Silicon-based photonic terahertz wireless communication transmit front-end chip, system and method

Abstract

This invention provides a silicon-based photonic terahertz wireless communication transmitter front-end chip, system, and method, including a silicon photonic chip. The silicon photonic chip generates an electro-optical comb, interleaving the comb teeth according to a predetermined transmission frequency, dividing the comb teeth into multiple groups according to predetermined conditions, and modulating the comb teeth of different groups separately. This invention proposes a multifunctional silicon-based chip design that interleaves the selection of multi-wavelength signals generated by the on-chip electro-optical comb and drives micro-ring modulator arrays with different resonant wavelengths. The chip output signal is connected to a photodetector and a terahertz antenna array, thereby realizing the generation of multi-channel, high-capacity photonic terahertz signals. The chip-level system has a small size and strong scalability.

Description

Technical Field

[0001] This invention relates to the technical field of photonic terahertz communication, specifically to a silicon-based photonic terahertz wireless communication transmitting front-end chip, system, and method. Background Technology

[0002] With the rise of concepts such as the Internet of Things, virtual reality, and autonomous driving, wireless data traffic has experienced unprecedented growth. Therefore, electromagnetic waves in the 0.1-10THz frequency band have attracted widespread attention in the industry. The scheme of generating terahertz signals based on optical heterodyne has its unique advantages. Tunable lasers can easily be used to configure terahertz signals of different frequencies. Furthermore, combined with wavelength division multiplexing devices in optical communication, multi-channel, high-capacity wireless signal transmission can be achieved. The transmitter of a photonic terahertz communication system is formed using many different types of photonic components. Currently, the use of discrete devices in this communication system has been realized. However, for mass use in daily life, these optical components need to be integrated to reduce system size and energy consumption. Simultaneously, low-loss optical fibers are used to drive the transmitter chip, forming the core architecture of future fiber-to-wireless communication.

[0003] Chinese invention patent document CN104503023A discloses an externally modulated few-mode optical communication transmitter chip based on a multimode interferometer structure. The chip includes: a single-longitudinal-mode laser unit, a multimode interferometer mode multiplexer combination unit, a modulator array, and an optical waveguide unit. The single-longitudinal-mode laser unit is used to generate a fundamental mode optical signal; the multimode interferometer mode multiplexer combination unit is used to convert the fundamental mode optical signal generated by the single-longitudinal-mode laser unit into a fundamental mode signal and a higher-order mode signal; the optical waveguide unit is used to transmit the fundamental mode signal and the higher-order mode signal to the modulator array; the modulator array includes multiple modulators, which respectively process the received fundamental mode signal and higher-order mode signal.

[0004] Regarding the aforementioned prior art, the inventors believe that existing terahertz systems suffer from drawbacks such as large size and weak scalability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, the present invention aims to provide a silicon-based photonic terahertz wireless communication transmitter front-end chip, system, and method.

[0006] A silicon-based photonic terahertz wireless communication transmitter front-end chip according to the present invention includes a silicon photonic chip;

[0007] The silicon photonic chip generates an electro-optical comb, which selects the comb teeth alternately according to a predetermined emission frequency, groups the comb teeth according to predetermined conditions, and modulates the comb teeth of different groups respectively.

[0008] Preferably, the silicon photonics chip includes a dual-drive Mach-Zehnder modulator, a demultiplexing module, and multiple sets of modulator components;

[0009] The comb teeth are set up in a one-to-one correspondence with the modulator components;

[0010] The dual-drive Mach-Zehnder modulator modulates an electro-optic comb with a predetermined bandwidth and amplitude by controlling the amplitude, phase, and DC bias of the radio frequency signals on the two arms.

[0011] The demultiplexing module controls the loading of a DC signal and selects multiple comb teeth from the electro-optical comb with a frequency difference equal to the frequency of the emitted terahertz signal, and divides the comb teeth into multiple groups according to predetermined conditions.

[0012] The modulator assembly modulates the corresponding groups of comb teeth.

[0013] Preferably, the number of comb teeth in a group of comb teeth is 2;

[0014] The modulator assembly includes an electrically tunable micro-ring modulator and an electrically tunable phase shifter;

[0015] The electrically tunable micro-ring modulator modulates one comb tooth;

[0016] The electrically tunable phase shifter modulates another comb tooth.

[0017] Preferably, the silicon photonics chip also includes a microwave source;

[0018] The microwave source, combined with a dual-drive Mach-Zehnder modulator, generates an equidistant electro-optical comb with a frequency spacing equal to the microwave source frequency.

[0019] Preferably, the silicon photonics chip also includes multiple beam combiners;

[0020] The modulator assembly modulates the individual comb teeth within the group of comb teeth;

[0021] The beam combiner and modulator components are configured in a one-to-one correspondence.

[0022] The beam combiner combines the signals modulated by the corresponding modulator components.

[0023] A silicon-based photonic terahertz wireless communication transmitting front-end system according to the present invention includes a silicon-based photonic terahertz wireless communication transmitting front-end chip;

[0024] The system also includes a laser, multiple photodetectors, and multiple transmitting terahertz antennas;

[0025] The comb teeth, photodetectors and transmitting terahertz antennas are arranged in a one-to-one correspondence, and the photodetectors and transmitting terahertz antennas are arranged in combination.

[0026] The laser drives the silicon photonic chip to generate an electro-optical comb;

[0027] The photodetector converts the modulated signal into an electrical signal;

[0028] The transmitting terahertz antenna converts electrical signals into terahertz wireless signals.

[0029] Preferably, the system also includes multiple erbium-doped fiber amplifiers and multiple waveform shapers;

[0030] The erbium-doped fiber amplifier, waveform shaper, and photodetector are configured in a one-to-one correspondence.

[0031] The erbium-doped fiber amplifier amplifies the signal after the fiber is bundled.

[0032] The waveform shaper filters out noise from the combined signal.

[0033] Preferably, the system also includes an arbitrary wavelength generator.

[0034] The arbitrary waveform generator provides an radio frequency (RF) signal to the electrically tunable micro-ring modulator, and the RF signal loads the modulation signal by changing the light intensity in the optical waveguide.

[0035] Preferably, the system also includes multiple receiving terahertz antennas, multiple detectors, and multiple oscilloscopes;

[0036] The receiving terahertz antenna, detector, oscilloscope and transmitting terahertz antenna are set up in a one-to-one correspondence, and the receiving terahertz antenna and detector are set up in combination.

[0037] The receiving terahertz antenna receives terahertz wireless signals;

[0038] The detector converts the received terahertz wireless signal into a baseband signal;

[0039] The oscilloscope acquires baseband signals.

[0040] According to the present invention, a silicon-based photonic terahertz wireless communication transmitting front-end method is provided, which applies a silicon-based photonic terahertz wireless communication transmitting front-end system and includes the following steps:

[0041] Step S1: Laser drives silicon photonic chip;

[0042] Step S2: The silicon photonics chip generates an electro-optical comb, and the comb teeth are selected alternately according to a predetermined emission frequency. The comb teeth are divided into multiple groups according to predetermined conditions, and the comb teeth of different groups are modulated respectively.

[0043] Step S3: The photodetector converts the modulated signal into an electrical signal;

[0044] Step S4: The transmitting terahertz antenna converts the electrical signal into a terahertz wireless signal.

[0045] Compared with the prior art, the present invention has the following beneficial effects:

[0046] 1. This invention proposes a multifunctional silicon-based chip design that uses an interleaved selection on-chip electro-optical comb to generate multi-wavelength signals and drive micro-ring modulator arrays with different resonant wavelengths. The chip output signal is connected to a photodetector and a terahertz antenna array, thereby realizing the generation of multi-channel, high-capacity photonic terahertz signals. The chip-level system has a small size and strong scalability.

[0047] 2. This invention configures the operating point of the micro-ring modulator at different frequencies, and utilizes the narrowband characteristics of the micro-ring modulator to ensure that the channels are independent of each other. The multi-channel terahertz modulation module has low crosstalk and low power consumption.

[0048] 3. This invention combines an on-chip electro-optical comb to achieve frequency reuse from light to the terahertz band, and combines the frequency selection characteristics of the modulator to facilitate the tunability of different channel frequencies, and can easily configure data transmission at any terahertz frequency. Attached Figure Description

[0049] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0050] Figure 1 This is a schematic diagram of the principle of the present invention;

[0051] Figure 2 The output frequency comb spectrum of the dual-drive Mach-Zehnder modulator (DD-MZM) is shown.

[0052] Figure 3 The simulation results of this system are shown in the figure.

[0053] Figure 4 This is a system block diagram of the actual experiment of the present invention;

[0054] Figure 5 A micrograph of the chip of the present invention;

[0055] Figure 6 The output spectrum test results of the thermally tuned microring are shown in the figure.

[0056] Figure 7 The output bit error rate curves for a single-channel 80G carrier frequency at different transmission rates are shown.

[0057] Figure 8 This is a performance comparison chart of this system using an electro-optical comb and a free-running laser, respectively. Detailed Implementation

[0058] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the scope of protection of the present invention.

[0059] This invention discloses a silicon-based photonic terahertz wireless communication transmitter front-end chip, such as... Figure 1 and Figure 4 As shown, this includes a silicon photonics chip. The silicon photonics chip generates an electro-optical comb, which selects the comb teeth alternately according to a predetermined emission frequency. The comb teeth are divided into one or more groups according to predetermined conditions, and each group of comb teeth is modulated. Each group of comb teeth contains two teeth. The selection principle for the two comb teeth within a group should be to make their power as similar as possible. Therefore, the selection should be within the power flatness range of the electro-optical comb. Flatness means a frequency range where the power difference between adjacent comb teeth is less than 3dB. The frequency selection of a group of comb teeth should be done pairwise from the outside in within this flatness range. That is, the leftmost and rightmost comb teeth with corresponding frequencies within the usable range of the electro-optical comb form a group, and the frequencies of the two comb teeth in the next group increase by one comb tooth spacing as they move closer to each other. The number of comb teeth output can be controlled according to the required number of comb tooth groups.

[0060] Silicon photonic chips include microwave sources (f RF The system includes a dual-drive Mach-Zehnder modulator, a demultiplexing module (micro-ring filter, also known as a thermally tuned micro-ring), multiple sets of modulator components, and multiple beam combiners (multimode interferometers); the combs, beam combiners, and modulator components are set up one-to-one.

[0061] A dual-drive Mach-Zehnder modulator modulates an electro-optical comb with a predetermined bandwidth and amplitude by controlling the amplitude, phase, and DC bias of the radio frequency (RF) signals on its two arms. A microwave source, combined with the dual-drive Mach-Zehnder modulator, generates an equally spaced electro-optical comb with a frequency spacing equal to the microwave source frequency. Specifically, the two arms of the dual-drive Mach-Zehnder modulator are loaded with RF signals of different phases and amplitudes, and a flat optical frequency comb is obtained by adjusting the DC bias difference between the two arms. The on-chip dual-drive Mach-Zehnder modulator, driven by the microwave source, generates equally spaced electro-optical combs with a frequency spacing equal to the microwave source frequency. The amplitude and phase of the RF signal output from the microwave source affect the output performance of the electro-optical comb. The amplitude of the output RF signal is changed by directly controlling the microwave source, while the phase of the output signal is controlled by an external phase controller.

[0062] The demultiplexing module controls the loading of a DC signal and selects multiple comb teeth from the electro-optical comb with a frequency difference equal to the frequency of the emitted terahertz signal, and divides the comb teeth into multiple groups according to predetermined conditions.

[0063] The modulator assembly modulates corresponding groups of comb teeth, and modulates each individual comb tooth within a group. The modulator assembly includes an electrically tunable micro-ring modulator and an electrically tunable phase shifter. The electrically tunable micro-ring modulator modulates one comb tooth; the electrically tunable phase shifter modulates the other comb tooth.

[0064] The beam combiner combines the signals modulated by the corresponding modulator components.

[0065] This invention also discloses a silicon-based photonic terahertz wireless communication transmitting front-end system, including a silicon-based photonic terahertz wireless communication transmitting front-end chip, a laser, a polarization controller, an arbitrary wavelength generator, multiple erbium-doped fiber amplifiers, multiple waveform shapers, multiple photodetectors, multiple transmitting terahertz antennas, multiple receiving terahertz antennas, multiple detectors, and multiple oscilloscopes.

[0066] The comb, erbium-doped fiber amplifier, waveform shaper, photodetector, transmitting terahertz antenna, receiving terahertz antenna, detector and oscilloscope are set up one by one, and the photodetector and transmitting terahertz antenna are set up in combination, and the receiving terahertz antenna and detector are set up in combination.

[0067] A laser drives a silicon photonic chip to generate an electro-optical comb. A polarization controller controls the polarization state of the light in the optical fiber, ensuring that the output power of the polarization-sensitive silicon photonic chip reaches its optimal level.

[0068] The arbitrary waveform generator provides a pseudo-random binary (PRBS) radio frequency (RF) signal to the electrically tunable microring modulator. This RF signal modulates the signal by altering the light intensity within the optical waveguide. The arbitrary waveform generator then loads either an NRZ or PAM4 signal onto the electrically tunable microring modulator.

[0069] The arbitrary waveform generator provides the phase shifter with a radio frequency signal that can change the phase inside the optical waveguide; that is, the arbitrary waveform generator provides the modulation electrical signal to the phase shifter.

[0070] The photodetector converts the modulated signal into an electrical signal. The transmitting terahertz antenna converts the electrical signal into a terahertz wireless signal (electromagnetic wave signal). In other words, the chip's output is connected to the photodetector and radiated out through the terahertz antenna.

[0071] Erbium-doped fiber amplifiers amplify the combined signal. During system operation, insertion loss occurs, which is compensated by the erbium-doped fiber amplifier (EDFA).

[0072] The waveform shaper filters out out-of-band noise from the combined signal.

[0073] A terahertz receiving antenna receives terahertz wireless signals.

[0074] The detector converts the received terahertz wireless signal into a baseband signal.

[0075] An oscilloscope is used to acquire baseband signals.

[0076] This invention uses a 1550nm laser to drive an on-chip electro-optical comb. The spacing between the comb teeth is determined by the frequency of the radio frequency signal. Then, the comb teeth are selected alternately according to the determined transmission frequency. Every two comb teeth form a group, and the frequency difference is the frequency of different carrier frequencies of the transmitted terahertz signal. Different groups of comb teeth are used to drive each modulator (microring modulator, MRM) of the on-chip modulator array. The microring array corresponds to a combination array of photodetectors (PD) and terahertz antennas, thereby realizing a parallel multi-channel multi-carrier frequency terahertz transmission system.

[0077] The specific optical elements on the silicon-based chip involved in this invention include: a dual-drive Mach-Zehnder modulator (DD-MZM), a thermally tunable microring with a radius of 40 μm, and an electrically tunable microring modulator with a radius of 5 μm. Specific technical details of the system implementation include:

[0078] By controlling the amplitude, phase, and DC bias of the radio frequency signals on both arms of the DD-MZM, an electro-optical comb with required bandwidth and amplitude flatness is modulated, and insertion loss is compensated by an erbium-doped fiber amplifier (EDFA).

[0079] By controlling the DC signal loaded on the 40μm thermally tunable microring, two comb teeth with a frequency difference equal to the frequency of the emitted terahertz signal are interleaved.

[0080] An arbitrary waveform generator (AWG) loads an NRZ (Non-Return-to-Zero) or PAM4 (4-Level Pulse Amplitude Modulation) signal onto an electrically tunable micro-ring modulator with a radius of 5 μm. The chip's output is connected to a photodetector and radiated through a terahertz antenna.

[0081] like Figure 1 As shown, this invention can realize multi-channel parallel terahertz wireless signal transmission. Each channel is independent of each other and uses the same components. The single-channel transmission experimental system is set up as follows: Figure 4The experimental setup requires, in sequence: a 1550nm laser, a silicon photonic chip, an erbium-doped fiber amplifier (EDFA), a wave shaper, a photodetector (PD), and an arbitrary wavelength generator (AWG). The silicon photonic chip contains the following optical components: a dual-drive Mach-Zehnder modulator (DD-MZM), a thermally tunable microring, an electrically tunable microring, and an electrically tunable phase shifter. Figure 5 The diagram shows the chip layout and the distribution of input / output optical fibers coupled to the chip.

[0082] The laser drives a silicon photonic chip via a coupled optical fiber. The two arms of a dual-drive Mach-Zehnder modulator (DD-MZM) are loaded with radio frequency (RF) signals of different phases and amplitudes. A flat optical frequency comb is obtained by adjusting the DC bias difference between the two arms of the DD-MZM, and the comb tooth spacing is determined by the frequency of the RF signal. The simulation uses an RF frequency of 16 GHz, and the results are as follows. Figure 2 In the left part a, the height difference between the comb teeth is controlled within 3dB. The actual measured spectrum of the electro-optical comb is shown below. Figure 2 Part b on the right. The simulation results of this system are as follows: Figure 3 , Figure 3 Left side a part and Figure 3 The right side (b) shows the NRZ signals and their eye diagrams before and after detection. Figure 2 The left side, section a, shows the simulated optical frequency comb output. Figure 2 The right side, section b, shows the 16GHz difference frequency optical frequency comb output from the experiment. Figure 3 The left side, part a, represents the NRZ signal before and after detection; Figure 3 The right side, section b, represents the eye diagram after detection.

[0083] Experimental testing showed that the 40μm radius thermally tuned microring has a 3dB bandwidth of 6GHz and an FSR of 283GHz. Figure 6 As shown, this meets the filter requirements of the system. By controlling two teeth in the DC bias filter output frequency comb of the thermally tunable microring, the frequency difference between the two teeth satisfies the operating frequency band of the photodetector and the terahertz transmitting antenna. One tooth is modulated by the electrically tunable microring modulator, and the other is connected to one end of the electrically tunable phase shifter to investigate the effect of phase on the overall system performance. The two signals are combined by a beam combiner and connected to a high-speed photodetector from the chip output. The detector radiates the signal through the terahertz antenna. The output is connected to the same terahertz antenna and envelope detector. The detector output is connected to a real-time oscilloscope (DSO) for direct demodulation and bit error rate testing of the received electromagnetic wave signal.

[0084] In the actual experiment, the received waveform was processed by a linear equalizer, and the bit error rate of the entire system was tested. The bit error rate results at different transmission rates are as follows: Figure 7 The eye diagram in the figure is a simulated eye diagram after being processed by a linear equalizer. Figure 8 The impact of phase correlation on the transmission performance of this system was investigated, under the same conditions, such as Figure 8 As shown in Figure a, using an electro-optical comb and optical filter based on DD-MZM results in a lower bit error rate compared to two free-running lasers, and as... Figure 8 The right side b section describes the fluctuation distribution of the received waveform sampling points under different light sources. The comparison of the normal distribution curves shows that the former has better noise flatness. Figure 8 The left side, section a, shows the bit error rate curves under different input optical powers; Figure 8 The right side, b, shows the distribution ratio of the noise fluctuation magnitude.

[0085] This invention is an integrated photonic terahertz emission chip system that realizes electro-optical combing, wavelength selection, and modulation functions. The complete system of this invention includes the following components: a laser, a silicon photonic chip, a microwave source, an arbitrary waveform generator, an erbium-doped fiber amplifier, a photodetector, a terahertz antenna, an envelope detector, and a real-time oscilloscope.

[0086] The optical path from input to output at the system's transmitter is as follows: A laser generates C-band single-frequency light, which drives a silicon photonic chip via an embedded fiber. The silicon photonic chip contains optical components including a dual-drive Mach-Zehnder modulator, a multimode interferometer, a thermally tunable microring, and an electrically tunable microring. The dual-drive Mach-Zehnder modulator, combined with a microwave source, generates an equally spaced optical comb signal. The multimode interferometer combines the two thermally tunable microrings to select two comb teeth in the optical comb signal with a frequency spacing corresponding to the desired terahertz band. The frequency-selected optical signal then drives the electrically tunable microring modulator to complete the corresponding multi-channel parallel data transmission function. The chip's output is connected to an erbium-doped fiber amplifier via a vertical grating and a coupling fiber. The chip's output optical signal is amplified by the amplifier and then connected to a high-speed photodetector to output a converted electrical signal.

[0087] The entire system's circuitry mainly consists of four parts: 1. A microwave source drives an on-chip dual-drive Mach-Zehnder modulator to generate an equidistant electro-optical comb with a frequency spacing equal to the microwave source frequency; 2. An arbitrary waveform generator provides a PRBS radio frequency signal to the silicon photonics chip, and the electrical signal is modulated by changing the light intensity within the optical waveguide; 3. The electrical signal output by the high-speed photodetector is converted into electromagnetic waves by a terahertz antenna and transmitted; 4. The receiving end terahertz antenna receives the electromagnetic waves and, in conjunction with an envelope detector, downconverts the radio frequency signal to baseband. The baseband waveform is then acquired by a real-time oscilloscope and processed digitally.

[0088] This invention also provides a silicon-based photonic terahertz wireless communication transmitting front-end method, which applies a silicon-based photonic terahertz wireless communication transmitting front-end system and includes the following steps:

[0089] Step S1: Laser drives silicon photonic chip.

[0090] Step S2: The silicon photonic chip generates an electro-optical comb, and the comb teeth are selected alternately according to a predetermined emission frequency. The comb teeth are divided into multiple groups according to predetermined conditions, and the comb teeth of different groups are modulated respectively.

[0091] Step S3: The photodetector converts the modulated signal into an electrical signal.

[0092] Step S4: The transmitting terahertz antenna converts the electrical signal into a terahertz wireless signal.

[0093] In the description of this application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0094] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A silicon-based photonic terahertz wireless communication transmitter front-end chip, characterized in that, Including silicon photonics chips; The silicon photonic chip generates an electro-optical comb, selects the comb teeth of the electro-optical comb alternately according to a predetermined emission frequency, groups the comb teeth according to predetermined conditions, and modulates the comb teeth of different groups respectively. The silicon photonics chip includes a dual-drive Mach-Zehnder modulator, a demultiplexing module, and multiple sets of modulator components. The comb teeth are set up in a one-to-one correspondence with the modulator components; The dual-drive Mach-Zehnder modulator modulates an electro-optic comb with a predetermined bandwidth and amplitude by controlling the amplitude, phase, and DC bias of the radio frequency signals on the two arms. The demultiplexing module controls the loading of a DC signal and selects multiple comb teeth from the electro-optical comb with a frequency difference equal to the frequency of the emitted terahertz signal, and divides the comb teeth into multiple groups according to predetermined conditions. The modulator assembly modulates the corresponding groups of comb teeth; The number of comb teeth in a group is 2; The modulator assembly includes an electrically tunable micro-ring modulator and an electrically tunable phase shifter; The electrically tunable micro-ring modulator modulates one comb tooth; The electrically tunable phase shifter modulates another comb tooth.

2. The silicon-based photonic terahertz wireless communication transmitter front-end chip according to claim 1, characterized in that, The silicon photonics chip also includes a microwave source; The microwave source, combined with a dual-drive Mach-Zehnder modulator, generates an equidistant electro-optical comb with a frequency spacing equal to the microwave source frequency.

3. The silicon-based photonic terahertz wireless communication transmitter front-end chip according to claim 1, characterized in that, The silicon photonics chip also includes multiple beam combiners; The modulator assembly modulates the individual comb teeth within the group of comb teeth; The beam combiner and modulator components are configured in a one-to-one correspondence. The beam combiner combines the signals modulated by the corresponding modulator components.

4. A silicon-based photonic terahertz wireless communication transmitting front-end system, characterized in that, Includes the silicon-based photonic terahertz wireless communication transmitter front-end chip as described in any one of claims 1-3; The system also includes a laser, multiple photodetectors, and multiple transmitting terahertz antennas; The comb teeth, photodetectors and transmitting terahertz antennas are arranged in a one-to-one correspondence, and the photodetectors and transmitting terahertz antennas are arranged in combination. The laser drives the silicon photonic chip to generate an electro-optical comb; The photodetector converts the modulated signal into an electrical signal; The transmitting terahertz antenna converts electrical signals into terahertz wireless signals.

5. The silicon-based photonic terahertz wireless communication transmitting front-end system according to claim 4, characterized in that, The system also includes multiple erbium-doped fiber amplifiers and multiple waveform shapers; The erbium-doped fiber amplifier, waveform shaper, and photodetector are configured in a one-to-one correspondence. The erbium-doped fiber amplifier amplifies the signal after the fiber is bundled. The waveform shaper filters out noise from the combined signal.

6. The silicon-based photonic terahertz wireless communication transmitting front-end system according to claim 4, characterized in that, The system also includes an arbitrary wavelength generator. The arbitrary waveform generator provides an radio frequency (RF) signal to the electrically tunable micro-ring modulator, and the RF signal loads the modulation signal by changing the light intensity in the optical waveguide.

7. The silicon-based photonic terahertz wireless communication transmitting front-end system according to claim 4, characterized in that, The system also includes multiple receiving terahertz antennas, multiple detectors, and multiple oscilloscopes; The receiving terahertz antenna, detector, oscilloscope and transmitting terahertz antenna are set up in a one-to-one correspondence, and the receiving terahertz antenna and detector are set up in combination. The receiving terahertz antenna receives terahertz wireless signals; The detector converts the received terahertz wireless signal into a baseband signal; The oscilloscope acquires baseband signals.

8. A silicon-based photonic terahertz wireless communication transmitting front-end method, characterized in that, The silicon-based photonic terahertz wireless communication transmitting front-end system according to claim 4 includes the following steps: Step S1: Laser drives silicon photonic chip; Step S2: The silicon photonics chip generates an electro-optical comb, and the comb teeth are selected alternately according to a predetermined emission frequency. The comb teeth are divided into multiple groups according to predetermined conditions, and the comb teeth of different groups are modulated respectively. Step S3: The photodetector converts the modulated signal into an electrical signal; Step S4: The transmitting terahertz antenna converts the electrical signal into a terahertz wireless signal.

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