Coherent light sensing integration technology based on phase encryption security enhancement

Abstract

The invention provides a coherent light sensing integration technology based on phase encryption security enhancement. The coherent light sensing integration technology mainly comprises a coherent light sending module, a signal encryption module, an optical fiber transmission and vibration module, a signal decryption module and a communication and sensing signal detection module. In the invention, optical chaos is generated in a DFB laser, and phase modulation is carried out by using the optical chaos and an unencrypted optical signal to realize chaos encryption. And after the encrypted signal is transmitted through an optical fiber and vibrated, the encrypted signal is subjected to phase decryption at a receiving end. The decrypted signals are firstly received by a coherent receiver and then acquired by a real-time oscilloscope, and finally, communication signals are demodulated by using a digital signal processing method, and phase information of vibration sensing signals is extracted.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical communication and optical fiber sensing, and more particularly, to a coherent optical communication and sensing integrated technology based on phase encryption security enhancement. BACKGROUND

[0002] As a core technology of the next generation of wireless communication, Integrated Sensing and Access (ISAC) realizes efficient coordination of data transmission and target sensing through sharing spectrum and multiplexing signals, which provides a foundation support for key scenarios such as intelligent transportation and low-altitude economy. However, the integration of communication and sensing functions also brings new security risks: traditional network layer encryption mechanisms are difficult to directly apply to physical layer signals, the sensing process may leak communication information, and the sensing data itself is also vulnerable to tampering during transmission. These security threats not only affect the reliability of communication, but also cause the distortion of sensing results, directly endangering the safe operation of ISAC. Therefore, building a physical layer security protection system that adapts to the integrated sensing and access system is an urgent need to promote the development of ISAC technology.

[0003] In the physical layer security technology, chaotic signals have become an important means to enhance communication security due to their characteristics of noise-like, high sensitivity to initial conditions, and wide spectrum. Unlike traditional algorithm encryption that relies on computational complexity, chaotic encryption enhances security from the physical nature of the signal, effectively resisting eavesdropping and analysis attacks, and providing a bottom-layer security solution for optical networks and other systems. In particular, chaotic lasers have been verified to effectively improve the security level of point-to-point secure communication.

[0004] Currently, mainstream ISAC systems often use coherent optical communication technology as the implementation basis. This technology uses the phase and amplitude dimensions of light waves for information modulation, with the advantages of high receiving sensitivity and large transmission capacity. A typical implementation scheme is to combine coherent optical communication and optical fiber sensing technology, and at the receiving end, through the same set of hardware and signal processing procedures, the communication baseband signal and the vibration phase information used for sensing are demodulated respectively, thereby efficiently realizing the integrated sensing and access function.

[0005] Although chaotic secure communication and coherent optical ISAC technology have made significant progress, how to deeply integrate chaotic encryption mechanisms into ISAC systems based on coherent optical architecture to build an integrated security solution that simultaneously safeguards communication data and sensing signal security and is compatible with existing high-speed optical networks is still a technical problem that needs to be broken through in the current field. Therefore, researching a new system that can enhance security and be well compatible with existing ISAC architecture has important academic value and practical significance. SUMMARY

[0006] The present application is directed to the above problems, proposes a kind of based on phase encryption security enhancement's coherent light pass and feel integrated technology, it is proposed to solve the security problem in existing pass and feel integrated system, improve the security of system by using chaotic signal.The technical scheme of the present application: a kind of based on phase encryption security enhancement's coherent light pass and feel integrated technology, it is characterized in that, including the following parts, coherent light sending module, signal encryption module, optical fiber transmission and vibration module, signal decryption module, communication and sensing signal detection module.

[0007] The coherent light sending module is characterized by mainly including an external cavity laser, a coherent light transmitter, a QPSK signal generator, an arbitrary waveform generator and an electric amplifier.

[0008] Further, the method of the coherent light sending module includes but is not limited to the following steps: at a legal communication transmitting end, 1a-the external cavity laser outputs as the optical input signal of 2a-the coherent light transmitter; after 5a-the QPSK signal generator generates a QPSK signal, the QPSK signal is output as an electric signal by 4a-the arbitrary waveform generator; the QPSK signal output by 4a-the arbitrary waveform generator is used as the electric input signal of 3a-the electric amplifier; and the QPSK signal amplified by 3a-the electric amplifier is used as the radio frequency signal of 2a-the coherent light transmitter.

[0009] The signal encryption module is characterized by mainly including a superluminescent laser diode, a tunable optical filter, an erbium-doped fiber amplifier, an optical coupler, an optical circulator, a DFB laser, a polarization controller, an optical attenuator, a photodetector, an electric amplifier and a phase modulator.

[0010] Further, the method of the signal encryption module includes but is not limited to the following steps: 1b-the superluminescent laser diode generates an optical signal, which is input into 2b-the tunable optical filter and 3b-the erbium-doped fiber amplifier; the optical signal is divided into two paths by 4b-the optical coupler; one of the two paths of the optical signal is input into 5b-the DFB laser through 8b-the optical attenuator, 7b-the polarization controller and 6b-the optical circulator to generate an optical chaotic signal; the optical chaotic signal is converted into an electric signal by 9b-the photodetector through the other end of 6b-the optical circulator; the chaotic electric signal is amplified by 10b-the electric amplifier and modulated onto the phase of the optical signal by 11b-the phase modulator to encrypt the transmitted optical signal.

[0011] The optical fiber transmission and vibration module is characterized by mainly comprising a wavelength division multiplexer, a single-mode optical fiber, a piezoelectric transducer, an optical fiber transmission link, a dispersion compensation optical fiber, an erbium-doped optical fiber amplifier, and a wavelength division demultiplexer.

[0012] Further, the implementation method of the optical fiber transmission and vibration module includes but is not limited to the following steps: the encrypted signal and another signal branched by the 4b-optical coupler are multiplexed on the 3c-single-mode optical fiber through the 1c-wavelength division multiplexer, the 2c-piezoelectric transducer makes vibration on the 3c-single-mode optical fiber, and then the power compensation is performed through the 4c-dispersion compensation optical fiber and the 5c-erbium-doped optical fiber amplifier, and the decomposition is performed by the 6c-wavelength division demultiplexer.

[0013] The signal decryption module is characterized by mainly comprising an optical circulator, a DFB laser, a polarization controller, an optical attenuator, an optical detector, an electrical amplifier, and a phase modulator; and the implementation technology includes chaos synchronization and phase decryption of a message.

[0014] Further, the implementation method of the signal decryption module includes but is not limited to the following steps: the decrypted signal after the decomposition of the 6c-wavelength division demultiplexer is used as the optical input signal of the 1d-phase modulator, another SLD signal after the decomposition is injected into the 5d-DFB laser through the 2d-optical attenuator, the 3d-polarization controller, and the 4d-optical circulator, and then the chaos signal is generated through chaos synchronization, the synchronized chaos signal is converted into an electrical signal through the 6d-optical detector after passing through the other end of the 4d-optical circulator, and the electrical chaos signal is amplified through the 7d-electrical amplifier and used as the radio frequency signal of the 1d-phase modulator, and the output is the decrypted signal.

[0015] The communication and sensing signal detection module is characterized by mainly comprising an external cavity laser, a coherent receiver, a real-time oscilloscope, and a digital signal processing module processor; and the implementation technology includes coherent demodulation and digital signal processing.

[0016] Further, the implementation method of the communication and sensing signal detection module includes but is not limited to the following steps: the decrypted signal and the eigenlight generated by the 2e-external cavity laser are mixed in the 1e-coherent receiver and subjected to coherent demodulation, then the signal is collected by the 3e-real-time oscilloscope, and finally the communication signal processing and vibration phase signal extraction are performed by the 4e-digital signal processing module processor.

[0017] The method of the present application firstly divides the light signal output by the superluminescent diode into two beams of light through a coupler, one of which is injected into a DFB laser to generate optical chaos, and the other is transmitted to the receiving end through an optical fiber through a wavelength division multiplexer. An external cavity laser is used to provide an optical carrier for the coherent light transmitter, and an arbitrary waveform generator is used to convert the mapped QPSK signal into an electrical signal, which is output as a coherent optical signal by the coherent transmitter. The optical chaos is used to modulate the phase of the unencrypted optical signal to achieve chaos encryption, which is phase encryption. Then the encrypted signal is transmitted to the receiving end through the optical fiber through the wavelength division multiplexer. A piezoelectric transducer of a fixed frequency is used to apply a vibration to the optical fiber on a single-mode optical fiber. At the receiving end, the de-multiplexed superluminescent diode output light signal is first injected into the DFB laser to achieve chaos synchronization, and then the encrypted signal is phase decrypted. The decrypted signal is first received by the coherent receiver, then collected by the real-time oscilloscope, and finally demodulated by the digital signal processing method to extract the phase information of the vibration sensing signal.

[0018] In summary, the coherent light communication and sensing integrated technology based on phase encryption security enhancement proposed by the present application can safely use the optical fiber communication and sensing system for information transmission and sensing perception by the sending and receiving parties. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A structure diagram of a coherent light communication and sensing integrated technology implementation device based on phase encryption security enhancement. DETAILED DESCRIPTION

[0020] The drawings are only used for illustrative description and cannot be understood as limiting the patent;

[0021] In order to better illustrate the present embodiment, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the actual size;

[0022] For those skilled in the art, it is understandable that some well-known content in the drawings may be omitted.

[0023] The technical solutions of the present application will be further described below in combination with the drawings and embodiments.

[0024] Embodiment

[0025] The coherent light communication and sensing integrated technology based on phase encryption security enhancement proposed by the present application mainly includes a coherent light sending part, a signal encryption part, an optical fiber transmission and vibration part, a signal decryption part, and a communication and sensing signal detection part.

[0026] The coherent light transmitting part includes but is not limited to: 1a-external cavity laser, 2a-coherent light transmitter, 5a-QPSK signal generator, 4a-arbitrary waveform generator, 3a-electric amplifier. The connection relationship of each module is as follows:

[0027] The output end of 1a-external cavity laser is connected with the input end of 2a-coherent light transmitter, the output end of 5a-QPSK signal generator is connected with the input end of 4a-arbitrary waveform generator, the output end of 4a-arbitrary waveform generator is connected with the input end of 3a-electric amplifier, and the output end of 3a-electric amplifier is connected with the input end of 2a-coherent light transmitter.

[0028] The signal encryption part includes but is not limited to: 1b-superluminescent diode, 2b-tunable optical filter, 3b-erbium-doped fiber amplifier, 4b-optical coupler, 6b-optical circulator, 5b-DFB laser, 7b-polarization controller, 8b-optical attenuator, 9b-optical detector, 10b-electric amplifier, 11b-phase modulator. The connection relationship of each module is as follows:

[0029] The output end of 1b-superluminescent diode is connected with the input end of 2b-tunable optical filter, the output end of 2b-tunable optical filter is connected with the input end of 3b-erbium-doped fiber amplifier, the output end of 3b-erbium-doped fiber amplifier is connected with the input end of 4b-optical coupler, the output end of 4b-optical coupler is connected with the input end of 8b-optical attenuator and 1c-wavelength division multiplexer respectively, the output end of 8b-optical attenuator is connected with the input end of 7b-polarization controller, the output end of 7b-polarization controller is connected with the input end of 6b-optical circulator, the input end of 6b-optical circulator is connected with the input end of 5b-DFB laser and the input end of 9b-optical detector respectively, the output end of 9b-optical detector is connected with the input end of 10b-electric amplifier, and the output end of 10b-electric amplifier is connected with the electric input end of 11b-phase modulator.

[0030] The fiber transmission and vibration part includes but is not limited to: 1c-wavelength division multiplexer, 2c-piezoelectric transducer, 3c-single mode fiber, 4c-dispersion compensation fiber, 5c-erbium-doped fiber amplifier, 6c-wavelength division demultiplexer. The connection relationship of each module is as follows:

[0031] The connection relationships of each module are as follows: the input of the 1c-wavelength division multiplexer is connected to the output of the 4b-optical coupler; the output of the 1c-wavelength division multiplexer is connected to the input of the 3c-single-mode fiber; the output of the 2c-piezoelectric transducer is coupled to the 3c-single-mode fiber to apply vibration; the output of the 3c-single-mode fiber is connected to the input of the 4c-dispersion compensation fiber; the output of the 4c-dispersion compensation fiber is connected to the input of the 5c-erbium-doped fiber amplifier; and the output of the 5c-erbium-doped fiber amplifier is connected to the input of the 6c-wavelength demultiplexer.

[0032] The signal decryption section includes, but is not limited to: 1d-phase modulator, 2d-optical attenuator, 3d-polarization controller, 4d-optical circulator, 5d-DFB laser, 6d-photodetector, and 7d-electrical amplifier. The connection relationships between these modules are as follows:

[0033] One output of the 6c-wave demultiplexer is connected to the optical input of the 1d-phase modulator, and its other output is connected to the input of the 2d-optical attenuator; the output of the 2d-optical attenuator is connected to the input of the 3d-polarization controller; the output of the 3d-polarization controller is connected to the first port of the 4d-optical circulator; the second port of the 4d-optical circulator is connected to the input of the 5d-DFB laser for injecting optical signals to achieve chaotic synchronization; the third port of the 4d-optical circulator is connected to the input of the 6d-photodetector; the output of the 6d-photodetector is connected to the input of the 7d-electric amplifier; and the output of the 7d-electric amplifier is connected to the RF input of the 1d-phase modulator.

[0034] The communication and sensing signal detection section includes, but is not limited to: 1e-coherent receiver, 2e-external cavity laser, 3e-real-time oscilloscope, and 4e-digital signal processing module processor. The connection relationships of each module are as follows:

[0035] The output of the 1d-phase modulator and the output of the 2e-external cavity laser are connected together to the input of the 1e-coherent receiver; the output of the 1e-coherent receiver is connected to the input of the 3e-real-time oscilloscope; and the output of the 3e-real-time oscilloscope is connected to the input of the 4e-digital signal processing module processor.

[0036] In summary, the coherent optical sensing integration technology based on phase encryption security enhancement proposed in this invention uses optical chaos to encrypt communication signals, enabling both the sender and receiver to securely transmit and sense information using optical fiber communication and sensing systems. This provides an effective physical layer security method for future ISAC systems.

[0037] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. The present application provides a kind of based on phase encryption security enhancement coherent light sensing integration technology, mainly by coherent light sending module, signal encryption module, optical fiber transmission and vibration module, signal decryption module and communication and sensing signal detection module composition.

2. The coherent optical transmitter module of claim 1, wherein the optical modulator is a Mach-Zehnder modulator. Including: An external cavity laser, a coherent transmitter, a QPSK signal generator, an arbitrary waveform generator, an electric amplifier; Realization technology includes: digital subcarrier multiplexing and QPSK signal mapping, polarization multiplexed QPSK signal generation.

3. The method of the coherent light sending module according to claim 2, the implementation method includes but is not limited to the following steps: in the legal communication transmitting end, 1a-external cavity laser output as 2a-coherent light transmitter optical input signal, 5a-QPSK signal generator generates QPSK signal, and then outputs as electric signal through 4a-arbitrary waveform generator, 4a-arbitrary waveform generator outputs QPSK signal as 3a-electric amplifier electric input signal, and the QPSK signal amplified by 3a-electric amplifier is as the radio frequency signal of 2a-coherent light transmitter.

4. The signal encryption module of claim 1, Its main features include: a superluminescent laser diode, a tunable optical filter, an erbium-doped fiber amplifier, an optical coupler, an optical circulator, a DFB laser, a polarization controller, an optical attenuator, a photodetector, an electric amplifier, a phase modulator;Realization technology includes: optical amplification and optical chaotic signal generation, introduction and extraction of optical signal in optical loop, phase encryption of message.

5. The signal encryption module according to claim 4, the implementation method includes but is not limited to the following steps: 1b-superluminescent laser diode generates optical signal, which passes through 2b-tunable optical filter and 3b-erbium-doped fiber amplifier, and is divided into two ways by 4b-optical coupler, one of which is injected into 5b-DFB laser to generate optical chaotic signal after passing through 8b-optical attenuator, 7b-polarization controller and 6b-optical circulator, the optical chaotic signal is converted into electric signal by 9b-photodetector after passing through the other end of 6b-circulator, and the chaotic electric signal is amplified by 10b-electric amplifier and modulated onto the phase of optical signal by 11b-phase modulator to encrypt the transmitted optical signal.

6. The fiber optic transmission and vibration module of claim 1, Its main features include: a wavelength division multiplexer, a single-mode optical fiber, a piezoelectric transducer, an optical fiber transmission link, a dispersion compensation optical fiber, an erbium-doped fiber amplifier, a wavelength division demultiplexer;Realization technology includes: signal transmission, vibration information generation.

7. The optical fiber transmission and vibration module according to claim 6, the implementation method includes but is not limited to the following steps: the other signal divided by 4b-optical coupler is multiplexed onto 3c-single-mode optical fiber by 1c-wavelength division multiplexer, 2c-piezoelectric transducer makes vibration on 3c-single-mode optical fiber, and then the signal is decomposed by 6c-wavelength division demultiplexer after power compensation by 4c-dispersion compensation optical fiber and 5c-erbium-doped fiber amplifier.

8. The signal decryption module of claim 1, The features mainly include: an optical circulator, a DFB laser, a polarization controller, an optical attenuator, an optical detector, an electrical amplifier, a phase modulator; the implementation techniques include: chaos synchronization, phase decryption of messages.

9. The signal encryption module according to claim 8, the implementation method of which includes but is not limited to the following steps: 6c- the encrypted signal after wavelength division demultiplexing is used as the optical input signal of 1d- the phase modulator, another demultiplexed SLD signal passes through 2d- the optical attenuator, 3d- the polarization controller and 4d- the optical circulator, and then is injected into 5d- the DFB laser to achieve chaos synchronization to generate a chaotic signal, the synchronized chaotic signal passes through the other end of 4d- the optical circulator, is photoelectrically converted by 6d- the optical detector, and then is amplified by 7d- the electrical amplifier to be used as the radio frequency signal of 1d- the phase modulator, and the output thereof is the decrypted signal.

10. The communication and sensing signal detection module of claim 1, wherein the main features are It includes: an external cavity laser, a coherent receiver, a real-time oscilloscope, a digital signal processing module processor; the implementation techniques include: coherent demodulation, digital signal processing.

11. The communication and sensing signal detection module according to claim 10, the implementation method of which includes but is not limited to the following steps: the decrypted signal is mixed with the eigenlight generated by 2e- the external cavity laser in 1e- the coherent receiver, is subjected to coherent demodulation, is subjected to signal acquisition by 3e- the real-time oscilloscope, and finally is subjected to communication signal processing and vibration phase signal extraction by using 4e- the digital signal processing module processor.

12. The phase-encryption security-enhanced coherent light-through-something integrated technology of claim 1, wherein After the chaotic signal is encrypted, the sender and the receiver can safely use the optical fiber communication and sensing system to transmit information and perform sensing.

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