CN109451281B - Video monitoring system - Google Patents
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- CN109451281B CN109451281B CN201811565510.8A CN201811565510A CN109451281B CN 109451281 B CN109451281 B CN 109451281B CN 201811565510 A CN201811565510 A CN 201811565510A CN 109451281 B CN109451281 B CN 109451281B
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 54
- 230000000739 chaotic effect Effects 0.000 claims abstract description 65
- 230000004044 response Effects 0.000 claims abstract description 42
- 239000013307 optical fiber Substances 0.000 claims abstract description 23
- 230000003287 optical effect Effects 0.000 claims abstract description 22
- 230000005540 biological transmission Effects 0.000 claims abstract description 17
- 238000004891 communication Methods 0.000 claims abstract description 13
- 239000000835 fiber Substances 0.000 claims description 43
- 230000010287 polarization Effects 0.000 claims description 36
- 238000006243 chemical reaction Methods 0.000 claims description 7
- 230000009977 dual effect Effects 0.000 claims description 7
- 230000010355 oscillation Effects 0.000 claims description 7
- 230000001629 suppression Effects 0.000 claims description 6
- 229910052691 Erbium Inorganic materials 0.000 claims description 2
- UYAHIZSMUZPPFV-UHFFFAOYSA-N erbium Chemical compound [Er] UYAHIZSMUZPPFV-UHFFFAOYSA-N 0.000 claims description 2
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 238000005516 engineering process Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 239000004065 semiconductor Substances 0.000 description 4
- 230000006855 networking Effects 0.000 description 2
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- 239000000969 carrier Substances 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/18—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast
- H04N7/181—Closed-circuit television [CCTV] systems, i.e. systems in which the video signal is not broadcast for receiving images from a plurality of remote sources
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N7/00—Television systems
- H04N7/22—Adaptations for optical transmission
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Abstract
The invention discloses a high-security video monitoring system, which comprises: the anti-theft video signal communication units and the monitoring terminal module are arranged; wherein each anti-theft video signal communication unit comprises: the device comprises a video signal acquisition encryption module and a video signal decoding module; after light emitted by the driving laser passes through the double-light feedback loop, the optical isolator, the optical fiber amplifier and the optical fiber coupler FC2, one path of light enters the video signal acquisition and encryption module, and the other path of light enters the balance detector through the second response laser; the optical signal is input to the first response laser of the video signal acquisition encryption module through the video signal decoding module, and is loaded together with the video signal acquired by the network camera through the first delay line so as to be encrypted and transmitted to the balance detector of the video signal decoding module. The system loads the collected video information to the chaotic signal for transmission, and ensures the safety of video information transmission through two paths of synchronous chaotic information.
Description
Technical Field
The invention relates to a video monitoring system, in particular to a high-confidentiality video monitoring system.
Background
Video monitoring is taken as an important component of a safety precaution system, and with the rapid development of modern computers, networks, image processing and transmission technologies, the video monitoring is developed to the network video monitoring of today after analog monitoring and digital monitoring. The video monitoring system realizes the integration and linkage of video monitoring and a conference, and can flexibly and effectively manage the remote equipment. The video monitoring has the characteristics of intuition, accuracy, timeliness, rich information content and the like, and can achieve the dual functions of monitoring and communication through the applications of video recording, playback, linkage alarm, monitoring strategy formulation, emergency command and the like of a remote monitoring object, so that the requirements of remote monitoring and emergency command in various fields of traffic, water conservancy, oil fields, banks, telecommunication and the like are comprehensively met.
At present, video monitoring technology is developing towards several aspects of networking, high-definition and popularization, and people pay attention to the main point of how to effectively monitor targets. However, there is relatively little concern regarding the security of the monitored information. Information security technology plays a crucial role in key fields related to politics, military, economy and national security. In the aspect of video monitoring, once the video monitoring data applied to the relevant core field is leaked, irreparable loss is caused to the country. Based on this, it is important to add an effective information security technology to the video monitoring technology.
Disclosure of Invention
The invention aims to provide a high-confidentiality video monitoring system, which solves the problem that monitoring information is easy to leak in the transmission process in the existing video monitoring technology, and can load the information acquired by the monitoring system onto chaotic carriers generated by a confidential communication system for transmission, thereby effectively ensuring the security of video information transmission.
In order to achieve the above object, the present invention provides a high security video surveillance system, comprising: the anti-theft video signal communication units and the monitoring terminal module are arranged; wherein each anti-theft video signal communication unit comprises: the device comprises a video signal acquisition encryption module and a video signal decoding module.
In the video signal decoding module, after light emitted by a driving laser passes through a dual-light feedback loop, an optical isolator, an optical fiber amplifier and an optical fiber coupler FC2, one path of light enters the video signal acquisition encryption module, the other path of light enters a balanced detector through a second response laser, the second response laser is injected into a chaotic signal which is output through the dual-light feedback loop and has time delay characteristic suppression, and a broadband chaotic signal I with further suppressed time delay characteristic is obtained and is used for decrypting an encrypted video signal; wherein the dual optical feedback loop has: the delay difference of the two external cavity feedback loops is equal to half of relaxation oscillation time of the driving laser, and chaotic signals with suppressed delay characteristics are output through the double-optical feedback loop.
In the video signal acquisition encryption module, an optical signal is input to a first response laser of the video signal acquisition encryption module through the video signal decoding module, and is loaded with a video signal acquired by a network camera through a first delay line so as to be encrypted and transmitted to a balance detector of the video signal decoding module; the first response laser is injected into a chaotic signal with time delay characteristic suppression output by a double-optical feedback loop to obtain a broadband chaotic signal II with further suppressed time delay characteristic, and the broadband chaotic signal II is used for encrypting a video signal.
The second response laser and the first response laser respectively generate a broadband chaotic signal I and a broadband chaotic signal II which can realize chaotic synchronization and have suppressed time delay characteristics, and the balance detector can output a decoded video signal and transmit the signal to the monitoring terminal module by adjusting the time delay, the power and the polarization state of the two signals.
Preferably, the dual optical feedback loop comprises: circulator, fiber coupler FC4, fiber coupler FC3, second delay line, polarization controller PC1, adjustable attenuator VA1, polarization controller PC2, adjustable attenuator VA2, and fiber coupler FC 5.
After light emitted by the driving laser passes through the circulator, the optical fiber coupler FC4 and the optical fiber coupler FC3, one part of the light is transmitted to the optical fiber coupler FC5 through the second delay line, the polarization controller PC1 and the adjustable attenuator VA1, and the light is fed back to the driving laser through the circulator to form a first external cavity feedback loop; the other part is transmitted to the fiber coupler FC5 through the polarization controller PC2 and the adjustable attenuator VA2, and is fed back to the driving laser through the circulator to form a second outer cavity feedback loop.
Preferably, the splitting ratio of the optical fiber coupler FC4 is 2:8, and the splitting ratios of the optical fiber coupler FC2, the optical fiber coupler FC5 and the optical fiber coupler FC3 are all 5: 5; after passing through the fiber coupler FC4, 80% of the light was transmitted to the fiber coupler FC 3.
Preferably, in the video signal decoding module, the chaotic signal with suppressed delay characteristic, which is obtained by feeding back the driving laser through the circulator, passes through the optical isolator, the optical fiber amplifier and the optical fiber coupler FC2, and a part of the chaotic signal enters the polarization controller PC3 and the adjustable attenuator VA3 and is transmitted to the first response laser; the other part is transmitted to the second responding laser via the polarization controller PC4, the adjustable attenuator VA 4.
Preferably, the broadband chaotic signal with suppressed time delay characteristics generated by the second response laser is transmitted to the balanced detector via an adjustable attenuator VA5 and a polarization controller PC5 in the video signal decoding module; the broadband chaotic signal II with the suppressed time delay characteristic generated by the first response laser is transmitted to the balanced detector through the fiber coupler FC1, the adjustable attenuator VA6 in the video signal decoding module and the polarization controller PC 6.
Preferably, the first responsive laser is electrically connected to a first laser controller; the second response laser is electrically connected with the second laser controller; the driving laser is electrically connected with the third laser controller.
Preferably, the fiber amplifier is an erbium-doped fiber amplifier.
Preferably, the operating wavelengths of the driving laser, the first response laser and the second response laser are all 1550 nm.
Preferably, the monitor terminal module can adjust the angle and the focal length of each network camera according to actual conditions.
Preferably, the balance detector transmits the decoded video signal to the monitoring terminal module through the data conversion module and the router; the data conversion module converts the decoded video signal into a video signal conforming to RJ45 transmission.
The high-security video monitoring system solves the problem that monitoring information is easy to leak in the transmission process in the existing video monitoring technology, and has the following advantages:
(1) the monitoring system can load the video information collected by the network camera onto the chaotic carrier generated by the secret communication system for transmission, one responding laser device obtains the chaotic carrier signal with further suppressed time delay characteristic by the aid of a chaos synchronization technology of one driving two, encryption of the video information is realized by the aid of the chaotic carrier signal, the other responding laser device obtains the chaotic carrier signal with further suppressed time delay characteristic, high-quality synchronization of two paths of chaotic signals can be realized by adjusting time delay, power and polarization states of the two paths of chaotic signals of a video signal decoding module and a video signal collecting encryption module, and the decoded video signal can be output by a balance detector, so that the safety of video information transmission is effectively guaranteed;
(2) the monitoring system of the invention introduces two paths of optical feedback (external cavity feedback) on the semiconductor laser, and ensures that the time delay of the two external cavities and the reciprocal of the relaxation oscillation frequency of the driving laser meet a certain relation by controlling the cavity length and the feedback intensity of the two external cavities, so that the time delay characteristic output by the laser can be effectively inhibited;
(3) according to the monitoring system, the chaotic signals with suppressed delay characteristics obtained by the double-external-cavity feedback laser are injected into the two response DFB lasers with matched parameters, the two response lasers can obtain the chaotic signals with further suppressed delay characteristics and enhanced bandwidth, and the two chaotic signals can realize high-quality chaotic synchronization;
(4) the monitoring system of the invention has the working wavelengths of the driving laser, the first response laser and the second response laser all being 1550nm, can be compatible with the existing optical fiber system, and is beneficial to the popularization and application of the confidential video monitoring technology.
Drawings
Fig. 1 is a schematic structural diagram of a high-security video surveillance system of the present invention.
Fig. 2 is a specific transmission diagram of the high-security video surveillance system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
A high security video surveillance system, as shown in fig. 1, which is a schematic structural diagram of the high security video surveillance system of the present invention, as shown in fig. 2, which is a specific transmission diagram of the high security video surveillance system of the present invention, the system includes: a plurality of anti-theft video signal communication units and a monitoring terminal module; wherein each anti-theft video signal communication unit comprises: the device comprises a video signal acquisition encryption module and a video signal decoding module. The monitoring terminal can be a computer.
Wherein the video signal decoding module includes: a dual optical feedback loop, an optical isolator OI 19, a fiber amplifier 18 (erbium doped fiber amplifier EDFA1), a fiber coupler FC217, a polarization controller PC 416, an adjustable attenuator VA 415, a second response laser 14(R-DFB2), a second laser controller 13, a polarization controller PC512, an adjustable attenuator VA511, an adjustable attenuator VA 69, a polarization controller PC 610, a balanced detector 31, a data conversion module 32, a drive laser (D-DFB) 30 and a third laser controller 29.
Wherein, video signal gathers encryption module and contains: the device comprises a network camera 1, a fiber-optic transceiver 2, a first delay line 3, a first laser controller 4, a first response laser 5(R-DFB1), an adjustable attenuator VA 36, a polarization controller PC 37 and a fiber-optic coupler FC 18.
The video signal acquisition encryption module and the video signal decoding module are connected with the monitoring terminal module through the data conversion module 32 and the router 33.
The third laser controller 29 is electrically connected with the driving laser D-DFB 30, controls the driving laser D-DFB 30 to emit light signals, generates chaotic signals with time delay characteristic suppression through a double-light feedback loop, and divides the chaotic signals into two paths after passing through an optical isolator OI 19, an optical fiber amplifier 18 and an optical fiber coupler FC 217:
(1) one path of the video signal is transmitted to a polarization controller PC 37 of the video signal acquisition encryption module, a broadband chaotic signal II with further suppressed delay characteristics is continuously output through an adjustable attenuator VA 36 and a first response laser 5(R-DFB1), the broadband chaotic signal II is transmitted to an optical fiber coupler FC 18 through a first delay line 3, a video signal acquired by a network camera is transmitted to the optical fiber coupler FC 18 through an optical fiber transceiver 2, and is loaded with the chaotic signal with suppressed delay characteristics obtained through the first delay line 3 to realize video signal encryption, so that encryption of video information transmitted by a system is realized, and the encrypted signal is transmitted to a balance detector 31 through the adjustable attenuator VA 69 and the polarization controller PC 610;
(2) the other path is transmitted to the polarization controller PC 416, the adjustable attenuator VA 415, and the second response laser 14(R-DFB2) to output the broadband chaotic signal one with the time delay characteristic further suppressed, and is transmitted to the balanced detector 31 through the adjustable attenuator VA511 and the polarization controller PC 512.
The delay, power and polarization state of two chaotic signals (a broadband chaotic signal two and a broadband chaotic signal one) in the video signal decoding module and the video signal acquisition and encryption module are respectively controlled and adjusted by the first delay line 3, the adjustable attenuator VA 69, the polarization controller PC 610, the adjustable attenuator VA511 and the polarization controller PC512, the two chaotic signals can realize high-quality synchronization, decoded video signals are output after passing through the balance detector 31, the decoded signals output from the balance detector 31 are converted into video signals conforming to RJ45 transmission after passing through the data conversion module 32, and the signals are transmitted to the monitoring terminal module 34, so that the monitoring of a preset target is realized. In addition, the computer terminal can adjust the angle of the camera and the focal length of the lens according to actual needs.
The dual optical feedback loop comprises: circulator 20, fiber coupler FC 421, fiber coupler FC322, second delay line 23, polarization controller PC 124, adjustable attenuator VA 125, polarization controller PC 226, adjustable attenuator VA 227, and fiber coupler FC 528. The optical signal is divided into two parts after passing through the circulator 20 and the fiber coupler FC 421:
(1) one part of the signal is transmitted to the optical fiber coupler FC322 and then divided into two paths, one path of the signal is transmitted to the optical fiber coupler FC 528 through the second delay line 23, the polarization controller PC 124 and the adjustable attenuator VA 125, and finally is fed back to the driving laser 30 through the circulator 20 to form a first external cavity feedback loop;
(2) the other part is transmitted to the fiber coupler FC 528 via the polarization controller PC 226 and the adjustable attenuator VA 227, and finally fed back to the driving laser 30 via the circulator 20, forming a second external cavity feedback loop.
The second delay line 23 described above is used to adjust the difference between the two external cavity feedback loop delays to approximately half the relaxation oscillation time of the drive laser 30.
Specifically, light emitted by a driving laser (D-DFB) enters a fiber coupler FC 421 with a splitting ratio of 2:8 through a circulator OC (fiber circulator) 20, then 80% of the light passes through a fiber coupler FC322 with a splitting ratio of 5:5, and one of the light passes through a fiber delay line 23, a polarization controller PC 124, an adjustable attenuator VA 125, a fiber coupler FC 528 with a splitting ratio of 5:5 and the circulator OC 20 and then is fed back to the laser to form a first external cavity feedback loop; the other part of the light output from the fiber coupler FC322 is fed back to the laser via the polarization controller PC 226, the adjustable attenuator VA 227, the fiber coupler FC 528 with the splitting ratio of 5:5 and the circulator OC 20 to form a second external cavity feedback loop.
Specifically, the splitting ratio of the fiber coupler FC217 is 5: 5.
Specifically, the laser of the present invention can adopt commercial DFB, which can effectively reduce the cost of the system.
The working principle of the high-confidentiality video monitoring system is based on the confidential transmission of chaotic signals, most of the chaotic signals generated by the conventional optical feedback-based semiconductor laser have obvious time delay characteristics, and the system is easily reconstructed by a third party, so that huge security holes can be caused. In addition, under the influence of relaxation oscillation of the semiconductor laser, the energy of the chaotic signal generated by the optical feedback semiconductor laser is mainly concentrated near the relaxation oscillation frequency in the frequency domain, so that the frequency spectrum is uneven, the low frequency suppression is serious, and the bandwidth is narrow, which can seriously limit the transmission rate of chaotic optical communication. The high-confidentiality video monitoring system adopts the chaotic signal with the time delay characteristic effectively suppressed, and the working principle is as follows:
firstly, a laser controller is utilized to control the working current and the temperature of a driving laser 30, and then the delay difference of two external cavity feedback loops is adjusted to be approximately equal to half of the relaxation oscillation time of the driving laser 30 through a second delay line 23;
subsequently, the feedback intensities in the two feedback loops are adjusted through the adjustable attenuator VA 125 and the adjustable attenuator VA 227, so that the drive laser 30 outputs chaotic signals under the two external cavity feedback loops respectively;
finally, the driving laser 30 can output a chaotic signal with suppressed time delay characteristics under two specific external cavity feedback loops, the chaotic signal is injected into two response lasers (a first response laser 5 and a second response laser 14), the two response lasers can output broadband chaotic signals with further suppressed time delay characteristics, the symmetrical chaotic synchronization system can realize high-quality chaotic synchronization of the chaotic signals output by the two response lasers, the video signal collected by the camera is loaded into a second broadband chaotic signal output by the first response laser to realize encryption of video information, at a video signal decoding end, the encrypted video signal and a first broadband signal generated by the second response laser are input into a balanced detector, and the chaotic synchronization of the high quality of the two signals can realize decoding of the video information, thereby realizing the secure transmission of the video information.
In addition, a plurality of anti-theft video signal communication units enter the computer terminal through the router of the monitoring terminal module, real-time monitoring on a plurality of set targets can be achieved, and therefore the possibility is provided for networking of a high-security video monitoring network.
While the present invention has been described in detail with reference to the preferred embodiments, it should be understood that the above description should not be taken as limiting the invention. Various modifications and alterations to this invention will become apparent to those skilled in the art upon reading the foregoing description. Accordingly, the scope of the invention should be determined from the following claims.
Claims (10)
1. A high security video surveillance system, comprising: a plurality of anti-theft video signal communication units and a monitoring terminal module (34); wherein each anti-theft video signal communication unit comprises: the device comprises a video signal acquisition encryption module and a video signal decoding module;
in the video signal decoding module, after light emitted by a driving laser (30) passes through a dual-optical feedback loop, an optical isolator (19), an optical fiber amplifier (18) and an optical fiber coupler FC2(17), one path of light enters the video signal acquisition encryption module, the other path of light enters a balanced detector (31) through a second response laser (14), the second response laser (14) is injected into a chaotic signal which is output by the dual-optical feedback loop and has time delay characteristic suppression, a broadband chaotic signal I with the time delay characteristic further suppressed is obtained, and the broadband chaotic signal I is used for decrypting the encrypted video signal; wherein the dual optical feedback loop has: the time delay difference of the two external cavity feedback loops is equal to half of relaxation oscillation time of the driving laser (30), and a chaotic signal with suppressed time delay characteristic is output through the double optical feedback loop;
in the video signal acquisition encryption module, an optical signal is input to a first response laser (5) of the video signal acquisition encryption module through the video signal decoding module, and is loaded together with a video signal acquired by a network camera after passing through a first delay line (3) so as to be encrypted and transmitted to a balance detector (31) of the video signal decoding module; the first response laser (5) is injected into a chaotic signal with time delay characteristic suppression output by a double-optical feedback loop to obtain a broadband chaotic signal II with further suppressed time delay characteristic, and the broadband chaotic signal II is used for encrypting a video signal;
the second response laser (14) and the first response laser (5) respectively generate a broadband chaotic signal I and a broadband chaotic signal II which can realize high-quality chaotic synchronization and suppress time delay characteristics, and the balance detector (31) can output a decoded video signal and transmit the signal to the monitoring terminal module (34) by adjusting the time delay, the power and the polarization state of the two signals.
2. A high security video surveillance system as claimed in claim 1, wherein said dual optical feedback loop comprises: a circulator (20), a fiber coupler FC4(21), a fiber coupler FC3(22), a second delay line (23), a polarization controller PC1(24), an adjustable attenuator VA1(25), a polarization controller PC2(26), an adjustable attenuator VA2(27), and a fiber coupler FC5 (28);
after light emitted by the driving laser (30) passes through the circulator (20), the fiber coupler FC4(21) and the fiber coupler FC3(22), one part of the light is transmitted to the fiber coupler FC5(28) through the second delay line (23), the polarization controller PC1(24) and the adjustable attenuator VA1(25), and the light is fed back to the driving laser (30) through the circulator (20) to form a first external cavity feedback loop; the other part is transmitted to a fiber coupler FC5(28) through a polarization controller PC2(26) and an adjustable attenuator VA2(27), and is fed back to a driving laser (30) through a circulator (20) to form a second outer cavity feedback loop.
3. The high security video surveillance system of claim 2, wherein the fiber optic coupler FC4(21) has a split ratio of 2:8, and the fiber optic coupler FC2(17), fiber optic coupler FC5(28), and fiber optic coupler FC3(22) each have a split ratio of 5: 5; after passing through the fiber coupler FC4(21), 80% of the light was transmitted to the fiber coupler FC3 (22).
4. The high-security video monitoring system of claim 2, wherein in the video signal decoding module, the chaotic signal with suppressed delay characteristics obtained by feeding back the chaotic signal to the driving laser (30) through the circulator (20) passes through an optical isolator (19), a fiber amplifier (18) and a fiber coupler FC2(17), and a part of the chaotic signal enters a polarization controller PC3(7) and an adjustable VA attenuator 3(6) and is transmitted to the first response laser (5); the other part is transmitted to the second responding laser (14) via the polarization controller PC4(16), the adjustable attenuator VA4 (15).
5. The high-security video surveillance system according to claim 4, wherein the broadband chaotic signal with suppressed time delay characteristics generated by the second response laser (14) is transmitted to the balanced detector (31) via an adjustable attenuator VA5(11) in the video signal decoding module, a polarization controller PC5 (12); the broadband chaotic signal with suppressed time delay characteristics generated by the first response laser (5) is transmitted to the balanced detector (31) through a fiber coupler FC1(8), an adjustable attenuator VA6(9) in a video signal decoding module and a polarization controller PC6 (10).
6. A high security video surveillance system according to claim 1, characterized in that the first response laser (5) is electrically connected to a first laser controller (4); the second response laser (14) is electrically connected with a second laser controller (13); the drive laser (30) is electrically connected with a third laser controller (29).
7. A high security video surveillance system according to claim 1, characterized in that said fiber amplifier (18) is an erbium doped fiber amplifier.
8. A high security video surveillance system according to claim 1, characterized in that the driving laser (30), the first response laser (5) and the second response laser (14) all have an operating wavelength of 1550 nm.
9. The high-security video monitoring system according to claim 1, wherein the monitoring terminal module (34) can adjust the angle and the focal length of each webcam according to actual conditions.
10. A high-security video monitoring system as claimed in claim 1, wherein said balance detector (31) transmits the decoded video signal to said monitoring terminal module (34) via data conversion module (32) and router (33); the data conversion module (32) converts the decoded video signal into a video signal conforming to RJ45 transmission.
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| CN113448622B (en) * | 2021-01-20 | 2022-05-06 | 北京仁光科技有限公司 | Multi-signal-source interface interaction system |
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| FR2779296B1 (en) * | 1998-06-02 | 2000-08-18 | France Telecom | DEVICE FOR TRANSMITTING OR RECEIVING A SIGNAL ENCRYPTED BY DETERMINIST CHAOS |
| US8110159B2 (en) * | 2007-08-31 | 2012-02-07 | Gooch And Housego Plc | AOTF-based imaging system and method for hyperspectral and multispectral imaging of specimens including medical tissue |
| CN106788964B (en) * | 2017-02-17 | 2020-02-21 | 西南大学 | WRC-FPLD and WDM-PON networking-based chaotic secret communication device and method |
| CN107769859B (en) * | 2017-10-19 | 2019-08-13 | 华中科技大学 | A kind of security photo-communication system based on phase-magnitude conversion |
| CN108155559B (en) * | 2017-12-25 | 2020-06-30 | 武汉电信器件有限公司 | Chaotic semiconductor laser based on random optical feedback and use method thereof |
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| CN105915854A (en) * | 2016-05-27 | 2016-08-31 | 东莞市联洲知识产权运营管理有限公司 | Long-distance video monitoring system based on laser chaos |
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