CN115276824A - Quantum noise stream encryption transmitter, receiver, communication system and method - Google Patents
Quantum noise stream encryption transmitter, receiver, communication system and method Download PDFInfo
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Abstract
The application discloses a quantum noise stream encryption transmitter, a quantum noise stream encryption receiver, a quantum noise stream encryption communication system and a quantum noise stream encryption method. The transmitter mainly comprises a mode-locked laser light source, a dispersion device, a phase modulator, an arbitrary waveform generator, a dispersion compensation optical fiber and an adjustable optical attenuator, wherein the dispersion device realizes time domain broadening of optical pulses, the arbitrary waveform generator generates multilevel cipher text data, and time domain chip-by-chip phase modulation is realized through the phase modulator, namely the time domain phase coding is equivalent to frequency domain phase coding randomly encrypted by quantum noise. The receiver mainly comprises a low noise amplifier, a dispersion device, a phase modulator, an arbitrary waveform generator, a photoelectric detector, a clock data recovery module and a bit error rate test system. The communication system comprises a transmitter and a receiver. The invention can improve the encryption rate and the security.
Description
Technical Field
The present application relates to the field of optical communication technologies, and in particular, to a quantum noise stream encryption transmitter, receiver, communication system, and method.
Background
As an important basis of the information society, the optical fiber communication system carries more than 90% of internet data. The existing protection of network space security is mainly at an application layer, and as the lowest layer of network space security, optical fiber communication faces the threat of signal eavesdropping and tampering from lines or nodes, and physical layer security protection from an optical domain is urgently needed to meet the trusted network communication requirements in the fields of 5G, internet of things, cloud, edge computing and the like. At present, the main technologies for realizing the security of the physical layer of the optical domain include quantum noise random encryption, chaotic optical communication, optical frequency hopping communication, optical hidden communication, spread spectrum optical communication and the like. The quantum noise random encryption is based on a basic protocol Y-00 and combines the quantum mechanics principle and the classical stream cipher idea. On the basis, researchers have proposed a plurality of quantum noise random encryption systems of phase modulation and intensity modulation successively. Driven by coherent optical communication technology, the experiment of northeast university of japan and the university of beijing post and telecommunications has realized the quadrature amplitude modulation scheme, and the university of science and technology in china has reported the pulse amplitude modulation scheme. The above schemes are bit rate bit-by-bit encryption, and in order to further enhance the security of the system, the breakthrough of bit rate encryption can be started. The roman third university proposes a spectral phase-coded quantum noise random encryption system based on a multiple-input multiple-output codec, but the phase change employs an optical phase shifter, the time to switch from one phase to another is much higher than the time period of one bit, and the encryption rate is much lower than the bit rate.
Disclosure of Invention
In view of at least one of the drawbacks or needs for improvement in the prior art, the present invention provides a quantum noise stream cipher transmitter, receiver, communication system and method, which can improve the cipher rate and security.
To achieve the above object, according to a first aspect of the present invention, there is provided a quantum noise stream cipher transmitter, comprising a mode-locked laser light source, a dispersion device, an arbitrary waveform generator, a phase modulator, a dispersion compensation fiber, and a tunable optical attenuator; the dispersion device is used for widening an optical pulse signal generated by the mode-locked laser light source on a time domain; the arbitrary waveform generator is used for generating multilevel system ciphertext data; the phase modulator is used for performing phase modulation on the broadened optical signals chip by using the multilevel cipher text data; the dispersion compensation optical fiber is used for carrying out dispersion compensation on the encrypted information with dispersion amount of the dispersion device and the like; and the variable optical attenuator is used for attenuating the signal power after dispersion compensation to a mesoscopic level and then sending out the signal power.
Further, the dispersive device is a single mode optical fiber.
Further, the generating the multilevel cipher text data comprises:
the spectrum phase coding adopts binary coding, the chip stream is marked as x, an S-bit shared seed key K distributed by a quantum key is processed by an expansion module to form an expansion key u, and the calculation formula is
ENC(KS)＝u＝(u1,u2,...,un)
Wherein ENC is a spread function, u has a length of l bits and a value range of 0 to 2l-1, encrypting the chip stream x chip by using the extended key u to obtain a multilevel cipher text m, wherein the encryption operation formula is
Where Pol (u) indicates that 0 is taken for even numbers, 1 is taken for odd numbers,
representing an exclusive or.
Further, the optical pulse signal generated by the mode-locked laser light source is marked as U (0,T),
wherein C is an initial chirp parameter, T0Is the half width of the optical pulse, i is the unit of the imaginary number in the complex number,
the time domain expanded signal is marked as U (z, T),
wherein, beta2The group velocity dispersion parameter is, z is the length of the single mode fiber, and T is the time deviation of the optical pulse relative to the pulse peak.
According to a second aspect of the present invention, there is also provided a quantum noise stream cipher receiver comprising a dispersive device, an arbitrary waveform generator, a phase modulator and a dispersion compensating fiber; the dispersion device is used for broadening the time domain of a received signal, which is the same as that of a signal sending end; the arbitrary waveform generator is used for generating a decryption key; the phase modulator is used for decoding the time domain expanded signal by using the decryption key; the dispersion compensation fiber is used for carrying out dispersion compensation on the decrypted information with dispersion quantity of the dispersion device and the like.
Furthermore, the quantum noise stream encryption receiver also comprises an amplifier, a photoelectric detector, a clock data recovery module and a bit error rate test module;
the amplifier is used for carrying out amplification processing before the receiving signal is input into the single-mode optical fiber; the photodetector is used for detecting a decryption signal from the phase modulator output signal; the clock data recovery module is used for recovering a clock signal from an input signal of the clock data recovery module; the bit error rate testing module is used for carrying out data testing on input signals of the bit error rate testing module.
According to a third aspect of the present invention, there is also provided a quantum noise stream cipher communication system comprising a transmitter and a receiver;
the transmitter comprises a mode-locked laser light source, a first dispersion device, a first arbitrary waveform generator, a first phase modulator, a first dispersion compensation optical fiber and an adjustable optical attenuator; the first dispersion device is used for broadening optical pulse signals generated by the mode-locked laser light source in a time domain; the first arbitrary waveform generator is used for generating multilevel ciphertext data; the first phase modulator is used for performing phase modulation on the broadened optical signal chip by using the multilevel cipher text data; the first dispersion compensation optical fiber is used for carrying out dispersion compensation on the encrypted information by the dispersion amount equal to that of the first dispersion device; the variable optical attenuator is used for attenuating the signal power after dispersion compensation to a mesoscopic level and then sending out the signal power;
the receiver comprises a second dispersion device, a second arbitrary waveform generator, a second phase modulator and a second dispersion compensation fiber; the second dispersion device is used for time domain broadening of a received signal, and the dispersion amount of the second dispersion device is the same as that of the first dispersion device; the second arbitrary waveform generator is used for generating a decryption key; the second phase modulator is used for decoding the time domain expanded signal by using the decryption key; the second dispersion compensation fiber is used for carrying out dispersion compensation on the decrypted information by the dispersion quantity equal to that of the second dispersion device.
Further, the first dispersive device and the second dispersive device are both single-mode optical fibers.
According to a fourth aspect of the present invention, there is also provided a quantum noise stream encryption and decryption method, comprising:
the optical pulse signal is broadened on a time domain by using a first dispersion device, the broadened optical signal is subjected to phase modulation chip by using multilevel cipher text data, the encrypted information is subjected to dispersion compensation with dispersion quantity such as the first dispersion device, and the signal power after the dispersion compensation is attenuated to a mesoscopic state level and then is sent out.
Further, the quantum noise stream encryption and decryption method further comprises the following steps:
and carrying out time domain broadening on the received signal by using a second dispersion device, wherein the dispersion amount of the second dispersion device is the same as that of the first dispersion device, decoding the signal after the time domain broadening by using a decryption key, and carrying out dispersion compensation on the decrypted information by using the dispersion amount of the second dispersion device and the like.
In general, compared with the prior art, the above technical solution contemplated by the present invention can achieve the following beneficial effects:
(1) The transmitter comprises a mode-locked laser light source and a single-mode fiber, the mode-locked laser light source and the single-mode fiber are used as a light source module together, the mode-locked laser generates light pulses, the single-mode fiber widens the time domain waveforms of the light pulses, the widened time domain components correspond to the frequency domain components one to one, and the improvement enables the light signals to be continuous in the time domain and facilitates frequency spectrum coding in the time domain.
(2) The transmitter comprises a phase modulator and a dispersion compensation optical fiber which are used as a coding module together, the phase modulator modulates the encrypted coding information to an optical carrier one by one bit in the time domain, and the dispersion compensation optical fiber compresses the coded optical signal in the time domain.
(3) The receiver comprises a single-mode fiber and a phase modulator which are used as a decoding module together, the single-mode fiber expands the time domain waveform of the quantum noise stream encryption coding optical signal, the phase modulator loads decryption and decoding information onto an optical carrier, the improvement forces a non-partner to expand the signal which needs to be matched so as to recover the original information, and the safety performance of the system is improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic diagram of a transmitter, receiver and communication system for chip-by-chip encrypted quantum noise stream encryption in accordance with an embodiment of the present invention;
FIG. 2 is a chip-by-chip encrypted quantum noise stream encrypted communication system signal of an embodiment of the present invention;
fig. 3 is a schematic diagram of the quantum noise random encryption principle of chip-by-chip encryption.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The terms "first," "second," and the like in the description and claims of the present application and in the above-described drawings are used for distinguishing between different objects and not for describing a particular order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or modules is not limited to only those steps or modules recited, but may alternatively include other steps or modules not recited, or that are inherent to such process, method, article, or apparatus.
As shown in fig. 1, a quantum noise stream encryption transmitter according to an embodiment of the present invention includes a mode-locked laser light source, a dispersion device, an arbitrary waveform generator, a phase modulator, a dispersion compensation fiber, and a tunable optical attenuator; the dispersion device is used for widening an optical pulse signal generated by the mode-locked laser light source on a time domain; the arbitrary waveform generator is used for generating multilevel system ciphertext data; the phase modulator is used for performing phase modulation on the broadened optical signals chip by using the multilevel cipher text data; the dispersion compensation optical fiber is used for carrying out dispersion compensation on the encrypted information with dispersion amount of a dispersion device and the like; the variable optical attenuator is used for attenuating the signal power after dispersion compensation to a mesoscopic level and then sending out the signal power.
The mode-locked laser light source and the dispersion device are jointly used as a light source module, the mode-locked laser generates light pulses, the single-mode optical fiber widens the time domain waveform of the light pulses, and the broadened time domain components correspond to the frequency domain components one to one, so that the optical signal is continuous in the time domain, and the frequency spectrum coding is convenient to perform in the time domain. The optical pulse is subjected to time domain broadening through a dispersion device and then sent to a phase modulator for phase modulation.
The pulse optical signal is subjected to time domain broadening by a dispersion device, when three-order and higher-order dispersion does not exist, the components of the optical signal in the time domain correspond to the components in the frequency domain one by one, and the broadened optical signal is subjected to multilevel phase modulation and can be equivalent to frequency spectrum phase coding.
Further, the dispersive device is a single mode optical fiber.
The phase modulator and the dispersion compensation optical fiber are jointly used as a coding module, the phase modulator modulates the encrypted coding information to the optical carrier one by one in the time domain, and the dispersion compensation optical fiber compresses the coded optical signal in the time domain.
The variable optical attenuator attenuates the signal power to a mesoscopic level and then transmits the signal power.
The quantum noise stream encryption receiver comprises a dispersion device, an arbitrary waveform generator, a phase modulator and a dispersion compensation optical fiber; the dispersion device is used for broadening the time domain of a received signal, which is the same as that of a signal sending end, and particularly ensures that the dispersion quantity of the dispersion device in the receiver is equal to that of the dispersion device in the transmitter; the arbitrary waveform generator is used for generating a decryption key; the phase modulator is used for decoding the signals with the expanded time domain by using the decryption key; the dispersion compensation fiber is used for performing dispersion compensation of the decrypted information with the dispersion amount of a dispersion device in the receiver.
Further, the dispersive device is a single mode optical fiber.
Furthermore, the receiver also comprises an amplifier, a photoelectric detector, a clock data recovery module and a bit error rate test module;
the amplifier is used for carrying out amplification processing before a received signal is input into the single-mode optical fiber; the photoelectric detector is used for detecting a decryption signal from the output signal of the phase modulator; the clock data recovery module is used for recovering a clock signal from an input signal of the clock data recovery module; the bit error rate testing module is used for carrying out data testing on the input signal.
And the legal receiver decrypts by using the decryption key according to the mapping rule to obtain a plaintext code word, and then decodes the plaintext code word to obtain the original data.
The quantum noise stream encryption communication system for chip-by-chip encryption comprises a transmitter and a receiver, wherein the transmitter is used for transmitting a quantum noise stream to the receiver; the transmitter comprises a mode-locked laser light source, a first dispersion device, a first arbitrary waveform generator, a first phase modulator, a first dispersion compensation optical fiber and an adjustable optical attenuator; the first dispersion device is used for broadening an optical pulse signal generated by the mode-locked laser light source on a time domain; the first arbitrary waveform generator is used for generating multilevel system ciphertext data; the first phase modulator is used for performing phase modulation on the broadened optical signal chip by using the multilevel cipher text data; the first dispersion compensation fiber is used for carrying out dispersion compensation on the encrypted information by the dispersion amount equal to that of the first dispersion device; the variable optical attenuator is used for attenuating the signal power after dispersion compensation to a mesoscopic level and then sending out the signal power; the receiver comprises a second dispersion device, a second arbitrary waveform generator, a second phase modulator and a second dispersion compensation fiber; the second dispersion device is used for widening the time domain of the received signal, and the dispersion amount of the second dispersion device is the same as that of the first dispersion device; the second arbitrary waveform generator is used for generating a decryption key; the second phase modulator is used for decoding the signal with the expanded time domain by using a decryption key; the second dispersion compensating fiber is used for dispersion compensation of the amount of dispersion of the decrypted information by the second dispersion device.
In one embodiment, at a transmitting end, a mode-locked laser light source generates optical pulses with a repetition frequency of 2.5GHz and a full width at half maximum of 4ps, and the optical pulses are subjected to time domain broadening through a single mode fiber and then sent to a phase modulator for phase modulation. The arbitrary waveform generator generates multilevel cipher text data m, the modulation chip rate is 80Gchip/s, the chip length is 32 bits, the spreading pulse is subjected to chip rate level phase modulation in the time domain, which is equivalent to phase coding quantum noise random encryption in the frequency domain, and the coded waveform is shown as fig. 2 (a). After the encrypted information passes through the dispersion compensation optical fiber with equal dispersion amount, the signal power is attenuated to a mesoscopic state level by using the variable optical attenuator, and the attenuated signal is sent to the optical transmission link.
At a receiving end, a transmitted signal enters a receiver of a quantum noise random encryption system, and is firstly sent into a low-noise optical amplifier, then sent into a single-mode optical fiber for time domain broadening, and then sent into a phase modulator for decryption and decoding processing, a decoding signal is shown in fig. 2 (b), a decryption key is generated at an arbitrary waveform generator at the receiving end after being distributed by a key distribution system, the decryption signal is sent into a dispersion compensation optical fiber and then is detected by a photoelectric detector, and then a clock data recovery module and a bit error rate test system are carried out for data test.
As shown in fig. 3, the time domain waveform of the pulsed light signal is as shown in fig. 3 (a), the waveform after the time domain broadening by the dispersive device is as shown in fig. 3 (c), the shared seed key distributed by the quantum key is expanded to form the expanded key as shown in fig. 3 (b), the photon in the mesoscopic state is masked by the quantum noise as shown in fig. 3 (d), wherein the total state base is MbThen, the broadened optical signal is encrypted chip by using the spreading key pair to form a ciphertext as shown in fig. 3 (e).
The quantum noise stream encryption and decryption method based on chip-by-chip encryption comprises the following steps:
(1) The optical pulse signal is broadened in the time domain by using a dispersion device.
The time domain broadening is realized by using group velocity dispersion effect during optical pulse transmission, assuming that the optical pulse generated by the input mode-locked laser light source is a linear chirp Gaussian pulse, and is marked as U (0,T), and the expression is U (0,T)
Wherein C is an initial chirp parameter, T0Is the optical pulse half-width, i is the imaginary unit in the complex number. z is the length of the single mode fiber, the transmission distance of the single mode fiberThe signal after z is denoted as U (z, T), and its expression is
Wherein, beta2T is the time deviation of the optical pulse from the pulse peak, which is the group velocity dispersion parameter.
Pulse width T at this time1And initial pulse width T0The relationship of (1) is:
i.e. broaden T1/T0And (4) multiplying.
(2) And performing phase modulation on the broadened optical signals chip by using the multi-system ciphertext data, performing dispersion compensation on the encrypted information with dispersion quantity of a dispersion device at a sending end, and the like, and attenuating the signal power after the dispersion compensation to a mesoscopic state level and then sending out the signal power.
The principle of generating the multilevel ciphertext data by the arbitrary waveform generator is as follows: and expanding the shared seed key distributed by the quantum key to form an expanded key, and encrypting the expanded optical signals chip by using the expanded key to form a ciphertext.
The spectrum phase coding adopts binary coding, the chip stream is marked as x, an S-bit shared seed key K distributed by a quantum key is processed by an expansion module to form an expansion key u, and the calculation formula is
ENC(KS)＝u＝(u1,u2,...,un)
Wherein ENC is a spreading function, wherein u has a length of l bits and a value in the range of 0 to 2l-1, encrypting the chip stream x chip by using the extended key u to obtain a multilevel cipher text m, wherein the encryption operation formula is
WhereinPol (u) indicates that 0 is taken for even numbers, 1 is taken for odd numbers,
indicating an exclusive or.
In the phase-coded modulation process, the quantum state of the phase loaded to the mesoscopic state is
|Ψ(m)>＝|αexp(imπ/Mb)>
Where α is the amplitude of the coherent state of the spectral components of the different time-domain columns, MbThe basic state number, m is the multilevel cipher text obtained by chip-by-chip encryption operation.
The signal power is attenuated to a mesoscopic state level by the optical attenuator and then transmitted, and at the moment, quantum noise can at least cover two adjacent phase states. Wherein, mesoscopic refers to the range between the macroscopic world and the microscopic world, when the power level of the optical signal is reduced to that the quantum noise is large enough to cover several quantum states, the average number of photons is generally in the order of 102-104 per bit, and the optical signal at this power level is said to be in the mesoscopic state.
The encoded single bit signal can be represented as
Wherein m is1,m2,...,mRchipTake 0-2M according to the secret keybAn integer of-1, α1,α2,...,αRchipAre the coherent state amplitudes of the different equivalent spectral components.
(3) And performing time domain broadening on the received signal, which is the same as that of the signal sending end, decoding the signal subjected to the time domain broadening by using a decryption key, and performing dispersion compensation on the decrypted information with dispersion quantities of a receiving end dispersion device and the like.
The decoded bit-1 signal can be represented as
Thus, after the decoded signal is compressed in the time domain through the dispersion compensation fiber, bit 1 recovers the original optical pulse. The decoded bit 0 signal can be represented as
Wherein d is1,d2,...,dRchipFetch 0-2M according to decryption keyb-an integer of 1. Thus, after the time-domain compression of the decoded signal by the dispersion compensation fiber, bit 0 is a signal that is continuous in the time domain, similar to the encoded signal.
The working principle of each device in the transmitter, the receiver and the communication system is the same as that in the method, and the description is omitted.
The above description is only an exemplary embodiment of the present disclosure, and the scope of the present disclosure should not be limited thereby. It is intended that all equivalent variations and modifications made in accordance with the teachings of the present disclosure be covered thereby. Embodiments of the present disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
The technical features of the above embodiments can be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the above embodiments are not described, but should be considered as the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
It will be understood by those skilled in the art that the foregoing is only a preferred embodiment of the present invention, and is not intended to limit the invention, and that any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A quantum noise stream encryption transmitter is characterized by comprising a mode-locked laser light source, a dispersion device, an arbitrary waveform generator, a phase modulator, a dispersion compensation optical fiber and a variable optical attenuator; the dispersion device is used for widening an optical pulse signal generated by the mode-locked laser light source on a time domain; the arbitrary waveform generator is used for generating multilevel system ciphertext data; the phase modulator is used for performing phase modulation on the broadened optical signals chip by using the multilevel cipher text data; the dispersion compensation optical fiber is used for carrying out dispersion compensation on the encrypted information with dispersion amount of the dispersion device and the like; and the variable optical attenuator is used for attenuating the signal power after dispersion compensation to a mesoscopic level and then sending out the signal power.
2. The quantum noise stream cipher transmitter of claim 1, wherein the dispersive device is a single mode optical fiber.
3. The quantum noise stream cipher transmitter of claim 1, wherein the generating the multilevel cipher text data comprises:
the spectrum phase coding adopts binary coding, the chip flow is marked as x, the S-bit shared seed key K distributed by the quantum key is processed by the expansion module to form an expansion key u, and the calculation formula is
ENC(KS)＝u＝(u1,u2,...,un)
Wherein ENC is a spreading function, u has a length of l bits and a value range of 0 to 2l-1, encrypting the chip stream x chip by using the extended key u to obtain a multilevel cipher text m, wherein the encryption operation formula is
Where Pol (u) indicates 0 for even numbers, 1 for odd numbers, and ∈ indicates exclusive or.
4. The quantum noise stream encryption transmitter of claim 2, wherein an optical pulse signal generated by the mode locked laser light source is denoted as U (0,T),
wherein C is an initial chirp parameter, T0Is the half width of the optical pulse, i is the unit of the imaginary number in the complex number,
the time domain expanded signal is denoted as U (0,T),
wherein, beta2The group velocity dispersion parameter is, z is the length of the single mode fiber, and T is the time deviation of the optical pulse relative to the pulse peak.
5. A quantum noise stream encryption receiver is characterized by comprising a dispersion device, an arbitrary waveform generator, a phase modulator and a dispersion compensation optical fiber; the dispersion device is used for broadening the time domain of a received signal, which is the same as that of a signal sending end; the arbitrary waveform generator is used for generating a decryption key; the phase modulator is used for decoding the time domain expanded signal by using the decryption key; the dispersion compensation fiber is used for carrying out dispersion compensation on the decrypted information with dispersion quantities of the dispersion device and the like.
6. The quantum noise stream cipher receiver of claim 5, further comprising an amplifier, a photodetector, a clock data recovery module, and a bit error rate test module;
the amplifier is used for carrying out amplification processing before the receiving signal is input into the single-mode optical fiber; the photodetector is used for detecting a decryption signal from the phase modulator output signal; the clock data recovery module is used for recovering a clock signal from an input signal of the clock data recovery module; the bit error rate testing module is used for carrying out data testing on input signals of the bit error rate testing module.
7. A quantum noise stream encryption communication system, comprising a transmitter and a receiver;
the transmitter comprises a mode-locked laser light source, a first dispersion device, a first arbitrary waveform generator, a first phase modulator, a first dispersion compensation fiber and a variable optical attenuator; the first dispersion device is used for broadening an optical pulse signal generated by the mode-locked laser light source in a time domain; the first arbitrary waveform generator is used for generating multilevel ciphertext data; the first phase modulator is used for performing phase modulation on the broadened optical signals chip by using the multilevel cipher text data; the first dispersion compensation fiber is used for carrying out dispersion compensation on the encrypted information by the dispersion quantity equal to that of the first dispersion device; the variable optical attenuator is used for attenuating the signal power after dispersion compensation to a mesoscopic state level and then sending out the signal power;
the receiver comprises a second dispersion device, a second arbitrary waveform generator, a second phase modulator and a second dispersion compensation fiber; the second dispersion device is used for widening a received signal in a time domain, and the dispersion amount of the second dispersion device is the same as that of the first dispersion device; the second arbitrary waveform generator is used for generating a decryption key; the second phase modulator is used for decoding the signal after the time domain broadening by using the decryption key; the second dispersion compensation fiber is used for carrying out dispersion compensation on the decrypted information by the dispersion quantity equal to that of the second dispersion device.
8. A quantum noise flow encryption communication system according to claim 7, wherein the first dispersive device and the second dispersive device are each single mode optical fibers.
9. A method for quantum noise stream encryption and decryption, comprising:
the optical pulse signal is broadened on a time domain by using a first dispersion device, the broadened optical signal is subjected to phase modulation chip by using multilevel cipher text data, the encrypted information is subjected to dispersion compensation with dispersion quantity such as the first dispersion device, and the signal power after the dispersion compensation is attenuated to a mesoscopic state level and then is sent out.
10. The quantum noise stream encryption and decryption method of claim 9, further comprising:
and carrying out time domain broadening on the received signal by using a second dispersion device, wherein the dispersion amount of the second dispersion device is the same as that of the first dispersion device, decoding the signal after the time domain broadening by using a decryption key, and carrying out dispersion compensation on the decrypted information by using the dispersion amount of the second dispersion device and the like.
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