CN116192261B - Long-distance laser chaotic synchronization system based on optical phase conjugation - Google Patents
Long-distance laser chaotic synchronization system based on optical phase conjugation Download PDFInfo
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- CN116192261B CN116192261B CN202310040031.9A CN202310040031A CN116192261B CN 116192261 B CN116192261 B CN 116192261B CN 202310040031 A CN202310040031 A CN 202310040031A CN 116192261 B CN116192261 B CN 116192261B
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- 230000000739 chaotic effect Effects 0.000 title claims abstract description 109
- 230000003287 optical effect Effects 0.000 title claims abstract description 49
- 230000021615 conjugation Effects 0.000 title claims abstract description 30
- 230000005540 biological transmission Effects 0.000 claims abstract description 47
- 239000013307 optical fiber Substances 0.000 claims abstract description 39
- 230000001360 synchronised effect Effects 0.000 claims abstract description 20
- 238000002347 injection Methods 0.000 claims description 5
- 239000007924 injection Substances 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 4
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 13
- 239000006185 dispersion Substances 0.000 description 11
- 239000000243 solution Substances 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 238000000034 method Methods 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 230000009022 nonlinear effect Effects 0.000 description 1
- 230000010287 polarization Effects 0.000 description 1
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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
- H04B10/25—Arrangements specific to fibre transmission
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
- H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A90/00—Technologies having an indirect contribution to adaptation to climate change
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Abstract
The invention provides a long-distance laser chaotic synchronization system based on optical phase conjugation. The other path is transmitted through a long-distance optical fiber link and then injected into a chaotic laser source at a receiving end to generate chaotic laser synchronous with a transmitting end. In order to realize high-quality synchronization of laser chaos of a transmitting end and a receiving end after long-distance optical fiber transmission, an optical phase conjugation device is constructed in the middle of a transmission link, so that compensation of link damage is realized, and the synchronization quality of the laser chaos after long-distance transmission is improved. The invention can prolong the distance of laser chaotic synchronization and improve the synchronization quality under the condition of being compatible with the existing optical fiber communication architecture to the maximum extent.
Description
Technical Field
The invention relates to the field of optical fiber communication, in particular to a long-distance laser chaotic synchronization system based on optical phase conjugation.
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 utilizing the noise-like characteristic of chaotic laser, or transmission information is encrypted by utilizing high-speed physical random numbers generated by the chaotic laser. In either way, long-distance high-quality laser chaotic synchronization is required to be constructed for being compatible with the existing optical fiber communication system architecture and matching with the existing optical fiber communication distance and speed. In 2005, the European Union team realized 1Gbit/s OOK signal and 120 km secret transmission based on semiconductor lasers (Nature, 2005, vol.438, pp.343-346), and 2010 realized 2.5Gbit/s OOK signal and 120 km secret transmission (Optics Express, 2010, vol.18, pp.5188-5198). The France team in 2010 realizes chaotic secret transmission of speed 10Gbit/s OOK signals and 100 km based on a photoelectric oscillator (IEEE Journal of Lightwave Technology, 2010, vol.28, pp.1430-1435), and then the domestic team realizes chaotic secret transmission of speed 30Gbit/s OOK signals and 100 km (Optics letters, 2018, vol.43, pp.1323-1326). The reported laser chaotic secret communication system and method all adopt a single span type (the transmission link is a single section of optical fiber and has no 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 km. Because of the limitation of link dispersion and nonlinearity, the scheme has a quite large 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 terms of transmission rate and transmission distance. Recently, domestic teams use electric domain dispersion compensation technology (IEEE Journal of Lightwave Technology, 2020, vol.38, pp.4648-4665), dispersion compensation optical fibers (Optics letters, 2022, vol.44, pp.913-916) and the like to realize chaos synchronization of hundred kilometers and even thousand kilometers. However, these laser chaotic synchronization systems more or less require changes to existing fiber optic communication system architectures.
Therefore, on the basis of being compatible with the existing optical fiber communication system architecture as much as possible, the influence of link dispersion and nonlinearity is reduced, and the construction of a long-distance multi-span laser chaotic synchronization system is necessary for realizing high-speed, long-distance and practical laser chaotic communication.
Disclosure of Invention
The invention provides a long-distance laser chaotic synchronization system based on optical phase conjugation, which reduces the damage of transmission link dispersion and nonlinearity to chaotic driving signals through optical phase conjugation, prolongs the distance of laser chaotic synchronization and improves the synchronization quality. To achieve the object of the invention, the system of the invention is as follows:
a long-distance laser chaotic synchronization system based on optical phase conjugation, comprising: the device comprises a chaotic driving light source, a transmitting-end chaotic laser source, a transmission link and a receiving-end synchronous chaotic light source.
The transmission link includes: an erbium-doped fiber amplifier, an optical fiber, and an optical phase conjugator;
the optical phase conjugator includes: a pump light source, a nonlinear medium, an optical coupler and an optical filter;
the driving laser emitted by the chaotic driving light source passes through the coupler and is equally divided into two paths. One path of chaotic laser is injected into a chaotic laser source at a transmitting end to generate transmitting chaotic laser. The other path is injected into the long-distance optical fiber transmission link. In order to realize high-quality synchronization of laser chaos of a transmitting end and a receiving end after long-distance optical fiber transmission, an optical fiber transmission chain consists of a first half optical fiber link, a second half optical fiber link and an optical phase conjugation device. The front half part and the rear half part of the transmission link are respectively composed of a plurality of sections of optical fibers with equal lengths, and the loss of each section of optical fiber is compensated by a corresponding optical fiber amplifier. The optical phase conjugator is composed of a pumping light source, a nonlinear medium, an optical coupler and an optical filter. The signal light and the pump light transmitted by the first half part of the optical fiber generate an idler frequency light conjugated with the phase of the signal light through four-wave mixing in a nonlinear medium. And then, filtering out the idler frequency light by an optical filter, and sending the idler frequency light into a second half part of optical fiber link to be transmitted to a receiving end so as to drive a synchronous chaotic light source at the receiving end to generate synchronous chaotic laser. Because the signal light and the idler light have a phase conjugation relationship and the transmission link has symmetry, the chaotic driving signal is subjected to opposite dispersion, nonlinearity and other damages on the front half part and the rear half part of the transmission link, so that the damage of the transmission link to the chaotic driving signal can be reduced as much as possible, the distance of laser chaotic synchronization is prolonged, and the synchronization quality is improved.
Preferably, the synchronization mode adopts a common-drive injection synchronization mode;
preferably, the chaotic driving light source can be any broadband random light source;
preferably, the working modes of the chaotic laser source at the transmitting end and the synchronous chaotic light source at the receiving end can adopt an open loop mode or a closed loop mode; the chaotic feedback mode can adopt one of traditional optical feedback and phase conjugation feedback.
Preferably, the optical phase conjugator is realized by adopting a four-wave mixing mode, wherein the pumping mode can adopt one of a single pumping structure and a double pumping structure; the nonlinear medium may employ one of a semiconductor optical amplifier, a highly nonlinear optical fiber, and a nonlinear waveguide.
Compared with the prior art, the invention has the beneficial technical effects that: according to the invention, the laser chaotic synchronization system is designed by using a common drive source chaotic synchronization mode, and the dispersion and nonlinearity in the optical fiber link are compensated by adopting an optical phase conjugation technology, so that the damage of the transmission link dispersion and nonlinearity to chaotic drive signals is reduced, the distance of laser chaotic synchronization is prolonged, and the synchronization quality is improved. Compared with the existing scheme, the invention can completely compensate second-order dispersion and inhibit nonlinear effect in the all-optical environment; the system structure of the common driving source ensures the safety and confidentiality of a synchronous system, and can also hide the chaotic time delay characteristic when the chaotic injection mode is changed from the traditional optical injection to the phase conjugate injection; in addition, the scheme can be maximally compatible with the architecture foundation of the existing optical fiber communication system.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a block diagram of a long-distance laser chaotic synchronization system based on optical phase conjugation;
FIG. 2 is a schematic block diagram of optical phase conjugation;
FIG. 3 (a) is a time domain waveform of a chaotic laser generated by a driving laser chaotic source; fig. 3 (b) is a chaotic laser time domain waveform generated by a transmitting-end chaotic laser source; fig. 3 (c) is a time domain waveform of the chaotic laser generated by the synchronous chaotic light source of the receiving end in a back-to-back condition; fig. 3 (d) shows the correlation coefficient between the sending end chaotic laser and the receiving end synchronous chaotic light in the back-to-back condition;
FIGS. 4 (a) - (b) are time domain amplitude waveforms and phases before optical phase conjugation of chaotic laser generated by a driving laser chaotic source; FIGS. 4 (c) - (d) are time domain amplitude waveforms and phases after optical phase conjugation of chaotic laser generated by a driving laser chaotic source;
FIG. 5 (a) is a time domain waveform of a chaotic laser generated by a synchronous chaotic light source at a receiving end after transmission through an 800km transmission link; fig. 5 (b) shows the correlation coefficient between the transmitting-end chaotic laser and the receiving-end synchronous chaotic light after being transmitted through an 800km transmission link.
Description of the embodiments
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, 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 apparent that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to be within the scope of the present application.
The general overview of a long-distance laser chaotic synchronization system based on optical phase conjugation in this embodiment is: a block diagram of a long-distance laser chaotic synchronization system based on optical phase conjugation in the embodiment is shown in FIG. 1. The system consists of a chaotic driving light source, a transmitting-end chaotic laser source, a transmission link and a receiving-end synchronous chaotic light source. The driving laser emitted by the chaotic driving light source passes through the coupler and is equally divided into two paths. One path of chaotic laser is injected into a chaotic laser source at a transmitting end to generate transmitting chaotic laser. The other path is transmitted through a long-distance optical fiber link and then injected into a chaotic laser source at a receiving end to generate chaotic laser synchronous with a transmitting end. In order to realize high-quality synchronization of laser chaos of a transmitting end and a receiving end after long-distance optical fiber transmission, an optical fiber transmission chain consists of three parts. The front half part and the rear half part of the transmission link are composed of N sections of optical fibers, and the loss of each section of optical fiber is compensated by a corresponding optical fiber amplifier. An optical phase conjugator is constructed in the middle of the transmission link, so that the chaotic driving signal is subjected to opposite dispersion, nonlinearity and other damages on the front half part and the rear half part of the transmission link, the compensation of the link damage is realized, and the synchronization quality of laser chaos after long-distance transmission is improved. The optical phase conjugator is formed by adopting a four-wave mixing principle, and fig. 2 is a schematic diagram of an optical phase conjugation principle of a double-pump mode.
Fig. 3 (a) - (d) respectively show time domain waveforms of the chaotic laser generated by the driving laser chaotic source, time domain waveforms of the chaotic laser generated by the transmitting end chaotic laser source, and correlation coefficients of the transmitting end chaotic laser and the receiving end synchronous chaotic light in the back-to-back case that sum of time domain waveforms of the chaotic laser generated by the receiving end synchronous chaotic light source is back-to-back.
FIGS. 4 (a) - (b) are time domain amplitude waveforms and phases before optical phase conjugation of chaotic laser generated by a driving laser chaotic source; fig. 4 (c) - (d) are time domain amplitude waveforms and phases after optical phase conjugation of chaotic laser generated by a driving laser chaotic source. The result shows that before and after optical phase conjugation, the chaotic laser of the signal injected into the optical phase conjugator is opposite to the chaotic laser after conversion, and the phase conjugation relation is satisfied.
FIG. 5 (a) is a time domain waveform of a chaotic laser generated by a synchronous chaotic light source at a receiving end after transmission through an 800km transmission link, wherein the front half part and the rear half part of the transmission link are respectively composed of 5 sections of 80km standard single-mode fibers; fig. 5 (b) shows the correlation coefficient between the transmitting-end chaotic laser and the receiving-end synchronous chaotic light after being transmitted through an 800km transmission link. As can be seen from fig. 5 (b), after the transmission with the total length of 800km, the whole link can still realize high-quality chaotic synchronization with the correlation coefficient of 0.989 without additionally adopting a dispersion compensation module.
The foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the corresponding technical solutions. Are intended to be encompassed within the scope of this application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (5)
1. The long-distance laser chaotic synchronization system based on optical phase conjugation is characterized in that: comprises a chaotic driving light source, a transmitting end chaotic laser source, a transmission link and a receiving end synchronous chaotic light source,
the transmission link includes: an erbium-doped fiber amplifier, an optical fiber, and an optical phase conjugator;
the optical phase conjugator includes: a pump light source, a nonlinear medium, an optical coupler and an optical filter; the transmission link consists of a front half section of optical fiber link, a rear half section of optical fiber link and an optical phase conjugator;
driving laser emitted by the chaotic driving light source passes through a coupler and is equally divided into two paths, one path is injected into a chaotic laser source at a transmitting end to generate transmission chaotic laser, and the other path is injected into the transmission link, wherein the front half part and the rear half part of the transmission link are respectively composed of a plurality of sections of optical fibers with equal length, and the loss of each section of optical fiber is compensated by a corresponding optical fiber amplifier; the signal light and the pump light transmitted by the first half part of optical fiber generate an idler frequency light conjugated with the phase of the signal light through four-wave mixing in a nonlinear medium, and then the idler frequency light is filtered out by an optical filter and then is transmitted into the second half part of optical fiber link to be transmitted to a receiving end so as to drive a synchronous chaotic light source of the receiving end to generate synchronous chaotic laser.
2. The long-distance laser chaotic synchronization system based on optical phase conjugation of claim 1, wherein a common-drive injection synchronization mode is adopted.
3. The long-distance laser chaotic synchronization system based on optical phase conjugation of claim 1, wherein the chaotic driving light source can be any broadband random light source.
4. The long-distance laser chaotic synchronization system based on optical phase conjugation according to claim 1, wherein the working modes of the transmitting-end chaotic laser source and the receiving-end synchronous chaotic laser source can adopt an open-loop mode or a closed-loop mode; the chaotic feedback mode can adopt one of traditional optical feedback and phase conjugation feedback.
5. The long-distance laser chaotic synchronization system based on optical phase conjugation of claim 1, wherein when the optical phase conjugation is realized by four-wave mixing, one of a single-pump structure and a double-pump structure can be adopted as a pumping mode; the nonlinear medium may employ one of a semiconductor optical amplifier, a highly nonlinear optical fiber, and a nonlinear waveguide.
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| US20150285728A1 (en) * | 2009-12-11 | 2015-10-08 | Washington University | Detection of nano-scale particles with a self-referenced and self-heterodyned raman micro-laser |
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