CN109743114B - Bidirectional multipath chaotic laser communication system and communication method - Google Patents
Bidirectional multipath chaotic laser communication system and communication method Download PDFInfo
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Abstract
The invention discloses a bidirectional multipath chaotic laser communication system and a communication method, wherein a beam of continuous laser is injected into an isolator-free multi-longitudinal-mode semiconductor laser with external cavity random grating feedback to realize the spectrum broadening of the delay-free characteristic multi-mode chaotic laser; the wavelength of the injected light is adjusted to regulate and control the chaotic laser spectrum bandwidth output by the isolator-free multi-longitudinal-mode semiconductor laser and the chaotic laser spectrum bandwidth of each sub-mode, and the chaotic laser spectrum bandwidths are separated by a wavelength division multiplexer according to the longitudinal-mode wavelength and serve as chaotic laser carriers of multi-path communication; the obtained wide-spectrum, multi-mode and time-delay-free chaotic laser is divided into three paths through two couplers to form two closed loop structures which are respectively used for realizing forward and reverse multi-path information loading, transmission and demodulation. The invention does not need to generate synchronous chaotic laser by two lasers, simplifies the system structure, not only has the capability of realizing bidirectional multi-path information safety communication, but also can realize the function of simultaneously loading information with different rates.
Description
Technical Field
The invention relates to the field of broadband chaotic laser communication, in particular to a bidirectional multipath chaotic laser communication system and a communication method, which can be used for chaotic laser wavelength division multiplexing secret communication.
Background
The chaotic laser has the characteristics of sensitivity, unpredictability, wide frequency spectrum, high energy and the like, so that the chaotic laser has important application in the field of information security. Such as chaotic secure communication, high speed true random code generation, etc. In the research of chaotic secure communication, people apply chaotic laser broadband and large amplitude characteristics to chaotic optical secure transmission, and successively and successfully realize secure transmission with one path of unidirectional information rate of 1Gb/s [ Nature, Vol.17, p.348, 2005], 2.5 Gb/s [ Opt. Express, Vol.18, p.5188-. In order to realize high-speed information security transmission, broadband chaotic laser synchronization is usually required to be constructed, however, the broadband chaotic laser synchronization is difficult to realize, and the broadband chaotic laser is susceptible to the influence of optical fiber dispersion, so that the synchronization quality is degraded, and further noise is introduced to reduce the signal-to-noise ratio of demodulation information [ j. Lightwave technol., vol.28, p.2688, 2010 ]. A binary format modulation researcher is utilized to realize one-way unidirectional loaded 30Gb/s information transmission [ Opt. Lett., Vol. 43, p. 1323-.
In an actual communication system, both parties of legal communication need not only one-way communication, but also two-way secure communication. The two-way communication system is initially constructed by using two lasers to be mutually coupled and synchronized, but the chaotic synchronization is unstable under the structure, and the requirements on the parameters and the coupling strength of the lasers are higher [ Phys. Rev. Lett., Vol. 86, p. 795-. Therefore, in subsequent researches, symmetrical external cavity mirror feedback is added on the basis of the mutual coupling laser, and stable isochronous chaotic laser output can be realized within a larger feedback-coupling parameter range [ Phys. Rev. E, Vol. 73, p. 066214, 2006 ]. Also based on the mutually coupled mirror feedback structure, the two-way communication of three users has been reported [ Opt. Comm. Vol. 423, p. 155-. In order to realize the loading of high-speed information, broadband chaotic laser synchronization still needs to be constructed. On the basis of the mutual coupling laser, a bundle of chaotic laser is injected simultaneously, so that the bandwidth of the synchronous chaotic laser can be widened, and 10Gb/s information transmission [ nonlinear Dyn, Vol, 76, p, 399-. Two non-isolator semiconductor lasers are driven to be synchronous by common chaotic laser, and another optical fiber for information transmission is constructed, so that bidirectional 10Gb/s communication of two users can be realized [ J. Lightwave technol., Vol. 31, p. 461-467, 2013 ].
In summary, a prerequisite for achieving single and bidirectional secret transmission of information is that the transmitting and receiving systems in the chaotic communication system simultaneously generate high-quality synchronous chaotic laser. The bandwidth of the chaotic laser used for loading information determines the loading speed of information, so that higher requirements are put on hardware in high-speed information transmission in practical application, and 3 lasers [ nonlinear Dyn, Vol 76, p 399-. Except that the bandwidth of the chaotic laser determines the loading rate of information, the external cavity time delay characteristic of the chaotic laser directly influences the safety of the system. In order to eliminate the external cavity delay characteristic of the chaotic laser, it is a common practice in chaotic laser communication systems to introduce a more complex external cavity feedback structure [ opt. commun., vol. 352, p.77-83, 2015, opt. lett., vol. 41, p.3690, 2016 ]. The complex external cavity feedback structure not only increases the implementation difficulty in practical application, but also introduces errors, and reduces the signal-to-noise ratio of demodulation information [ opt. commun., vol. 352, p. 77-83, 2015 ]. The reported bidirectional multi-path chaotic laser secure communication also needs 3 lasers and relies on the synchronization of the chaotic laser, and the loading rate of each path of information is only 2Gb/s [ Nonlinear Dyn, Vol.86, p.1937-. Based on the idea that information loading and information transmission share independent channels, researchers recently proposed a semiconductor laser device with digital control random optical feedback and no isolator to realize two-way communication between two users [ photon. j., vol. 10, p. 7908308 ]. Although the scheme generates chaotic laser without time delay characteristics and does not need to drive two communication lasers to carry out chaotic synchronization to load information, the spectral width of the chaotic laser used for communication is not greatly broken, the information transmission rate is still not 10Gb/s, and the requirement of the short-distance communication rate of 3km, 10km and 40km, namely 25Gb/s in the existing information transmission scheme [ Chin. Opt. Lett., Vol. 15, p. 022502 and 2017] cannot be met.
Therefore, the chaotic laser communication system has the advantages that the system structure is simplified, wide-spectrum chaotic laser without time delay characteristics is generated, and the chaotic laser communication system is necessary to realize a bidirectional and multipath communication system.
Disclosure of Invention
The invention provides a bidirectional multi-path chaotic laser communication system and a communication method, aiming at solving the problems that the information rate in the current chaotic secret communication system is limited by the influence of the bandwidth of a synchronous chaotic laser spectrum and the chaotic laser generated by the traditional external cavity feedback has the external cavity time delay characteristic, and the chaotic secret communication system has the advantages that the bandwidth of the chaotic laser spectrum is adjustable and controllable, the external cavity time delay characteristic is avoided, and the chaotic secret communication system can be used for simultaneously loading bidirectional multi-path information with different rates.
The invention is realized by the following technical scheme: a bidirectional multipath chaotic laser communication system comprises an optical injection part generated by ultra-wideband chaotic laser, a multi-wavelength chaotic laser generation part without time delay characteristic, a forward multipath information loading, transmitting and demodulating part and a reverse multipath information loading, transmitting and demodulating part;
the light injection part generated by the ultra-wideband chaotic laser comprises a single-mode band isolator wavelength tunable semiconductor laser, the output end of the single-mode band isolator wavelength tunable semiconductor laser is connected with the input end of a first erbium-doped fiber amplifier, the output end of the first erbium-doped fiber amplifier is connected with the input end of a first fiber polarization controller, the output end of the first fiber polarization controller is connected with the first input end of a first 1 x 2 50:50 coupler, and the output end of the first 1 x 2 50:50 coupler is connected with the first port of a first optical circulator;
the non-time-delay characteristic multi-wavelength chaotic laser generating part comprises a non-isolator multi-longitudinal-mode semiconductor laser, the output end of the non-isolator multi-longitudinal-mode semiconductor laser is connected with a second port of a first optical circulator, a third port of the first optical circulator is connected with the input end of a second erbium-doped optical fiber amplifier, the output end of the second erbium-doped optical fiber amplifier is connected with the input end of a first optical fiber polarization controller, the output end of the first optical fiber polarization controller is connected with a first port of a second optical circulator, a second port of the second optical circulator is connected with the input end of a random grating, a third port of the second optical circulator is connected with a second input end of a first 1 x 2 50:50 coupler, the output end of the random grating is connected with the input end of the first optical isolator, and the output end of the first optical isolator is connected with the input end of a second 1 x 2 50:50 coupler;
the forward multi-path information loading, transmitting and demodulating part comprises a third 1X 2 50:50 coupler, the first output end of the second 1X 2 50:50 coupler is connected with the input end of the third 1X 2 50:50 coupler, the first output end of the third 1X 2 50:50 coupler is connected with the input end of a second optical isolator, the output end of the second optical isolator is connected with the input end of a first wavelength division multiplexer, the output end of the first wavelength division multiplexer is connected with the input end of a first information encoder, the output end of the first information encoder is connected with the input end of a second wavelength division multiplexer, the output end of the second wavelength division multiplexer is connected with the input end of a first optical fiber, the output end of the first optical fiber is connected with the input end of a third wavelength division multiplexer, the output end of the third wavelength division multiplexer is connected with the input end of a first photoelectric detector, the output end of the first photoelectric detector is connected with the input end of a, the output end of the first information decoder is connected with the input end of the second photoelectric detector, the second output end of the third 1X 2 50:50 coupler is connected with the input end of the second optical fiber, the output end of the second optical fiber is connected with the input end of the fourth 1X 2 50:50 coupler, the first output end of the fourth 1X 2 50:50 coupler is connected with the input end of the third optical isolator, the output end of the third optical isolator is connected with the input end of the fourth wavelength division multiplexer, and the output end of the fourth wavelength division multiplexer is connected with the input end of the second photoelectric detector;
the reverse multi-path information loading, transmitting and demodulating part comprises a fourth optical isolator, a second output end of a fourth 1X 2 50:50 coupler is connected with an input end of the fourth optical isolator, an output end of the fourth optical isolator is connected with an input end of a fifth wavelength division multiplexer, an output end of the fifth wavelength division multiplexer is connected with an input end of a second information encoder, an output end of the second information encoder is connected with an input end of a sixth wavelength division multiplexer, an output end of the sixth wavelength division multiplexer is connected with an input end of a third optical fiber, an output end of the third optical fiber is connected with an input end of a seventh wavelength division multiplexer, an output end of the seventh wavelength division multiplexer is connected with an input end of a third photoelectric detector, an output end of the third photoelectric detector is connected with an input end of a second information decoder, an input end of the second information decoder is connected with an output end of a fourth photoelectric detector, a second output end of the second 1X 250, the output end of the fifth optical isolator is connected with the input end of a fourth optical fiber, the output end of the fourth optical fiber is connected with the input end of an eighth wavelength division multiplexer, and the output end of the eighth wavelength division multiplexer is connected with the input end of a fourth photoelectric detector.
The communication method of the bidirectional multi-path chaotic laser communication system specifically comprises the following steps: the isolator-free multi-longitudinal-mode semiconductor laser receives two beams of light through a first optical circulator, wherein one beam of light is injected light from a single-mode isolator-wavelength-tunable semiconductor laser, and the other beam of light is feedback light from a random grating and is used for generating multi-wavelength chaotic laser without time delay characteristics and spectrum broadening; the first erbium-doped optical fiber amplifier, the second erbium-doped optical fiber amplifier, the first optical fiber polarization controller and the second optical fiber polarization controller are respectively used for regulating and controlling the intensity of injected light and feedback light, and generated chaotic laser with multiple wavelengths, no time delay characteristic and spectrum broadening passes through the first optical isolator and the second and third 1 x 2 50:50 couplers and is divided into three beams of chaotic laser, wherein the first beam of chaotic laser is used as a light source for forward information transmission; the second beam of chaotic laser is divided into two paths through a second optical fiber and a fourth coupler, wherein one path is used for demodulating forward information, and the other path is used as a light source for transmitting reverse information; the third beam of chaotic laser is used for demodulating the reverse information, which is as follows:
the method comprises the following steps that firstly, a first bundle of chaotic lasers enters a first wavelength division multiplexer after passing through a second optical isolator to separate multi-wavelength chaotic lasers according to the wavelengths of sub-modes of a multi-longitudinal-mode semiconductor laser without the isolator, the obtained chaotic lasers with different wavelengths and spectral bandwidths are used as carriers, information with different speeds of the chaotic lasers in each path is simultaneously loaded by a first information encoder according to the width of the frequency spectrum of the chaotic lasers in each wavelength, the chaotic lasers in each wavelength are combined into one bundle by the second wavelength division multiplexer, and the bundle reaches a third wavelength division multiplexer of a receiving end after being transmitted by a first optical fiber; the third wavelength division multiplexer divides the multi-wavelength chaotic laser carrying information according to the wavelength of each sub-mode of the multi-longitudinal mode semiconductor laser without the isolator to obtain a plurality of chaotic lasers, and the optical signals are converted into electric signals through the first photoelectric detector.
After the second beam of chaotic laser passes through the second optical fiber and the fourth optical coupler, one path of chaotic laser enters a receiving end through the third optical isolator and then passes through the fourth wavelength division multiplexer and the second photoelectric detector to obtain an electric signal; the first information decoder is used for carrying out subtraction processing on the two electric signals, so that information loaded by the transmitting terminal at different rates can be extracted, and the safe and confidential transmission of the forward multi-path information at different rates is realized; the second beam of chaotic laser passes through a light source for reverse information transmission of another path of chaotic laser obtained by a second optical fiber and a fourth coupler, enters a fifth wavelength division multiplexer after passing through a fourth optical isolator to separate the multi-wavelength chaotic laser according to the wavelength of each sub-mode of the multi-longitudinal mode semiconductor laser without the isolator, the obtained chaotic laser with different wavelengths and spectral bandwidths is used as a carrier, information with different rates of each path of chaotic laser is simultaneously loaded by a second information encoder according to the width of the frequency spectrum of each wavelength chaotic laser, and each wavelength chaotic laser is combined into one beam by a sixth wavelength division multiplexer and reaches a seventh wavelength division multiplexer of a receiving end after being transmitted by a third optical fiber; the seventh wavelength division multiplexer divides the multi-wavelength chaotic laser carrying information according to the wavelength of each sub-mode of the multi-longitudinal mode semiconductor laser without the isolator, and the obtained multi-channel chaotic laser converts an optical signal into an electric signal through a third photoelectric detector;
third beam of chaotic laser enters a receiving end through a fifth optical isolator and a fourth optical fiber to realize the demodulation of reverse information, and is converted into an electric signal through an eighth wavelength division multiplexer and a fourth photoelectric detector; the two electric signals are subjected to subtraction processing by using a second information decoder, so that information loaded by the transmitting terminal at different rates can be extracted, and the secure and secret transmission of the information with different reverse multi-path rates is realized.
The working principle of the invention comprises:
1. the isolator-free multi-longitudinal mode semiconductor laser can generate chaotic laser with multiple wavelengths matched with longitudinal modes of the isolator-free multi-longitudinal mode semiconductor laser when the chaotic laser is fed back from a random grating, and because the random grating can generate a large number of random external cavity modes, the multi-wavelength chaotic laser has no external cavity time delay characteristic, namely the multi-wavelength (mode) chaotic laser has no time delay characteristic.
2. Under the laser injection of the tunable laser, the spectrum of the multi-wavelength chaotic laser without external cavity time delay characteristics can be broadened, and the ultra-wideband chaotic laser without the external cavity time delay characteristics matched with the injected laser wavelength can be generated. When the output wavelength of the wavelength tunable laser is adjusted to enable the output wavelength of the wavelength tunable laser to have frequency detuning quantity of 15GHz-30GHz with the wavelength of one mode in the isolator-free multi-longitudinal-mode laser, beat frequency of injected light and chaotic laser can be caused, further chaotic laser frequency spectrum in the mode is excited to be widened to 25GHz-40GHz, and the frequency spectrum bandwidth of the chaotic laser with different wavelengths corresponding to other modes can be maintained at 5GHz-8 GHz. The application requires that the frequency detuning quantity of one mode of single-mode laser and multi-longitudinal-mode laser emitted by the wavelength tunable laser is 25GHz-40 GHz. In order to fully utilize the wide spectrum characteristic of the chaotic laser, the information loading rate can be selected according to the frequency spectrum bandwidth of the chaotic laser, and the invention requires that the information loading rate of each information encoder is less than the frequency spectrum bandwidth for bearing the chaotic laser used by the information encoder.
3. The beam of chaotic laser with multiple wavelengths and without external cavity time delay characteristics is divided into three paths through two couplers to form two closed loops, wherein one closed loop can realize forward multi-path information loading, transmitting and demodulating, and the other closed loop is used for realizing reverse multi-path information loading, transmitting and demodulating. In order to realize information demodulation, the invention requires that the length of the information transmission optical fiber is consistent with that of the optical fiber entering the information receiving end, namely the length of the forward information transmission optical fiber is consistent with that of the optical fiber entering the information receiving end in the forward direction, namely the length of the first optical fiber is equal to that of the second optical fiber. Because the structure is two closed loop structures, namely the chaotic laser used for transmitting and demodulating the forward direction and the chaotic laser sent to the reverse receiving end share one optical fiber (second optical fiber), in addition, information is transmitted to a communication party through a third optical fiber with the length equal to that of the first optical fiber and the second optical fiber during reverse communication, the chaotic laser used for information demodulation needs to pass through a section of fourth optical fiber with the length 2 times that of the information transmission optical fiber (third optical fiber) before entering the reverse receiving end, so that the demodulation of reverse transmission information is realized.
Compared with the prior art, the invention has the following beneficial effects: compared with the prior art, the bidirectional multi-channel chaotic laser communication system and the communication method provided by the invention not only realize the simultaneous transmission of multi-channel information, but also can generate chaotic laser with the frequency spectrum bandwidth larger than 25GHz for loading high-speed information, and have bidirectional communication capability, and the advantages and positive effects are centrally embodied as follows:
firstly, the multi-wavelength chaotic laser without the time delay characteristic enhances the safety of information transmission. The generated multi-wavelength chaotic laser has different spectrum widths (the maximum spectrum bandwidth can reach 40 GHz), so that the requirements of different information transmission rates can be met, the difficulty of stealing information by an eavesdropper is increased due to the different information transmission rates, and the safety of information transmission is further ensured.
The invention uses multi-wavelength chaotic laser as carrier wave for transmitting information, does not depend on synchronous output of two chaotic lasers, constructs two closed loop structures to realize bidirectional multi-path information secret transmission, and effectively promotes the practical process of chaotic laser secret communication.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
The figures are labeled as follows: in the figure, 1-single-mode wavelength tunable semiconductor laser with isolator, 2-first erbium-doped fiber amplifier, 3-first fiber polarization controller, 4-first 1 x 250 coupler, 5-isolator-free multi-longitudinal-mode semiconductor laser, 6-first optical circulator, 7-second erbium-doped fiber amplifier, 8-second fiber polarization controller, 9-second optical circulator, 10-random grating, 11-first optical isolator, 12-second 1 x 250 coupler, 13-third 1 x 250 coupler, 14-second optical isolator, 15-first wavelength division multiplexer, 16-first information encoder, 17-second wavelength division multiplexer, 18-first fiber, 19-third wavelength division multiplexer, 20-a first photodetector, 21-a first information decoder, 22-a second photodetector, 23-a fourth wavelength division multiplexer, 24-a third optical isolator, 25-a fourth 1 x 2 50:50 coupler, 26-a second optical fiber, 27-a fourth optical isolator, 28-a fifth wavelength division multiplexer, 29-a second information encoder, 30-a sixth wavelength division multiplexer, 31-a third optical fiber, 32-a seventh wavelength division multiplexer, 33-a third photodetector, 34-a second information decoder, 35-a fourth photodetector, 36-an eighth wavelength division multiplexer, 37-a fourth optical fiber, 38-a fifth optical isolator.
Detailed Description
The present invention is further illustrated by the following specific examples.
A bidirectional multi-path chaotic laser communication system is shown in figure 1 and comprises a light injection part generated by ultra-wideband chaotic laser, a multi-wavelength chaotic laser generation part without time delay characteristic, a forward multi-path information loading, transmitting and demodulating part and a reverse multi-path information loading, transmitting and demodulating part;
the light injection part generated by the ultra-wideband chaotic laser comprises a single-mode band isolator wavelength tunable semiconductor laser 1, the output end of the single-mode band isolator wavelength tunable semiconductor laser 1 is connected with the input end of a first erbium-doped fiber amplifier 2, the output end of the first erbium-doped fiber amplifier 2 is connected with the input end of a first optical fiber polarization controller 3, the output end of the first optical fiber polarization controller 3 is connected with the first input end of a first 1 x 2 50:50 coupler 4, and the output end of the first 1 x 2 50:50 coupler 4 is connected with the first port of a first optical circulator 6;
the multi-wavelength chaotic laser generating part without time delay characteristics comprises a multi-longitudinal-mode semiconductor laser 5 without an isolator, the output end of the isolator-free multi-longitudinal-mode semiconductor laser 5 is connected with the second port of the first optical circulator 6, the third port of the first optical circulator 6 is connected with the input end of the second erbium-doped fiber amplifier 7, the output end of the second erbium-doped fiber amplifier 7 is connected with the input end of the first optical fiber polarization controller 8, the output end of the first optical fiber polarization controller 8 is connected with the first port of the second optical circulator 9, the second port of the second optical circulator 9 is connected with the input end of the random grating 10, the third port of the second optical circulator 9 is connected with the second input end of the first 1 x 2 50:50 coupler 4, the output end of the random grating 10 is connected with the input end of the first optical isolator 11, and the output end of the first optical isolator 11 is connected with the input end of the second 1 x 2 50:50 coupler 12;
the forward multi-path information loading, transmitting and demodulating part comprises a third 1X 2 50:50 coupler 13, a first output end of a second 1X 2 50:50 coupler 12 is connected with an input end of the third 1X 2 50:50 coupler 13, a first output end of the third 1X 2 50:50 coupler 13 is connected with an input end of a second optical isolator 14, an output end of the second optical isolator 14 is connected with an input end of a first wavelength division multiplexer 15, an output end of the first wavelength division multiplexer 15 is connected with an input end of a first information encoder 16, an output end of the first information encoder 16 is connected with an input end of a second wavelength division multiplexer 17, an output end of the second wavelength division multiplexer 17 is connected with an input end of a first optical fiber 18, an output end of the first optical fiber 18 is connected with an input end of a third wavelength division multiplexer 19, an output end of the third wavelength division multiplexer 19 is connected with an input end of a first photoelectric detector 20, an output end of the first photoelectric detector 20 is connected with an input end of a first, the output end of the first information decoder 21 is connected with the input end of the second photoelectric detector 22, the second output end of the third 1X 2 50:50 coupler 13 is connected with the input end of the second optical fiber 26, the output end of the second optical fiber 26 is connected with the input end of the fourth 1X 2 50:50 coupler 25, the first output end of the fourth 1X 2 50:50 coupler 25 is connected with the input end of the third optical isolator 24, the output end of the third optical isolator 24 is connected with the input end of the fourth wavelength division multiplexer 23, and the output end of the fourth wavelength division multiplexer 23 is connected with the input end of the second photoelectric detector 22;
the reverse multi-path information loading, transmitting and demodulating part comprises a fourth optical isolator 27, the second output end of a fourth 1X 2 50:50 coupler 25 is connected with the input end of the fourth optical isolator 27, the output end of the fourth optical isolator 27 is connected with the input end of a fifth wavelength division multiplexer 28, the output end of the fifth wavelength division multiplexer 28 is connected with the input end of a second information encoder 29, the output end of the second information encoder 29 is connected with the input end of a sixth wavelength division multiplexer 30, the output end of the sixth wavelength division multiplexer 30 is connected with the input end of a third optical fiber 31, the output end of the third optical fiber 31 is connected with the input end of a seventh wavelength division multiplexer 32, the output end of the seventh wavelength division multiplexer 32 is connected with the input end of a third photoelectric detector 33, the output end of the third photoelectric detector 33 is connected with the input end of a second information decoder 34, the input end of the second information decoder 34 is connected with, the second output end of the second 1 × 2 50:50 coupler 12 is connected to the input end of a fifth optical isolator 38, the output end of the fifth optical isolator 38 is connected to the input end of a fourth optical fiber 37, the output end of the fourth optical fiber 37 is connected to the input end of an eighth wavelength division multiplexer 36, and the output end of the eighth wavelength division multiplexer 36 is connected to the input end of a fourth photodetector 35.
In the embodiment, the frequency detuning amount of 15GHz-30GHz exists between the output wavelength of the single-mode wavelength tunable semiconductor laser 1 with the isolator and the wavelength of one mode in the multi-longitudinal-mode semiconductor laser 5 without the isolator by adjusting; the rate of loading information by each information encoder is less than the frequency spectrum bandwidth of the chaotic laser used for bearing the information; the lengths of the first, second and third optical fibers 18, 26, 31 are equal and are half the length of the fourth optical fiber 37.
The communication method of the bidirectional multipath chaotic laser communication system of the embodiment specifically comprises the following steps: the isolator-free multi-longitudinal-mode semiconductor laser 5 receives two beams of light through a first optical circulator 6, wherein one beam of light is injected from a single-mode isolator wavelength-tunable semiconductor laser 1, and the other beam of light is feedback light from a random grating 10 and is used for generating multi-wavelength chaotic laser without time delay characteristics and spectrum broadening; the first erbium-doped optical fiber amplifier 2, the second erbium-doped optical fiber amplifier 7, the first optical fiber polarization controller 3 and the second optical fiber polarization controller 8 are respectively used for regulating and controlling the intensity of injected light and feedback light, and generated multi-wavelength, non-delay characteristic and spectrum-broadening chaotic laser is divided into three beams of chaotic laser through the first optical isolator 11 and the second 1 x 2 50:50 couplers 12 and 13, wherein the first beam of chaotic laser is used as a light source for forward information transmission; the second beam of chaotic laser is divided into two paths through a second optical fiber 26 and a fourth 1X 2 50:50 coupler 25, wherein one path is used for demodulating forward information, and the other path is used as a light source for transmitting reverse information; the third beam of chaotic laser is used for demodulating reverse information;
a first bundle of chaotic lasers enters a first wavelength division multiplexer 15 after passing through a second optical isolator 14 to separate multi-wavelength chaotic lasers according to the wavelengths of sub-modes of an isolator-free multi-longitudinal mode semiconductor laser 5, the obtained chaotic lasers with different wavelengths and spectral bandwidths are used as carriers, information with different rates of the chaotic lasers in each path is simultaneously loaded by a first information encoder 16 according to the width of the frequency spectrum of the chaotic lasers in each wavelength, and the chaotic lasers in each wavelength are combined into one bundle by a second wavelength division multiplexer 17 and transmitted by a first optical fiber 18 to reach a third wavelength division multiplexer 19 at a receiving end; the third wavelength division multiplexer 19 divides the multi-wavelength chaotic laser carrying information according to the wavelength of each sub-mode of the isolator-free multi-longitudinal mode semiconductor laser 5, and the obtained multi-wavelength chaotic laser converts an optical signal into an electrical signal through the first photodetector 20.
After the second beam of chaotic laser passes through a second optical fiber 26 and a fourth 1 multiplied by 2 50:50 coupler 25, one path of chaotic laser enters a receiving end through a third optical isolator 24 and then passes through a fourth wavelength division multiplexer 23 and a second photoelectric detector 22 to obtain an electric signal; the first information decoder 21 is used for carrying out subtraction processing on the two electric signals, so that information loaded by a transmitting terminal at different rates can be extracted, and the safe and confidential transmission of forward multi-path information at different rates is realized; the second bundle of chaotic lasers passes through a second optical fiber 26 and a fourth 1 x 2 50:50 coupler 25 to obtain another bundle of chaotic lasers which are used as a light source for reverse information transmission, the other bundle of chaotic lasers pass through a fourth optical isolator 27 and then enter a fifth wavelength division multiplexer 28 to separate the multi-wavelength chaotic lasers according to the wavelengths of sub-modes of the isolator-free multi-longitudinal-mode semiconductor laser 5, the obtained chaotic lasers with different wavelengths and spectral bandwidths are used as carriers, the chaotic lasers with different rates are simultaneously loaded to the information of the chaotic lasers by using a second information encoder 29 according to the widths of the frequency spectrums of the chaotic lasers, the chaotic lasers with different wavelengths are combined into one bundle by a sixth wavelength division multiplexer 30, and the bundle of chaotic lasers is transmitted by a third optical fiber 31 and then reaches a seventh wavelength division multiplexer 32 at a receiving end; the seventh wavelength division multiplexer 32 divides the multi-wavelength chaotic laser carrying information according to the wavelength of each sub-mode of the isolator-free multi-longitudinal mode semiconductor laser 5, and the obtained multi-channel chaotic laser converts an optical signal into an electrical signal through the third photodetector 33.
Thirdly, in order to realize the demodulation of the reverse information, the third beam of chaotic laser enters a receiving end through a fifth optical isolator 38 and a fourth optical fiber 37 and is converted into an electric signal through an eighth wavelength division multiplexer 36 and a fourth photoelectric detector 35; the two electrical signals are subtracted by the second information decoder 34, so that the information with different rates loaded by the transmitting terminal can be extracted, and the secure and secret transmission of the information with different reverse multi-path rates is realized.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and principle of the invention should be included in the scope of the invention.
Claims (5)
1. A bidirectional multi-path chaotic laser communication system is characterized in that: the ultra-wideband chaotic laser device comprises a light injection part generated by ultra-wideband chaotic laser, a multi-wavelength chaotic laser generation part without time delay characteristic, a forward multi-channel information loading transmission demodulation part and a reverse multi-channel information loading transmission demodulation part;
the ultra-wideband chaotic laser generated light injection part comprises a single-mode band isolator wavelength tunable semiconductor laser (1), the output end of the single-mode band isolator wavelength tunable semiconductor laser (1) is connected with the input end of a first erbium-doped fiber amplifier (2), the output end of the first erbium-doped fiber amplifier (2) is connected with the input end of a first fiber polarization controller (3), the output end of the first fiber polarization controller (3) is connected with the first input end of a first 1 x 2 50:50 coupler (4), and the output end of the first 1 x 2 50:50 coupler (4) is connected with the first port of a first optical circulator (6);
the multi-wavelength chaotic laser generating part with the non-time-delay characteristic comprises a multi-longitudinal-mode semiconductor laser (5) without an isolator, the output end of the multi-longitudinal-mode semiconductor laser (5) without the isolator is connected with the second port of a first optical circulator (6), the third port of the first optical circulator (6) is connected with the input end of a second erbium-doped optical fiber amplifier (7), the output end of the second erbium-doped optical fiber amplifier (7) is connected with the input end of a first optical fiber polarization controller (8), the output end of the first optical fiber polarization controller (8) is connected with the first port of a second optical circulator (9), the second port of the second optical circulator (9) is connected with the input end of a random grating (10), the third port of the second optical circulator (9) is connected with the second input end of a first 1 x 2 50:50 coupler (4), the output end of the random grating (10) is connected with the input end of a first optical isolator (11), the output end of the first optical isolator (11) is connected with the input end of a second 1X 2 50:50 coupler (12);
the forward multi-path information loading, transmitting and demodulating part comprises a third 1X 2 50:50 coupler (13), wherein a first output end of a second 1X 2 50:50 coupler (12) is connected with an input end of the third 1X 2 50:50 coupler (13), a first output end of the third 1X 2 50:50 coupler (13) is connected with an input end of a second optical isolator (14), an output end of the second optical isolator (14) is connected with an input end of a first wavelength division multiplexer (15), an output end of the first wavelength division multiplexer (15) is connected with an input end of a first information encoder (16), an output end of the first information encoder (16) is connected with an input end of a second wavelength division multiplexer (17), an output end of the second wavelength division multiplexer (17) is connected with an input end of a first optical fiber (18), an output end of the first optical fiber (18) is connected with an input end of a third wavelength division multiplexer (19), the output end of the third wavelength division multiplexer (19) is connected with the input end of the first photoelectric detector (20), the output end of the first photoelectric detector (20) is connected with the input end of the first information decoder (21), and the input end of the first information decoder (21) is connected with the output end of the second photoelectric detector (22); the second output end of the third 1X 2 50:50 coupler (13) is connected with the input end of a second optical fiber (26), the output end of the second optical fiber (26) is connected with the input end of a fourth 1X 2 50:50 coupler (25), the first output end of the fourth 1X 2 50:50 coupler (25) is connected with the input end of a third optical isolator (24), the output end of the third optical isolator (24) is connected with the input end of a fourth wavelength division multiplexer (23), and the output end of the fourth wavelength division multiplexer (23) is connected with the input end of a second photoelectric detector (22);
the reverse multi-path information loading, transmitting and demodulating part comprises a fourth optical isolator (27), the second output end of a fourth 1X 2 50:50 coupler (25) is connected with the input end of the fourth optical isolator (27), the output end of the fourth optical isolator (27) is connected with the input end of a fifth wavelength division multiplexer (28), the output end of the fifth wavelength division multiplexer (28) is connected with the input end of a second information encoder (29), the output end of the second information encoder (29) is connected with the input end of a sixth wavelength division multiplexer (30), the output end of the sixth wavelength division multiplexer (30) is connected with the input end of a third optical fiber (31), the output end of the third optical fiber (31) is connected with the input end of a seventh wavelength division multiplexer (32), the output end of the seventh wavelength division multiplexer (32) is connected with the input end of a third photoelectric detector (33), the output end of the third photoelectric detector (33) is connected with the input end of a second information decoder (34), the input end of a second information decoder (34) is connected with the output end of a fourth photoelectric detector (35), the second output end of a second 1X 2 50:50 coupler (12) is connected with the input end of a fifth optical isolator (38), the output end of the fifth optical isolator (38) is connected with the input end of a fourth optical fiber (37), the output end of the fourth optical fiber (37) is connected with the input end of an eighth wavelength division multiplexer (36), and the output end of the eighth wavelength division multiplexer (36) is connected with the input end of the fourth photoelectric detector (35).
2. The bidirectional multipath chaotic laser communication system according to claim 1, characterized in that: the output wavelength of the single-mode band-isolator wavelength tunable semiconductor laser (1) and the wavelength of one mode in the isolator-free multi-longitudinal-mode semiconductor laser (5) are adjusted to have frequency detuning quantity of 15GHz-30 GHz.
3. The bidirectional multipath chaotic laser communication system according to claim 1, characterized in that: the rate of loading information by each information encoder is less than the frequency spectrum bandwidth of the chaotic laser used for bearing the information.
4. The bidirectional multipath chaotic laser communication system according to claim 1, characterized in that: the first, second and third optical fibers (18, 26, 31) are equal in length and are half the length of the fourth optical fiber (37).
5. The communication method of the bidirectional multipath chaotic laser communication system according to claim 1, characterized in that: the isolator-free multi-longitudinal-mode semiconductor laser (5) receives two beams of light through a first optical circulator (6), wherein one beam of light is injected from a single-mode isolator-wavelength tunable semiconductor laser (1), and the other beam of light is feedback light from a random grating (10) and is used for generating multi-wavelength chaotic laser without time delay characteristics and spectrum broadening; the first erbium-doped optical fiber amplifier (2) and the second erbium-doped optical fiber amplifier (7) as well as the first optical fiber polarization controller (3) and the second optical fiber polarization controller (8) are respectively used for regulating and controlling the intensity of injected light and feedback light, and generated multi-wavelength, non-delay characteristic and spectrum-broadening chaotic laser is divided into three beams of chaotic laser through the first optical isolator (11) and the second 1 x 2 50:50 couplers (12, 13), wherein the first beam of chaotic laser is used as a light source for forward information transmission; the second beam of chaotic laser is divided into two paths through a second optical fiber (26) and a fourth 1 multiplied by 2 50:50 coupler (25), wherein one path is used for demodulating forward information, and the other path is used as a light source for transmitting reverse information; the third beam of chaotic laser is used for demodulating reverse information;
firstly, a first bundle of chaotic lasers enters a first wavelength division multiplexer (15) after passing through a second optical isolator (14) to separate multi-wavelength chaotic lasers according to the wavelength of each sub-mode of an isolator-free multi-longitudinal mode semiconductor laser (5), the obtained chaotic lasers with different wavelengths and spectral bandwidths are used as carriers, information with different rates of each path of chaotic lasers is simultaneously loaded by a first information encoder (16) according to the width of each wavelength chaotic laser spectrum, and then each wavelength chaotic laser is combined into one bundle by a second wavelength division multiplexer (17) and reaches a third wavelength division multiplexer (19) of a receiving end after being transmitted by a first optical fiber (18); the third wavelength division multiplexer (19) divides the multi-wavelength chaotic laser carrying information according to the wavelength of each sub-mode of the multi-longitudinal mode semiconductor laser without an isolator (5) to obtain a plurality of chaotic lasers, and the optical signals are converted into electric signals through the first photoelectric detector (20);
a second beam of chaotic laser is divided into two paths after passing through a second optical fiber (26) and a fourth 1 multiplied by 2 50:50 coupler (25), wherein one path of chaotic laser enters a receiving end through a third optical isolator (24) and then passes through a fourth wavelength division multiplexer (23) and a second photoelectric detector (22) to obtain an electric signal; the first information decoder (21) is used for carrying out subtraction processing on the electric signal converted by the first photoelectric detector (20) and the electric signal converted by the second photoelectric detector (22), so that information with different rates loaded by a transmitting end can be extracted, and the safe and confidential transmission of forward multi-path different information with different rates is realized; the second bundle of chaotic lasers pass through a second optical fiber (26) and a fourth 1 x 2 50:50 coupler (25) to obtain another path of chaotic lasers which are used as a light source for reverse information transmission, the other path of chaotic lasers pass through a fourth optical isolator (27) and then enter a fifth wavelength division multiplexer (28) to separate multi-wavelength chaotic lasers according to the wavelengths of all sub-modes of the isolator-free multi-longitudinal-mode semiconductor laser (5), the obtained chaotic lasers with different wavelengths and spectral bandwidths are used as carriers, the chaotic lasers with different speeds are simultaneously loaded to all paths of chaotic lasers by a second information encoder (29) according to the width of the frequency spectrum of all wavelength chaotic lasers, all wavelength chaotic lasers are combined into one bundle by a sixth wavelength division multiplexer (30), and the bundle of chaotic lasers are transmitted by a third optical fiber (31) and then reach a seventh wavelength division multiplexer (32) of a receiving end; the seventh wavelength division multiplexer (32) divides the multi-wavelength chaotic laser carrying information according to the wavelength of each sub-mode of the isolator-free multi-longitudinal mode semiconductor laser (5), and the obtained multi-channel chaotic laser converts an optical signal into an electric signal through a third photoelectric detector (33);
thirdly, in order to realize the demodulation of reverse information, the third beam of chaotic laser enters a receiving end through a fifth optical isolator (38) and a fourth optical fiber (37) and is converted into an electric signal through an eighth wavelength division multiplexer (36) and a fourth photoelectric detector (35); the electrical signal converted by the third photoelectric detector (33) and the electrical signal converted by the fourth photoelectric detector (35) are subjected to subtraction processing by using a second information decoder (34), so that information with different rates loaded by a transmitting end can be extracted, and the safe and confidential transmission of different information with reverse multi-path rates is realized.
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