Full-duplex terahertz and space optical fused transmission system

Abstract

The present invention relates to the fields of terahertz communications and optical communications. Disclosed is a full-duplex terahertz and space optical fused transmission system. The system comprises an optical signal transceiver module, which is used for intelligently selecting and switching a terahertz link or a space optical link on the basis of a channel environment and a weather condition, and transmitting an optical signal to a terahertz / space optical fiber wireless conversion module or receiving an optical signal from the terahertz / space optical fiber wireless conversion module; the terahertz / space optical fiber wireless conversion module, which is used for completing processing such as carrier signal generation, data modulation, demodulation and amplification, and splitting and combination in an optical domain and an electrical domain; and a wireless transceiver module, which is used for transmitting or receiving a terahertz signal and a space optical signal in a wireless manner. The present invention can switch a terahertz link or a space optical link on the basis of a channel environment and a weather condition for signal transmission, thereby greatly improving the anti-interference capability of a communication system, and ensuring stable and efficient communication in almost all-weather scenarios such as rain, snow and fog scenarios.

Description

A full-duplex terahertz and space laser fusion transmission system Technical Field

[0001] This invention relates to the fields of terahertz communication and optical communication, and in particular to a full-duplex terahertz and space laser fusion transmission system. Background Technology

[0002] In recent years, with the rapid development of communication technology, the demand for high data transmission rates, low latency, high reliability, and wide-area coverage in communication systems has been continuously increasing. Terahertz communication, due to its ultra-large spectrum bandwidth and high transmission rate, is considered one of the important candidate technologies for future 6G communication networks. Meanwhile, free-space optical communication (FSO), as a wireless communication method based on laser beams, possesses advantages such as high security, high transmission rate, low power consumption, and no spectrum licensing required, making it an effective complementary technology to broadband wireless communication.

[0003] However, relying solely on terahertz communication or free-space laser communication has limitations. While terahertz communication can penetrate smoke, its performance degrades significantly in rain and snow, and terahertz links are susceptible to path loss and scattering effects. Free-space laser communication, on the other hand, is prone to link interruptions in environments with smoke, haze, and atmospheric turbulence. Furthermore, to meet the high reliability requirements of future communication networks, relying on only one communication technology is insufficient to adapt to complex and ever-changing real-world application scenarios.

[0004] Terahertz communication and free-space laser communication differ significantly in their hardware structures at the transmitting and receiving ends. Designing a unified system architecture to reduce hardware complexity is a key challenge. The multimodal coexistence and resource allocation issues of terahertz and laser signals urgently need to be addressed, particularly achieving efficient link switching under different channel environments to improve system reliability. Existing communication systems lack full-duplex fusion transmission schemes for terahertz and laser signals; achieving simultaneous uplink and downlink communication under limited hardware resources is also an important research direction in this field. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a full-duplex terahertz and space laser fusion transmission system. The full-duplex terahertz and space laser fusion transmission system of the present invention adopts dual-link signal transmission of terahertz link and space laser link. When one link experiences a signal interruption or other fault, it can immediately switch to the other link, ensuring the stability of data transmission, realizing high-speed and highly reliable backup transmission, and enhancing the robustness of the system.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] A full-duplex terahertz and space laser fusion transmission system according to the present invention includes at least one set of optical signal transceiver modules, terahertz / space laser fiber-optic wireless conversion modules, and wireless transceiver modules connected in sequence; wherein,

[0008] The optical signal transceiver module is used to select and switch between terahertz links and space laser links. In the transmitting link, it transmits optical signals to the terahertz / space laser fiber optic wireless conversion module. In the receiving link, for the terahertz link, it receives single-sideband signals from the terahertz / space laser fiber optic wireless conversion module, and for the space laser link, it receives optical signals from the terahertz / space laser fiber optic wireless conversion module.

[0009] A terahertz / space laser fiber optic wireless conversion module is used to receive optical signals transmitted from an optical signal transceiver module in the transmission link; wherein,

[0010] For a terahertz link, a first-order sideband signal is generated by driving an optical signal with a radio frequency signal to form an optical modulation signal. The optical modulation signal is then divided into two signals: an odd channel signal and an even channel signal. The even channel signal is beat-frequencyd to form a terahertz signal and amplified. The odd channel signal is also amplified. These two signals are then transmitted to the wireless transceiver module. These two signals refer to the amplified terahertz signal and the amplified odd channel signal.

[0011] For space laser links, the optical signal is amplified and then transmitted to the wireless transceiver module;

[0012] Used in the receiving link:

[0013] For terahertz links, the terahertz signal input from the wireless transceiver module is modulated onto the optical carrier signal to form an optical bandpass signal. Any sideband of the optical bandpass signal is filtered out to form a single sideband signal, which is then transmitted to the optical transceiver module.

[0014] For space laser links, the optical signal input to the wireless transceiver module is amplified and then transmitted to the optical transceiver module.

[0015] The wireless transceiver module is used to wirelessly transmit one terahertz signal and one optical signal from the terahertz / space laser fiber wireless conversion module in the transmission link; wherein, the terahertz signal refers to the amplified terahertz signal output by the terahertz / space laser fiber wireless conversion module, and the optical signal refers to the amplified odd channel signal output by the terahertz / space laser fiber wireless conversion module or the optical signal output by the space laser link.

[0016] In the receiving link, one terahertz signal and one optical signal from external input are received wirelessly and sent to the terahertz / space laser fiber optic wireless conversion module.

[0017] As a further optimization of the full-duplex terahertz and space laser fusion transmission system described in this invention, the optical signal transceiver module includes an SFP+ optical module and a link selection switch; wherein,

[0018] Link selection switch, used to select and switch between terahertz link and space laser link;

[0019] The SFP+ optical module is used in the transmit link to convert electrical signals from the external motherboard into optical signals and transmit the optical signals via optical fiber to the terahertz / space laser fiber optic wireless conversion module. In the receive link, for the terahertz link, the optical fiber receives the single-sideband signal from the terahertz / space laser fiber optic wireless conversion module, and for the space laser link, the optical fiber receives the optical signal from the terahertz / space laser fiber optic wireless conversion module. The module also converts the single-sideband signal or optical signal into electrical signals for further processing by the external motherboard.

[0020] As a further optimization of the full-duplex terahertz and space laser fusion transmission system described in this invention, the terahertz / space laser fiber-to-wireless conversion module includes a first erbium-doped fiber amplifier, a phase modulator, an electro-absorption modulator, a spacer filter, a second erbium-doped fiber amplifier, a photodetector, a first low-noise amplifier, an optical coupler, a third erbium-doped fiber amplifier, a second low-noise amplifier, an intensity modulator, an external cavity laser, a fourth erbium-doped fiber amplifier, a tunable optical filter, and a fifth erbium-doped fiber amplifier; wherein,

[0021] In the transmission link,

[0022] The first erbium-doped fiber amplifier is used to amplify the optical signal to be transmitted in the terahertz link.

[0023] Electroabsorption modulator and phase modulator are used to drive the amplified optical signal to be transmitted to generate a first-order sideband signal, forming an optical modulation signal;

[0024] An interval filter is used to separate the optical modulation signal into odd and even channels to obtain odd channel signals and even channel signals; wherein, the odd channel signal is the baseband signal in the optical modulation signal, and the even channel signal is the two first-order sideband signals in the optical modulation signal.

[0025] The second erbium-doped fiber amplifier is used to amplify the even-channel signal;

[0026] A photodetector is used to perform beat frequency processing on the amplified even-channel signal to generate a terahertz signal.

[0027] The first low-noise amplifier is used to amplify the terahertz signal;

[0028] An optical coupler is used to transmit the odd channel signal of a terahertz link and the optical signal of a space laser link into the same optical fiber.

[0029] The third erbium-doped fiber amplifier is used to amplify the odd channel signal of the terahertz link in the fiber or the optical signal of the space laser link.

[0030] In the receiving link,

[0031] The second low-noise amplifier is used to amplify the terahertz signal input to the wireless transceiver module in the terahertz link.

[0032] An intensity modulator and an external cavity laser are used to modulate the amplified terahertz signal onto an optical carrier signal to form an optical bandpass signal.

[0033] The fourth erbium-doped fiber amplifier is used to amplify the optical bandpass signal;

[0034] A tunable optical filter is used to filter out any sideband of the amplified optical bandpass signal to obtain a single-sideband signal.

[0035] The fifth erbium-doped fiber amplifier is used to amplify the optical signal input from the wireless transceiver module in the space laser link.

[0036] As a further optimization scheme for the full-duplex terahertz and space laser fusion transmission system described in this invention,

[0037] The wireless transceiver module includes an orthogonal mode converter, an optical circulator, a terahertz signal transceiver antenna, and an optical signal transceiver antenna; among which,

[0038] An orthogonal mode converter is used in the transmit link to receive the amplified terahertz signal output from the terahertz / space laser fiber optic wireless conversion module and output the amplified terahertz signal to the terahertz transceiver antenna for transmission; in the receive link, it receives the terahertz signal transmitted by the terahertz signal transceiver antenna and outputs it to the terahertz / space laser fiber optic wireless conversion module.

[0039] An optical circulator is used in the transmit link to receive the amplified odd channel signal output from the terahertz / space laser fiber optic wireless conversion module or the optical signal output from the space laser link, and to output the amplified odd channel signal or the optical signal output from the space laser link to the optical signal transceiver antenna; in the receive link, it receives the optical signal transmitted by the optical signal transceiver antenna and outputs the optical signal to the terahertz / space laser fiber optic wireless conversion module.

[0040] The terahertz signal transceiver antenna is used to wirelessly transmit amplified terahertz signals from the terahertz / space laser fiber optic wireless conversion module in the transmission link; and to wirelessly receive externally input terahertz signals in the reception link and send them to the terahertz / space laser fiber optic wireless conversion module.

[0041] The optical signal transceiver antenna is used to wirelessly transmit the amplified odd channel signal output from the terahertz / space laser fiber optic wireless conversion module or the optical signal output from the space laser link in the transmission link; and to wirelessly receive externally input optical signals in the receiving link and send them to the terahertz / space laser fiber optic wireless conversion module.

[0042] As a further optimization of the full-duplex terahertz and space laser fusion transmission system described in this invention, the two orthogonal terahertz signals from the transmit and receive links are combined into a single signal via an orthogonal mode converter, resulting in mode separation, thus enabling the transmission and reception of terahertz signals using only one antenna; the two optical signals from the transmit and receive links are separated and unidirectionally transmitted via an optical circulator, thus enabling the transmission and reception of optical signals using only one antenna.

[0043] Compared with the prior art, the present invention, employing the above technical solution, has the following technical effects:

[0044] (1) The full-duplex terahertz and space laser fusion transmission system disclosed in this invention can select terahertz link or space laser link for signal transmission according to channel conditions and link environment, making up for the limitations of a single terahertz link or a single space laser link, greatly improving the anti-interference capability of the communication system, and ensuring stable and efficient communication in almost all weather scenarios such as rain, snow, and fog.

[0045] (2) The full-duplex terahertz and space laser fusion transmission system of the present invention adopts dual-link signal transmission of terahertz link and space laser link. When one link experiences a signal interruption or other fault, it can immediately switch to the other link, ensuring the stability of data transmission, realizing high-speed and highly reliable backup transmission, and enhancing the robustness of the system. Attached Figure Description

[0046] Figure 1 is a schematic diagram of a full-duplex terahertz and space laser fusion transmission system provided in an embodiment of the present invention;

[0047] Figure 2 is a schematic diagram of another module of a full-duplex terahertz and space laser fusion transmission system provided in an embodiment of the present invention;

[0048] Figure 3 is a structural block diagram of a full-duplex terahertz and space laser fusion transmission system provided in an embodiment of the present invention;

[0049] Figure 4 is a structural block diagram of a full-duplex terahertz and space laser fusion transmission system provided by an embodiment of the present invention to achieve full-duplex operation;

[0050] Figure 5 is a schematic diagram of the spectrum of corresponding nodes in a link of a full-duplex terahertz and space laser fusion transmission system provided in an embodiment of the present invention; wherein, (a) is a schematic diagram of the spectrum of the first node A located between the first phase modulator 2a2 and the first spacing filter 2a4, (b) is a schematic diagram of the spectrum of the second node B located between the first spacing filter 2a4 and the second erbium-doped fiber amplifier 2a5, (c) is a schematic diagram of the spectrum of the third node C located between the first spacing filter 2a4 and the first optical coupler 2a8, (d) is a schematic diagram of the spectrum of the fourth node D located between the second intensity modulator 5a2 and the sixth erbium-doped fiber amplifier 5a4, and (e) is a schematic diagram of the spectrum of the fifth node E located between the second tunable optical filter 5a5 and the link selection switch 63 at the Rx end of the second optical signal transceiver module 6.

[0051] The reference numerals in the attached figures are explained as follows:

[0052] 1-First optical signal transceiver module; 2-First terahertz / space laser fiber optic wireless conversion module; 3-First wireless transceiver module; 4-Second wireless transceiver module; 5-Second terahertz / space laser fiber optic wireless conversion module; 6-Second optical signal transceiver module.

[0053] 11-First optical module SFP+, 12-Link selection switch at the Tx end of the first optical signal transceiver module 1, 13-Link selection switch at the Rx end of the first optical signal transceiver module 1, 2a1-First erbium-doped fiber amplifier, 2a2-First phase modulator, 2a3-First electroabsorption modulator, 2a4-First spacing filter, 2a5-Second erbium-doped fiber amplifier, 2a6-First photodetector, 2a7-First low-noise amplifier, 2a8-First optical coupler, 2a9-Third erbium-doped fiber amplifier, 31-First quadrature mode converter, 32-First terahertz signal transceiver antenna, 33-First optical circulator, 34-First optical signal transceiver antenna, 2b1-Second low-noise amplifier, 2b2-First intensity modulator, 2b3-First external cavity laser, 2b4-Fourth erbium-doped fiber amplifier, 2b5-First tunable optical filter, 2b6-Fifth erbium-doped fiber amplifier

[0054] A, B, C, D, and E represent the first to fifth nodes, respectively.

[0055] 41-Second terahertz signal transceiver antenna; 42-Second quadrature mode converter;

[0056] 5a1 - Third low-noise amplifier, 5a2 - Second intensity modulator, 5a3 - Second external cavity laser, 5a4 - Sixth erbium-doped fiber amplifier, 5a5 - Second tunable optical filter, 5a6 - Seventh erbium-doped fiber amplifier.

[0057] 5b1 - Eighth erbium-doped fiber amplifier, 5b2 - Second phase modulator, 5b3 - Second electroabsorption modulator, 5b4 - Second spacing filter, 5b5 - Ninth erbium-doped fiber amplifier, 5b6 - Second photodetector, 5b7 - Fourth low-noise amplifier, 5b8 - Second optical coupler, 5b9 - Tenth erbium-doped fiber amplifier;

[0058] 43 - Second optical transceiver antenna; 44 - Second optical circulator; 61 - Second optical module SFP+; 62 - Link selection switch at the Tx end of the second optical transceiver module 6; 63 - Link selection switch at the Rx end of the second optical transceiver module 6. Detailed Implementation

[0059] 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.

[0060] Figure 1 is a schematic diagram of a full-duplex terahertz and space laser fusion transmission system provided in an embodiment of the present invention. The terahertz and space laser fusion transmission system in this embodiment can select either a terahertz link or a space laser link for signal transmission according to channel conditions and link environment, making up for the limitations of a single terahertz link or a single space laser link, greatly improving the anti-interference capability of the communication system, and ensuring stable and efficient communication in almost all-weather scenarios such as rain, snow, and fog. The terahertz and space laser fusion transmission system in this embodiment adopts dual-link signal transmission of terahertz link and space laser link. When one link experiences a signal interruption or other fault, it can immediately switch to the other link, ensuring the stability of data transmission, realizing high-speed and highly reliable backup transmission, and enhancing the robustness of the system.

[0061] The system corresponding to this embodiment includes a set of optical signal transceiver modules, terahertz / space laser fiber wireless conversion modules, and wireless transceiver modules connected in sequence;

[0062] The optical signal transceiver module is used to select and switch between a terahertz link and a space laser link. In the transmitting link, it transmits optical signals to the terahertz / space laser fiber optic wireless conversion module. In the receiving link, for the terahertz link, it receives single-sideband signals from the terahertz / space laser fiber optic wireless conversion module, and for the space laser link, it receives optical signals from the terahertz / space laser fiber optic wireless conversion module.

[0063] The terahertz / space laser fiber optic wireless conversion module is used to receive optical signals transmitted from the optical signal transceiver module in the transmission link; wherein,

[0064] For a terahertz link, a first-order sideband signal is generated by driving an optical signal with a radio frequency signal to form an optical modulation signal. The optical modulation signal is divided into two signals: an odd channel signal and an even channel signal. The even channel signal is beat-frequencyd to form a terahertz signal and the terahertz signal is amplified. The odd channel signal is amplified. These two signals are then transmitted to the wireless transceiver module. These two signals refer to the amplified terahertz signal and the amplified odd channel signal.

[0065] For space laser links, the optical signal is amplified and then transmitted to the wireless transceiver module;

[0066] Used in the receiving link:

[0067] For terahertz links, the terahertz signal input from the wireless transceiver module is modulated onto the optical carrier signal to form an optical bandpass signal. Any sideband of the optical bandpass signal is filtered out to form a single sideband signal, which is then transmitted to the optical transceiver module.

[0068] For space laser links, the optical signal input to the wireless transceiver module is amplified and then transmitted to the optical signal transceiver module.

[0069] The wireless transceiver module is used to wirelessly transmit one terahertz signal and one optical signal from the terahertz / space laser fiber wireless conversion module in the transmission link; wherein, one terahertz signal refers to the amplified terahertz signal output by the terahertz / space laser fiber wireless conversion module, and one optical signal refers to the amplified odd channel signal output by the terahertz / space laser fiber wireless conversion module or the optical signal output by the space laser link.

[0070] In the receiving link, one terahertz signal and one optical signal from external input are received wirelessly and sent to the terahertz / space laser fiber wireless conversion module.

[0071] As shown in Figure 3, in one embodiment, the optical transceiver module includes an optical module SFP+ and a link selection switch;

[0072] The link selection switch is used to select and switch between a terahertz link and a space laser link according to channel conditions and weather conditions; the commercial optical module SFP+ is used in the transmit link to convert electrical signals from an external motherboard into optical signals and transmit the optical signals via optical fiber to the terahertz / space laser fiber optic wireless conversion module; in the receive link, for the terahertz link, the optical fiber receives the single-sideband signal from the terahertz / space laser fiber optic wireless conversion module, and for the space laser link, the optical fiber receives the optical signal from the terahertz / space laser fiber optic wireless conversion module; and converts the single-sideband signal or optical signal into an electrical signal;

[0073] As shown in Figure 3, in one embodiment, the terahertz / space laser fiber wireless conversion module includes a first erbium-doped fiber amplifier, a first phase modulator, a first electroabsorption modulator, a first spaced filter, a second erbium-doped fiber amplifier, a first photodetector, a first low-noise amplifier, a first optical coupler, a third erbium-doped fiber amplifier, a second low-noise amplifier, a first intensity modulator, a first external cavity laser, a fourth erbium-doped fiber amplifier, a first tunable optical filter, and a fifth erbium-doped fiber amplifier.

[0074] For the transmission link, the first erbium-doped fiber amplifier is used to amplify the optical signal to be transmitted in the terahertz link; the first electroabsorption modulator and the first phase modulator are used to drive the optical signal to be transmitted to generate a first-order sideband signal, forming an optical modulation signal; the first spacing filter is used to separate the optical modulation signal into odd and even channels, obtaining odd channel signals and even channel signals; wherein, the odd channel signal is the baseband signal in the optical modulation signal, and the even channel signal is the two first-order sideband signals in the optical modulation signal; the second erbium-doped fiber amplifier is used to amplify the even channel signal, and the first photodetector is used to perform beat frequency processing on the even channel signal to generate the terahertz signal; the first low-noise amplifier is used to amplify the terahertz signal; the first optical coupler is used to transmit the odd channel signal of the terahertz link and the optical signal of the space laser link into the same optical fiber; the third erbium-doped fiber amplifier is used to amplify the odd channel signal of the terahertz link or the optical signal of the space laser link in the optical fiber;

[0075] For the receiving link, the second low-noise amplifier amplifies the terahertz signal input to the wireless transceiver module in the terahertz link; the first intensity modulator and the first external cavity laser modulate the terahertz signal onto the optical carrier signal to form the optical bandpass signal; the fourth erbium-doped fiber amplifier amplifies the optical bandpass signal; and the first tunable optical filter filters out any sideband of the optical bandpass signal to obtain the single-sideband signal. The fifth erbium-doped fiber amplifier amplifies the optical signal in the space laser link.

[0076] As shown in Figure 3, in one embodiment, the wireless transceiver module includes a first orthogonal mode converter, a first optical circulator, a first terahertz signal transceiver antenna, and a first optical signal transceiver antenna.

[0077] The first quadrature mode converter is used to receive, in the transmit link, the amplified terahertz signal output from the terahertz / space laser fiber optic wireless conversion module, and output the amplified terahertz signal to the first terahertz transceiver antenna for transmission; in the receive link, it receives the terahertz signal transmitted by the first terahertz signal transceiver antenna and outputs it to the terahertz / space laser fiber optic wireless conversion module; the first optical circulator is used to receive, in the transmit link, the amplified odd-channel signal output from the terahertz / space laser fiber optic wireless conversion module or the optical signal output from the space laser link, and output the amplified odd-channel signal or the optical signal output from the space laser link to the first optical signal transceiver antenna; in the receive link, it receives the optical signal transmitted by the first optical signal transceiver antenna, and... The optical signal is output to the terahertz / space laser fiber optic wireless conversion module; the first terahertz signal transceiver antenna is used to wirelessly transmit the amplified terahertz signal output from the terahertz / space laser fiber optic wireless conversion module in the transmission link; and in the receiving link, it is used to wirelessly receive externally input terahertz signals and send them to the terahertz / space laser fiber optic wireless conversion module; the first optical signal transceiver antenna is used to wirelessly transmit the amplified odd channel signal output from the terahertz / space laser fiber optic wireless conversion module or the optical signal output from the space laser link in the transmission link; and in the receiving link, it is used to wirelessly receive externally input optical signals and send them to the terahertz / space laser fiber optic wireless conversion module.

[0078] Figure 2 is a schematic diagram of another module of a full-duplex terahertz and space laser fusion transmission system provided in an embodiment of the present invention. The system includes two sets of optical signal transceiver modules, a terahertz / space laser fiber wireless conversion module, and a wireless transceiver module connected in sequence, which can realize full-duplex signal transmission.

[0079] Figure 4 shows the specific structure of a full-duplex terahertz and space laser fusion transmission system according to an embodiment of the present invention, including two sets of optical signal transceiver modules, a terahertz / space laser fiber wireless conversion module, and a wireless transceiver module connected in sequence.

[0080] Specifically, the uplink includes: a first optical signal transceiver module 1, a first terahertz / space laser fiber optic wireless conversion module 2, a first wireless transceiver module 3, a second wireless transceiver module 4, a second terahertz / space laser fiber optic wireless conversion module 5, and a second optical signal transceiver module 6.

[0081] The downlink includes: a second optical signal transceiver module 6, a second terahertz / space laser fiber wireless conversion module 5, a second wireless transceiver module 4, a first wireless transceiver module 3, a first terahertz / space laser fiber wireless conversion module 2, and a first optical signal transceiver module 1;

[0082] Figure 5 shows a schematic diagram of the corresponding nodes in a link of a full-duplex terahertz and space laser fusion transmission system according to a specific embodiment of the present invention. Figures (a), (b), (c), (d), and (e) in Figure 5 correspond to the first node A, the second node B, the third node C, the fourth node D, and the fifth node E in Figure 4, respectively. Specifically, the first node A is located between the first phase modulator 2a2 and the first spacing filter 2a4; the second node B is located between the first spacing filter 2a4 and the second erbium-doped fiber amplifier 2a5; the third node C is located between the first spacing filter 2a4 and the first optical coupler 2a8; the fourth node D is located between the second intensity modulator 5a2 and the sixth erbium-doped fiber amplifier 5a4; and the fifth node E is located between the second tunable optical filter 5a5 and the link selection switch 63 at the Rx end of the second optical signal transceiver module 6.

[0083] When the uplink is working, in the first optical transceiver module 1, the first optical module SFP+11 converts the electrical signal from the external motherboard into an optical signal, and selects and switches between a terahertz link and a space laser link through the link selection switch 12 at the Tx end of the first optical transceiver module 1. The link selection status of the link selection switch 12 at the Tx end of the first optical transceiver module 1 is consistent with the link selection status of the link selection switch 63 at the Rx end of the second optical transceiver module 6. If the link selection switch 12 at the Tx end of the first optical transceiver module 1 is active... In section 12, a terahertz link is selected. The optical signal to be transmitted enters the first terahertz / space laser fiber wireless conversion module 2. The optical signal to be transmitted undergoes preliminary power amplification through the first erbium-doped fiber amplifier 2a1 to improve the quality of subsequent signal processing. Subsequently, the first phase modulator 2a2 and the first electroabsorption modulator 2a3 perform phase modulation on the optical signal to be transmitted. The radio frequency signal drives the optical signal to be transmitted to generate a first-order sideband, forming an optical modulation signal. For example, if the frequency of the optical signal transmitted by the first optical signal transceiver module 1 is f2, and the frequency of the radio frequency signal is f... clock =50GHz, then the radio frequency signal f clockThe optical signal to be transmitted is driven to generate first-order sidebands with frequencies f1 and f3, as shown in Figure 5(a), where f2-f1 = 50 GHz, f3-f2 = 50 GHz, and fΔ = f3-f = 100 GHz. Therefore, the frequency of the terahertz signal generated by the subsequent beat frequency is 100 GHz. This optical modulation signal is separated into odd-channel and even-channel signals by the first interval filter 2a4. The even-channel signal is the first-order sideband signal in the optical modulation signal, as shown in Figure 5(b), and the odd-channel signal is the baseband signal in the optical modulation signal, as shown in Figure 5(c). The optical signal and the even-channel signal are transmitted in two separate paths. The even-channel signal is amplified by the second erbium-doped fiber amplifier 2a5, and then beats through the first photodetector 2a6 to convert the optical signal into a terahertz signal with a frequency of 100 GHz. The resulting terahertz signal is amplified by the first low-noise amplifier 2a7 and transmitted into the first wireless transceiver module. The terahertz signal is input from the horizontal polarization port of the first quadrature mode converter 31, output from the common port of the first terahertz quadrature mode converter 31, and then transmitted wirelessly through the first terahertz transceiver antenna 32. The first optical coupler 2a8 transmits the odd channel signal from the terahertz link and the optical signal from the space laser link into the same optical fiber. After passing through the first optical coupler 2a8, the odd channel signal is amplified by the third erbium-doped fiber amplifier 2a9 and enters the first wireless transceiver module 3. This odd channel signal is input from the first port of the first optical circulator 33, output from the second port of the first optical circulator 33, and transmitted through the first optical signal transceiver antenna 34. If the link selection switch 12 at the Tx end of the first optical signal transceiver module 1 selects the space laser link, then the transmission path of the optical signal to be transmitted is the same as... In the terahertz link, the transmission path of the odd channel signal is the same. Specifically, the optical signal to be transmitted enters the first terahertz / space laser fiber wireless conversion module 2, passes through the first optical coupler 2a8, and is then enhanced by the third erbium-doped fiber amplifier 2a9 before entering the first wireless transceiver module 3. The optical signal to be transmitted is input from the first port of the first optical circulator 33, output from the second port of the first optical circulator 33, and transmitted through the first optical signal transceiver antenna 34. The first optical signal transceiver antenna 34 can transmit the odd channel signal in the terahertz link or the optical signal in the space laser link according to the link selection.In the second wireless transceiver module 4, in the terahertz link, the second terahertz signal transceiver antenna 41 receives the terahertz signal transmitted from the first terahertz signal transceiver antenna 32 in the first wireless transceiver module 3. This terahertz signal is input from the common port of the second quadrature mode converter 41, output from the horizontal polarization port of the second quadrature mode converter 41, and enters the second terahertz / space laser fiber wireless conversion module 5. The signal is amplified by the third low-noise amplifier 5a1, and the second intensity modulator 5a2 and the second external cavity laser 5a3 convert the terahertz signal into a signal that is transmitted via a terahertz signal. The signal is modulated onto the optical signal to form an optical bandpass signal. Specifically, the frequency of the terahertz signal is 100 GHz. If the frequency of the optical carrier signal provided by the second external cavity laser 5a3 is f5, then after receiving the terahertz signal and the optical carrier signal, the second intensity modulator 5a2 modulates the terahertz signal onto the optical carrier signal, generating two first-order sideband signals with frequencies of f4 = f5 - fΔ and f6 = f5 + fΔ, as shown in Figure 5(d). This optical bandpass signal is amplified by the sixth erbium-doped fiber amplifier 5a4, and then... A single-sideband signal is obtained by filtering out any sideband in the optical bandpass signal through the second tunable optical filter 5a5. Specifically, if the sideband corresponding to the high frequency f6 is filtered out, the resulting single-sideband signal is shown in Figure 5(e). This single-sideband signal enters the second optical transceiver module 6, and after passing through the link selection switch 63 at the Rx end of the second optical transceiver module 6, it enters the second optical module SFP+61. The first optical module SFP+61 converts the optical signal into an electrical signal for further processing by the external motherboard. In the space laser link, the second optical signal... The first transceiver antenna 43 receives the optical signal emitted by the first optical signal transceiver antenna 34 in the first wireless transceiver module 3. The optical signal is input from the second port of the second optical circulator 44 and output from the third port of the second optical circulator 44. The power is amplified by the seventh erbium-doped fiber amplifier 5a6 and enters the second optical signal transceiver module 6. After passing through the link selection switch 63 at the Rx end of the second optical signal transceiver module 6, it enters the second optical module SFP+61. The second optical module SFP+61 converts the optical signal into an electrical signal for further processing by the external motherboard.

[0084] When the downlink is working, in the second optical transceiver module 6, the second optical module SFP+61 converts the electrical signal from the external motherboard into an optical signal. The link selection switch 62 at the Tx end of the second optical transceiver module 6 selects and switches between a terahertz link and a space laser link. The link selection status of the link selection switch 62 at the Tx end of the second optical transceiver module 6 is consistent with the link selection status of the link selection switch 13 at the Rx end of the first optical transceiver module 1. If the link selection switch 62 at the Tx end of the second optical transceiver module 6 selects the terahertz link, the optical signal to be transmitted enters the second terahertz / space laser fiber wireless conversion module 5. The optical signal to be transmitted undergoes preliminary power amplification through the eighth erbium-doped fiber amplifier 5b1 to improve the quality of subsequent signal processing. Subsequently, the second phase modulator 5b2 and the second electroabsorption modulator 5b3 perform phase modulation on the optical signal to be transmitted, and the radio frequency signal f... clockThe optical signal to be transmitted is driven to generate a first-order sideband, forming an optical modulation signal. This optical signal is separated into odd-channel and even-channel signals by the second spacing filter 5b4, and then enters different processing paths. The even-channel signal is amplified by the ninth erbium-doped fiber amplifier 5b5, and then beat-frequency converted into a terahertz signal by the second photodetector 5b6. The resulting terahertz signal is amplified by the fourth low-noise amplifier 5b7 and transmitted to the second wireless transceiver module 4. The terahertz signal is input from the vertical polarization port of the second quadrature mode converter 42, output from the common port of the second quadrature mode converter 42, and then transmitted wirelessly through the second terahertz signal transceiver antenna 41. The second optical coupler 5b8 transmits the odd-channel signal in the terahertz link and the optical signal in the space laser link into the same optical fiber. After passing through the second optical coupler 5b8, the odd-channel signal is amplified by the tenth erbium-doped fiber amplifier 5b9. Upon entering the second wireless transceiver module 4, the odd channel signal is input from the first port of the second optical circulator 44, output from the second port of the second optical circulator 44, and wirelessly transmitted through the second optical signal transceiver antenna 43. If the link selection switch 62 at the Tx end of the second optical signal transceiver module 6 selects the space laser link, the transmission path of the optical signal to be transmitted is the same as the transmission path of the odd channel signal in the terahertz link. Specifically, the optical signal to be transmitted enters the second terahertz / space laser fiber wireless conversion module 5, passes through the second optical coupler 5b8, and is then amplified by the tenth erbium-doped fiber amplifier 5b9 before entering the second wireless transceiver module 4. The signal is input from the first port of the second optical circulator 44, output from the second port of the second optical circulator 44, and wirelessly transmitted through the second optical signal transceiver antenna 43. The second optical signal transceiver antenna 43 can transmit either the odd channel signal in the terahertz link or the optical signal in the space laser link depending on the link selection.In the first wireless transceiver module 3, in the terahertz link, the first terahertz signal transceiver antenna 32 receives the terahertz signal emitted by the second terahertz signal transceiver antenna 41 in the second wireless transceiver module 4. This terahertz signal is input from the common port of the first quadrature mode converter 31 and output from the vertical polarization port of the first quadrature mode converter 31, entering the first terahertz / space laser fiber wireless conversion module 2. The signal is amplified by the second low-noise amplifier 2b1. The first intensity modulator 2b2 and the first external cavity laser 2b3 modulate the terahertz signal onto an optical signal, forming an optical bandpass signal. The signal power is amplified by the fourth erbium-doped fiber amplifier 2b4, and then any sideband in the optical bandpass signal is filtered out by the first tunable optical filter 2b5 to obtain a single-sideband signal. This single-sideband signal enters the first optical signal transceiver module 1 and passes through the first optical signal transceiver module 2. After the link selection switch 13 at the Rx end of the transceiver module 1, the signal enters the first optical module SFP+11. The first optical module SFP+11 converts the optical signal into an electrical signal for further processing by the external motherboard. In the space laser link, the first optical signal transceiver antenna 34 receives the optical signal emitted by the second optical signal transceiver antenna 43 in the second wireless transceiver module 4. This optical signal is input from the second port of the first optical circulator 33 and output from the third port of the first optical circulator 33. It enters the first terahertz / space laser fiber wireless conversion module 2, and after being amplified by the fifth erbium-doped fiber amplifier 2b6, it enters the first optical signal transceiver module 1. After passing through the link selection switch 13 at the Rx end of the first optical signal transceiver module 1, it enters the first optical module SFP+11. The first optical module SFP+11 converts the optical signal into an electrical signal for further processing by the external motherboard.

[0085] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0086] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0087] It should be understood that the various forms of processes shown above can be used to reorder, add, or delete steps. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this invention does not impose any limitations on them.

[0088] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A full-duplex terahertz and space laser fusion transmission system, characterized in that, It includes at least one set of optical signal transceiver modules, terahertz / space laser fiber optic wireless conversion modules, and wireless transceiver modules connected in sequence; wherein, The optical signal transceiver module is used to select and switch between terahertz links and space laser links. In the transmitting link, it transmits optical signals to the terahertz / space laser fiber optic wireless conversion module. In the receiving link, for the terahertz link, it receives single-sideband signals from the terahertz / space laser fiber optic wireless conversion module, and for the space laser link, it receives optical signals from the terahertz / space laser fiber optic wireless conversion module. A terahertz / space laser fiber optic wireless conversion module is used to receive optical signals transmitted from an optical signal transceiver module in the transmission link; wherein, For a terahertz link, a first-order sideband signal is generated by driving an optical signal with a radio frequency signal to form an optical modulation signal. The optical modulation signal is then divided into two signals: an odd channel signal and an even channel signal. The even channel signal is beat-frequencyd to form a terahertz signal and amplified. The odd channel signal is also amplified. These two signals are then transmitted to the wireless transceiver module. These two signals refer to the amplified terahertz signal and the amplified odd channel signal. For space laser links, the optical signal is amplified and then transmitted to the wireless transceiver module; Used in the receiving link: For terahertz links, the terahertz signal input from the wireless transceiver module is modulated onto the optical carrier signal to form an optical bandpass signal. Any sideband of the optical bandpass signal is filtered out to form a single sideband signal, which is then transmitted to the optical transceiver module. For space laser links, the optical signal input to the wireless transceiver module is amplified and then transmitted to the optical signal transceiver module. The wireless transceiver module is used to wirelessly transmit one terahertz signal and one optical signal from the terahertz / space laser fiber wireless conversion module in the transmission link; wherein, the terahertz signal refers to the amplified terahertz signal output by the terahertz / space laser fiber wireless conversion module, and the optical signal refers to the amplified odd channel signal output by the terahertz / space laser fiber wireless conversion module or the optical signal output by the space laser link. In the receiving link, one terahertz signal and one optical signal from external input are received wirelessly and sent to the terahertz / space laser fiber optic wireless conversion module.

2. The full-duplex terahertz and space laser fusion transmission system according to claim 1, characterized in that, The optical transceiver module includes an SFP+ optical module and a link selection switch; among which, Link selection switch, used to select and switch between terahertz link and space laser link; The SFP+ optical module is used in the transmit link to convert electrical signals from the external motherboard into optical signals and transmit the optical signals via optical fiber to the terahertz / space laser fiber optic wireless conversion module. In the receive link, for the terahertz link, the optical fiber receives the single-sideband signal from the terahertz / space laser fiber optic wireless conversion module, and for the space laser link, the optical fiber receives the optical signal from the terahertz / space laser fiber optic wireless conversion module. The module also converts the single-sideband signal or optical signal into electrical signals for further processing by the external motherboard.

3. The full-duplex terahertz and space laser fusion transmission system according to claim 1, characterized in that, The terahertz / space laser fiber-optic wireless conversion module includes a first erbium-doped fiber amplifier, a phase modulator, an electro-absorption modulator, a spacer filter, a second erbium-doped fiber amplifier, a photodetector, a first low-noise amplifier, an optical coupler, a third erbium-doped fiber amplifier, a second low-noise amplifier, an intensity modulator, an external cavity laser, a fourth erbium-doped fiber amplifier, a tunable optical filter, and a fifth erbium-doped fiber amplifier; wherein, In the transmission link, The first erbium-doped fiber amplifier is used to amplify the optical signal to be transmitted in the terahertz link. Electroabsorption modulator and phase modulator are used to drive the amplified optical signal to be transmitted to generate a first-order sideband signal, forming an optical modulation signal; An interval filter is used to separate the optical modulation signal into odd and even channels to obtain odd channel signals and even channel signals; wherein, the odd channel signal is the baseband signal in the optical modulation signal, and the even channel signal is the two first-order sideband signals in the optical modulation signal; The second erbium-doped fiber amplifier is used to amplify the even-channel signal; A photodetector is used to perform beat frequency processing on the amplified even-channel signal to generate a terahertz signal. The first low-noise amplifier is used to amplify the terahertz signal; An optical coupler is used to transmit the odd channel signal of a terahertz link and the optical signal of a space laser link into the same optical fiber. The third erbium-doped fiber amplifier is used to amplify the odd channel signal of the terahertz link in the fiber or the optical signal of the space laser link. In the receiving link, The second low-noise amplifier is used to amplify the terahertz signal input to the wireless transceiver module in the terahertz link. An intensity modulator and an external cavity laser are used to modulate the amplified terahertz signal onto an optical carrier signal to form an optical bandpass signal. The fourth erbium-doped fiber amplifier is used to amplify the optical bandpass signal; A tunable optical filter is used to filter out any sideband of the amplified optical bandpass signal to obtain a single-sideband signal. The fifth erbium-doped fiber amplifier is used to amplify the optical signal input from the wireless transceiver module in the space laser link.

4. The full-duplex terahertz and space laser fusion transmission system according to claim 1, characterized in that, The wireless transceiver module includes an orthogonal mode converter, an optical circulator, a terahertz signal transceiver antenna, and an optical signal transceiver antenna; among which, An orthogonal mode converter is used in the transmit link to receive the amplified terahertz signal output from the terahertz / space laser fiber optic wireless conversion module and output the amplified terahertz signal to the terahertz transceiver antenna for transmission; in the receive link, it receives the terahertz signal transmitted by the terahertz signal transceiver antenna and outputs it to the terahertz / space laser fiber optic wireless conversion module. An optical circulator is used in the transmit link to receive the amplified odd channel signal output from the terahertz / space laser fiber optic wireless conversion module or the optical signal output from the space laser link, and to output the amplified odd channel signal or the optical signal output from the space laser link to the optical signal transceiver antenna; in the receive link, it receives the optical signal transmitted by the optical signal transceiver antenna and outputs the optical signal to the terahertz / space laser fiber optic wireless conversion module. The terahertz signal transceiver antenna is used to wirelessly transmit amplified terahertz signals from the terahertz / space laser fiber optic wireless conversion module in the transmission link; and to wirelessly receive externally input terahertz signals in the reception link and send them to the terahertz / space laser fiber optic wireless conversion module. The optical signal transceiver antenna is used to wirelessly transmit the amplified odd channel signal output from the terahertz / space laser fiber optic wireless conversion module or the optical signal output from the space laser link in the transmission link; and to wirelessly receive externally input optical signals in the receiving link and send them to the terahertz / space laser fiber optic wireless conversion module.

5. A full-duplex terahertz and space laser fusion transmission system according to claim 4, characterized in that, The two orthogonal terahertz signals from the transmit and receive links are combined into a single signal by an orthogonal mode converter, and mode separation is achieved, enabling the transmission and reception of terahertz signals using only one antenna. The two optical signals from the transmit and receive links are separated and transmitted unidirectionally via an optical circulator, enabling the transmission and reception of optical signals using only one antenna.

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