CN106788849A - A kind of delay compensation method for adaptive optic fiber length in quantum key dispatching system - Google Patents
A kind of delay compensation method for adaptive optic fiber length in quantum key dispatching system Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J3/00—Time-division multiplex systems
- H04J3/02—Details
- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0682—Clock or time synchronisation in a network by delay compensation, e.g. by compensation of propagation delay or variations thereof, by ranging
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/07—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems
- H04B10/075—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal
- H04B10/077—Arrangements for monitoring or testing transmission systems; Arrangements for fault measurement of transmission systems using an in-service signal using a supervisory or additional signal
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/70—Photonic quantum communication
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Abstract
The invention provides a kind of compensation of delay apparatus and method for adaptive optic fiber length in quantum key dispatching system, device includes transmitting terminal, receiving terminal and positioned at simple optical fiber between the two, and the transmitting terminal includes：Processor, timer, classical light laser, synchronous light laser, quantum light laser, voltage-controlled attenuator, wavelength division multiplexer and classical light photo-detector；Method includes：Fiber channel is found range and time delay is calculated and compensated.The present invention is in quantum key dispatching system, according to different fiber channel length, measure and calculate the relative time delay of synchronizable optical and quantum light, then compensation of delay is added in transmitting terminal, the time delay drifting problem that light sources with different wavelengths transmission speed difference is caused in same optical fiber is solved using the method for Active Compensation, the stability that error code even ensures system operation is reduced.
Description
Technical field
The invention belongs to quantum key distribution technology field, and in particular to one kind is for adaptive in quantum key dispatching system
The delay compensation method of fiber lengths is answered, for measuring and the relative time delay of synchronizable optical and quantum light is calculated, and added in transmitting terminal
Enter compensation of delay.
Background technology
In quantum key dispatching system, can more by force be called synchronizable optical, be used for using two kinds of light of different wave length, a kind of light intensity
Opened the door to receiving terminal single-photon detector；Another kind is that light intensity attenuation is called quantum light to single photon level, for transmission capacity
Sub-information.Transmitting terminal can adjust two kinds of relative time delays of light when both light are sent according to running situation, make two
Person's spaced a period of time, it is to avoid interference of the synchronizable optical to quantum light.Wherein quantum light can be dry by a F-M in transmitting terminal
Ring is related to, two quantum light of correlation are produced, actual transmission signal is as shown in Figure 1 on optical fiber.
Transmitting terminal sends data according to T1, T2, T3 time interval in the ideal case, when receiving terminal can also receive identical
Between be spaced photon sequence.But, because the wavelength of synchronizable optical and quantum light is inconsistent, two kinds of light speed in a fiber is not
The same.Cause synchronizable optical can proportion sub-light it is advanced, in quantum key dispatching system, if light pulse repetition rate it is not high and
When fiber channel length is shorter, the relative displacement between synchronizable optical and quantum light can be ignored not with the cycle phase ratio of light pulse
Meter, but in the quantum key dispatching system more long more than 100MHz repetition rates or fiber channel, displacement between the two
Same magnitude is reached with the cycle, synchronizable optical and quantum electrical distance are closely even overlapping, and now quantum light can be subject to more tight
The crosstalk of weight, causes the bit error rate to rise or even causes the system cannot normal work.Therefore, a kind of compensation quantum key how is designed
The system and method for the relative time delay of synchronizable optical and quantum light turn into the problem of this area urgent need to resolve in distribution system.
The content of the invention
The present invention in view of the shortcomings of the prior art, is designed and developed and be a kind of for self adaptation in quantum key dispatching system
The compensation of delay apparatus and method of fiber lengths, wherein, according to different fiber channel length, measure and calculate synchronizable optical and amount
The relative time delay of sub-light, then adds compensation of delay in transmitting terminal, relative position when making both reach receiving terminal and preferable feelings
Condition is consistent, it is to avoid synchronizable optical produces crosstalk to quantum light.Solve the light sources with different wavelengths transmission speed in same optical fiber different
The time delay drifting problem for causing.
In order to solve the above technical problems, the technical solution adopted by the present invention is：It is close for quantum the invention provides one kind
The delay compensation method of adaptive optic fiber length in key distribution system.Embodiments in accordance with the present invention, realize the device of the method
Including transmitting terminal, receiving terminal and positioned at simple optical fiber between the two, the transmitting terminal includes：Processor, timer, classics
Light laser, synchronous light laser, quantum light laser, voltage-controlled attenuator, wavelength division multiplexer and classical light photo-detector, it is special
Levy and be, the described method comprises the following steps：
1) fiber channel range finding：
A) timer of transmitting terminal and receiving terminal is opened,
B) transmitting terminal sends one group of light data using classical light laser, while data are sent, to transmitting terminal regularly
Device is sampled, and is T between clocking1；
C) when receiving terminal receives this group of data, receiving terminal timer is sampled, is T between clocking2；
d）Receiving terminal is parsed to entering signal, package, then returns one group of data to transmitting terminal, and while sending, it is right
Receiving terminal timer is sampled, and is T between clocking3；
e）When transmitting terminal receives return data, transmitting terminal timer is sampled again, be T between clocking4；
f）According to formula：, calculate propagation time of the classical light on channel：
g）According to formula：, the length L of the simple optical fiber channel is calculated, wherein, C is the light velocity of the light in vacuum；
2) time delay is calculated and compensated：
h）According to abbe number formula, the abbe number M of 1550nm wavelength bands is calculated, wherein, it is described
M0It is -0.095, λ0It is zero-dispersion wavelength, λ in optical fiber0It is 1300nm；
i）According to formula, calculate the difference in the propagation time of synchronizable optical and quantum light in the optical fiber
Value, wherein the λ1It is synchronous optical wavelength, λ2It is quantum optical wavelength,
j）By synchronizable optical and the propagation time difference of quantum light, be loaded into the path of synchronizable optical so that synchronizable optical with followed by
The spacing result of quantum light be：T1’= T1+ Δ T, synchronizable optical is with the spacing result of previous quantum light：
T3’= T3- Δ T, wherein, T1 ' and T3 ' is respectively the time after compensation.
Embodiments in accordance with the present invention, before the range finding, also including classical optical handshake access phase, wherein, regulation
The decay of transmitting terminal voltage-controlled attenuator so that under conditions of minimum luminous power is sent, the receiving terminal bit error rate is less than 10-6。
Embodiments in accordance with the present invention, after the time delay is calculated and is compensated, also including test phase, by checking this
When error rate of system or the dark counting of test receiving terminal single-photon detector test the effect of compensation.
Embodiments in accordance with the present invention, when testing the dark counting of receiving terminal single-photon detector, turn off quantum light laser,
Synchronizable optical is only sent, judges whether identical with the dark counting of single-photon detector to count.
Embodiments in accordance with the present invention, it is for distance measurement request that transmitting terminal sends one group of light data using classical light laser
Ethernet bag, the Ethernet bag only carry mark distance measurement request type information；One group of data of the receiving terminal passback
It is the range finding return bag for response, the return bag carries the information of mark range finding acknowledgement type.
Embodiments in accordance with the present invention, the step d）Return data include the double sampling knot of receiving terminal timer
The difference of fruit T3 and T2。
Embodiments in accordance with the present invention, the step j）In, by the triggering clock phase shift of FPGA, or by outside time delay
The mode of chip, is loaded into the path of synchronizable optical.
Embodiments in accordance with the present invention, the processor is FPGA.
Embodiments in accordance with the present invention, for the first time during operation quantum key distributing equipment, first carry out optical fiber distance measuring by FPGA,
Then in recording data in FLASH, and the time delay of synchronizable optical, quantum light is adjusted in transmitting terminal according to different fiber lengths, it is right
It carries out phase compensation.
The beneficial effects of the present invention are：
1）In quantum key dispatching system, the light sources with different wavelengths in same optical fiber is solved using the method for Active Compensation and is passed
The time delay drifting problem that defeated speed difference is caused, reduces the stability that error code even ensures system operation.
2）Using the range-measurement system being made up of FPGA and timer, not only system architecture is simple, and due to not operated
Systematic influence, time precision is only influenceed by small time delay on circuit, and measurement proves time precision<100ns, is converted into length,
Optical fiber length measuring error lengths are in tens of meters of magnitudes.
Brief description of the drawings
Fig. 1 is Optical Fiber Transmission light signal schematic diagram in the prior art.
Fig. 2 is the structure chart of single fiber systems transmitting terminal of the present invention.
Fig. 3 carries out optical fiber distance measuring schematic diagram for FPGA of the present invention.
Fig. 4 is compensation of delay schematic diagram of the present invention.
Fig. 5 is present invention classics light EVOA scanning process schematic diagrames.
Specific embodiment
In order that those skilled in the art more fully understand technical scheme, with reference to specific embodiment to this
Invention is described in further detail.The embodiments described below is exemplary, is only used for explaining the present invention, without being understood that
It is limitation of the present invention.Unreceipted particular technique or condition in embodiment, according to the skill described by document in the art
Art or condition are carried out according to product description.
According to an aspect of the present invention, the invention provides one kind for adaptive optic fiber in quantum key dispatching system
The device and method of the compensation of delay of length, the device includes transmitting terminal, receiving terminal and positioned at simple optical fiber between the two.
Fig. 2 is the structure chart of the single fiber systems transmitting terminal, as shown in Fig. 2 the transmitting terminal includes：Processor, timer, classical light swash
Light device, synchronous light laser, quantum light laser, voltage-controlled attenuator, wavelength division multiplexer and classical light photo-detector, the place
Reason device is preferably FPGA.As illustrated, classical light, three kinds of light of wavelength of synchronizable optical and quantum light converge to same by WDM
Trunk optical fiber travels to receiving terminal, while reaching the purpose of classical optic communication and quantum communications, the channel length of three kinds of light is basic
It is identical, therefore the light of any one wave band can be utilized to measure channel length, and synchronizable optical is calculated according to measurement result
Relative time delay after being propagated in the channel of the length with quantum light.In the present invention, classical light light intensity regulating flexibly, seal by data
Pack arrangement is perfect, therefore is found range from this wavelength light source is received and dispatched.
According to a particular embodiment of the invention, the method for being compensated using said apparatus includes following two main steps
Suddenly：
First, fiber channel range finding：
The classical communication of transmitting terminal and receiving terminal need to be the fiber channel of L, the distance of measurement transmitting terminal to receiving terminal by length
L, simplest method is exactly to measure the time that light is transferred to receiving terminal needs from transmitting terminal, in quantum key dispatching system,
The fiber lengths that we use are general<90km, so obtaining the key that accurate Δ t is range finding.In high precision（Ns grades or us
Level）Time synchronization technique such as gps time synchronization, not only need equipment to increase new module, and to position that equipment is installed
Also require.Due in the present invention, it is necessary to simply relative time it is poor, so simply FPGA addition one timer module
Counted.Fig. 3 carries out optical fiber distance measuring schematic diagram for FPGA of the present invention, as shown in figure 3, concrete operations mode is as follows：
A) timer of transmitting terminal and receiving terminal is opened.
B) transmitting terminal sends one group of light data using classical light laser, while data are sent, to transmitting terminal
Timer is sampled, and is T between clocking1, and the time can be kept in local.
According to a preferred embodiment of the invention, it is for finding range that transmitting terminal sends one group of light data using classical light laser
The Ethernet bag of request, the Ethernet bag only carries the information of mark distance measurement request type.
C) when receiving terminal receives this group of data, receiving terminal timer is sampled, is T between clocking2, and can
It is local so that the time to be kept in.
d）Receiving terminal is parsed to entering signal, package, then returns one group of data to transmitting terminal, and same what is sent
When, receiving terminal timer is sampled, it is T between clocking3。
According to a preferred embodiment of the invention, one group of data of the receiving terminal passback are the range finding return for response
Bag, the return bag carries the information of mark range finding acknowledgement type, also, return data includes adopting twice for receiving terminal timer
The difference of sample result T3 and T2。
e）When transmitting terminal receives return data, transmitting terminal timer is sampled again, be T between clocking4；
f）According to formula：, calculate propagation time of the classical light on channel：
g）According to formula：, the length L of the simple optical fiber channel is calculated, wherein, C is the light velocity of the light in vacuum.
Due to using timer calculating relative time poor, and whole process is not influenceed by FPGA controls by operating system,
Time precision is only influenceed by small time delay on circuit, and measurement proves time precision<100ns, is converted into length, and fiber lengths are surveyed
Amount error lengths are in tens of meters of magnitudes.Tens meters of range error can be in the entire system what is ignored.
2nd, time delay is calculated and compensated：
According to a particular embodiment of the invention, after the completion of range finding, it is possible to according to light velocity computing formula and the actual measurement knot of combination
Time delay of the fruit to synchronizable optical and quantum light is compensated, so that it is determined that the compensation of delay value Δ T of synchronizable optical and quantum light.Specific meter
Calculation mode is as follows：
h）According to abbe number formula, the abbe number M of 1550nm wavelength bands is calculated, wherein, it is described
M0It is -0.095, λ0It is zero-dispersion wavelength, λ in optical fiber0It is 1300nm.
i）According to formula, calculate the propagation time of synchronizable optical and quantum light in the optical fiber
Difference, wherein the λ1It is synchronous optical wavelength, λ2It is quantum optical wavelength.
According to a preferred embodiment of the invention, transmitting terminal sends number according to T1, T2, T3 time interval in the ideal case
According to receiving terminal can also receive the photon sequence at same time interval.But, in fact due to synchronizable optical and quantum light wavelength not
Unanimously, two kinds of light speed in a fiber is different.By abbe number formula：
... ... formula 1
Wherein, slope M0About -0.095ps/ (nm2x km),λ0It is zero-dispersion wavelength, the unit of all wavelengths is all in formula
nm.Usual producer can provide M0And λ0Value, λ in optical fiber0It is 1300nm.According to formula 1, in the dispersion of 1550nm wavelength bands
Coefficient
Thus can calculate in 90km fiber lengths, synchronizable optical（λ1=1550.92nm）With quantum light（λ2=1549.32nm）Biography
Defeated delay inequality is：
... ... formula 2
Through measurement, under 90km fiber lengths environment, synchronizable optical（λ=1550.92nm）Can proportion sub-light（λ=1549.32nm）It is super
Preceding 2.5ns, it is substantially uniform with result of calculation.
j）By synchronizable optical and the propagation time difference of quantum light, be loaded into the path of synchronizable optical so that synchronizable optical with follow closely
The spacing result of quantum light thereafter is：T1’= T1+ Δ T, the spacing result of synchronizable optical and previous quantum light
For：T3’= T3- Δ T, wherein, T1 ' and T3 ' is respectively the time after compensation.According to a preferred embodiment of the invention, pass through
The triggering clock phase shift of FPGA, or by way of outside delay chip, it is loaded into the path of synchronizable optical.
According to a particular embodiment of the invention, Fig. 4 is compensation of delay schematic diagram of the present invention, can adjust same by transmitting terminal
The time interval that step light and quantum light send sequence reaches receiving terminal sequence time spaced equalized.As shown in figure 4, synchronizable optical with it is tight
Spacing result with quantum light thereafter is：T1 '=T1+ Δ T, the spacing knot of synchronizable optical and previous quantum light
It is really：T3’=T3-ΔT.
According to a particular embodiment of the invention, the compensation method only need to be in quantum key dispatching system again networking or change
Operation once, is then preserved into non-volatile device measurement result during channel（Such as FLASH）, and will in upper electricity or reset
The result is loaded into compensation of delay function.The preferred embodiment of the invention, for the first time during operation quantum key distributing equipment, first
Optical fiber distance measuring is carried out by FPGA, in then recording data in FLASH, and adjusts synchronous in transmitting terminal according to different fiber lengths
The time delay of light, quantum light, phase compensation is carried out to it.The method does not need extra device in single fiber quantum key dispatching system
Part and time overhead, will not impact to cost and device efficiency.
According to a particular embodiment of the invention, classical optical handshake connection rank can also be included before the fiber channel range finding
Section, in single fiber systems, the handshake procedure of classical light is exactly mainly the decay for adjusting transmitting terminal EVOA, and adjusting this decay need to expire
Foot：The receiving terminal bit error rate is set to be less than 10 under conditions of minimum luminous power is sent-6.Fig. 5 is present invention classics light EVOA scannings
Process schematic, as illustrated, the regulating step of EVOA decay is as follows：
1a）Transmitting terminal sends multiple packets.
1b）Reduce the decay of classical photoelectric control attenuator.
1c）Receiving terminal receives classical light data bag, and verifies and count.
1d）Judge whether the packet for receiving is identical with transmitting terminal and without error code.
1e）Set the value of voltage-controlled attenuator.
Transmitting terminal sends classical light data bag according to minimum optical power, and the data packet number that receiving terminal will be received is returned to
Transmitting terminal.The data packet number that receiving terminal is received can increase as light intensity strengthens, but classical light light intensity can be to quantum light
Influence is produced, so in invention, we can find an equalization point, minimum transmission is used in the case where the bit error rate is ensured
End luminous power.After the completion of classical light EVOA scanning, represent that classical light has been shaken hands completion, data link is stablized perfect, can be carried out
Range finding.
According to a particular embodiment of the invention, after the time delay is calculated and is compensated, test phase can also be included, is led to
Cross and check the dark counting of now error rate of system or test receiving terminal single-photon detector and test the effect of compensation.According to this
The preferred embodiment of invention, checks in the now mode of error rate of system, if in repetition rate system higher, after compensation by mistake
Code check has decline；In the mode of the dark counting for testing receiving terminal single-photon detector, quantum light laser is turned off in test,
Synchronizable optical is only sent, before compensation, because synchronizable optical can produce interference to quantum light, now counting can be darker than single-photon detector
Count high；After compensation, count substantially to be consistent with dark counting.
Inventor has found that the method according to embodiments of the present invention, according to different fiber channel length, is measured and calculated
The relative time delay of synchronizable optical and quantum light, then adds compensation of delay in transmitting terminal, relative position when making both reach receiving terminal
Put consistent with ideal situation.In solving existing quantum key dispatching system, not to synchronizable optical and quantum light by long distance
The problem of time delay is caused from Optical Fiber Transmission, and using the range-measurement system being made up of FPGA and timer, system architecture is simple, behaviour
Facilitate, reduce the stability that error code even ensures system operation.
In the description of the invention, it is to be understood that term " first ", " second " are only used for describing purpose, and can not
It is interpreted as indicating or implying relative importance or the implicit quantity for indicating indicated technical characteristic.Thus, define " the
One ", one or more this feature can be expressed or be implicitly included to the feature of " second ".
In the present invention, unless otherwise clearly defined and limited, term " installation ", " connected ", " connection ", " fixation " etc.
Term should be interpreted broadly, for example, it may be fixedly connected, or be detachably connected, or integrally；Can be that machinery connects
Connect, or electrically connect；Can be joined directly together, it is also possible to be indirectly connected to by intermediary, can be in two elements
The connection in portion or two interaction relationships of element.For the ordinary skill in the art, can be according to specific feelings
Condition understands above-mentioned term concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature " on " or D score can be with
It is the first and second feature directly contacts, or the first and second features are by intermediary mediate contact.And, fisrt feature exists
Second feature " on ", " top " and " above " but fisrt feature are directly over second feature or oblique upper, or be merely representative of
Fisrt feature level height is higher than second feature.Fisrt feature second feature " under ", " lower section " and " below " can be
One feature is immediately below second feature or obliquely downward, or is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show
The description of example " or " some examples " etc. means to combine specific features, structure, material or spy that the embodiment or example are described
Point is contained at least one embodiment of the invention or example.In this manual, to the schematic representation of above-mentioned term not
Identical embodiment or example must be directed to.And, the specific features of description, structure, material or feature can be any
Combined in an appropriate manner in individual or multiple embodiments or example.Additionally, in the case of not conflicting, the skill of this area
Art personnel can be tied the feature of the different embodiments or example described in this specification and different embodiments or example
Close and combine.
Although embodiments of the invention have been shown and described above, it is to be understood that above-described embodiment is example
Property, it is impossible to limitation of the present invention is interpreted as, one of ordinary skill in the art within the scope of the invention can be to above-mentioned
Embodiment is changed, changes, replacing and modification, simultaneously for those of ordinary skill in the art, according to the think of of the application
Think, will change in specific embodiments and applications.
Claims (9)
1. a kind of delay compensation method for adaptive optic fiber length in quantum key dispatching system, realizes the device of the method
Including transmitting terminal, receiving terminal and positioned at simple optical fiber between the two, the transmitting terminal includes：Processor, timer, classics
Light laser, synchronous light laser, quantum light laser, voltage-controlled attenuator, wavelength division multiplexer and classical light photo-detector, it is special
Levy and be, the described method comprises the following steps：
1) fiber channel range finding：
A) timer of transmitting terminal and receiving terminal is opened,
B) transmitting terminal sends one group of light data using classical light laser, while data are sent, to transmitting terminal regularly
Device is sampled, and is T between clocking1；
C) when receiving terminal receives this group of data, receiving terminal timer is sampled, is T between clocking2；
d）Receiving terminal is parsed to entering signal, package, then returns one group of data to transmitting terminal, and while sending, it is right
Receiving terminal timer is sampled, and is T between clocking3；
e）When transmitting terminal receives return data, transmitting terminal timer is sampled again, be T between clocking4；
f）According to formula：, calculate propagation time of the classical light on channel：
g）According to formula：, the length L of the simple optical fiber channel is calculated, wherein, C is the light velocity of the light in vacuum；
2) time delay is calculated and compensated：
h）According to abbe number formula, the abbe number M of 1550nm wavelength bands is calculated, wherein, it is described
M0It is -0.095, λ0It is zero-dispersion wavelength, λ in optical fiber0It is 1300nm；
i）According to formula, calculate the difference in the propagation time of synchronizable optical and quantum light in the optical fiber
Value, wherein the λ1It is synchronous optical wavelength, λ2It is quantum optical wavelength,
j）By synchronizable optical and the propagation time difference of quantum light, be loaded into the path of synchronizable optical so that synchronizable optical with followed by
The spacing result of quantum light be：T1’= T1+ Δ T, synchronizable optical is with the spacing result of previous quantum light：
T3’= T3- Δ T, wherein, T1 ' and T3 ' is respectively the time after compensation.
2. method according to claim 1, it is characterised in that before the range finding, also connects including classical optical handshake
Stage, wherein, adjusting the decay of transmitting terminal voltage-controlled attenuator so that under conditions of minimum luminous power is sent, receiving terminal is missed
Code check is less than 10-6。
3. method according to claim 1, it is characterised in that the time delay calculate and compensation after, also including test
Stage, by the effect for checking the dark counting of now error rate of system or test receiving terminal single-photon detector to test compensation.
4. method according to claim 3, it is characterised in that during the dark counting of test receiving terminal single-photon detector, close
Fall quantum light laser, only send synchronizable optical, judge whether identical with the dark counting of single-photon detector to count.
5. method according to claim 1, it is characterised in that transmitting terminal sends one group of light data using classical light laser
It is the Ethernet bag for distance measurement request, the Ethernet bag only carries the information of mark distance measurement request type；The receiving terminal
One group of data of passback are the range finding return bag for response, and the return bag carries the information of mark range finding acknowledgement type.
6. method according to claim 1, it is characterised in that the step d）Return data include receiving terminal regularly
The difference of double sampling the result T3 and T2 of device。
7. method according to claim 1, it is characterised in that the step j）In, by the triggering clock phase shift of FPGA,
Or by way of outside delay chip, it is loaded into the path of synchronizable optical.
8. method according to claim 1, it is characterised in that the processor is FPGA.
9. method according to claim 7, it is characterised in that for the first time during operation quantum key distributing equipment, first by
FPGA carries out optical fiber distance measuring, in then recording data in FLASH, and adjusts synchronous in transmitting terminal according to different fiber lengths
The time delay of light, quantum light, phase compensation is carried out to it.
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