A method and device for all-optical fusion of terahertz and laser symbiotic communication

Abstract

The application discloses a kind of terahertz and laser symbiotic communication methods of all-optical fusion, it is related to space broadband communication technical field.In transmitting end, double sideband optical signal is generated using single light source in combination with photoelectric modulator, it is separated into two independent optical carrier by programmable optical filter, and parallel transmission is carried out by driving terahertz and laser link respectively.In receiving end, terahertz signal is reconstructed as optical baseband signal by all-optical down-conversion, and is coupled in optical domain with laser signal after beam correction and power stabilization, finally, unified demodulation is completed with a set of coherent optical transceiver and digital signal processing module.The application also discloses a kind of terahertz and laser symbiotic communication device of all-optical fusion, the application is realized by one source double load and all-optical combining mechanism Height reuse of bottom hardware, while greatly reducing system cost, effectively improve the spectral efficiency and system capacity under complex weather conditions.

Description

Technical Field

[0001] This invention relates to the field of space broadband communication technology, and in particular to a fully optical fusion terahertz and laser co-existing communication method and device. Background Technology

[0002] The next-generation integrated air-space-ground-sea network requires communication systems with larger transmission capacity and higher transmission rates. Space laser communication technology has the advantages of high communication rates and no spectrum limitations, but it is highly susceptible to the effects of complex weather channels such as rain, fog, and atmospheric turbulence, leading to communication interruptions. Terahertz communication, due to its longer wavelength, has a strong ability to penetrate rain, snow, clouds, and fog, and can perfectly complement laser communication in terms of channel characteristics.

[0003] However, existing terahertz and laser fusion communication systems are typically simple physical combinations of two independent transceiver devices, resulting in bulky systems and high costs. More importantly, traditional terahertz communication is limited by the bandwidth bottleneck of electronic components, suffers from high up-conversion and down-conversion losses, and struggles to achieve seamless integration with high-speed fiber optic networks. Therefore, there is an urgent need for a highly efficient communication architecture that can overcome electronic bottlenecks, simplify hardware structure, and achieve full optical domain fusion. Summary of the Invention

[0004] The technical problem to be solved by this invention is to overcome the shortcomings of the prior art and provide a fully optical fusion terahertz and laser co-communication method and device. Based on the terahertz all-optical up-conversion mechanism and dual subcarrier modulation technology, this invention realizes that a coherent optical transceiver can simultaneously drive two links, terahertz and laser. While reducing system complexity and cost, it achieves maximum capacity and high reliability transmission under complex weather conditions, effectively breaks through the bandwidth bottleneck of traditional electronic devices, avoids hardware redundancy, and achieves maximum capacity, high reliability transmission and efficient hardware reuse under complex weather conditions.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A fully optically integrated terahertz and laser co-existence communication method proposed according to the present invention includes:

[0007] At the transmitting end, the electrical baseband signal is modulated into an optical signal including dual subcarriers. The optical signal with dual subcarriers is separated into a first photon signal and a second optical signal by filtering. The first photon signal is upconverted into a terahertz signal and transmitted into free space. The second optical signal is amplified and transmitted into free space as a laser signal.

[0008] At the receiving end, terahertz signals and laser signals in free space are received. The received terahertz signals are downconverted into a first optical baseband signal using all-optical methods. The received laser signals are then subjected to beam correction and power stabilization to obtain a second optical baseband signal. The first and second optical baseband signals are combined and coherently detected and digitally processed to recover the original data.

[0009] As a further optimization of the all-optical fusion terahertz and laser co-existence communication method described in this invention, the first photon signal is up-converted to a terahertz signal, including:

[0010] The first photon signal is subjected to optical heterodyne beat frequency processing with a local oscillator optical carrier having a frequency difference to generate a tunable ultrawideband terahertz signal.

[0011] As a further optimization of the all-optical fusion terahertz and laser co-existence communication method described in this invention, the received terahertz signal is down-converted all-optically into a first optical baseband signal, including:

[0012] An ultra-high-speed terahertz electro-optic modulator is used to directly modulate the received terahertz signal onto the optical carrier, and an optical filter is used to filter out one of the optical sideband signals as the first optical baseband signal.

[0013] As a further optimization of the all-optical fusion terahertz and laser co-existence communication method described in this invention, beam correction and power stabilization processing are performed on the received laser signal, including:

[0014] The laser signal is beam-corrected by an optical fast-reflection mirror to compensate for power fading caused by atmospheric turbulence, and the corrected optical signal is sent to an erbium-doped fiber amplifier (APC-EDFA) with automatic power control to stabilize the output optical power.

[0015] As a further optimization of the all-optical fusion terahertz and laser co-existence communication method described in this invention, the dual-subcarrier optical signal has two operating modes:

[0016] Capacity maximization mode: Two subcarriers transmit different data and are demodulated independently;

[0017] High reliability mode: The two subcarriers transmit the same data, which is processed at the receiving end through diversity reception and cooperative merging techniques to resist the effects of atmospheric turbulence.

[0018] A fully optically integrated terahertz and laser co-existing communication device includes a coherent optical digital signal processing module, a coherent optical transceiver, a programmable optical filter, a photonic terahertz transceiver, a laser transceiver, and an optical combiner, wherein...

[0019] A coherent optical digital signal processing module, a coherent optical transceiver, and a programmable optical filter are connected in sequence. The programmable optical filter is connected to a photonic terahertz transceiver and a laser transceiver, respectively. The photonic terahertz transceiver and the laser transceiver are respectively connected to a combiner, which is then connected to the coherent optical transceiver.

[0020] Coherent optical digital signal processing module: The transmitting end of the coherent optical digital signal processing module receives the raw data, generates and outputs a dual subcarrier digital signal to the coherent optical transceiver; the receiving end of the coherent optical digital signal processing module receives the digital electrical signal from the coherent optical transceiver, performs end-to-end adaptive intelligent optimization and demodulation, and finally recovers and outputs the raw data.

[0021] Coherent optical transceiver: The transmitting end of the coherent optical transceiver receives the dual-subcarrier digital signal from the coherent optical digital signal processing module, performs digital-to-analog conversion and electro-optic modulation, generates and outputs an optical signal containing the dual subcarriers to the programmable optical filter; the receiving end of the coherent optical transceiver receives the combined optical baseband signal from the optical combiner, performs coherent detection, and outputs the generated digital electrical signal to the coherent optical digital signal processing module.

[0022] Programmable optical filter: The transmitting end of the programmable optical filter receives an optical signal containing dual subcarriers from a coherent optical transceiver, filters and separates it into a first optical signal and a second optical signal, and outputs the first optical signal and the second optical signal to a photonic terahertz transceiver and a laser transceiver, respectively.

[0023] Photonic terahertz transceiver: The transmitter of the photonic terahertz transceiver receives the first optical signal after it has been filtered and separated by a programmable optical filter, upconverts it by optical heterodyne beat frequency to generate a terahertz signal and transmits it into free space; the receiver of the photonic terahertz transceiver receives the terahertz signal from free space, converts it into a first optical baseband signal by all-optical downconversion technology and outputs it to an optical combiner.

[0024] Laser transceiver: The transmitting end of the laser transceiver receives the second optical signal, which has been filtered, separated, and amplified by a programmable optical filter, and transmits it into free space as a laser signal; the receiving end of the laser transceiver receives the laser signal from free space, performs tracking, beam correction, and power stabilization processing on it to obtain the second optical baseband signal, and outputs it to the optical combiner; the optical combiner is used to receive the first optical baseband signal from the photonic terahertz transceiver and the second optical baseband signal from the laser transceiver, combine the two signals into a combined optical baseband signal, and output it to the receiving end of the coherent optical transceiver.

[0025] As a further optimization of the all-optical fusion terahertz and laser co-existing communication device described in this invention, the photonic terahertz transceiver includes:

[0026] The transmitting end of the photonic terahertz transceiver is equipped with a first laser, a second laser, an optical coupler, and a terahertz antenna. The optical carriers output from the first laser and the second laser are coupled by the optical coupler and then subjected to optical heterodyne beat frequency by a photodetector to generate a tunable ultrawideband terahertz signal, which is then transmitted by the terahertz antenna.

[0027] The receiving end of the photonic terahertz transceiver is equipped with a terahertz electro-optic modulator and an optical filter. The terahertz electro-optic modulator is used to modulate the received terahertz signal onto the local optical carrier, and the optical filter is used to filter out the first optical baseband signal.

[0028] As a further optimization of the all-optical fusion terahertz and laser co-existing communication device described in this invention, the laser transceiver includes:

[0029] The transmitting end of the laser transceiver is equipped with an erbium-doped fiber amplifier (EDFA) and a camera tracking module. The EDFA amplifies the power of the second optical signal, which has been filtered and separated by a programmable optical filter, and outputs it to an optical antenna. The optical antenna shapes and transmits the amplified optical signal, outputting the amplified second optical signal as a laser signal into free space. The camera tracking module works with the optical antenna to align the receiving end of the laser transceiver.

[0030] The receiver end of the laser transceiver includes an optical antenna, a camera tracking module, an optical fast-reflecting mirror, and an erbium-doped fiber amplifier (APC-EDFA) with automatic power control. The optical antenna receives laser signals from free space. The camera tracking module captures, tracks, and initially aligns the laser signal received by the optical antenna and transmitted through the atmosphere, guiding the laser signal to the optical fast-reflecting mirror. The optical fast-reflecting mirror performs rapid beam correction on the received laser signal. The erbium-doped fiber amplifier amplifies the corrected laser signal and performs automatic power control to stabilize the output optical power, obtaining the second optical baseband signal.

[0031] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0032] This invention combines an all-optical up-conversion mechanism with dual-subcarrier modulation technology. On the one hand, through a single-source dual-carrier transmission mechanism and a wavelength-aligned, combiner-detection reception mechanism, a single coherent optical transceiver can simultaneously drive two heterogeneous links: terahertz and laser. This significantly simplifies the system architecture, achieves efficient reuse of the underlying hardware, and reduces system costs. On the other hand, by allocating independent data streams to the two subcarriers to construct non-redundant data channels, the available bandwidth of the heterogeneous links is fully utilized, enabling ultra-large capacity transmission with a single subcarrier bandwidth of no less than 25 GHz and a total system communication rate of no less than 200 Gbps. This effectively improves spectral efficiency and communication stability in multi-user access scenarios. Attached Figure Description

[0033] Figure 1 A flowchart of a terahertz and laser all-optical co-communication method for complex weather conditions;

[0034] Figure 2 This is a diagram illustrating the overall architecture of a terahertz and laser all-optical coexistence communication system.

[0035] Figure 3 This is a schematic diagram of the spectrum of dual-subcarrier modulation.

[0036] Figure 4 This is a block diagram of the internal structure of a photonic terahertz transceiver.

[0037] Figure 5 This is a block diagram of the internal structure of a laser transceiver. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] To facilitate understanding of the present invention, a more complete description will be given below with reference to the accompanying drawings. Preferred embodiments of the invention are shown in the drawings. However, the invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the invention.

[0040] Unless otherwise defined, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Where the terms “comprising,” “having,” and “including” are used in this invention, another component may be added unless explicitly limiting the terminology used.

[0041] One embodiment of this application provides a terahertz and laser all-optical co-existing communication system, and another embodiment provides an all-optical fusion terahertz and laser co-existing communication method and apparatus. (Combined with...) Figure 1 As shown, the method mainly includes the following steps:

[0042] A dual-subcarrier electrical baseband signal is generated and electro-optically modulated.

[0043] Specifically, the user's raw data to be transmitted is mapped in the digital domain into a dual-subcarrier electrical baseband signal containing two independent data streams. After digital-to-analog conversion, this signal drives an optoelectronic modulator to modulate the intensity or phase of a single center wavelength continuous optical carrier emitted by the main laser, thereby generating an optical signal containing an upper sideband and a lower sideband in the frequency domain.

[0044] The dual subcarrier optical signals are filtered and separated to obtain the first optical signal and the second optical signal.

[0045] Specifically, the modulated optical signal enters a programmable optical filter. Utilizing the filter's frequency selectivity, the center carrier of the optical signal is suppressed, and its upper and lower sidebands are physically separated. One separated sideband serves as the first photonic signal (assigned to the terahertz link), and the other separated sideband serves as the second optical signal (assigned to the laser link), thus achieving the generation of a single-source dual-carrier optical signal.

[0046] The first photon signal is upconverted into a terahertz wave, and the power of the second optical signal is amplified and emitted into free space.

[0047] Specifically, for a terahertz link, the first photon signal beats the local oscillator light with a preset frequency difference to generate an ultra-wideband terahertz wave, which is then transmitted into free space via a terahertz antenna; for a laser link, the second optical signal is amplified by an erbium-doped fiber amplifier (EDFA) to compensate for spatial loss, and then transmitted into free space by an optical antenna.

[0048] The system receives terahertz waves and performs all-optical downconversion to obtain the first optical baseband signal. It also receives laser signals and performs beam correction and power stabilization to obtain the second optical baseband signal.

[0049] Specifically, at the receiving end, the captured terahertz wave is modulated onto the optical carrier provided by the local tunable laser through an ultra-high-speed electro-optic modulator, and all-optical down-conversion is achieved through wavelength alignment, reconstructing it into a first optical baseband signal; at the same time, the captured laser signal is sequentially subjected to wavefront correction by an optical fast-reflection mirror and power compensation by an erbium-doped fiber amplifier with automatic power control (APC-EDFA), outputting a stable second optical baseband signal.

[0050] The two optical baseband signals are combined and subjected to coherent detection and digital domain demodulation.

[0051] Specifically, the first and second optical baseband signals are fed into an optical combiner for combining, and perfectly reconstructed in the frequency domain into a dual-subcarrier composite optical signal. This composite optical signal uses a coherent optical transceiver for photoelectric detection, and then undergoes digital down-conversion, subband separation, end-to-end adaptive channel equalization, and joint carrier phase recovery in the coherent optical digital signal processing module, finally demodulating the original multi-user data.

[0052] Combination Figure 2As shown, the system mainly includes: a coherent optical digital signal processing module, a coherent optical transceiver, a programmable optical filter, a photonic terahertz transceiver, a laser transceiver, and an optical combiner. Based on dual-subcarrier modulation technology and an all-optical up-conversion mechanism, the system splits the signal at the transmitting end to the terahertz and laser links, and performs seamless combining in the optical domain at the receiving end, realizing the co-driving of two heterogeneous links with a single coherent optical transceiver device.

[0053] In a specific signal transmission embodiment:

[0054] At the transmitting end, the raw user data to be transmitted is first sent to the coherent optical digital signal processing module for processing. Specifically, the coherent optical digital signal processing module uses probabilistic constellation shaping (PCS) technology and symbol rate adaptive algorithm to map the raw data stream into two independent and distinct digital subband signals.

[0055] like Figure 3 As shown, the signal generated by the coherent optical digital signal processing module presents two symmetrically distributed subcarrier envelopes in the frequency domain, namely the first subcarrier (SC-1) and the second subcarrier (SC-2). The first subcarrier (SC-1) and the second subcarrier (SC-2) carry different user data streams. To achieve ultra-high capacity transmission, the modulation bandwidth of each subcarrier is set to no less than 25 GHz, and the frequency spacing between the two subcarriers is set to be greater than 5 GHz to ensure the orthogonality of the signal in the frequency domain and effectively avoid inter-subband interference.

[0056] Subsequently, the two digital subband signals are converted into electrically driven signals by a digital-to-analog converter and sent to an I / Q modulator. The single center wavelength continuous optical carrier generated by the main continuous wave laser is modulated under the control of the electrically driven signal. During this process, the coherent optical digital signal processing module precisely controls the frequency of the driving signal to generate two symmetrical optical sidebands in the frequency domain of the modulated optical signal: the first subcarrier (SC-1) is mapped to the upper sideband of the optical signal in the optical domain, i.e., the first optical carrier (S1); the second subcarrier (SC-2) is mapped to the lower sideband of the optical signal in the optical domain, i.e., the second optical carrier (S2). This optical signal enters a programmable optical filter, which uses its frequency domain selectivity to physically separate the upper and lower sidebands. The separated first optical carrier (S1) enters the terahertz communication link and performs optical heterodyne beat frequency with the second laser to generate a terahertz signal; the separated second optical carrier (S2) enters the laser communication link and is amplified by an erbium-doped fiber amplifier (EDFA) to generate a space laser signal.

[0057] The programmable optical filter receives an optical signal containing dual subcarriers from a coherent optical transceiver at its transmitting end, filters and separates it into a first optical signal and a second optical signal, and outputs the first optical signal and the second optical signal to a photonic terahertz transceiver and a laser transceiver, respectively.

[0058] For the emission of photonic terahertz links:

[0059] The first optical signal is sent to the photonic terahertz transceiver. Specifically, as follows: Figure 4 As shown, the photonic terahertz transceiver includes a first laser (modulated signal carrier) and a second laser (local oscillator carrier). The first optical signal and the local oscillator light generated by the second laser, with a preset frequency difference, are coupled via an optical coupler and then sent to a photodetector. Based on optical heterodyne beat frequency technology, a tunable ultra-wideband terahertz signal is generated. The generated terahertz signal is transmitted by a terahertz antenna, traversing complex weather channels such as rain, snow, clouds, and fog to reach the receiving end.

[0060] For the emission of free-space laser links:

[0061] The second optical signal is sent to the laser transceiver. Specifically, as follows: Figure 5 As shown, the second optical signal is first amplified by an erbium-doped fiber amplifier (EDFA) to compensate for link loss during subsequent spatial transmission. The amplified optical signal is then transmitted into free space via a laser transceiver. Simultaneously, the laser transceiver transmitter is equipped with a camera tracking module to capture the receiver's position in real time, achieving high-precision alignment of the receiver's optical path.

[0062] In a specific signal reception embodiment:

[0063] At the receiving end, the terahertz signal and the laser signal, which have undergone transmission through a complex free-space channel, are captured by the receiving system.

[0064] For receiving data via a terahertz link:

[0065] like Figure 4 As shown, the terahertz signal, after long-distance transmission, is captured by the terahertz antenna and sent to the photonic terahertz transceiver at the receiving end. Specifically, this link uses an ultra-high-speed terahertz electro-optic modulator to directly modulate the received terahertz signal onto a locally supplied continuous optical carrier, generating a multi-sideband optical signal carrying terahertz information. Subsequently, an optical filter is used to filter the multi-sideband optical signal, removing redundant sidebands and the optical carrier, retaining only one optical sideband signal as the first optical baseband signal. This process completely avoids the bandwidth limitations of traditional electronic devices, realizing all-optical down-conversion from terahertz signal to optical baseband signal.

[0066] For receiving free-space laser links:

[0067] like Figure 5As shown, the laser signal transmitted through the atmosphere enters the laser transceiver at the receiving end. Specifically, the received optical signal is first captured by the camera tracking module and then enters the fast optical mirror (FSM). The fast optical mirror performs real-time beam correction to compensate for wavefront distortion and alignment misalignment caused by atmospheric turbulence. Further, the corrected optical signal is fed into an erbium-doped fiber amplifier (APC-EDFA) with automatic power control. The APC-EDFA achieves stable output optical power by monitoring the input optical power in real time and dynamically adjusting the gain, effectively mitigating the deep fading of optical power caused by atmospheric turbulence and aiming errors, thus obtaining the second optical baseband signal.

[0068] For combining and coherent reception:

[0069] The first optical baseband signal obtained through all-optical down-conversion (i.e., the reconstructed first optical carrier S1, carrying the information of the first subcarrier SC-1) and the second optical baseband signal after power stabilization (i.e., the second optical carrier S2, carrying the information of the second subcarrier SC-2) are jointly fed into an optical combiner for coupling and combining. In the frequency domain, this combining process reconstructs two signals transmitted through different physical channels into a composite optical signal with two subcarriers around the same center wavelength. Subsequently, this composite optical signal enters the coherent optical transceiver at the receiving end, where local oscillator light is used for mixing and coherent detection, converting the weak optical signal into a broadband electrical signal containing information from both subcarriers. Then, a real-time digital oscilloscope performs high-speed sampling of the electrical signal, completing analog-to-digital conversion. The digitized received signal is sent to the coherent receiver DSP at the receiving end. Since the terahertz link and the laser link share the same coherent receiver hardware architecture, the coherent optical digital signal processing module performs joint demodulation processing on the two signals in the digital domain.

[0070] The specific process includes: First, the coherent optical digital signal processing module uses digital down-conversion and digital matched filtering techniques, such as... Figure 3 As shown, the first subcarrier (SC-1) and the second subcarrier (SC-2) are accurately separated from the broadband digital signal. Then, considering the distinct channel impairment characteristics of terahertz and laser links, independent end-to-end adaptive intelligent channel equalization is performed on the two separated subcarriers. Furthermore, leveraging the in-phase and co-source characteristics of the two subcarriers at the underlying physical mechanism, joint frequency offset estimation and carrier phase tracking compensation are performed on the first subcarrier (SC-1) and the second subcarrier (SC-2). Finally, QAM demapping and probabilistic constellation shaping inverse decoding are performed on the two compensated subcarriers respectively, ultimately accurately recovering two independent and distinct original user data streams.

[0071] In one embodiment of a spectrum-efficient wireless transmission mode:

[0072] The coherent optical digital signal processing module of the present invention is configured with a high-capacity, high-spectral-efficiency transmission architecture, aiming to maximize the system communication capacity.

[0073] Specifically, the coherent optical digital signal processing module allocates independent and distinct user data streams to the two subcarriers in the system. This means that the first and second subcarriers carry different raw information sequences, thus constructing two parallel, non-redundant data transmission channels. Through this parallel transmission mechanism of heterogeneous link data, the system can deeply and logically integrate the available bandwidth of the terahertz link and the free-space laser link, achieving full utilization of spectrum resources and effectively avoiding the resource waste caused by traditional redundancy backup mechanisms.

[0074] Furthermore, this embodiment introduces symbol rate adaptive technology and probabilistic constellation shaping (PCS) technology in the digital signal processing. PCS technology adjusts the probabilistic weights of the constellation point distribution, enabling it to approach the channel capacity limit under a given signal-to-noise ratio, thereby significantly optimizing the system's spectral efficiency. In this configuration, the modulation bandwidth of a single subcarrier is set to no less than 25 GHz, and the overall system communication rate achieves no less than 200 Gbps. Based on the aforementioned unified digital signal processing architecture, this invention not only achieves efficient reuse of the underlying hardware but also fully meets the performance requirements for high-speed wireless backhaul in multi-user scenarios.

[0075] The technical features of the embodiments described above can be combined arbitrarily. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as the combination of these technical features does not contradict each other, it should be considered within the scope of this specification. The embodiments described above only illustrate several implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the invention patent.

Claims

1. A fully optically integrated terahertz and laser co-existing communication method, characterized in that, include: At the transmitting end, the electrical baseband signal is modulated into an optical signal including dual subcarriers, and the optical signal with dual subcarriers is separated into a first photon signal and a second optical signal by filtering; The first photon signal is upconverted into a terahertz signal and emitted into free space, while the second optical signal is amplified and emitted into free space as a laser signal. At the receiving end, terahertz signals and laser signals in free space are received. The received terahertz signals are downconverted into a first optical baseband signal using all-optical methods. The received laser signals are then subjected to beam correction and power stabilization to obtain a second optical baseband signal. The first and second optical baseband signals are combined and coherently detected and digitally processed to recover the original data.

2. The all-optical fusion terahertz and laser co-existence communication method according to claim 1, characterized in that, Upconverting the first photon signal to a terahertz signal includes: The first photon signal is subjected to optical heterodyne beat frequency processing with a local oscillator optical carrier having a frequency difference to generate a tunable ultrawideband terahertz signal.

3. The all-optical fusion terahertz and laser co-existence communication method according to claim 1, characterized in that, The received terahertz signal is down-converted optically into a first optical baseband signal, including: An ultra-high-speed terahertz electro-optic modulator is used to directly modulate the received terahertz signal onto the optical carrier, and an optical filter is used to filter out one of the optical sideband signals as the first optical baseband signal.

4. The all-optical fusion terahertz and laser co-existence communication method according to claim 1, characterized in that, The received laser signal undergoes beam correction and power stabilization processing, including: The laser signal is beam-corrected by an optical fast-reflection mirror to compensate for power fading caused by atmospheric turbulence, and the corrected optical signal is sent to an erbium-doped fiber amplifier (APC-EDFA) with automatic power control to stabilize the output optical power.

5. The all-optical fusion terahertz and laser co-existence communication method according to claim 1, characterized in that, The dual-subcarrier optical signal has two operating modes: Capacity maximization mode: Two subcarriers transmit different data and are demodulated independently; High reliability mode: The two subcarriers transmit the same data, which is processed at the receiving end through diversity reception and cooperative merging techniques to resist the effects of atmospheric turbulence.

6. A fully optically integrated terahertz and laser co-existing communication device, characterized in that, It includes a coherent optical digital signal processing module, a coherent optical transceiver, a programmable optical filter, a photonic terahertz transceiver, a laser transceiver, and an optical combiner, among which... A coherent optical digital signal processing module, a coherent optical transceiver, and a programmable optical filter are connected in sequence. The programmable optical filter is connected to a photonic terahertz transceiver and a laser transceiver, respectively. The photonic terahertz transceiver and the laser transceiver are respectively connected to a combiner, which is then connected to the coherent optical transceiver. Coherent optical digital signal processing module: The transmitting end of the coherent optical digital signal processing module receives the raw data, generates and outputs a dual subcarrier digital signal to the coherent optical transceiver; the receiving end of the coherent optical digital signal processing module receives the digital electrical signal from the coherent optical transceiver, performs end-to-end adaptive intelligent optimization and demodulation, and finally recovers and outputs the raw data. Coherent optical transceiver: The transmitting end of the coherent optical transceiver receives the dual-subcarrier digital signal from the coherent optical digital signal processing module, performs digital-to-analog conversion and electro-optic modulation, generates and outputs an optical signal containing the dual subcarriers to the programmable optical filter; the receiving end of the coherent optical transceiver receives the combined optical baseband signal from the optical combiner, performs coherent detection, and outputs the generated digital electrical signal to the coherent optical digital signal processing module. Programmable optical filter: The transmitting end of the programmable optical filter receives an optical signal containing dual subcarriers from a coherent optical transceiver, filters and separates it into a first optical signal and a second optical signal, and outputs the first optical signal and the second optical signal to a photonic terahertz transceiver and a laser transceiver, respectively. Photonic terahertz transceiver: The transmitter of the photonic terahertz transceiver receives the first optical signal after it has been filtered and separated by a programmable optical filter, upconverts it by optical heterodyne beat frequency to generate a terahertz signal and transmits it into free space; the receiver of the photonic terahertz transceiver receives the terahertz signal from free space, converts it into a first optical baseband signal by all-optical downconversion technology and outputs it to an optical combiner. Laser transceiver: The transmitting end of the laser transceiver receives the second optical signal, which has been filtered, separated, and amplified by a programmable optical filter, and transmits it into free space as a laser signal; the receiving end of the laser transceiver receives the laser signal from free space, performs tracking, beam correction, and power stabilization processing on it to obtain the second optical baseband signal, and outputs it to the optical combiner; the optical combiner is used to receive the first optical baseband signal from the photonic terahertz transceiver and the second optical baseband signal from the laser transceiver, combine the two signals into a combined optical baseband signal, and output it to the receiving end of the coherent optical transceiver.

7. The all-optical fusion terahertz and laser co-existence communication device according to claim 6, characterized in that, Photonic terahertz transceivers include: The transmitting end of the photonic terahertz transceiver is equipped with a first laser, a second laser, an optical coupler, and a terahertz antenna. The optical carriers output from the first laser and the second laser are coupled by the optical coupler and then subjected to optical heterodyne beat frequency by a photodetector to generate a tunable ultrawideband terahertz signal, which is then transmitted by the terahertz antenna. The receiving end of the photonic terahertz transceiver is equipped with a terahertz electro-optic modulator and an optical filter. The terahertz electro-optic modulator is used to modulate the received terahertz signal onto the local optical carrier, and the optical filter is used to filter out the first optical baseband signal.

8. The all-optical fusion terahertz and laser co-existence communication device according to claim 6, characterized in that, Laser transceivers include: The transmitting end of the laser transceiver is equipped with an erbium-doped fiber amplifier (EDFA) and a camera tracking module. The EDFA amplifies the power of the second optical signal, which has been filtered and separated by a programmable optical filter, and outputs it to an optical antenna. The optical antenna shapes and transmits the amplified optical signal, outputting the amplified second optical signal as a laser signal into free space. The camera tracking module works with the optical antenna to align the receiving end of the laser transceiver. The receiver end of the laser transceiver includes an optical antenna, a camera tracking module, an optical fast-reflecting mirror, and an erbium-doped fiber amplifier (APC-EDFA) with automatic power control. The optical antenna receives laser signals from free space. The camera tracking module captures, tracks, and initially aligns the laser signal received by the optical antenna and transmitted through the atmosphere, guiding the laser signal to the optical fast-reflecting mirror. The optical fast-reflecting mirror performs rapid beam correction on the received laser signal. The erbium-doped fiber amplifier amplifies the corrected laser signal and performs automatic power control to stabilize the output optical power, obtaining the second optical baseband signal.

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