CN106789030A - A kind of local Active phase compensation system and method - Google Patents

A kind of local Active phase compensation system and method Download PDF

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Publication number
CN106789030A
CN106789030A CN201710026168.3A CN201710026168A CN106789030A CN 106789030 A CN106789030 A CN 106789030A CN 201710026168 A CN201710026168 A CN 201710026168A CN 106789030 A CN106789030 A CN 106789030A
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phase
optical fiber
light
light pulse
pulse
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CN106789030B (en
Inventor
王金东
颜士玲
兰立新
方俊彬
刘子豪
陈艳辉
马瑞丽
郑如雪
林加毅
赵峰
魏正军
张智明
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South China Normal University
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South China Normal University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0852—Quantum cryptography
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
    • H04L9/08—Key distribution or management, e.g. generation, sharing or updating, of cryptographic keys or passwords
    • H04L9/0816—Key establishment, i.e. cryptographic processes or cryptographic protocols whereby a shared secret becomes available to two or more parties, for subsequent use
    • H04L9/0852—Quantum cryptography
    • H04L9/0858—Details about key distillation or coding, e.g. reconciliation, error correction, privacy amplification, polarisation coding or phase coding

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)

Abstract

The invention provides a kind of local Active phase compensation system and method, it is related to field of quantum secure communication.A kind of local Active phase compensation system and method that the present invention is provided, because the acquisition process of signal sending end interference ring operating point is completely locally completed, the determination of signal receiving end odd-job point is also completely locally completed, so as to avoid in classical transmission scanning result, EVE is obtained phase information, improve security of system；Furthermore the local compensation of signal sending end and signal receiving end and hybrid compensation process scanning is intense light pulse interference curve, shortens sweep time, improves information dutycycle.

Description

A kind of local Active phase compensation system and method
Technical field
The present invention relates to field of quantum secure communication, in particular to a kind of local Active phase compensation system and side Method.
Background technology
Quantum key distribution is based on fundamental principles of quantum mechanics, is proved to that unconditional secure communication can be realized in theory, Cause the extensive concern of society.Quantum key distribution can be divided into the quantum key distribution of continuous variable and the quantum of discrete variable Key is distributed.Wherein, closest to practical application, the most frequently used coded system has phase to compile to discrete variable quantum key distribution system Code and polarization encoder, for phase code quantum key distribution system, can phase drift be to influence its actual performance and One of key factor of operation steady in a long-term under actual environment.
The Active phase compensation scheme of four phasescans of phase code quantum key distribution system of the prior art： Bob fixes load-modulate voltage, and the Single-photon interference curve of scanning Alice ends phase-modulator is obtained according to interference curve The half-wave voltage of AliceAndFour phase operating points, then fix each operating point of Alice successively, and Bob is in certain voltage model Interior gradually on-load voltage is enclosed, a count curve for Single-photon interference is scanned respectively, and volume is calculated according to the result of interference curve Code matrix, phase compensation is finished if encoder matrix meets ideal coding matrix, otherwise, and Alice adjustment operating point, Bob is again Scanning Single-photon interference curve.In phase compensation procedure, the adjustment that Alice often carries out one action point is accomplished by Bob scannings 4 The count curve of Single-photon interference, increased time and the complexity of Active phase compensation process.Meanwhile, the phase of four phase methods is mended The process of repaying needs the both sides to carry out information exchange, however, (APC) is attacked in Active phase compensation can obtain each according to interactive information The definite phase information that photon is loaded,ThisNew back door may be opened to EVE.
The content of the invention
In view of this, the purpose of the embodiment of the present invention is to provide a kind of local Active phase compensation system and method, with Improve above mentioned problem.
In a first aspect, the invention provides a kind of local Active phase compensation system, including first laser light source, first swash Light modulation processing unit, the first light intensity detection device, the first controller, the first photoswitch, optical attenuator and second laser light Source, second laser modulation treatment device, the second light intensity detection device and second controller, first controller respectively with institute State the first light intensity detection device, first laser modulation treatment device electrical connection, the first laser modulation treatment device, institute The first photoswitch and the optical attenuator light connects successively are stated, the second controller is filled with second light intensity detection respectively Put, the second laser modulation treatment device is electrically connected,
When first photoswitch is off, the laser light incident that the first laser light source sends enters described One Laser Modulation processing unit；
First controller is used to control the first laser modulation treatment device to perform Laser Modulation into light pulse, And the pulsewidth of light pulse more than light pulse by the first long-armed optical fiber of interference ring and the first galianconism optical fiber when caused time Difference, is then divided into light pulse two beams and is transmitted with the first galianconism optical fiber along the first long-armed optical fiber respectively, and in transmitting procedure The middle multiple phase modulation voltages of loading carry out phase-modulation to a branch of light pulse along the first galianconism Optical Fiber Transmission, the light after phase-modulation The operation that pulse is interfered with not modulated light pulse；
First controller is additionally operable to receive the light after the interference for collecting of the first light intensity detection device output Multiple light intensity of pulse, and go out the first light pulse interference curve according to the multiple phase modulation voltage, the multiple Light Intensity Scanning, and Four the first operating points of first phase modulator are obtained according to the first light pulse interference curve；
The laser light incident that the second laser light source sends enters the second laser modulation treatment device；
The second controller is used to control the second laser modulation treatment device to perform Laser Modulation into light pulse, And the pulsewidth of light pulse more than light pulse by the second long-armed optical fiber of interference ring and the second galianconism optical fiber when caused time Difference, is then divided into light pulse two beams and is transmitted with the second galianconism optical fiber along the second long-armed optical fiber respectively, and in transmitting procedure In load multiple phase modulation voltages in transmitting procedure and carry out phase-modulation in a branch of light pulse of the transmission along the second galianconism optical fiber, After end of transmission, the operation that the light pulse after phase-modulation is interfered with not modulated light pulse；
The second controller is additionally operable to receive the light after the interference for collecting of the second light intensity detection device output Multiple light intensity of pulse, and go out the second light pulse interference curve according to the multiple phase modulation voltage, the multiple Light Intensity Scanning, and Four the second odd-job points of second phase modulator are obtained according to the second light pulse interference curve；
When first photoswitch is in closure state, first controller is additionally operable to described in secondary control again first and swashs Light modulation processing unit is performed Laser Modulation into light pulse, and the pulsewidth of light pulse is less than light pulse by the first of interference ring Caused time difference when long-armed optical fiber and the first galianconism optical fiber, light pulse is then divided into two beams respectively along the first long-armed optical fiber It is transmitted with the first galianconism optical fiber, it is fixed in transmitting procedure to load the corresponding phase modulation voltage pair in one of them first operating point Phase-modulation is carried out along a branch of light pulse of the transmission of the first galianconism optical fiber；
After the first long-armed optical fiber and the first galianconism Optical Fiber Transmission are finished, two-beam pulse enters after a Long haul fibers respectively It is incident upon the second laser modulation treatment device；
The second laser modulation treatment device is used to for two-beam pulse to be divided into four bundles light pulse along the second long-armed optical fiber It is transmitted with the second galianconism optical fiber, and multiple phase modulation voltages is loaded in transmitting procedure to elder generation along long-armed Optical Fiber Transmission, afterwards edge A branch of light pulse of the second galianconism optical fiber carries out phase-modulation, after end of transmission, make first along after the first long-armed Optical Fiber Transmission along the The light pulse of two galianconism Optical Fiber Transmissions with first along being interfered along the light pulse of the second long-armed optical fiber after the first galianconism optical fiber；
After the second controller is additionally operable to receive the interference for collecting that the second light intensity detection device is exported again The light pulse under multiple phase modulation voltages multiple light intensity, and swept according to the multiple phase modulation voltage, the multiple light intensity Joint light pulse interference curve is described, find out one from joint light pulse interference curve closes with one of them second odd-job point The corresponding point of phase modulation voltage of connection, and by joint light pulse interference curve with the phase modulation voltage for associating of the point and with the point The difference of the phase modulation voltage of corresponding second odd-job point association draws phase drift parameter, according to the phase drift parameter The the second odd-job point for adjusting second phase modulator obtains the second operating point, completes phase compensation procedure.
Second aspect, the embodiment of the present invention additionally provides a kind of local Active phase compensation method, is applied to local active Phase Compensation System, is applied to local Active phase compensation system, and the local Active phase compensation system includes first laser Light source, first laser modulation treatment device, the first light intensity detection device, the first controller, the first photoswitch, optical attenuator and Second laser light source, second laser modulation treatment device, the second light intensity detection device and second controller, first control Device is electrically connected with the first light intensity detection device, the first laser modulation treatment device respectively, the first laser modulation Processing unit, first photoswitch and the optical attenuator light connects successively, the second controller is respectively with described Two light intensity detection devices, second laser modulation treatment device electrical connection,
When first photoswitch is off, the laser light incident that the first laser light source sends enters described One Laser Modulation processing unit,
First controller controls the first laser modulation treatment device to perform Laser Modulation into light pulse, and light The pulsewidth of the pulse time difference caused when being more than pulse by the first long-armed optical fiber of fiber interferometer and the first galianconism optical fiber, Then light pulse is divided into two beams to be transmitted with the first galianconism optical fiber along the first long-armed optical fiber respectively, and is added in transmitting procedure Carry multiple phase modulation voltages carries out phase-modulation to a branch of light pulse along the first galianconism Optical Fiber Transmission, and makes the light after phase-modulation Pulse is interfered with not modulated light pulse；
First controller receives the light pulse after the interference for collecting of the first light intensity detection device output Multiple light intensity, and go out the first light pulse interference curve according to the multiple phase modulation voltage, the multiple Light Intensity Scanning, and obtain the Four the first operating points of one light pulse interference curve；
The laser light incident that the second laser light source sends enters the second laser modulation treatment device；
The second controller controls the second laser modulation treatment device to perform Laser Modulation into light pulse, and light The pulsewidth of the pulse time difference caused when being more than pulse by the second long-armed optical fiber of interference ring and the second galianconism optical fiber, then Light pulse is divided into two beams to be transmitted with the second galianconism optical fiber along the second long-armed optical fiber respectively, and in transmission in transmitting procedure During load multiple phase modulation voltages and carry out phase-modulation in a branch of light pulse of the transmission along the second galianconism optical fiber, transferring Bi Hou, the light pulse after phase-modulation is interfered with not modulated light pulse；
The second controller receives reception the second light intensity detection device of the second light intensity detection device output Multiple light intensity of the light pulse after the interference for collecting of output, and swept according to the multiple phase modulation voltage, the multiple light intensity The second light pulse interference curve is described, and obtains four the second odd-job points of the second light pulse interference curve；
When first photoswitch is in closure state, first controller first laser modulation described in secondary control again Processing unit is performed Laser Modulation into light pulse, and the pulsewidth of light pulse is less than first long-armed optical fiber of the pulse by interference ring Caused time difference during with the first galianconism optical fiber, light pulse is then divided into two beams short with first along the first long-armed optical fiber respectively Arm optical fiber is transmitted；And the corresponding phase modulation voltage in one of them first operating point of loading is fixed in transmitting procedure to along first A branch of light pulse of the transmission of galianconism optical fiber carries out phase-modulation；
After the first long-armed optical fiber and the first galianconism Optical Fiber Transmission are finished, two-beam pulse passes through through a Long haul fibers respectively The second laser modulation treatment device is incident to after the optical attenuator；
Two-beam pulse is divided into four bundles light pulse along the second long-armed optical fiber and by the second laser modulation treatment device Two galianconism optical fiber are transmitted, and multiple phase modulation voltages are loaded in transmitting procedure to elder generation along long-armed Optical Fiber Transmission, after along second A branch of light pulse of galianconism optical fiber carries out phase-modulation, after end of transmission, make first along after the first long-armed optical fiber along the second galianconism light Fine light pulse and elder generation along the light pulse of the second long-armed optical fiber after the first galianconism optical fiber along being interfered；
The second controller receives being in after the interference for collecting of the second light intensity detection device output again Multiple light intensity of the light pulse under multiple phase modulation voltages, and go out connection according to the multiple phase modulation voltage, the multiple Light Intensity Scanning Closing light pulse interference curve, a tune associated with one of them second odd-job point is found out from joint light pulse interference curve The corresponding point of phase voltage, and by joint light pulse interference curve with the phase modulation voltage of the association of the point and corresponding with the point The difference of phase modulation voltage of the second odd-job point association draws phase drift parameter, according to the phase drift parameter adjustment the Second odd-job point of two phase modulator obtains the second operating point, completes phase compensation procedure.
Compared with prior art, the present invention is provided a kind of local Active phase compensation system and method, due to signal hair The determination process of the operating point of sending end is completely locally completed, and the determination of signal receiving end odd-job point is also completely locally complete Into so as to avoid in classical transmission scanning result so that EVE cannot obtain phase information, improve security of system； Furthermore the local compensation of signal sending end and signal receiving end and hybrid compensation process scanning is intense light pulse interference curve, contracting Short sweep time, improve information dutycycle.
To enable the above objects, features and advantages of the present invention to become apparent, preferred embodiment cited below particularly, and coordinate Appended accompanying drawing, is described in detail below.
Brief description of the drawings
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is A part of embodiment of the present invention, rather than whole embodiments.Present invention implementation generally described and illustrated in accompanying drawing herein The component of example can be arranged and designed with a variety of configurations.Therefore, reality of the invention below to providing in the accompanying drawings The detailed description for applying example is not intended to limit the scope of claimed invention, but is merely representative of selected implementation of the invention Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made Every other embodiment, belongs to the scope of protection of the invention.
Fig. 1 is the structured flowchart of the first local Active phase compensation system provided in an embodiment of the present invention；
Fig. 2 is the second provided in an embodiment of the present invention structured flowchart of local Active phase compensation system；
Fig. 3~Fig. 6 is the second provided in an embodiment of the present invention flow chart of local Active phase compensation system.
Icon：101- first laser light sources；102- first laser modulation treatment devices；103- the first light intensity detection devices； The controllers of 104- first；The photoswitches of 105- first；106- optical attenuators；107- the first galianconism optical fiber；The long-armed optical fiber of 108- first； 109- Long haul fibers；The intensity modulators of 110- first；111- first phase modulators；The beam splitters of 112- first；113- first Photo-coupler；The faraday mirrors of 114- first；The faraday mirrors of 115- second；The single-photon detectors of 116- first；The monochromatic lights of 117- second Sub- detector；The smooth beam-splitting couplers of 118- first；201- second laser light sources；202- second laser modulation treatment devices；203- Second light intensity detection device；204- second controllers；The photoswitches of 205- second；206- the second galianconism optical fiber；207- second is long-armed Optical fiber；The intensity modulators of 208- second；209- second phase modulators；The beam splitters of 210- second；The photo-couplers of 211- second； The faraday mirrors of 212- the 3rd；The faraday mirrors of 213- the 4th；The photoswitches of 214- the 3rd；215- circulators；The smooth beam splitting couplings of 216- second Clutch.
Specific embodiment
Below in conjunction with accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Ground description, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.Generally exist The component of the embodiment of the present invention described and illustrated in accompanying drawing can be arranged and designed with a variety of configurations herein.Cause This, the detailed description of the embodiments of the invention to providing in the accompanying drawings is not intended to limit claimed invention below Scope, but it is merely representative of selected embodiment of the invention.Based on embodiments of the invention, those skilled in the art are not doing The every other embodiment obtained on the premise of going out creative work, belongs to the scope of protection of the invention.
Refer to Fig. 1, Fig. 2, a kind of local Active phase compensation system provided in an embodiment of the present invention, the local active phase Position compensation system includes first laser light source 101, first laser modulation treatment device 102, the first light intensity detection device 103, the One controller 104, the first photoswitch 105, optical attenuator 106 and second laser light source 201, second laser modulation treatment device 202nd, the second light intensity detection device 203 and second controller 204.First controller 104 respectively with the first light intensity detection device 103rd, first laser modulation treatment device 102 is electrically connected, first laser modulation treatment device 102, the first photoswitch and light decay Subtract the light connects successively of device 106, second controller 204 respectively with the second light intensity detection device 203, second laser modulation treatment device 202 electrical connections.
Wherein, first laser light source 101, first laser modulation treatment device 102, the first light intensity detection device 103, first Controller 104, the first photoswitch 105 constitute signal sending end, second laser light source 201, second laser modulation treatment device 202nd, the second light intensity detection device 203 and second controller 204 constitute signal receiving end.Information transmitting terminal obtains four work Point mode be：
When the first photoswitch 105 is off, the laser light incident that first laser light source sends enters first laser tune Processing unit processed 102.
First controller 104 is used to control first laser modulation treatment device 102 to perform Laser Modulation into light pulse, and The pulsewidth of light pulse more than pulse by the first long-armed optical fiber 108 of fiber interferometer with the first galianconism optical fiber 107 when it is caused Time difference, light pulse is then divided into two beams and is transmitted with the first galianconism optical fiber 107 along the first long-armed optical fiber 108 respectively, And the light arteries and veins that multiple phase modulation voltages make along the first galianconism Optical Fiber Transmission is loaded to the first phase modulator in transmitting procedure The phase of punching is modulated, the operation for making the light pulse after phase-modulation be interfered with not modulated light pulse.
Specifically, the structure of first laser modulation treatment device 102 and the control first laser modulation of the first controller 104 It is including but not limited to following two that processing unit 102 performs above-mentioned operation：
The first：
As shown in figure 1, fiber interferometer is Mach Zehnder interference ring, first laser modulation treatment device 102 includes the One intensity modulator 110, first phase modulator 111, the first beam splitter 112 and the first photo-coupler 113, the first control Device 104 is electrically connected with the first intensity modulator 110, first phase modulator 111 respectively.
First laser light source sends laser light incident and enters the first intensity modulator 110；
First controller 104 is used to controlling the first intensity modulator 110 by Laser Modulation into light pulse, and light pulse arteries and veins When caused when being wider than pulse by the first long-armed optical fiber 108 of Mach Zehnder interference ring and the first galianconism optical fiber 107 Between it is poor；
Optical pulse strikes after being modulated through the first intensity modulator 110 enter the first beam splitter 112, through the first beam splitter Light pulse is divided into two beams and is transmitted with the first galianconism optical fiber 107 along the first long-armed optical fiber 108 respectively after 112, and in transmission During the first controller 104 be used to control first phase modulator 111 to load multiple phase modulation voltages to along the first galianconism optical fiber The light pulse of 107 transmission carries out phase-modulation, and two-beam pulse enters to inject the first photo-coupler 113 and occurs to do after end of transmission Relate to.
Second：
As shown in Fig. 2 fiber interferometer is faraday's interference ring, first laser modulation treatment device 102 includes the last the first Degree modulator 110, first phase modulator 111, the first smooth beam-splitting coupler 118, the first faraday mirror 114, the second faraday Mirror 115, controller is electrically connected with the first intensity modulator 110, first phase modulator 111 respectively,
First laser light source sends laser light incident and enters the first intensity modulator 110, and the first controller 104 is used to control first Intensity modulator 110 is by Laser Modulation into light pulse, and the pulsewidth of light pulse is more than pulse by the first of faraday's interference ring Caused time difference during 108 and first galianconism optical fiber 107 of long-armed optical fiber；
Optical pulse strikes after being modulated through the first intensity modulator 110 enter the first smooth beam-splitting coupler 118, through the first light point Light pulse is divided into two beams and is transmitted with the first galianconism optical fiber 107 along the first long-armed optical fiber 108 respectively after bundle coupler 118, And the first controller 104 is used to control first phase modulator 111 to load multiple phase modulation voltages to along first in transmitting procedure A branch of light pulse of the transmission of galianconism optical fiber 107 carries out phase-modulation, and two-beam pulse is respectively through the first method after end of transmission Mirror 114, the second faraday mirror 115 is drawn to be reflected back the first smooth beam-splitting coupler 118 and interfere.
First controller 104 is additionally operable to receive multiple light intensity of the output of the first light intensity detection device 103, and is adjusted according to multiple Phase voltage, multiple Light Intensity Scannings go out the first light pulse interference curve, and obtain first phase according to the first light pulse interference curve Four the first operating points of modulator 111.
Wherein, four the first operating points are respectively the power maximum point in a cycle of the first light pulse interference curve Pa,max, power half value pointPower minimum point Pa,minThe corresponding phase modulation magnitude of voltage V of differencea,0、Va,πWith AndWherein Va,half=| Va,π-Va,0|。
Specifically, obtaining four modes of the first operating point can choose the first light pulse interference for the first controller 104 It is one between two light intensity value extreme points (being wherein a maximum point, another is minimum point) adjacent on curve Cycle.When light intensity is in maximum point pa,maxWhen, the phase difference of two light pulses now interfered is 0, also referred to as 0 phase point, correspondence Phase modulation voltage be denoted as Va,0；When light intensity is in minimum point pa,minWhen, the phase difference of two light pulses now interfered is π, also referred to as It is π phase points, corresponding phase modulation voltage is denoted as Va,π；The half-wave voltage of first phase modulator 111 is drawn according to 0 phase point and π phase points Va,half=| Va,π-Va,0|；When light intensity value takesWhen, the phase difference of two light pulses now interfered isAlso referred to as ForPhase point, corresponding phase modulation voltage is denoted asThus obtainThe corresponding phase modulation voltage of phase point is
Information receiving end obtain four the second odd-job points mode be：
The laser light incident that second laser light source sends enters second laser modulation treatment device 202.
Second controller 204 is used to control second laser modulation treatment device 202 to perform Laser Modulation into light pulse, and The pulsewidth of the light pulse time caused when being more than pulse by the second long-armed optical fiber of interference ring and the second galianconism optical fiber 206 Difference, is then divided into light pulse two beams and is transmitted with the second galianconism optical fiber 206 along the second long-armed optical fiber respectively, and be transmitted across Multiple phase modulation voltages are loaded in journey carries out phase-modulation to the light pulse transmitted along the second galianconism optical fiber 206, after end of transmission, The operation for making the light pulse after phase-modulation be interfered with not modulated light pulse.
Specifically, the structure of second laser modulation treatment device 202 and the control second laser modulation of second controller 204 It is including but not limited to following two that processing unit 202 performs above-mentioned operation：
The first：
As shown in figure 1, fiber interferometer is Mach Zehnder interference ring, second laser modulation treatment device 202 includes the Two intensity modulators 208, second phase modulator 209, the second beam splitter 210 and the second photo-coupler 211, the second control Device 204 is electrically connected with the second intensity modulator 208, second phase modulator 209 respectively,
Second laser light source sends laser light incident and enters the second intensity modulator 208,
Second controller 204 is used to control the second intensity modulator 208 by Laser Modulation into light pulse, and light pulse arteries and veins When caused when being wider than pulse by the second long-armed optical fiber 207 of Mach Zehnder interference ring and the second galianconism optical fiber 206 Between it is poor；
Optical pulse strikes after being modulated through the second intensity modulator 208 enter the second beam splitter 210, through the second beam splitter Light pulse is divided into two beams and is transmitted with the second galianconism optical fiber 206 along the second long-armed optical fiber 207 respectively after 210, and in transmission During second controller 204 be used for control second phase modulator 209 to load multiple phase modulation voltages to along the second galianconism optical fiber The light pulse of 206 transmission carries out phase-modulation, and after end of transmission, two-beam pulse enters to inject the second photo-coupler 211 and sends out Raw interference.
Second：
As shown in Fig. 2 fiber interferometer is faraday's interference ring, second laser modulation treatment device 202 includes the last the second Degree modulator 208, second phase modulator 209, the second smooth beam-splitting coupler 216, circulator 215, the second photoswitch 205, the Three faraday mirrors 212 and the 4th faraday mirror 213, second controller 204 respectively with the second intensity modulator 208, the second phase Position modulator 209 is electrically connected.
First photoswitch 105 is off, and the second photoswitch 205 is in and switches to and the second intensity modulator 208 Connect and the 3rd photoswitch 214 switched to when being connected with the second light intensity detection device 203,
Second laser light source sends laser light incident and enters the second intensity modulator 208,
Second controller 204 is used to control the second intensity modulator 208 by Laser Modulation into light pulse, and light pulse arteries and veins Caused time difference when being wider than pulse by the second long-armed optical fiber 207 of faraday's interference ring and the second galianconism optical fiber 206；
Optical pulse strikes after being modulated through the second intensity modulator 208 enter the second smooth beam-splitting coupler 216, through the second light point Light pulse is divided into two beams and is transmitted with 207 second galianconism optical fiber 206 along the second long-armed optical fiber respectively after bundle coupler 216, And second controller 204 is used to control second phase modulator 209 to load multiple phase modulation voltages to along second in transmitting procedure The light pulse of the transmission of galianconism optical fiber 206 carries out phase-modulation, and two-beam pulse is respectively through the 3rd faraday mirror after end of transmission 212nd, the 4th faraday mirror 213 is reflected back the second smooth beam-splitting coupler 216 and interferes.
Second controller 204 is used to receive multiple of the output of the second light intensity detection device 203 under multiple phase modulation voltages Light intensity, and go out the second light pulse interference curve, and interfered according to the second light pulse according to multiple phase modulation voltages, multiple Light Intensity Scannings Four the second odd-job points of curve acquisition second phase modulator.
Wherein, the power that four the second odd-job points are respectively in a cycle of the second light pulse interference curve is very big Value point Pb,max, power half value pointPower minimum point Pb,minThe corresponding phase modulation magnitude of voltage V of differenceb,0、 Vb,πAndWherein Vb,half=| Vb,π-Vb,0|。
The mode that the corresponding phase modulation voltage of four the second odd-job points is obtained is identical with the mode of four the first operating points, It is just no longer herein to repeat more.
Close second laser light source 201, the first photoswitch 105 in closure state, the second photoswitch 205 switch to Long haul fibers 109 are connected, the 3rd photoswitch 214 is switched to when being connected with the second light intensity detection device, and the first controller 104 is also used Performed Laser Modulation into light pulse in control first laser modulation treatment device 102 again, and the pulsewidth of light pulse is less than light Pulse by interference ring the first long-armed optical fiber 108 and the first galianconism optical fiber 107 caused by time difference, then by light pulse point For two beams are transmitted along the first long-armed optical fiber 108 with the first galianconism optical fiber 107 respectively；To first phase in transmitting procedure The phase modulation voltage that position modulator 111 is fixed in the first operating point of loading makes the light pulse along the Optical Fiber Transmission of the first galianconism 107 Phase is modulated.
Specifically, the first controller 104 performs the mode of aforesaid operations also including two kinds, please specifically respectively refer to above-mentioned The control first laser modulation treatment of first controller 104 device 102 performs above-mentioned operation, just no longer herein to repeat more.
After the first long-armed optical fiber 108 and the end of transmission of the first galianconism optical fiber 107, two-beam pulse is respectively through a long-range light Fine 109 after optical attenuator 106 by being incident to second laser modulation treatment device 202；Second laser modulation treatment device 202 is used It is transmitted with the second galianconism optical fiber 206 along the second long-armed optical fiber 207 in two-beam pulse is divided into four bundles light pulse, and is being passed Multiple phase modulation voltages are loaded during defeated to transmit elder generation along the first long-armed optical fiber 108, after along the second galianconism optical fiber 206 light beam Pulse carries out phase-modulation, after end of transmission, by elder generation along the light transmitted along the second galianconism optical fiber 206 after the first long-armed optical fiber 108 Pulse with first along being interfered along the light pulse of the second long-armed optical fiber 207 after the first galianconism optical fiber 107.
Second controller 204 be additionally operable to receive again the output of the second light intensity detection device 203 in multiple phase modulation voltages Under multiple light intensity, and go out joint light pulse interference curve according to multiple phase modulation voltages, multiple Light Intensity Scannings.From joint light pulse Interference curve finds out a point corresponding with the phase modulation voltage that one of them second odd-job point is associated, and by combining light arteries and veins Rush the phase modulation voltage associated with the phase modulation voltage of the association of the point and the second odd-job point corresponding with the point on interference curve Difference draw phase drift parameter, according to the second casual labour of the phase drift parameter adjustment second phase modulator 209 Make point and obtain the second operating point, complete phase compensation procedure.
It should be noted that in the present embodiment, the first light intensity detection device 103 or the second light intensity detection device 203 For photodetector or the single-photon detector in linear operation mode.
After phase compensation is finished, the mode for carrying out key distribution can be when fiber interferometer be faraday's interference ring when, The process of key distribution is as follows：
First, it is assumed that：
The phase modulation magnitude of voltage V of transmitting terminala,0,Represent logical bits 0, Va,π,Represent logical bits 1；
Receiving terminal fromMiddle random selection phase modulation voltage-drop loading phase；
When the phase difference of two pulses 3. met at the second smooth beam-splitting coupler is 0, if wherein the first single photon detection Device 116 is responded, then receiving terminal it is counter push away transmitting terminal send be bit 0；Two pulses met at the second smooth beam-splitting coupler Phase difference when being π, if the second single-photon detector 116 is responded, receiving terminal is counter push away transmitting terminal sends is bit 1.
The first step, the first photoswitch 105 switches to the place light path of optical attenuator 106, and the second photoswitch 205 switches to long-range Light path where optical fiber 109, the 3rd photoswitch 214 switch to the first single-photon detector where light path, make the first single photon Detector 116, the second single-photon detector 117 are operated in Geiger mode angular position digitizer, and close the second laser light source 201 of receiving terminal.
Second step, transmitting terminal re-modulates light impulse length in the manner described above, and the first controller 104 controls pulsewidth, and The pulsewidth of light pulse more than light pulse by interference ring the first long-armed optical fiber 108 and the first galianconism optical fiber 107 caused by when Between it is poor.Then optical pulse strikes enter the first smooth beam-splitting coupler 118 and are divided into two pulses, and the first long-armed optical fiber 108 is walked respectively With the first galianconism optical fiber 107, then two-beam pulse reflects latter previous by the first faraday mirror 114, the second faraday mirror 115 After be again introduced into the first smooth beam-splitting coupler 118.First controller 104 randomly chooses four previously determined the first operating pointsIn any one phase modulation voltage, to by first phase modulator 111 light pulse modulate a phase PositionAndIt is 0,π, orProbability be impartial.Two light pulses go out from the first smooth beam-splitting coupler 118 Come, one in front and one in back through optical attenuator 106, Long haul fibers 109 and and the second smooth beam-splitting coupler 113 so that two light pulses Four pulses are divided into, the second long-armed optical fiber 207 and the second galianconism optical fiber 206 of faraday's interference ring are walked respectively, finally quilt 3rd faraday mirror 212 and the 4th faraday mirror 213 are reflected back the second smooth beam-splitting coupler216.Second control of receiving terminal Device 204 randomly chooses the second operating pointIn an arbitrary phase modulation voltage, to one in front and one in back twice by second A phase is modulated in two light pulses of phase-modulator 209AndIt is 0, orProbability be impartial.Four Got ahead in pulse the first long-armed optical fiber 108, after walk the second galianconism optical fiber 206 pulse and the first galianconism optical fiber 107 that gets ahead, after walk The phase difference of the pulse of the second long-armed optical fiber 207And two pulse at the second smooth beam-splitting coupler 216 do Relate to, the pulse signal after interference can respond the first single-photon detector 116 or the second single-photon detector 117.
3rd step：Obtain primary key.
WhenWhen, if the first single-photon detector 116 is responded, according to assumed condition then it is counter push away transmitting terminal send It is bit 0；WhenWhen, if the second single-photon detector 117 is responded, according to assumed condition then it is counter push away transmitting terminal send It is bit 1.Thus, receiving terminal combines the response condition of the first single-photon detector 116 or the second single-photon detector, obtains original Beginning key.
4th step：To base.
The phase information that receiving terminal is modulated second phase modulator 209 is sent to transmitting terminal by classical channel, sends out Sending end will meetWithThe sequence number of bit be sent to receiving terminal, both sides only retain the corresponding Bit String of sequence number, So as to obtain screening code.
5th step：Error code is estimated.
N number of bit in receiving terminal random selection screening code is sent to transmitting terminal by classics channel, and transmitting terminal is by mistake The number n of bit informs receiving terminal, obtains estimating bit error rateWhen bit error rate p >=11%, communication failure is re-started Key is distributed, as bit error rate p<11%, carry out quantum key distribution post processing.
6th step：Quantum key distribution is post-processed
Transmitting terminal and receiving terminal use error correction algorithm, and information exchange is carried out by classical channel, by receiving terminal screening code Error correcting；Key after consulting in order to ensure transmitting terminal and receiving terminal is completely the same, and both sides can be by classical channel ratio To cryptographic Hash.If cryptographic Hash is identical, then it is assumed that key agreement；Otherwise, re-start key distribution or proceed key agreement； The factors such as the information interaction amount according to bit error rate estimation, distribution of light sources estimation, security of system demand and cipher key agreement process are entered Row comprehensive assessment, obtains the compressibility factor that secrecy is amplified, and the bit after key agreement is compressed, and final acquisition safety is close Key.
Fig. 3, Fig. 4, Fig. 5, Fig. 6 are referred to, the embodiment of the present invention additionally provides a kind of local Active phase compensation method, should For local Active phase compensation system.It should be noted that the local Active phase compensation method that the present embodiment is provided, its General principle and the technique effect of generation are identical with above-described embodiment, and to briefly describe, the present embodiment part does not refer to part, can With reference to corresponding contents in the above embodiments.
The local Active phase compensation system includes first laser light source 101, first laser modulation treatment device 102, the One light intensity detection device 103, the first controller 104, the first photoswitch 105, optical attenuator 106 and second laser light source 201, Second laser modulation treatment device 202, the second light intensity detection device 203 and second controller 204.First 104 points of controller Do not electrically connected with the first light intensity detection device 103, first laser modulation treatment device 102, first laser modulation treatment device 102nd, the first photoswitch 105 and optical attenuator 106 light connects successively, second controller 204 is filled with the second light intensity detection respectively 203, second laser modulation treatment device 202 is put to electrically connect.As shown in figure 3, the light pulse phase compensation step includes：
Step S401：When the first photoswitch 105 is off, the laser light incident that first laser light source sends enters One Laser Modulation processing unit 102.
Step S402：First controller 104 controls first laser modulation treatment device 102 by Laser Modulation into light pulse, Then light pulse is divided into two beams, is transmitted with the first galianconism optical fiber 107 along the first long-armed optical fiber 108 respectively.
When the pulsewidth of light pulse is more than light pulse by the first long-armed optical fiber 108 of interference ring and the first galianconism optical fiber 107 The caused time difference.
Step S403：First laser modulation treatment device 102 loads multiple phase modulation voltages to along the first galianconism Optical Fiber Transmission A branch of light pulse carry out phase-modulation, and the light pulse after phase-modulation is interfered with not modulated light pulse.
Step S404：First controller 104 receive the first light intensity detection device 103 output under multiple phase modulation voltages Multiple light intensity.
Step S405：First controller 104 goes out the first light pulse interference song according to multiple phase modulation voltages, multiple Light Intensity Scannings Line, and four the first operating points of first phase modulator are obtained according to the first light pulse interference curve.
As shown in figure 4, the light pulse phase compensation step also includes：
Step S406：The laser light incident that second laser light source 201 sends enters second laser modulation treatment device 202.
Step S407：Second controller 204 controls second laser modulation treatment device 202 by Laser Modulation into light pulse, Then light pulse is divided into two beams, is transmitted with the second galianconism optical fiber 206 along the second long-armed optical fiber 207 respectively.
The pulsewidth of light pulse is more than second long-armed optical fiber 207 and second galianconism optical fiber 206 institute of the light pulse by interference ring The time difference for causing.
Step S408：Second laser modulation treatment device 202 loads many to second phase modulator 209 in transmitting procedure Individual phase modulation voltage is modulated the phase of the light pulse transmitted along the second galianconism optical fiber 206, after end of transmission, phase is adjusted Light pulse after system is interfered with not modulated light pulse.
Step S409：Being adjusted in multiple after the interference of the reception output of the second light intensity detection device 203 of second controller 204 Multiple light intensity under phase voltage.
Step S410：Second controller 204 goes out the second light pulse interference song according to multiple phase modulation voltages, multiple Light Intensity Scannings Line, and four the second odd-job points of second phase modulator are obtained according to the second light pulse interference curve.
As shown in figure 5, the light pulse phase compensation step also includes：
Step S411：When the first photoswitch 105 is in closure state, the first controller 104 controls first laser again Light pulse is divided into two beams respectively along the first long-armed optical fiber 108 and by Laser Modulation into light pulse by modulation treatment device 102 One galianconism optical fiber 107 is transmitted.
The pulsewidth of light pulse is less than first long-armed optical fiber 108 and first galianconism optical fiber 107 institute of the light pulse by interference ring The time difference for causing.
Step S412：First laser modulation treatment device 102 is fixed to first phase modulator 111 and added in transmitting procedure Carrying a phase modulation voltage in the first operating point is modulated the light pulse phase transmitted along the first galianconism optical fiber 107.
Step S413：After the first long-armed optical fiber 108 and the end of transmission of the first galianconism optical fiber 107, two-beam pulse difference Through a Long haul fibers 109 by being incident to second laser modulation treatment device 202 after optical attenuator 106.
Step S414：It is long-armed along second that two-beam pulse is divided into four bundles light pulse by second laser modulation treatment device 202 Optical fiber 207 is transmitted with the second galianconism optical fiber 206.
Step S415：Second laser modulation treatment device 202 loads many to second phase modulator 209 in transmitting procedure Individual phase modulation voltage is modulated the phase of the light pulse transmitted along the second galianconism optical fiber 207.
As shown in fig. 6, the light pulse phase compensation step also includes：
Step S416：After end of transmission, by elder generation along the light pulse after the first long-armed optical fiber 108 along the second galianconism optical fiber 206 With elder generation along being interfered along the light pulse of the second long-armed optical fiber after the first galianconism optical fiber 107.
Step S417：Second controller 204 receives the electric in multiple phase modulation of the output of the second light intensity detection device 203 again Multiple light intensity of pressure.
Step S418：Second controller 204 goes out joint light pulse interference song according to multiple phase modulation voltages, multiple Light Intensity Scannings Line.
Step S419：During second controller 204 finds out one and the second odd-job point from joint light pulse interference curve The corresponding point of a phase modulation voltage.
Step S420：Second controller 204 is by the magnitude of voltage of the point on joint light pulse interference curve and corresponds to therewith The difference of phase modulation magnitude of voltage of the second odd-job point draw phase drift parameter, according to the phase drift parameter adjustment Second odd-job point of two phase modulator 209 obtains the second operating point, completes phase compensation procedure.
In sum, the present invention is provided a kind of local Active phase compensation system and method, due to signal sending end Odd-job point process is completely locally completed, and the determination of signal receiving end odd-job point is also completely locally completed, so that Avoid in classical transmission scanning result so that EVE cannot obtain phase information, improve security of system；Furthermore letter The local compensation of number transmitting terminal and signal receiving end and hybrid compensation process scanning are intense light pulse interference curves, shorten and sweep The time is retouched, information dutycycle is improve.
In several embodiments provided herein, it should be understood that disclosed device and system, it is also possible to pass through Other modes are realized.Device embodiment described above is only schematical, for example, flow chart and block diagram in accompanying drawing Show device, system and the computer program product of multiple embodiments of the invention architectural framework in the cards, Function and operation.At this point, each square frame in flow chart or block diagram can represent one the one of module, program segment or code Part, the executable finger of the logic function of the part comprising one or more realization regulations of the module, program segment or code Order.It should also be noted that in some are as the implementation replaced, the function of being marked in square frame can also be with different from accompanying drawing Middle marked order occurs.For example, two continuous square frames can essentially be performed substantially in parallel, they sometimes can also Perform in the opposite order, this is depending on involved function.It is also noted that each side in block diagram and/or flow chart The combination of the square frame in frame and block diagram and/or flow chart, can be with the function or action for performing regulation it is special based on hard The system of part is realized, or can be realized with the combination of computer instruction with specialized hardware.
In addition, each functional module in each embodiment of the invention can integrate to form an independent portion Divide, or modules individualism, it is also possible to which two or more modules are integrated to form an independent part.
If the function is to realize in the form of software function module and as independent production marketing or when using, can be with Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment (can be individual People's computer, server, or network equipment etc.) all or part of step of system described in execution each embodiment of the invention. And foregoing storage medium includes：USB flash disk, mobile hard disk, read-only storage (ROM, Read-Only Memory), arbitrary access are deposited Reservoir (RAM, Random Access Memory), magnetic disc or CD etc. are various can be with the medium of store program codes.Need Illustrate, herein, such as first and second or the like relational terms be used merely to by an entity or operation with Another entity or operation make a distinction, and not necessarily require or imply these entities or there is any this reality between operating The relation or order on border.And, term " including ", "comprising" or its any other variant be intended to the bag of nonexcludability Contain, so that process, system, article or equipment including a series of key elements are not only including those key elements, but also including Other key elements being not expressly set out, or it is this process, system, article or the intrinsic key element of equipment also to include. In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that including the key element Process, system, article or equipment in also there is other identical element.
The preferred embodiments of the present invention are the foregoing is only, the present invention is not intended to limit, for those skilled in the art For member, the present invention can have various modifications and variations.All any modifications within the spirit and principles in the present invention, made, Equivalent, improvement etc., should be included within the scope of the present invention.It should be noted that：Similar label and letter are under Similar terms is represented in the accompanying drawing in face, therefore, once be defined in a certain Xiang Yi accompanying drawing, then need not in subsequent accompanying drawing It is further defined and is explained.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain Cover within protection scope of the present invention.Therefore, protection scope of the present invention described should be defined by scope of the claims.
It should be noted that herein, such as first and second or the like relational terms are used merely to a reality Body or operation make a distinction with another entity or operation, and not necessarily require or imply these entities or deposited between operating In any this actual relation or order.And, term " including ", "comprising" or its any other variant be intended to Nonexcludability is included, so that process, system, article or equipment including a series of key elements not only will including those Element, but also other key elements including being not expressly set out, or also include being this process, system, article or equipment Intrinsic key element.In the absence of more restrictions, the key element limited by sentence "including a ...", it is not excluded that Also there is other identical element in process, system, article or equipment including the key element.

Claims (10)

1. a kind of local Active phase compensation system, it is characterised in that the local Active phase compensation system includes that first swashs Radiant, first laser modulation treatment device, the first light intensity detection device, the first controller, the first photoswitch, optical attenuator with And second laser light source, second laser modulation treatment device, the second light intensity detection device and second controller, first control Device processed is electrically connected with the first light intensity detection device, the first laser modulation treatment device respectively, and the first laser is adjusted Processing unit processed, first photoswitch and the optical attenuator light connects successively, the second controller respectively with it is described Second light intensity detection device, second laser modulation treatment device electrical connection,
When first photoswitch is off, the laser light incident that the first laser light source sends enters described first and swashs Light modulation processing unit；
First controller is used to control the first laser modulation treatment device to perform Laser Modulation into light pulse, and light The pulsewidth of the pulse time caused when being more than light pulse by the first long-armed optical fiber of fiber interferometer and the first galianconism optical fiber Difference, is then divided into light pulse two beams and is transmitted with the first galianconism optical fiber along the first long-armed optical fiber respectively, and in transmitting procedure The middle multiple phase modulation voltages of loading carry out phase-modulation to a branch of light pulse along the first galianconism Optical Fiber Transmission, the light after phase-modulation The operation that pulse is interfered with not modulated light pulse；
First controller is additionally operable to receive the light pulse after the interference for collecting of the first light intensity detection device output Multiple light intensity, and go out the first light pulse interference curve according to the multiple phase modulation voltage, the multiple Light Intensity Scanning, and according to First light pulse interference curve obtains four the first operating points of first phase modulator；
The laser light incident that the second laser light source sends enters the second laser modulation treatment device；
The second controller is used to control the second laser modulation treatment device to perform Laser Modulation into light pulse, and light The pulsewidth of the pulse time difference caused when being more than light pulse by the second long-armed optical fiber of interference ring and the second galianconism optical fiber, so Light pulse is divided into two beams afterwards to be transmitted with the second galianconism optical fiber along the second long-armed optical fiber respectively, and is loaded in transmitting procedure Multiple phase modulation voltages carry out phase-modulation, after end of transmission, phase in a branch of light pulse to the transmission along the second galianconism optical fiber The operation that light pulse after the modulation of position is interfered with not modulated light pulse；
The second controller is additionally operable to receive the light pulse after the interference for collecting of the second light intensity detection device output Multiple light intensity, and go out the second light pulse interference curve according to the multiple phase modulation voltage, the multiple Light Intensity Scanning, and according to Second light pulse interference curve obtains four the second odd-job points of second phase modulator；
When first photoswitch is in closure state, first controller is additionally operable to first laser described in secondary control again and adjusts Processing unit processed is performed Laser Modulation into light pulse, and light pulse pulsewidth less than light pulse by the first long-armed of interference ring Caused time difference when optical fiber and the first galianconism optical fiber, light pulse is then divided into two beams respectively along the first long-armed optical fiber and One galianconism optical fiber is transmitted, and the fixed corresponding phase modulation voltage in one of them first operating point that loads is to along the in transmitting procedure A branch of light pulse of the transmission of one galianconism optical fiber carries out phase-modulation；
After the first long-armed optical fiber and the first galianconism Optical Fiber Transmission are finished, two-beam pulse is incident to after a Long haul fibers respectively The second laser modulation treatment device；
The second laser modulation treatment device is used to for two-beam pulse to be divided into four bundles light pulse along the second long-armed optical fiber and the Two galianconism optical fiber are transmitted, and multiple phase modulation voltages are loaded in transmitting procedure to elder generation along long-armed Optical Fiber Transmission, after along second A branch of light pulse of galianconism optical fiber carries out phase-modulation, after end of transmission, makes first along short along second after the first long-armed Optical Fiber Transmission The light pulse of arm Optical Fiber Transmission with first along being interfered along the light pulse of the second long-armed optical fiber after the first galianconism optical fiber；
The second controller is additionally operable to receive again the place after the interference for collecting of the second light intensity detection device output In multiple light intensity of the light pulse under multiple phase modulation voltages, and go out according to the multiple phase modulation voltage, the multiple Light Intensity Scanning Joint light pulse interference curve, finds out one and associates with one of them second odd-job point from joint light pulse interference curve The corresponding point of phase modulation voltage, and by joint light pulse interference curve with the phase modulation voltage of the association of the point and corresponding with the point The difference of phase modulation voltage of the second odd-job point association draw phase drift parameter, according to the phase drift parameter adjustment Second odd-job point of second phase modulator obtains the second operating point, completes phase compensation procedure.
2. local Active phase compensation system according to claim 1, it is characterised in that the fiber interferometer is horse Conspicuous-Zeng Deer interference rings, the first laser modulation treatment device includes the first intensity modulator, first phase modulator, the One beam splitter and the first photo-coupler, the controller respectively with first intensity modulator, first phase modulator Electrical connection,
The first laser light source sends laser light incident and enters first intensity modulator,
First controller is used to control first intensity modulator by Laser Modulation into light pulse, and light pulse pulsewidth Caused time difference during more than pulse by the first long-armed optical fiber of Mach Zehnder interference ring and the first galianconism optical fiber；
Optical pulse strikes after being modulated through first intensity modulator enter first beam splitter, through the described first smooth beam splitting Light pulse is divided into two beams and is transmitted with the first galianconism optical fiber along the first long-armed optical fiber respectively after device, and right in transmitting procedure The multiple phase modulation voltages of first phase modulator loading are modulated the phase of the light pulse along the first galianconism Optical Fiber Transmission, Two-beam pulse enters to inject the first photo-coupler and interferes after end of transmission.
3. local Active phase compensation system according to claim 1, it is characterised in that the fiber interferometer is horse Conspicuous-Zeng Deer interference rings, the second laser modulation treatment device includes the second intensity modulator, second phase modulator, the Two beam splitters and the second photo-coupler, the second controller are adjusted with second intensity modulator, second phase respectively Device electrical connection processed,
The second laser light source sends laser light incident and enters second intensity modulator,
The second controller is used to control second intensity modulator by Laser Modulation into light pulse, and light pulse pulsewidth Caused time difference during more than pulse by the second long-armed optical fiber of Mach Zehnder interference ring and the second galianconism optical fiber；
Optical pulse strikes after being modulated through second intensity modulator enter second beam splitter, through the described second smooth beam splitting Light pulse is divided into two beams and is transmitted with the second galianconism optical fiber along the second long-armed optical fiber respectively after device, and right in transmitting procedure The second phase modulator loading phase modulation voltage makes to be modulated along the light pulse phase of the second galianconism Optical Fiber Transmission, in transmission After finishing, two-beam pulse enters to inject the second photo-coupler and interferes.
4. local Active phase compensation system according to claim 3, it is characterised in that the second controller is used to control Second intensity modulator is made by Laser Modulation into light pulse, and the pulsewidth of light pulse is less than pulse by Mach-Zehnder Caused time difference when the second long-armed optical fiber of interference ring and the second galianconism optical fiber；
After the first long-armed optical fiber and the first galianconism Optical Fiber Transmission are finished, two-beam pulse is incident to through a Long haul fibers respectively Two-beam pulse is divided into four bundles light pulse respectively along the second long-armed optical fiber and second by two beam splitters, second beam splitter Galianconism optical fiber is transmitted, and the multiple phase modulation voltages of second phase modulator loading are made first along first in transmitting procedure Modulated along the phase of the light pulse of the second galianconism Optical Fiber Transmission after long-armed optical fiber, second light is incident to after end of transmission Coupler, at second photo-coupler first along the first long-armed optical fiber after along the second galianconism optical fiber light pulse with first along first Interfered along the light pulse of the second long-armed optical fiber after galianconism optical fiber.
5. local Active phase compensation system according to claim 1, it is characterised in that the fiber interferometer is farad Interference ring, the first laser modulation treatment device includes the first intensity modulator, first phase modulator, the first smooth beam splitting Coupler, the first faraday mirror, the second faraday mirror, the first phase modulator are the unrelated phase-modulator of polarization, described Controller is electrically connected with first intensity modulator, first phase modulator respectively,
The first laser light source sends laser light incident and enters first intensity modulator,
First controller is used to control first intensity modulator by Laser Modulation into light pulse, and light pulse pulsewidth Caused time difference during more than pulse by the first long-armed optical fiber of faraday's interference ring and the first galianconism optical fiber；
Optical pulse strikes after being modulated through first intensity modulator enter the described first smooth beam-splitting coupler, through first light Light pulse is divided into two beams and is transmitted with the first galianconism optical fiber along the first long-armed optical fiber respectively after beam-splitting coupler, and in transmission During multiple phase modulation voltages loaded to the first phase modulator make the phase of the light pulse along the first galianconism Optical Fiber Transmission Modulated, two-beam pulse is reflected back the first light point through the first faraday mirror, the second faraday mirror respectively after end of transmission Bundle coupler is interfered.
6. local Active phase compensation system according to claim 1, it is characterised in that the fiber interferometer is farad Interference ring, the second laser modulation treatment device includes the second intensity modulator, second phase modulator, the second smooth beam splitting Coupler, the 3rd faraday mirror and the 4th faraday mirror, the second phase modulator are the unrelated phase-modulator of polarization, institute Second controller is stated to be electrically connected with second intensity modulator, second phase modulator respectively,
The second laser light source sends laser light incident and enters second intensity modulator,
The second controller is used to control second intensity modulator by Laser Modulation into light pulse, and light pulse pulsewidth Caused time difference during more than pulse by the second long-armed optical fiber of faraday's interference ring and the second galianconism optical fiber；
Optical pulse strikes after being modulated through second intensity modulator enter the described second smooth beam-splitting coupler, through second light Light pulse is divided into two beams and is transmitted with the second galianconism optical fiber along the second long-armed optical fiber respectively after beam-splitting coupler, and in transmission During to the second phase modulator loading phase modulation voltage make to be adjusted along the light pulse phase of the second galianconism Optical Fiber Transmission System, after end of transmission, two-beam pulse is reflected back the second smooth beam splitting and couples through the 3rd faraday mirror, the 4th faraday mirror respectively Device is interfered.
7. local Active phase compensation system according to claim 1, it is characterised in that four first operating points point Not Wei the first light pulse interference curve be in 0 phase, pi/2 phase, π phases and 3 pi/2 phase when distinguish corresponding four first Phase modulation magnitude of voltage, wherein, 0 phase is the first phase modulation magnitude of voltage correspondence when light intensity value in a cycle is maximum Phase, the π phases are the corresponding phase of the first phase modulation magnitude of voltage when light intensity value in a cycle is minimum, institute It is when the light intensity value in a cycle is the half value point in the middle of maximum and minimum to state pi/2 phase, 3 pi/2 phases One phase modulation magnitude of voltage distinguishes corresponding phase.
8. local Active phase compensation system according to claim 1, it is characterised in that four second odd-jobs Point is respectively when the second light pulse interference curve is in 0 phase, pi/2 phase, π phases and 3 pi/2 phase distinguishes corresponding four Second phase modulation magnitude of voltage, wherein, 0 phase is the second phase modulation magnitude of voltage when light intensity value in a cycle is maximum Corresponding phase, the π phases are the corresponding phase of the second phase modulation magnitude of voltage when light intensity value in a cycle is minimum Position, the pi/2 phase, 3 pi/2 phases are that light intensity value in a cycle is half value point in the middle of maximum and minimum When the corresponding phase of the second phase modulation magnitude of voltage.
9. local Active phase compensation system according to claim 1, it is characterised in that the first light intensity detection device Or second light intensity detection device be photodetector or the single-photon detector in linear operation mode.
10. a kind of local Active phase compensation method, it is characterised in that be applied to local Active phase compensation system, described Active Phase Compensation System in ground includes first laser light source, first laser modulation treatment device, the first light intensity detection device, first Controller, the first photoswitch, optical attenuator and second laser light source, second laser modulation treatment device, the second light intensity detection Device and second controller, first controller are modulated with the first light intensity detection device, the first laser respectively Processing unit is electrically connected, the first laser modulation treatment device, first photoswitch and the optical attenuator light successively Connection, the second controller is electrically connected with the second light intensity detection device, the second laser modulation treatment device respectively,
When first photoswitch is off, the laser light incident that the first laser light source sends enters described first and swashs Light modulation processing unit,
First controller controls the first laser modulation treatment device to perform Laser Modulation into light pulse, and light pulse Pulsewidth more than pulse by the first long-armed optical fiber of fiber interferometer and the first galianconism optical fiber when caused time difference, then Light pulse is divided into two beams to be transmitted with the first galianconism optical fiber along the first long-armed optical fiber respectively, is loaded in transmitting procedure multiple Phase modulation voltage carries out phase-modulation to a branch of light pulse along the first galianconism Optical Fiber Transmission, and make the light pulse after phase-modulation with Not modulated light pulse is interfered；
First controller receives the multiple of the light pulse after the interference for collecting of the first light intensity detection device output Light intensity, and go out the first light pulse interference curve according to the multiple phase modulation voltage, the multiple Light Intensity Scanning, and obtain the first light Four the first operating points of pulse interference curve；
The laser light incident that the second laser light source sends enters the second laser modulation treatment device；
The second controller controls the second laser modulation treatment device to perform Laser Modulation into light pulse, and light pulse Pulsewidth more than pulse by the second long-armed optical fiber of interference ring and the second galianconism optical fiber when caused time difference, then by light Pulse is divided into two beams and is transmitted with the second galianconism optical fiber along the second long-armed optical fiber respectively, and multiple phase modulation are loaded in transmitting procedure Voltage carries out phase-modulation in a branch of light pulse to the transmission along the second galianconism optical fiber, after end of transmission, by phase-modulation Light pulse afterwards is interfered with not modulated light pulse；
The second controller receives reception the second light intensity detection device output of the second light intensity detection device output The interference for collecting after light pulse multiple light intensity, and go out according to the multiple phase modulation voltage, the multiple Light Intensity Scanning Second light pulse interference curve, and obtain four the second odd-job points of the second light pulse interference curve；
When first photoswitch is in closure state, first controller first laser modulation treatment described in secondary control again Device is performed Laser Modulation into light pulse, and light pulse pulsewidth less than pulse by the first long-armed optical fiber of interference ring and the Caused time difference during one galianconism optical fiber, light pulse is then divided into two beams respectively along the first long-armed optical fiber and the first galianconism light Fibre is transmitted；And the corresponding phase modulation voltage in one of them first operating point of loading is fixed in transmitting procedure to along the first galianconism A branch of light pulse of the transmission of optical fiber carries out phase-modulation；
After the first long-armed optical fiber and the first galianconism Optical Fiber Transmission are finished, two-beam pulse is respectively through a Long haul fibers by described The second laser modulation treatment device is incident to after optical attenuator；
It is short with second along the second long-armed optical fiber that two-beam pulse is divided into four bundles light pulse by the second laser modulation treatment device Arm optical fiber is transmitted, and multiple phase modulation voltages are loaded in transmitting procedure to elder generation along long-armed Optical Fiber Transmission, after along the second galianconism A branch of light pulse of optical fiber carries out phase-modulation, after end of transmission, make first along after the first long-armed optical fiber along the second galianconism optical fiber Light pulse with first along being interfered along the light pulse of the second long-armed optical fiber after the first galianconism optical fiber；
The second controller receive again after the interference for collecting of the second light intensity detection device output in multiple Multiple light intensity of the light pulse under phase modulation voltage, and go out joint light according to the multiple phase modulation voltage, the multiple Light Intensity Scanning Pulse interference curve, a phase modulation electricity associated with one of them second odd-job point is found out from joint light pulse interference curve Press corresponding point, and by joint light pulse interference curve with the phase modulation voltage of the association of the point and with the point corresponding second The difference of the phase modulation voltage of odd-job point association draws phase drift parameter, according to the phase of phase drift parameter adjustment second Second odd-job point of position modulator obtains the second operating point, completes phase compensation procedure.
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CN108462576B (en) * 2018-03-23 2020-12-04 华南师范大学 Local active phase compensation method and system
CN108494494A (en) * 2018-03-28 2018-09-04 忻州师范学院 The method of real-time lock single photon phase
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