6-2 is state detection signal.Above-mentioned signal X6
Including signal X6-1 and signal X6-2.
In the light source control chip 12, external interface input/output signal needs including but not limited to side shown in table 3
Formula:
Table 3
In table 3, A1 and A2 are that signal X4, A3 and A4 are signal X7, and A5 is signal X8, and A7 is a part of signal X6, A6
The a part for being signal X6 with A8.
The light source control chip 12 is customized SoC, VOA driving circuit 36, light intensity detection circuit 38, laser
Temperature-control circuit 40, state acquisition and monitoring circuit 42 are suitable for self-definition design IP kernel.
Weak coherent light source device described in the utility model embodiment has the advantages that
After traditional weak coherent light source device uses multiple independent single-chip packages, then connect on pcb board.This is practical new
In type embodiment, burst pulse generation module 11 uses multi-chip module (MCM) encapsulation technology, and multiple cores are contained in a module
Piece not only improves packaging density, due also to the spacing between multiple chips reduces, wiring density is improved, so that entire module
Performance and reliability are significantly improved for conventional light source apparatus structure.
Burst pulse generation module 11 uses MCM package technology, shortens the transmission range of chip chamber, and transmission line effect can be with
Ignore, does not need to carry out impedance matching, power consumption is substantially reduced.
Light source control chip 12 uses SoC technology, and VOA driving function, light intensity test function, laser temperature are controlled function
Energy and state acquisition and monitoring function carry out IPization design, are on the one hand greatly improved the integrated of weak coherent light source device circuit
Degree, reduces the area of circuit, on the other hand has higher reliability and scalability.
Based on the above embodiment, another embodiment of the utility model additionally provides a kind of QKD system, the QKD system packet
Include above-described embodiment weak coherent light source device.QKD system described in the utility model embodiment has weak described in above-described embodiment
Coherent source device has higher integrated level, and circuit structure is simple, and small in size, reliability and stability are good, has preferable
Scalability.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.For QKD system disclosed in embodiment
For system, since it is corresponding with weak coherent light source device disclosed in embodiment, so being described relatively simple, related place ginseng
See that weak coherent light source device part illustrates.
It should also be noted that, herein, relational terms such as first and second and the like are used merely to one
Entity or operation are distinguished with another entity or operation, without necessarily requiring or implying between these entities or operation
There are any actual relationship or orders.Moreover, the terms "include", "comprise" or its any other variant are intended to contain
Lid non-exclusive inclusion, so that article or equipment including a series of elements not only include those elements, but also
It including other elements that are not explicitly listed, or further include for this article or the intrinsic element of equipment.Do not having
In the case where more limitations, the element that is limited by sentence "including a ...", it is not excluded that in the article including above-mentioned element
Or there is also other identical elements in equipment.
The foregoing description of the disclosed embodiments can be realized professional and technical personnel in the field or using originally practical new
Type.Various modifications to these embodiments will be readily apparent to those skilled in the art, and determine herein
The General Principle of justice can be realized in other embodiments without departing from the spirit or scope of the present utility model.Cause
This, the present invention will not be limited to the embodiments shown herein, and is to fit to and principles disclosed herein
The widest scope consistent with features of novelty.
Claims (11)
1. a kind of weak coherent light source device, which is characterized in that the weak coherent light source device includes:
Burst pulse generation module, laser, light source control chip, control detection circuit, beam splitter, conversion circuit, two pole of photoelectricity
Pipe and adjustable optical attenuator；
The burst pulse generation module is for controlling the laser transmitting burst pulse coherent light signal；
The beam splitter is used to the coherent light signal being divided into first via optical signal and the second road optical signal；
The photodiode is used to the first via optical signal being converted to current signal；
The conversion circuit is used to the current signal being converted to voltage signal；The adjustable optical attenuator is used for described the
Two road optical signals carry out attenuation processing, form weak coherent light signal；
The control detection circuit is used to detect the operating temperature and working condition of the laser, generates detection signal；
The control detection circuit is used to adjust the operating temperature and working condition of the laser；
The light source control chip is for obtaining the voltage signal and the detection signal.
2. weak coherent light source device according to claim 1, which is characterized in that the light source control chip is for generating control
Signal processed, the control signal includes clock signal and data-signal；
The burst pulse generation module is based on input signal and the control signal controls the laser transmitting coherent light letter
Number, the input signal includes inveigling state electric signal, signal state electric signal.
3. weak coherent light source device according to claim 2, which is characterized in that the burst pulse generation module includes:
First high-speed pulse discriminator circuit, for obtaining the input signal；The first high-speed pulse discriminator circuit successively leads to
The first high-speed narrow pulse generation circuit and the first amplitude regulating circuit is crossed to connect with an input terminal of high speed alternator driven coupling circuit；
Second high-speed pulse discriminator circuit, for obtaining the input signal；The second high-speed pulse discriminator circuit successively leads to
Cross another input of the second high-speed narrow pulse generation circuit and the second amplitude regulating circuit and the high speed alternator driven coupling circuit
End connection；
Amplitude and bias control circuit, for obtaining the control signal；There are three defeated for the amplitude and bias control circuit tool
Exit port, two output ports are connect with first amplitude regulating circuit and the second amplitude regulating circuit respectively, another
Output port is used to provide bias control signal for the laser；
The high speed alternator driven coupling circuit are used to provide the electric drive signal of coherent light burst pulse for the laser.
4. weak coherent light source device according to claim 3, which is characterized in that the first high-speed pulse discriminator circuit with
The second high-speed pulse discriminator circuit is integrated circuit high speed hysteresis comparator bare chip；
The first high-speed narrow pulse generation circuit and the second high-speed narrow pulse generation circuit are binary channels integrated circuit
High-speed-differential logic gate bare chip；
First amplitude regulating circuit and second amplitude regulating circuit are radio frequency triode bare chip；
The amplitude and bias control circuit are integrated circuit analog-digital converter bare chip；
The high speed alternator driven coupling circuit are the capacitor that capacity is equal to preset value.
5. weak coherent light source device according to claim 4, which is characterized in that described in the burst pulse generation module
Integrated circuit high speed hysteresis comparator bare chip, the binary channels integrated circuit high-speed-differential logic gate bare chip, the radio frequency
Triode bare chip and the integrated circuit analog-digital converter bare chip are bundled on same ceramic substrate, are encapsulated in same
In a shell.
6. weak coherent light source device according to claim 4, which is characterized in that the binary channels integrated circuit high-speed-differential
In logic gate bare chip, channel selecting electrode input end is connected to power supply by capacitor, so that the generation of its burst pulse is based on
Capacitor delay is realized.
7. weak coherent light source device according to claim 4, which is characterized in that the integrated circuit high speed hysteresis comparator
There are two input terminal and ground terminals for bare chip tool；
Described two input terminals are used to obtain the signal state electric signal and the trick state electric signal of Differential Input；Described two
First resistor is connected between a input terminal, the first resistor is for matching high speed hysteresis comparator impedance；The ground terminal
It is grounded by second resistance, the second resistance is for adjusting sluggish comparative level.
8. weak coherent light source device according to claim 1, which is characterized in that the light source control chip includes:
Embeded processor, flash memory and the interface being connect respectively with AXI data/address bus；The embeded processor is for carrying out
Data processing controls the burst pulse generation module, the control detection circuit and described adjustable based on data processed result
Optical attenuator executes set-up function；The flash memory is for storing all configuration parameters of weak coherent light source device；
First digital analog converter stone is connect by adjustable optical attenuator driving circuit with the AXI data/address bus, described first
Digital analog converter stone and the adjustable optical attenuator driving circuit are for driving adjustable optical attenuator to execute set-up function；
First analog-digital converter stone is connect by light intensity detection circuit with the AXI data/address bus, first analog-to-digital conversion
Device stone and the light intensity detection circuit are for carrying out light-intensity test；
Second digital analog converter stone is connect by laser temperature control circuit with the AXI data/address bus, second number
Mode converter stone and the laser temperature control circuit are used for the closed-loop control of the laser temperature；
Second analog-digital converter stone is connect by state acquisition and monitoring circuit with the AXI data/address bus, second mould
Number converter stone and the state acquisition and monitoring circuit are for carrying out laser status acquisition and monitoring.
9. weak coherent light source device according to claim 1, which is characterized in that the intensity of the first via optical signal is greater than
The intensity of second road optical signal.
10. -9 described in any item weak coherent light source devices according to claim 1, which is characterized in that the light source control chip
For controlling the adjustable optical attenuator according to the voltage signal, to carry out attenuation processing to second road optical signal, and
For controlling the control detection circuit according to the detection signal, to adjust the operating temperature and work shape of the laser
State.
11. a kind of quantum key distribution system characterized by comprising as claim 1-10 is described in any item weak relevant
Light supply apparatus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822151294.4U CN209218096U (en) | 2018-12-18 | 2018-12-18 | Weak coherent light source device and quantum key distribution system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822151294.4U CN209218096U (en) | 2018-12-18 | 2018-12-18 | Weak coherent light source device and quantum key distribution system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209218096U true CN209218096U (en) | 2019-08-06 |
Family
ID=67465410
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822151294.4U Withdrawn - After Issue CN209218096U (en) | 2018-12-18 | 2018-12-18 | Weak coherent light source device and quantum key distribution system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209218096U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620616A (en) * | 2018-12-18 | 2019-12-27 | 科大国盾量子技术股份有限公司 | Weak coherent light source device and quantum key distribution system |
| CN111180998A (en) * | 2020-01-03 | 2020-05-19 | 国开启科量子技术(北京)有限公司 | Method and device for realizing narrow pulse laser driving circuit without delay chip |
| CN111313226A (en) * | 2020-02-21 | 2020-06-19 | 国开启科量子技术(北京)有限公司 | High-speed driving method and device for quantum communication high-extinction-ratio narrow-pulse light source |
| CN112860620A (en) * | 2019-11-28 | 2021-05-28 | 科大国盾量子技术股份有限公司 | SOC (system on chip) framework chip for QKD (quantum key distribution) system |
-
2018
- 2018-12-18 CN CN201822151294.4U patent/CN209218096U/en not_active Withdrawn - After Issue
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110620616A (en) * | 2018-12-18 | 2019-12-27 | 科大国盾量子技术股份有限公司 | Weak coherent light source device and quantum key distribution system |
| CN110620616B (en) * | 2018-12-18 | 2023-01-31 | 科大国盾量子技术股份有限公司 | Weak coherent light source device and quantum key distribution system |
| CN112860620A (en) * | 2019-11-28 | 2021-05-28 | 科大国盾量子技术股份有限公司 | SOC (system on chip) framework chip for QKD (quantum key distribution) system |
| CN112860620B (en) * | 2019-11-28 | 2024-04-26 | 科大国盾量子技术股份有限公司 | SOC framework chip for QKD system |
| CN111180998A (en) * | 2020-01-03 | 2020-05-19 | 国开启科量子技术(北京)有限公司 | Method and device for realizing narrow pulse laser driving circuit without delay chip |
| CN111313226A (en) * | 2020-02-21 | 2020-06-19 | 国开启科量子技术(北京)有限公司 | High-speed driving method and device for quantum communication high-extinction-ratio narrow-pulse light source |
| CN111313226B (en) * | 2020-02-21 | 2021-12-03 | 国开启科量子技术(北京)有限公司 | High-speed driving method and device for quantum communication high-extinction-ratio narrow-pulse light source |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN209218096U (en) | Weak coherent light source device and quantum key distribution system | |
| CN102637122B (en) | The parity of physically based deformation noise generates method and the system thereof of true random number | |
| CN112866836B (en) | Information exchange device based on VPX architecture | |
| CN106253979A (en) | A kind of optical signal linear transmission system and Active Electronic Current Transformer | |
| CN109946551A (en) | It is a kind of for testing laser source, the device of detector and its test method | |
| CN110620616B (en) | Weak coherent light source device and quantum key distribution system | |
| CN208547936U (en) | The real-time quantum random number generator of high speed based on photoelectricity hybrid integrated | |
| CN110677193B (en) | Industrial-grade PAM 4200G error code testing device | |
| US9252756B2 (en) | Random number generating device | |
| CN103066996A (en) | Oscillator and self-calibration method thereof | |
| CN107370014A (en) | A kind of laser control circuit and laser | |
| CN109975642A (en) | A kind of test device and its test method of Distributed Feedback Laser | |
| CN105915292A (en) | 28G SFP packaged optical module | |
| CN103873038B (en) | Delay time adjusting circuit, delay time adjusting method and integrated circuit | |
| CN209767539U (en) | Device for generating test signal and test system | |
| CN102209411B (en) | High-precision current control method and system applicable to light emitting diode (LED) driver | |
| CN206960966U (en) | Electron speed regulator anti-jamming circuit, substrate and unmanned plane | |
| CN110417475A (en) | A kind of electrical-optical conversion module bias point without spuious locking system and method | |
| CN202634363U (en) | Trimming circuit used for oscillator | |
| CN201260025Y (en) | Laser driving source | |
| CN205940583U (en) | Photoelectricity transmit -receive tube drive circuit | |
| CN115048077A (en) | Quantum random number generator | |
| CN106533118A (en) | Superconductive array driving apparatus, super-low-frequency superconductive voltage source and control method | |
| CN210112325U (en) | Color temperature adjustable light source module | |
| CN202841147U (en) | Bit error rate test apparatus |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20190806 Effective date of abandoning: 20230131 |
|
| AV01 | Patent right actively abandoned |
Granted publication date: 20190806 Effective date of abandoning: 20230131 |
|
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |