CN113572525B

CN113572525B - Communication method and system

Info

Publication number: CN113572525B
Application number: CN202010350772.3A
Authority: CN
Inventors: 张军平
Original assignee: Huawei Technologies Co Ltd
Current assignee: Huawei Technologies Co Ltd
Priority date: 2020-04-28
Filing date: 2020-04-28
Publication date: 2022-11-04
Anticipated expiration: 2040-04-28
Also published as: WO2021218998A1; CN113572525A

Abstract

A communication method and system, the system includes network equipment and one or more terminal equipments, the network equipment includes the launcher, modulator and diffraction grating, any terminal equipment in one or more terminal equipments includes the reflector, photodetector and demodulator; the transmitter transmits first resonant light according to information to be transmitted, wherein the information comprises first information, and the first information is information transmitted to first terminal equipment; the modulator modulates information of different terminal devices in the information to be transmitted to light waves with different wavelengths in the first resonant light to obtain second resonant light; the diffraction grating radiates the second resonant light to a different direction; the reflector transmits part of the third resonant light to obtain first laser light, and the third resonant light is resonant light radiated in the direction of the first terminal equipment in the second resonant light; the photoelectric detector converts the first laser into a first electric signal; the demodulator demodulates the first electrical signal to obtain first information. The embodiment of the invention can improve the bandwidth utilization rate of the system.

Description

Communication method and system

Technical Field

The embodiment of the invention relates to the technical field of communication, in particular to a communication method and a communication system.

Background

Wireless optical communication technology is the product of a combination of optical and wireless communications. Because light has abundant bandwidth resources, the wireless optical communication technology has great application prospect. During the communication process, there may be a plurality of users needing to communicate. Currently, in wireless optical communication, a plurality of users can access a wireless optical communication system by time division multiplexing. However, when accessing the wireless optical communication system by time division multiplexing, once a terminal device accesses the communication system, other terminal devices need to wait for the terminal device to access after the terminal device is used up, so that only one terminal device can use the whole system bandwidth at the same time, and a single user cannot use the whole bandwidth enough, thereby reducing the bandwidth utilization rate of the system.

Disclosure of Invention

The embodiment of the invention discloses a communication method and a communication system, which are used for improving the bandwidth utilization rate of a system.

A first aspect discloses a communication system, which may include a network device and one or more terminal devices, the network device may include a transmitter, a first modulator, and a diffraction grating, the first terminal device may include a first reflector, a first photodetector, and a first demodulator, and the first terminal device is any one of the one or more terminal devices. And the transmitter is used for transmitting the first resonant light according to information to be transmitted, wherein the information to be transmitted comprises first information, and the first information is information required to be transmitted to the first terminal equipment. And the first modulator is used for modulating information of different terminal devices in the information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light. And a diffraction grating for radiating the second resonant light to a different direction by wavelength. And a first reflector for transmitting a part of the third resonant light to obtain the first laser light, the third resonant light being the resonant light of the second resonant light radiated in the direction of the first terminal device. And a first photodetector for converting the first laser light into a first electrical signal. A first demodulator for demodulating the first electrical signal to obtain first information.

In the communication system disclosed in the embodiment of the present invention, the network device may modulate information to be transmitted to different terminal devices onto the light waves with different wavelengths in the resonant light transmitted by the transmitter through the modulator, and the diffraction grating may radiate the light waves with different wavelengths to different directions, so that the terminal devices in different directions may receive the resonant light radiated to the direction in which the terminal device is located, so that the terminal device may obtain the information transmitted by the network device through the laser transmitted by the reflector. Therefore, a plurality of terminal devices can use light waves with different wavelengths to simultaneously communicate with the network device, and therefore, the bandwidth utilization rate of the system can be improved. In addition, the network device can radiate the light waves with different wavelengths to different directions, and the interference between the light waves with different wavelengths is small, so that the mutual interference between a plurality of terminal devices during simultaneous communication can be reduced.

As a possible implementation, the first terminal device may further include a second modulator, and the network device may further include a second reflector, a second photodetector, and a second demodulator; the first reflector is also used for reflecting fourth resonant light, and the fourth resonant light is resonant light except the first laser light in the third resonant light; a second modulator for modulating second information to the fourth resonance light to obtain fifth resonance light, emitting the fifth resonance light; a second reflector for transmitting part of the fifth resonant light to obtain a second laser light; a second photodetector for converting the second laser light into a second electrical signal; a second demodulator for demodulating the second electrical signal to obtain second information.

In the communication system disclosed in the embodiment of the present invention, after receiving the resonant light from the network device, the terminal device may modulate the information that needs to be sent to the network device into the resonant light reflected by the reflector and send the modulated information to the network device, so that the network device may obtain the information sent by the terminal device through the laser light transmitted by the reflector. Therefore, when the terminal device communicates with the network device, the terminal device modulates the information to be transmitted into the resonant light transmitted by the network device and transmits the modulated information to the terminal device, and therefore the terminal device does not need to be provided with a laser light source, and the power consumption of the terminal device can be reduced. In addition, because terminal equipment does not need to set up laser light source, consequently, can avoid the laser because the great injury that causes to people's glasses of power to can further improve the transmission distance of information.

As a possible implementation, the network device may further include an excitation source; and the excitation source is used for generating an excitation signal according to the information to be transmitted. The transmitter transmits the first resonant light according to information to be transmitted, and comprises: the transmitter transmits the first resonant light according to the excitation signal.

In the communication system disclosed by the embodiment of the invention, the network equipment is provided with the excitation source, so that when the network equipment needs to send information, the excitation source can generate the excitation signal, and the emitter can emit the resonant light according to the excitation signal. Therefore, the laser arranged between the network equipment and the terminal equipment is controlled by the excitation source to work, and the excitation source can generate an excitation signal when information is sent, so that the laser can work when the communication system needs to transmit the information, the laser does not work when the information does not need to be transmitted, and the control force of the communication system can be improved. In addition, the power consumption of the network device can be reduced.

As a possible implementation manner, the network device may further include a first baseband transmission module, and the first terminal device may further include a first baseband reception module; the first baseband sending module is used for processing information to be sent to obtain a first baseband signal; the transmitter transmits the first resonant light according to information to be transmitted, and comprises: the transmitter transmits first resonant light according to the first baseband signal; the first modulator modulates information of different terminal devices in information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light, and the second modulator comprises the following steps: the first modulator modulates baseband signals of different terminal devices in the first baseband signal onto light waves with different wavelengths in the first resonant light to obtain second resonant light; the first demodulator demodulating the first electrical signal to obtain the first information includes: a first demodulator demodulates the first electrical signal to obtain a first baseband signal; the first baseband receiving module is used for processing the first baseband signal to obtain first information.

In the communication system disclosed in the embodiment of the present invention, the network device is provided with the baseband transmission module, the baseband transmission module can perform modulation, encoding, and other processing on information to be transmitted to obtain a baseband signal, and the reliability of the baseband signal is high in the transmission process, so that the reliability of information transmission can be improved.

As a possible implementation manner, the network device may further include a second baseband receiving module, and the first terminal device may further include a second baseband transmitting module; the second baseband sending module is used for processing the second information to obtain a second baseband signal; the second modulator modulating the second information to the fourth resonance light to obtain a fifth resonance light includes: the second modulator modulates the second baseband signal to the fourth resonance light to obtain fifth resonance light; the second demodulator demodulating the second electrical signal to obtain the second information includes: the second demodulator demodulates the second electrical signal to obtain a second baseband signal; and the second baseband receiving module is used for processing the second baseband signal to obtain second information.

In the communication system disclosed by the embodiment of the invention, the terminal equipment is provided with the baseband sending module, the baseband sending module can modulate, encode and the like the information to be sent to obtain the baseband signal, and the reliability of the baseband signal is higher in the transmission process, so that the reliability of information transmission can be improved.

As a possible implementation, the network device may further include a gain medium; a gain medium for amplifying power of the second resonant light to obtain sixth resonant light; the diffraction grating radiating the second resonant light in different directions by wavelength includes: the diffraction grating radiates the sixth resonant light to different directions according to the wavelength; the third resonant light is resonant light radiated in a direction in which the first terminal device is located in the second resonant light, and includes: the third resonant light is resonant light radiated in a direction in which the first terminal device is located among the sixth resonant light.

In the communication system disclosed in the embodiment of the present invention, the transmission distance of light is related to the power of light, and the larger the power of light is, the farther the transmission distance of light is. The network device is provided with the gain medium, and the gain medium can amplify the power of light, so that the sufficient transmission distance of the light can be ensured, the reliability of light transmission can be ensured, and the reliability of a communication system can be further improved.

As a possible implementation, the network device may further include a gain medium; a gain medium for amplifying power of the second resonant light radiated to a different direction to obtain seventh resonant light; the third resonant light is resonant light of the second resonant light radiated in a direction in which the first terminal device is located, and includes: the third resonant light is resonant light radiated in a direction in which the first terminal device is located among the seventh resonant light.

In the communication system disclosed in the embodiment of the present invention, the transmission distance of light is related to the power of light, and the larger the power of light is, the farther the transmission distance of light is. The network equipment is provided with the gain medium, the gain medium can amplify the power of light, and the light can be ensured to have enough transmission distance, so that the reliability of light transmission can be ensured, and the reliability of a communication system can be further improved.

As a possible implementation manner, the network device may further include a first alignment measurement module, and the terminal device may further include a second alignment measurement module; a first alignment measurement module for generating a first measurement signal; a transmitter for transmitting the eighth resonant light according to the first measurement signal; a first modulator for modulating the first measurement signal to the eighth resonating light to obtain ninth resonating light; a diffraction grating for radiating the ninth resonant light to a different direction by wavelength; the first reflector is further used for reflecting tenth resonant light, wherein the tenth resonant light is part of the ninth resonant light radiated in the resonant light in the direction of the first terminal equipment; a second alignment measurement module for generating a second measurement signal; a second modulator for modulating a second measurement signal to the tenth resonance light to obtain eleventh resonance light; a second reflector for transmitting part of the eleventh resonant light to obtain a third laser light; the second photoelectric detector is also used for converting the third laser into a third electric signal; a second demodulator further for demodulating the third electrical signal to obtain a second measurement signal; and the first alignment measurement module is also used for adjusting the transmission angle of the transmitter according to the signal quality of the second measurement signal.

In the communication system disclosed in the embodiment of the invention, before the network device communicates with the terminal device, alignment is required to be performed so that light radiated by the network device can be accurately radiated to the terminal device, thereby ensuring the reliability of communication between the network device and the terminal device.

A second aspect discloses a communication method applied to a communication system, which may include a network device and one or more terminal devices, the communication method may include: the network equipment transmits first resonant light according to information to be transmitted, modulates information of different terminal equipment in the information to be transmitted to light waves with different wavelengths in the first resonant light to obtain second resonant light, and radiates the second resonant light to different directions according to the wavelengths, wherein the information to be transmitted can comprise the first information, the first information is the information needing to be transmitted to the first terminal equipment, and the first terminal equipment is any one of one or more terminal equipment; the first terminal device transmits a part of the third resonant light to obtain first laser light, converts the first laser light into a first electric signal, demodulates the first electric signal to obtain first information, and the third resonant light is resonant light of the second resonant light radiated in a direction in which the first terminal device is located.

According to the communication method disclosed by the embodiment of the invention, the network equipment can modulate information to be sent to different terminal equipment onto the light waves with different wavelengths in the emitted resonant light and can radiate the light waves with different wavelengths to different directions, so that the terminal equipment in different directions can receive the resonant light radiated to the direction of the terminal equipment, and the terminal equipment can obtain the information sent by the network equipment through the transmitted laser. Therefore, a plurality of terminal devices can use light waves with different wavelengths to simultaneously communicate with the network device, and therefore, the bandwidth utilization rate of the system can be improved. In addition, the network device can radiate the light waves with different wavelengths to different directions, and the interference between the light waves with different wavelengths is small, so that the mutual interference between a plurality of terminal devices during simultaneous communication can be reduced.

As a possible implementation, the method may further include: the first terminal equipment reflects the fourth resonant light, modulates second information into the fourth resonant light to obtain fifth resonant light, and emits the fifth resonant light, wherein the fourth resonant light is the resonant light except the first laser light in the third resonant light; the network device transmits a part of the fifth resonant light to obtain a second laser, converts the second laser into a second electric signal, and demodulates the second electric signal to obtain second information.

According to the communication method disclosed by the embodiment of the invention, after the terminal equipment receives the resonant light from the network equipment, the information required to be sent to the network equipment can be modulated into the reflected resonant light and sent to the network equipment, so that the network equipment can obtain the information sent by the terminal equipment through the transmitted laser. Therefore, the terminal device does not need to be provided with a laser light source, and the power consumption of the terminal device can be reduced. In addition, because terminal equipment does not need to set up laser light source, consequently, can avoid the laser because the great damage that causes people's glasses of power to can further improve the transmission distance of information.

As a possible implementation, the network device emitting the first resonant light according to the information to be transmitted includes: the network equipment generates an excitation signal according to the information to be transmitted, and transmits first resonant light according to the excitation signal.

According to the communication method disclosed by the embodiment of the invention, when the network equipment needs to send information, the excitation signal can be generated, so that the resonant light can be emitted according to the excitation signal. Therefore, the communication between the network equipment and the terminal equipment is controlled by the excitation signal, and the excitation signal is generated when information is sent, so that the communication system can be ensured to work when the information needs to be transmitted, the communication system does not work when the information does not need to be transmitted, and the control force of the communication system can be improved. In addition, the power consumption of the network device can be reduced.

As a possible implementation, the network device emits the first resonant light according to the information to be transmitted, and the modulating information of different terminal devices in the information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain the second resonant light includes: the network equipment processes information to be sent to obtain a first baseband signal, transmits first resonant light according to the first baseband signal, and modulates baseband signals of different terminal equipment in the first baseband signal onto optical waves with different wavelengths in the first resonant light to obtain second resonant light; the first terminal device demodulating the first electrical signal to obtain the first information includes: the first terminal device demodulates the first electrical signal to obtain a first baseband signal, and processes the first baseband signal to obtain first information.

According to the communication method disclosed by the embodiment of the invention, before the network equipment sends the information to be sent, the information to be sent can be modulated, coded and the like to obtain the baseband signal, and the reliability of the baseband signal is higher in the transmission process, so that the reliability of information transmission can be improved.

As one possible embodiment, the first terminal device modulating the second information to the fourth resonance light to obtain the fifth resonance light includes: the first terminal equipment processes the second information to obtain a second baseband signal, and modulates the second baseband signal to fourth resonant light to obtain fifth resonant light; the network device demodulating the second electrical signal to obtain the second information includes: the network device demodulates the second electrical signal to obtain a second baseband signal, and processes the second baseband signal to obtain second information.

According to the communication method disclosed by the embodiment of the invention, before the terminal equipment sends the information to be sent, the information to be sent can be modulated, coded and the like to obtain the baseband signal, and the reliability of the baseband signal is higher in the transmission process, so that the reliability of information transmission can be improved.

As a possible embodiment, the network device radiating the second resonant light to different directions by wavelength comprises: the network equipment amplifies the power of the second resonant light to obtain sixth resonant light, and radiates the sixth resonant light to different directions according to the wavelength; the third resonant light is resonant light radiated in a direction in which the first terminal device is located in the second resonant light, and includes: the third resonant light is resonant light of the sixth resonant light radiated in a direction in which the first terminal device is located.

In the communication method disclosed by the embodiment of the invention, the transmission distance of light is related to the power of light, and the larger the power of light is, the farther the transmission distance of light is. The power of the resonant light can be amplified before the resonant light is radiated by the network equipment, and the light can be ensured to have enough transmission distance, so that the reliability of light transmission can be ensured, and the reliability of a communication system can be further improved.

As a possible implementation, the communication method may further include: the network device amplifies power of the second resonant light radiated to different directions to obtain seventh resonant light; the third resonant light is resonant light radiated in a direction in which the first terminal device is located in the second resonant light, and includes: the third resonant light is resonant light radiated in a direction in which the first terminal device is located among the seventh resonant light.

As a possible implementation, the network device may include an emitter for emitting the resonant light, and the communication method may further include: the network device generates a first measurement signal, emits eighth resonant light according to the first measurement signal, modulates the first measurement signal to the eighth resonant light to obtain ninth resonant light, and radiates the ninth resonant light to a different direction according to the wavelength; the first terminal device reflects the tenth resonant light, generates a second measurement signal, and modulates the second measurement signal to the tenth resonant light to obtain eleventh resonant light, wherein the tenth resonant light is part of the ninth resonant light radiated in the direction of the first terminal device; the network device transmits part of the eleventh resonant light to obtain third laser light, converts the third laser light into a third electric signal, demodulates the third electric signal to obtain a second measuring signal, and adjusts the emission angle of the emitter according to the signal quality of the second measuring signal.

According to the communication method disclosed by the embodiment of the invention, before the network equipment and the terminal equipment are communicated, alignment is required to be carried out so that the light radiated by the network equipment can be accurately radiated to the terminal equipment, and therefore, the reliability of communication between the network equipment and the terminal equipment can be ensured.

A third aspect discloses a communication method, which is applied to a network device that communicates with one or more terminal devices, and may include: the method comprises the steps that first resonant light is emitted according to information to be sent, the information to be sent comprises first information, the first information is information needing to be sent to first terminal equipment, and the first terminal equipment is any one of one or more terminal equipment; modulating information of different terminal devices in information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light; radiating second resonant light to different directions according to wavelength, wherein the second resonant light is used for transmitting part of resonant light in third resonant light by the first terminal equipment to obtain first laser, converting the first laser into a first electric signal, and demodulating the first electric signal to obtain first information, and the third resonant light is resonant light radiated in the direction of the first terminal equipment in the second resonant light.

According to the communication method disclosed by the embodiment of the invention, the network equipment can modulate information required to be sent to different terminal equipment onto the light waves with different wavelengths in the emitted resonant light and can radiate the light waves with different wavelengths to different directions, so that the terminal equipment in different directions can receive the resonant light radiated to the direction of the terminal equipment, and the terminal equipment can obtain the information sent by the network equipment through the transmitted laser. Therefore, a plurality of terminal devices can use light waves with different wavelengths to simultaneously communicate with the network device, and therefore, the bandwidth utilization rate of the system can be improved. In addition, the network device can radiate the light waves with different wavelengths to different directions, and the interference between the light waves with different wavelengths is small, so that the mutual interference between a plurality of terminal devices during simultaneous communication can be reduced.

As a possible implementation manner, the second resonant light is further used for the first terminal device to reflect the fourth resonant light, modulate the second information to the fourth resonant light to obtain fifth resonant light, and emit the fifth resonant light, wherein the fourth resonant light is the resonant light except the first laser light in the third resonant light; the communication method may further include: transmitting a part of the fifth resonance light to obtain second laser light; converting the second laser light into a second electrical signal; the second electrical signal is demodulated to obtain second information.

According to the communication method disclosed by the embodiment of the invention, after the terminal equipment receives the resonant light from the network equipment, the information required to be sent to the network equipment can be modulated into the reflected resonant light and sent to the network equipment, so that the network equipment can obtain the information sent by the terminal equipment through the transmitted laser. Therefore, when the terminal device communicates with the network device, the terminal device modulates the information to be transmitted into the resonant light transmitted by the network device and transmits the modulated information to the terminal device, and therefore the terminal device does not need to be provided with a laser light source, and the power consumption of the terminal device can be reduced. In addition, because terminal equipment does not need to set up laser light source, consequently, can avoid the laser because the great damage that causes people's glasses of power to can further improve the transmission distance of information.

As a possible implementation manner, when the first resonant light is emitted according to the information to be transmitted, an excitation signal may be generated according to the information to be transmitted, and then the first resonant light may be emitted according to the excitation signal.

As a possible implementation manner, the first resonant light is emitted according to information to be sent, which may be processing the information to be sent to obtain a first baseband signal, and then emitting the first resonant light according to the first baseband signal; modulating information of different terminal devices in the information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light, wherein the second resonant light can be obtained by modulating baseband signals of different terminal devices in the first baseband signal onto light waves with different wavelengths in the first resonant light; the first terminal device may demodulate the first electrical signal to obtain the first information, may demodulate the first electrical signal for the first terminal device to obtain a first baseband signal, and may process the first baseband signal to obtain the first information.

As a possible implementation manner, the first terminal device modulates the second information to the fourth resonant light to obtain the fifth resonant light, and may process the second information to obtain a second baseband signal for the first terminal device, and modulate the second baseband signal to the fourth resonant light to obtain the fifth resonant light; the second electrical signal is demodulated to obtain the second information, which may be demodulating the second electrical signal to obtain a second baseband signal, and then processing the second baseband signal to obtain the second information.

As a possible embodiment, the second resonant light is radiated to different directions according to the wavelength, the power of the second resonant light may be amplified to obtain the sixth resonant light, and then the sixth resonant light is radiated to different directions according to the wavelength; the third resonant light is resonant light of the second resonant light that is radiated in the direction in which the first terminal device is located, and the third resonant light may be resonant light of the sixth resonant light that is radiated in the direction in which the first terminal device is located.

In the communication method disclosed in the embodiment of the present invention, the transmission distance of light is related to the power of light, and the larger the power of light is, the farther the transmission distance of light is. The power of the resonant light can be amplified before the resonant light is radiated by the network equipment, and the light can be ensured to have enough transmission distance, so that the reliability of light transmission can be ensured, and the reliability of a communication system can be further improved.

As a possible implementation, the communication method may further include: amplifying power of the second resonant light radiated to a different direction to obtain seventh resonant light; the third resonant light is resonant light of the second resonant light that is radiated in the direction in which the first terminal device is located, and the third resonant light may be resonant light of the seventh resonant light that is radiated in the direction in which the first terminal device is located.

As a possible implementation, the network device may include an emitter for emitting the resonant light, and the communication method may further include: generating a first measurement signal; emitting eighth resonant light according to the first measurement signal; modulating the first measurement signal to the eighth resonant light to obtain ninth resonant light; radiating ninth resonant light to different directions according to the wavelength, wherein the ninth resonant light is used for the first terminal device to reflect tenth resonant light, generating a second measuring signal, and modulating the second measuring signal to the tenth resonant light to obtain eleventh resonant light, and the tenth resonant light is part of the ninth resonant light radiated in the resonant light in the direction of the first terminal device; transmitting a part of the eleventh resonance light to obtain third laser light; converting the third laser light into a third electrical signal; demodulating the third electrical signal to obtain a second measurement signal; the transmission angle of the transmitter is adjusted according to the signal quality of the second measurement signal.

A fourth aspect discloses a communication method, which may be applied to a first terminal device, the first terminal device being any one of one or more terminal devices communicating with a network device, and the communication method may include: receiving third resonant light from the network device, where the third resonant light is resonant light radiated in a direction in which the first terminal device is located in second resonant light radiated in different directions according to wavelength by the network device, the second resonant light is resonant light obtained after the network device modulates information of different terminal devices in information to be sent onto light waves of different wavelengths in the first resonant light, the first resonant light is resonant light emitted by the network device according to the information to be sent, and the information to be sent may include the first information; transmitting a part of the third resonant light to obtain first laser light; converting the first laser light into a first electrical signal; the first electrical signal is demodulated to obtain first information.

As a possible implementation, the communication method may further include: reflecting fourth resonant light, wherein the fourth resonant light is resonant light except the first laser light in the third resonant light; modulating second information to the fourth resonance light to obtain fifth resonance light; and emitting fifth resonant light, wherein the fifth resonant light is used for transmitting part of the fifth resonant light by the network equipment to obtain second laser light, converting the second laser light into a second electric signal, and demodulating the second electric signal to obtain second information.

As a possible implementation manner, the first resonant light is resonant light emitted by the network device according to the information to be sent, and may be resonant light emitted by the network device according to an excitation signal, where the excitation signal is generated by the network device according to the information to be sent.

As a possible implementation manner, the first resonant light is resonant light emitted by the network device according to the information to be sent, and may be resonant light emitted by the network device according to a first baseband signal, where the first baseband signal is obtained by processing the information to be sent by the network device; the second resonant light is obtained by the network device modulating information of different terminal devices in the information to be transmitted onto optical waves with different wavelengths in the first resonant light, and may be the resonant light obtained by the network device modulating baseband signals of different terminal devices in the first baseband signal onto optical waves with different wavelengths in the first resonant light; the first electrical signal may be demodulated to obtain a first baseband signal, and then the first baseband signal may be processed to obtain the first information.

As a possible implementation manner, the second information is modulated to the fourth resonant light to obtain the fifth resonant light, the second information may be processed to obtain a second baseband signal, and then the second baseband signal is modulated to the fourth resonant light to obtain the fifth resonant light; the network device demodulating the second electrical signal to obtain the second information includes: the network device demodulates the second electrical signal to obtain a second baseband signal, and processes the second baseband signal to obtain second information.

As a possible embodiment, the third resonant light is a resonant light radiated in a direction in which the first terminal device is located, among second resonant lights radiated in different directions by the network device according to wavelengths, and includes: the third resonant light is resonant light radiated in the direction of the first terminal device from sixth resonant light radiated in different directions by the network device according to the wavelength, and the sixth resonant light is resonant light obtained by amplifying the power of the second resonant light by the network device.

As a possible implementation, the network device includes an emitter for emitting the resonant light, and the communication method may further include: reflecting tenth resonant light, wherein the tenth resonant light is partial resonant light radiated in resonant light in the direction of the first terminal device from ninth resonant light radiated in different directions according to the wavelength, the ninth resonant light is resonant light obtained after the network device modulates the first measurement signal to the eighth resonant light, the eighth resonant light is resonant light emitted by the network device according to the first measurement signal, and the first measurement signal is generated by the network device; generating a second measurement signal; modulating the second measurement signal to tenth resonant light to obtain eleventh resonant light, wherein the eleventh resonant light is used for transmitting part of the eleventh resonant light by the network device to obtain third laser light, converting the third laser light into a third electric signal, demodulating the third electric signal to obtain a second measurement signal, and adjusting the emission angle of the emitter according to the signal quality of the second measurement signal.

A fifth aspect discloses a communication apparatus, which may be a network device or a terminal device, and the network device may include means for performing the communication method disclosed in any embodiment of the third aspect or the third aspect, or include means for performing the communication method disclosed in any embodiment of the fourth aspect or the fourth aspect.

A sixth aspect discloses a communication apparatus, which may be a network device or a terminal device, and which may include a processor, a memory, an input interface for receiving information from a communication apparatus other than the communication apparatus, and an output interface for outputting information to the communication apparatus other than the communication apparatus. When the processor executes the computer program stored in the memory, it causes the processor to perform the communication method disclosed in the third aspect or any of the possible implementations of the third aspect, or causes the processor to perform the communication method disclosed in any embodiment of the fourth aspect or the fourth aspect.

A seventh aspect discloses a computer readable storage medium having stored thereon a computer program which, when run, implements a communication method as disclosed in any of the embodiments of the third aspect or the third aspect, or implements a communication method as disclosed in any of the embodiments of the fourth aspect or the fourth aspect.

Drawings

Fig. 1 is a schematic structural diagram of a wireless optical communication system according to an embodiment of the present invention;

FIG. 2 is a schematic structural diagram of an LED communication system according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of signal processing of an LED communication system according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of a laser according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of a laser emitting light according to an embodiment of the present invention;

FIG. 6 is a schematic structural diagram of a laser according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of another laser according to the disclosure of the present invention;

FIG. 8 is a diagram of a CSMA/CA system accessed by a user according to an embodiment of the present invention;

fig. 9 is a schematic diagram of a scheduling-based time division multiple access according to an embodiment of the present invention;

fig. 10 is a schematic diagram of a multiple access scheme based on space division multiplexing according to an embodiment of the present invention;

FIG. 11 is a schematic diagram of a network architecture according to an embodiment of the present invention;

fig. 12 is a schematic structural diagram of a communication system according to an embodiment of the present invention;

fig. 13 is a schematic structural diagram of another communication system according to the embodiment of the present invention;

FIG. 14 is a schematic structural diagram of an open cavity laser according to an embodiment of the present invention;

FIG. 15 is a schematic structural diagram of a diffraction grating according to an embodiment of the present invention;

FIG. 16 is a schematic diagram of a diffraction grating for diffracting light of different wavelengths into different directions according to an embodiment of the present invention;

FIG. 17 is a schematic illustration of a spectrum of a diffraction grating according to an embodiment of the present disclosure;

FIG. 18 is a schematic diagram of an open resonator cavity according to an embodiment of the present invention;

fig. 19 is a schematic diagram of a gain medium disposed between a transmitter and a diffraction grating in a network device according to an embodiment of the present disclosure;

FIG. 20 is a schematic diagram of a gain medium disposed outside a diffraction grating in a network device according to an embodiment of the present invention;

fig. 21 is a schematic diagram of a network device communicating with two terminal devices according to an embodiment of the present invention;

fig. 22 is a schematic diagram of a network device communicating with three terminal devices according to an embodiment of the present invention;

fig. 23 is a schematic diagram of another network device communicating with two terminal devices according to the embodiment of the present invention;

FIG. 24 is a flow chart illustrating a communication method according to an embodiment of the present invention;

fig. 25 is a schematic structural diagram of a communication device according to an embodiment of the present invention;

fig. 26 is a schematic structural diagram of another communication device according to the embodiment of the present invention.

Detailed Description

The embodiment of the invention discloses a communication method and a communication system, which are used for improving the bandwidth utilization rate of a system. The following are detailed below.

In order to better understand the embodiment of the present invention and disclose a communication method and system, an application scenario of the embodiment of the present invention is described first. Wireless optical communication technology is the product of a combination of optical and wireless communications. Because light has abundant bandwidth resources, the wireless optical communication technology has great application prospect. Referring to fig. 1, fig. 1 is a schematic structural diagram of a wireless optical communication system according to an embodiment of the present invention. As shown in fig. 1, the wireless optical communication system may include a transmitter (transmitter) and a receiver (receiver), the transmitter may include a driver circuit (driver circuit), a light source and a light emitter (transmitter optics), and the receiver may include an optical receiver (receiver optics), an optical-to-electrical conversion (O-E) receiver and an amplifier. And the driving circuit is used for driving the light source to emit light according to the input. A light source for emitting a light signal to the light emitter. An optical transmitter for transmitting an optical signal to an optical receiver through an optical channel (optical channel). And the optical receiver is used for transmitting the optical signal to the photoelectric conversion receiver. And the photoelectric conversion receiver is used for converting the optical signal into an electric signal and sending the electric signal to the amplifier. And the amplifier is used for amplifying the electric signal and outputting the amplified electric signal.

Currently, the wireless optical communication technology uses Light Emitting Diode (LED) based indoor light waves instead of radio waves for data transmission. Referring to fig. 2, fig. 2 is a schematic structural diagram of an LED communication system according to an embodiment of the present invention. As shown in fig. 2, the LED communication system may include a base station and a terminal device, and each of the base station and the terminal device may include a photodiode (photodiode), a visible light LED (visible light LED), a Trans Impedance Amplifier (TIA), an Orthogonal Frequency Division Multiplexing (OFDM) transceiver, and a current driver (current driver). The base station and the terminal equipment can communicate through an optical channel. For better explanation of the LED communication system, please refer to fig. 3, and fig. 3 is a schematic diagram of signal processing of an LED communication system according to an embodiment of the present invention. As shown in fig. 2 and 3, the LED communication system may include an emitting end and a receiving end, each of which may include an electrical portion and an optical portion. The electrical part of the emitting end may comprise an LED driving circuit and an electrical signal processing circuit. The optical portion of the transmitting end may include an LED chip and an optical transmitting antenna. The electrical part of the receiving end may comprise a received signal processing circuit. The optical portion of the receiving end may include an optical receiving antenna and a detector chip. The LED driving circuit may be the LED current driver in fig. 2, or may be another LED driver, and is configured to drive the LED. And the electric signal processing circuit is used for coding, modulating, pre-equalizing and the like of the electric signal to be transmitted. And the LED chip is used for emitting a visible light signal under the drive of the LED drive circuit. And the optical transmitting antenna is used for transmitting the visible light signal to the receiving end. And the optical receiving antenna is used for receiving the visible light signal. And the detector chip is used for converting the visible light signal into an electric signal. And the received signal processing circuit is used for carrying out post-equalization, demodulation, decoding and other processing on the electric signal. The detector chip may be a P-type semiconductor-impurity-N-type semiconductor (PIN) diode. The base station and the terminal equipment can be used as a transmitting end and a receiving end.

However, the available modulation bandwidth of common commercial LEDs is only a few tens of MHz, which greatly limits the transmission rate of wireless light. The laser is a novel light source, is a beam of light with approximate single frequency, can realize information transmission through modulation, has the characteristics of high brightness, strong directivity, good monochromaticity, strong coherence and the like, can penetrate through space and space between celestial bodies and under vast sea, and realizes the long-hoped wireless optical communication. In addition, in the light color conversion process of the laser, the laser with different wavelengths can be mixed into white light to be output, a fluorescent film is not needed, so that the laser with different wavelengths can be used as different data paths in a communication link by adopting a multiplexing technology, and the data carried by the laser can be improved. Because the high energy efficiency and optical effect of the laser can improve the code modulation rate by 10 times, a laser diode can be used to replace an LED. The high efficiency and optical effect of the laser may be a 10 times increase in the coded modulation rate over the LED.

When the wireless optical communication technology uses laser light for communication, the wireless optical communication may be referred to as wireless laser communication. The wireless laser communication may be called Free Space Optical (FSO), which is a communication method using free space as a transmission channel, and has the advantages of high code rate, high bandwidth, flexibility, and the like. The wireless laser communication can be divided into atmospheric laser communication, underwater laser communication and the like according to the difference of free space channels. Wireless laser communication uses a laser beam as an information carrier without using a transmission medium such as an optical fiber or a wired channel. In the early days, research and application of wireless laser communication was focused on the fields of aerospace and military defense. With the development of various technologies, wireless laser communication is gradually applied to ground communication, and the overall process is becoming mature. Referring to fig. 4, fig. 4 is a schematic diagram of a laser according to an embodiment of the disclosure. Referring to fig. 5, fig. 5 is a schematic diagram of a laser emitting light according to an embodiment of the disclosure. Referring to fig. 6, fig. 6 is a schematic structural diagram of a laser according to an embodiment of the present invention. As shown in fig. 6, the laser may include a total reflection mirror, a half reflection mirror, a gain medium, and an excitation source. The total reflection mirror, the half reflection mirror and the gain medium may form a laser cavity. The total reflection mirror may totally reflect the light projected onto the total reflection mirror. The half mirror may reflect a part of light projected onto the half mirror and transmit another part of light. The light reflected between the total reflection mirror and the semi-reflection mirror is the vibration attenuation light, and the light transmitted by the semi-reflection mirror is the laser. The gain medium may amplify the power of the light. Referring to fig. 7, fig. 7 is a schematic structural diagram of another laser disclosed in the embodiments of the present invention. As shown in fig. 7, the laser working substance is the substance in the gain medium in fig. 6.

The wireless laser communication system can include a transmitting end and a receiving end, the transmitting end can include a laser, an optical modulator and an optical transmitting antenna, and the receiving end can include an optical receiving antenna, an optical filter and an optical detector. In communication, the laser sends information to be transmitted to the optical modulator; after receiving the information from the laser, the optical modulator modulates the information onto the laser to obtain resonant light and sends the resonant light to the optical transmitting antenna; after receiving the resonant light from the optical modulator, the optical transmitting antenna transmits the resonant light to the optical receiving antenna. After the optical receiving antenna receives the resonant light from the optical transmitting antenna, transmitting part of the resonant light to an optical filter to obtain laser light; after receiving the laser from the optical receiving antenna, the optical filter performs filtering processing on the laser and sends the filtered laser to the optical detector; the photodetector receives the filtered laser light from the optical filter, converts the filtered laser light into an electrical signal, and performs processing such as amplification and demodulation on the electrical signal to obtain original information.

However, in wireless laser communication, there are the following disadvantages. And (1) the power consumption is large. Because laser has a high requirement for beam alignment, and uplink communication also requires a laser to transmit data, a laser transmitter needs to be added to the terminal device, so that power consumption of the terminal device is increased. And (2) the cost is high. The major reasons for the major focus of system research based on atmospheric laser communication are the high cost of optoelectronic devices, such as semiconductor lasers, photodetectors, optical transmitting and receiving antennas, etc., which largely determine the performance of the system. And (3) limited transmission power. The laser itself is used as a high-intensity coherent light source, and has great harm to human eyes under certain power. The safety of human eyes is limited for laser products, but the laser emission power directly determines the transmission distance of equipment, and the laser emission power and the modulation frequency are mutually restricted, i.e. the modulation frequency of a high-power laser cannot be very high. The cost and temperature control of semiconductor lasers also become increasingly difficult as the emitted power increases. For the above reasons, the development of laser communication is limited to some extent.

In laser communication or LED visible light communication, multiple users generally need to be supported for access, and when multiple users access a communication system at the same time, multiple uplink users and multiple downlink users may be included. In a conventional communication system, multi-user multiple access can be realized by time division multiplexing, frequency division multiplexing, code division multiplexing, space division multiplexing and the like, so that simultaneous communication of multiple users can be realized.

However, in laser or LED visible light communication, the research on multi-user access schemes is still relatively few, and general ways include time division, space division, and the like.

In the existing laser communication or visible light communication, the most common access mode is time division multiplexing, and the specific mode is similar to a carrier sense multiple access (CSMA/CA) mode with collision avoidance, or a time division scheduling mode. For CSMA/CA system, when user accesses system, it needs to detect idle channel first. Specifically, the magnitude of the optical power of the channel may be detected, and when the optical power of the channel is detected to be smaller than a certain threshold, the channel access attempt is started, and the backoff is randomly performed, and after the backoff is completed, the optical power of the channel is still lower than the certain threshold, which indicates that the channel is idle, and then the channel access is started. In the whole access process, other users wait and detect the optical power of the channel in real time. Referring to fig. 8, fig. 8 is a schematic diagram of a user access CSMA/CA system according to an embodiment of the present invention. As shown in fig. 8, in the case that the source station has a frame to send and the channel is idle, the source station sends a first frame to the destination station after an inter-frame interval, and after the destination station receives the first frame, the destination station sends an Acknowledgement (ACK) frame to the source station after the inter-frame interval, which is used to describe that the destination station successfully receives the first frame. When another station has a frame to transmit during communication between the source station and the destination station, the channel is transmitting information, and therefore, information cannot be transmitted. After the source station sends the ACK frame and the inter-frame interval, other stations detect that the signal is idle, and send the next frame to the source station after waiting for a period of time. The interframe space may be a short interframe Space (SIFT), a Point Coordination Function (PCF) interframe space (PIFT), or a distributed interframe space (DIFS). SIFT is the shortest inter-frame spacing that separates frames belonging to a conversation. During this time, a station should be able to switch from a transmitting mode to a receiving mode. The frame types using the SIFS include an Acknowledgement (ACK) frame, a Clear To Send (CTS) frame, a data frame fragmented by a Medium Access Control (MAC) frame that is too long, a frame polled by all the responding Access Points (APs), and any frame transmitted from an access point in the PCF method. The PIFS is longer than SIFS in order to preferentially gain access to the medium when the PCF system is first used (used in the PCF system without contention). The length of the PIFS is the length of the SIPF plus one slot time (slot time). The length of the DIFS is one more time slot than the PIFS, and is used for transmitting data frames and management frames in a Distributed Coordination Function (DCF) mode. In the above manner, since the terminal device may continuously occupy the entire system bandwidth, but the entire system bandwidth is relatively large, a single user is not enough to use the entire bandwidth, so that bandwidth is wasted. Therefore, in order to improve the spectrum efficiency of the whole system, how to separate the bandwidth into multiple parts for multiple users becomes a technical problem to be solved urgently.

In addition to the contention-based time division multiple access method, there is also a time division multiple access based on scheduling in the existing laser communication or visible light communication. The method uses the central node to control the access time slot of each user in a centralized way, when the user needs to send service, the central node can apply for bandwidth resources, and after receiving the request, the central node allocates the access time slot for the user according to the service request of the user and the user condition of the whole system. Referring to fig. 9, fig. 9 is a schematic diagram of a scheduling-based tdma according to an embodiment of the present invention. As shown in fig. 9, each user occupies one time slot (TDMA), and one Time Division Multiple Access (TDMA) frame may include a plurality of time slots. The user can continuously and circularly occupy the whole channel according to the scheduling result, and the scheduling algorithm determines the time and the time for occupying the channel. Time division multiple access based on scheduling, has better efficiency compared with the CSMA/CA) method. However, since the terminal devices still continuously occupy the entire system bandwidth, but the entire system bandwidth is relatively large, a single user is not enough to use the entire bandwidth. Therefore, in order to improve the spectrum efficiency of the whole system, how to separate the bandwidth into multiple parts for multiple users becomes a technical problem to be solved urgently.

In the conventional laser communication or visible light communication, there is a multiple access method based on space division multiplexing in addition to a multiple access method based on time division multiplexing. Each user can access one channel, and different users are separated by space. For optical wireless communication, each user is accessed through one laser or one LED, and the lasers or the LEDs are isolated in space through natural isolation, so that multi-user access can be achieved in a multi-array mode. Referring to fig. 10, fig. 10 is a schematic diagram of a multiple access method based on space division multiplexing according to an embodiment of the present invention. As shown in fig. 10, the transmitting end has a plurality of LEDs, the receiving end has a plurality of LEDs, and each transmitting LED and each receiving LED can be paired to complete transceiving, so that a plurality of users can access the system at the same time, and a space division multiplexing effect is achieved. In the multiple access method based on space division multiplexing, the interference among the LED arrays is large, a more complex algorithm is required for interference cancellation, and meanwhile, due to the radiation of light, the interference among multiple channels is caused, so that the quality of signals among the channels is reduced.

In order to better understand the embodiment of the present invention and disclose a communication method and system, a network architecture used in the embodiment of the present invention is described first. Referring to fig. 11, fig. 11 is a schematic diagram of a network architecture according to an embodiment of the present invention. As shown in fig. 11, the network architecture may include a network device and a plurality of terminal devices (3 are illustrated in fig. 11) that may communicate with the network device. The terminal equipment and the network equipment can communicate through the laser.

The terminal equipment may be User Equipment (UE), an access terminal, a subscriber unit, a subscriber station, a mobile station, a remote terminal, a mobile device, a user terminal, a wireless communication device, a user agent, or a user device. An access terminal may be a cellular telephone, a cordless telephone, a Session Initiation Protocol (SIP) phone, a Wireless Local Loop (WLL) station, a Personal Digital Assistant (PDA), a handheld device with wireless communication capabilities, a computing device or other processing device connected to a wireless modem, a vehicle mounted device, a wearable device, a terminal in a future 5G network or a terminal in a future evolved PLMN network, etc.

The network device may be an access network device or a core network device. The access network equipment may include various forms of base stations, such as: macro base stations, micro base stations (also referred to as small stations), relay stations, access points, etc.

Referring to fig. 12 based on the network architecture shown in fig. 11, fig. 12 is a schematic structural diagram of a communication system according to an embodiment of the present invention. As shown in fig. 12, the communication system may include a network device and N terminal devices, the network device may include a transmitter, a first modulator, and a diffraction grating, the first terminal device may include a first reflector, a first photodetector, and a first demodulator, the first terminal device is any one of the N terminal devices, N is an integer greater than or equal to 1, where:

the transmitter is used for transmitting first resonant light according to information to be transmitted, wherein the information to be transmitted can comprise first information, and the first information is information required to be transmitted to the first terminal equipment;

the first modulator is used for modulating information of different terminal devices in information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light;

a diffraction grating for radiating the second resonant light to different directions by wavelength;

a first reflector for transmitting a part of the third resonant light to obtain a first laser light, the third resonant light being a resonant light of the second resonant light radiated in a direction in which the first terminal device is located;

a first photodetector for converting the first laser light into a first electrical signal;

a first demodulator for demodulating the first electrical signal to obtain first information.

Each of the N terminal devices may transmit data using one or more wavelengths. Which wavelengths are used by each of the N terminal devices to transmit data may be fixed or determined in a scheduling manner. Therefore, when there is information to be transmitted in the network device, that is, information to be transmitted to the terminal device, the transmitter in the network device may emit the first resonant light. The information to be transmitted may only include information that needs to be transmitted to one terminal device, or may include information that needs to be transmitted to a plurality of terminal devices. The first resonant light is a full spectrum resonant light. After the transmitter in the network device transmits the first resonant light, the first modulator in the network device may modulate information of different terminal devices in the information to be transmitted onto optical waves with different wavelengths in the first resonant light, that is, modulate information of different terminal devices in the information to be transmitted onto optical waves with wavelengths corresponding to different terminal devices in the first resonant light, to obtain the second resonant light. The second resonant light is resonant light that carries or includes information that is transmitted to the terminal device. Then, the diffraction grating in the network device may radiate the second resonant light to different directions according to the wavelength, that is, radiate light with different wavelengths in the second resonant light to different directions, that is, decompose the second resonant light into a multi-color single-channel optical signal according to the wavelength. The resonant light in different directions can then be transmitted to the terminal device through the optical path. The first reflector in each of the N terminal devices may receive the resonant light radiated to the direction in which the terminal device is located, from among the second resonant light radiated from the network device. The first reflector may transmit a part of the third resonant light, which is the resonant light of the second resonant light radiated in the direction in which the first terminal device is located, to obtain the first laser light. The first photodetector may convert the first laser light into a first electrical signal, and the first demodulator may demodulate the first electrical signal to obtain the first information. The emitter may be a light source of a laser composed of the network device and the terminal device, and the first reflector may be a half mirror.

Referring to fig. 13 based on the network architecture shown in fig. 11, fig. 13 is a schematic structural diagram of another communication system according to an embodiment of the present invention. As shown in fig. 13, the communication system may include a network device and N terminal devices, the network device may include a transmitter, a first modulator, and a diffraction grating, the first terminal device may include a first reflector, a first photodetector, and a first demodulator, the first terminal device is any one of the N terminal devices, N is an integer greater than or equal to 1, where:

The detailed description may refer to the description corresponding to fig. 12, and is not repeated herein.

Optionally, the first terminal device may further include a second modulator, and the network device may further include a second reflector, a second photodetector, and a second demodulator, wherein:

the first reflector is also used for reflecting fourth resonant light, and the fourth resonant light is resonant light except the first laser light in the third resonant light;

a second modulator for modulating second information to the fourth resonance light to obtain fifth resonance light;

a second reflector for transmitting part of the fifth resonant light to obtain a second laser light;

a second photodetector for converting the second laser light into a second electrical signal;

a second demodulator for demodulating the second electrical signal to obtain second information.

After the first reflector in the first terminal device receives the third resonant light from the network device, the fourth resonant light is reflected in addition to transmitting a part of the third resonant light to obtain the first laser light. In the case where the first terminal device has second information to be transmitted to the network device, the second modulator may modulate the second information to the fourth resonant light to obtain fifth resonant light. The fifth resonating light is transmitted to the network device through the optical path. After receiving the fifth resonant light from the first terminal device, the second reflector in the network device may transmit a part of the fifth resonant light to obtain second laser light, the second photodetector may convert the second laser light into a second electrical signal, and the second demodulator may demodulate the second electrical signal to obtain second information.

The second reflector may be a half mirror. The second reflector can also reflect resonant light except the second laser light in the fifth resonant light, and the resonant light resonates back and forth between the second reflector in the network device and the first reflector in the terminal device to form a resonant cavity. Because the two ends of the resonant cavity of the laser are respectively positioned at the terminal equipment and the network equipment, the resonant cavity is open, and resonant light can continuously resonate between the network equipment and the terminal equipment. The second mirror of the network device, the first mirror of the terminal device, and the gain medium in the network device may form an open resonator.

In order to support communication among a plurality of terminal apparatuses, the communication system may employ a scheme such as time division multiplexing or space division multiplexing. In the communication system, because a plurality of terminal devices can simultaneously occupy the system bandwidth and the resources of the resonant cavity, the self-interference elimination characteristics among different wavelengths and the differences of the positions and the shielding conditions of different terminal devices can provide better access efficiency. In addition, different open resonant cavities can be formed between different terminal devices and network devices in the communication system, so that a plurality of terminal devices can share the bandwidth of the whole communication system, and a multiple-access mode of multiple resonant cavities can be realized, thereby improving the bandwidth utilization rate. In addition, each terminal device is not limited by laser power and the number of human eyes, and high-speed access of multiple terminal devices can be achieved.

Referring to fig. 14, fig. 14 is a schematic structural diagram of an open resonator laser according to an embodiment of the present invention. As shown in fig. 14, the resonant cavity of the laser is open, and the total reflection mirror and the half-reflection mirror belong to two different independent entities. After the resonant cavity is pulled open, the light incident from all directions can be changed into parallel light through the reflector, and the gain medium can amplify the power of the resonant light. The open resonant cavity has the advantages that when the optical path of the communication system is shielded, the resonant link is naturally interrupted, the laser does not emit signals any more, the laser can be used under high power, and the human eyes cannot be injured. Meanwhile, the uplink also has a resonance light path part, so that an independent laser light source is not needed for uplink transmission, and the problems of power consumption, high cost and the like of the terminal equipment do not exist. In addition, since resonance of incident light in all directions can be maintained, a communication system such as mobility can be supported well.

Referring to fig. 15, fig. 15 is a schematic structural diagram of a diffraction grating according to an embodiment of the disclosure. As shown in fig. 15, the diffraction grating may be composed of a large number of slits (or notches) that are parallel to each other, of equal width, and of equal spacing. The diffraction grating may include a plurality of transparent regions and a plurality of opaque regions. The width of each transparent region may be a, the width of each opaque region may be b, and the distance between the slits is d, which may be referred to as a grating constant. The values of a, b and d may be fixed or variable, so that the diffraction grating may be variableAnd (5) modulating the grating. To better illustrate the working principle of the diffraction grating, please refer to fig. 16, in which fig. 16 is a schematic diagram of a diffraction grating for diffracting light with different wavelengths to different directions according to an embodiment of the present invention. As shown in FIG. 16, when a parallel light beam is perpendicularly irradiated on the diffraction grating, the diffraction angle is set

Will generate optical path difference in the direction of

When in use

When is at

The light wave with the wavelength of lambda can be obtained in the direction, the terminal equipment in the direction can receive the resonant light corresponding to the wavelength, the resonant light generated after diffraction of the diffraction grating is firstly projected on a reflector in the terminal equipment, the reflector can reflect part of the resonant light back to the diffraction grating in the original path to generate reflected light of diffracted light, the reflected light is fed back to the laser, and the light wave and a reflector of a user are used for emitting to form resonance, so that the effect of single user resonance is achieved. It can be seen that the wavelengths of light are different, and the optical path difference is different, so that light with different wavelengths can be radiated to different directions. Referring to fig. 17, fig. 17 is a schematic spectrum diagram of a diffraction grating according to an embodiment of the disclosure. As shown in fig. 17, the resonant light of the same wavelength radiated by the diffraction grating may include a primary spectrum, a secondary spectrum, and a tertiary spectrum.

Referring to fig. 18, fig. 18 is a schematic diagram of an open resonator according to an embodiment of the disclosure. As shown in fig. 18, in the direction of each wavelength, after receiving the resonant light of the corresponding wavelength, the mirror of the terminal device may modulate the information to be transmitted to the resonant light and transmit the modulated information back to the network device, so as to form resonance with the network device. After receiving the modulated resonant light, the network device can separate the signal with the wavelength corresponding to the terminal device, thereby achieving the purpose of accessing multiple terminal devices.

Optionally, the network device may further comprise an excitation source, wherein:

the excitation source is used for generating an excitation signal according to information to be transmitted;

the transmitter transmits the first resonant light according to information to be transmitted, and comprises:

the transmitter transmits the first resonant light according to the excitation signal.

Optionally, the network device may further include a first baseband transmission module, and the first terminal device may further include a first baseband reception module, where:

the first baseband sending module is used for processing information to be sent to obtain a first baseband signal;

the transmitter transmits first resonant light according to the first baseband signal;

the first modulator modulates information of different terminal devices in information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light, and the second modulator comprises the following steps:

the first modulator modulates baseband signals of different terminal devices in the first baseband signal onto light waves with different wavelengths in the first resonant light to obtain second resonant light;

the first demodulator demodulating the first electrical signal to obtain the first information includes:

a first demodulator demodulates the first electrical signal to obtain a first baseband signal;

the first baseband receiving module is used for processing the first baseband signal to obtain first information.

The first baseband sending module may perform modulation, coding, and other processing on information to be sent to obtain a first baseband signal.

Optionally, the network device may further include a second baseband receiving module, and the first terminal device may further include a second baseband transmitting module, where:

the second baseband sending module is used for processing the second information to obtain a second baseband signal;

the second modulator modulating the second information to the fourth resonance light to obtain the fifth resonance light includes:

the second modulator modulates the second baseband signal to the fourth resonant light to obtain fifth resonant light;

the second demodulator demodulating the second electrical signal to obtain the second information includes:

the second demodulator demodulates the second electrical signal to obtain a second baseband signal;

and the second baseband receiving module is used for processing the second baseband signal to obtain second information.

Optionally, the network device may further include a gain medium, wherein:

a gain medium for amplifying power of the second resonant light to obtain sixth resonant light;

the diffraction grating radiating the second resonant light to different directions by wavelength includes:

the diffraction grating radiates the sixth resonant light to different directions according to the wavelength;

the third resonant light is resonant light of the second resonant light radiated in a direction in which the first terminal device is located, and includes:

the third resonant light is resonant light radiated in a direction in which the first terminal device is located among the sixth resonant light.

Optionally, the network device may further include a gain medium, wherein:

a gain medium for amplifying power of the second resonant light radiated to a different direction to obtain seventh resonant light;

the third resonant light is resonant light radiated in a direction in which the first terminal device is located among the seventh resonant light.

The gain medium can be arranged between the transmitter and the diffraction grating in the network equipment, or arranged outside the diffraction grating in the network equipment, and can amplify the power of the resonant light. Referring to fig. 19, fig. 19 is a schematic diagram of a gain medium disposed between an emitter and a diffraction grating in a network device according to an embodiment of the present invention. Referring to fig. 20, fig. 20 is a schematic diagram of a gain medium disposed outside a diffraction grating in a network device according to an embodiment of the present invention.

Optionally, the network device may further include a first alignment measurement module, and the terminal device may further include a second alignment measurement module, where:

a first alignment measurement module for generating a first measurement signal;

a transmitter for transmitting the eighth resonant light according to the first measurement signal;

a first modulator for modulating the first measurement signal to the eighth resonance light to obtain a ninth resonance light;

a diffraction grating for radiating the ninth resonant light to a different direction by wavelength;

the first reflector is further used for reflecting tenth resonant light, and the tenth resonant light is part of the ninth resonant light radiated in the resonant light in the direction of the first terminal equipment;

a second alignment measurement module for generating a second measurement signal;

a second modulator for modulating a second measurement signal to the tenth resonance light to obtain eleventh resonance light;

a second reflector for transmitting part of the eleventh resonant light to obtain a third laser light;

the second photoelectric detector is also used for converting the third laser into a third electric signal;

a second demodulator further for demodulating the third electrical signal to obtain a second measurement signal;

and the first alignment measurement module is also used for adjusting the transmission angle of the transmitter according to the signal quality of the second measurement signal.

Before the network device communicates with the terminal device, a first alignment measurement module in the network device may generate a first measurement signal, the transmitter may transmit eighth resonant light according to the first measurement signal, the first modulator may modulate the first measurement signal to the eighth resonant light to obtain ninth resonant light, the diffraction grating may radiate the ninth resonant light to a different direction according to a wavelength, the first reflector may reflect the tenth resonant light, the second alignment measurement module may generate a second measurement signal, the second modulator may modulate the second measurement signal to the tenth resonant light to obtain eleventh resonant light, the second reflector transmits a part of the eleventh resonant light to obtain third laser light, the second photodetector may convert the third laser light to a third electrical signal, the second demodulator may demodulate the third electrical signal to obtain a second measurement signal, and the first alignment measurement module may adjust an emission angle of the transmitter according to a signal quality of the second measurement signal. In the case where the signal quality is greater than or equal to the threshold, the transmission angle of the transmitter may not be adjusted, and in the case where the signal quality is less than the threshold, the transmission angle of the transmitter may be adjusted until the signal quality is greater than or equal to the threshold.

When the network device communicates with the terminal device, the first alignment measurement module in the network device may generate a first measurement signal, the first baseband transmission module in the network device may process the first measurement signal to obtain a third baseband signal, the excitation source in the network device may generate an excitation signal according to the third baseband signal, and the transmitter may transmit the resonant light according to the excitation signal. The first modulator in the network device may modulate the baseband signals of different terminal devices in the third baseband signal onto the optical waves with wavelengths corresponding to different terminal devices in the transmitted resonant light. The diffraction grating in the network device may radiate the modulated resonant light in different directions according to wavelength. In the case where the gain medium is disposed between the transmitter and the diffraction grating, the gain medium may power-amplify the modulated resonant light, and the diffraction grating may radiate the amplified resonant light to different directions by wavelength. In the case where the gain medium is disposed outside the diffraction grating, the gain medium can power-amplify the resonant light diffracted into different directions. The first reflector may reflect a part of the received resonance light. The second alignment measurement module may generate a second measurement signal, the second baseband transmission module may process the second measurement signal to obtain a fourth baseband signal, and the second modulator may modulate the fourth baseband signal to the reflected resonant light. After receiving the resonant light from the terminal device, the second reflector may transmit a portion of the resonant light to obtain third laser light, the second photodetector may convert the third laser light into a third electrical signal, the second demodulator may demodulate the third electrical signal to obtain a fourth baseband signal, and the second baseband receiving module may process the fourth baseband signal to obtain a second measurement signal. The first alignment measurement module may adjust a transmission angle of the transmitter according to a signal quality of the second measurement signal. Then, when there is information to be transmitted in the network device, that is, when there is information to be transmitted to the terminal device, the first baseband transmission module in the network device may process the information to be transmitted to obtain a first baseband signal, the excitation source in the network device may generate an excitation signal according to the first baseband signal, and the transmitter may transmit the first resonant light according to the excitation signal. The first modulator in the network device may modulate baseband signals of different terminal devices in the first baseband signal onto optical waves of wavelengths corresponding to different terminal devices in the first resonant light to obtain second resonant light. The diffraction grating in the network device may radiate the second resonant light in different directions by wavelength. In a case where the gain medium is disposed between the transmitter and the diffraction grating, the gain medium may power-amplify the second resonant light, and the diffraction grating may radiate the amplified second resonant light to different directions by wavelength. In the case where the gain medium is disposed outside the diffraction grating, the gain medium may power-amplify the second resonant light diffracted into a different direction. After the first reflector receives the resonant light radiated to the direction of the first terminal device, a part of the resonant light may be transmitted to obtain the first laser light, while the remaining resonant light of the resonant light may be reflected. The first photodetector may convert the first laser light into a first electrical signal, the first demodulator may demodulate the first electrical signal to obtain a first baseband signal, and the first baseband receiving module may process the first baseband signal to obtain the first information. The second baseband transmission module in the first terminal device may process the second information to obtain a second baseband signal, and the second modulator may modulate the second baseband signal into the reflected resonant light. After receiving the resonant light from the first terminal device, the second transmitter in the network device may transmit a part of the resonant light to obtain a second laser light, the second photodetector may convert the second laser light into a second electrical signal, the second demodulator may demodulate the second electrical signal to obtain a second baseband signal, and the second baseband receiving module may demodulate the second baseband signal to obtain second information.

Referring to fig. 21, fig. 21 is a schematic diagram illustrating a network device and two terminal devices according to an embodiment of the present invention. As shown in fig. 21, the network device may modulate data 1 onto a wavelength 1 of the resonance light and data 2 onto a wavelength 2 of the resonance light by the excitation signal, and then may transmit the modulated resonance light to the space through the diffraction grating. The terminal device 1 can receive the light wave with the wavelength 1, and the data 1 can be obtained through demodulation. The terminal device 2 may receive the light wave with the wavelength 2, and the demodulation may obtain the data 2. The two terminal devices can modulate data to be transmitted onto the light waves reflected by the reflector, and the terminal devices can transmit the modulated light waves to the network device to form resonance. Therefore, two terminal devices can be ensured to be simultaneously accessed to the communication system by using different wavelengths, the spectrum efficiency of the system can be improved, and the purpose of multi-user access can be achieved.

Referring to fig. 22, fig. 22 is a schematic diagram illustrating a network device and three terminal devices according to an embodiment of the present invention. As shown in fig. 22, the network device may modulate data 1 onto a wavelength 1 of the resonant light, modulate data 2 onto a wavelength 2 of the resonant light, modulate data 3 onto a wavelength 3 of the resonant light, and then may transmit the modulated resonant light to the space through the diffraction grating. The terminal device 1 can receive the light wave with the wavelength 1, and the data 1 can be obtained through demodulation. The terminal device 2 may receive the light wave with the wavelength 2, and the demodulation may obtain the data 2. The terminal device 3 can receive the light wave with the wavelength 3, and the data 3 can be obtained through demodulation. The three terminal devices can modulate data to be transmitted onto the light waves reflected by the reflectors, and the terminal devices can transmit the modulated light waves to the network device to form resonance. Therefore, the three terminal devices can be ensured to be simultaneously accessed to the communication system by using different wavelengths, the spectrum efficiency of the system can be improved, and the purpose of multi-user access can be achieved.

Referring to fig. 23, fig. 23 is a schematic diagram illustrating another network device according to an embodiment of the present invention communicating with two terminal devices. As shown in fig. 23, the network device may modulate data 1 onto a wavelength 1 of the resonance light, modulate data 2 onto a wavelength 2 of the resonance light, modulate data 3 onto a wavelength 3 of the resonance light by the excitation signal, and then may transmit the modulated resonance light to the space through the diffraction grating. The terminal device 1 can receive the light waves with the wavelength 1 and the wavelength 2, and the data 1 and the data 2 can be obtained through demodulation. The terminal device 2 may receive the light wave with the wavelength 3, and the data 3 may be obtained by demodulation. Terminal device 1 may modulate data to be transmitted onto the light waves with wavelength 1 and wavelength 2 reflected by the mirror, terminal device 2 may modulate data to be transmitted onto the light wave with wavelength 3 reflected by the mirror, and terminal device may transmit the modulated light waves to the network device to form resonance. Therefore, the two terminal devices can be ensured to be simultaneously accessed to the communication system by using different wavelengths, the spectrum efficiency of the system can be improved, and the purpose of multi-user access can be achieved.

Referring to fig. 24, based on the network architecture shown in fig. 11, fig. 24 is a flowchart illustrating a communication method according to an embodiment of the present invention. Wherein, the communication method can be applied to the communication system. As shown in fig. 24, the communication method may include the following steps.

2401. The network equipment transmits first resonant light according to information to be transmitted.

The information to be sent may include first information, where the first information is information that needs to be sent to a first terminal device, and the first terminal device is any one of one or more terminal devices that communicate with the network device.

2402. The network device modulates information of different terminal devices in the information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light.

2403. The network device radiates the second resonant light to a different direction by wavelength.

2404. The first terminal device transmits a part of the third resonant light to obtain the first laser light.

And the third resonant light is the resonant light radiated in the direction of the first terminal device in the second resonant light.

2405. The first terminal device converts the first laser light into a first electrical signal.

2406. The first terminal device demodulates the first electrical signal to obtain first information.

Optionally, the method may further include: the first terminal device reflects the fourth resonant light, modulates second information to the fourth resonant light to obtain fifth resonant light, and emits the fifth resonant light, wherein the fourth resonant light is resonant light except the first laser light in the third resonant light; the network device transmits a part of the fifth resonant light to obtain second laser light, converts the second laser light into a second electric signal, and demodulates the second electric signal to obtain second information.

Optionally, step 2401 may include: the network device generates an excitation signal according to information to be transmitted, and then transmits first resonant light according to the excitation signal.

Optionally, step 2401 may include: the network device processes information to be transmitted to obtain a first baseband signal, and then transmits first resonant light according to the first baseband signal. The network device transmits the first resonant light according to the information to be transmitted, and step 2402 may include: the network device modulates the baseband signals of different terminal devices in the first baseband signal onto the optical waves with different wavelengths in the first resonant light to obtain second resonant light. The step 2406 may include: the first terminal device demodulates the first electrical signal to obtain a first baseband signal, and then processes the first baseband signal to obtain first information.

Optionally, the first terminal device modulating the second information to the fourth resonance light to obtain the fifth resonance light may include: the first terminal device processes the second information to obtain a second baseband signal, and then modulates the second baseband signal to the fourth resonant light to obtain a fifth resonant light. The network device demodulating the second electrical signal to obtain the second information may include: the network device demodulates the second electrical signal to obtain a second baseband signal, and then processes the second baseband signal to obtain second information.

Optionally, step 2403 may include: the network device first amplifies the power of the second resonant light to obtain sixth resonant light, and then radiates the sixth resonant light in different directions according to the wavelength. The third resonant light is resonant light of the second resonant light that is radiated in the direction in which the first terminal device is located, and the third resonant light may be resonant light of the sixth resonant light that is radiated in the direction in which the first terminal device is located.

Optionally, the method may further include: the network device amplifies power of the second resonance light radiated to a different direction to obtain a seventh resonance light. The third resonant light is resonant light of the second resonant light that is radiated in the direction in which the first terminal device is located, and the third resonant light may be resonant light of the seventh resonant light that is radiated in the direction in which the first terminal device is located.

Optionally, the network device may include an emitter for emitting the resonant light, and the method may further include: the network device generates a first measurement signal, emits eighth resonant light according to the first measurement signal, modulates the first measurement signal to the eighth resonant light to obtain ninth resonant light, and radiates the ninth resonant light to different directions according to wavelength; the first terminal device reflects the tenth resonant light, generates a second measurement signal, and modulates the second measurement signal to the tenth resonant light to obtain eleventh resonant light, wherein the tenth resonant light is part of the ninth resonant light radiated in the direction of the first terminal device; the network device transmits part of the eleventh resonant light to obtain third laser light, converts the third laser light into a third electric signal, demodulates the third electric signal to obtain a second measuring signal, and adjusts the emission angle of the emitter according to the signal quality of the second measuring signal.

For the detailed description of the communication method, reference may be made to the description of the communication system above, which is not repeated herein.

Referring to fig. 25 based on the network architecture shown in fig. 11, fig. 25 is a schematic structural diagram of a communication device according to an embodiment of the present invention. The communication device may be a terminal device or a network device. As shown in fig. 25, the communication device may include a processor 2501, a memory 2502, an input interface 2503, an output interface 2504, and a bus 2505. The memory 2502 may be separate and may be coupled to the processor 2501 via the bus 2505. The memory 2502 may also be integrated with the processor 2501. Bus 2505 is used to enable connections between these components, among other things. The input interface 2503 is used for receiving information from a communication device other than the communication device, and the output interface 2504 is used for outputting information to a communication device other than the communication device. The computer programs stored in the memory 2502, when executed by the processor 2501, cause the processor 2501 to perform the communication method illustrated in fig. 24.

Referring to fig. 26, fig. 26 is a schematic structural diagram of another communication device according to an embodiment of the present invention based on the network architecture shown in fig. 11. As shown in fig. 26, the communication device may include an input interface 2601, a logic circuit 2602, and an output interface 2603. The input interface 2601 and the output interface 2603 are connected via a logic circuit 2602. The input interface 2601 is used for receiving information from another communication device, and the output interface 2603 is used for outputting information to another communication device. The logic circuit 2602 is configured to perform operations other than the operations of the input interface 2601 and the output interface 2603, for example, to realize the functions realized by the processor 2501 in the above-described embodiments. The communication device may be a terminal device or a network device. The more detailed description of the input interface 2601, the logic circuit 2602, and the output interface 2603 may be directly obtained by referring to the related description of the first terminal device in the method embodiment shown in fig. 24, or directly obtained by referring to the related description of the network device in the method embodiment shown in fig. 24, which is not described herein again.

The embodiment of the present invention further discloses a computer-readable storage medium, where a computer program is stored, and when the computer program runs, the communication method shown in fig. 24 is implemented.

The above-mentioned embodiments, objects, technical solutions and advantages of the present application are further described in detail, it should be understood that the above-mentioned embodiments are only examples of the present application, and are not intended to limit the scope of the present application, and any modifications, equivalent substitutions, improvements and the like made on the basis of the technical solutions of the present application should be included in the scope of the present application.

Claims

1. A communication system comprising a network device and one or more terminal devices, the network device comprising a transmitter, a first modulator, a diffraction grating, a second reflector, a second photodetector, and a second demodulator, the first terminal device comprising the first reflector, the first photodetector, the first demodulator, and the second modulator, the first terminal device being any one of the one or more terminal devices, wherein:

the transmitter is used for transmitting first resonant light according to information to be transmitted, wherein the information to be transmitted comprises first information, and the first information is information required to be transmitted to the first terminal equipment;

the first modulator is used for modulating information of different terminal devices in the information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light;

the diffraction grating is used for radiating the second resonant light to different directions according to wavelength;

the first reflector is configured to transmit a part of resonant light in third resonant light to obtain first laser light, where the third resonant light is resonant light in the second resonant light that is radiated in a direction where the first terminal device is located;

the first reflector is further configured to reflect fourth resonant light, where the fourth resonant light is resonant light of the third resonant light except for the first laser light;

the second modulator is used for modulating second information to the fourth resonant light to obtain fifth resonant light;

the second reflector is used for transmitting part of the fifth resonant light to obtain second laser light;

the first photoelectric detector is used for converting the first laser into a first electric signal;

the first demodulator is configured to demodulate the first electrical signal to obtain the first information;

the second photodetector is used for converting the second laser into a second electric signal;

the second demodulator is configured to demodulate the second electrical signal to obtain the second information.

2. The system of claim 1, wherein the network device further comprises an excitation source, wherein:

the excitation source is used for generating an excitation signal according to the information to be sent;

the transmitter transmitting first resonant light according to information to be transmitted includes:

the transmitter transmits first resonant light according to the excitation signal.

3. The system of claim 1, wherein the network device further comprises a first baseband transmission module, wherein the first terminal device further comprises a first baseband reception module, and wherein:

the first baseband sending module is configured to process the information to be sent to obtain a first baseband signal;

the transmitter transmitting the first resonant light according to the information to be transmitted comprises:

the first modulator modulates information of different terminal devices in the information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light, and the second modulator comprises:

the first modulator modulates baseband signals of different terminal devices in the first baseband signal onto optical waves with different wavelengths in the first resonant light to obtain second resonant light;

the first demodulator demodulates the first electrical signal to obtain the first baseband signal;

the first baseband receiving module is configured to process the first baseband signal to obtain the first information.

4. The system of claim 1, wherein the network device further comprises a second baseband receiving module, and wherein the first terminal device further comprises a second baseband transmitting module, wherein:

the second baseband sending module is configured to process the second information to obtain a second baseband signal;

the second modulator modulating second information to the fourth resonance light to obtain fifth resonance light includes:

the second demodulator demodulates the second electrical signal to obtain the second baseband signal;

the second baseband receiving module is configured to process the second baseband signal to obtain the second information.

5. The system of any of claims 1-4, wherein the network device further comprises a gain medium, wherein:

the gain medium is used for amplifying the power of the second resonant light to obtain sixth resonant light;

the diffraction grating radiates the sixth resonant light to different directions by wavelength;

the third resonant light is resonant light of the second resonant light radiated in the direction of the first terminal device, and the third resonant light includes:

the third resonant light is resonant light radiated in the direction of the first terminal device in the sixth resonant light.

6. The system of any of claims 1-4, wherein the network device further comprises a gain medium, wherein:

the gain medium is used for amplifying the power of the second resonant light radiated to different directions to obtain seventh resonant light;

the third resonant light is resonant light radiated in the direction of the first terminal device in the seventh resonant light.

7. The system of claim 1, wherein the network device further comprises a first alignment measurement module, wherein the terminal device further comprises a second alignment measurement module, and wherein:

the first alignment measurement module is used for generating a first measurement signal;

the transmitter is further used for transmitting eighth resonant light according to the first measuring signal;

the first modulator is further used for modulating the first measuring signal to the eighth resonant light to obtain ninth resonant light;

the diffraction grating is also used for radiating the ninth resonant light to different directions according to the wavelength;

the first reflector is further configured to reflect tenth resonant light, where the tenth resonant light is a part of the resonant light radiated in a direction in which the first terminal device is located, of the ninth resonant light;

the second alignment measurement module is used for generating a second measurement signal;

the second modulator is further configured to modulate the second measurement signal to the tenth resonant light to obtain eleventh resonant light;

the second reflector is further used for transmitting part of the eleventh resonant light to obtain third laser light;

the second photodetector is further used for converting the third laser into a third electric signal;

the second demodulator is further configured to demodulate the third electrical signal to obtain the second measurement signal;

the first alignment measurement module is further configured to adjust a transmission angle of the transmitter according to the signal quality of the second measurement signal.

8. A communication method applied to a communication system including a network device and one or more terminal devices, the method comprising:

the network equipment transmits first resonant light according to information to be transmitted, modulates information of different terminal equipment in the information to be transmitted to light waves with different wavelengths in the first resonant light to obtain second resonant light, and radiates the second resonant light to different directions according to the wavelengths, wherein the information to be transmitted comprises first information, the first information is information needing to be transmitted to first terminal equipment, and the first terminal equipment is any one of the one or more terminal equipment;

the first terminal device transmits part of the third resonant light to obtain first laser, converts the first laser into a first electric signal, demodulates the first electric signal to obtain the first information, and the third resonant light is the resonant light radiated in the direction of the first terminal device in the second resonant light;

the first terminal equipment reflects fourth resonant light, modulates second information to the fourth resonant light to obtain fifth resonant light, and emits the fifth resonant light, wherein the fourth resonant light is resonant light except the first laser light in the third resonant light;

and the network equipment transmits part of the fifth resonant light to obtain second laser, converts the second laser into a second electric signal, and demodulates the second electric signal to obtain second information.

9. The method of claim 8, wherein the network device emitting the first resonant light according to the information to be transmitted comprises:

and the network equipment generates an excitation signal according to the information to be sent and sends first resonant light according to the excitation signal.

10. The method according to claim 8, wherein the network device transmits a first resonant light according to information to be transmitted, and the step of modulating information of different terminal devices in the information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain a second resonant light comprises:

the network equipment processes the information to be sent to obtain a first baseband signal, transmits first resonant light according to the first baseband signal, and modulates baseband signals of different terminal equipment in the first baseband signal onto optical waves with different wavelengths in the first resonant light to obtain second resonant light;

the first terminal device demodulating the first electrical signal to obtain the first information comprises:

the first terminal device demodulates the first electrical signal to obtain the first baseband signal, and processes the first baseband signal to obtain the first information.

11. The method of claim 8, wherein the first terminal device modulating second information to the fourth resonant light to obtain fifth resonant light comprises:

the first terminal device processes second information to obtain a second baseband signal, and modulates the second baseband signal to the fourth resonant light to obtain fifth resonant light;

the network device demodulating the second electrical signal to obtain the second information comprises:

the network device demodulates the second electrical signal to obtain the second baseband signal, and processes the second baseband signal to obtain the second information.

12. The method according to any one of claims 8-11, wherein the network device radiating the second resonant light to different directions by wavelength comprises:

the network device amplifies power of the second resonant light to obtain sixth resonant light, and radiates the sixth resonant light to different directions according to wavelength;

13. The method according to any one of claims 8-11, further comprising:

the network device amplifies power of the second resonant light radiated to a different direction to obtain seventh resonant light;

14. The method of claim 8, wherein the network device comprises an emitter for emitting resonant light, the method further comprising:

the network device generates a first measurement signal, emits eighth resonant light according to the first measurement signal, modulates the first measurement signal to the eighth resonant light to obtain ninth resonant light, and radiates the ninth resonant light to a different direction according to wavelength;

the first terminal device reflects tenth resonant light, generates a second measurement signal, and modulates the second measurement signal to the tenth resonant light to obtain eleventh resonant light, wherein the tenth resonant light is part of the ninth resonant light radiated in the resonant light in the direction of the first terminal device;

the network device transmits part of the eleventh resonant light to obtain third laser light, converts the third laser light into a third electric signal, demodulates the third electric signal to obtain the second measuring signal, and adjusts the emission angle of the emitter according to the signal quality of the second measuring signal.

15. A communication method applied to a network device, the network device communicating with one or more terminal devices, the method comprising:

transmitting first resonant light according to information to be transmitted, wherein the information to be transmitted comprises first information, the first information is information required to be transmitted to first terminal equipment, and the first terminal equipment is any one of the one or more terminal equipment;

modulating information of different terminal devices in the information to be transmitted to light waves with different wavelengths in the first resonant light to obtain second resonant light;

radiating the second resonant light to different directions according to wavelength, the second resonant light being used for the first terminal device to transmit a part of resonant light in third resonant light to obtain first laser light, converting the first laser light into a first electric signal, demodulating the first electric signal to obtain the first information, the third resonant light being resonant light of the second resonant light radiated in the direction of the first terminal device, the second resonant light being further used for the first terminal device to reflect fourth resonant light, modulating second information to the fourth resonant light to obtain fifth resonant light, and emitting the fifth resonant light, the fourth resonant light being resonant light of the third resonant light except for the first laser light;

transmitting part of the fifth resonant light to obtain second laser light;

converting the second laser light into a second electrical signal;

demodulating the second electrical signal to obtain the second information.

16. The method of claim 15, wherein the emitting the first resonant light according to the information to be transmitted comprises:

generating an excitation signal according to the information to be sent;

emitting first resonant light according to the excitation signal.

17. The method of claim 15, wherein the emitting the first resonant light according to the information to be transmitted comprises:

processing the information to be transmitted to obtain a first baseband signal;

transmitting first resonance light according to the first baseband signal;

the modulating information of different terminal devices in the information to be transmitted onto light waves with different wavelengths in the first resonant light to obtain second resonant light comprises:

modulating baseband signals of different terminal devices in the first baseband signal onto light waves with different wavelengths in the first resonant light to obtain second resonant light;

the first terminal device demodulating the first electrical signal to obtain the first information includes:

18. The method of claim 15, wherein the first terminal device modulating second information to the fourth resonant light to obtain fifth resonant light comprises:

the first terminal device processes the second information to obtain a second baseband signal, and modulates the second baseband signal to the fourth resonant light to obtain fifth resonant light;

the demodulating the second electrical signal to obtain the second information comprises:

demodulating the second electrical signal to obtain the second baseband signal;

processing the second baseband signal to obtain the second information.

19. The method according to any one of claims 15 to 18, wherein said radiating the second resonant light in different directions by wavelength comprises:

amplifying the power of the second resonant light to obtain sixth resonant light;

radiating the sixth resonant light to different directions by wavelength;

20. The method according to any one of claims 15-18, further comprising:

amplifying power of the second resonant light radiated to a different direction to obtain seventh resonant light;

21. A communication method is applied to a first terminal device, wherein the first terminal device is any one of one or more terminal devices which communicate with a network device, and the method comprises the following steps:

receiving third resonant light from the network device, where the third resonant light is resonant light that is radiated in a direction where the first terminal device is located in second resonant light that is radiated in different directions by the network device according to a wavelength, the second resonant light is resonant light that is obtained after the network device modulates information of different terminal devices in information to be sent onto light waves with different wavelengths in first resonant light, the first resonant light is resonant light that is transmitted by the network device according to the information to be sent, and the information to be sent includes first information;

transmitting a part of the third resonant light to obtain first laser light;

converting the first laser light into a first electrical signal;

demodulating the first electrical signal to obtain the first information;

reflecting fourth resonance light which is resonance light except the first laser light in the third resonance light;

modulating second information to the fourth resonance light to obtain fifth resonance light;

and emitting the fifth resonant light, wherein the fifth resonant light is used for transmitting part of the fifth resonant light by the network equipment to obtain second laser, converting the second laser into a second electric signal, and demodulating the second electric signal to obtain the second information.

22. The method of claim 21, wherein the first resonant light is a resonant light emitted by the network device according to the information to be transmitted, comprising:

the first resonant light is resonant light emitted by the network device according to an excitation signal, and the excitation signal is generated by the network device according to the information to be sent.

23. The method according to claim 21, wherein the first resonant light is a resonant light emitted by the network device according to the information to be transmitted, comprising:

the first resonant light is resonant light emitted by the network device according to a first baseband signal, and the first baseband signal is obtained by processing the information to be sent by the network device;

the second resonant light is obtained after the network device modulates information of different terminal devices in information to be sent onto light waves with different wavelengths in the first resonant light, and the second resonant light includes:

the second resonant light is resonant light obtained after the network device modulates baseband signals of different terminal devices in the first baseband signal onto light waves with different wavelengths in the first resonant light;

the demodulating the first electrical signal to obtain the first information comprises:

demodulating the first electrical signal to obtain the first baseband signal;

processing the first baseband signal to obtain the first information.

24. The method of claim 21, wherein modulating the second information to the fourth resonant light to obtain a fifth resonant light comprises:

processing the second information to obtain a second baseband signal;

modulating the second baseband signal to the fourth resonating light to obtain fifth resonating light;

25. The method as claimed in any one of claims 21 to 24, wherein the third resonant light is a resonant light radiated in a direction in which the first terminal device is located among second resonant lights radiated in different directions by the network device according to wavelengths, and comprises:

the third resonant light is resonant light radiated in a direction in which the first terminal device is located in sixth resonant light radiated in different directions by the network device according to wavelength, and the sixth resonant light is resonant light obtained by amplifying power of the second resonant light by the network device.

26. The method as claimed in any one of claims 21 to 24, wherein the third resonant light is a resonant light radiated in a direction in which the first terminal device is located among second resonant lights radiated in different directions by the network device according to wavelengths, and comprises:

the third resonant light is resonant light radiated in the direction of the first terminal device from seventh resonant light radiated to different directions by the network device according to wavelength, and the seventh resonant light is resonant light obtained by amplifying power of the second resonant light radiated to different directions by the network device.