CN114142933A - Secure communication device based on multi-core optical fiber and communication method thereof - Google Patents
Secure communication device based on multi-core optical fiber and communication method thereof Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/503—Laser transmitters
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/50—Transmitters
- H04B10/516—Details of coding or modulation
- H04B10/548—Phase or frequency modulation
- H04B10/556—Digital modulation, e.g. differential phase shift keying [DPSK] or frequency shift keying [FSK]
- H04B10/5561—Digital phase modulation
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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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Abstract
The invention belongs to the technical field of optical secret communication and optical signal processing, and discloses a secret communication device based on a multi-core optical fiber and a communication method thereof, wherein the secret communication device comprises a chaotic carrier generation module, an information encryption sending module, an optical fiber transmission link and a coherent demodulation receiving module; the output end of the chaotic carrier generation module is connected with the input end of the information encryption sending module, the output end of the information encryption sending module is connected with the input end of the optical fiber transmission link, and the output end of the optical fiber transmission link is connected with the input end of the coherent demodulation receiving module. The invention realizes the information covering by disturbing the optical carrier phase through the broadband chaotic signal. The local optical carrier channel is transmitted through the center core of the multi-core optical fiber, so that the safety problem of the traditional coherent secret communication is avoided, meanwhile, the capacity of the chaotic secret communication is improved based on the space division multiplexing technology of the multi-core optical fiber, and the safe and large-capacity information transmission can be realized through coherent detection.
Description
Technical Field
The invention belongs to the technical field of optical secret communication and optical signal processing, and particularly relates to a secret communication device based on a multi-core optical fiber and a communication method thereof.
Background
Currently, optical fiber communication is widely used in various fields due to its large communication capacity and long transmission distance. With the ever increasing capacity of networks, the security of optical networks is becoming more and more important. In the existing secure communication scheme, optical chaotic secure communication has received wide attention as a good solution for improving security. However, the rate of optical chaotic secure communication is still lower than the transmission rate of more than 100Gb/s of the traditional optical communication. Therefore, the communication rate expansion of the chaotic secret communication is imminent.
By a method for expanding the optical chaotic carrier bandwidth, the single-wave optical chaotic transmission rate is developed from 1Gb/s to 10 Gb/s. Further enhancement of the chaotic carrier bandwidth requires more complex devices and more expensive equipment. In addition, the following two common methods for improving the optical chaos secret communication rate are adopted, firstly, Wavelength Division Multiplexing (WDM) and other multiplexing methods in the traditional optical fiber communication are adopted, the wavelength division multiplexing can simultaneously transmit optical carriers with different wavelengths in an optical fiber, and each carrier can carry different information, so that the method can realize higher transmission rate and communication capacity. At present, 4 × 12.5Gb/s encrypted information transmission is realized by using wavelength division multiplexing, see documents j.lightwave Technol, vol.39, No.8, p.2288, 2021. And secondly, a high-order modulation method such as Quadrature Amplitude Modulation (QAM) is adopted. The high-order modulation format can improve the utilization rate of the frequency spectrum and fully use the frequency spectrum of the chaotic carrier. At present, 16QAM signal transmission of 32Gb/s is realized by a chaos secret communication scheme based on an OEO chaotic system, which is disclosed in the references Opt.Lett, Vol.44, No.23, P.5776, 2019. However, this scheme requires machine learning to assist in correctly recovering information at the receiving end, and its security is to be improved. Therefore, a scheme is proposed to solve the problem of sensitivity of a receiving end by adopting coherent detection, and a coherent secret communication scheme based on laser chaotic synchronization is simulated to realize 16QAM information transmission of 40Gb/s, which is disclosed in Opt.Lett, Vol.45, No.17, P.4762, 2020. However, the scheme needs to establish chaotic synchronization between the transmitting side and the receiving side, which limits the single wave rate of the transmitting side and the receiving side, so that the overall transmission rate is not greatly improved. Therefore, it is necessary to combine multiplexing technology such as space division multiplexing in conventional optical communication with coherent communication to realize large-capacity optical chaotic secret communication.
Through the above analysis, the problems and defects of the prior art are as follows:
(1) the existing secret communication mode based on the high-order modulation method needs machine learning to assist in correctly recovering information at a receiving party, and the safety of the existing secret communication mode needs to be improved.
(2) The existing secret communication mode needs to establish chaotic synchronization between a transmitting party and a receiving party, so that the single wave rate of the transmitting party and the receiving party is limited, and the overall transmission rate is not greatly improved.
The difficulty in solving the above problems and defects is:
the scheme based on machine learning has potential safety hazard, an attacker can decrypt ciphertext to decode information through large-scale calculation, and meanwhile, the introduction of machine learning means that more resources are needed to decrypt the information. Aiming at single-wave expansion, more information can be carried by using a broadband chaotic carrier, and at present, a plurality of schemes for enhancing chaotic bandwidth exist, but the schemes can obtain broadband chaotic signals only by introducing additional devices.
The significance of solving the problems and the defects is as follows:
if the chaotic synchronization is not needed at the receiving party, the decryption can be carried out only by grasping all the parameter keys, so that the bandwidth limitation of the chaotic synchronization can be avoided, and the transmission bandwidth of the chaotic secure communication is expanded.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a secure communication device based on a multi-core optical fiber and a communication method thereof.
The invention is realized in this way, a secret communication device based on multi-core optical fiber and its communication method includes:
the system comprises a chaotic carrier generation module, an information encryption sending module, an optical fiber transmission link and a coherent demodulation receiving module; the chaotic carrier generation module generates a broadband phase chaotic carrier, the information encryption transmission module modulates information onto the broadband chaotic carrier through a first IQ modulator to realize information hiding, the optical fiber transmission link couples multiple channels into a multi-core optical fiber for transmission and couples and outputs the multi-core optical fiber into a plurality of single-mode optical fibers, and the coherent demodulation receiving module decrypts an encrypted signal to obtain the information.
The output end of the chaotic carrier generation module is connected with the input end of the information encryption sending module, the output end of the information encryption sending module is connected with the input end of the optical fiber transmission link, and the output end of the optical fiber transmission link is connected with the input end of the coherent demodulation receiving module.
Further, the chaotic carrier generation module comprises a first laser, a first IQ modulator, a first optical amplifier, an optical attenuator, an optical detector, a power divider, a third radio frequency amplifier, a phase modulator and a second laser which are connected in sequence, and the phase modulator is connected with the information encryption transmission module.
Further, the first IQ modulator and the power divider are directly connected through a first radio frequency amplifier and a second radio frequency amplifier which are arranged in parallel.
Further, the information encryption sending module comprises a second optical amplifier and an optical coupler which are connected with each other, and the output end of the optical coupler is respectively connected with a second IQ modulator and a first optical adjustable delay line;
the other end of the second IQ modulator is connected with a first dispersion medium, the other end of the first optical adjustable delay line is connected with a polarization controller, and the first dispersion medium and the polarization controller are both connected with an optical fiber transmission link.
Further, the optical fiber transmission link comprises a fan-in coupler, a multi-core optical fiber and a fan-out coupler which are sequentially connected, and the fan-out coupler is connected with the coherent demodulation receiving module.
Further, coherent demodulation receiving module is including the second dispersion medium, the adjustable delay line of second light and the coherent receiver that connect gradually, interconnecting link between the adjustable delay line of second light and the coherent receiver is connected with third dispersion medium, second dispersion medium and third dispersion medium are connected with the optic fibre transmission link respectively.
Another object of the present invention is to provide a secure communication method based on a multi-core optical fiber, including:
firstly, light emitted by a first laser passes through a first IQ modulator, a first amplifier and an optical attenuator in sequence, is detected by an optical detector, is converted into an electric signal and is output to a power divider;
step two, the power divider divides the input electric signal into three beams of electric signals, wherein two beams of electric signals are respectively amplified by the first radio frequency amplifier and the second radio frequency amplifier and then output to the output end of the first IQ modulator, and the other beam of electric signal is output to the phase modulator after passing through the third radio frequency amplifier, so that the closing of the whole loop is completed, and the oscillation of the loop generates chaotic signals;
step three, outputting the light output by the second laser to a phase modulator, modulating the electric signal input by the third radio frequency amplifier to the optical signal output by the second laser by the phase modulator, and outputting the optical signal to a second optical amplifier;
after amplifying the input optical signal, the second optical amplifier divides the amplified optical signal into two beams of light through the optical coupler, and after IQ modulation is carried out on one beam of light through the second IQ modulator loaded with information, the beam of light is output to the first dispersion medium and then is output to the fan-in coupler; the other beam of light passes through the first light adjustable delay line and the polarization controller in sequence and then is output to the fan-in coupler;
coupling the input optical signals to the multi-core optical fiber by the fan-in coupler, transmitting the optical signals and outputting the optical signals to the fan-out coupler, and respectively coupling signals of a peripheral core and a central core of the multi-core optical fiber to the single-mode optical fiber by the fan-out coupler and outputting the signals to a second dispersive medium and a third dispersive medium;
and step six, outputting the optical signal output by the second dispersive medium to a coherent receiver after passing through a second optical adjustable delay line, outputting the optical signal output by the third dispersive medium to the coherent receiver, detecting the input optical signal by the coherent receiver and converting the input optical signal into an electric signal to be output, wherein the electric signal is the loading information after being subjected to QAM mapping.
By combining all the technical schemes, the invention has the advantages and positive effects that:
the invention provides a coherent secret communication transmission scheme based on a multi-core optical fiber, which is used for disturbing the phase of an optical carrier through a broadband chaotic signal to realize the information masking. The local optical carrier channel is transmitted through the center core of the multi-core optical fiber, so that the safety problem of the traditional coherent secret communication is avoided, meanwhile, the capacity of the chaotic secret communication is improved based on the space division multiplexing technology of the multi-core optical fiber, and the safe and large-capacity information transmission can be realized through coherent detection.
Compared with the traditional optical communication direct alignment detection scheme, the method adopts the coherent optical communication detection technology, improves the carrier frequency spectrum utilization rate, and can realize information transmission with higher speed and capacity.
Compared with the traditional chaotic secret communication scheme, the invention only changes the light source of the transmitter in the traditional coherent receiver, and other devices are not changed, so that the invention can be well compatible with the existing coherent optical communication network.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed to be used in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and it is obvious for those skilled in the art that other drawings can be obtained from the drawings without creative efforts.
Fig. 1 is a block diagram of a secure communication apparatus based on a multi-core optical fiber according to an embodiment of the present invention.
In the figure: 11. a first laser; 12. a first IQ modulator; 13. a first optical amplifier; 14. an optical attenuator; 15. a light detector; 16. a power divider; 17. a first radio frequency amplifier; 18. a second radio frequency amplifier; 19. a third radio frequency amplifier; 110. a second laser; 111. a phase modulator; 21. a second optical amplifier; 22. an optical coupler; 23. a second IQ modulator; 24. a first dispersion medium; 25. a first optically tunable delay line; 26. a polarization controller; 31. a fan-in coupler; 32. a multi-core optical fiber; 33. a fan-out coupler; 41. a second dispersion medium; 42. a second optically tunable delay line; 43. a third dispersive medium; 44. a coherent receiver.
Fig. 2 is a cross-sectional view of a multi-core optical fiber provided by an embodiment of the present invention.
Fig. 3 is a constellation diagram of a sender, a constellation diagram of a legal receiver, a constellation diagram of an illegal attacker, a spectrum of the legal receiver, and a spectrum of the illegal attacker, which are provided by the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to solve the problems in the prior art, the present invention provides a secure communication device based on a multi-core optical fiber and a communication method thereof, and the present invention is described in detail below with reference to the accompanying drawings.
As shown in fig. 1, the apparatus of the present invention includes a first laser 11, a first IQ modulator 12, a first optical amplifier 13, an optical attenuator 14, an optical detector 15, a power divider 16, a first radio frequency amplifier 17, a second radio frequency amplifier 18, a third radio frequency amplifier 19, a second laser 110, a phase modulator 111, a second optical amplifier 21, an optical coupler 22, a second IQ modulator 23, a first dispersion medium 24, a first optically tunable delay line 25, a polarization controller 26, a fan-in coupler 31, a multi-core optical fiber 32, a fan-out coupler 33, a second dispersion medium 41, a third dispersion medium 43, a second optically tunable delay line 42, and a coherent receiver 44.
In the embodiment of the present invention, the first laser 11, the first IQ modulator 12, the first optical amplifier 13, the optical attenuator 14, the optical detector 15, the power divider 16, the first radio frequency amplifier 17, and the second radio frequency amplifier 18 form a closed loop, and generate a broadband chaotic signal.
The light output by the second laser 110 in the embodiment of the present invention is input into the phase modulator 111, and the phase modulator 111 phase-modulates the broadband chaotic electric signal input by the third radio frequency amplifier 19 onto the light, so that the light output by the phase modulator is a phase chaotic optical carrier that is scrambled in phase by the broadband chaotic signal. The phase-chaotic light carrier is sequentially output to the second optical amplifier 21 and the optical coupler 22, and then is divided into two beams, wherein one beam of light is sequentially output to the information-modulated second IQ modulator 23 and the first dispersion medium 24, and then is output to the optical fiber transmission link, which is called as signal light. The other beam of light is output to the first optical tunable delay line 25 and the polarization controller 26 in turn and then output to the optical fiber transmission link, which is called local light.
Signal light and local light in the embodiment of the present invention are input to the fan-in coupler 31 and coupled into the multi-core optical fiber 32, wherein the signal light is coupled to the peripheral core and the local light is coupled to the central core. After transmission through the multi-core fiber, the signal light and the local light are output to the fan-out coupler 33, and are respectively coupled to the single-mode fiber, and then output to the coherent demodulation receiving module.
The signal light in the embodiment of the present invention is output to the second dispersion medium 41 and the second light adjustable delay line 42 in sequence, and then output to the coherent receiver 44; the local light is output to the third dispersive medium and then to the coherent receiver 44. The coherent receiver 44 detects the signal light and the local light and converts the signal light and the local light into an electrical signal, and the transmission information is obtained after the electrical signal is processed by an algorithm.
The working principle of the embodiment of the invention is as follows:
1) chaotic carrier generation
The first laser 11, the first IQ modulator 12, the first optical amplifier 13, the optical attenuator 14, the optical detector 15, the power divider 16, the first radio frequency amplifier 17, and the second radio frequency amplifier 18 form a closed loop, and the IQ modulator can realize the logic function of an exclusive nor (XNOR) by adjusting the bias voltage of the IQ modulator, so that the closed loop forms a delay feedback nonlinear loop and can generate a broadband chaotic signal. Further, the generated broadband chaotic electric signal is amplified by the third radio frequency amplifier 19 and then output to the phase modulator 111, and the phase modulator 111 modulates the input electric signal to the light output by the second laser 110, so as to obtain the phase chaotic optical carrier.
2) Information encrypted transmission
The phase chaotic light carrier is divided into two beams after passing through a second optical amplifier 21 and an optical coupler 22, wherein one beam is output to a second IQ modulator 23 for information loading and then output to a first dispersion medium 24 for covering, and the signal is called as first signal light; the other beam passes through the first light adjustable delay line 25 and the polarization controller 26 in sequence and is output, which is called as a first local light. Wherein the first dispersion medium 24 and the first optically tunable delay line 25 serve as a communication key.
3) Optical fiber transmission
The first signal light and the first local light are coupled into the multi-core fiber 32 after being fanned into the coupler 31, wherein the first signal light is transmitted in a peripheral core of the multi-core fiber, the first local light is transmitted in a central core of the multi-core fiber, then the multi-core fiber is output to the fanout coupler 33, signals transmitted in different cores are respectively coupled into different single-mode fibers, similarly, the light coupled out from the central core is called as second local light, and the light coupled out from the peripheral core is called as second signal light.
As shown in fig. 2, the signal light is coupled to the cores No.1, 2, 3, 4, 5, and 6 of the multi-core fiber for transmission, and the local light is coupled to the core No. 7 of the multi-core fiber for transmission.
4) Information demodulation
The second signal light sequentially passes through a second dispersion medium 41 and a second light adjustable delay line 42, compensates for optical fiber transmission dispersion and matches two paths of delay difference, and then is output to a coherent receiver 44. The second local light is output to the third dispersive medium 43 and then to the coherent receiver 44. The coherent receiver 44 detects the input optical signal and converts the optical signal into an electrical signal for output, and then obtains information after algorithm demodulation.
The experimental device corresponding to the figure 1 is set up, and the obtained experimental data are shown in figure 3
As can be seen from fig. 3, only the legal receiver can correctly recover the constellation diagram to obtain the transmission information, but the constellation diagram obtained by the illegal aggressor is covered by the chaotic signal. Likewise, from the spectrum, it can be seen that the information of the illegal receiver is masked by the chaotic signal.
The technical solution of the present invention is further described below with reference to a secure communication method based on a multi-core optical fiber.
The invention also provides a secret communication method based on the multi-core optical fiber, which comprises the following steps:
firstly, light emitted by a first laser passes through a first IQ modulator, a first amplifier and an optical attenuator in sequence, is detected by an optical detector, is converted into an electric signal and is output to a power divider;
step two, the power divider divides the input electric signal into three beams of electric signals, wherein two beams of electric signals are respectively amplified by the first radio frequency amplifier and the second radio frequency amplifier and then output to the output end of the first IQ modulator, and the other beam of electric signal is output to the phase modulator after passing through the third radio frequency amplifier, so that the closing of the whole loop is completed, and the oscillation of the loop generates chaotic signals;
step three, outputting the light output by the second laser to a phase modulator, modulating the electric signal input by the third radio frequency amplifier to the optical signal output by the second laser by the phase modulator, and outputting the optical signal to a second optical amplifier;
after amplifying the input optical signal, the second optical amplifier divides the amplified optical signal into two beams of light through the optical coupler, and after IQ modulation is carried out on one beam of light through the second IQ modulator loaded with information, the beam of light is output to the first dispersion medium and then is output to the fan-in coupler; the other beam of light passes through the first light adjustable delay line and the polarization controller in sequence and then is output to the fan-in coupler;
coupling the input optical signals to the multi-core optical fiber by the fan-in coupler, transmitting the optical signals and outputting the optical signals to the fan-out coupler, and respectively coupling signals of a peripheral core and a central core of the multi-core optical fiber to the single-mode optical fiber by the fan-out coupler and outputting the signals to a second dispersive medium and a third dispersive medium;
and step six, outputting the optical signal output by the second dispersive medium to a coherent receiver after passing through a second optical adjustable delay line, outputting the optical signal output by the third dispersive medium to the coherent receiver, detecting the input optical signal by the coherent receiver and converting the input optical signal into an electric signal to be output, wherein the electric signal is the loading information after being subjected to QAM mapping.
The above description is only for the purpose of illustrating the present invention and the appended claims are not to be construed as limiting the scope of the invention, which is intended to cover all modifications, equivalents and improvements that are within the spirit and scope of the invention as defined by the appended claims.
Claims (7)
1. A secure communication apparatus based on a multi-core optical fiber, the secure communication apparatus based on a multi-core optical fiber comprising:
the system comprises a chaotic carrier generation module, an information encryption sending module, an optical fiber transmission link and a coherent demodulation receiving module;
the output end of the chaotic carrier generation module is connected with the input end of the information encryption sending module, the output end of the information encryption sending module is connected with the input end of the optical fiber transmission link, and the output end of the optical fiber transmission link is connected with the input end of the coherent demodulation receiving module.
2. The secret communication device based on the multi-core optical fiber as claimed in claim 1, wherein the chaotic carrier generation module comprises a first laser, a first IQ modulator, a first optical amplifier, an optical attenuator, an optical detector, a power divider, a third rf amplifier, a phase modulator and a second laser which are connected in sequence, and the phase modulator is connected with the information encryption transmission module.
3. The secure communication apparatus based on multi-core optical fiber as claimed in claim 2, wherein the first IQ modulator and the power divider are directly connected through a first rf amplifier and a second rf amplifier arranged in parallel.
4. The secret communication device based on the multi-core optical fiber as claimed in claim 1, wherein the information encryption transmission module comprises a second optical amplifier and an optical coupler which are connected with each other, and the output end of the optical coupler is connected with a second IQ modulator and a first optical adjustable delay line respectively;
the other end of the second IQ modulator is connected with a first dispersion medium, the other end of the first optical adjustable delay line is connected with a polarization controller, and the first dispersion medium and the polarization controller are both connected with an optical fiber transmission link.
5. The secure communications device based on multiple-core optical fiber as claimed in claim 1, wherein the optical fiber transmission link comprises a fan-in coupler, multiple-core optical fiber and a fan-out coupler connected in sequence, and the fan-out coupler is connected with the coherent demodulation receiving module.
6. The secret communication device based on multi-core optical fiber as claimed in claim 1, wherein the coherent demodulation receiving module comprises a second dispersive medium, a second optically tunable delay line and a coherent receiver connected in sequence, a third dispersive medium is connected to a connection line between the second optically tunable delay line and the coherent receiver, and the second dispersive medium and the third dispersive medium are respectively connected to the optical fiber transmission link.
7. A secure communication method based on a multi-core optical fiber using the secure communication device based on a multi-core optical fiber according to any one of claims 1 to 6, wherein the secure communication method based on a multi-core optical fiber comprises:
firstly, light emitted by a first laser passes through a first IQ modulator, a first amplifier and an optical attenuator in sequence, is detected by an optical detector, is converted into an electric signal and is output to a power divider;
step two, the power divider divides the input electric signal into three beams of electric signals, wherein two beams of electric signals are respectively amplified by the first radio frequency amplifier and the second radio frequency amplifier and then output to the output end of the first IQ modulator, and the other beam of electric signal is output to the phase modulator after passing through the third radio frequency amplifier, so that the closing of the whole loop is completed, and the oscillation of the loop generates chaotic signals;
step three, outputting the light output by the second laser to a phase modulator, modulating the electric signal input by the third radio frequency amplifier to the optical signal output by the second laser by the phase modulator, and outputting the optical signal to a second optical amplifier;
after amplifying the input optical signal, the second optical amplifier divides the amplified optical signal into two beams of light through the optical coupler, and after IQ modulation is carried out on one beam of light through the second IQ modulator loaded with information, the beam of light is output to the first dispersion medium and then is output to the fan-in coupler; the other beam of light passes through the first light adjustable delay line and the polarization controller in sequence and then is output to the fan-in coupler;
coupling the input optical signals to the multi-core optical fiber by the fan-in coupler, transmitting the optical signals and outputting the optical signals to the fan-out coupler, and respectively coupling signals of a peripheral core and a central core of the multi-core optical fiber to the single-mode optical fiber by the fan-out coupler and outputting the signals to a second dispersive medium and a third dispersive medium;
and step six, outputting the optical signal output by the second dispersive medium to a coherent receiver after passing through a second optical adjustable delay line, outputting the optical signal output by the third dispersive medium to the coherent receiver, detecting the input optical signal by the coherent receiver and converting the input optical signal into an electric signal to be output, wherein the electric signal is the loading information after being subjected to QAM mapping.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116647285A (en) * | 2023-07-24 | 2023-08-25 | 之江实验室 | Signal encryption and decryption system and method and communication system |
| CN116647285B (en) * | 2023-07-24 | 2023-10-10 | 之江实验室 | Signal encryption and decryption system and method and communication system |
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| CN114142933B (en) | 2023-04-25 |
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