CN111901094B - Multi-span laser chaotic relay secret transmission system - Google Patents
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Abstract
The invention provides a multi-span laser chaotic relay secret transmission system which comprises a sending end, a relay transmission link and a receiving end. The chaotic laser emitted by the laser chaotic source at the transmitting end is divided into two paths, one path is encrypted with information source information after being digitalized and then modulated onto an optical carrier. The modulated optical signal and the other chaotic laser are combined into one path by a wavelength division multiplexer and then injected into a transmission link. The relay transmission link is composed of a plurality of sections, wherein each section is composed of an optical fiber, an optical amplifier, a laser chaotic repeater and the like. The receiving end separates the chaotic laser and the signal light through a wavelength division demultiplexer. The chaotic light is injected into the synchronous laser chaotic source to realize synchronization with the transmitting laser chaotic source. And the signal light is decrypted with the digitized synchronous laser chaotic signal after being subjected to photoelectric detection, and the original information is finally recovered. The invention can realize high-speed long-distance secret communication of signals with various modulation formats under the condition of being compatible with the existing communication architecture to the maximum extent.
Description
Technical Field
The invention relates to the field of laser chaotic communication, in particular to a multi-span high-speed laser chaotic relay secret transmission system.
Background
The laser chaos has the characteristics of noise-like characteristics, extremely sensitive initial conditions, unpredictability and the like, and has important application in the fields of secret communication, high-speed physical random numbers and the like. In the laser chaotic secret communication, useful information can be hidden by using the noise-like characteristic of the chaotic laser, or the transmission information is encrypted by using a high-speed physical random number generated by the chaotic laser. In either way, high-quality laser chaotic synchronization needs to be constructed for realizing the transmission of chaotic secret information. In 2005, the european union team realized 1Gbit/s OOK signals and 120 km confidential transmission (Nature,2005, vol.438, pp.343-346) based on a semiconductor laser, and 2010 realized 2.5Gbit/s OOK signals and 120 km confidential transmission (Optics Express,2010, vol.18, pp.5188-5198). A French team in 2010 realizes the 10Gbit/s OOK signal and 100-kilometer chaotic secret transmission (IEEE Journal of light wave Technology,2010, Vol.28, pp.1430-1435) based on a photoelectric oscillator, and then a domestic team realizes the 30Gbit/s OOK signal and 100-kilometer chaotic secret transmission (Optics Letter, 2018, Vol.43, pp.1323-1326). The reported laser chaotic secret communication system and method all adopt a single-span type (a transmission link is a single-section optical fiber without a relay function), an OOK modulation mode and a single polarization state transmission mode, the maximum transmission rate is 30Gbit/s, and the longest distance of chaotic synchronization and communication is only about 100 kilometers. Therefore, in terms of transmission rate and transmission distance, there is a considerable gap compared with the conventional optical fiber communication system (the single-wave transmission rate is more than or equal to 100Gbit/s, and the transmission distance is hundreds to thousands of kilometers). In addition, the laser chaotic secure communication system reported at present needs to change the structure of the existing optical fiber communication system more or less.
Therefore, on the basis of being compatible with the existing optical fiber communication system architecture as much as possible, constructing a multi-span laser chaotic relay secret transmission system is necessary for realizing high speed, long distance and practicability of laser chaotic communication.
Disclosure of Invention
The invention provides a multi-span laser chaotic relay secret transmission system for realizing high-speed long-distance laser chaotic secret communication. To achieve the object of the present invention, the system of the present invention is as follows.
A multi-span laser chaotic relay secret transmission system comprises: the system comprises a sending end, a relay transmission link and a receiving end.
The transmitting end comprises: the system comprises a laser chaotic source, a digitalization device, an encryption device, an optical modulation device, an information source and a wavelength division multiplexer;
the relay transmission link includes: the optical fiber, the optical amplifier, the laser chaotic repeater, the wavelength division multiplexer and the wavelength division demultiplexer;
the receiving end includes: a wavelength division demultiplexer, a synchronous laser chaotic source, photoelectric detection, digitization, decryption and information sink;
the chaotic laser emitted by the laser chaotic source at the transmitting end is divided into two paths, one path is encrypted with information source information after being digitized and then modulated to an optical carrier (the wavelength is lambda)s) The above. The modulated optical signal and the other chaotic laser (with the wavelength of lambda)c) And the mixed signal is synthesized into one path by a wavelength division multiplexer and then injected into a relay transmission link. The relay transmission link is composed of a plurality of sections, and each section is composed of an optical fiber, an optical amplifier, a laser chaotic repeater and the like. The optical amplifier is used for compensating the loss of the chaotic laser and the signal light, and the laser chaotic repeater is used for compensating the link damage of the chaotic laser. The receiving end separates the chaotic laser and the signal light through a wavelength division demultiplexer. The chaotic laser is used for driving the synchronous laser chaotic source to realize synchronization with the transmitting laser chaotic source. And the signal light is decrypted with the digitized synchronous laser chaotic signal after being subjected to photoelectric detection, and the original information is finally recovered.
Preferably, the optical modulation at the transmitting end may adopt various modulation modes such as Amplitude Modulation (AM), Phase Modulation (PM), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), and polarization multiplexing mode; the encryption method may adopt various logical operation methods such as and, or, xnor, xor, and the like.
Preferably, the working mode of the laser chaotic repeater can adopt an open-loop mode, a closed-loop mode and the like.
Preferably, the working mode of the synchronous laser chaotic source can adopt an open-loop mode, a closed-loop mode and the like; the photoelectric detection mode can adopt a direct detection mode or a coherent detection mode according to a modulation mode of a sending end.
Compared with the prior art, the invention has the beneficial technical effects that: various modulation modes such as Amplitude Modulation (AM), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM) and the like and polarization multiplexing modes can be adopted, and coherent detection modes are combined to realize high-speed laser chaotic secret communication. And a multi-span laser chaotic relay secret transmission link is constructed to prolong the laser chaotic synchronization and secret communication distance. The invention can realize high-speed and long-distance laser chaotic secret communication of various modulation formats on the basis of being compatible with the existing optical fiber communication system architecture as much as possible.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a block diagram of a multi-span laser chaotic relay secure transmission system according to the present invention;
fig. 2(a) is a time domain waveform of a transmitting-end chaotic laser source, fig. 2(b) is a time domain waveform of a receiving-end synchronous chaotic laser source in a back-to-back condition, and fig. 2(c) is a correlation coefficient of the receiving-end synchronous chaotic laser source and the transmitting-end chaotic laser source in a back-to-back condition;
fig. 3(a) - (d) are correlation coefficients of the chaotic laser signal and the laser chaotic signal at the transmitting end after transmission through 1, 2, 3 and 4 relay links, respectively;
fig. 4(a) is a time domain waveform of the synchronous chaotic laser source after transmission through the 5-segment relay link, and fig. 4(b) is a correlation coefficient of the receiving-end synchronous chaotic laser source and the transmitting-end chaotic laser signal after transmission through the 5-segment relay link.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
The overall overview of the multi-span laser chaotic relay secure transmission system and the communication method of the embodiment is as follows: a multi-span laser chaotic relay secure transmission system of the present embodiment is shown in fig. 1. The system consists of a sending end, a relay transmission link and a receiving end. Wherein, the sending end includes: the system comprises a laser chaotic source, a digitalization device, an encryption device, an optical modulation device, an information source and a wavelength division multiplexer; the relay transmission link includes: the optical fiber, the optical amplifier, the laser chaotic repeater, the wavelength division multiplexer and the wavelength division demultiplexer; the receiving end includes: wavelength division demultiplexer, synchronous laser chaotic source, photoelectric detection, digitization, decryption and information sink. The working principle of the system is as follows:
the chaotic laser emitted by the laser chaotic source at the sending end is divided into two paths, one path of chaotic laser is subjected to photoelectric conversion and digitization to obtain a physical random digital signal m (t), and then the physical random digital signal m (t) and the information source information s (t) are encrypted to obtain an encrypted signal y (t). The encryption mode may adopt various logical operation modes such as and, or, xnor, xor, etc., for example:
and encryption: y (t) s (t) m (t) (and)
Or encryption: y (t) ═ s (t) + m (t) ("+" is or operation)
The "same or" encryption: y (t) ("s (t) (") m (t) (") OR)
Xor encryption: y (t) ═ s (t) · m (t) ("or
The encrypted signal is modulated to an optical carrier (wavelength lambda) by an optical modulators) Thus, a modulated optical signal is obtained. Compared with the reported laser chaotic communication method in the background technology, the scheme adopts chaotic signal digitization, so that the modulation mode of the encrypted signal is not limited to OOK any more. All modulation schemes in conventional optical fiber communication systems can be adopted, such as: amplitude Modulation (AM), Phase Modulation (PM), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM), and the like, and polarization multiplexing systems. Therefore, higher rate signal transmission can be achieved.
Modulated optical signal (wavelength λ)s) With the other path of chaotic laser (wavelength is lambda)c) Via wavelength division multiplexingAnd injecting the mixture into a relay transmission link after the mixture is formed into a path. The relay transmission link is composed of a plurality of sections, and each section is composed of an optical fiber, an optical amplifier, a laser chaotic repeater, a wavelength division demultiplexer and a wavelength division multiplexer. The signal light and the chaotic laser are transmitted by a section of optical fiber and then injected into an optical amplifier to compensate the loss of an optical fiber link. Then, the signal light (lambda) is transmitted through a wavelength division demultiplexers) And chaotic laser (lambda)c) Is divided into two paths. The chaotic laser is injected into a laser chaotic repeater which takes a semiconductor laser as a core device. The semiconductor laser in the laser chaotic repeater can adopt an open loop or closed loop feedback mode. The chaotic light and the signal light which pass through the chaotic repeater are combined into one path by a wavelength division multiplexer and then sent to the next section of transmission link. After multi-section link transmission, the chaotic light and the signal light are sent to a receiving end to carry out laser chaotic synchronization and information demodulation. Due to the adoption of the laser chaotic relay mode, the link damage of the chaotic laser can be compensated through the laser chaotic relay, so that the synchronization of the ultra-long distance laser chaotic signal and the transmission of the chaotic secret signal can be realized. Fig. 2(a) - (c) show the time domain waveforms and correlation coefficients of the sending end and the receiving end synchronous laser chaotic sources respectively under the condition that the systems are back to back. Fig. 3(a) - (d) show the correlation coefficients of the chaotic laser signal and the transmitting-end laser chaotic source after transmission through 1, 2, 3 and 4 sections of relay links (where each span is 80 km of dispersion management fiber). Fig. 4(a) - (b) show the time domain waveform of the receiving-end synchronous laser chaotic source and the correlation coefficient with the transmitting-end laser chaotic source after 5-segment relay link transmission, respectively. From the above results, it can be seen that after the transmission of 400 km of optical fiber, the receiving-end synchronous laser chaotic source and the transmitting-end laser chaotic source still maintain good synchronization characteristics (e.g., the correlation coefficient is 0.92). Namely, the invention can completely realize laser chaotic communication of hundreds of kilometers and even kilometers. The receiving end separates the chaotic laser and the signal light through a wavelength division demultiplexer. The chaotic laser is injected into the synchronous laser chaotic source to realize synchronization of the transmitting laser chaotic source. The obtained synchronous chaotic laser is digitalized in the same digitalization mode as that of the sending end. Modulation method and multiplexing method of signal light according to transmissionAnd a direct detection or coherent detection mode is selected for photoelectric conversion. The converted electric signal and the digitized chaotic signal are decrypted according to a corresponding encryption mode, and the original information is finally recovered.
The above-mentioned embodiments are only specific embodiments of the present application, and are used for illustrating the technical solutions of the present application, but not limiting the same, and the scope of the present application is not limited thereto, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: any person skilled in the art can modify or easily conceive the technical solutions described in the foregoing embodiments or equivalent substitutes for some technical features within the technical scope disclosed in the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the present disclosure, which should be construed in light of the above teachings. Are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (4)
1. A multi-span laser chaotic relay secret transmission system is characterized in that: the system comprises a sending end, a relay transmission link and a receiving end;
the transmitting end comprises: the system comprises a laser chaotic source, a digitalization device, an encryption device, an optical modulation device, an information source and a wavelength division multiplexer;
the relay transmission link includes: the optical fiber, the optical amplifier, the laser chaotic repeater, the wavelength division multiplexer and the wavelength division demultiplexer;
the receiving end includes: a wavelength division demultiplexer, a synchronous laser chaotic source, photoelectric detection, digitization, decryption and information sink;
chaotic laser emitted by a laser chaotic source at a sending end is divided into two paths, one path is encrypted with information source information after being digitalized and then modulated onto an optical carrier; the modulated optical signal and another chaotic laser are combined into a signal path through a wavelength division multiplexer to become an input signal of a relay transmission link and are injected into the relay transmission link, the input signal of the relay transmission link enters a wavelength division demultiplexer through an optical amplifier, a first signal path output by the wavelength division demultiplexer is combined with a second signal path output by the wavelength division demultiplexer into a signal path through the wavelength division multiplexer to become an output signal of the relay transmission link, the relay transmission link is composed of N sections, each section is composed of an optical fiber, an optical amplifier, a laser chaotic repeater, the wavelength division multiplexer and the wavelength division demultiplexer, the output signal of the N section enters the wavelength division demultiplexer of a receiving end after passing through the optical amplifier, and the chaotic laser and the signal light in the amplified output signal of the N section are separated by the wavelength division demultiplexer; the chaotic laser drives the synchronous laser chaotic source to generate chaotic laser which is synchronous with the sending end, the synchronous chaotic laser adopts the same digital mode as the sending end to obtain a digital chaotic signal which is synchronous with the sending end, and the signal light is decrypted with the digital synchronous laser chaotic signal after being subjected to photoelectric detection, so that the original information is finally recovered.
2. The multi-span laser chaotic relay secret transmission system according to claim 1, wherein the optical modulation at the transmitting end adopts one of Amplitude Modulation (AM), Quadrature Phase Shift Keying (QPSK), Quadrature Amplitude Modulation (QAM) and polarization multiplexing; the encryption mode adopts one of logical operation modes of AND, OR, XNOR and XOR.
3. The multi-span laser chaotic relay secret transmission system according to claim 1, characterized in that the working mode of the laser chaotic relay adopts one of an open-loop mode and a closed-loop mode.
4. The multi-span laser chaotic relay secret transmission system according to claim 1, characterized in that the working mode of the synchronous laser chaotic source adopts an open-loop mode or a closed-loop mode; the photoelectric detection mode selects a direct detection mode or a coherent detection mode according to the modulation mode of the sending end.
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| CN102347590A (en) * | 2011-08-18 | 2012-02-08 | 西南交通大学 | Laser chaotic signal generating device capable of hiding feedback delay characteristic |
| CN105049126A (en) * | 2015-08-03 | 2015-11-11 | 西南交通大学 | Optical phase modulated signal transmission plan based on multi-polarization state |
| CN108964873A (en) * | 2018-08-01 | 2018-12-07 | 武汉邮电科学研究院有限公司 | Physical layer means of defence, system, network-building method and the network of chaos optical-fiber network |
| CN111277337A (en) * | 2020-02-24 | 2020-06-12 | 电子科技大学 | Physical layer secret optical fiber communication system based on chaos phase encryption |
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| US9264788B2 (en) * | 2014-06-27 | 2016-02-16 | Fujitsu Limited | Inter-channel spectral shaping in optical ring networks |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102347590A (en) * | 2011-08-18 | 2012-02-08 | 西南交通大学 | Laser chaotic signal generating device capable of hiding feedback delay characteristic |
| CN105049126A (en) * | 2015-08-03 | 2015-11-11 | 西南交通大学 | Optical phase modulated signal transmission plan based on multi-polarization state |
| CN108964873A (en) * | 2018-08-01 | 2018-12-07 | 武汉邮电科学研究院有限公司 | Physical layer means of defence, system, network-building method and the network of chaos optical-fiber network |
| CN111277337A (en) * | 2020-02-24 | 2020-06-12 | 电子科技大学 | Physical layer secret optical fiber communication system based on chaos phase encryption |
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