CN106789030B - 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
CN106789030B
CN106789030B CN201710026168.3A CN201710026168A CN106789030B CN 106789030 B CN106789030 B CN 106789030B CN 201710026168 A CN201710026168 A CN 201710026168A CN 106789030 B CN106789030 B CN 106789030B
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phase
optical fiber
light
light pulse
pulse
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CN106789030A (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

Abstract

The present invention provides a kind of local Active phase compensation system and methods, are related to field of quantum secure communication.A kind of local Active phase compensation system and method provided by the invention, since 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, make EVE that can not obtain phase information, improves security of system；Furthermore the local compensation of signal sending end and signal receiving end and hybrid compensation process scanning are intense light pulse interference curves, shorten sweep time, improve information duty ratio.

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 technique
Quantum key distribution is based on fundamental principles of quantum mechanics, is proved to theoretically be able to achieve unconditional secure communication, 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 distribution.Wherein, discrete variable quantum key distribution system has phase volume closest to practical application, most common coding mode Code and polarization encoder, for phase code quantum key distribution system, can phase drift be to influence its actual performance and One of an important factor for being run steadily in the long term under actual environment.
The Active phase compensation scheme of four phasescans of phase code quantum key distribution system in the prior art: Bob fixes load-modulate voltage, scans the Single-photon interference curve of the end Alice phase-modulator, is obtained according to interference curve The half-wave voltage of AliceAndThen four phase operating points successively fix each operating point of Alice, Bob is in certain voltage model Interior gradually on-load voltage is enclosed, scans the count curve of a Single-photon interference respectively, and calculate and compile according to the result of interference curve Code matrix, phase compensation finishes if encoder matrix meets ideal coding matrix, and otherwise, Alice adjusts operating point, and Bob is again Scan Single-photon interference curve.In phase compensation procedure, the every adjustment for carrying out one action point of Alice just needs Bob to scan 4 The count curve of Single-photon interference increases time and the complexity of Active phase compensation process.Meanwhile four phase method phase mend The process of repaying needs both sides to carry out information exchange, however, Active phase compensation attack (APC) can obtain each according to interactive information The definite phase information that photon is loaded,ThisNew back door may be opened to EVE.
Summary of the invention
In view of this, the embodiment of the present invention is designed to provide a kind of local Active phase compensation system and method, with Improve the above problem.
In a first aspect, the present 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 successively light connects are stated, the second controller is filled with second light intensity detection respectively It sets, second laser modulation treatment device electrical connection,
When first photoswitch is in an off state, laser light incident that the first laser light source issues is into described the One Laser Modulation processing unit；
First controller is executed Laser Modulation for controlling the first laser modulation treatment device into light pulse, And the pulsewidth of light pulse is greater than light pulse and passes through the time caused when the first long-armed optical fiber and the first galianconism optical fiber of interference ring Then light pulse is divided into two bundles and transmits respectively along the first long-armed optical fiber and the first galianconism optical fiber by difference, and in transmission process The middle multiple phase modulation voltages of load carry out phase-modulation to a branch of light pulse transmitted along the first galianconism optical fiber, the light after phase-modulation The operation that pulse and unmodulated light pulse are interfered；
First controller is also used to receive the light after the collected interference 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 issues is into the second laser modulation treatment device；
The second controller is executed Laser Modulation for controlling the second laser modulation treatment device into light pulse, And the pulsewidth of light pulse is greater than light pulse and passes through the time caused when the second long-armed optical fiber and the second galianconism optical fiber of interference ring Then light pulse is divided into two bundles and transmits respectively along the second long-armed optical fiber and the second galianconism optical fiber by difference, and in transmission process In loaded in transmission process multiple phase modulation voltages the transmission along the second galianconism optical fiber a branch of light pulse carry out phase-modulation, After end of transmission, operation that light pulse after phase-modulation and unmodulated light pulse are interfered；
The second controller is also used to receive the light after the collected interference 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；
First photoswitch in the closure state, first controller is also used to described in secondary control again first and swashs Light modulation processing unit is executed Laser Modulation into light pulse, and the pulsewidth of light pulse is less than first that interference ring is passed through in light pulse Then light pulse is divided into two bundles respectively along the first long-armed optical fiber by caused time difference when long-armed optical fiber and the first galianconism optical fiber It is transmitted with the first galianconism optical fiber, it is fixed in transmission process to load the corresponding phase modulation voltage pair in one of them first operating point A branch of light pulse along the transmission of the first galianconism optical fiber carries out phase-modulation；
After the first long-armed optical fiber and the first galianconism optical fiber end of transmission, 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 two-beam pulse being divided into four bundles light pulse along the second long-armed optical fiber It is transmitted with the second galianconism optical fiber, and loads multiple phase modulation voltages in transmission process and elder generation is transmitted along long-armed optical fiber, rear edge A branch of light pulse of second galianconism optical fiber carries out phase-modulation, after end of transmission, makes first after the first long-armed optical fiber transmission along the The light pulse of two galianconism optical fiber transmission is interfered with the light pulse first after the first galianconism optical fiber along the second long-armed optical fiber；
After the second controller is also used to receive the collected interference of the second light intensity detection device output 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, one is found out from joint light pulse interference curve and is closed with one of them second odd-job point The corresponding point of the phase modulation voltage of connection, and by joint light pulse interference curve with the associated phase modulation voltage of the point and with the point The difference of the corresponding associated phase modulation voltage of second odd-job point obtains phase drift parameter, according to the phase drift parameter Second odd-job point of adjustment second phase modulator obtains the second operating point, completes phase compensation procedure.
Second aspect, the embodiment of the invention also provides a kind of local Active phase compensation methodes, are 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 successively light connects, the second controller is respectively with described Two light intensity detection devices, second laser modulation treatment device electrical connection,
When first photoswitch is in an off state, laser light incident that the first laser light source issues is into described the One Laser Modulation processing unit,
First controller controls the first laser modulation treatment device and executes Laser Modulation into light pulse, and light The pulsewidth of pulse is greater than pulse and passes through the time difference caused when the first long-armed optical fiber and the first galianconism optical fiber of fiber interferometer, Then light pulse is divided into two bundles and is transmitted respectively along the first long-armed optical fiber and the first galianconism optical fiber, and added in transmission process It carries multiple phase modulation voltages and phase-modulation is carried out to a branch of light pulse transmitted along the first galianconism optical fiber, and make the light after phase-modulation Pulse is interfered with unmodulated light pulse；
First controller receives the light pulse after the collected interference 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 issues is into the second laser modulation treatment device；
The second controller controls the second laser modulation treatment device and executes Laser Modulation into light pulse, and light The pulsewidth of pulse is greater than pulse and passes through the time difference caused when the second long-armed optical fiber and the second galianconism optical fiber of interference ring, then Light pulse is divided into two bundles and is transmitted respectively along the second long-armed optical fiber and the second galianconism optical fiber, and is being transmitted in transmission process A branch of light pulse that multiple phase modulation voltages are loaded in the process in the transmission along the second galianconism optical fiber carries out phase-modulation, is transferring Bi Hou interferes the light pulse after phase-modulation with unmodulated 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 light pulse after the collected interference 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；
First photoswitch in the closure state, first controller modulation of first laser described in secondary control again Processing unit is executed Laser Modulation into light pulse, and the pulsewidth of light pulse is less than the first long-armed optical fiber that interference ring is passed through in pulse With the time difference caused when the first galianconism optical fiber, then light pulse is divided into two bundles short along the first long-armed optical fiber and first respectively Arm optical fiber is transmitted；And it is fixed in transmission process and loads the corresponding phase modulation voltage in one of them first operating point 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 end of transmission, 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 are loaded multiple phase modulation voltages in transmission process and transmitted to elder generation along long-armed optical fiber, after along second A branch of light pulse of galianconism optical fiber carries out phase-modulation, after end of transmission, makes first after the first long-armed optical fiber along the second galianconism light Fine light pulse is interfered with the light pulse first after the first galianconism optical fiber along the second long-armed optical fiber；
The second controller receives being in after the collected interference of the second light intensity detection device output again Multiple light intensity of light pulse under multiple phase modulation voltages, and go out to join according to the multiple phase modulation voltage, the multiple Light Intensity Scanning Light combination pulse interference curve finds out one and one of them second associated tune of odd-job point from joint light pulse interference curve The corresponding point of phase voltage, and by joint light pulse interference curve with the associated phase modulation voltage of the point and corresponding to this point The difference of the second associated phase modulation voltage of odd-job point obtains phase drift parameter, according to 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, a kind of local Active phase compensation system and method provided by the invention, since signal is sent out 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 At improving security of system so that EVE can not obtain phase information so as to avoid in classical transmission scanning result； Furthermore the local compensation of signal sending end and signal receiving end and hybrid compensation process scanning are intense light pulse interference curves, contracting Short sweep time, improve information duty ratio.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.The present invention being usually described and illustrated herein in the accompanying drawings is implemented The component of example can be arranged and be designed with a variety of different configurations.Therefore, below to the reality of the invention provided in the accompanying drawings The detailed description for applying example is not intended to limit the range of claimed invention, but is merely representative of selected implementation of the invention Example.Based on the embodiments of the present invention, obtained by those of ordinary skill in the art without making creative efforts Every other embodiment, shall fall within the protection scope of the present invention.
Fig. 1 is the structural block diagram of the first local Active phase compensation system provided in an embodiment of the present invention；
Fig. 2 is the structural block diagram of second provided in an embodiment of the present invention local Active phase compensation system；
Fig. 3~Fig. 6 is the flow chart of second provided in an embodiment of the present invention local Active phase compensation system.
Icon: 101- first laser light source；102- first laser modulation treatment device；103- the first light intensity detection device； The first controller of 104-；The first photoswitch of 105-；106- optical attenuator；107- the first galianconism optical fiber；The long-armed optical fiber of 108- first； 109- Long haul fibers；The first intensity modulator of 110-；111- first phase modulator；The first beam splitter of 112-；113- first Photo-coupler；The first faraday mirror of 114-；The second faraday mirror of 115-；The first single-photon detector of 116-；The second monochromatic light of 117- Sub- detector；The smooth beam-splitting coupler of 118- first；201- second laser light source；202- second laser modulation treatment device；203- Second light intensity detection device；204- second controller；The second photoswitch of 205-；206- the second galianconism optical fiber；207- second is long-armed Optical fiber；The second intensity modulator of 208-；209- second phase modulator；The second beam splitter of 210-；The second photo-coupler of 211-； 212- third faraday mirror；The 4th faraday mirror of 213-；214- third photoswitch；215- circulator；The smooth beam splitting coupling of 216- second Clutch.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
Please 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 202, the second light intensity detection device 203 and second controller 204.First controller 104 respectively with the first light intensity detection device 103, first laser modulation treatment device 102 is electrically connected, first laser modulation treatment device 102, the first photoswitch and light decay Subtract the successively light connects 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 202, the second light intensity detection device 203 and second controller 204 constitute signal receiving end.Information transmitting terminal obtains four work The mode of point are as follows:
When the first photoswitch 105 is in an off state, the laser light incident that first laser light source issues is into first laser tune Processing unit 102 processed.
First controller 104 is executed Laser Modulation for controlling first laser modulation treatment device 102 into light pulse, and The pulsewidth of light pulse is greater than caused when pulse passes through the first long-armed optical fiber 108 of fiber interferometer with the first galianconism optical fiber 107 Time difference, then light pulse is divided into two bundles and is transmitted respectively along the first long-armed optical fiber 108 with the first galianconism optical fiber 107, And in transmission process to the first phase modulator load multiple phase modulation voltages make along the first galianconism optical fiber transmit light arteries and veins The phase of punching is modulated, the operation that the light pulse after making phase-modulation and unmodulated light pulse are interfered.
Specifically, the structure of first laser modulation treatment device 102 and the control first laser modulation of the first controller 104 It includes but is not limited to following two that processing unit 102, which executes 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 issues laser light incident into the first intensity modulator 110；
First controller 104 is for controlling the first intensity modulator 110 for Laser Modulation into light pulse, and the arteries and veins of light pulse When being wider than pulse and passing through caused when the first long-armed optical fiber 108 and the first galianconism optical fiber 107 of Mach Zehnder interference ring Between it is poor；
Through the modulated optical pulse strikes of the first intensity modulator 110 into the first beam splitter 112, through the first beam splitter Light pulse is divided into two beams and is transmitted respectively along the first long-armed optical fiber 108 with the first galianconism optical fiber 107 after 112, and is transmitting The first controller 104 loads multiple phase modulation voltages to along the first galianconism optical fiber for controlling first phase modulator 111 in the process 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 It relates 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 Spend modulator 110, first phase modulator 111, the first smooth beam-splitting coupler 118, the first faraday mirror 114, the second faraday Mirror 115, controller are electrically connected with the first intensity modulator 110, first phase modulator 111 respectively,
First laser light source issues laser light incident into the first intensity modulator 110, and the first controller 104 is for controlling first Intensity modulator 110 is by Laser Modulation at light pulse, and the pulsewidth of light pulse is greater than first that faraday's interference ring is passed through in pulse Caused time difference when long-armed optical fiber 108 and the first galianconism optical fiber 107；
Through the modulated optical pulse strikes of the first intensity modulator 110 into the first smooth beam-splitting coupler 118, through the first light point Light pulse is divided into two beams and is transmitted respectively along the first long-armed optical fiber 108 with the first galianconism optical fiber 107 after bundle coupler 118, And the first controller 104 loads multiple phase modulation voltages to along first for controlling first phase modulator 111 in transmission process 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 It draws mirror 114, the second faraday mirror 115 to be reflected back the first smooth beam-splitting coupler 118 to interfere.
First controller 104 is also used to receive multiple light intensity of the first light intensity detection device 103 output, and according to multiple tune 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,minCorresponding phase modulation voltage value Va,0、Va,π AndWherein Va,half=| Va,π-Va,0|。
Specifically, the mode for obtaining four the first operating points can choose the first light pulse interference for the first controller 104 It is one between two adjacent light intensity value extreme points (being wherein a maximum point, another is minimum point) on curve Period.When light intensity is in maximum point pa,maxWhen, the phase difference for two light pulses interfered at this time is 0, and also referred to as 0 phase point is corresponding Phase modulation voltage be denoted as Va,0；When light intensity is in minimum point pa,minWhen, the phase difference for two light pulses interfered at this time is π, also referred to as For π phase point, corresponding phase modulation voltage is denoted as Va,π；The half-wave voltage of first phase modulator 111 is obtained according to 0 phase point and π phase point Va,half=| Va,π-Va,0|；When light intensity value takesWhen, the phase difference for two light pulses interfered at this time isAlso referred to as ForPhase point, corresponding phase modulation voltage are denoted asThus it obtainsThe corresponding phase modulation voltage of phase point is
Information receiving end obtains the mode of four the second odd-job points are as follows:
The laser light incident that second laser light source issues is into second laser modulation treatment device 202.
Second controller 204 is executed Laser Modulation for controlling second laser modulation treatment device 202 into light pulse, and The pulsewidth of light pulse is greater than pulse and passes through the time caused when the second long-armed optical fiber and the second galianconism optical fiber 206 of interference ring Then light pulse is divided into two bundles and transmits respectively along the second long-armed optical fiber and the second galianconism optical fiber 206, and is being transmitted across by difference Multiple phase modulation voltages are loaded in journey, and phase-modulation is carried out to the light pulse transmitted along the second galianconism optical fiber 206, after end of transmission, The operation that light pulse and unmodulated light pulse after making phase-modulation are interfered.
Specifically, the structure of second laser modulation treatment device 202 and second controller 204 control second laser modulation It includes but is not limited to following two that processing unit 202, which executes 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 issues laser light incident into the second intensity modulator 208,
Second controller 204 is for controlling the second intensity modulator 208 for Laser Modulation into light pulse, and the arteries and veins of light pulse When being wider than pulse and passing through caused when the second long-armed optical fiber 207 and the second galianconism optical fiber 206 of Mach Zehnder interference ring Between it is poor；
Through the modulated optical pulse strikes of the second intensity modulator 208 into the second beam splitter 210, through the second beam splitter Light pulse is divided into two beams and is transmitted respectively along the second long-armed optical fiber 207 with the second galianconism optical fiber 206 after 210, and is transmitting Second controller 204 loads multiple phase modulation voltages to along the second galianconism optical fiber for controlling second phase modulator 209 in the process 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 hair 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 Spend 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 in an off state, and the second photoswitch 205 is in and switches to and the second intensity modulator 208 It connects and third photoswitch 214 switches to when connecting with the second light intensity detection device 203,
Second laser light source issues laser light incident into the second intensity modulator 208,
Second controller 204 is for controlling the second intensity modulator 208 for Laser Modulation into light pulse, and the arteries and veins of light pulse It is wider than pulse and passes through the time difference caused when the second long-armed optical fiber 207 and the second galianconism optical fiber 206 of faraday's interference ring；
Through the modulated optical pulse strikes of the second intensity modulator 208 into the second smooth beam-splitting coupler 216, through the second light point Light pulse is divided into two beams and is transmitted respectively along the second long-armed optical fiber and 207 second galianconism optical fiber 206 after bundle coupler 216, And second controller 204 loads multiple phase modulation voltages to along second for controlling second phase modulator 209 in transmission process The light pulse that galianconism optical fiber 206 transmits carries out phase-modulation, and two-beam pulse is respectively through third faraday mirror after end of transmission 212, the 4th faraday mirror 213 is reflected back the second smooth beam-splitting coupler 216 and interferes.
It is multiple under multiple phase modulation voltages that second controller 204 is used to receive the output of the second light intensity detection device 203 Light intensity, and go out the second light pulse interference curve according to multiple phase modulation voltages, multiple Light Intensity Scannings, and interfere according to the second light pulse Four the second odd-job points of curve acquisition second phase modulator.
Wherein, four the second odd-job points are respectively that the power in a cycle of the second light pulse interference curve is very big It is worth point Pb,max, power half value pointPower minimum point Pb,minCorresponding phase modulation voltage value Vb,0、 Vb,πAndWherein Vb,half=| Vb,π-Vb,0|。
The mode that the corresponding phase modulation voltage of four the second odd-job points obtains is identical as the mode of four the first operating points, It is just no longer herein to repeat more.
Second laser light source 201, the first photoswitch 105 be in closed state, the second photoswitch 205 is switched to closing and The connection of Long haul fibers 109, third photoswitch 214 switch to when connecting with the second light intensity detection device, and the first controller 104 is also used It executes Laser Modulation in control first laser modulation treatment device 102 again into light pulse, and the pulsewidth of light pulse is less than light Time difference caused by the first long-armed optical fiber 108 and the first galianconism optical fiber 107 of the pulse by interference ring, then by light pulse point It is transmitted respectively along the first long-armed optical fiber 108 with the first galianconism optical fiber 107 for two beams；To first phase in transmission process A phase modulation voltage in first operating point of the fixed load of modulator 111 of position makes the light pulse transmitted along 107 optical fiber of the first galianconism Phase is modulated.
Specifically, the mode that the first controller 104 executes aforesaid operations also includes two kinds, please specifically be respectively referred to above-mentioned First controller 104 control first laser modulation treatment device 102 executes above-mentioned operation, just no longer herein to repeat more.
After the first long-armed optical fiber 108 and 107 end of transmission of the first galianconism optical fiber, two-beam pulse is respectively through a long-range light Fibre 109 is by being incident to second laser modulation treatment device 202 after optical attenuator 106；Second laser modulation treatment device 202 is used It transmits, and is passing 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 Load multiple phase modulation voltages during defeated and elder generation transmitted 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, light that elder generation is transmitted after the first long-armed optical fiber 108 along the second galianconism optical fiber 206 Pulse is interfered with the light pulse first after the first galianconism optical fiber 107 along the second long-armed optical fiber 207.
Second controller 204 be also used 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 one of them second associated phase modulation voltage of odd-job point, and passes through joint light arteries and veins Rush on interference curve with the associated phase modulation voltage of the point and the associated phase modulation voltage of the second odd-job point corresponding to this point Difference obtain phase drift parameter, according to the phase drift parameter adjustment second phase modulator 209 the second casual labour Make point and obtain the second operating point, completes 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 in the single-photon detector of linear operation mode.
After phase compensation, carry out key distribution mode can for when fiber interferometer is faraday's interference ring, The process of key distribution is as follows:
First, it is assumed that:
The phase modulation voltage value V of transmitting terminala,0,Represent logical bits 0, Va,π,Represent logical bits 1；
Receiving end fromMiddle random selection phase modulation voltage-drop loading phase；
3. the phase difference for two pulses met at the second smooth beam-splitting coupler is 0, if wherein the first single photon detection Device 116 respond, then receiving end 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 responds, receiving end is counter push away transmitting terminal sends is bit 1.
The first step, the first photoswitch 105 switch to 106 place optical path of optical attenuator, and the second photoswitch 205 switches to long-range Optical path where optical fiber 109, third photoswitch 214 switch to the optical path where the first single-photon detector, make the first single photon Detector 116, the work of the second single-photon detector 117 close the second laser light source 201 of receiving end in Geiger mode angular position digitizer.
Second step, transmitting terminal re-modulate light impulse length in the manner described above, and the first controller 104 controls pulsewidth, and When the pulsewidth of light pulse is greater than caused by the first long-armed optical fiber 108 and the first galianconism optical fiber 107 of the light pulse by interference ring Between it is poor.Then optical pulse strikes are divided into two pulses into the first smooth beam-splitting coupler 118, walk the first long-armed optical fiber 108 respectively With the first galianconism optical fiber 107, then two-beam pulse is reflected 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, thus two light pulses Four pulses are divided into, walk the second long-armed optical fiber 207 and the second galianconism optical fiber 206 of faraday's interference ring respectively, finally quilt Third faraday mirror 212 and the 4th faraday mirror 213 are reflected back the second smooth beam-splitting coupler216.Second control of receiving end Device 204 randomly chooses the second operating pointIn an arbitrary phase modulation voltage, to one in front and one in back twice pass through second A phase is modulated in two light pulses of phase-modulator 209AndIt is 0, orProbability be impartial.Four Get ahead in pulse the first long-armed optical fiber 108, after walk the pulse of the second galianconism optical fiber 206 and the first galianconism optical fiber 107 that gets ahead, after walk The phase difference of the pulse of second long-armed optical fiber 207And two pulse at the second smooth beam-splitting coupler 216 do It relates to, the pulse signal after interference can be such that the first single-photon detector 116 or the second single-photon detector 117 responds.
Step 3: obtaining primary key.
WhenWhen, if the first single-photon detector 116 respond, according to assumed condition it is counter push away transmitting terminal send It is bit 0；WhenWhen, if the second single-photon detector 117 respond, according to assumed condition it is counter push away transmitting terminal send It is bit 1.Receiving end combines the response condition of the first single-photon detector 116 or the second single-photon detector as a result, obtains original Beginning key.
Step 4: to base.
The phase information that second phase modulator 209 is modulated is sent to transmitting terminal by classical channel by receiving end, is sent out Sending end will meetWithThe serial number of bit be sent to receiving end, both sides only retain the corresponding Bit String of serial number, To obtain screening code.
Step 5: error code is estimated.
N number of bit in receiving end 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 end, obtains estimating bit error rateWhen bit error rate p >=11%, communication failure is re-started Key distribution carries out quantum key distribution post-processing when bit error rate p < 11%.
Step 6: quantum key distribution post-processes
Transmitting terminal and receiving end use error correction algorithm, carry out information exchange by classical channel, receiving end is screened in code Error correcting；Key after negotiating in order to ensure transmitting terminal and receiving end is completely the same, and both sides can pass through classical channel ratio To cryptographic Hash.If cryptographic Hash is identical, then it is assumed that key agreement；Otherwise, it re-starts key distribution or continues key agreement； According to bit error rate estimation, distribution of light sources estimation, security of system demand and cipher key agreement process the factors such as information interaction amount into Row comprehensive assessment obtains the compressibility factor of secrecy amplification, compresses to the bit after key agreement, and final acquisition safety is close Key.
Fig. 3, Fig. 4, Fig. 5, Fig. 6 are please referred to, the embodiment of the invention also provides a kind of local Active phase compensation methodes, answer For local Active phase compensation system.It should be noted that Active phase compensation method in local provided by the present embodiment, Basic principle and the technical effect of generation are identical with above-described embodiment, and to briefly describe, the present embodiment part does not refer to place, 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, 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 controller 104 divides It is not electrically connected with the first light intensity detection device 103, first laser modulation treatment device 102, first laser modulation treatment device 102, successively light connects, second controller 204 are filled with the second light intensity detection respectively for the first photoswitch 105 and optical attenuator 106 Set the electrical connection of 203, second laser modulation treatment device 202.As shown in figure 3, the light pulse phase compensation step includes:
Step S401: when the first photoswitch 105 is in an off state, laser light incident that first laser light source issues is into the One Laser Modulation processing unit 102.
The S402: the first controller of step 104 controls first laser modulation treatment device 102 for Laser Modulation into light pulse, Then light pulse is divided into two bundles, is transmitted respectively along the first long-armed optical fiber 108 with the first galianconism optical fiber 107.
When the pulsewidth of light pulse is greater than first long-armed optical fiber 108 and first galianconism optical fiber 107 of the light pulse by interference ring The caused time difference.
Step S403: first laser modulation treatment device 102 loads multiple phase modulation voltages and transmits to along the first galianconism optical fiber A branch of light pulse carry out phase-modulation, and the light pulse after phase-modulation is interfered with unmodulated light pulse.
Reception the first light intensity detection device 103 output of the S404: the first controller of step 104 is under multiple phase modulation voltages Multiple light intensity.
The S405: the first controller of step 104 goes out the first light pulse interference song according to multiple phase modulation voltages, multiple Light Intensity Scannings Line, and according to four the first operating points of the first light pulse interference curve acquisition first phase modulator.
As shown in figure 4, the light pulse phase compensation step further include:
Step S406: the laser light incident that second laser light source 201 issues is into second laser modulation treatment device 202.
Step S407: second controller 204 controls second laser modulation treatment device 202 for Laser Modulation into light pulse, Then light pulse is divided into two bundles, is transmitted respectively along the second long-armed optical fiber 207 with the second galianconism optical fiber 206.
The pulsewidth of light pulse is greater than 206 institute of the second long-armed optical fiber 207 and the second galianconism optical fiber that interference ring is passed through in light pulse The caused time difference.
Step S408: second laser modulation treatment device 202 loads second phase modulator 209 more in transmission process A phase modulation voltage modulates the phase for the light pulse transmitted along the second galianconism optical fiber 206, after end of transmission, by phase tune Light pulse after system is interfered with unmodulated light pulse.
Step S409: multiple tune are in after the interference of reception the second light intensity detection device 203 output 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 according to four the second odd-job points of the second light pulse interference curve acquisition second phase modulator.
As shown in figure 5, the light pulse phase compensation step further include:
Step S411: the first photoswitch 105 in the closure state, the first controller 104 controls first laser again Laser Modulation is divided into two bundles respectively at light pulse, and by light pulse along the first long-armed optical fiber 108 and by modulation treatment device 102 One galianconism optical fiber 107 is transmitted.
The pulsewidth of light pulse is less than 107 institute of the first long-armed optical fiber 108 and the first galianconism optical fiber that interference ring is passed through in light pulse The caused time difference.
Step S412: first laser modulation treatment device 102 is fixed to first phase modulator 111 in transmission process adds Carrying in the first operating point a phase modulation voltage modulates the light pulse phase transmitted along the first galianconism optical fiber 107.
Step S413: after the first long-armed optical fiber 108 and 107 end of transmission of the first galianconism optical fiber, two-beam pulse difference Second laser modulation treatment device 202 is incident to after a Long haul fibers 109 are by 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 second phase modulator 209 more in transmission process A phase modulation voltage modulates the phase for the light pulse transmitted along the second galianconism optical fiber 207.
As shown in fig. 6, the light pulse phase compensation step further include:
Step S416: after end of transmission, by elder generation along the light pulse of the second galianconism optical fiber 206 after the first long-armed optical fiber 108 Interfered with light pulse of the elder generation after the first galianconism optical fiber 107 along the second long-armed optical fiber.
Step S417: second controller 204 receives the electric in multiple phase modulation of the second light intensity detection device 203 output 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: second controller 204 is found out in 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 passes through the voltage value of the point on joint light pulse interference curve and is corresponding to it The difference of phase modulation voltage value of the second odd-job point obtain phase drift parameter, according to phase drift parameter adjustment the Second odd-job point of two phase modulator 209 obtains the second operating point, completes phase compensation procedure.
In conclusion a kind of local Active phase compensation system provided by the invention 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, thus It avoids and improves security of system so that EVE can not obtain phase information in classical transmission scanning result；Furthermore believe 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 duty ratio is improved.
In several embodiments provided herein, it should be understood that disclosed device and system can also pass through Other modes are realized.The apparatus embodiments described above are merely exemplary, for example, flow chart and block diagram in attached drawing Show the device of multiple embodiments according to the present invention, the architectural framework in the cards of system and computer program product, Function and operation.In this regard, each box in flowchart or block diagram can represent the one of a module, section or code Part, a part of the module, section or code include the executable finger of logic function as defined in one or more realize It enables.It should also be noted that function marked in the box can also be to be different from attached drawing in some implementations as replacement Middle marked sequence occurs.For example, two continuous boxes can actually be basically executed in parallel, they sometimes can also be with It executes in the opposite order, this depends on the function involved.It is also noted that each side in block diagram and or flow chart The combination of box in frame and block diagram and or flow chart can be based on firmly with the defined function of execution or the dedicated of movement The system of part is realized, or can be realized using a combination of dedicated hardware and computer instructions.
In addition, each functional module in each embodiment of the present invention can integrate one independent portion of formation together Point, it is also possible to modules individualism, an independent part can also be integrated to form with two or more modules.
It, can be with if the function is realized and when sold or used as an independent product in the form of software function module It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a People's computer, server or network equipment etc.) execute all or part of the steps of system described in each embodiment of the present invention. And storage medium above-mentioned includes: that USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.It needs Illustrate, herein, relational terms such as first and second and the like be used merely to by an entity or operation with Another entity or operation distinguish, and without necessarily requiring or implying between these entities or operation, there are any this realities The relationship or sequence on border.Moreover, the terms "include", "comprise" or its any other variant are intended to the packet of nonexcludability Contain, so that the process, system, article or the equipment that include a series of elements not only include those elements, but also including Other elements that are not explicitly listed, or further include for this process, system, article or the intrinsic element of equipment. In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that including the element Process, system, there is also other identical elements in article or equipment.
The foregoing is only a preferred embodiment of the present invention, is not intended to limit the present invention, for those skilled in the art For member, the invention may be variously modified and varied.All within the spirits and principles of the present invention, it is made it is any modification, Equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.It should also be noted that similar label and letter are under Similar terms are indicated in the attached drawing in face, therefore, once being defined in a certain Xiang Yi attached drawing, are not then needed in subsequent attached drawing It is further defined and explained.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to Non-exclusive inclusion, so that process, system, article or equipment including a series of elements are not only wanted including those Element, but also including other elements that are not explicitly listed, or further include for this process, system, article or equipment Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that There is also other identical elements in process, system, article or equipment including the element.

Claims (8)

1. a kind of local Active phase compensation system, which is characterized in that the local Active phase compensation system includes first sharp 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, the first laser tune Processing unit, first photoswitch and the optical attenuator processed successively light connects, the second controller respectively with it is described Second light intensity detection device, second laser modulation treatment device electrical connection,
When first photoswitch is in an off state, the laser light incident that the first laser light source issues swashs into described first Light modulation processing unit；
First controller is executed Laser Modulation for controlling the first laser modulation treatment device into light pulse, and light The pulsewidth of pulse is greater than light pulse and passes through the time caused when the first long-armed optical fiber and the first galianconism optical fiber of fiber interferometer Then light pulse is divided into two bundles and transmits respectively along the first long-armed optical fiber and the first galianconism optical fiber by difference, and in transmission process The middle multiple phase modulation voltages of load carry out phase-modulation to a branch of light pulse transmitted along the first galianconism optical fiber, the light after phase-modulation The operation that pulse and unmodulated light pulse are interfered；
First controller is also used to receive the light pulse after the collected interference 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 Four the first operating points of the first light pulse interference curve acquisition first phase modulator；
The laser light incident that the second laser light source issues is into the second laser modulation treatment device；
The second controller is executed Laser Modulation for controlling the second laser modulation treatment device into light pulse, and light The pulsewidth of pulse is greater than light pulse and passes through the time difference caused when the second long-armed optical fiber and the second galianconism optical fiber of interference ring, so Light pulse is divided into two bundles afterwards and is transmitted respectively along the second long-armed optical fiber and the second galianconism optical fiber, and is loaded in transmission process Multiple phase modulation voltages carry out phase-modulation, after end of transmission, phase to a branch of light pulse of the transmission along the second galianconism optical fiber The operation that modulated light pulse and unmodulated light pulse are interfered；
The second controller is also used to receive the light pulse after the collected interference 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 Four the second odd-job points of the second light pulse interference curve acquisition second phase modulator；
First photoswitch in the closure state, first controller is also used to first laser tune described in secondary control again Processing unit processed is executed Laser Modulation into light pulse, and the pulsewidth of light pulse is less than light pulse by the first long-armed of interference ring Then light pulse is divided into two bundles respectively along the first long-armed optical fiber and by caused time difference when optical fiber and the first galianconism optical fiber 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 transmission process 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 end of transmission, 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 being divided into four bundles light pulse along the second long-armed optical fiber and the Two galianconism optical fiber are transmitted, and are loaded multiple phase modulation voltages in transmission process and transmitted to elder generation along long-armed optical fiber, after along second A branch of light pulse of galianconism optical fiber carries out phase-modulation, after end of transmission, makes first short along second after the first long-armed optical fiber transmission The light pulse of arm optical fiber transmission is interfered with the light pulse first after the first galianconism optical fiber along the second long-armed optical fiber；
The second controller is also used to receive the place after the collected interference of the second light intensity detection device output again Multiple light intensity of 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, from joint light pulse interference curve find out one it is associated with one of them second odd-job point The corresponding point of phase modulation voltage, and by corresponding with the associated phase modulation voltage of the point and with the point on joint light pulse interference curve The difference of the second associated phase modulation voltage of odd-job point obtain phase drift parameter, adjusted according to the phase drift parameter Second odd-job point of second phase modulator obtains the second operating point, completes phase compensation procedure；
Four first operating points are respectively that the first light pulse interference curve is in 0 phase, pi/2 phase, π phase and 3 pi/2s Corresponding four the first phase modulation voltage values when phase, wherein 0 phase is very big for light intensity value in one cycle The corresponding phase of the first phase modulation voltage value when value, the π phase is light intensity value in one cycle when being minimum the The corresponding phase of one phase modulation voltage value, the pi/2 phase, 3 pi/2 phases are light intensity value in one cycle in maximum Phase corresponding with the first phase modulation voltage value when the half value point among minimum；
Four second odd-job points be respectively the second light pulse interference curve be in 0 phase, pi/2 phase, π phase and Corresponding four the second phase modulation voltage values when 3 pi/2 phase, wherein 0 phase is that light intensity value in one cycle is The corresponding phase of the second phase modulation voltage value when maximum, the π phase is light intensity value in one cycle when being minimum The corresponding phase of the second phase modulation voltage value, the pi/2 phase, 3 pi/2 phases are that light intensity value in one cycle is in pole It is big to be worth phase corresponding with the second phase modulation voltage value when the half value point among minimum.
2. local Active phase compensation system according to claim 1, which is characterized in that the fiber interferometer is horse Conspicuous-Zeng Deer interference ring, the first laser modulation treatment device include 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 issues laser light incident into first intensity modulator,
First controller is for controlling first intensity modulator for Laser Modulation into light pulse, and the pulsewidth of light pulse Caused time difference when passing through the first long-armed optical fiber and the first galianconism optical fiber of Mach Zehnder interference ring greater than pulse；
Through the modulated optical pulse strikes of the first intensity modulator into first beam splitter, through the described first smooth beam splitting Light pulse is divided into two beams and is transmitted respectively along the first long-armed optical fiber and the first galianconism optical fiber after device, and right in transmission process The first phase modulator, which loads multiple phase modulation voltages, modulates the phase for the light pulse transmitted along the first galianconism optical fiber, 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, which is characterized in that the fiber interferometer is horse Conspicuous-Zeng Deer interference ring, the second laser modulation treatment device include the second intensity modulator, second phase modulator, the Two beam splitters and the second photo-coupler, the second controller respectively with second intensity modulator, second phase tune Device electrical connection processed,
The second laser light source issues laser light incident into second intensity modulator,
The second controller is for controlling second intensity modulator for Laser Modulation into light pulse, and the pulsewidth of light pulse Caused time difference when passing through the second long-armed optical fiber and the second galianconism optical fiber of Mach Zehnder interference ring greater than pulse；
Through the modulated optical pulse strikes of the second intensity modulator into second beam splitter, through the described second smooth beam splitting Light pulse is divided into two beams and is transmitted respectively along the second long-armed optical fiber and the second galianconism optical fiber after device, and right in transmission process The second phase modulator load phase modulation voltage modulates the light pulse phase transmitted along the second galianconism optical fiber, is transmitting After, two-beam pulse enters to inject the second photo-coupler and interferes.
4. local Active phase compensation system according to claim 3, which is characterized in that the second controller is for controlling Second intensity modulator is made by Laser Modulation into light pulse, and the pulsewidth of light pulse is less than pulse and passes through Mach-Zehnder Caused time difference when the long-armed optical fiber of the second of interference ring and the second galianconism optical fiber；
After the first long-armed optical fiber and the first galianconism optical fiber end of transmission, 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 makes first the multiple phase modulation voltages of second phase modulator load along first in transmission process Phase after long-armed optical fiber along the light pulse of the second galianconism optical fiber transmission is modulated, and second light is incident to after end of transmission Coupler, at second photo-coupler first after the first long-armed optical fiber along the light pulse of the second galianconism optical fiber and first along first Light pulse after galianconism optical fiber along the second long-armed optical fiber is interfered.
5. local Active phase compensation system according to claim 1, which is characterized in that the fiber interferometer is farad Interference ring, the first laser modulation treatment device include 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 is to polarize unrelated phase-modulator, described Controller is electrically connected with first intensity modulator, first phase modulator respectively,
The first laser light source issues laser light incident into first intensity modulator,
First controller is for controlling first intensity modulator for Laser Modulation into light pulse, and the pulsewidth of light pulse Caused time difference when passing through the first long-armed optical fiber and the first galianconism optical fiber of faraday's interference ring greater than pulse；
Through the modulated optical pulse strikes of the first intensity modulator into the described first smooth beam-splitting coupler, through first light Light pulse is divided into two beams and is transmitted respectively along the first long-armed optical fiber and the first galianconism optical fiber after beam-splitting coupler, and is transmitting Loading multiple phase modulation voltages to the first phase modulator in the process makes the phase for the light pulse transmitted along the first galianconism optical fiber It is 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 interferes.
6. local Active phase compensation system according to claim 1, which is characterized in that the fiber interferometer is farad Interference ring, the second laser modulation treatment device include the second intensity modulator, second phase modulator, the second smooth beam splitting Coupler, third faraday mirror and the 4th faraday mirror, the second phase modulator are to polarize unrelated phase-modulator, institute Second controller is stated to be electrically connected with second intensity modulator, second phase modulator respectively,
The second laser light source issues laser light incident into second intensity modulator,
The second controller is for controlling second intensity modulator for Laser Modulation into light pulse, and the pulsewidth of light pulse Caused time difference when passing through the second long-armed optical fiber and the second galianconism optical fiber of faraday's interference ring greater than pulse；
Through the modulated optical pulse strikes of the second intensity modulator into the described second smooth beam-splitting coupler, through second light Light pulse is divided into two beams and is transmitted respectively along the second long-armed optical fiber and the second galianconism optical fiber after beam-splitting coupler, and is transmitting Adjust the light pulse phase transmitted along the second galianconism optical fiber second phase modulator load phase modulation voltage in the process System, after end of transmission, two-beam pulse is reflected back the second smooth beam splitting through third faraday mirror, the 4th faraday mirror respectively and couples Device interferes.
7. local Active phase compensation system according to claim 1, which is characterized 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.
8. a kind of local Active phase compensation method, which is characterized in that be applied to local Active phase compensation system, the local Active phase compensation system includes first laser light source, first laser modulation treatment device, the first light intensity detection device, the first control Device, the first photoswitch, optical attenuator and second laser light source processed, second laser modulation treatment device, the second light intensity detection dress It sets and second controller, first controller is respectively and at the first light intensity detection device, the first laser modulation Device electrical connection is managed, successively light connects for the first laser modulation treatment device, first photoswitch and the optical attenuator It connecing, the second controller is electrically connected with the second light intensity detection device, the second laser modulation treatment device respectively,
When first photoswitch is in an off state, the laser light incident that the first laser light source issues swashs into described first Light modulation processing unit,
First controller controls the first laser modulation treatment device and executes Laser Modulation into light pulse, and light pulse Pulsewidth be greater than when the first long-armed optical fiber and the first galianconism optical fiber of fiber interferometer are passed through in pulse caused time difference, then Light pulse is divided into two bundles and is transmitted respectively along the first long-armed optical fiber and the first galianconism optical fiber, is loaded in transmission process multiple Phase modulation voltage carries out phase-modulation to a branch of light pulse for transmitting along the first galianconism optical fiber, and make the light pulse after phase-modulation with Unmodulated light pulse is interfered；
First controller receives the multiple of the light pulse after the collected interference 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 issues is into the second laser modulation treatment device；
The second controller controls the second laser modulation treatment device and executes Laser Modulation into light pulse, and light pulse Pulsewidth be greater than when the second long-armed optical fiber and the second galianconism optical fiber of interference ring are passed through in pulse caused time difference, then by light Pulse is divided into two bundles to be transmitted along the second long-armed optical fiber and the second galianconism optical fiber respectively, and multiple phase modulation are loaded in transmission process Voltage carries out phase-modulation to a branch of light pulse of the transmission along the second galianconism optical fiber, after end of transmission, after phase-modulation Light pulse interfered with unmodulated light pulse；
The second controller receives reception the second light intensity detection device output of the second light intensity detection device output Collected interference 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；
First photoswitch in the closure state, first controller first laser modulation treatment described in secondary control again Device is executed Laser Modulation into light pulse, and the pulsewidth of light pulse is less than pulse by the first long-armed optical fiber of interference ring and the Then light pulse is divided into two bundles respectively along the first long-armed optical fiber and the first galianconism light by caused time difference when one galianconism optical fiber Fibre is transmitted；And it is fixed in transmission process and loads the corresponding phase modulation voltage in one of them first operating point 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 end of transmission, two-beam pulse passes through through a Long haul fibers described respectively The second laser modulation treatment device is incident to after optical attenuator；
It is short along the second long-armed optical fiber and second that two-beam pulse is divided into four bundles light pulse by the second laser modulation treatment device Arm optical fiber is transmitted, and is loaded multiple phase modulation voltages in transmission process and transmitted to elder generation along long-armed optical fiber, after along the second galianconism A branch of light pulse of optical fiber carries out phase-modulation, after end of transmission, makes first after the first long-armed optical fiber along the second galianconism optical fiber Light pulse is interfered with the light pulse first after the first galianconism optical fiber along the second long-armed optical fiber；
The second controller receive again after the collected interference of the second light intensity detection device output in multiple Multiple light intensity of 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 finds out one and the associated phase modulation electricity of one of them second odd-job point from joint light pulse interference curve Press corresponding point, and by joint light pulse interference curve with the associated phase modulation voltage of the point and corresponding to this point second The difference of the associated phase modulation voltage of odd-job point obtains phase drift parameter, adjusts the second phase according to the phase drift parameter Second odd-job point of position modulator obtains the second operating point, completes phase compensation procedure；
Four first operating points are respectively that the first light pulse interference curve is in 0 phase, pi/2 phase, π phase and 3 pi/2s Corresponding four the first phase modulation voltage values when phase, wherein 0 phase is very big for light intensity value in one cycle The corresponding phase of the first phase modulation voltage value when value, the π phase is light intensity value in one cycle when being minimum the The corresponding phase of one phase modulation voltage value, the pi/2 phase, 3 pi/2 phases are light intensity value in one cycle in maximum Phase corresponding with the first phase modulation voltage value when the half value point among minimum；
Four second odd-job points be respectively the second light pulse interference curve be in 0 phase, pi/2 phase, π phase and Corresponding four the second phase modulation voltage values when 3 pi/2 phase, wherein 0 phase is that light intensity value in one cycle is The corresponding phase of the second phase modulation voltage value when maximum, the π phase is light intensity value in one cycle when being minimum The corresponding phase of the second phase modulation voltage value, the pi/2 phase, 3 pi/2 phases are that light intensity value in one cycle is in pole It is big to be worth phase corresponding with the second phase modulation voltage value when the half value point among minimum.
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