阅读说明：本技术 一种基于回波干扰消除的共振光通信装置 (Resonance optical communication device based on echo interference elimination ) 是由 黄川� 崔曙光 田源明 李东旭 于 2021-07-22 设计创作，主要内容包括：本发明公开了一种基于回波干扰消除的共振光通信装置,包括形成分布式光学谐振腔的主机(1)和从机(2)；所述主机包括第一光电探测器(151)、同步装置(152),以及设置在光束路径上的第一回复反射器(11)、第一增益介质(12)、第一分束器(13)、电光调制器(14)；所述第一回复反射器(11)用于将入射光按照原入射方向进行反射；所述第一分束器(13)用于将经过第一增益介质(12)增益后的出射光进行分束；所述同步装置(152),用于产生发送信号输入到电光调制器(14),并控制发送信号的产生时间,以使得每个周期发送的信号实现符号同步。本发明在同步装置(152)中,使用计时器来实现符号同步,进而有效消除了回波干扰。(The invention discloses a resonance optical communication device based on echo interference elimination, which comprises a host (1) and a slave (2) which form a distributed optical resonant cavity; the host comprises a first photodetector (151), a synchronization device (152), and a first recovery reflector (11), a first gain medium (12), a first beam splitter (13), an electro-optical modulator (14) arranged in the path of the light beam; the first recovery reflector (11) is used for reflecting incident light according to the original incident direction; the first beam splitter (13) is used for splitting emergent light which is gained by the first gain medium (12); the synchronization device (152) is used for generating a transmission signal to be input to the electro-optical modulator (14) and controlling the generation time of the transmission signal so that the signal transmitted in each period realizes symbol synchronization. In the synchronization device (152), the invention uses a timer to realize symbol synchronization, thereby effectively eliminating echo interference.)

1. A resonance optical communication device based on echo interference elimination is characterized in that: the device comprises a host (1) and a slave (2) which form a distributed optical resonant cavity; the host comprises a first photodetector (151), a synchronization device (152), and a first recovery reflector (11), a first gain medium (12), a first beam splitter (13), an electro-optical modulator (14) arranged in the path of the light beam; the slave machine (2) comprises a second photoelectric detector (241), a signal processing board (242), and a second retro-reflector (23), a second gain medium (22) and a second beam splitter (21) which are arranged on a light beam path;

the first recovery reflector (11) is used for reflecting incident light according to the original incident direction; the second retro-reflector (23) is used for reflecting incident light according to the original incident direction; the resonant cavity of the resonant optical communication device is located between the first retro-reflector (11) and the second retro-reflector (23);

the first beam splitter (13) is used for splitting the emergent light which is gained by the first gain medium (12) to obtain a beam of transmitted light and a beam of reflected light, the reflected light obtained by splitting the beam is transmitted to the first photoelectric detector (151), and the reflected light is subjected to photoelectric conversion by the first photoelectric detector (151) and then transmitted to the synchronizing device (152); the transmitted light obtained by beam splitting is transmitted to an electro-optical modulator (14);

the synchronization device (152) is used for generating a transmission signal to be input into the electro-optical modulator (14) and controlling the generation time of the transmission signal so that the signal transmitted in each period realizes symbol synchronization;

and the electro-optical modulator (14) is used for modulating the transmitted light from the first optical beam splitter (13) and the signal from the synchronization device and then transmitting the modulated light to the slave (2).

2. A resonant optical communication device based on echo cancellation according to claim 1, wherein: the second beam splitter (21) is used for splitting the incident light received from the host (1) to obtain a beam of transmitted light and a beam of reflected light; reflected light obtained by beam splitting is transmitted to a signal processing board (242) through a second photoelectric detector (241); the transmitted light resulting from the beam splitting is transmitted via a second gain medium (22) to a second retro-reflector (23).

3. A resonant optical communication device based on echo cancellation according to claim 1, wherein: the synchronization means (152) are FPGA units.

4. A resonant optical communication device based on echo cancellation according to claim 1, wherein: an ADC module is arranged between the synchronization device (152) and the first photoelectric detector (151).

5. A resonant optical communication device based on echo cancellation according to claim 1, wherein: the synchronization device (152) comprises an initial configuration module, a synchronization module and a control module, wherein the initial configuration module is used for generating an electric signal as a marking signal when the host (1) and the slave (2) communicate for the first time, so that the output light intensity of the electro-optical modulator (14) is close to 0; a timing timer is started while the electrical signal is inputted to the electro-optical modulator by the synchronizing means (152), and the clock of the timer is set to 20 times the transmission rate.

6. A resonant optical communication device based on echo cancellation according to claim 5, wherein: the synchronizing device also comprises a mark detection module, when output light reaches the host (1) again after going back and forth for one circle in the resonant cavity, a first beam splitter (13) of the host (1) reflects a part of light to a first photoelectric detector (151), and the first photoelectric detector (151) converts the light into an analog electric signal and inputs the analog electric signal to the synchronizing device (152) through an ADC (analog-to-digital converter) device;

a marker detection module in the synchronization device (152) for detecting the received electrical signal in real time, recording the timing of the timing timer when a marker signal is detected, and starting a transmission timer; at the same time, the synchronization device (152) generates an information sequence to be transmitted, inputs the information sequence into the electro-optical modulator, and buffers the information sequence.

7. A resonant optical communication device based on echo cancellation according to claim 6, wherein: the synchronization device further comprises a timing comparison module for controlling the mark detection module to repeatedly perform its function when the transmission timer equals the timing of the timing timer.

8. A resonant optical communication device based on echo cancellation according to claim 2, wherein: the signal processing board (242) is used for demodulating the received information and recovering the original information so as to realize the receiving of the host signal.

9. A resonant optical communication device based on echo cancellation according to claim 1, wherein: the first photodetector (151) is a free space type detector.

10. A resonant optical communication device based on echo cancellation according to claim 1, wherein: the second photodetector (241) is a free space type detector.

Technical Field

The invention relates to the technical field of communication, in particular to a resonance optical communication device based on echo interference elimination.

Background

With the development of mobile communication technology from 1G to 5G, carrier frequencies used by wireless communication systems are higher and higher, and the carrier frequencies are developed from the original 150MHz to the present several tens of GHz, on one hand, because the spectrum resources of the low frequency band tend to saturate, and on the other hand, because the communication bandwidth provided by the low frequency band resources is limited, the requirement of people on bandwidth cannot be met. Therefore, in order to meet the demand of future communication development and realize high-speed broadband wireless communication, it is necessary to develop new spectrum resources to a high frequency band. Since the wavelength of light is short and has a frequency of several hundred THz, using light as a carrier of wireless communication will certainly become an important technical means for future wireless communication.

The trade-off between transmission rate and mobility is a difficult problem that must be solved in the development of wireless optical communication technology. Particularly, visible light wireless communication with an LED lamp as a light source has a large coverage area, a mobile terminal can move freely in the light coverage area without interrupting communication, and the mobile terminal has good mobility, but the modulation bandwidth of light is limited, which may cause a great limitation to the transmission rate of communication. Another type of wireless optical communication technology is directional laser communication using laser as a light source, which can achieve Gbps-level transmission rate, but needs complex mechanical devices to complete operations such as aiming, capturing, tracking, etc., and the mechanical devices have slow response speed, high cost, and great limitation on mobility.

The technology is a novel wireless optical communication technology, wherein the technology has high transmission rate and good mobility, and is a technology capable of breaking through the bottleneck of the development of the wireless optical communication technology.

Because the light beam reciprocates in the resonant cavity, the direct modulation of the signal on the light beam inevitably generates a very serious problem of echo interference in the cavity, namely, the light beam carrying the modulated signal reciprocates in the resonant cavity to influence the subsequent communication process. The existence of echo interference imposes a very serious constraint on the normal operation of communication, so that the advantages of the echo interference in terms of transmission rate and mobility cannot be fully demonstrated. Therefore, how to eliminate the echo interference is a problem that must be solved by developing the communication technology.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a resonance optical communication device based on echo interference elimination, which uses a timer to realize symbol synchronization so as to effectively eliminate echo interference.

The purpose of the invention is realized by the following technical scheme: a resonance optical communication device based on echo interference elimination comprises a host and a slave which form a distributed optical resonant cavity; the host comprises a first photoelectric detector, a synchronization device, a first return reflector, a first gain medium, a first beam splitter and an electro-optic modulator, wherein the first return reflector, the first gain medium, the first beam splitter and the electro-optic modulator are arranged on a light beam path; the slave machine comprises a second photoelectric detector, a signal processing board, a second retro-reflector, a second gain medium and a second beam splitter, wherein the second retro-reflector, the second gain medium and the second beam splitter are arranged on a light beam path;

the first recovery reflector is used for reflecting incident light according to the original incident direction; the second retro-reflector is used for reflecting incident light according to the original incident direction; the resonant cavity of the resonant optical communication device is positioned between the first retro-reflector and the second retro-reflector;

the first beam splitter is used for splitting the emergent light which is gained by the first gain medium to obtain a beam of transmitted light and a beam of reflected light, the reflected light obtained by splitting is transmitted to the first photoelectric detector, and the reflected light is subjected to photoelectric conversion by the first photoelectric detector and then is transmitted to the synchronizing device; transmitting the transmitted light obtained by beam splitting to an electro-optical modulator;

the synchronization device is used for generating a transmission signal and inputting the transmission signal to the electro-optical modulator, and controlling the generation time of the transmission signal so as to realize symbol synchronization of the signal transmitted in each period;

and the electro-optical modulator is used for modulating the transmitted light from the first optical beam splitter and the signal from the synchronization device and then transmitting the modulated light to the slave.

The second beam splitter is used for splitting the incident light received from the host to obtain a beam of transmitted light and a beam of reflected light; reflected light obtained by beam splitting is transmitted to a signal processing board through a second photoelectric detector; and transmitting the transmitted light obtained by beam splitting to a second retro-reflector through a second gain medium.

Further, the synchronizing device is an FPGA unit.

Further, an ADC module is disposed between the synchronization device and the first photodetector.

Furthermore, the synchronization device comprises an initial configuration module, and is used for generating an electric signal with small voltage as a marking signal when the master machine and the slave machine are communicated for the first time, so that the output light intensity of the electro-optical modulator is close to 0; when the synchronization means inputs the electric signal to the electro-optical modulator, a timer is started to count, and the clock of the timer is set to 20 times of the transmission rate.

Furthermore, the synchronization device further includes a mark detection module, when the output light reaches the host again after going back and forth for one circle in the resonant cavity, a first beam splitter of the host reflects a part of light to a first photodetector, and the first photodetector 151 converts the light into an analog electrical signal and inputs the analog electrical signal to the synchronization device through an ADC device;

the mark detection module in the synchronizer is used for detecting the received electric signals in real time, recording the timing of the timing timer when detecting a mark signal, and starting a sending timer; meanwhile, the synchronizer generates an information sequence to be sent, inputs the information sequence into the electro-optical modulator, and buffers the information sequence.

Further, the synchronization apparatus further includes a timing comparison module for controlling the mark detection module to repeatedly perform its function when the transmission timer is equal to the count time of the timing timer.

Furthermore, the signal processing board is used for demodulating the received information and recovering the original information so as to receive the host signal.

Further, the first photodetector is a free space type detector.

Further, the second photodetector is a free space type detector.

The invention has the beneficial effects that: the invention is improved on the basis of the distributed optical resonant cavity, and is combined with a synchronizer, and the symbol synchronization is realized by using a timer, so that the long-distance communication without intra-cavity interference can be realized between a system host and a slave, and the echo interference can be effectively eliminated; when the gain medium is in a working state, resonant light similar to laser can be spontaneously established between the host and the slave, and higher transmission rate can be realized; when the host computer and the slave computer move freely, the communication link is not interrupted, and the link can be quickly reestablished even if the interruption occurs, so that the mobile terminal has better mobility.

Drawings

FIG. 1 is a schematic diagram of the principles of the present invention;

in the figure, 1-master, 11-first retro-reflector, 12-first gain medium, 13-first beam splitter, 14-electro-optical modulator, 151-first photodetector, 152-synchronizer, 2-slave, 21-second beam splitter, 22-second gain medium, 23-second retro-reflector, 241-second photodetector, 242-signal processing board.

Detailed Description

The technical solutions of the present invention are further described in detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following.

As shown in fig. 1, a resonant optical communication device based on echo interference cancellation comprises a master 1 and a slave 2 forming a distributed optical resonant cavity; the host comprises a first photodetector 151, a synchronization device 152, and a first recovery reflector 11, a first gain medium 12, a first beam splitter 13, and an electro-optic modulator 14 disposed in the path of the optical beam; the slave machine 2 comprises a second photoelectric detector 241, a signal processing board 242, and a second retro-reflector 23, a second gain medium 22 and a second beam splitter 21 which are arranged on the light beam path;

the first recovery reflector 11 is configured to reflect incident light according to an original incident direction; the second retro-reflector 23 is configured to reflect incident light according to an original incident direction; the resonant cavity of the resonant optical communication device is located between the first retro-reflector 11 and the second retro-reflector 23;

specifically, the resonant cavity is composed of a retro-reflector in the master and the slave, and the retro-reflector has a characteristic of reflecting light back along the incident direction, so that the light beam in the cavity moves back and forth in the resonant cavity. The method comprises the steps of placing a gain medium, an electro-optic modulator and a beam splitter in a cavity, wherein the gain medium is mainly used for frequency selecting and amplifying light in a free space so as to enable the light to form a resonance state in the cavity; the electro-optical modulator is mainly used for modulating light, and electric signals are loaded on resonance light by changing the intensity of incident light so as to realize information transmission; the beam splitter is mainly used for dividing incident light into two parts, namely reflected light and transmitted light, and is respectively used for realizing different functions.

The first beam splitter 13 is configured to split the outgoing light that has been gained by the first gain medium 12 to obtain a beam of transmitted light and a beam of reflected light, and the reflected light obtained by splitting is transmitted to the first photodetector 151, and is subjected to photoelectric conversion by the first photodetector 151 and then transmitted to the synchronization device 152; the transmitted light obtained by the beam splitting is transmitted to the electro-optical modulator 14;

the synchronization device 152 is used for generating a transmission signal to be input to the electro-optical modulator 14 and controlling the generation time of the transmission signal so as to enable the signal transmitted in each period to realize symbol synchronization;

the electro-optical modulator 14 is configured to modulate the transmitted light from the first optical splitter 13 and the signal from the synchronization device, and transmit the modulated light to the slave 2.

In the embodiment of the present application, the first retro-reflector 11, the first gain medium 12, the first beam splitter 13, the electro-optic modulator 14, the second beam splitter 21, the second gain medium 22, and the second retro-reflector 23 are sequentially arranged from left to right, and centers of the first retro-reflector 11, the first gain medium 12, the first beam splitter 13, the electro-optic modulator 14, the second beam splitter 21, the second gain medium 22, and the second retro-reflector 23 are located on the same horizontal straight line;

the second beam splitter 21 is configured to split the incident light received from the host 1 to obtain a beam of transmitted light and a beam of reflected light; reflected light obtained by beam splitting is transmitted to the signal processing board 242 through the second photodetector 241; the split transmitted light is transmitted via the second gain medium 22 to the second retro-reflector 23.

In the embodiment of the present application, the synchronization device 152 is an FPGA unit. An ADC module is disposed between the synchronization device 152 and the first photodetector 151.

In the embodiment of the present application, the synchronization device 152 includes an initial configuration module, which is configured to generate an electrical signal with a very small voltage as a marking signal when the master 1 and the slave 2 communicate for the first time, and in the embodiment of the present application, the marking signal is generally 0.01V to 0.05V; the output light intensity of the electro-optical modulator 14 is made close to 0; a timing timer is started to count while the synchronization means 152 inputs the electrical signal to the electro-optical modulator, and the clock of the timer is set to 20 times the transmission rate.

The synchronization device further comprises a mark detection module, when the output light reaches the host 1 again after going back and forth for one circle in the resonant cavity, the first beam splitter 13 of the host 1 reflects a part of light to the first photodetector 151, and the first photodetector 151 converts the light into an analog electric signal and inputs the analog electric signal to the synchronization device 152 through an ADC device;

a mark detection module in the synchronization device 152, configured to detect the received electrical signal in real time, record timing of the timing timer when a mark signal is detected, and start a sending timer; at the same time, the synchronizer 152 generates an information sequence to be transmitted, inputs the information sequence into the electro-optic modulator, and buffers the information sequence.

The synchronization device further comprises a timing comparison module for controlling the mark detection module to repeatedly perform its function when the transmission timer equals the timing of the timing timer.

In the embodiment of the present application, the signal processing board 242 is configured to demodulate the received information, and recover the original information, so as to implement receiving the host signal. The first photodetector 151 is a free space type detector. The second photodetector 241 is a free space type detector.

In this embodiment, the optical resonator is composed of two optical mirrors and a gain medium therebetween, photons are reflected by the two mirrors to continuously travel back and forth to generate oscillation, and the photons continuously meet excited particles during operation to generate excited radiation, so that stable laser is finally formed and output to the outside of the cavity.

In the embodiment of the application, the components of the distributed optical resonance system are divided into two parts, namely a resonance optical transmitter and a resonance optical receiver. It should be noted that, when the incident light enters the retro-reflector, it will be reflected back along the incident direction, so that the resonant optical receiver can maintain the optical path stable even under the condition of free movement, and this characteristic makes the system have good mobility. Therefore, under the structure, the light beam in the cavity can continuously reflect and reciprocate between the transmitter and the receiver, and the gain medium can compensate the power loss generated in the reciprocating motion so as to ensure that the light beam in the cavity maintains a stable state.

If the light beam is blocked by an object in the process of propagation, the light beam cannot be reflected back along the original incident direction, so that the resonance state cannot be stabilized, the connection is interrupted, and the system has good safety due to the characteristic.

The communication device comprises two devices, namely a master machine 1 and a slave machine 2, wherein a first retro-reflector 11 and a first gain medium 12 in the master machine 1 and a second retro-reflector 23 and a second gain medium 22 in the slave machine 2 form a distributed optical resonant cavity, so that light can be ensured to run back and forth between the slave machine 1 and the master machine 2 to form stable resonant light. In order to realize the communication between the master 1 and the slave 2, an electro-optical modulator 14 is arranged on the light beam path of the master 1, information to be transmitted is loaded on the intracavity light beam, and partial intracavity light beam is introduced into the signal processing board from the slave through a first beam splitter 13, so that the transmitted information is recovered.

In an embodiment of the present invention, the first beam splitter 13 is configured to split the reflected light into a first beam reflected light and a second beam transmitted light according to a predetermined ratio, and to introduce the first beam reflected light into the first photodetector.

It should be noted that the first beam splitter 13 can split the intra-cavity beam into two parts: the transmitted light and the reflected light, and the power of each separated light beam accounts for a certain proportion of the power of the original input light beam. The reflected light is sent to the signal processing board to complete the synchronous work, and the transmitted light makes reciprocating motion in the cavity to maintain the stability of the light beam in the cavity.

Light involved in the present invention includes infrared light, ultraviolet light, visible light, and the like. The retro-reflector is replaced by a device having retro-emission on light of a corresponding wave band, the electro-optic modulator, the photoelectric detector, the beam splitter and other optical devices are replaced by the electro-optic modulator, the photoelectric detector, the beam splitter and other optical devices of the corresponding wave band, and the gain medium is replaced by a gain medium having a gain function on the light of the corresponding wave band.

The resonance optical communication device based on the synchronous module and the channel estimation and without the intra-cavity interference adopts the distributed optical resonant cavity similar to the optical resonant cavity in the traditional laser communication, so that the intra-cavity light beam of the device has high power density and can realize higher transmission rate. Because the retro-reflector can enable incident light to be reflected back along the incident direction, the device can communicate in a state that the slave is free to move, and has good mobility. Due to the physical principle of the intracavity light beam system, when foreign matters block the light beam from propagating, the connection can be immediately interrupted, and the safety is better.

The structure of the invention relates to the field of resonance optical communication, but is different from the prior art in that the structure of the invention is used for eliminating echo interference in a cavity, realizing high transmission rate and adding a signal processing module containing a synchronous circuit to realize echo interference elimination. In addition, a feasible modulation and demodulation scheme is described to meet the needs of future communication developments.

The foregoing is only a partial embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.