CN108599870B - Encryption and decryption communication device based on time domain Talbot effect and secret communication system - Google Patents
Encryption and decryption communication device based on time domain Talbot effect and secret communication system Download PDFInfo
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- CN108599870B CN108599870B CN201810829421.3A CN201810829421A CN108599870B CN 108599870 B CN108599870 B CN 108599870B CN 201810829421 A CN201810829421 A CN 201810829421A CN 108599870 B CN108599870 B CN 108599870B
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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
- H04B10/80—Optical aspects relating to the use of optical transmission for specific applications, not provided for in groups H04B10/03 - H04B10/70, e.g. optical power feeding or optical transmission through water
- H04B10/85—Protection from unauthorised access, e.g. eavesdrop protection
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Abstract
The invention discloses an encryption and decryption communication device and a secret communication system based on a time domain Talbot effect, and belongs to the technical field of optical communication. The encryption communication apparatus includes: the system comprises a driving mode-locked laser, an intensity modulator and a positive dispersion device; the decryption communication apparatus includes: negative dispersion device, light detector. The invention uses dispersion medium with any dispersion to change the light signal pulse into disordered signal without information, and uses inverse dispersion demodulation to obtain original signal at output end, to realize secret communication effect, with simple technical scheme and low cost.
Description
Technical Field
The invention relates to the field of optical communication, in particular to an encryption and decryption communication device and a secret communication system based on a time domain Talbot effect.
Background
With the advent of the big data age, all signals that did not pass encryption were no different from "nude" on the link. In the modern society, people's attention to security of communication is gradually increasing.
The secret communication technology is a communication mode which changes the expression form of information according to an appointed method to conceal the real content of the information in order to prevent signals from being stolen between an information source and an information sink, and has important application in aspects of national defense, commerce, finance, military, science and technology and the like. Until now, many secure communication technologies have been proposed, including quantum secure technology, RSA method, and secure communication technology using special encoding. However, these prior art solutions are complex and costly. Therefore, there is a need for a secure communication system that is simple in scheme, low in cost, and ensures a good secure communication effect.
Disclosure of Invention
Technical problem to be solved
In view of the above, the present invention provides an encryption/decryption communication apparatus and a secure communication system based on the time domain talbot effect, so as to solve the problems of complex technical scheme and high cost in the prior art.
(II) technical scheme
According to an aspect of the present invention, there is provided an encryption communication apparatus based on the time domain talbot effect, including:
the active mode-locked laser is used for outputting optical pulses with constant phases, and the optical spectrum is comb-shaped;
the intensity modulator is connected with the active mode-locked laser, the microwave signal period of the intensity modulator is matched with the optical pulse repetition frequency, and the intensity modulator is used for modulating the optical pulse to a signal with the repetition frequency;
and a positive dispersion device connected with the intensity modulator and used for introducing positive dispersion to the signal.
In a further embodiment, the repetition frequency of said light pulses is in the range of 1 to 43 GHz.
In a further embodiment, the pulse width of the light pulse is from 4 to 50 ps.
In a further embodiment, the positive dispersion value is greater than or equal to 50ps/nm
According to still another aspect of the present invention, there is provided a decryption communication apparatus based on the time domain talbot effect, including:
a negative dispersion device for introducing negative dispersion to the signal into which the positive dispersion has been introduced, the negative dispersion being capable of compensating for the positive dispersion;
and the optical detector is connected with the negative dispersion device and is used for detecting the waveform of the signal light.
According to still another aspect of the present invention, there is provided a secure communication system based on the time domain talbot effect, comprising:
the active mode-locked laser is used for outputting optical pulses with constant phases, and the optical spectrum is comb-shaped;
the intensity modulator is connected with the active mode-locked laser, the microwave signal period of the intensity modulator is matched with the optical pulse repetition frequency, and the intensity modulator is used for modulating the optical pulse to a signal with the repetition frequency;
a positive dispersion device connected to the intensity modulator for introducing positive dispersion to the signal;
the negative dispersion device is connected with the positive dispersion device and used for introducing negative dispersion to the signal, and the negative dispersion can compensate the positive dispersion introduced by the positive dispersion device;
and the optical detector is connected with the negative dispersion device and is used for detecting the waveform of the signal light.
In a further embodiment, the secure communication system based on the time domain talbot effect further includes: and the single-mode optical fiber is positioned between the positive dispersion device and the negative dispersion device and is used for introducing positive dispersion again.
(III) advantageous effects
The encryption and decryption communication device and the secret communication system based on the time domain Talbot effect can utilize a dispersion medium with any dispersion to change optical signal pulses into disordered signals without carrying information, can obtain original signals by utilizing negative dispersion demodulation at an output end, achieves the effect of secret communication, and has the advantages of simple technical scheme and low cost. In addition, the dispersion value is arbitrary, so the loss of the dispersion device can be small, and the feasibility is high.
Drawings
FIG. 1 is a block diagram of the system of the present invention.
Fig. 2 is a diagram of optical pulses emitted by an active mode-locked laser in an embodiment of the present invention.
Fig. 3 is a diagram of an optical signal modulated by an intensity modulator in an embodiment of the present invention.
Fig. 4 is a signal diagram after passing through a transmitting end positive dispersion device in an embodiment of the present invention.
Fig. 5 is a signal diagram after passing through a conventional single mode optical fiber according to an embodiment of the present invention.
Fig. 6 is a signal diagram obtained after dispersion compensation at the receiving end in the embodiment of the present invention.
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 specific embodiments and the accompanying drawings.
The spatial talbot effect can be expressed as a phenomenon that a coherent light beam reflected or projected from a periodic object periodically recurs at a certain distance under appropriate conditions. The object may be one-dimensional periodic or two-dimensional periodic (e.g., a spatial grating). These reconstructed images are called talbot images. In addition to these fully reproduced patterns, more interesting patterns were observed. For example, at other positions in the propagation direction, the periodic pattern may recur with a period different from the period of the original object. These phenomena are known as fractional order talbot effects. Based on the space-time duality, the scholars introduce the space-domain talbot effect to the time domain, and the talbot effect shows that the self-imaging effect is generated when a periodic time-domain signal (such as a short light pulse wave train) passes through a dispersion medium meeting a first-order dispersion condition in the time domain (the time-domain talbot effect or the self-imaging effect). At certain specific dispersion locations, the period and amplitude of the periodic time domain signal are reduced by a factor of two. Therefore, the Talbot effect has better security effect when applied to the communication system.
The invention provides an encryption communication device based on time domain Talbot effect, comprising:
and the active mode-locked laser 1 is used for outputting optical pulses with constant phases, and the optical spectrum is comb-shaped. Because the condition of the spatial domain Talbot effect is that plane waves are incident on the grating, a light field close to the grating can periodically reappear after being transmitted through a free space, and a corresponding periodic constant-phase light pulse can periodically reappear after passing through a section of dispersion medium in a time domain, the phases of the required light pulses must be the same, the light pulses cannot be disordered, and the spectrum needs to be comb-shaped. Otherwise, after propagation through a dispersive medium, only a broadening of the pulses is obtained, without redistributing the energy of the signal. The repetition frequency of the optical pulses may be 1-43 GHz; the pulse width of the optical pulses may be 4-50 ps.
And the intensity modulator 2 is connected with the active mode-locked laser 1, the microwave signal period of the intensity modulator is matched with the optical pulse repetition frequency, and the intensity modulator is used for modulating the signal with the repetition frequency. The pulse train carries information after the optical pulses output from the active mode-locked laser 1 are modulated by the intensity modulator 2.
And a positive dispersion device 3 connected to the intensity modulator 2 for introducing positive dispersion to the signal. After the signal after intensity modulation is transmitted through a distance of any dispersion distance, the energy of the signal light pulse can be redistributed to form an irregular light signal, and the signal to be transmitted is disguised so as to achieve the encryption effect. The encryption effect can be realized when the positive dispersion value introduced by the positive dispersion device 3 is more than or equal to 50 ps/nms.
The invention provides a decryption communication device based on time domain Talbot effect, comprising:
a negative dispersion device 5 for introducing negative dispersion to the signal into which the positive dispersion has been introduced, the negative dispersion being capable of compensating for the positive dispersion of the signal to be decrypted.
And the optical detector 7 is connected with the negative dispersion device 5 and is used for detecting the waveform of the signal light.
The invention provides a secret communication system based on time domain Talbot effect, as shown in figure 1, comprising a sending end 8 and a receiving end 9, wherein the sending end 8 comprises:
and the active mode-locked laser 1 is used for outputting optical pulses with constant phases, and the optical spectrum is comb-shaped.
And the intensity modulator 2 is connected with the active mode-locked laser 1 and is used for modulating the signal with the repetition frequency.
And a positive dispersion device 3 connected to the intensity modulator 2 for introducing positive dispersion to the signal.
The receiving end 9 includes:
and the negative dispersion device 5 is connected with the positive dispersion device 3 and is used for introducing compensation dispersion to the signal, and the compensation dispersion is matched with the positive dispersion introduced by the positive dispersion device 3.
And the optical detector 7 is connected with the negative dispersion device 5 and is used for detecting the waveform of the signal light.
In the present invention, when the receiving end 9 needs to demodulate the signal, the original signal can be recovered by using the inverse talbot effect as long as the dispersion of the transmitting end 8 and the dispersion in the transmission process are both compensated. In addition, because of the Talbot effect, the redistribution of the signal energy can be realized only by small dispersion which is more than or equal to 50 ps/nms; since the dispersion value can be small, the losses introduced are also low.
Preferably, the secure communication system based on the time domain talbot effect further includes: and the single-mode optical fiber 4 is positioned between the positive dispersion device 3 and the negative dispersion device 5 and is used for introducing positive dispersion again. When the secure communication system based on the time domain talbot effect includes the single mode fiber 4, the negative dispersion device 5 introduces the compensated dispersion which is the sum of the positive dispersion device 3 and the positive dispersion introduced by the single mode fiber 4.
In one embodiment of the present invention, active mode-locked laser 1 emits optical pulses as shown in FIG. 2; fig. 3 shows an optical signal obtained by modulating an optical pulse with an intensity modulator 2 to a signal having a repetition frequency of 9.7GHz (11010011010100100110); the positive dispersion device 3 introduces positive dispersion to the optical signal, and the waveform obtained after passing through a dispersion medium of 169.15ps/nm is as shown in fig. 4, thereby realizing the encryption of the signal; fig. 5 shows signals obtained by propagation through the 20km single-mode fiber 4, the single-mode fiber used in this embodiment is a normal single-mode fiber, and the dispersion coefficient of the normal single-mode fiber is approximately 17ps/nm/km, so that the introduced dispersion is 340ps/nm, and the signals at the output end can be seen to be more disordered, and the information of the original signals can not be seen completely; the waveform obtained after the dispersion compensation is performed by the negative dispersion device 5, that is, the compensation of- (340+169.15) ps/nm is as shown in fig. 6, the signal in fig. 1 is completely recovered, and the decryption of the signal is realized.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are only exemplary embodiments of the present invention, and are not intended to limit the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. An encrypted communication device based on the time domain Talbot effect, comprising:
the active mode-locked laser (1) is used for outputting optical pulses with constant phases, and the optical spectrum is comb-shaped;
the intensity modulator (2) is connected with the active mode-locked laser (1), the microwave signal period of the intensity modulator is matched with the optical pulse repetition frequency, and the intensity modulator is used for modulating the optical pulse to a signal with the repetition frequency;
and the positive dispersion device (3) is connected with the intensity modulator (2) and is used for introducing positive dispersion to the signal output by the intensity modulator (2).
2. The time-domain Talbot effect-based encrypted communication device of claim 1, wherein a repetition frequency of the optical pulses is 1-43 GHz.
3. The time-domain Talbot effect-based encrypted communication device of claim 1, wherein the pulse width of the optical pulse is 4-50 ps.
4. The time-domain Talbot effect-based encrypted communication device of claim 1, wherein the positive dispersion value is ≧ 50 ps/nm.
5. A decryption communication apparatus based on the encryption communication apparatus based on the time domain Talbot effect of any claim 1 ~ 4, comprising:
a negative dispersion device (5) for introducing negative dispersion to the signal into which positive dispersion has been introduced, the negative dispersion being capable of compensating for positive dispersion;
and the optical detector (7) is connected with the negative dispersion device (5) and is used for detecting the waveform of the signal light.
6. A secure communication system based on the time domain talbot effect, comprising:
the active mode-locked laser (1) is used for outputting optical pulses with constant phases, and the optical spectrum is comb-shaped;
the intensity modulator (2) is connected with the active mode-locked laser (1), the microwave signal period of the intensity modulator is matched with the optical pulse repetition frequency, and the intensity modulator is used for modulating the optical pulse to a signal with the repetition frequency;
a positive dispersion device (3) connected to the intensity modulator (2) for introducing positive dispersion to the signal output by the intensity modulator (2);
a negative dispersion device (5) connected to the positive dispersion device (3) for introducing negative dispersion to the signal into which the positive dispersion has been introduced, the negative dispersion being capable of compensating for the positive dispersion introduced by the positive dispersion device (3);
and the optical detector (7) is connected with the negative dispersion device (5) and is used for detecting the waveform of the signal light.
7. The secure time-domain Talbot effect based communication system as recited in claim 6, further comprising: the single mode fiber (4) is positioned between the positive dispersion device (3) and the negative dispersion device (5) and is used for introducing positive dispersion again, and the negative dispersion device (5) further comprises a compensation unit for compensating the positive dispersion introduced by the single mode fiber (4).
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| US11240018B2 (en) | 2019-10-30 | 2022-02-01 | Eagle Technology, Llc | Quantum communications system having quantum key distribution and using a talbot effect image position and associated methods |
| US11082216B2 (en) | 2019-10-30 | 2021-08-03 | Eagle Technology, Llc | Quantum communication system having quantum key distribution and using a midpoint of the talbot effect image position and associated methods |
| US11050559B2 (en) | 2019-11-19 | 2021-06-29 | Eagle Technology, Llc | Quantum communications system using Talbot effect image position and associated methods |
| CN111274533B (en) * | 2020-02-24 | 2023-04-07 | 杭州电子科技大学 | Light domain cross-correlation operation method and device based on Talbot effect |
| CN111769875A (en) * | 2020-06-05 | 2020-10-13 | 杭州电子科技大学 | Arbitrary waveform generating device and method based on integer-order time domain Talbot effect |
| CN111987577B (en) * | 2020-06-05 | 2021-09-10 | 南京大学 | All-fiber laser with flexibly multiplied repetition frequency |
| CN115102649B (en) * | 2022-06-20 | 2024-09-20 | 杭州电子科技大学 | High-precision real-time spectrum sensing method and system based on reverse time domain Talbot effect |
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