CN109547151B - TWDM-PON-based bidirectional chaotic secure communication system and communication method - Google Patents
TWDM-PON-based bidirectional chaotic secure communication system and communication method Download PDFInfo
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Abstract
The invention discloses a two-way chaotic secret communication system and a communication method based on TWDM-PON, which is characterized in that 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 light is divided into multiple paths through a multi-path optical splitter, the three paths are grouped into one group, and each group is connected with a forward multi-path information loading, transmitting and demodulating part and a reverse multi-path information loading, transmitting and demodulating part; the optical fiber is divided by a wavelength division multiplexer according to the wavelength of a longitudinal mode and used as a chaotic laser carrier of multi-path communication; the three lights in each group form two closed loop structures which are respectively used for realizing forward and reverse multi-path information loading, transmission and demodulation. The invention can realize the two-way secret communication of multiple users, and can load high-speed information, thereby greatly increasing the number of users and meeting the requirements of the users.
Description
Technical Field
The invention relates to the field of broadband chaotic laser communication, in particular to a bidirectional chaotic secret communication system and a communication method based on TWDM-PON (time and wavelength division multiplexing), 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.
Although dense wavelength division multiplexing (WDM-PON) can increase the bandwidth of users in a communication system, it is limited by the number of WDM wavelength channels, and still cannot meet the requirement of high-speed secure communication for a large number of users. Therefore, in order to greatly increase the number of subscribers, a communication system of dense wavelength division multiplexing (WDM-PON) needs to be improved to meet the demand of a large number of subscribers.
Disclosure of Invention
The invention provides a two-way chaotic secure communication system and a two-way chaotic secure communication method based on a TWDM-PON (wavelength division multiplexing-passive optical network), aiming at solving the problems that in the existing chaotic secure communication system, the bandwidth of a user can be improved by dense wavelength division multiplexing (WDM-PON), but the bandwidth is limited by the number of WDM wavelength channels, and the high-speed secure communication requirements of a large number of users at present can not be met.
The invention is realized by the following technical scheme: a two-way chaotic secret communication system based on TWDM-PON 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 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 light amplification device, the output end of the first light amplification device 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 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 optical amplifying device, the output end of the second optical amplifying device 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 third optical amplifying device;
the output end of the third optical amplification device is connected with the input end of a TDM-PON, the TDM-PON is a multi-path optical splitter and is provided with a plurality of output ends, every three adjacent output ends are used as a group to form N groups, and each group is connected with a forward multi-path information loading transmission demodulation part and a reverse multi-path information loading transmission demodulation part;
the forward multi-channel information loading, transmitting and demodulating part comprises a second optical isolator, wherein in the output end of the TDM-PON, the first output end of each group is connected with the input end of the 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 first information decoder, and; the second output end of each TDM-PON group is connected with the input end of a second optical fiber, the output end of the second optical fiber is connected with the input end of a second 1X 2 50:50 coupler, the first output end of the second 1X 2 50:50 coupler is connected with the input end of a third optical isolator, the output end of the third optical isolator is connected with the input end of a fourth wavelength division multiplexer, and the output end of the fourth wavelength division multiplexer is connected with the input end of a second photoelectric detector;
the reverse multi-path information loading, transmitting and demodulating part comprises a fourth optical isolator, a second 1X 2 50:50 coupler has a second output end connected with an input end of the fourth optical isolator, a fourth optical isolator output end connected with an input end of a fifth wavelength division multiplexer, a fifth wavelength division multiplexer output end connected with an input end of a second information encoder, a second information encoder output end connected with an input end of a sixth wavelength division multiplexer, a sixth wavelength division multiplexer output end connected with an input end of a third optical fiber, a third optical fiber output end connected with an input end of a seventh wavelength division multiplexer, a seventh wavelength division multiplexer output end connected with an input end of a third photoelectric detector, a third photoelectric detector output end connected with an input end of a second information decoder, a second information decoder input end connected with an output end of the fourth photoelectric detector, and a third output end of the TDM-PON connected with an input end of the fifth optical isolator, 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 two-way chaotic secure communication system based on the TWDM-PON comprises the following specific 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 optical amplifier, the second optical 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 the generated multi-wavelength chaotic laser without time delay characteristic and spectrum broadening passes through the first optical isolator, the third optical amplifier and the TDM-PON and is divided into a plurality of chaotic lasers in a group of three paths, wherein one chaotic laser in each group of three paths is used as a light source for forward information transmission; the second path of chaotic laser is divided into two paths through a second optical fiber and a second 1 multiplied by 2 50:50 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 chaotic laser is used for demodulating reverse information;
① the first path of chaotic laser enters a first wavelength division multiplexer after passing through a second 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 wavelength and spectrum bandwidth is used as a carrier, the chaotic laser is simultaneously loaded to information with different speed of each path of chaotic laser by a first information encoder according to the width of each wavelength chaotic laser spectrum, and then the chaotic laser with each wavelength is combined into one beam by the second wavelength division multiplexer and reaches a third wavelength division multiplexer of a receiving end after being transmitted by a first optical fiber;
② a second chaotic laser beam is divided into two paths through a second optical fiber and a second 1 x 2 50:50 coupler, wherein, the first chaotic laser beam enters a receiving end through a third optical isolator and then passes through a fourth wavelength division multiplexer and a second photoelectric detector to obtain an electric signal, a first information decoder is used for carrying out subtraction processing on the electric signal obtained by the first photoelectric detector and the electric signal obtained by the second photoelectric detector in the step ① to extract information with different rates loaded by a transmitting end and realize the safe and confidential transmission of forward multi-path speed different information;
③ for realizing reverse information demodulation, the third chaotic laser enters the receiving end via the fifth optical isolator and the fourth optical fiber and is converted into electric signals via the eighth wavelength division multiplexer and the fourth photodetector, and the electric signals obtained by the third photodetector and the electric signals obtained by the fourth photodetector are subtracted by the second information decoder, so that the information with different rates loaded by the transmitting end can be extracted, and the safe and confidential 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 invention 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 light is divided into multiple paths through a third optical amplifying device and a TDM-PON, the multiple paths of light adopt three paths and one group, the multiple paths of light are divided into multiple groups, and each group is connected with a forward multi-path information loading, transmitting and demodulating part and a reverse multi-path information loading, transmitting and demodulating part respectively; the group of chaotic lasers with multiple wavelengths and without external cavity time delay characteristics are divided into three paths through two couplers to form two closed loops, wherein one closed loop can realize forward multi-path information loading, transmission and demodulation, and the other closed loop is used for realizing reverse multi-path information loading, transmission and demodulation. 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 invention can not only realize the bidirectional secret communication of multiple users, but also load high-speed information. The advantages and positive effects are concentrated and 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.
In the communication system constructed by the invention, the TWDM-PON not only can greatly improve the number of users, but also can realize the secret communication among the users.
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 optical amplifier, 3-first optical fiber polarization controller, 4-first 1 x 2 50:50 coupler, 5-isolator-free multi-longitudinal mode semiconductor laser, 6-first optical circulator, 7-second optical amplifier, 8-second optical fiber polarization controller, 9-second optical circulator, 10-random grating, 11-first optical isolator, 12-third optical amplifier, 13-TDM-PON, 14-second optical isolator, 15-first wavelength division multiplexer, 16-first information encoder, 17-second wavelength division multiplexer, 18-first optical fiber, 19-third wavelength division multiplexer, 20-first photodetector, 21-first information decoder, 22-second photodetector, 23-fourth wavelength division multiplexer, 24-third optical isolator, 25-second 1 × 2 50:50 coupler, 26-second optical fiber, 27-fourth optical isolator, 28-fifth wavelength division multiplexer, 29-second information encoder, 30-sixth wavelength division multiplexer, 31-third optical fiber, 32-seventh wavelength division multiplexer, 33-third photodetector, 34-second information decoder, 35-fourth photodetector, 36-eighth wavelength division multiplexer, 37-fourth optical fiber, 38-fifth optical isolator.
Detailed Description
The present invention is further illustrated by the following specific examples.
A two-way chaotic secret communication system based on TWDM-PON (time and wavelength division multiplexing-passive optical network), as shown in figure 1, 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 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 light amplification device 2, the output end of the first light amplification device 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 optical amplifying device 7, the output end of the second optical amplifying device 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 third optical amplifying device 12;
the output end of the third optical amplifier 12 is connected to the input end of a TDM-PON13, the TDM-PON13 is a demultiplexer and has a plurality of output ends, every three adjacent output ends are used as a group to form N groups, and each group is connected to a forward multi-channel information loading/transmitting demodulation part and a reverse multi-channel information loading/transmitting demodulation part;
the forward multiplex information loading transmission demodulating part includes a second optical isolator 14, in the output of the TDM-PON13, the first output end of each group is connected with the input end of a second optical isolator 14, the output end of the second optical isolator 14 is connected with the input end of a first wavelength division multiplexer 15, the output end of the first wavelength division multiplexer 15 is connected with the input end of a first information encoder 16, the output end of the first information encoder 16 is connected with the input end of a second wavelength division multiplexer 17, the output end of the second wavelength division multiplexer 17 is connected with the input end of a first optical fiber 18, the output end of the first optical fiber 18 is connected with the 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 a first photoelectric detector 20, the output end of the first photoelectric detector 20 is connected with the input end of a first information decoder 21, and the input end of the first information decoder 21; a second output end of each group of the TDM-PON13 is connected with an input end of a second optical fiber 26, an output end of the second optical fiber 26 is connected with an input end of a second 1X 2 50:50 coupler 25, a first output end of the second 1X 2 50:50 coupler 25 is connected with an input end of a third optical isolator 24, an output end of the third optical isolator 24 is connected with an input end of a fourth wavelength division multiplexer 23, and an output end of the fourth wavelength division multiplexer 23 is connected with an 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 the second 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, a third output end of the TDM-PON13 is connected to an input end of a fifth optical isolator 38, an output end of the fifth optical isolator 38 is connected to an input end of a fourth optical fiber 37, an output end of the fourth optical fiber 37 is connected to an input end of an eighth wavelength division multiplexer 36, and an output end of the eighth wavelength division multiplexer 36 is connected to an 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 half the length of the fourth optical fiber 37; the TDM-PON13 adopts 32-path, 64-path or 128-path optical splitters, and in this embodiment, 64-path optical splitters are adopted, so that 21 groups are formed.
The communication method of the bidirectional chaotic secure communication system based on the TWDM-PON comprises the following specific 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 optical amplification device 2, the second optical amplification device 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, the generated multi-wavelength chaotic laser with no time delay characteristic and spectrum broadening passes through the first optical isolator 11, the third optical amplification device 12 and the TDM-PON13 and is divided into a plurality of chaotic lasers in a group of three paths, and one chaotic laser in each group of three paths is used as a light source for forward information transmission; the second path of chaotic laser is divided into two paths through a second optical fiber 26 and a second 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 chaotic laser is used for demodulating reverse information;
① the first path of chaotic laser enters a first wavelength division multiplexer 15 after passing through a second optical isolator 14 to separate the multi-wavelength chaotic laser according to the wavelength of each sub-mode of the multi-longitudinal mode semiconductor laser 5 without the isolator, the obtained chaotic laser with different wavelength and spectrum bandwidth is used as a carrier, the chaotic laser is simultaneously loaded to information with different speed of each path of chaotic laser by a first information encoder 16 according to the width of each wavelength chaotic laser spectrum, and then the chaotic laser with each wavelength is combined into one beam by a second wavelength division multiplexer 17 and reaches a third wavelength division multiplexer 19 at a receiving end after being transmitted by a first optical fiber 18;
② the second chaotic laser beam is divided into two paths through the second optical fiber 26 and the second 1 × 2 50:50 coupler 25, wherein, the one path of chaotic laser beam enters the receiving end through the third optical isolator 24 and then passes through the fourth wavelength division multiplexer 23 and the 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 obtained by the first photoelectric detector 20 and the electric signal obtained by the second photoelectric detector 22 in step ① to extract information with different rates loaded by the transmitting end, so as to realize safe and confidential transmission of different information of forward multi-path rates, the second chaotic laser beam is used as a light source for reverse information transmission through the second optical fiber 26 and the second 1 × 2 50:50 coupler 25, enters the fifth wavelength division multiplexer 28 after passing through the fourth optical isolator 27 to separate the multi-wavelength chaotic laser beam according to the wavelength of each multi-longitudinal mode semiconductor laser 5 without an isolator, the obtained chaotic laser beams with different wavelength and spectrum bandwidths are used as carrier waves, the chaotic laser beams with the second information spectrum 29 are simultaneously loaded to the sixth chaotic laser beam 29 according to the width of the multi-longitudinal mode semiconductor laser beam, and then the chaotic laser beams are combined into a seventh chaotic laser beam 32 carrying the chaotic laser beam, and then passes through the third optical multiplexer 32 to obtain a multi-wavelength chaotic laser beam without the chaotic laser beam with the chaotic laser beam 31 and then is combined with the chaotic laser beam 31 without the chaotic laser beam 32;
③ for realizing the demodulation of reverse information, the third chaos laser enters the receiving end through the fifth optical isolator 38 and the fourth optical fiber 37 and is converted into electric signal through the eighth wavelength division multiplexer 36 and the fourth photodetector 35, the electric signal obtained by the third photodetector 33 and the electric signal obtained by the fourth photodetector 35 are subtracted by the second information decoder 34, the information with different speed loaded by the transmitting end can be extracted, and the secure transmission of the information with different reverse multi-path speed 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 (6)
1. A two-way chaotic secret communication system based on TWDM-PON 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 light amplification device (2), the output end of the first light amplification device (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 with the time delay-free characteristic comprises an isolator-free multi-longitudinal mode semiconductor laser (5), the output end of the isolator-free multi-longitudinal mode semiconductor laser (5) 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 optical amplifying device (7), the output end of the second optical amplifying device (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), and 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 the third optical amplifying device (12);
the output end of the third optical amplification device (12) is connected with the input end of a TDM-PON (13), the TDM-PON (13) is a multi-path optical splitter and is provided with a plurality of output ends, every three adjacent output ends are used as a group to form N groups, and each group is connected with a forward multi-path information loading transmission demodulation part and a reverse multi-path information loading transmission demodulation part;
the forward multi-channel information loading, transmitting and demodulating part comprises a second optical isolator (14), in the output end of a TDM-PON (13), the first output end of each group is connected with the input end of the second optical isolator (14), the output end of the second optical isolator (14) is connected with the input end of a first wavelength division multiplexer (15), the output end of the first wavelength division multiplexer (15) is connected with the input end of a first information encoder (16), the output end of the first information encoder (16) is connected with the input end of a second wavelength division multiplexer (17), the output end of the second wavelength division multiplexer (17) is connected with the input end of a first optical fiber (18), the output end of the first optical fiber (18) is connected with the 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 a first photoelectric detector (20), the output end of the first photoelectric detector (20) is connected with the input end of a first information decoder (21, 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 each group of the TDM-PON (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 second 1 x 2 50:50 coupler (25), the first output end of the second 1 x 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 the second 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 third output end of the TDM-PON (13) 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 TWDM-PON based bidirectional chaotic secure communication system according to claim 1, wherein: 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 TWDM-PON based bidirectional chaotic secure communication system according to claim 1, wherein: 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 TWDM-PON based bidirectional chaotic secure communication system according to claim 1, wherein: 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 TWDM-PON based bidirectional chaotic secure communication system according to claim 1, wherein: the TDM-PON (13) adopts 32-path, 64-path or 128-path optical splitters.
6. The communication method of the two-way chaotic secure communication system based on the TWDM-PON as claimed in claim 1, wherein: 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 optical amplification device (2), the second optical amplification device (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, the generated multi-wavelength chaotic laser without time delay characteristic and spectrum broadening is divided into a plurality of chaotic lasers in a group of three paths through the first optical isolator (11), the third optical amplification device (12) and the TDM-PON (13), and one chaotic laser in each group of three paths is used as a light source for forward information transmission; the second path of chaotic laser is divided into two paths through a second optical fiber (26) and a second 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 chaotic laser is used for demodulating reverse information;
① the first path of chaotic laser enters a first wavelength division multiplexer (15) after passing through a second optical isolator (14) to separate the multi-wavelength chaotic laser according to the wavelength of each sub-mode of the multi-longitudinal mode semiconductor laser without an isolator (5), the obtained chaotic laser with different wavelengths and spectral bandwidths is used as a carrier, the chaotic laser is simultaneously loaded to information with different speeds of each path of chaotic laser by a first information encoder (16) according to the width of each wavelength chaotic laser spectrum, and then is combined into one beam by a second wavelength division multiplexer (17), and the beam reaches a third wavelength division multiplexer (19) of a receiving end after being transmitted by a first optical fiber (18);
② the second chaotic laser beam is divided into two paths through a second optical fiber (26) and a second 1 x 2 50:50 coupler (25), wherein the one path of chaotic laser beam enters a receiving end through a third optical isolator (24) and then obtains an electric signal through a fourth wavelength division multiplexer (23) and a second photodetector (22), a first information decoder (21) is used for carrying out subtraction processing on the electric signal obtained by the first photodetector (20) and the electric signal obtained by the second photodetector (22) in step ①, information with different rates loaded by a transmitting end can be extracted, and secure transmission of different information with forward multi-path rates is realized;
③ for realizing the demodulation of reverse information, the third chaos laser enters the receiving end through the fifth optical isolator (38) and the fourth optical fiber (37) and is converted into electric signal by the eighth wavelength division multiplexer (36) and the fourth photoelectric detector (35), the electric signal obtained by the third photoelectric detector (33) and the electric signal obtained by the fourth photoelectric detector (35) are subtracted by the second information decoder (34), the information with different speed loaded by the transmitting end can be extracted, and the safe and confidential transmission of the information with different reverse multiplex speed can be realized.
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