CN111953471B - Secret communication system based on chaos coherent modulation - Google Patents
Secret communication system based on chaos coherent modulation Download PDFInfo
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- CN111953471B CN111953471B CN202010685317.9A CN202010685317A CN111953471B CN 111953471 B CN111953471 B CN 111953471B CN 202010685317 A CN202010685317 A CN 202010685317A CN 111953471 B CN111953471 B CN 111953471B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L9/00—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols
- H04L9/001—Cryptographic mechanisms or cryptographic arrangements for secret or secure communications; Network security protocols using chaotic signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/001—Modulated-carrier systems using chaotic signals
Abstract
The invention belongs to the technical field of secret communication, and discloses a secret communication system based on chaotic coherent modulation, which comprises a driving light source, a first coupler, a first response laser and a first photoelectric detector, wherein the driving light source is connected with the first coupler; a first continuous light laser; a Mach-Zehnder modulator; an I/Q modulation device; the system comprises a first wavelength division multiplexer, a long-distance optical fiber link, a second wavelength division multiplexer, a second response laser, a second coupler, a second photoelectric detector, a third photoelectric detector, a second continuous light laser, a 90-degree frequency mixer, a first balanced detector and a second balanced detector; the device comprises a first subtracter, a second subtracter and a parallel-serial conversion device. The invention realizes high-quality chaotic synchronization among the response lasers through common signal driving, and the driving lasers and the response lasers are not synchronous, and the synchronous chaotic signals exist as interference carriers of a transmitting end in the traditional IQ modulation communication scheme, thereby ensuring the safety of information in channel transmission.
Description
Technical Field
The invention belongs to the technical field of chaotic secret communication in the field of optical fiber communication, and particularly relates to a secret communication system based on chaotic coherent modulation.
Background
The chaotic optical communication has the advantages of hardware encryption, compatibility with the existing optical communication system, suitability for high-speed (Gbit/s) and long-distance (km) secret communication and the like, and is receiving wide attention. In 2005, field experiments based on chaotic communication of semiconductor lasers with an encrypted transmission rate of 1Gb/s were performed over a 120-km optical fiber link (Nature, Vol.438, P.343-346,2005.). In 2010 field experiments based on chaotic communication of Optical Electrical Oscillators (OEOs) achieved information transmission rates of 10 Gb/s over a link of more than 100 km (IEEE j. Quantum Electron, vol.46, p.1430, 2010). However, the rate of chaotic optical communication is still far lower than the transmission rate of the conventional coherent optical communication above 100 Gb/s. Therefore, one of the key problems of chaotic secure communication is to increase the chaotic optical communication rate.
There are two common methods for increasing the chaotic light communication rate. Firstly, the bandwidth of a chaotic carrier is improved, the bandwidth of a chaotic semiconductor laser is limited by relaxation frequency, and the chaotic bandwidth of the semiconductor laser can be improved to about 20GHz (Opt Express, Vol 23, P.1470, 2015.) (Opt Lett, Vol 34, P.1144, 2009.) through external light injection. Quadrature phase shift keying modulation using dual delay feedback (opt. Lett, vol. 36, p.2833, 2011.) in OEO systems also increases its chaotic bandwidth to 13 GHz. However, further enhancement of bandwidth requires complex system architectures or high-speed optoelectronic devices, thereby increasing the cost of the device and the difficulty of device integration. Another effective method for increasing the rate of chaotic communication is to use high-order modulation methods such as Quadrature Amplitude Modulation (QAM). Optical QAM in coherent optical communications enables higher modulation rates and greater capacity. At present, 30Gb/s encrypted information transmission (Opt. Lett, Vol.43, P.1323, 2018.) (Opt. Lett, Vol. 44, P.5776, 2019.) can be realized by using an intensity chaos masked intensity modulated duobinary signal and an electrical 16QAM signal of an OEO system. However, the above-mentioned OEO system uses only the intensity of the optical carrier and does not use the phase of the optical carrier, and the structure of the OEO system is complicated and expensive, which is not suitable for practical use and integration. The semiconductor laser has a simple structure and low cost, is the most common transceiver in the chaos secret communication research at present, but does not realize the secret communication of high-order modulation modes such as multidimensional optical QAM based on the strength and phase of the combined optical carrier, and the encryption rate of the semiconductor laser needs to be further improved. Therefore, it is necessary to find a scheme for improving the encryption rate and ensuring the security of the transmitted information by combining the semiconductor laser chaotic communication and the coherent optical communication.
Disclosure of Invention
The invention overcomes the defects of the prior art, and solves the technical problems that: the chaotic coherent modulation-based secret communication system can not only improve the information transmission rate of a chaotic secret communication scheme, but also ensure the safety of transmitted information.
In order to solve the technical problems, the invention adopts the technical scheme that: a secret communication system based on chaotic coherent modulation comprises a driving light source, a first coupler, a first response laser, a first photoelectric detector, a first continuous light laser, a Mach-Zehnder modulator, an I/Q modulation device, a first wavelength division multiplexer, a long-distance optical fiber link, a second wavelength division multiplexer, a second response laser, a second coupler, a second photoelectric detector, a third photoelectric detector, a second continuous light laser, a 90-degree frequency mixer, a first balanced detector and a second balanced detector; the device comprises a first subtracter, a second subtracter and a parallel-serial conversion device;
the light output by the driving light source is divided into two beams through the first coupler, wherein one beam is injected into the first response laser, the other beam is injected into the second response laser after sequentially passing through the first wavelength division multiplexer, the long-distance optical fiber link and the second wavelength division multiplexer, and the driving light source is used for enabling the first response laser and the second response laser to output chaotic laser in a light injection mode; the output signal of the first response laser is detected by a first detector and then output to a Mach-Zehnder modulator to drive the Mach-Zehnder modulator; the output signal of the second response laser is divided into two beams of light by the second coupler and then is respectively detected by the second photoelectric detector and the third photoelectric detector;
the output signal of the first continuous light laser is input to the first input end of the 90-degree frequency mixer through the Mach-Zehnder modulator, the I/Q modulation device, the first wavelength division multiplexer, the long-distance optical fiber link and the second wavelength division multiplexer, the output signal of the second continuous light laser is connected with the second input end of the 90-degree frequency mixer, the output signals of the first output end and the third output end of the 90-degree frequency mixer are detected by the first balanced detector, and the output signals of the second output end and the fourth output end are detected by the second balanced detector; the output signal of the first balanced detector and the output signal of the second photoelectric detector are output to a first input end of the parallel-serial conversion device after passing through a first subtracter, and the output signal of the second balanced detector and the output signal of the third photoelectric detector are output to a second input end of the parallel-serial conversion device after passing through a second subtracter;
the I/Q modulation device is used for loading the secret information, and the parallel-serial conversion device is used for outputting the information.
The secret communication system based on chaotic coherent modulation further comprises a first optical circulator and a second optical circulator, wherein a first port of the first optical circulator is connected with the first coupler, a second port of the first optical circulator is connected with the first response laser, and a third port of the first optical circulator is connected with the first photoelectric detector; and a first port of the second optical circulator is connected with the second wavelength division multiplexer, a second port of the second optical circulator is connected with the first response laser, and a third port of the second optical circulator is connected with the second coupler.
The secret communication system based on chaotic coherent modulation further comprises a serial-parallel conversion device, wherein the serial-parallel conversion device is connected with the driving end of the I/Q modulation device and is used for performing serial-parallel conversion on secret information and outputting the secret information to the I/Q modulation device.
The driving light source is a chaotic laser or an ASE light source (amplified spontaneous emission light source).
The first response laser and the second response laser output light synchronously and asynchronously with the driving light source output light.
The spectrum of the light output by the driving light source covers the spectrum of the light output by the first response laser and the second response laser, and the spectrum of the laser output by the driving light source is not overlapped with the spectrum of the first continuous light laser.
The parameters of the first and second response lasers are kept consistent, and the parameters of the first and second continuous lasers are kept consistent.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention provides a secret communication system based on chaotic coherent modulation, which drives two response lasers at a sending end and a receiving end through the same driving light source, realizes the asynchronization of the driving laser and the response laser by utilizing common signal driving, and realizes high-quality chaotic synchronization between the response lasers. At a sending end, IQ modulated information is hidden in the synchronous chaotic signal, so that the safety of the information in channel transmission is ensured. The receiving end realizes the separation of the chaotic light carrier modulated by the IQ information and the continuous light carrier through coherent demodulation of a 90-degree mixer, and then obtains corresponding information through chaotic synchronous demodulation. In the present invention, both the amplitude and phase of the information are masked and decrypted by a 90 ° optical mixer. The invention not only avoids the safety problem of the traditional optical communication, but also solves the problem of limited chaotic secret communication rate, is well compatible with the traditional optical communication system, and can realize safe and high-speed information transmission.
2. Compared with the direct modulation and demodulation scheme of chaotic optical communication, the invention adopts the I/Q modulation scheme in coherent optical communication to load and demodulate information, and has higher achievable communication rate, stronger bandwidth utilization rate and higher spectrum efficiency.
3. Compared with the traditional optical communication, the chaotic signal is used as an interference carrier in information encryption and transmission, and the characteristics of wide band, large amplitude and noise-like of the chaotic signal are utilized, so that the safety of information transmission is improved.
Drawings
Fig. 1 is a schematic structural diagram of a secret communication system based on chaotic coherent modulation according to an embodiment of the present invention;
fig. 2 is a schematic diagram of the operation of the 90 ° hybrid according to the embodiment of the present invention.
In the figure: 1 is a driving light source; 2 is a first coupler; 3 is a first response laser; 4 is a first optical circulator; 5 is a first photodetector; 6 is a first continuous light laser; a Mach-Zehnder modulator (MZM) 7; 8 is an I/Q modulation device; 9 is a serial-to-parallel conversion device; 10 is a first wavelength division multiplexer; 11 is a second wavelength division multiplexer; 12 is a second continuous light laser; 13 is a 90 ° mixer; 14 is a first balanced detector; 15 is a second balanced detector; 16 is a subtracter; 17 is a subtracter; 18 is a parallel-serial conversion device; 19 is a second photodetector; 20 is a third photodetector; 21 is a second coupler; 22 is a second optical circulator; 23 is a second response laser and 24 is a long haul fiber link.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments; all other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1, the present embodiment provides a secret communication system based on chaotic coherent modulation, which includes a driving light source 1, a first coupler 2, a first response laser 3, a first optical circulator 4, a first photodetector 5, a first continuous light laser 6, a mach-zehnder modulator 7, an I/Q modulation device 8, a serial-parallel conversion device 9, a first wavelength division multiplexer 10, a long-distance optical fiber link 24, a second wavelength division multiplexer 11, a second response laser 23, a second optical circulator 22, a second coupler 21, a second photodetector 19, a third photodetector 20, a second continuous light laser 12, a 90 ° frequency mixer 13, a first balanced detector 14, and a second balanced detector 15; a first subtractor 16, a second subtractor 17 and a parallel-to-serial conversion means 18.
Light output by the driving light source 1 is divided into two beams through the first coupler 2, wherein one beam is injected into the first response laser 3 through the first optical circulator 4, the other beam is injected into the second response laser 23 after sequentially passing through the first wavelength division multiplexer 10, the long-distance optical fiber link 24, the second wavelength division multiplexer 11 and the second optical circulator 22, and the driving light source 1 enables the first response laser 3 and the second response laser 23 to output chaotic laser in a light injection mode; the optical signal output by the first response laser 3 is detected by the first optical circulator 4 and the first detector 5, converted into an electrical signal and output to the mach-zehnder modulator 7 to modulate the output light of the first continuous optical laser 6; an optical signal output by the second response laser 23 is split into two beams by the second optical circulator 22 and the second coupler 21, and then detected by the second photodetector 19 and the third photodetector 20, respectively.
Wherein, the optical signal output by the first continuous optical laser 6 is input to the first input end of the 90 ° frequency mixer 13 through the mach-zehnder modulator 7, the I/Q modulation device 8, the first wavelength division multiplexer 10, the long-distance optical fiber link 24 and the second wavelength division multiplexer 11, the output end of the second continuous optical laser 12 is connected with the second input end of the 90 ° frequency mixer 13, the output optical signals of the first output end a and the third output end c of the 90 ° frequency mixer 13 are detected by the first balanced detector 14, and the output signals of the second output end b and the fourth output end d are detected by the second balanced detector 15; the output electrical signal of the first balanced detector 14 and the output electrical signal of the second photodetector 19 are input to a first input terminal of the parallel-serial conversion device 18 through a first subtractor 16, and the output electrical signal of the second balanced detector 15 and the output electrical signal of the third photodetector 20 are input to a second input terminal of the parallel-serial conversion device 18 through a second subtractor 17; the I/Q modulation device 8 is used for loading the secret information, and the parallel-serial conversion device 18 is used for outputting the demodulated secret information.
FIG. 2 is a schematic diagram of a 90 ° hybrid 13 according to an embodiment of the present invention, signal E 1 Sum signal E 2 After passing through the 90 ° mixer 13, the four outputs are:
two paths of its output (i.e. E) a And E c ) The electric signal output by the first balanced detector 14 is chaotic encrypted in-phase component (I) information, and the other two paths (namely E) b And E d ) The electrical signal detected by the second balanced detector 15 is the orthogonal component (Q) information encrypted by chaos, and the I signal and the Q signal encrypted by chaos are subtracted from the output signals of the second photodetector 19 and the third photodetector 20 in the subtracter, respectively, so as to demodulate the I signal and the Q signal decrypted by chaos.
Further, as shown in fig. 1, in this embodiment, a first port of the first optical circulator 4 is connected to the first coupler 2, a second port is connected to the first response laser 3, and a third port is connected to the first photodetector 5; a first port of the second optical circulator 22 is connected to the second wavelength division multiplexer 11, a second port is connected to the second response laser 23, and a third port is connected to the second coupler 21. By using the optical circulator, the output light of the driving light source can be injected into the response laser, and the output light of the response laser can be output to the photoelectric detector.
Further, as shown in fig. 1, the secret communication system based on chaotic coherent modulation provided in this embodiment further includes a serial-to-parallel conversion device 9, where the serial-to-parallel conversion device 9 is connected to the driving end of the I/Q modulation device 8, and is configured to output original information to the I/Q modulation device 8 after serial-to-parallel conversion.
Specifically, in this embodiment, the driving light source 1 is a chaotic laser or an ASE light source, and the driving light source 1 is configured to drive the first response laser 3 and the second response laser 23, so that the first response laser 3 and the second response laser 23 output synchronized chaotic light, and meanwhile, the output light of the driving light source should be out of synchronization with the output light of the first response laser 3 and the second response laser 23. Specifically, synchronization in the present invention refers to: the correlation coefficient of the two beams is larger than 0.8, and if the correlation coefficient is smaller than 0.8, the two beams are considered to be asynchronous. By adjusting the injection power, the current of the response laser and the like, the aim of synchronizing the two response lasers and not synchronizing the two response lasers with the driving light source can be achieved. In this embodiment, the chaos light output by the first response laser 3 and the second response laser 23 in synchronization is not synchronized with the output light of the driving light source 1, so as to ensure the safety of the chaos light system, and an eavesdropper cannot copy the output light of the response laser through the output light of the driving light source.
In addition, in the present embodiment, the parameters of the first response laser 3 and the second response laser 23 should be kept consistent, and the parameters of the first continuous light laser 6 and the second continuous light laser 12 should also be kept consistent, specifically, the parameter keeping consistent in the present invention means that the chips of the two lasers are from the same wafer, and the central wavelength of the lasers are consistentP-IThe curve skew efficiency and the threshold current mismatch are both less than 2%. The spectrum of the laser output by the driving light source 1 needs to cover the spectrum of the response laser, so that the driving light source can drive the response lasers of the transmitting end and the receiving end, and the response lasers of the transmitting end and the receiving end are enabled to realize high-quality synchronization. The spectrum of the laser output by the driving light source 1 is not overlapped with the spectrum of the first continuous light laser 6, so that the chaotic carrier and the continuous light carrier are not mutually interfered, and further, stable high-quality synchronization among response lasers and good demodulation performance of information are ensured.
The working principle of the embodiment of the invention is as follows:
1) the chaotic synchronization optical path is driven together.
The output light of the driving light source 1 is divided into two paths through the first coupler 2, one path is input into the first response laser 3 through the first circulator 4, and the other path is input into the response laser 23 through the first wavelength division multiplexer 10, the long-distance optical fiber link 24, the second wavelength division multiplexer 11 and the second circulator 22. In the process, the first response laser 3 and the second response laser 23 driven by the driving light source 1 can realize synchronization through parameter adjustment, and simultaneously, the two response lasers are not synchronized with the driving light source 1. The above object can be achieved by adjusting parameters such as the injection intensity of light and frequency detuning. The first response laser 3 and the second response laser 23 have bandwidth enhancement under the injection of the driving light source 1, and can load information. The driving light source 1 is a chaotic laser or an ASE light source (amplified spontaneous emission light source).
2) And (4) loading information.
The chaotic optical signal output by the first response laser 3 at the transmitting end is converted into an electrical signal by the photoelectric detector 5 after passing through the circulator and then is input into a Mach-Zehnder modulator (MZM)7, the continuous optical carrier output by the first continuous optical laser 6 is modulated, the chaotic modulated optical signal is input into an I/Q modulation device 8 as a new carrier, and information is input into the I/Q modulation device 8 through a serial-parallel conversion device 9 and is loaded onto the chaotic modulated new optical carrier. The chaotic coherent modulated optical signal output by the I/Q modulation device 8 is transmitted to a receiving end through the first wavelength division multiplexer 10, the long-distance optical fiber link 24 and the second wavelength division multiplexer 11 to demodulate information.
3) And (5) information demodulation.
The optical signal which is received by the second wavelength division multiplexer 11 and is subjected to chaotic coherent modulation and the continuous optical carrier signal generated by the second continuous optical laser 12 are both input into the 90 ° frequency mixer 13, the optical signals output by the first output end a and the third output end c of the 90 ° frequency mixer and the optical signals output by the second output end b and the fourth output end d are respectively input into the first balanced detector 14 and the second balanced detector 15, and I, Q electric signals which are subjected to chaotic modulation and contain information are respectively obtained. The chaotic light signal output by the second response laser 23 is output by the second circulator 22, then is divided into two beams by the second coupler 21, and is respectively input into the second photodetector 19 and the third photodetector 20, the information component recovered by the electric signal output by the second photodetector 19 and the electric signal output by the first balanced detector 14 through the first subtractor 16, the information component recovered by the electric signal output by the third photodetector 20 and the information component recovered by the electric signal output by the second balanced detector 15 through the second subtractor 17 are jointly input into the parallel-serial conversion device 18, and the final information is demodulated.
In summary, the invention provides a secret communication system based on chaotic coherent modulation, two response lasers at a sending end and a receiving end are driven by the same driving light source, high-quality chaotic synchronization between the response lasers is realized by using common signal driving, and the driving and the response lasers are not synchronized. The synchronous chaotic signal exists as an interference carrier of a transmitting end in the traditional IQ modulation communication scheme, so that the safety of information in channel transmission is ensured. The receiving end realizes the separation of the chaotic light carrier modulated by IQ information and the continuous light carrier through coherent demodulation of a 90-degree mixer, and then corresponding information is obtained through chaotic synchronous demodulation. In the present invention, both the amplitude and phase of the information are masked and decrypted by a 90-degree optical mixer. The invention avoids the safety problem of the traditional optical communication through the chaotic coherent modulation, solves the problem of limited chaotic secret communication rate, is well compatible with the traditional optical communication, and can realize safe and high-speed information transmission.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (3)
1. A secret communication system based on chaotic coherent modulation is characterized by comprising a driving light source (1), a first coupler (2), a first response laser (3), a first photoelectric detector (5), a first continuous light laser (6), a Mach-Zehnder modulator (7), an I/Q modulation device (8), a first wavelength division multiplexer (10), a long-distance optical fiber link (24), a second wavelength division multiplexer (11), a second response laser (23), a second coupler (21), a second photoelectric detector (19), a third photoelectric detector (20), a second continuous light laser (12), a 90-degree frequency mixer (13), a first balance detector (14) and a second balance detector (15); a first subtractor (16), a second subtractor (17) and a parallel-to-serial conversion device (18);
light output by the driving light source (1) is divided into two beams through the first coupler (2), wherein one beam is injected into the first response laser (3), the other beam is injected into the second response laser (23) after sequentially passing through the first wavelength division multiplexer (10), the long-distance optical fiber link (24) and the second wavelength division multiplexer (11), and the driving light source (1) is used for enabling the first response laser (3) and the second response laser (23) to output chaotic laser in a light injection mode; the output signal of the first response laser (3) is detected by a first photoelectric detector (5) and then output to a Mach-Zehnder modulator (7) to be driven; the output signal of the second response laser (23) is divided into two beams of light by a second coupler (21), and then the two beams of light are respectively detected by a second photoelectric detector (19) and a third photoelectric detector (20);
the output signal of the first continuous light laser (6) is input to the first input end of a 90 DEG frequency mixer (13) through a Mach-Zehnder modulator (7), an I/Q modulation device (8), a first wavelength division multiplexer (10), a long-distance optical fiber link (24) and a second wavelength division multiplexer (11), the output signal of the second continuous light laser (12) is connected with the second input end of the 90 DEG frequency mixer (13), the output signals of the first output end and the third output end of the 90 DEG frequency mixer (13) are detected by a first balanced detector (14), and the output signals of the second output end and the fourth output end are detected by a second balanced detector (15); the output signal of the first balanced detector (14) and the output signal of the second photoelectric detector (19) are output to a first input end of a parallel-serial conversion device (18) after passing through a first subtracter (16), and the output signal of the second balanced detector (15) and the output signal of the third photoelectric detector (20) are output to a second input end of the parallel-serial conversion device (18) after passing through a second subtracter (17);
the I/Q modulation device (8) is used for loading the secret information, and the parallel-serial conversion device (18) is used for outputting the information;
the device also comprises a first optical circulator (4) and a second optical circulator (22), wherein a first port of the first optical circulator (4) is connected with the first coupler (2), a second port of the first optical circulator is connected with the first response laser (3), and a third port of the first optical circulator is connected with the first photoelectric detector (5); a first port of the second optical circulator (22) is connected with the second wavelength division multiplexer (11), a second port is connected with the second response laser (23), and a third port is connected with the second coupler (21);
the first response laser (3) and the second response laser (23) output light synchronously, and the first response laser and the second response laser output light are asynchronous with the driving light source (1);
the spectrum of the light output by the driving light source (1) covers the spectrum of the light output by the first response laser (3) and the second response laser (23), and the spectrum of the laser output by the driving light source (1) is not overlapped with the spectrum of the first continuous light laser (6);
the parameters of the first response laser (3) and the second response laser (23) are kept consistent, and the parameters of the first continuous light laser (6) and the second continuous light laser (12) are kept consistent.
2. A secret communication system based on chaotic coherent modulation according to claim 1, further comprising a serial-to-parallel conversion device (9), wherein the serial-to-parallel conversion device (9) is connected to the driving end of the I/Q modulation device (8) and is configured to output secret information to the I/Q modulation device (8) after serial-to-parallel conversion.
3. A chaotic coherent modulation based secret communication system according to claim 1, wherein the driving light source (1) is a chaotic laser or an ASE light source.
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