CN110601833B - Quantum cipher communication system with adaptive transmission distance - Google Patents
Quantum cipher communication system with adaptive transmission distance Download PDFInfo
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- CN110601833B CN110601833B CN201910938656.0A CN201910938656A CN110601833B CN 110601833 B CN110601833 B CN 110601833B CN 201910938656 A CN201910938656 A CN 201910938656A CN 110601833 B CN110601833 B CN 110601833B
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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
- H04B10/60—Receivers
- H04B10/61—Coherent receivers
- H04B10/616—Details of the electronic signal processing in coherent optical receivers
- H04B10/6161—Compensation of chromatic dispersion
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- 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
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- 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
- H04L9/0819—Key transport or distribution, i.e. key establishment techniques where one party creates or otherwise obtains a secret value, and securely transfers it to the other(s)
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- 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
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Abstract
The invention discloses a quantum cipher communication system with self-adaptive transmission distance, which comprises a quantum key sending system; a communication channel and a quantum key receiving system; the system also comprises an adjustable dispersion management module arranged in the quantum key sending system and/or the quantum key receiving system; when the system runs or the length of the communication optical fiber is changed, the adjustable dispersion management module is used for dynamically adjusting the dispersion compensation quantity of the compensation pulse laser, so that the compensation dispersion quantity of the pulse laser input into the communication channel is equivalent to the dispersion quantity introduced by the communication channel optical fiber. The invention controls the pulse broadening amount caused by system dispersion through the light source management module, reduces the influence of dispersion on the communication distance and the communication speed, and simultaneously, the adjustable dispersion compensation module is pre-deployed in the system, so that the dispersion amount under different communication distances can be matched; by feedback tracking of the system bit error rate, optimal dispersion compensation is dynamically implemented, and quantum secret communication at different distances in a laboratory and an external field test is supported.
Description
Technical Field
The invention relates to a quantum communication system, in particular to a quantum cryptography communication system with self-adaptive transmission distance.
Background
The quantum information technology has been developed rapidly in recent years, and has been put to practical use step by step as the quantum secret communication technology with the most industrial feasibility. With the adoption of the Jinghusu trunk line, a quantum secret communication network is gradually established in the industry sensitive to communication security. For quantum secure communication networks, the most rigid requirements at this stage are higher speed and longer distance, both of which are limited by the influence of fiber dispersion: pulse broadening caused by dispersion causes difficulty in recovering pulse time sequence of a high-speed system, and limits the speed of the system; the dispersion increases with the increase of the transmission distance, which limits the performance of the system under long-distance communication, so that the code rate of the system is reduced and even the system is difficult to operate. Dispersion compensation is therefore essential in quantum secure communications, especially in long-distance secure communications networks.
At this stage, two more sophisticated dispersion compensation schemes are Dispersion Compensation Fiber (DCF) based and chirped grating (CFBG) based.
The scheme based on the dispersion compensation optical fiber uses the dispersion compensation optical fiber at a transmitting end, a line or a receiving end in the system. The dispersion quantity introduced by the dispersion compensation fiber is matched with the dispersion quantity introduced by the communication channel fiber, so that a good compensation effect is obtained. But such compensation schemes have significant disadvantages. Firstly, the dispersion compensation amount and the dispersion compensation optical fiber length are in positive correlation in the scheme, so when the dispersion amount introduced into a long-distance communication channel is large, the required DCF length is longer, and the DCF transmission attenuation coefficient is large, which can cause the insertion loss of the whole module to increase linearly along with the module compensation dispersion amount. Secondly, the dispersion coefficient of the DCF is about 100-200 ps/km/nm, that is, if a communication optical fiber with a transmission length of 100km needs to be compensated, the DCF with the transmission length of more than 10km is needed, and the optical fiber disc has large volume and heavy weight, is not beneficial to being integrated into communication equipment and needs to be carried outside the system independently. Third, the dispersion compensation amount of each dispersion compensation module is a fixed value, and if the practical communication distance changes, the dispersion compensation module of the corresponding length needs to be replaced, and a single module does not have the universal applicability to the distance. Meanwhile, the compensation amount of a single module is fixed, and the lengths of the optical fibers are not strictly matched, so that the compensation accuracy of dispersion compensation is insufficient.
Another preferred dispersion compensation scheme is based on chirped gratings. The chirp grating dispersion compensation module introduces fixed attenuation, does not increase along with long distance and has small volume. However, this solution also faces a problem that the compensation distance of each module is fixed, there is no arbitrary distance applicability, and the compensation precision is not adjustable.
Therefore, a quantum secret communication system based on light source management and dispersion management is provided, pulse broadening caused by system dispersion is controlled through light source spectrum management, the influence of dispersion on communication distance is reduced, and meanwhile, an adjustable dispersion compensation module is pre-deployed in the communication system, so that dispersion quantities under different communication distances can be matched with high precision. By feedback tracking of the system bit error rate, optimal dispersion compensation is dynamically implemented, and quantum secret communication at different distances in a laboratory and an external field test is supported.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a quantum cryptography communication system with a self-adaptive transmission distance, which controls the pulse broadening quantity caused by system dispersion through a light source management module, reduces the influence of dispersion on the communication distance and the communication speed, and simultaneously pre-disposes an adjustable dispersion compensation module in the system, so that the dispersion quantity under different communication distances can be matched; by feedback tracking of the system bit error rate, optimal dispersion compensation is dynamically implemented, and quantum secret communication at different distances in a laboratory and an external field test is supported.
In order to achieve the technical purpose, the invention adopts the technical scheme that: the quantum cipher communication system with self-adapting transmission distance comprises a quantum key sending system; a communication channel and a quantum key receiving system; the quantum key sending system comprises a light source module, an encoding module and a light beam management module; except that the light source module is placed at the head, other modules in the system can replace the sequence under the condition of function permission; the quantum key receiving system comprises a receiving module and a decoding module, the quantum key receiving system is used for receiving a quantum key and decoding key information, the receiving module is used for receiving signals, and the decoding module is used for decoding the coded information received by the receiving module to obtain a key; the light source module is used for outputting pulse laser as a light source of a quantum secret communication system based on light source management and dispersion management; the encoding module is used for encoding information to be encoded on parameters of the pulse laser output by the light source module; the light source management module comprises a light intensity management module and a spectrum management module; the light intensity management module is used for managing the light beam intensity of the pulse laser output by the light source module and ready to enter the communication channel; the spectrum management module is used for managing the spectrum of the pulse laser output by the light source module and ready to enter the communication channel; the managing of the beam intensity includes: 1) attenuating the intensity of the light source to ensure that the light intensity entering the communication channel is in a single photon level; 2) the output light is used as feedback to ensure the stability of the output light intensity of the quantum key sending system; 3) in quantum key distribution equipment based on a decoy state, regulating and controlling a vacuum state, a decoy state, a signal state light intensity ratio and a ratio; the spectrum management means that the spectrum filtering is within the working bandwidth range of all devices of the system; the method is characterized in that: the system also comprises an adjustable dispersion management module arranged in the quantum key sending system and/or the quantum key receiving system; when the system runs or the length of the communication optical fiber is changed, the adjustable dispersion management module is used for dynamically adjusting the dispersion compensation quantity of the compensation pulse laser, so that the compensation dispersion quantity of the pulse laser input into the communication channel is equivalent to the dispersion quantity introduced by the communication channel optical fiber. The spectrum management is to perform a narrowing operation on the pulse spectrum, and includes, but is not limited to, a narrow-band filtering device such as a narrow-band grating filter. Light source spectral management must filter the spectrum within the operating bandwidth of all the devices of the system. Since the amount of pulse width broadening due to the dispersion experienced by the pulses is directly related to the spectral width, spectral narrowing can reduce the effect of the amount of dispersion on the modulation speed of the system. Under the condition of the same modulation speed, the maximum communication distance of the system can be increased by narrowing the spectrum, and the compensation-free communication distance of the system is increased. Meanwhile, in a quantum communication scheme for encoding and decoding based on light interference, the spectral width is reduced, the light coherence length is increased, and the requirements on the manufacturing accuracy of encoding and decoding interference rings are lowered. Conventional communications can generally implement three types of pre-compensation (before the transmission module), line compensation (in the transmission module), and post-compensation (after the transmission module) depending on the position of dispersion compensation in the line. In quantum communication, because of the limitation of security, a single photon needs to be output by a transmitting terminal, the system preferentially adopts the pre-compensation scheme shown in fig. 1, and the adjustable dispersion compensation module is arranged at the transmitting terminal of the quantum key.
Further, the transmission distance adaptive quantum cryptography communication system according to claim 1, wherein: the light source module generates pulse laser through a laser, or generates pulse laser through modulation of an external device.
Further, the light source module comprises at least one laser. According to the design of the encoding and decoding scheme, the number of the lasers contained in the light source module may be more than one.
Further, the optical pulse parameter of the encoded information is a polarization parameter, a phase parameter or a time parameter of the pulsed laser.
Furthermore, the light intensity management module attenuates the intensity of the light source through a fixed attenuator, an intensity modulator and an adjustable attenuator.
When the system runs or the length of the communication optical fiber is changed, the adjustable dispersion management module dynamically adjusts the compensation dispersion amount, so that the compensation dispersion amount is equivalent to the dispersion amount introduced by the communication channel optical fiber, and the compensation dispersion amount is properly and finely adjusted. Based on the scheme, the dispersion management module can realize fine compensation of system dispersion and can also be adaptive to different communication distances. The dispersion management module dispersion amount adjustment process can be described as:
1. and estimating the dispersion compensation quantity of the system according to the communication channel distance and the communication channel dispersion parameters of the system.
2. Setting a dispersion value of a tunable dispersion compensation module as an estimate value
3. And observing the operation condition of the system, and recording the error rate if the system can normally operate. If the operation cannot be carried out, recording the operation failure.
4. The value of the dispersion compensation is adjusted in suitable steps within a suitable range around the estimated value.
5. And obtaining a correlation curve of the error rate and the dispersion compensation quantity when the system can operate, and obtaining a minimum value point of the error rate curve.
6. And determining the value of the dispersion compensation quantity when the error rate is minimum.
7. This dispersion compensation amount is set into the system.
When the initial value of the adjustable dispersion compensation module is not easy to set due to the unknown length of the system optical fiber, the automatic adaptation of the dispersion compensation quantity can be realized through a system scanning algorithm. The process is as follows:
1. within the working range of the adjustable dispersion compensation module, the dispersion compensation amount is increased from small to large according to proper steps.
2. And observing the system running condition when the dispersion amount is changed, and recording the error rate if the system can run normally.
If the operation cannot be carried out, recording the operation failure.
3. Obtaining the correlation curve of the error rate and the dispersion compensation quantity when the system can run, and obtaining the minimum value point of the error rate curve
4. And determining the value of the dispersion compensation quantity when the error rate is minimum.
5. This dispersion compensation amount is set into the system.
When the communication channel is longer, the dispersion introduced by the channel exceeds the compensation range of a single adjustable dispersion compensation module, a mode of cascade connection of a fixed dispersion compensation module and the adjustable dispersion compensation module can be adopted, and the maximum transmission distance supported by the system is improved. And a mode of cascading a plurality of adjustable dispersion compensation modules can be adopted, so that the maximum transmission distance supported by the system is improved.
The tunable dispersion compensation module can dynamically adjust the dispersion value, and includes but is not limited to a tunable dispersion module based on a G-T etalon. The tunable dispersion compensation module may need a plurality of, even different, specifications according to the number of optical fiber paths used by the system. The communication channel is the communication link required by the quantum secret key sending and quantum key receiving system to transmit signals. Typically a communication fiber, but may also be a spatial light path. The quantum key receiving system is used for receiving a quantum key and decoding key information, and comprises a receiving module and a decoding module. The receiving module is used for receiving signals, and the decoding module is used for decoding the received coded information to obtain a secret key.
Has the advantages that: the invention is provided with the light source management module, can narrow the spectrum of the system, reduce the pulse width broadening amount during long-distance transmission, improve the capability of the system for resisting dispersion broadening, and reduce the influence of the dispersion amount on the modulation speed of the system; under the condition of the same modulation speed, the limiting effect of chromatic dispersion on the maximum communication distance is inhibited, and the compensation-free communication distance of the system is enhanced. In a quantum communication scheme for encoding and decoding based on light interference, the spectral width is reduced, the coherence length of light is increased, and the requirements on the manufacturing accuracy of an encoding and decoding interference ring are lowered. The dispersion management module based on the adjustable dispersion compensation device can finely compensate the system dispersion and optimize the system parameters. When the length of a communication channel changes, the optimal dispersion compensation quantity of the system is flexibly scanned, the system has self-adaptability under multiple communication distances, and a plurality of dispersion compensation modules are not required to be equipped.
Drawings
FIG. 1 is a schematic diagram of a structure based on pre-compensation according to the present invention.
Fig. 2 is a schematic diagram of a structure based on line compensation according to the present invention.
Fig. 3 is a schematic diagram of the structure based on post compensation according to the present invention.
Fig. 4 is a schematic diagram of the structure of the present invention based on joint compensation.
Fig. 5 is a schematic structural view of embodiment 1 of the present invention.
Fig. 6 is a graph of bit error rate versus dispersion compensation based on pre-compensation according to the present invention.
Fig. 7 is a graph of bit error rate versus dispersion compensation based on pre-compensation according to the present invention.
Detailed Description
The present invention is further illustrated by the following description in conjunction with the accompanying drawings, which are to be construed as merely illustrative and not limitative of the remainder of the disclosure, and on reading the disclosure, various equivalent modifications thereof will become apparent to those skilled in the art and fall within the limits of the appended claims.
Example 1
As shown in fig. 1, fig. 5, fig. 6 and fig. 7, the transmission distance adaptive quantum cryptography communication system includes a quantum key transmission system, a communication channel and a quantum key reception system; the quantum key sending system mainly comprises a light source module, an encoding module, a light beam management module and an adjustable dispersion management module; wherein, except the light source module is placed at the head, other modules in the system can replace the sequence under the condition of function permission. The light source module outputs pulse laser as a light source of the whole system. The pulse light is obtained by directly driving the DFB laser by an electric signal. The pulse repetition frequency was 1 GHz. The encoding module is used for encoding information to be encoded on a certain parameter of the pulse laser, and the encoding mode adopted is phase encoding. The light source management module is used for managing the intensity and the spectrum of the light beam which is ready to enter the communication channel. The light intensity management in the system comprises three functions, namely, the light intensity attenuation is realized, the light intensity entering a transmission channel is ensured to be about 0.6 single photon level, and the light intensity attenuation is realized through a 30dB fixed attenuator and a 40dB adjustable attenuator. Meanwhile, a beam splitter is arranged in the light source management module, and a small part of light intensity output light is observed as feedback to ensure that the output light intensity is stable. The light source management module also comprises an intensity modulator which is used for realizing the regulation and control of the vacuum state, the decoy state, the signal state light intensity ratio and the ratio in the quantum key distribution device of the decoy state BB84 system. The spectrum management is to perform a narrowing operation on a pulse spectrum, and generally employs a narrow-band filter device such as a narrow-band grating filter. The amount of pulse width broadening due to the pulses undergoing dispersion is positively correlated with the spectral width. Therefore, the spectrum is narrowed, and the influence of the dispersion amount on the modulation speed of the system can be reduced. Under the condition of the same modulation speed, the maximum communication distance of the system can be increased by narrowing the spectrum, and the compensation-free communication distance of the system is increased. In the embodiment, the spectrum management is realized by adopting a narrow-band grating filter, and the spectrum width after filtering is 0.1 nm. The light source module outputs light with a pulse width of about 0.8nm, so the pulse undergoes dispersion broadening by an amount reduced to about 1/8. In quantum communication, because of the limitation of security, a single photon needs to be output by a transmitting terminal, so that the system preferentially adopts the pre-compensation scheme shown in fig. 1, and a dispersion compensation module is arranged at the transmitting terminal of a quantum key.
The adjustable dispersion compensation module used by the quantum cryptography communication system with the self-adaptive transmission distance is based on the G-T etalon and can realize the dispersion compensation of communication optical fibers within a range of +/-80 km. The communication channel used in this example 1 was a standard g.652 communication fiber, having a length of 50 km. The quantum key receiving system is used for receiving a quantum key and decoding key information, and comprises a receiving module and a decoding module. The receiving module is used for receiving signals, and the decoding module is used for decoding the received coded information to obtain a secret key. The decoding module of the quantum key receiving system is matched with the encoding module of the quantum key sending system. When the system runs or the length of the communication optical fiber is changed, the dispersion management module dynamically adjusts the compensation dispersion amount, so that the compensation dispersion amount is equivalent to the dispersion amount introduced by the communication channel optical fiber and is properly and finely adjusted. Based on the scheme, the adjustable dispersion management module can realize fine compensation of system dispersion and can also be adaptive to different communication distances. Taking an example of the operation of a 50km system, the above adjustment process can be described as:
1. estimating the dispersion compensation quantity of the system according to the communication distance length of a system transmission module and the dispersion parameter of a communication channel, wherein the dispersion compensation quantity is about 900 ps/nm;
2. setting the adjustable dispersion compensation module to an estimated value of 900 ps/nm;
3. the error rate of an observation system is about 3.5%;
4. within the range of about half of the estimated value, i.e. within the range of 900 + -450 ps/nm, the value of the dispersion compensation is adjusted by 50ps/nm steps
5. Obtaining a correlation curve of the error rate and the dispersion compensation quantity, such as figure 6, and obtaining a curve extreme point;
6. and obtaining and setting the value 850ps/km of the dispersion compensation amount at the lowest bit error rate.
When the length of the system optical fiber is unknown or the dispersion estimation is difficult, the initial value of the adjustable dispersion compensation module cannot be set, and the automatic adaptation of the dispersion compensation quantity can be realized through a system scanning algorithm. In this example 1, the process is as follows:
1. within the working range of the adjustable dispersion compensation module [ -1200,1200] ps/nm, from small to large, the dispersion compensation amount is increased progressively according to the steps of 50 ps/nm;
2. recording values of system code rate and bit error rate when the dispersion compensation quantity is increased;
3. obtaining a correlation curve of the error rate and the dispersion compensation quantity, such as fig. 7, and obtaining a curve extreme point;
4. determining the value of dispersion compensation quantity at an extreme point;
5. this dispersion compensation amount is set into the system.
When the communication channel is longer, the dispersion introduced by the channel exceeds the compensation range of a single adjustable dispersion compensation module, a mode of cascade connection of a fixed dispersion compensation module and the adjustable dispersion compensation module can be adopted, and the maximum transmission distance supported by the system is improved. And a mode of cascading a plurality of adjustable dispersion compensation modules can be adopted, so that the maximum transmission distance supported by the system is improved.
Furthermore, as shown in fig. 2, it is also possible in principle to use a line compensation scheme, only sacrificing code rate. As shown in fig. 3, it is in principle also possible to use a post-compensation scheme, only sacrificing the code rate. As shown in fig. 4, it is basically feasible to adopt a joint compensation scheme between the transmitting end and the receiving end, which only sacrifices the code rate.
The scope of the present invention includes, but is not limited to, the above embodiments, and the present invention is subject to the appended claims, and any alterations, modifications, and improvements that can be easily made by those skilled in the art are within the scope of the present invention.
Claims (5)
1. A quantum cipher communication system of self-adapting transmission distance includes quantum key sending system; a communication channel and a quantum key receiving system; the quantum key sending system comprises a light source module, an encoding module and a light beam management module; the quantum key receiving system comprises a receiving module and a decoding module, the quantum key receiving system is used for receiving a quantum key and decoding key information, and the receiving module is used for receiving signals; the decoding module of the quantum key receiving system is matched with the encoding module of the quantum key sending system to work; the decoding module is used for decoding the coded information received by the receiving module to obtain a key; the light source module is used for outputting pulse laser as a light source of a quantum secret communication system based on light source management and dispersion management; the encoding module is used for encoding information to be encoded on parameters of the pulse laser output by the light source module; the light source management module comprises a light intensity management module and a spectrum management module; the light intensity management module is used for managing the light beam intensity of the pulse laser output by the light source module and ready to enter the communication channel; the spectrum management module is used for managing the spectrum of the pulse laser output by the light source module and ready to enter the communication channel; the managing of the intensity of the light beam comprises: 1) attenuating the intensity of the light source to ensure that the light intensity entering the communication channel is in a single photon level; 2) the output light is used as feedback to ensure the stability of the output light intensity of the quantum key sending system; 3) in quantum key distribution equipment based on a decoy state, regulating and controlling a vacuum state, a decoy state, a signal state light intensity ratio and a ratio; the management of the spectrum refers to that the spectrum filtering is within the working bandwidth range of all devices of the system; the method is characterized in that: the system also comprises an adjustable dispersion management module arranged in the quantum key sending system and/or the quantum key receiving system; when the system runs or the length of the communication optical fiber is changed, the adjustable dispersion management module is used for dynamically adjusting and compensating the dispersion compensation quantity of the pulse laser, so that the compensation dispersion quantity of the pulse laser input into the communication channel is equivalent to the dispersion quantity introduced by the communication channel optical fiber;
the dynamic tuning process of the tunable dispersion management module includes:
(1) estimating the dispersion compensation quantity of the system according to the communication channel distance and the communication channel dispersion parameter of the quantum cryptography communication system with the self-adaptive transmission distance, and setting the dispersion value of the adjustable dispersion compensation module as the estimated dispersion compensation quantity;
(2) observing the operation condition of the quantum cryptography communication system with the self-adaptive transmission distance, and recording the bit error rate if the quantum cryptography communication system is normally operated; if the operation cannot be carried out, recording that the operation cannot be carried out;
(3) within the right and left proper range of the estimated dispersion compensation amount, the dispersion compensation amount is adjusted in proper steps, and the step (2) is repeated;
(4) obtaining a correlation curve of the error rate and the dispersion compensation amount when a quantum cryptography communication system with a self-adaptive transmission distance normally operates, and obtaining a minimum value point of the correlation curve;
(5) determining a value of the dispersion compensation amount at a minimum point of the correlation curve;
(6) setting the dispersion compensation amount into a quantum cryptography communication system of a self-adaptive transmission distance;
when the optical fiber length of the quantum cryptography communication system with the self-adaptive transmission distance is unknown, so that the dispersion value of the adjustable dispersion compensation module is not easy to set, the automatic adaptation of the dispersion compensation quantity is realized through the scanning algorithm of the quantum cryptography communication system with the self-adaptive transmission distance, and the process is as follows:
(1) within the working range of the adjustable dispersion compensation module, gradually increasing the dispersion compensation amount from small to large according to proper steps, and sequentially setting the dispersion value of the adjustable dispersion compensation module as the dispersion compensation amount;
(2) observing the operation condition of the quantum cryptography communication system with the self-adaptive transmission distance at each dispersion value, and recording the bit error rate if the quantum cryptography communication system is normally operated;
if the operation cannot be carried out, recording that the operation cannot be carried out; (3) obtaining a correlation curve of the error rate and the dispersion compensation amount when a quantum cryptography communication system with a self-adaptive transmission distance normally operates, and obtaining a minimum value point of the correlation curve;
(4) determining a value of the dispersion compensation amount at a minimum point of the correlation curve;
(5) the dispersion compensation amount is set into a quantum cipher communication system of an adaptive transmission distance.
2. The transmission distance adaptive quantum cryptography communication system according to claim 1, wherein: the light source module generates pulse laser through a laser, or modulates continuous laser into pulse laser through an external device.
3. The transmission distance adaptive quantum cryptography communication system according to claim 1, wherein: the light source module includes at least one laser.
4. The transmission distance adaptive quantum cryptography communication system according to claim 1, wherein: the optical pulse parameter of the encoded information is a polarization parameter, a phase parameter or a time parameter of the pulsed laser.
5. The transmission distance adaptive quantum cryptography communication system according to claim 1, wherein: the light intensity management module attenuates the light source intensity through a fixed attenuator, an intensity modulator and an adjustable attenuator.
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