CN113259002A - Infrared chaotic laser secret communication method in free space and communication system thereof - Google Patents
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- 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
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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Abstract
The invention discloses an infrared chaotic laser secret communication method in free space and a communication system thereof, belonging to the technical field of chaotic laser secret communication; the technical problem to be solved is as follows: the improvement of an infrared chaotic laser secret communication method in free space is provided; the technical scheme for solving the technical problems is as follows: the method comprises the following steps: generating broadband chaotic laser C by emitting laserT(t); modulating the digital signal m (t) to the current of an information loading laser to obtain a mid-infrared light signal m (t); the receiving laser and the transmitting laser are synchronously output through unidirectional injection, and the chaotic laser output by the receiving laser is CR(t); the mid-infrared light signal m (t) is hidden in the chaotic laser CT(t) transmitting to the receiving end through the atmospheric channel, receiving the laserThe chaotic filtering is used for information demodulation, and the obtained recovery information is m' (t) = CT(t)+m(t)‑CR(t), realizing the free space chaotic laser secret communication; the invention is applied to secure communication.
Description
Technical Field
The invention discloses an infrared chaotic laser secret communication method in free space and a communication system thereof, belonging to the technical field of infrared chaotic laser secret communication in free space.
Background
The ground battlefield mobile command communication based on free space laser communication needs extremely high security, and unprotected information transmission and an open communication channel have the condition that signals are intercepted and the communication is not interrupted, so that the information is threatened by security. As a first protection to ensure information security, the security of information transmission is particularly important.
The chaos secret is a hopeful high-speed information encryption technology and can be used for free space laser secret transmission. At present, the bottleneck restricting the development of the free space chaotic light communication is the lack of a broadband chaotic light source suitable for atmospheric transmission. At present, chaotic lasers in wave bands of 0.7 mu m and 1.5 mu m are greatly influenced by weather during free space transmission, and the information demodulation quality is limited. The mid-infrared laser in the 3-5 mu m wave band of the atmospheric transmission window has good atmospheric transmission characteristic, has transmission loss lower than other wave bands, and is not easily influenced by weather factors.
Therefore, the intermediate infrared broadband chaotic laser generated by the interband cascade laser is used as a light source of the free space chaotic laser secret communication, is slightly influenced by atmospheric transmission loss and weather, and can ensure the communication quality.
Disclosure of Invention
In order to overcome the defects in the prior art, the invention aims to solve the technical problems that: the improvement of the infrared chaotic laser secret communication method in the free space is provided.
In order to solve the technical problems, the invention adopts the technical scheme that: an infrared chaotic laser secret communication method in free space comprises the following steps:
the method comprises the following steps: generating broadband chaotic laser C by emitting laserT(t)；
Step two: modulating the digital signal m (t) to the current of an information loading laser to obtain a mid-infrared light signal m (t);
step three: the receiving laser and the transmitting laser are synchronously output through unidirectional injection, and the chaotic laser output by the receiving laser is CR(t)；
Step four: the mid-infrared light signal m (t) is hidden in the chaotic laser CTIn the step (t), the information is transmitted to a receiving end through an atmospheric channel, chaotic filtering is used for information demodulation at a receiving laser, and the obtained recovery information is m' (t) = CT(t)+ m(t)- CRAnd (t) realizing the free space chaotic laser secret communication.
Generating broadband chaotic laser C by the emitting laser in the step oneTThe specific steps of (t) are as follows:
an interband cascade laser is used as a transmitting laser, light emitted by the transmitting laser is collimated by a first focusing lens, split by a first beam splitter, transmitted by a first polarizer, reflected by a coated gold mirror and returned to the transmitting laser in the original path;
by adjusting the direction of the first polaroid and the position of the coated gold mirror, the feedback light intensity and the feedback light time delay of the feedback branch of the interband cascade laser are respectively regulated and controlled, and the broadband chaotic laser C is finally generated by combining the setting of the bias current of the laserT(t)。
The second step is specifically as follows:
the digital signal output by the arbitrary waveform generator is directly modulated to the current of the information loading laser, the output mid-infrared light signal m (t) is used as information, and after the information is transmitted by the second focusing lens and the third beam splitter, the light pathOverlap-hidden to chaotic laser CT(t) above.
The third step is specifically as follows:
the broadband mid-infrared chaotic laser generated by the transmitting laser is transmitted through an optical isolator, a second beam splitter, a second polaroid, a third beam splitter, a fourth beam splitter, a fifth beam splitter and a fourth focusing lens and then injected into the receiving laser, and by controlling the intensity of injected light and controlling the bias current of the transmitting laser to be the same as that of the receiving laser, the receiving laser and the transmitting laser synchronously output chaotic laser CR(t)。
The fourth step is specifically as follows:
chaotic carrier C carrying informationT(t) + m (t) is transmitted to the first quantum well infrared detector through the fourth beam splitter and the third focusing lens;
receiving the chaotic laser output by the laser, and transmitting the chaotic laser to a second quantum well infrared detector through a fourth focusing lens, a fifth beam splitter and a fifth focusing lens;
demodulating the information at an oscilloscope in a chaotic filtering manner to obtain recovered information of m' (t) = CT(t)+ m(t)- CR(t)。
The amplitude of the mid-infrared light signal m (t) is smaller than that of the chaotic light carrier CT(t), and the current modulation rate, namely the signal rate, is less than 80% of the energy bandwidth of the chaotic carrier;
the transmitting laser and the receiving laser specifically adopt interband cascade lasers with consistent parameters and have no isolator inside;
the information loading laser specifically adopts an interband cascade laser and a built-in optical isolator.
The infrared chaotic laser secret communication system in the free space comprises a transmitting laser, a receiving laser and an arbitrary waveform generator, wherein light emitted by the transmitting laser is split by a first beam splitter after passing through a first focusing lens, one part of light is reflected by a coated gold mirror after being transmitted by a first polaroid and returns to the transmitting laser in the original path, and broadband chaotic laser C is generated by adjusting the direction of the first polaroid and the position of the coated gold mirrorT(t)Then the light enters a third beam splitter after sequentially passing through an optical isolator, a second beam splitter and a second polaroid;
the signal output by the arbitrary waveform generator is modulated onto the current of the information loading laser, and the output mid-infrared light signal is transmitted through the second focusing lens and the third beam splitter, is overlapped and hidden with the chaotic laser light path output by the second beam splitter, then sequentially passes through the fourth beam splitter, the fifth beam splitter and the fourth focusing lens, and then enters the receiving laser;
the chaotic carrier carrying information is transmitted to a first quantum well infrared detector through a fourth focusing lens and a third focusing lens, chaotic laser output by a receiving laser is transmitted to a second quantum well infrared detector through the fourth focusing lens, the fifth focusing lens and the fifth focusing lens, the chaotic laser is input into an oscilloscope through the first quantum well infrared detector and the second quantum well infrared detector, the oscilloscope finds corresponding time for the input information, and then difference subtraction is carried out to realize demodulation, so that recovery information is obtained.
The first beam splitter also splits a part of light to enter a power meter for measuring the power of the chaotic laser output by the transmitting laser.
The transmitting laser and the receiving laser specifically adopt interband cascade lasers with consistent parameters and have no isolator inside;
the information loading laser specifically adopts an interband cascade laser and a built-in optical isolator.
Compared with the prior art, the invention has the beneficial effects that: compared with the prior art, the infrared chaotic laser secret communication system in the free space has the advantages that the influence of atmospheric transmission loss and weather on the adopted intermediate infrared laser is small, and the demodulation information quality is high; the chaotic light secret communication is adopted to hide information onto broadband chaotic light similar to noise, and information demodulation is realized by combining the filtering characteristic of chaotic synchronization.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is a schematic structural view of the present invention;
in the figure: the device comprises a laser 1, a first focusing lens 2, a first beam splitter 3, a first polaroid 4, a coated gold mirror 5, a power meter 6, an optical isolator 7, a second beam splitter 8, a second polaroid 9, an information loading laser 10, an arbitrary waveform generator 11, a second focusing lens 12, a third beam splitter 13, a fourth beam splitter 14, a third focusing lens 15, a first quantum well infrared detector 16, an oscilloscope 17, a fifth beam splitter 18, a fourth focusing lens 19, a receiving laser 20, a fifth focusing lens 21 and a second quantum well infrared detector 22.
Detailed Description
As shown in fig. 1, the invention relates to a secret communication method of infrared chaotic laser in free space, which comprises the following steps:
the method comprises the following steps: generating broadband chaotic laser C by emitting laserT(t)；
Step two: modulating the digital signal m (t) to the current of an information loading laser to obtain a mid-infrared light signal m (t);
step three: the receiving laser and the transmitting laser are synchronously output through unidirectional injection, and the chaotic laser output by the receiving laser is CR(t)；
Step four: the mid-infrared light signal m (t) is hidden in the chaotic laser CTIn the step (t), the information is transmitted to a receiving end through an atmospheric channel, chaotic filtering is used for information demodulation at a receiving laser, and the obtained recovery information is m' (t) = CT(t)+ m(t)- CRAnd (t) realizing the free space chaotic laser secret communication.
Generating broadband chaotic laser C by the emitting laser in the step oneTThe specific steps of (t) are as follows:
an interband cascade laser is used as a transmitting laser, light emitted by the transmitting laser is collimated by a first focusing lens, split by a first beam splitter, transmitted by a first polarizer, reflected by a coated gold mirror and returned to the transmitting laser in the original path;
by adjusting the direction of the first polaroid and the position of the coated gold mirror, feedback of the interband cascade laser is respectively regulated and controlledThe feedback light intensity and feedback light time delay of the branch circuit are combined with the setting of the bias current of the laser to finally generate broadband chaotic laser CT(t)。
The second step is specifically as follows:
directly modulating a digital signal output by an arbitrary waveform generator to a current of an information loading laser, taking an output mid-infrared light signal m (t) as information, transmitting the information through a second focusing lens and a third beam splitter, and overlapping and hiding a light path to chaotic laser CT(t) above.
The third step is specifically as follows:
the broadband mid-infrared chaotic laser generated by the transmitting laser is transmitted through an optical isolator, a second beam splitter, a second polaroid, a third beam splitter, a fourth beam splitter, a fifth beam splitter and a fourth focusing lens and then injected into the receiving laser, and by controlling the intensity of injected light and controlling the bias current of the transmitting laser to be the same as that of the receiving laser, the receiving laser and the transmitting laser synchronously output chaotic laser CR(t)。
The fourth step is specifically as follows:
chaotic carrier C carrying informationT(t) + m (t) is transmitted to the first quantum well infrared detector through the fourth beam splitter and the third focusing lens;
receiving the chaotic laser output by the laser, and transmitting the chaotic laser to a second quantum well infrared detector through a fourth focusing lens, a fifth beam splitter and a fifth focusing lens;
demodulating the information at an oscilloscope in a chaotic filtering manner to obtain recovered information of m' (t) = CT(t)+ m(t)- CR(t)。
The amplitude of the mid-infrared light signal m (t) is smaller than that of the chaotic light carrier CT(t), and the current modulation rate, namely the signal rate, is less than 80% of the energy bandwidth of the chaotic carrier;
the transmitting laser and the receiving laser specifically adopt interband cascade lasers with consistent parameters and have no isolator inside;
the information loading laser specifically adopts an interband cascade laser and a built-in optical isolator.
The secret communication system of infrared chaos laser in free space comprises a transmitting laser 1, a receiving laser 20 and an arbitrary waveform generator 11, wherein light emitted by the transmitting laser 1 is split by a first beam splitter 3 after passing through a first focusing lens 2, part of the light is reflected by a coated gold mirror 5 after being transmitted by a first polaroid 4 and returns to the transmitting laser 1 in the original way, and broadband chaos laser C is generated by adjusting the direction of the first polaroid and the position of the coated gold mirrorT(t) then sequentially passes through the optical isolator 7, the second beam splitter 8 and the second polaroid 9 and then enters the third beam splitter 13;
the signal output by the arbitrary waveform generator 11 is modulated onto the current of the information loading laser 10, and the output mid-infrared light signal is transmitted through the second focusing lens 12 and the third beam splitter 13, overlapped and hidden with the chaotic laser light path output by the second polarizing film 9, and then sequentially passes through the fourth beam splitter 14, the fifth beam splitter 18 and the fourth focusing lens 19 and enters the receiving laser 20;
the chaotic carrier carrying information is transmitted to a first quantum well infrared detector 16 through a fourth beam splitter 14 and a third focusing lens 15, the chaotic laser output by a receiving laser 20 is transmitted to a second quantum well infrared detector 22 through a fourth focusing lens 19, a fifth beam splitter 18 and a fifth focusing lens 21, the chaotic laser is input into an oscilloscope 17 through the first quantum well infrared detector 16 and the second quantum well infrared detector 22, the oscilloscope 17 finds corresponding time for the input information and then performs subtraction and demodulation to obtain recovered information.
The first beam splitter 3 also splits off a part of light to enter a power meter 6 for measuring the power of the chaotic laser output by the transmitting laser 1.
The transmitting laser 1 and the receiving laser 20 specifically adopt interband cascade lasers with consistent parameters and have no isolator inside;
the information loading laser 10 specifically adopts an interband cascade laser and a built-in optical isolator.
The invention provides an infrared chaotic laser secret communication method in free space, which comprises the following steps: building an optical feedback interband cascade laser at a transmitting end to generate a broadband hybridChaos laser CT(t) the receiving laser 20 and the emitting laser 1 are synchronously output through unidirectional injection, and the chaotic laser output by the receiving laser 20 is CR(t) of (d). The digital signal m (t) is modulated onto the current of the information-loading laser 10 to obtain the mid-infrared optical signal m (t). The mid-infrared light signal m (t) is hidden in the chaotic carrier CTIn (t), the signal is transmitted to the receiving end through an atmospheric channel, and the chaotic filtering is used for information demodulation at the receiving laser 20, so that the obtained recovery information is m' (t) = CT(t)+ m(t)- CRAnd (t) realizing the free space chaotic secret optical communication.
The transmitting laser 1 and the receiving laser 20 select the interband cascade laser with the isolator removed and the parameters consistent. The information loading laser 10 employs an interband cascade laser with a built-in isolator. The digital signal is output by an Arbitrary Waveform Generator (AWG).
The invention relates to an infrared chaotic laser secret communication system in free space, which comprises:
an optical feedback interband cascade laser is set up at a transmitting end to generate broadband chaotic laser; after being collimated by the first focusing lens 2, light emitted by the interband cascade laser is split by the first beam splitter 3, transmitted by the first polarizer 4, reflected by the coated gold mirror 5, and returned to the interband cascade laser in the original path; the feedback light intensity and the feedback light time delay of the feedback branch of the interband cascade laser are respectively regulated and controlled by regulating the direction of the first polaroid 4 and the position of the coated gold mirror 5, and the setting of the bias current of the laser is combined to finally realize the broadband chaotic laser CT(t) an output; the power meter 6 is used for measuring the power of the chaotic laser output by the transmitting laser 1.
The broadband mid-infrared chaotic laser generated by the transmitting laser 1 is transmitted by an optical isolator 7, a second beam splitter 8, a second polaroid 9, a third beam splitter 13, a fourth beam splitter 14, a fifth beam splitter 18 and a fourth focusing lens 19 and then injected into a receiving laser 20, so that the injection light intensity is gradually increased, the bias current of the receiving and transmitting laser is ensured to be the same, and the receiving laser 20 and the transmitting laser 1 synchronously output chaotic laser; wherein the intensity of the injected light is gradually increased and the light intensity is controlled by adjusting the angle of the first polarizer 4, and the transmitting laser 1 and the receiving laser 20 select interband cascade lasers with consistent parameters and no isolator inside.
Information loading is carried out by selecting a chaotic mask mode, a digital signal output by an arbitrary waveform generator 11 is directly modulated onto the current of an information loading laser 10, an output mid-infrared light signal m (t) is used as information, and after the output mid-infrared light signal m (t) is transmitted through a second focusing lens 12 and a third beam splitter 13, an optical path is overlapped and hidden in a chaotic light carrier CT(t) above; the information loading laser 10 employs an interband cascade laser and a built-in optical isolator.
The chaotic carrier C carrying the information is usedT(t) + m (t) is transmitted to the first quantum well infrared detector 16 through the fourth beam splitter 14 and the third focusing lens 15; receiving the chaotic laser output by the laser 20, and transmitting the chaotic laser to a second quantum well infrared detector 22 through a third focusing lens 19, a fifth beam splitter 18 and a fifth focusing lens 21; the information is demodulated by means of chaotic filtering at the oscilloscope 17, and the obtained recovery information is m' (t) = CT(t)+ m(t)- CR(t)。
In order to effectively hide and demodulate, the invention needs to control the current modulation depth and ensure that the amplitude of the mid-infrared light signal m (t) is less than that of the chaotic light carrier CTAnd (t), the current modulation rate, namely the signal rate, is less than 80% of the energy bandwidth of the chaotic carrier. Meanwhile, the time for the chaotic laser output by the optical isolator 7 to reach the oscilloscope 17 is required to be controlled to be the same as the time for the chaotic laser output by the receiving laser 20 to reach the oscilloscope 17, wherein the reaching time is calculated by dividing the optical path length of the transmitting laser and the receiving laser by the light speed, so that the time for the chaotic laser output by the optical isolator 7 to reach the oscilloscope 17 is controlled to be the same as the time for the chaotic laser output by the receiving laser 20 to reach the oscilloscope 17.
The invention provides a communication system suitable for space optical secret communication, which is built by using an interband cascade laser as a chaotic light source of free space secret communication, and intermediate infrared broadband chaotic laser generated by the interband cascade laser is used as a light source of the free space chaotic laser secret communication, so that the communication quality can be ensured under the small influence of atmospheric transmission loss and weather.
It should be noted that, regarding the specific structure of the present invention, the connection relationship between the modules adopted in the present invention is determined and can be realized, except for the specific description in the embodiment, the specific connection relationship can bring the corresponding technical effect, and the technical problem proposed by the present invention is solved on the premise of not depending on the execution of the corresponding software program.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (9)
1. An infrared chaotic laser secret communication method in free space is characterized in that: the method comprises the following steps:
the method comprises the following steps: generating broadband chaotic laser C by emitting laserT(t)；
Step two: modulating the digital signal m (t) to the current of an information loading laser to obtain a mid-infrared light signal m (t);
step three: the receiving laser and the transmitting laser are synchronously output through unidirectional injection, and the chaotic laser output by the receiving laser is CR(t)；
Step four: the mid-infrared light signal m (t) is hidden in the chaotic laser CTIn (t), the signal is transmitted to a receiving end through an atmospheric channel, and information demodulation is carried out at the receiving laser by using chaotic filteringThe obtained recovery information is m' (t) = CT(t)+ m(t)- CRAnd (t) realizing the free space chaotic laser secret communication.
2. The secret communication method of the infrared chaotic laser in the free space according to claim 1, characterized in that: generating broadband chaotic laser C by the emitting laser in the step oneTThe specific steps of (t) are as follows:
an interband cascade laser is used as a transmitting laser, light emitted by the transmitting laser is collimated by a first focusing lens, split by a first beam splitter, transmitted by a first polarizer, reflected by a coated gold mirror and returned to the transmitting laser in the original path;
by adjusting the direction of the first polaroid and the position of the coated gold mirror, the feedback light intensity and the feedback light time delay of the feedback branch of the interband cascade laser are respectively regulated and controlled, and the broadband chaotic laser C is finally generated by combining the setting of the bias current of the laserT(t)。
3. The secret communication method of the infrared chaotic laser in the free space according to claim 2, characterized in that: the second step is specifically as follows:
directly modulating a digital signal output by an arbitrary waveform generator to a current of an information loading laser, taking an output mid-infrared light signal m (t) as information, transmitting the information through a second focusing lens and a third beam splitter, and overlapping and hiding a light path to chaotic laser CT(t) above.
4. The secret communication method of the infrared chaotic laser in the free space according to claim 3, characterized in that: the third step is specifically as follows:
the broadband mid-infrared chaotic laser generated by the transmitting laser is transmitted through an optical isolator, a second beam splitter, a second polaroid, a third beam splitter, a fourth beam splitter, a fifth beam splitter and a fourth focusing lens and then injected into the receiving laser, and the receiving laser is realized by controlling the intensity of injected light and simultaneously controlling the bias current of the transmitting laser to be the same as that of the receiving laserOptical device and emission laser device synchronously output chaotic laser CR(t)。
5. The secret communication method of the infrared chaotic laser in the free space according to claim 4, characterized in that: the fourth step is specifically as follows:
chaotic carrier C carrying informationT(t) + m (t) is transmitted to the first quantum well infrared detector through the fourth beam splitter and the third focusing lens;
receiving the chaotic laser output by the laser, and transmitting the chaotic laser to a second quantum well infrared detector through a fourth focusing lens, a fifth beam splitter and a fifth focusing lens;
demodulating the information at an oscilloscope in a chaotic filtering manner to obtain recovered information of m' (t) = CT(t)+ m(t)- CR(t)。
6. The secret communication method of the infrared chaotic laser in the free space according to claim 5, characterized in that: the amplitude of the mid-infrared light signal m (t) is smaller than that of the chaotic light carrier CT(t), and the current modulation rate, namely the signal rate, is less than 80% of the energy bandwidth of the chaotic carrier;
the transmitting laser and the receiving laser specifically adopt interband cascade lasers with consistent parameters and have no isolator inside;
the information loading laser specifically adopts an interband cascade laser and a built-in optical isolator.
7. The infrared chaotic laser secret communication system in the free space comprises a transmitting laser (1) and a receiving laser (20), and is characterized in that: the chaotic broadband laser system is characterized by further comprising an arbitrary waveform generator (11), light emitted by the emission laser (1) is split by the first beam splitter (3) after passing through the first focusing lens (2), part of the light is transmitted by the first polaroid (4) and then reflected by the coated gold mirror (5) and then returns to the emission laser (1) in the original way, and the chaotic broadband laser C is generated by adjusting the direction of the first polaroid and the position of the coated gold mirrorT(t) is followed by lightThe isolator (7), the second beam splitter (8) and the second polarizer (9) enter the third beam splitter (13);
the signal output by the arbitrary waveform generator (11) is modulated onto the current of the information loading laser (10), the output mid-infrared light signal is transmitted through a second focusing lens (12) and a third beam splitter (13), and then is overlapped and hidden with a chaotic laser light path output by a second polarizing film (9), and then sequentially passes through a fourth beam splitter (14), a fifth beam splitter (18) and a fourth focusing lens (19) and enters a receiving laser (20);
the chaotic carrier carrying information is transmitted to a first quantum well infrared detector (16) through a fourth beam splitter (14) and a third focusing lens (15), chaotic laser output by a receiving laser (20) is transmitted to a second quantum well infrared detector (22) through a fourth focusing lens (19), a fifth beam splitter (18) and a fifth focusing lens (21), the chaotic laser is input into an oscilloscope (17) through the first quantum well infrared detector (16) and the second quantum well infrared detector (22), and the oscilloscope (17) finds corresponding time for the input information and then performs subtraction to realize demodulation to obtain recovery information.
8. The infrared chaotic laser secret communication system in free space according to claim 7, characterized in that: the first beam splitter (3) also splits a part of light to enter a power meter (6) for measuring the power of the chaotic laser output by the transmitting laser (1).
9. The infrared chaotic laser secret communication system in free space according to claim 7, characterized in that: the transmitting laser (1) and the receiving laser (20) specifically adopt interband cascade lasers with consistent parameters and have no isolators inside;
the information loading laser (10) specifically adopts an interband cascade laser and is internally provided with an optical isolator.
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| CN113472517A (en) * | 2021-08-23 | 2021-10-01 | 太原理工大学 | QCL (quaternary clock language) -based two-path high-speed free space chaos hiding secret communication method and device |
| CN113472516A (en) * | 2021-08-23 | 2021-10-01 | 太原理工大学 | QCL-based two-way high-speed free space chaos keying secret communication method and device |
| CN113746618A (en) * | 2021-08-31 | 2021-12-03 | 太原理工大学 | Method and device for generating time delay-free chaos in parallel based on quantum integrated laser |
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