Signal generation method, system and device

Abstract

Provided are a signal generation method, system and device, applied to the technical field of communications, the method comprising: respectively generating a first optical carrier and a second optical carrier, the frequencies of the first optical carrier and the second optical carrier being different; the first optical carrier and N paths of user data are modulated, N optical signals are obtained, the N optical signals respectively carry orbital angular momentum OAM of different modes and different user data, and N is an integer larger than 1; coupling and heterodyne beat frequency are carried out on the second optical carrier and the N optical signals to obtain a terahertz signal, and the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier. According to the method, different modes of OAM are introduced into a terahertz signal, so that the spatial multiplexing dimension is increased, and the capacity of a terahertz communication system is improved.

Description

Technical Field

[0001] The present application relates to the field of communication technology, and in particular to a signal generation method, system and device. Background Art

[0002] Terahertz communication can achieve ultra-large bandwidth wireless communication and provide high-level transmission rate, which is suitable for short-distance high-speed wireless communication on the ground and satellite communication in space. Due to the large propagation loss of terahertz waves, directional antennas and large-scale antenna arrays are often required to obtain high gain. The terahertz frequency band has very high requirements for the structure and process of antennas. Mechanical antenna processes such as horn antennas are relatively mature and can produce good directional beams.

[0003] However, the horn antenna is a three-dimensional structure, which is not conducive to integration into the circuit, and the antenna size in the terahertz band is further reduced, which increases the cost and difficulty of the horn antenna manufacturing process. In addition, the terahertz channel is sparse, resulting in a lack of rank in the channel matrix. These are not conducive to the application of large-scale antenna arrays and limit the improvement of the capacity of terahertz communication systems. Summary of the invention

[0004] The embodiments of the present application provide a signal sending method, system and device to solve the problem of low communication system capacity in the existing signal sending method.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, an embodiment of the present application provides a signal generation method, the method comprising:

[0007] generating a first optical carrier and a second optical carrier respectively, wherein the first optical carrier has a different frequency from the second optical carrier;

[0008] Modulating the first optical carrier with N user data respectively to obtain N optical signals, wherein the N optical signals respectively carry orbital angular momentum OAM of different modes and different user data, and N is an integer greater than 1;

[0009] The second optical carrier is coupled and heterodyned with the N optical signals to obtain a terahertz signal, wherein the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

[0010] Optionally, the generating the first optical carrier and the second optical carrier respectively includes:

[0011] generating a first optical carrier of a first frequency using a first laser;

[0012] generating a second optical carrier of a second frequency using a second laser;

[0013] The frequency of the terahertz signal is equal to the difference between the second frequency and the first frequency.

[0014] Optionally, the generating the first optical carrier and the second optical carrier respectively includes:

[0015] Using N first lasers to generate N first optical carriers respectively, the frequency interval between every two adjacent first optical carriers is the same;

[0016] generating a second optical carrier of a second frequency using a second laser;

[0017] The modulating the first optical carrier with N channels of user data respectively includes:

[0018] respectively modulating the N first optical carriers and the N channels of user data in a one-to-one correspondence;

[0019] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N first optical carriers, and the center frequencies of the N first optical carriers are the average frequencies of the maximum frequency and the minimum frequency of the N first optical carriers.

[0020] Optionally, the generating the first optical carrier and the second optical carrier respectively includes:

[0021] Generate N+1 optical frequency comb carriers respectively by using a first laser, wherein N optical frequency comb carriers among the N+1 optical frequency comb carriers are used as first optical carriers, one optical frequency comb carrier other than the N optical frequency comb carriers among the N+1 optical frequency comb carriers is used as a second optical carrier, the frequency interval between every two adjacent optical frequency comb carriers among the N optical frequency comb carriers is the same, and the frequency of the one optical frequency comb carrier is the second frequency;

[0022] The modulating the first optical carrier with N channels of user data respectively includes:

[0023] respectively modulating the N optical frequency comb carriers and the N channels of user data in a one-to-one correspondence;

[0024] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N optical frequency comb carriers, and the center frequencies of the N optical frequency comb carriers are the average frequencies of the maximum frequency and the minimum frequency of the N optical frequency comb carriers.

[0025] Optionally, the modulating the first optical carrier with N channels of user data respectively to obtain N optical signals includes:

[0026] The first optical carrier and the N user data are modulated by N in-phase orthogonal IQ modulators and N spatial light modulators to obtain N OAM optical signals, wherein one IQ modulator and one spatial light modulator form a modulation channel for modulating one user data and the first optical carrier.

[0027] In a second aspect, an embodiment of the present application further provides a signal generating system, the system comprising:

[0028] A laser, N IQ modulators, N spatial light modulators, an optical coupler, and a high-speed detector, where N is an integer greater than 1, wherein:

[0029] The laser is used to generate a first optical carrier and a second optical carrier, wherein the first optical carrier has a different frequency from the second optical carrier;

[0030] The N optical modulators are used to perform IQ modulation on the first optical carrier and N channels of user data respectively to obtain N channels of IQ modulated signals;

[0031] The N spatial light modulators are used to perform OAM modulation on the N IQ modulated signals respectively to obtain N OAM optical signals, wherein the N optical signals respectively carry OAM of different modes and different user data;

[0032] The optical coupler is used to couple the N OAM optical signals with the second optical carrier to obtain an optically coupled signal;

[0033] The high-speed detector is used to perform heterodyne beat frequency on the optical coupling signal to obtain a terahertz signal, and the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

[0034] In a third aspect, an embodiment of the present application further provides a signal generating device, the device comprising:

[0035] A first generating module, configured to generate a first optical carrier and a second optical carrier respectively, wherein the first optical carrier has a different frequency from the second optical carrier;

[0036] A first modulation module, configured to modulate the first optical carrier with N user data respectively to obtain N optical signals, wherein the N optical signals respectively carry orbital angular momentum OAM of different modes and different user data, and N is an integer greater than 1;

[0037] The first processing module is used to couple and heterodyne the second optical carrier with the N optical signals to obtain a terahertz signal, wherein the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

[0038] Optionally, the first generating module includes:

[0039] A first generating unit, configured to generate a first optical carrier of a first frequency using a first laser;

[0040] A second generating unit, configured to generate a second optical carrier of a second frequency using a second laser;

[0041] The frequency of the terahertz signal is equal to the difference between the second frequency and the first frequency.

[0042] Optionally, the first generating module includes:

[0043] A third generating unit is used to generate N first optical carriers using the N first lasers respectively, and the frequency interval between every two adjacent first optical carriers is the same;

[0044] a fourth generating unit, configured to generate a second optical carrier of a second frequency by using a second laser;

[0045] The first modulation module includes:

[0046] A first modulation unit, configured to modulate the N first optical carriers and the N channels of user data in a one-to-one correspondence;

[0047] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N first optical carriers, and the center frequencies of the N first optical carriers are the average frequencies of the maximum frequency and the minimum frequency of the N first optical carriers.

[0048] Optionally, the first generating module includes:

[0049] a fifth generating unit, configured to generate N+1 optical frequency comb carriers respectively by using the first laser, wherein N optical frequency comb carriers among the N+1 optical frequency comb carriers are used as first optical carriers, one optical frequency comb carrier other than the N optical frequency comb carriers among the N+1 optical frequency comb carriers is used as a second optical carrier, the frequency interval between every two adjacent optical frequency comb carriers among the N optical frequency comb carriers is the same, and the frequency of the one optical frequency comb carrier is the second frequency;

[0050] The first modulation module includes:

[0051] A second modulation unit, used for modulating the N optical frequency comb carriers and the N channels of user data in a one-to-one correspondence;

[0052] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N optical frequency comb carriers, and the center frequencies of the N optical frequency comb carriers are the average frequencies of the maximum frequency and the minimum frequency of the N optical frequency comb carriers.

[0053] Optionally, the first modulation module includes:

[0054] The third modulation unit is used to modulate the first optical carrier and the N user data through N in-phase orthogonal IQ modulators and N spatial light modulators to obtain N OAM optical signals, wherein one IQ modulator and one spatial light modulator form a modulation channel for modulating one user data and the first optical carrier.

[0055] In a fourth aspect, an embodiment of the present application further provides a communication system, comprising a processor, a memory, and a computer program stored in the memory and executable on the processor, wherein the computer program implements the steps of the above-mentioned signal generation method when executed by the processor.

[0056] In a fifth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the steps of the above-mentioned signal generation method are implemented.

[0057] The signal generation method of the embodiment of the present application includes generating a first optical carrier and a second optical carrier respectively, wherein the frequencies of the first optical carrier and the second optical carrier are different; modulating the first optical carrier with N channels of user data respectively to obtain N optical signals, wherein the N optical signals respectively carry orbital angular momentum OAM of different modes and different user data, and N is an integer greater than 1; coupling and heterodyning the second optical carrier with the N optical signals to obtain a terahertz signal, wherein the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier. This method increases the spatial multiplexing dimension by introducing different modes of OAM in the terahertz signal, thereby improving the capacity of the terahertz communication system. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0059] Figure 1 is a flow chart of a signal generating method provided in an embodiment of the present application;

[0060] Figure 2 is one of the schematic diagrams of the signal generating system provided in the embodiment of the present application;

[0061] Figure 3This is the second schematic diagram of the signal generation system provided in the embodiment of the present application;

[0062] Figure 4 This is the third schematic diagram of the signal generating system provided in the embodiment of the present application;

[0063] Figure 5 is a structural diagram of a signal generating device provided by an embodiment of the present application;

[0064] Figure 6 It is a structural diagram of a communication system provided in one embodiment of the present application. DETAILED DESCRIPTION

[0065] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0066] The embodiment of the present application provides a signal generation method. It should be noted in advance that in the field of communications, the generation methods of terahertz signals mainly include electro-generation and photo-generation. The signal generation method of the embodiment of the present application is mainly photo-generation of terahertz. The specific process is: modulating the baseband data onto the optical carrier from the laser, and then coupling with the local oscillator laser. The coupled signal is heterodyned through a uni-traveling-carrier photodiode (UTC-PD) to achieve the conversion of optical signals to terahertz signals. See Figure 1 , Figure 1 is a flow chart of a signal generation method provided in an embodiment of the present application, such as Figure 1 As shown, the following steps are included:

[0067] Step 101: Generate a first optical carrier and a second optical carrier respectively, wherein the first optical carrier has a different frequency from the second optical carrier;

[0068] In this step, the optical carrier is an electromagnetic wave modulated in frequency, amplitude modulation or phase to transmit speech, music, images or other signals. The first optical carrier and the second optical carrier with different frequencies can be generated by different lasers.

[0069] Step 102: modulate the first optical carrier with N user data respectively to obtain N optical signals, wherein the N optical signals respectively carry orbital angular momentum OAM of different modes and different user data, and N is an integer greater than 1;

[0070] In this step, modulation can be understood as the process of mixing a low-energy message signal with a high-energy carrier signal to generate a high-energy signal. The generated signal can transmit the message to a far place. In this step, the first optical carrier is modulated with N channels of user data to obtain N optical signals. The N channels of user data can be understood as low-energy message signals, and the generated optical signals can be understood as high-energy signals. After modulation, the N optical signals also carry orbital angular momentum (OAM) of different modes, and OAM of different modes can carry multiple data channels, thereby realizing high-degree-of-freedom spatial multiplexing transmission under line-of-sight.

[0071] Step 103: Couple and heterodyne the second optical carrier with the N optical signals to obtain a terahertz signal, wherein the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

[0072] In this step, the second optical carrier is first coupled with N optical signals through an optical coupler, and the coupled signals are heterodyned through UTC-PD, so that the conversion of optical signals into terahertz signals can be realized. The frequency of the obtained terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

[0073] In one implementation, OAM with different modes is introduced in the process of generating terahertz signals. OAM with different modes can carry multi-channel data, which increases the spatial multiplexing dimension in the data transmission process, solves the problem of terahertz channel sparsity leading to lack of rank in the channel matrix, and thus improves the capacity of the terahertz communication system.

[0074] Optionally, the generating the first optical carrier and the second optical carrier respectively includes:

[0075] generating a first optical carrier of a first frequency using a first laser;

[0076] generating a second optical carrier of a second frequency using a second laser;

[0077] The frequency of the terahertz signal is equal to the difference between the second frequency and the first frequency.

[0078] In one embodiment, see Figure 2 , using a first laser to generate a first optical carrier with only one frequency component, the first optical carrier is divided into N channels, and the N channels of user data are respectively subjected to in-phase quadrature (IQ) modulation and OAM modulation to obtain N optical signals carrying different modal OAMs and different user data, Figure 2 The spatial light modulator in the system is used for OAM modulation.

[0079] A second laser is used to generate a second optical carrier with a frequency different from that of the first optical carrier. After N optical signals are coupled to the second optical carrier through an optical coupler, heterodyne beat frequency is performed through UTC-PD to obtain a terahertz signal. The frequency of the terahertz signal is the difference between the second frequency of the second optical carrier and the first frequency of the first optical carrier.

[0080] In this implementation, a first optical carrier with a single frequency is generated by a first laser, and a second optical carrier with a second frequency is generated by a second laser, which is beneficial for subsequently generating a terahertz signal based on the first optical carrier and the second optical carrier.

[0081] Optionally, the generating the first optical carrier and the second optical carrier respectively includes:

[0082] Using N first lasers to generate N first optical carriers respectively, the frequency interval between every two adjacent first optical carriers is the same;

[0083] generating a second optical carrier of a second frequency using a second laser;

[0084] The modulating the first optical carrier with N channels of user data respectively includes:

[0085] respectively modulating the N first optical carriers and the N channels of user data in a one-to-one correspondence;

[0086] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N first optical carriers, and the center frequencies of the N first optical carriers are the average frequencies of the maximum frequency and the minimum frequency of the N first optical carriers.

[0087] In one embodiment, see Figure 3 , N lasers are used to generate N first optical carriers, and the frequency interval between every two adjacent first optical carriers is the same. Then, after the N first optical carriers are IQ modulated and OAM modulated by N user data, N optical signals carrying different modal OAMs and different user data are obtained. Figure 3 The spatial light modulator in the system is used for OAM modulation.

[0088] The second optical carrier is generated by the second laser, and the N optical signals are coupled to the second optical carrier through an optical coupler, and then heterodyne beat frequency is performed through UTC-PD to obtain a terahertz signal, the frequency of which is the difference between the second frequency of the second optical carrier and the average frequency of the maximum frequency and the minimum frequency of the N first optical carriers. It should be noted that the frequency interval between each two adjacent first optical carriers is much smaller than the frequency of the first optical carrier.

[0089] In this implementation, N first optical carriers with the same frequency interval are generated by N lasers, and a second optical carrier with a second frequency is generated by a second laser, which is conducive to the subsequent generation of terahertz signals based on the N first optical carriers and the second optical carriers.

[0090] Optionally, the generating the first optical carrier and the second optical carrier respectively includes:

[0091] Generate N+1 optical frequency comb carriers respectively by using a first laser, wherein N optical frequency comb carriers among the N+1 optical frequency comb carriers are used as first optical carriers, one optical frequency comb carrier other than the N optical frequency comb carriers among the N+1 optical frequency comb carriers is used as a second optical carrier, the frequency interval between every two adjacent optical frequency comb carriers among the N optical frequency comb carriers is the same, and the frequency of the one optical frequency comb carrier is the second frequency;

[0092] The modulating the first optical carrier with N channels of user data respectively includes:

[0093] respectively modulating the N optical frequency comb carriers and the N channels of user data in a one-to-one correspondence;

[0094] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N optical frequency comb carriers, and the center frequencies of the N optical frequency comb carriers are the average frequencies of the maximum frequency and the minimum frequency of the N optical frequency comb carriers.

[0095] In one embodiment, see Figure 4 , using a first laser to generate N+1 optical frequency comb carriers respectively, the specific generation method can be a mode laser method, an optoelectronic modulator method, a micro-resonant cavity method, etc., taking N optical frequency comb carriers among the N+1 optical frequency comb carriers as the first optical carrier, and the frequency interval between each two adjacent optical frequency comb carriers among the N optical frequency comb carriers is the same, and the N optical frequency comb carriers are respectively IQ modulated and OAM modulated by N user data, so as to obtain N optical signals carrying different modal OAMs and different user data, Figure 4 The spatial light modulator in the optical frequency comb is used for OAM modulation. It should be noted that the frequency interval between each two adjacent optical frequency comb carriers is much smaller than the frequency of the optical frequency comb carrier.

[0096] One optical frequency comb carrier other than the N optical frequency comb carriers among the N+1 optical frequency comb carriers is used as the second optical carrier. It should be noted that this optical frequency comb carrier will not be modulated, so it does not carry user data and OAM. After the N optical signals are coupled with the second optical carrier through an optical coupler, they are heterodyned and beat through UTC-PD to obtain a terahertz signal. The frequency of the terahertz signal is the difference between the second frequency of the second optical carrier and the average frequency of the maximum frequency and the minimum frequency among the N first optical carriers.

[0097] In this implementation, N+1 optical frequency comb carriers are generated respectively by the first laser, N of the optical frequency comb carriers are used as the first optical carrier, and one optical frequency comb carrier other than the N optical frequency comb carriers among the N+1 optical frequency comb carriers is used as the second optical carrier, which is beneficial for subsequently generating a terahertz signal according to the first optical carrier and the second optical carrier.

[0098] Optionally, the modulating the first optical carrier with N channels of user data respectively to obtain N optical signals includes:

[0099] The first optical carrier and the N user data are modulated by N in-phase orthogonal IQ modulators and N spatial light modulators to obtain N OAM optical signals, wherein one IQ modulator and one spatial light modulator form a modulation channel for modulating one user data and the first optical carrier.

[0100] In one implementation, the first optical carrier is respectively subjected to in-phase quadrature (IQ) modulation and OAM modulation by N channels of user data to obtain N optical signals carrying different modal OAMs and different user data. Different modal OAMs can carry multiple channels of data, thereby realizing high-degree-of-freedom spatial multiplexing transmission under line-of-sight.

[0101] See also Figure 2 , Figure 3 and Figure 4 , a schematic diagram of a signal generation system provided in an embodiment of the present application, the signal generation system includes a laser, N IQ modulators, N spatial light modulators, an optical coupler and a high-speed detector, N is an integer greater than 1, wherein:

[0102] The laser is used to generate a first optical carrier and a second optical carrier, wherein the first optical carrier has a different frequency from the second optical carrier;

[0103] The N optical modulators are used to perform IQ modulation on the first optical carrier and N channels of user data respectively to obtain N channels of IQ modulated signals;

[0104] The N spatial light modulators are used to perform OAM modulation on the N IQ modulated signals respectively to obtain N OAM optical signals, wherein the N optical signals respectively carry different orbital angular momentum OAM modes and different user data;

[0105] The optical coupler is used to couple the N OAM optical signals with the second optical carrier to obtain an optically coupled signal;

[0106] The high-speed detector is used to perform heterodyne beat frequency on the optical coupling signal to obtain a terahertz signal, and the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

[0107] The specific implementation of the signal generation system of the embodiment of the present application can refer to the relevant introduction in the above embodiment, and will not be repeated here to avoid repetition. The signal generation system introduces different modes of OAM in the terahertz signal to increase the spatial multiplexing dimension, thereby improving the capacity of the terahertz communication system.

[0108] See also Figure 5 , Figure 5 It is a structural diagram of a signal generating device provided in one embodiment of the present application.

[0109] like Figure 5 As shown, the signal generating device 500 includes:

[0110] A first generating module 501 is configured to generate a first optical carrier and a second optical carrier respectively, wherein the first optical carrier has a different frequency from the second optical carrier;

[0111] A first modulation module 502 is configured to modulate the first optical carrier with N user data to obtain N optical signals, wherein the N optical signals carry different orbital angular momentum OAM modes and different user data, respectively, and N is an integer greater than 1;

[0112] The first processing module 503 is used to couple and heterodyne the second optical carrier with the N optical signals to obtain a terahertz signal, wherein the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

[0113] Optionally, the first generating module includes:

[0114] A first generating unit, configured to generate a first optical carrier of a first frequency using a first laser;

[0115] A second generating unit, configured to generate a second optical carrier of a second frequency using a second laser;

[0116] The frequency of the terahertz signal is equal to the difference between the second frequency and the first frequency.

[0117] Optionally, the first generating module includes:

[0118] A third generating unit is used to generate N first optical carriers using the N first lasers respectively, and the frequency interval between every two adjacent first optical carriers is the same;

[0119] a fourth generating unit, configured to generate a second optical carrier of a second frequency by using a second laser;

[0120] The first modulation module includes:

[0121] A first modulation unit, configured to modulate the N first optical carriers and the N channels of user data in a one-to-one correspondence;

[0122] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N first optical carriers, and the center frequencies of the N first optical carriers are the average frequencies of the maximum frequency and the minimum frequency of the N first optical carriers.

[0123] Optionally, the first generating module includes:

[0124] a fifth generating unit, configured to generate N+1 optical frequency comb carriers respectively by using the first laser, wherein N optical frequency comb carriers among the N+1 optical frequency comb carriers are used as first optical carriers, one optical frequency comb carrier other than the N optical frequency comb carriers among the N+1 optical frequency comb carriers is used as a second optical carrier, the frequency interval between every two adjacent optical frequency comb carriers among the N optical frequency comb carriers is the same, and the frequency of the one optical frequency comb carrier is the second frequency;

[0125] The first modulation module includes:

[0126] A second modulation unit, used for modulating the N optical frequency comb carriers and the N channels of user data in a one-to-one correspondence;

[0127] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N optical frequency comb carriers, and the center frequencies of the N optical frequency comb carriers are the average frequencies of the maximum frequency and the minimum frequency of the N optical frequency comb carriers.

[0128] Optionally, the first modulation module includes:

[0129] The third modulation unit is used to modulate the first optical carrier and the N user data through N in-phase orthogonal IQ modulators and N spatial light modulators to obtain N OAM optical signals, wherein one IQ modulator and one spatial light modulator form a modulation channel for modulating one user data and the first optical carrier.

[0130] See also Figure 6 , Figure 6 is a structural diagram of a communication system provided in an embodiment of the present application, such as Figure 6As shown, the communication system includes: a processor 600, a memory 620, and a program or instruction stored in the memory 620 and executable on the processor 600, the processor 600 is used to read the program or instruction in the memory 620; the communication system also includes a bus interface and a transceiver 610.

[0131] The transceiver 610 is configured to receive and send data under the control of the processor 600 .

[0132] Among them, Figure 6 In the embodiment, the bus architecture may include any number of interconnected buses and bridges, specifically linking together various circuits of one or more processors represented by processor 600 and memory represented by memory 620. The bus architecture may also link together various other circuits such as peripherals, voltage regulators, and power management circuits, which are well known in the art and are therefore not further described herein. The bus interface provides an interface. The transceiver 610 may be a plurality of components, namely, a transmitter and a transceiver, providing a unit for communicating with various other devices on a transmission medium. The processor 600 is responsible for managing the bus architecture and general processing, and the memory 620 may store data used by the processor 600 when performing operations.

[0133] The processor 600 is used to read the program or instruction in the memory 620 and execute the following steps:

[0134] generating a first optical carrier and a second optical carrier respectively, wherein the first optical carrier has a different frequency from the second optical carrier;

[0135] Modulating the first optical carrier with N user data respectively to obtain N optical signals, wherein the N optical signals respectively carry different orbital angular momentum OAM modes and different user data, and N is an integer greater than 1;

[0136] The second optical carrier is coupled and heterodyned with the N optical signals to obtain a terahertz signal, wherein the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

[0137] Optionally, the processor 600 is configured to read a program or instruction in the memory 620 and perform the following steps:

[0138] generating a first optical carrier of a first frequency using a first laser;

[0139] generating a second optical carrier of a second frequency using a second laser;

[0140] The frequency of the terahertz signal is equal to the difference between the second frequency and the first frequency.

[0141] Optionally, the processor 600 is configured to read a program or instruction in the memory 620 and perform the following steps:

[0142] Using N first lasers to generate N first optical carriers respectively, the frequency interval between every two adjacent first optical carriers is the same;

[0143] generating a second optical carrier of a second frequency using a second laser;

[0144] The processor 600 is used to read the program or instruction in the memory 620 and execute the following steps:

[0145] respectively modulating the N first optical carriers and the N channels of user data in a one-to-one correspondence;

[0146] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N first optical carriers, and the center frequencies of the N first optical carriers are the average frequencies of the maximum frequency and the minimum frequency of the N first optical carriers.

[0147] Optionally, the processor 600 is configured to read a program or instruction in the memory 620 and perform the following steps:

[0148] Generate N+1 optical frequency comb carriers respectively by using a first laser, wherein N optical frequency comb carriers among the N+1 optical frequency comb carriers are used as first optical carriers, one optical frequency comb carrier other than the N optical frequency comb carriers among the N+1 optical frequency comb carriers is used as a second optical carrier, the frequency interval between every two adjacent optical frequency comb carriers among the N optical frequency comb carriers is the same, and the frequency of the one optical frequency comb carrier is the second frequency;

[0149] The processor 600 is used to read the program or instruction in the memory 620 and execute the following steps:

[0150] respectively modulating the N optical frequency comb carriers and the N channels of user data in a one-to-one correspondence;

[0151] The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N optical frequency comb carriers, and the center frequencies of the N optical frequency comb carriers are the average frequencies of the maximum frequency and the minimum frequency of the N optical frequency comb carriers.

[0152] Optionally, the processor 600 is configured to read a program or instruction in the memory 620 and perform the following steps:

[0153] The first optical carrier and the N user data are modulated by N in-phase orthogonal IQ modulators and N spatial light modulators to obtain N OAM optical signals, wherein one IQ modulator and one spatial light modulator form a modulation channel for modulating one user data and the first optical carrier.

[0154] The embodiment of the present application also provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, each process of the above-mentioned signal generation method embodiment is implemented, and the same technical effect can be achieved. To avoid repetition, it is not repeated here. The computer-readable storage medium is, for example, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0155] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or device including the element.

[0156] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal (which can be a mobile phone, a computer, a server, an air conditioner, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0157] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A signal generation method, characterized in that: include: generating a first optical carrier and a second optical carrier respectively, wherein the first optical carrier has a different frequency from the second optical carrier; Modulating the first optical carrier with N user data respectively to obtain N optical signals, wherein the N optical signals respectively carry orbital angular momentum OAM of different modes and different user data, and N is an integer greater than 1; The second optical carrier is coupled and heterodyned with the N optical signals to obtain a terahertz signal, wherein the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

2. The signal generation method according to claim 1, characterized in that: The generating the first optical carrier and the second optical carrier respectively comprises: generating a first optical carrier of a first frequency using a first laser; generating a second optical carrier of a second frequency using a second laser; The frequency of the terahertz signal is equal to the difference between the second frequency and the first frequency.

3. The signal generating method according to claim 1, characterized in that: The generating the first optical carrier and the second optical carrier respectively comprises: Using N first lasers to generate N first optical carriers respectively, the frequency interval between every two adjacent first optical carriers is the same; generating a second optical carrier of a second frequency using a second laser; The modulating the first optical carrier with N channels of user data respectively includes: respectively modulating the N first optical carriers and the N channels of user data in a one-to-one correspondence; The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N first optical carriers, and the center frequencies of the N first optical carriers are the average frequencies of the maximum frequency and the minimum frequency of the N first optical carriers.

4. The signal generating method according to claim 1, characterized in that: The generating the first optical carrier and the second optical carrier respectively comprises: Generate N+1 optical frequency comb carriers respectively by using a first laser, wherein N optical frequency comb carriers among the N+1 optical frequency comb carriers are used as first optical carriers, one optical frequency comb carrier among the N+1 optical frequency comb carriers except the N optical frequency comb carriers is used as a second optical carrier, the frequency interval between every two adjacent optical frequency comb carriers among the N optical frequency comb carriers is the same, and the frequency of the one optical frequency comb carrier is the second frequency; The modulating the first optical carrier with N channels of user data respectively includes: respectively modulating the N optical frequency comb carriers and the N channels of user data in a one-to-one correspondence; The frequency of the terahertz signal is equal to the difference between the second frequency and the center frequencies of the N optical frequency comb carriers, and the center frequencies of the N optical frequency comb carriers are the average frequencies of the maximum frequency and the minimum frequency of the N optical frequency comb carriers.

5. The signal generating method according to any one of claims 1 to 4, characterized in that: The step of modulating the first optical carrier with N user data to obtain N optical signals includes: The first optical carrier and the N user data are modulated by N in-phase orthogonal IQ modulators and N spatial light modulators to obtain N OAM optical signals, wherein one IQ modulator and one spatial light modulator form a modulation channel for modulating one user data and the first optical carrier.

6. A signal generation system, characterized in that: The signal generation system includes a laser, N IQ modulators, N spatial light modulators, an optical coupler and a high-speed detector, where N is an integer greater than 1, wherein: The laser is used to generate a first optical carrier and a second optical carrier, wherein the first optical carrier has a different frequency from the second optical carrier; The N optical modulators are used to perform IQ modulation on the first optical carrier and N channels of user data respectively to obtain N channels of IQ modulated signals; The N spatial light modulators are used to perform OAM modulation on the N IQ modulated signals respectively to obtain N OAM optical signals, wherein the N optical signals respectively carry OAM of different modes and different user data; The optical coupler is used to couple the N OAM optical signals with the second optical carrier to obtain an optically coupled signal; The high-speed detector is used to perform heterodyne beat frequency on the optical coupling signal to obtain a terahertz signal, and the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

7. A signal generating device, characterized in that: The device comprises: A first generating module, configured to generate a first optical carrier and a second optical carrier respectively, wherein the first optical carrier has a different frequency from the second optical carrier; A first modulation module, configured to modulate the first optical carrier with N user data respectively to obtain N optical signals, wherein the N optical signals respectively carry orbital angular momentum OAM of different modes and different user data, and N is an integer greater than 1; The first processing module is used to couple and heterodyne the second optical carrier with the N optical signals to obtain a terahertz signal, wherein the frequency of the terahertz signal is related to the frequency difference between the first optical carrier and the second optical carrier.

8. The signal generating device according to claim 7, characterized in that: The first generating module comprises: A first generating unit, configured to generate a first optical carrier of a first frequency using a first laser; A second generating unit, configured to generate a second optical carrier of a second frequency using a second laser; The frequency of the terahertz signal is equal to the difference between the second frequency and the first frequency.

9. A communication system, characterized in that: The method comprises a processor, a memory and a computer program stored in the memory and executable on the processor, wherein the computer program implements the steps of the signal generating method according to any one of claims 1 to 5 when executed by the processor.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the signal generating method according to any one of claims 1 to 5 are implemented.

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