CN209151169U - A kind of transmitter coding device based on photoswitch - Google Patents
A kind of transmitter coding device based on photoswitch Download PDFInfo
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- CN209151169U CN209151169U CN201822028635.9U CN201822028635U CN209151169U CN 209151169 U CN209151169 U CN 209151169U CN 201822028635 U CN201822028635 U CN 201822028635U CN 209151169 U CN209151169 U CN 209151169U
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Abstract
The application provides a kind of transmitter coding device based on photoswitch, it include: the light pulse control device for issuing the laser light source of periodic optical pulse and being controlled by encoded signal, wherein the optical routing device of light pulse control device be used for by the optical path of light pulse all the way that laser light source issues be sent at least four tunnel light pulse optical paths certain all the way in, wherein two-way optical path by MZ interferometer, optical path string has fibre delay line all the way, optical path is not necessarily to fibre delay line, deadline phase code all the way.By fibre delay line and without fibre delay line this two optical paths through the first bundling device close beam after, with the emitting light path after MZ interferometer through the second bundling device close beam.Therefore solve following problems: phase controller control and calibration are complicated；There is error rate caused by the variation in phase encoding pulse front and back pulse spacing in laser light source aging；The error rate injecting the indefinite of locking effect and thus introducing；The control complexity of original device is high.
Description
Technical field
This application involves optical communication technology fields, and in particular to a kind of transmitter coding device based on photoswitch.
Background technique
Quantum communication technology is a kind of communication security technology that current safety obtains Strict Proof, have reached it is practical,
Industrialization level.Quantum communication is to generate quantum key using quantum state, is carried out using quantum key to the data that needs transmit
A kind of mechanics of communication transmitted after quantum cryptography processing.
The device and scheme basic condition such as Fig. 1 institute that existing quantum communication system encodes the time of light and phase
Show:
Laser light source 1 issues periodic optical pulse, and after MZ interferometer 2, light pulse is divided into front and back two in the time domain
A light pulse；The two light pulses are after intensity modulator 11, and intensity modulator 11 is by the one before pulse or rear amplitude
It is modulated to nearly 0 level, i.e. the deadline encodes；Hereafter, phase-modulator 12, phase-modulation are successively passed through in two light pulses
Device 12 carries out phase-modulation to one of pulse, i.e. completion phase-modulation.
The above intensity modulator 11 and the commutative sequence of phase-modulator 12, thus after first completing phase-modulation on coding
Deadline modulation, this mode can also complete whole time phase coding.
The device and scheme that existing quantum communication system encodes the time of light and phase mainly have the following two kinds:
A kind of device is as shown in Fig. 2, the transmitter coding device locks coded laser light light using the injection of primary laser source 21
Phase-modulation is completed in source 22.The injection of primary laser source 21 advances into the completion of MZ interferometer 2 phase and fixes, and then passes through circulator
23 injection coded laser light light sources 22.After injection, coded laser light light source 22 is issued by former and later two timing by injection locking technique
The PGC demodulation of pulse.Two connected light pulses enter phase-modulator by circulator 23, are π by phase-modulation.In addition
A kind of transmitter coding device of time phase coding is as shown in figure 3, the device is to carry out phase respectively using multiple laser light sources
The modulation of position and time, wherein first phase coded laser light device 31 and second phase coded laser light device 32 issue light pulse and enter
MZ interferometer 2 is completed phase and is fixed；The light pulse of the sending time encoding of time encoding laser 33；The above two-way light pulse into
Enter bundling device 34 and synthesizes a branch of, deadline phase code.
However according to device shown in Fig. 2, need using injection locking technique and phase modulator modulation.Injection locking
Model itself is complicated, and without complete theories integration, the effect of PGC demodulation is difficult to judge, injection locks brought laser light
The error rate that source reflection introduces also is difficult to avoid.And primary laser source is over time, it may appear that aging phenomenon causes
Pulse spacing variation causes to interfere contrast variation before and after the phase encoding pulse that primary laser source issues, with the phase tune in time
System just will appear deviation, and in addition there are phase-modulator in this kind of transmitter coding device, control and calibration are also complex.
According to device shown in Fig. 3, there are SPECTRAL DIVERSITY and optical pulse shape differences for the light that different laser light sources are launched, thus easily
Therefore it is attacked.
In addition, both schemes are required to two-way light source, it is respectively completed the control of impulse phase and pulse interval.And
And both coding modes, it is required to slave laser light source and carries out time encoding, the requirement for laser light source is relatively high.
Summary of the invention
The application provides a kind of real-time stability maintenance device of light intensity modulation, to solve the 1. phase controlling in currently existing scheme
Device control and calibration are complicated；2. mistake caused by the variation in pulse spacing before and after phase encoding pulse caused by laser light source aging
Rate；3. the error rate injecting the indefinite of locking effect and thus introducing；4. needing two-way light source and thus bring controlling again
The light pulse that miscellaneous degree and light source issue is difficult to completely the same problem.
The application provides a kind of transmitter coding device based on photoswitch, comprising: issues the laser of periodic optical pulse
Light source, optical routing device, MZ interferometer, fibre delay line, the first bundling device and the second bundling device.
A certain optical fiber of the light pulse that the optical routing device is used to that the laser light source to be allowed to issue Jing Guo incidence end into
Enter after optical routing device at least four tunnel optical paths all the way.
Wherein first via light pulse optical path and the second tunnel light pulse optical path incidence end two with the MZ interferometer respectively
Arm connection；The light pulse of phase-modulation all the way is exported afterwards.
Wherein third road light pulse optical path is connected to first with the 4th tunnel light pulse optical path after fibre delay line all the way
Two input optical fibres of bundling device；
The exit end of the MZ interferometer and the output optical fibre of the first bundling device are connected to two inputs of the second bundling device
Optical fiber.
Preferably, the optical routing device is the high-speed optical switch of 1Xn, wherein n >=2, and n is positive integer.
Preferably, the optical routing device 2 is 1 1X4 high-speed optical switch or the high-speed optical switch of 3 1X2.
Preferably, when the high-speed optical switch that the optical routing device 2 is 3 1X2
Preferably, 1 high-speed optical switch one end therein is connect with the laser light source, two optical paths that the other end separates
It is connect respectively with remaining 2 high-speed optical switch.
Preferably, the optical routing device 2 can also be the high-speed optical switch of 2 1X2 of connection after 1 beam splitter.
Preferably, described beam splitter one end therein is connect with the laser light source, two optical paths that the other end projects point
It is not connect with 2 high-speed optical switches.
Preferably, this device controls the closing and conducting of the high-speed optical switch by the voltage that encoded signal controls
State.
As it can be seen from the above scheme the application has the advantages that
Single laser light source, security breaches existing for no multibeam laser light source are used only in this programme；
This programme is not necessarily to injection locking technique, increases interferometer before modulation, the interferometer ginseng of the interferometer and recipient
Number is consistent (i.e. the matching of interference length), weakens launch party because aging causes wavelength shift bring to influence, increases system
Reliability；This programme device is simple, no phase-modulator, and need not use phase locking techniques, it will be able to realize single laser
Modulation of the light source to time and phase；
The pulsed light of laser light source transmit cycle, spectrum, time domain impulse characteristic are than than more, while the nothing of Stochastic Modulation
Need in laser light source the deadline encode, reduce the requirement to laser light source；
This programme understands simple, easy to operate, the photoelectric circuit debugging process without complexity.
Detailed description of the invention
In order to illustrate more clearly of the technical solution of the application, letter will be made to attached drawing needed in the embodiment below
Singly introduce, it should be apparent that, for those of ordinary skills, without creative efforts, also
Other drawings may be obtained according to these drawings without any creative labor.
Fig. 1 is the general structure figure of existing time phase transmitter coding device；
Fig. 2 is the transmitter coding device of existing single coded laser light light source；
Fig. 3 is the transmitter coding device of existing multiple laser light sources；
Fig. 4 is a kind of transmitter coding schematic diagram of device of the application；
Fig. 5 is another transmitter coding schematic diagram of device of the application；
Fig. 6 is another transmitter coding schematic diagram of device of the application；
Fig. 7 is the corresponding time phase coded pulse schematic diagram of the application.
Specific embodiment
In order to make the above objects, features, and advantages of the present application more apparent, with reference to the accompanying drawing and it is specific real
Applying mode, the present application will be further described in detail.
The application provides a kind of transmitter coding device based on photoswitch, comprising: issues the laser of periodic optical pulse
Light source 1, optical routing device 2, MZ interferometer 3, optical path delayed line 4, the first bundling device 5 and the second bundling device 6；The optical path
Selection device 2 is used to the light pulse that the laser light source 1 issues entering the subsequent at least four road Guang Mai of optical routing device 2
It washes off in road all the way；Wherein first via light pulse optical path F1 and the second tunnel light pulse optical path F2 respectively with the MZ interferometer
3 incidence end two-arm connection；Wherein third road light pulse optical path F3 after fibre delay line 4 all the way with the 4th tunnel light pulse light
Road F4 is connected to two incident opticals of the first bundling device 5；The output optical fibre of first bundling device 5 and the exit end of MZ interferometer 3
Optical fiber be connected to two incident opticals of the second bundling device 6.The light pulse that the laser light source 1 issues, by package unit
Afterwards, the light pulse encoded from the output end of second bundling device 6 output time phase, time phase, coded pulse was refering to Fig. 7
Corresponding time phase coded pulse schematic diagram
Therefore, a laser light source 1 is contained only in the transmitter coding device of the application, therefore is existed without multibeam laser light source
Security breaches.The transmitter coding device of the application includes a laser light source 1, optical routing device 2, MZ interferometer 3, light
Fine delay line 4, the first bundling device 5, the second bundling device 6 and the necessary optical fiber for playing connection function, there is no need to inject lock
Determine technology.The transmitter coding device of the application without increasing interferometer before modulation, the interferometer of the interferometer and recipient
Parameter is unanimously the matching of interference length, thus reduces launch party because aging causes wavelength shift bring to influence, increases
The reliability of system.The pulsed light of 1 transmit cycle of laser light source of the application, spectrum, time domain impulse characteristic compare Stochastic Modulation
It is more, while without in laser light source 1 deadline encode, reduce the requirement to laser light source 1.The hair of the application
It is simple to penetrate machine code device device, no phase-modulator, and phase locking techniques need not be used, it will be able to realize single laser light
Modulation of the source to time and phase.
The optical routing device 2 is the high-speed optical switch of 1Xn, wherein n >=2, and n is positive integer.The optical path of the application is selected
The high-speed optical switch for selecting 2 choosing multiple specification of device is combined into required specification with mode in parallel by connecting.Specifically
For, the optical routing device 2 can be in the high-speed optical switch of 1 1X4 or the high-speed optical switch of 3 1X2, when described
Optical routing device 2 when being the high-speed optical switch of 3 1X2,1 high-speed optical switch one end therein and the laser light source 1
Connection, two optical paths that the other end projects are connect with the incidence end of remaining 2 high-speed optical switch respectively.The optical routing device
2 can also be the high-speed optical switch of 2 1X2 of connection after 1 beam splitter；Described beam splitter one end therein and the laser light source
Connection, two optical paths that the other end projects are connect with 2 high-speed optical switches respectively.
In the scheme of above-mentioned any one, the high-speed light that package unit is controlled by voltage that encoded signal controls
The closing and on state of switch.Therefore, the transmitter coding device of the application has structure simple, easy to operate, is not necessarily to
The characteristics of photoelectric circuit debugging process of complexity.
[embodiment 1]
A kind of transmitter coding device of the application, as shown in figure 4, optical routing device 2 is opened by the high-speed light of a 1X4
It closes and constitutes, it is common to complete with unifying 3, two bundling devices of a unequal arm MZ interferometer 5,6, the optical pulse delay line 4 of certain length
Time phase coding.First optical path F1 of the high-speed optical switch exit end is connected to an arm of MZ interferometer 3, and the second optical path F2 connects
It is connected to another arm of MZ interferometer 3, wherein the adjusting offset of the two-way optical path of MZ interferometer 3 is π.What high-speed optical switch projected
Third optical path F3 is connected to one end of an optical delay line 4, and wherein the delay length of optical delay line 4 is encoded signal requirement
MZ interferometer 3 arm length difference.The other end of optical delay line 4 is connect with the 4th optical path F4 that high-speed optical switch projects through optical fiber
To the first bundling device 5.Then the output end of the output end of MZ interferometer 3 and the first bundling device 5 is connected to the second conjunction through optical fiber
Two input optical fibres of beam device 6.Package unit opens the light upper added voltage by encoded signal control high-speed light to control high-speed light
Switch per all the way conducting or closed state, the light pulse that the laser light source 1 issues is after package unit, from described the
After the exit end of two bundling devices 6, become the light pulse encoded by time phase.It should be noted that the first optical path F1 and the
The summation of two optical path F2 is equal with the summation of third optical path F3 and the 4th optical path F4, and following embodiments also have this requirement, therefore
Following embodiments are not repeating.
The recurrent pulse opportunistic transmission that laser light source 1 issues is into four input channels of high-speed optical switch, if some time
It carves laser light source 1 and issues vacuum state pulse, then the channel of high-speed optical switch is all closed.If certain moment laser light source 1 issues
Pulse be non-real empty state, by the light pulse of the first optical path F1 and the second optical path F2 pass through MZ interferometer 3 complete front and back arteries and veins
Rush the modulation that phase difference is 0 and π；The light pulse for entering third optical path F3 and the 4th optical path F4, due to optics after third optical path
The presence of delay line 4 completes the time encoding of front and back pulse.
[embodiment 2]
Another transmitter coding device of the application, as shown in Figure 5.Optical routing device 2 by three 1X2 high-speed light
Switch is constituted, with the optical pulse delay line and several optical fiber for unifying a unequal arm MZ interferometer, two bundling devices, certain length,
Collectively form this kind of time phase transmitter coding device.The first high-speed optical switch 211 is connected to after laser light source 1, first
Two exit ends of high-speed optical switch 211 are connected respectively to the second high-speed optical switch 212 and third high-speed optical switch 213.Second
The first optical path F1 after the switch of high-speed light 212 is connected to an arm of MZ interferometer 3, the second light after the second high-speed optical switch 212
Road F2 is connected to another arm of MZ interferometer 3, and wherein the adjusting offset of the two-way optical path of MZ interferometer 3 is π.Third high-speed light
One end of an optical delay line 4 is connected to after third optical path F3 after switch 213, wherein the delay length of optical delay line 4
For the arm length difference of the MZ interferometer 3 of time phase coding requirement.The other end and third high-speed optical switch 213 of optical delay line 4
The 4th optical path F4 afterwards is connected to the first bundling device 5.Then by the output end of the output end of MZ interferometer 3 and the first bundling device 5
Two input optical fibres of the second bundling device 6 are connected to through optical fiber.Package unit is controlled on three high-speed lights open the light by encoded signal
Added voltage come control each high-speed optical switch per all the way conducting or closed state, the light that the laser light source 1 issues
Pulse is after package unit, after the exit end of second bundling device 6, becomes the light pulse encoded by time phase.
Its coding-control mode is same as Example 1, and details are not described herein again.
[embodiment 3]
Another transmitter coding device of the application, as shown in Figure 6.Optical routing device by two 1X2 high-speed light
Switch and a beam splitter are constituted, with a unification unequal arm MZ interferometer, two bundling devices, the optical pulse delay line of certain length
With several optical fiber, time phase transmitter coding device is collectively formed.Beam splitter 221 is connected to after laser light source 1, in beam splitter
The first high-speed optical switch 211 and the second high-speed optical switch 212 are connected respectively to after 221.First after first high-speed optical switch 211
Optical path F1 is connected to an arm of MZ interferometer 3, and the second optical path F2 after the first high-speed optical switch 211 is connected to MZ interferometer 3
Another arm, wherein the adjusting offset of the two-way optical path of MZ interferometer 3 is π.Third optical path F3 after second high-speed optical switch 212
It is connected to one end of an optical delay line 4 afterwards, wherein the delay length of optical delay line 4 is the MZ of time phase coding requirement
The arm length difference of interferometer 3.The 4th after the other end of optical delay line 4 after third optical path F3 and the second high-speed optical switch 212
Optical path F4 is connected to the first bundling device 5.Then the output end of the output end of MZ interferometer 3 and the first bundling device 5 is connected through optical fiber
It is connected to two input optical fibres of the second bundling device 6.Package unit by encoded signal control two high-speed lights open the light it is upper added
Voltage come control each high-speed optical switch per all the way conducting or closed state, the light pulse warp that the laser light source 1 issues
After crossing package unit, after the exit end of second bundling device 6, become the light pulse encoded by time phase.
Its coding-control mode is same as Example 1, and details are not described herein again.
Combine detailed description and exemplary example that the application is described in detail above, but these explanations are simultaneously
It should not be understood as the limitation to the application.It will be appreciated by those skilled in the art that without departing from the application spirit and scope,
A variety of equivalent substitution, modification or improvements can be carried out to technical scheme and embodiments thereof, these each fall within the application
In the range of.The protection scope of the application is determined by the appended claims.
Claims (7)
1. a kind of transmitter coding device based on photoswitch characterized by comprising issue the laser light of periodic optical pulse
Source (1), the optical routing device (2) controlled by encoded signal, MZ interferometer (3), fibre delay line (4), first close beam
Device (5), the second bundling device (6) and several optical fiber and/or tail optical fiber；
The optical routing device is used to send four tunnel light pulses for the optical path of light pulse all the way that the laser light source (1) issues
On a certain item in optical path；
Wherein first via light pulse optical path (F1) and the second tunnel light pulse optical path (F2) enter with MZ interferometer (3) respectively
End two-arm connection is penetrated, exports phase modulated light pulse optical path all the way after the MZ interferometer (3)；
Wherein third road light pulse optical path (F3) passes through after fibre delay line all the way (4) with the 4th tunnel light pulse optical path (F4)
First bundling device (5) exports time-modulation light pulse optical path；
The phase modulated light pulse optical path and the time-modulation light pulse optical path pass through the second bundling device (6) conjunction beam, output
The light pulse of time phase coding.
2. the transmitter coding device according to claim 1 based on photoswitch, which is characterized in that the optical path selection dress
Set the high-speed optical switch that (2) are 1X4.
3. the transmitter coding device according to claim 1 based on photoswitch, which is characterized in that the optical path selection dress
Set the high-speed optical switch that (2) are 31 X2.
4. the transmitter coding device according to claim 3 based on photoswitch, which is characterized in that 1 high speed therein
Photoswitch one end is connect with the laser light source (1), and two optical paths that the other end projects connect with remaining 2 high-speed optical switch respectively
It connects.
5. the transmitter coding device according to claim 1 based on photoswitch, which is characterized in that the optical path selection dress
Setting (2) can also be the high-speed optical switch of 2 1X2 of connection after 1 beam splitter.
6. the transmitter coding device according to claim 5 based on photoswitch, which is characterized in that the beam splitting therein
Device one end is connect with the laser light source (1), and two optical paths that the other end projects are connect with 2 high-speed optical switches respectively.
7. the transmitter coding device according to claim 2-6 any one based on photoswitch, it is characterised in that: described
High-speed optical switch controls closing and on state by encoded signal.
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| CN201822028635.9U CN209151169U (en) | 2018-12-05 | 2018-12-05 | A kind of transmitter coding device based on photoswitch |
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| CN201822028635.9U CN209151169U (en) | 2018-12-05 | 2018-12-05 | A kind of transmitter coding device based on photoswitch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125724A (en) * | 2023-04-14 | 2023-05-16 | 合肥硅臻芯片技术有限公司 | Quantum light pulse generating device and method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116125724A (en) * | 2023-04-14 | 2023-05-16 | 合肥硅臻芯片技术有限公司 | Quantum light pulse generating device and method |
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