CN110855356B - Resonance wave beam communication device based on detection feedback control - Google Patents
Resonance wave beam communication device based on detection feedback control Download PDFInfo
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- CN110855356B CN110855356B CN201911001138.2A CN201911001138A CN110855356B CN 110855356 B CN110855356 B CN 110855356B CN 201911001138 A CN201911001138 A CN 201911001138A CN 110855356 B CN110855356 B CN 110855356B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
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Abstract
The invention relates to a resonance wave beam communication device based on detection feedback control, which comprises a host machine and a slave machine which jointly form a free space resonant cavity, wherein a second retro-reflector is arranged in the slave machine, the host machine comprises a first retro-reflector, a power amplifier and a signal processing module, the signal processing module comprises a beam splitter, a detector, a signal processor and a modulator which are sequentially connected, the first retro-reflector, the power amplifier, the beam splitter and the modulator are sequentially arranged along a resonance wave beam path, the detector receives a sample light beam which is split by the beam splitter according to a set proportion from the resonance wave beam between the host machine and the slave machine and outputs an electric signal, and the signal processor receives the electric signal output by the detector and an input signal carrying information and sends a control signal to the modulator. Compared with the prior art, the invention has the advantages of ultrahigh-speed communication, mobility, high safety and the like.
Description
Technical Field
The invention relates to the field of high-speed communication of optical resonance beams, in particular to a resonance beam communication device based on detection feedback control.
Background
The current 5G communication aims to achieve ms-class delay, hundreds of device connections, and peak rates of tens of Gbps, with corresponding carrier frequencies at tens of GHz. However, the demand after 5G may be higher. It is stated that the transmission rate required to achieve high definition holographic projection for a single person will reach 4.62Tbps, which requires carriers to reach levels above THz. In this case, the conventional 5G technology has been difficult to satisfy. On the other hand, in the conventional wireless communication method, the electromagnetic radiation power propagated in the air needs to be limited to a safe range. Therefore, the received power of the conventional wireless communication receiver has a lower upper limit, which leads to the limitation of the channel capacity to a lower level according to shannon theory, and the application requirements after 5G are difficult to meet.
The wireless communication device based on the distributed optical resonant cavity disclosed in the chinese invention patent 201711063529.8 realizes the communication function, and describes the devices and methods for realizing modulation, reception, optical path control, etc. of communication on the structure of the distributed optical resonant cavity. The patent application No. 201811209197.4 of chinese invention discloses an energy-carrying communication device based on resonant light beams, which describes a system structure, a modulation method, a circuit of an energy and information branching module, etc. based on cooperative transmission of energy and information of a distributed optical resonant cavity, but the above two patents cannot eliminate the problems of echo interference, etc. caused by high-speed modulation.
Disclosure of Invention
The present invention is directed to a resonant beam communication device based on detection feedback control, which overcomes the above-mentioned drawbacks of the prior art.
The purpose of the invention can be realized by the following technical scheme:
a resonance wave beam communication device based on detection feedback control comprises a host and a slave which jointly form a free space resonant cavity, wherein a second retro-reflector is arranged in the slave, the host comprises a first retro-reflector, a power amplifier and a signal processing module, the signal processing module comprises a beam splitter, a detector, a signal processor and a modulator which are sequentially connected, the first retro-reflector, the power amplifier, the beam splitter and the modulator are sequentially arranged along a resonance wave beam path, the detector receives a sample light beam which is split by the beam splitter from the resonance wave beam between the host and the slave according to a set proportion and outputs an electric signal, and the signal processor receives the electric signal output by the detector and an input signal carrying information and sends a control signal to the modulator.
The first retro-reflector and the second retro-reflector are cat-eye reflectors, telecentric cat-eye reflectors or corner reflectors for retro-reflecting light waves and terahertz electromagnetic waves and arrays thereof, or are direction retro-antenna arrays for retro-reflecting microwaves and radio frequency waves.
The host machine also comprises a delayer arranged on a path of the resonance beam between the beam splitter and the modulator, and the delayer is used for increasing the propagation speed of the resonance beam from the beam splitter to the modulator, so that the time of the sample beam split by the beam splitter reaching the modulator after being converted into the control signal is consistent with the time of the split resonance beam reaching the modulator.
The host machine also comprises a plurality of reflecting mirrors arranged on a path of the resonance beam between the beam splitter and the modulator, and the time of the sample beam split by the beam splitter reaching the modulator is prolonged by increasing the propagation path of the split resonance beam, so that the time of the sample beam after being converted into a control signal reaching the modulator is consistent with the time of the split resonance beam reaching the modulator.
The signal processor comprises a divider, a conversion and driver, and the detector, the divider, the conversion and driver and the modulator are sequentially connected.
First retro-reflector constitute by the first speculum and the first lens of mutual parallel arrangement, the inboard focal plane coincidence setting of first speculum and first lens, power amplifier set up in the outside pupil position department of first lens, for realizing the beam collimation, the host computer in be equipped with the collimation chamber that constitutes by second lens and third lens, the signal processing module set up in the collimation intracavity.
The first retro-reflector is composed of a first reflector and a first lens which are arranged in parallel, in order to reduce the size of the main machine, the signal processing module is arranged between the first reflector and the first lens, and the power amplifier is arranged at the position of an outer pupil of the first lens.
The first retro-reflector is composed of a first reflector and a first lens which are arranged in parallel, the signal processing module is arranged between the first reflector and the first lens, and in order to further reduce the size of the host, the power amplifier is arranged between the first reflector and the signal processing module.
And a detection and demodulation device is also arranged in the slave machine, and the detection and demodulation device is arranged behind the second retro-reflector and receives the resonance beam or receives the resonance beam through a beam splitter.
In order to realize bidirectional communication, a signal processing module is arranged in front of a second retro-reflector in the slave.
Compared with the prior art, the invention has the following advantages:
the method and the device for transmitting high-speed information are designed based on detection and feedback control of a free space wave beam resonant cavity and matched with a signal processing module. Based on the characteristics of the free space wave beam resonant cavity, the host and the slave can carry out bidirectional communication at a longer distance, in addition, the host and the slave can move, a communication link is kept uninterrupted, or can be quickly recovered after interruption, a resonant wave beam is spontaneously established between the host and the slave, and power transmission above watt level can be realized. Therefore, the system has the characteristic of high signal-to-noise ratio communication. The invention can immediately block the resonance of the wave beam when foreign matters invade the cavity due to the safety characteristic of the free space wave beam resonant cavity, and avoids the damage of the high-power wave beam to the invaded object.
Drawings
Fig. 1 is a schematic diagram of a core structure of a resonant beam communication device based on detection feedback control.
Fig. 2 is a schematic diagram of a host structure incorporating a delay.
Fig. 3 is a schematic diagram of a mirror-based time delay structure.
Fig. 4 is a schematic diagram of an internal structure of the signal processor.
Fig. 5 is a schematic design diagram of adding collimating structures in the beam path.
Fig. 6 is a schematic design diagram of the modulation device inside the retro-reflector.
Fig. 7 is a schematic diagram of a power amplifier design within a retro-reflector.
FIG. 8 is a schematic diagram of a detection demodulation design of a partially transmitted resonant beam of a retro-reflector.
Fig. 9 is a schematic diagram of a detection demodulation design for extracting a signal from a resonant beam using a beam splitter.
Fig. 10 is a schematic diagram of a bi-directional communication scheme.
The notation in the figure is:
1. master, 2, slave, 3, resonant beam, 11, first retro-reflector, 12, power amplifier, 13, beam splitter, 14, modulator, 15, detector, 16, signal processor, 161, divider, 162, switch and driver, 171, delay, 172, mirror, 181, first lens, 182, second lens, 183, third lens, 19, first mirror, 21, second retro-reflector, 22, detection and demodulator.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Example 1
As shown in fig. 1, fig. 1 shows a core structure of a resonant beam communication device based on detection feedback control, and the present invention provides a resonant beam communication device based on detection feedback control, which includes a master 1 and a slave 2. The master 1 includes a first retro-reflector 11 and a power amplifier 12 disposed in this order, and the slave 2 includes a second retro-reflector 21. The master 1 and the slave 2 together form a free space resonant cavity. The space between the master 1 and the slave 2 is free space. A resonant beam 3 is naturally generated between the first retro-reflector 11 and the second retro-reflector 21. Also included within the main body 1 is a beam splitter 13 and a modulator 14 placed in series in the path of the resonant beam between the power amplifier 12 and the second retro-reflector 21. Also included in the host computer 1 is a detector 15 for receiving the light beam split by the beam splitter 13 and outputting an electrical signal to a signal processor 16. A signal processor 16 within the host 1 receives the signal output by the detector 15 and the input signal carrying the information and sends a control signal to the modulator 14.
The retro-reflector is a device capable of generating retro-reflection for electromagnetic beams of various frequency bands including light waves, terahertz waves, microwaves, radio frequencies and the like, and includes, but is not limited to, a cat-eye reflector, a telecentric cat-eye reflector and a corner reflector for performing retro-reflection on the light waves and the terahertz waves, and also includes a directional retro-reflection antenna array for performing retro-reflection on the microwaves and the radio frequency waves. Any beam incident on the retro-reflector will be reflected back in the opposite direction to the incident beam path, the reflected beam path being parallel to the incident beam path but the reflected wave propagation direction being opposite to the incident wave propagation direction.
The power amplifier 12 includes, but is not limited to, devices for power amplifying light waves and terahertz waves, and also includes antenna arrays and power amplifying circuits for power amplifying microwave and radio frequency waves. Devices for power amplification of light wave band beams such as ultraviolet, visible light, infrared and the like include laser gain media, semiconductor materials, optical fiber power amplifiers and the like. Among them, gain media such as ruby, neodymium-doped yttrium aluminum garnet (Nd: YAG), neodymium-doped yttrium vanadate (Nd: YVO4), and the like; semiconductors such as doped gallium arsenide (GaAs), cadmium sulfide (CdS), indium phosphide (InP), zinc sulfide (ZnS), and the like; the optical fiber power amplifier may be, for example, an erbium-doped fiber power amplifier (EDFA), a praseodymium-doped fiber power amplifier (PDFA), a niobium-doped fiber power amplifier (NDFA), or the like.
The resonance wave beam 3 is an electromagnetic wave beam formed in a free space wave beam resonance cavity spontaneously, and comprises frequency bands of light waves, terahertz, microwaves, radio frequencies and the like. The electromagnetic wave transmitted from the master 1 to the slave 2 and the electromagnetic wave propagated from the slave 2 to the master 1 together form a resonant beam 3.
The beam splitter 13 is capable of splitting an incident beam into two or more beams, the split beams having different propagation directions. In the core patent structure, the beam splitter 13 splits a single beam from the beam propagating from the master 1 to the slave 2 in a certain power ratio to be used as a sample beam, and transmits the sample beam to the detector 15. The detector 15 may detect optical parameters of the sample beam including light intensity, power, amplitude, frequency, phase, polarization, etc., and output a corresponding detection signal.
The signal processor 16 converts the input signal carrying the information so as to send a reasonable control signal to the modulator 14 so that the input signal is correctly and reasonably modulated onto the resonant beam 3. The output of the signal processor 16 is also dependent on the detection signal sent by the detector 15 to the signal processor 16. The function of the signal processor 16 also includes power amplification to meet the power, voltage or current requirements of the control signal output to the modulator 14. The function of the signal processor 16 also includes dc biasing, i.e., including a dc signal in the control signal, to control the operating point of the modulator 14. The function of the signal processor 16 also includes non-linearity compensation to account for non-linear effects of the modulator 14.
The core structure of the resonant beam communication apparatus based on the detection feedback control detects a beam incident on the modulator 14, and applies a control signal to the modulator 14 based on the detection result. The scheme overcomes the interference problem generated by the echo in the cavity, and avoids the influence of the signal sent out at the previous moment on the modulation and transmission of the subsequent information. The scheme is particularly suitable for high-speed communication application based on a resonance beam device.
Example 2
As shown in fig. 2, based on the structure in fig. 1, a time delay 171 is added between the beam splitter 13 and the modulator 14 to increase the propagation speed of the beam from the beam splitter 13 toward the modulator 14. The retarder 171 may be composed of some transparent crystalline substance. The beam splitter 13 splits the beam transmitted from the host 1 to the slave 2 into two paths, wherein one path is input to the modulator 14 after passing through the time delay device 171, and the other path is transmitted through a circuit with a certain length after being influenced by the electrical signal converted by the detector on the modulator 14. The time it takes for the two beams to drop out of the beam splitter 13 until they affect the modulator 14 is not the same. The delay unit 171 delays the propagation of the beam for a certain time, so that the two signals are transmitted in the same time.
Example 3
As shown in fig. 3, fig. 3 illustrates a structure of the retarder 171 implemented based on the mirror 172. The retarder 171 may be specifically formed by at least one mirror 172. The mirror 172 includes a planar or curved mirror 172. The travel path of the resonant beam 3 is increased by the mirror 172, thereby extending the time for the beam to travel from the beam splitter 13 to the modulator 14. In fig. 3, the path of the resonant beam 3 is changed into a folded form by two mirrors 172, thereby extending the time for the resonant beam 3 to travel. In this design, the propagation path of the signal through the detector 15 and the signal processor 16 is minimized to shorten the time for the signal to propagate to the modulator 14.
Example 4
The device structure of fig. 4 is based on the structure of fig. 1, i.e. the divider 161 and the conversion and driver 162 together form the signal processor 16. The detection signal output by the detector 15 is divided by the divider 161 with the input signal having its value as dividend and the detection signal having its value as divisor. The switching and driver 162 receives the signal output from the divider 161 and outputs a control signal to the modulator 14 accordingly. The switching and driving unit 162 has functions of offset, nonlinear compensation, power or voltage amplification, and the like.
Example 5
Fig. 5 illustrates a structure in which a lens is added to a beam propagation path to achieve beam collimation. In the main unit 1, the first retro-reflector 11 is specifically designed as a cat-eye retro-reflective structure composed of a first mirror 19 and a first lens 181. The first reflecting mirror 19 is parallel to the first lens 181 and coincides with the lens focal plane. At this time, a pupil is formed at the other side focal point of the first lens 181. The beam incident through the pupil may be retroreflected. A power amplifier 12 is located at the pupil position of the first retro-reflector 11. The second lens 182 and the third lens 183 together form a collimating cavity, wherein the focal point of the second lens 182 coincides with the pupil of the first retro-reflector 11. In this case, any light beams entering the collimating cavity through the pupil are approximately parallel to the optical axis of the collimating cavity, and these light beams pass through the focal point outside the third lens 183. Conversely, the light beams entering the collimating cavity from the focal point of the third lens 183 are also parallel to the optical axis of the collimating cavity and both pass through the pupil of the first retro-reflector 11. The beam splitter 13 and the modulator 14 are located in a collimating cavity formed by the second lens 182 and the third lens 183. This embodiment determines the direction of the beam passing through the beam splitter 13 and modulator 14 such that the beam direction is at a fixed angle to the plane of the beam splitter 13 and parallel to the optical axis of the modulator 14. This design ensures the power ratio of the beam splitter 13 to the beam splitting.
Example 6
In the embodiment shown in fig. 6, the beam splitter 13 and the modulator 14 are located inside the structure of the first retro-reflector 11 formed by the first mirror 19 and the first lens 181. The power amplifier 12 is at a focal point outside the first lens 181, i.e., at the pupil of the first retro-reflector 11. Because the internal light of the cat eye retro-reflective structure is approximately parallel to the optical axis, the requirements of the beam splitter 13 and the modulator 14 on the fixed light beam direction can be met. On the other hand, all the light beams pass through the power amplifier 12 at the pupil of the first retro-reflective structure, which reduces the cost of the power amplifier 12 and increases its operating efficiency. This embodiment can make the size of the main body 1 smaller and the devices more compact.
Example 7
As in the embodiment shown in fig. 7, the power amplifier 12 may also be located inside the first retro-reflector 11, i.e. between the first mirror 19 and the beam splitter 13. The design can further reduce the structural volume of the host 1, and the distribution of the devices is more compact. The power amplifier 12 in this embodiment is not located at the pupil of the first retro-reflector 11. In this case, the light beams incident on the main body 1 in different directions pass through different portions of the side surface of the power amplifier 12, and the energy of the other portions other than the portions through which the light beams pass is converted into heat and dissipated, so that the power amplifier 12 operates less efficiently than the structure shown in fig. 6.
Example 8:
as shown in fig. 8, the second retro-reflector 21 in the slave 2 has a certain transmittance. A proportion of the beam propagating to the right in the resonant beam 3 will pass through the second retro-reflector 21 and be received by the detector and demodulator 22 placed behind the retro-reflector. The information signal carried by the light beam is recovered through conversion and demodulation by the detection and demodulator 22.
From the receiver design of fig. 9, the input beam of the detection and demodulator 22 is extracted from the resonant beam 3 by the beam splitter 13. A second retro-reflector 21 having a very high reflectivity is used. The advantage of this scheme is that structures such as collimation cavity can be utilized, the constant included angle between resonance beam 3 and beam splitter 13 is guaranteed under any circumstances. Compared with the structure shown in fig. 8, the beam intensity received by the detection and demodulation unit 22 is more stable in the present embodiment.
Example 9
Based on the core structure shown in fig. 1, some elements may be added to implement bidirectional communication. As shown in fig. 10, the modulator 14 and the beam splitter 13 are added to the slave 2, and the beam splitter 13 is connected to the detector 15 and the signal processor 16, so that the slave 2 can transmit information to the master 1. The input signal from the slave 2 can be modulated onto the resonant beam 3 and detected in the master 1. In the master 1, a beam splitter 13 may be added to extract the modulated beam from the slave 2 to the master 1, and perform conversion and demodulation.
Claims (6)
1. A resonance wave beam communication device based on detection feedback control comprises a host (1) and a slave (2) which jointly form a free space resonant cavity, wherein a second retro-reflector (21) is arranged in the slave (2), and is characterized in that the host (1) comprises a first retro-reflector (11), a power amplifier (12) and a signal processing module, the signal processing module comprises a beam splitter (13), a detector (15), a signal processor (16) and a modulator (14) which are sequentially connected, the first retro-reflector (11), the power amplifier (12), the beam splitter (13) and the modulator (14) are sequentially arranged along a resonance wave beam path, the detector (15) receives a sample light beam which is split by the beam splitter (13) according to a set proportion from a resonance wave beam between the host (1) and the slave (2) and outputs an electric signal, the signal processor (16) receives an electric signal output by the detector (15) and an input signal carrying information and sends a control signal to the modulator (14), and the first retro-reflector (11) and the second retro-reflector (21) are a cat eye reflector, a telecentric cat eye reflector or a corner reflector and an array thereof for performing retro-reflection on light waves and terahertz electromagnetic waves, or a direction retro-antenna array for performing retro-reflection on microwaves and radio frequency waves;
the first retro-reflector (11) is composed of a first reflector (19) and a first lens (181) which are arranged in parallel, the first reflector (19) and the inner focal plane of the first lens (181) are arranged in a superposed mode, the power amplifier (12) is arranged at the outer pupil position of the first lens (181), in order to achieve beam collimation, a collimation cavity composed of a second lens (182) and a third lens (183) is arranged in the main machine (1), and the signal processing module is arranged in the collimation cavity;
the first retro-reflector (11) is composed of a first reflecting mirror (19) and a first lens (181) which are arranged in parallel, in order to reduce the volume of the main machine, the signal processing module is arranged between the first reflecting mirror (19) and the first lens (181), and the power amplifier (12) is arranged at the position of an outer pupil of the first lens (181);
the first retro-reflector (11) is composed of a first reflecting mirror (19) and a first lens (181) which are arranged in parallel, the signal processing module is arranged between the first reflecting mirror (19) and the first lens (181), and in order to further reduce the size of the main machine, the power amplifier (12) is arranged between the first reflecting mirror (19) and the signal processing module.
2. A resonant beam communication device based on detection feedback control according to claim 1, wherein the host (1) further comprises a delay unit (171) disposed on the path of the resonant beam between the beam splitter (13) and the modulator (14) for increasing the propagation speed of the resonant beam from the beam splitter (13) to the modulator (14), so that the time of the sample beam split by the beam splitter (13) arriving at the modulator (14) after being converted into the control signal is consistent with the time of the split resonant beam arriving at the modulator (14).
3. The apparatus according to claim 1, wherein the main unit (1) further comprises a plurality of mirrors (172) disposed on the path of the resonance beam between the beam splitter (13) and the modulator (14), and the propagation path of the split resonance beam is increased to extend the time of reaching the modulator (14), so that the time of reaching the modulator (14) after the sample beam split by the beam splitter (13) is converted into the control signal is consistent with the time of reaching the modulator (14) by the split resonance beam.
4. A resonant beam communication device based on detection feedback control according to claim 1, characterized in that the signal processor (16) comprises a divider (161) and a switch and driver (162), and the detector (15), the divider (161), the switch and driver (162) and the modulator (14) are connected in sequence.
5. A resonant beam communication device based on detection feedback control according to claim 1, characterized in that the slave (2) is further provided with a detection and demodulator (22), and the detection and demodulator (22) is arranged behind the second retro-reflector (21) to receive the resonant beam or receives the resonant beam through a beam splitter.
6. A resonant beam communication device based on detection feedback control according to claim 1, characterized in that, for bidirectional communication, a signal processing module is provided in front of the second retro-reflector (21) in the slave (2).
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| CN114553317A (en) * | 2020-11-25 | 2022-05-27 | 华为技术有限公司 | Communication method and device of communication system based on distributed resonant cavity laser |
| CN113517905B (en) * | 2021-04-23 | 2022-08-26 | 清华大学 | Microwave transmission system and method |
| CN113676248B (en) * | 2021-07-22 | 2022-02-08 | 香港中文大学（深圳） | Resonance optical communication device based on echo interference elimination |
| CN113541815B (en) * | 2021-09-16 | 2021-12-21 | 香港中文大学（深圳） | Resonant optical communication device and method based on gain control |
| CN113691345B (en) * | 2021-10-22 | 2022-02-08 | 香港中文大学（深圳） | Multi-user resonance optical communication system and method based on optical code division multiple access |
| CN116224364B (en) * | 2023-05-09 | 2023-08-01 | 中国人民解放军63921部队 | Three-dimensional imaging system, method, device, equipment and storage medium |
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