374 results about "Bidirectional transmission" patented technology

The invention relates to the technical field of computational mechanics and geological disaster simulation, and discloses a full-process numerical simulation method suitable for simulating continuous medium damage to discontinuous medium movement. The invention provides a novel chain-type disaster simulation method for solving the problems that calculation efficiency and large deformation precision are difficult to consider at the same time and the evolution process of a slope from a continuum to a fragmented body cannot be dynamically reflected in the prior art. The core of the method is that a dynamic criterion is set based on a unit real-time damage variable, a failed finite element (FEM) unit is adaptively converted into smoothed particle hydrodynamics (SPH) particles, and the physical state of the particles is accurately mapped; and a virtual particle coupling algorithm is adopted to process a two-domain interface, so that bidirectional transmission of mechanical parameters is realized. The method is executed circularly, the whole process of'continuous deformation-fragmentation flow 'of the side slope is simulated dynamically, high-precision integrated simulation of a'seismic source-propagation-response-movement' disaster chain in the same frame is achieved, and an efficient tool is provided for disaster risk assessment and prevention and control.

The invention provides an emergency broadcast playing method and system for disasters in an outdoor scene, and relates to the technical field of emergency broadcasts, cameras in a region are adopted to monitor the evacuation state of personnel in the outdoor scene in real time, and an emergency broadcast system and a rescue system are triggered through the evacuation state to perform linkage, so that bidirectional information transmission is realized; and the priority of the broadcast content played by the emergency broadcast is adjusted according to different instruction information in bidirectional information transmission, so that the broadcast content has pertinence, and rescue workers can receive key instructions.

A power converter, includes: a first terminal, a second terminal, a third terminal and a fourth terminal; stored-energy-source terminals, to which a stored energy source can be connected; four inverter bridge branches, which are formed from semiconductor switching devices, the inverter bridge branches each having a center tap, each center tap being assigned to one of the terminals, and the inverter bridge branches being interconnected and controllable such that electrical energy can be transferred bidirectionally between the stored-energy-source terminals and the first terminal, the second terminal, the third terminal and / or the fourth terminal; and a control unit, which is designed to control the semiconductor switching devices of the inverter bridge branches.

The invention discloses an aircraft remote control delay compensation response method and system, and the method comprises the steps: obtaining airborne data, and constructing a multi-source data set; calculating bidirectional transmission delay based on a bidirectional delay estimation algorithm, and calculating initial total delay; the initial total delay is dynamically calibrated by using a self-adaptive delay calibration algorithm, the confidence coefficient is evaluated, and the delay precision is improved; deducing a flight state in a delay time period by adopting a delay deduction hybrid model, and dynamically adjusting parameters along with load; according to the deduction result and the original instruction, generating a compensation instruction containing constraints by using a model prediction control algorithm; and executing the instruction after onboard verification, comparing the actual state with the expected state, and feeding back a deviation value to optimize the weight of the next-round model so as to form a closed-loop lifting mechanism. According to the method, the problems of incomplete delay composition analysis, poor environmental adaptability, lack of constraint collaboration of compensation instructions, no closed-loop optimization mechanism and the like in the existing aircraft remote control delay compensation are solved.

The invention provides an atypical MOPA fiber laser device integration device, system and method. The device comprises an optical resonant cavity, a first device group and a second device group, wherein the first device group comprises a first amplification stage gain optical fiber, a first reverse pumping beam combiner, a first pumping source and a first cladding light stripper, and the second device group comprises a second amplification stage gain optical fiber, a second reverse pumping beam combiner, a second pumping source and a second cladding light stripper; the optical resonant cavity is used for receiving the pump light transmitted by the first amplification stage gain optical fiber and the second amplification stage gain optical fiber, transmitting the pump light which is not absorbed to the second amplification stage gain optical fiber and the first amplification stage gain optical fiber, and generating signal light under the action of the absorbed pump light; and the signal light is transmitted to the first amplification stage gain fiber and the second amplification stage gain fiber in positive and negative directions. The device number and the manufacturing cost are remarkably reduced, the light-to-light conversion efficiency and the system reliability are improved, and meanwhile high-power beam combination and miniaturization integration are facilitated.

The invention provides a communication delay detection and control method for ship remote control, and the method comprises the steps: embedding a high-precision timestamp in a control instruction and a data packet through a shipborne 4G / 5G dual-mode communication module and a shore-based monitoring center, and transmitting the high-precision timestamp; two-way transmission delay of the ship-shore communication link is measured based on the embedded timestamp, and the packet loss rate in a preset time window is counted; on the basis of historical delay data, a dynamic moving average method is combined with an adaptive Kalman filtering algorithm to predict a delay change trend in a future short period; judging the current communication state according to the bidirectional transmission delay, the packet loss rate and the predicted delay change trend; a sending strategy of the control instruction is adaptively adjusted according to the judgment result, or the ship-borne local intelligent controller is switched to execute autonomous risk avoiding control; an improved clock synchronization protocol is adopted regularly to calibrate a ship-shore clock, and timestamp synchronization precision is ensured. Through the synergistic effect of ship-shore clock synchronization optimization, instruction verification sequencing and other modules.

The invention relates to the field of data transmission, and provides a time series data cross-gatekeeper two-way transmission method, device and equipment, and the method comprises the steps: configuring an Internet of Things database cluster and an isolation gatekeeper, and determining a configuration result; according to the configuration result, the sending end is started to package the time sequence data, a data packet containing redundancy check information is generated, and the redundancy check information comprises a double-length field and a check code; transmitting the packaged data packet to a receiving end through an isolation gatekeeper; after the receiving end receives the data packet, verifying the dual-length field and the check code, if the verification is passed, returning a success signal, otherwise, returning a failure signal; and if the sending end receives the failure signal, automatically retransmitting the data packet until a successful signal is received or a preset retry condition is met. The problem that in the prior art, cross-gatekeeper time sequence data transmission cannot meet the requirements for high safety and real-time performance at the same time is solved, and safe and reliable time sequence data two-way real-time transmission under the strict network isolation condition is achieved.

The invention provides an intelligent control method and system for a body-equipped robot based on man-machine interaction data, and relates to the technical field of medical robots, and the method comprises the steps: building a 5G network two-way transmission channel between a control end and a surgical robot end; through a 5G network two-way transmission channel, synchronously transmitting two types of data streams between the control end and the surgical robot end, namely a control instruction data stream generated by the control end and a surgical image data stream collected by the surgical robot end; in the transmission process of the two types of data streams, real-time network time delay is continuously monitored, whether the current network time delay exceeds a preset time delay threshold value or not is judged, and the preset time delay threshold value can be dynamically corrected according to the network state; and when it is judged that the current network delay exceeds the preset delay threshold, dynamically deploying a plurality of network probes on the 5G network two-way transmission channel. According to the invention, the real-time performance, the accuracy and the safety of the remote operation can be ensured.

The invention relates to the technical field of non-cutting machining of metal plates, in particular to a bending integrated forming device and method for aluminum veneers, and the bending integrated forming device for the aluminum veneers comprises a workbench, a portal frame, bending modules with adjustable intervals, a bending structure, a rotating structure and an adsorption structure. The bending structure comprises a trapezoidal bending plate, a second bending plate and a first bending plate, and three-stage bending is achieved through synchronous movement driven by a bidirectional transmission mechanism. The rotating structure comprises a hollow rotating disc and a one-way bearing and is used for turning the plate by 90 degrees. The adsorption structure fixes a plate through a vacuum generation device; the forming method comprises the steps of plate placing and positioning, bending module pressing, negative pressure adsorption, multi-stage bending execution, module splitting and resetting, steering control and remaining edge bending. According to the scheme, multi-direction integrated bending of the aluminum veneer can be efficiently completed, grooving is avoided, and the product precision and strength are improved.

An arrangement is for increasing the range of an electrically driven vehicle combination. The arrangement includes a power adaptation and charging control unit for bidirectionally transmitting voltage between a first high-voltage battery of a towing vehicle of the vehicle combination and a second high-voltage battery of a trailer of the vehicle combination.

A bidirectional power supply apparatus includes: an alternating current input port for inputting an alternating current to the bidirectional power supply apparatus; an alternating current output port for outputting the alternating current to an alternating current device; a direct current input or output port for transmitting a direct current between the bidirectional power supply apparatus and a direct current device bidirectionally; a bidirectional energy conversion module for performing multiple energy conversions on electrical energy inputted to the bidirectional power supply apparatus; and a power management module electrically connected to the alternating current input port, the alternating current output port, and the direct current input or output port. The power management module is configured to control an energy conversion manner of the bidirectional energy conversion module according to a port connection status of the alternating current input port, the alternating current output port, or the direct current input or output port.

The invention relates to a series connection type balance control system, method and device between parallel battery clusters, the system comprises n battery branches which are connected in parallel, and each battery branch comprises a battery cluster, a positive adjusting element, a negative adjusting element, a positive bypass switch and a negative bypass switch, an energy two-way transmission unit is connected in series between one positive pole bypass switch and the other negative pole bypass switch in two adjacent positive pole bypass switches; and an energy two-way transmission unit is also connected in series between the nth positive pole bypass switch and the first negative pole bypass switch. The system makes up the electric quantity difference between the battery clusters through the mutual cooperation of the energy storage element group connected in series with the negative electrodes of the battery clusters and the bypass switch group connected in parallel with the energy storage element group, forms an SOC equalization path, does not involve a high-voltage direct-current bus, only uses a low-voltage energy bidirectional transmission unit, is low in power and low in cost, and improves the reliability of the system. The input and output of the equalization control energy two-way transmission unit can be freely set, and equalization control can be carried out between any two battery clusters.

The invention provides a portrait animation generation method and system based on a reversible encoder and dynamic optimization, and relates to the technical field of video portrait reconstruction, high-precision portrait animation generation is realized through multi-module collaborative innovation, multi-scale appearance features are extracted by using a VAE encoder, identity vectors extracted by ArcFace and global appearance embedding of CLIP are combined, and the portrait animation generation method and system based on the reversible encoder and dynamic optimization are realized. Constructing a multi-modal characteristic system; a high-precision attitude estimation algorithm is adopted to extract fine joint points, and an error between a generated attitude and an original attitude is calibrated in real time through a dynamic optimization strategy, so that the attitude driving accuracy is remarkably improved. A reversible residual block is designed to realize lossless two-way transmission of features, and the problem of information compression of a traditional encoder is avoided; a high-frequency detail injection mechanism is introduced, high-frequency features such as facial textures are extracted through a pre-training model and fused with shallow features, an attention mechanism guided by identity features is introduced based on the generation process of a diffusion model, and the consistency of character identities in the generation process is ensured.

The invention discloses a lithium battery electrothermal coupling SOC estimation method based on capacity dynamic correction. The method comprises the following steps: firstly, collecting current, voltage, surface temperature and environment temperature data under wide-temperature and multi-rate working conditions; then, an electrothermal coupling frame composed of a second-order RC electrical model and a lumped parameter two-state thermal model is constructed, and bidirectional transmission of electrical-thermal parameters is achieved; coupling parameters are identified on line by using a variable forgetting factor recursive least square method, temperature-multiplying power-capacity binary high-order polynomial dynamic mapping is constructed, and available capacity is corrected in real time; and finally, the correction capacity is taken as a reference, SOC is estimated through H infinity-AUKF joint, and non-Gaussian noise is suppressed. The corresponding system comprises a data acquisition module, a model construction module and the like, can be integrated in a BMS (Battery Management System), realizes SOC high-precision estimation under wide temperature and multiple rates, is suitable for an electric vehicle and an energy storage system, and has the advantages of capacity dynamic correction, electric heating bidirectional coupling, wireless parameter identification and high robustness of non-Gaussian noise.

The utility model provides a radioactive rabbit bidirectional pneumatic transmission system which comprises a first receiving and transmitting device, a second receiving and transmitting device, a transmission pipe, a sample box and an air supply mechanism, the transmission pipe comprises two sections of pipelines made of conductive materials and a section of pipeline made of insulating materials, and a magnet is arranged on the sample box. Through the arrangement of the gas supply device, the first receiving and transmitting device and the second receiving and transmitting device, two-way transmission of the sample box between the first receiving and transmitting device and the second receiving and transmitting device can be achieved in the using process, operation is easy and convenient, manual sample transportation is not needed, and harm of radiation to workers is greatly reduced; the hemispherical first air bags installed at the two ends of the sample box can guide the sample box when the sample box passes through the turning part in the conveying pipe, the sample box is prevented from being clamped at the turning part of the conveying pipe, meanwhile, the hemispherical first air bags can buffer the sample box when the sample box turns, and the impact force of the sample box on the inner wall of the conveying pipe is reduced.

The invention belongs to the field of acoustic particle control and surface acoustic wave devices, and aims to solve the problems of low efficiency, low precision and difficulty in realizing a complex space structure in traditional biological assembly. The invention provides an integrated programmable surface acoustic wave particle patterning control system. A first surface of a piezoelectric substrate is provided with an interdigital transducer area, a control area and other areas; the interdigital transducer is used for realizing two-way transmission of an electric signal and a sound signal through a piezoelectric effect so as to regulate and control a sound field pattern in real time; the upper computer is used for providing waveform data and a driving instruction required by the surface acoustic wave signal source board card, and the surface acoustic wave signal source board card generates resonant frequency required by the surface acoustic wave transducer based on the waveform data and the driving instruction so as to excite the surface acoustic wave device to perform particle control. The invention provides a new technical path for miniaturization, high efficiency and precision of biological assembly.

The invention discloses an RTMP one-way proxy method, system and device based on one-way import equipment and a medium, mainly relates to the technical field of one-way proxy, and is used for solving the problems that in the existing scheme, the one-way flow of data is strictly limited, but a VPN (Virtual Private Network) needs to establish a tunnel through two-way communication, and the handshake process of an RTMP also depends on two-way transmission, so that the efficiency is high. The defect cannot be avoided in the prior art. Comprising a streaming media service relay module connected with RTMP stream pushing end equipment A, a one-way sending program connected with the streaming media service relay module, a one-way receiving program connected with the one-way sending program, and an analog terminal publishing module connected with the one-way receiving program. The system comprises a subscribed external network RTMP streaming media server, an analog terminal subscription module connected with the subscribed external network RTMP streaming media server, a one-way sending program connected with the analog terminal subscription module, a one-way receiving program connected with the one-way sending program, and an analog terminal publishing module connected with the one-way receiving program.

The application relates to a bidirectional output L2C3 resonant converter, which comprises two excitation sources and a resonant cavity, wherein the excitation sources are both half-wave bridge circuits; the resonant cavity comprises a transformer, three capacitors and two inductors; the primary winding of the transformer is connected in parallel with a resonant capacitor C p 1; the same end of the primary winding of the transformer is connected with a resonant capacitor C1 and an inductor L1 in series connection; the other end of the inductor L1 is connected with the connection point of the first excitation source and two switch tubes in series connection; the same end of the secondary winding of the transformer is connected with a resonant capacitor C2; the other end of the resonant capacitor C2 is connected with the connection point of the second excitation source and two switch tubes in series connection; the leakage inductor L g of the secondary winding of the transformer is used as a resonant inductor; the other ends of the same ends of the primary and secondary windings of the transformer are respectively connected with the negative poles of the direct-current power supplies of the corresponding excitation sources. Energy bidirectional transmission and synchronous rectification are realized through a brand-new circuit topology. All active switches can realize soft switching, and the working efficiency is improved. In an open-loop control state, the output current does not change with the change of a load, and the application is suitable for a bidirectional constant current working mode.

Provided is a gateway device provided between a control device that controls at least one first user terminal that performs single-core bidirectional transmission and at least one second user terminal that performs two-core transmission. The gateway device comprises: a plurality of main signal control signal multiplexing / demultiplexing units that demultiplex an input optical signal into at least main signal light and control signal light; and a plurality of control signal transceivers that transmit and receive control signal light between the at least one user terminal and the at least one second user terminal via at least one of the plurality of main signal control signal multiplexing / demultiplexing units. Each of the plurality of control signal transceivers includes an output unit that outputs uplink control signal light transmitted from the at least one first user terminal or the at least one second user terminal to an optical reception unit.　

The invention discloses an ancient masonry bridge floater impact analysis method based on fluid-solid coupling, which comprises the following steps of: firstly, creating and correcting a finite element model of a bridge structure by combining three-dimensional scanning and field vibration test; secondly, according to the water flow monitoring data, a matched fluid domain model is created, and the motion characteristics and boundary conditions of fluid are determined; then, a bidirectional information exchange mechanism between the structure and the fluid is established, and bidirectional transmission of key parameters such as load and displacement under the fluid-solid coupling effect is achieved; and finally, setting the size and material parameters of the floating object, executing the whole process simulation of the floating object impacting the ancient masonry bridge, obtaining the core data of the bridge structure, and completing the impact influence analysis. The evaluation method has the advantages of being complete in process, accurate in modeling and rich in result, the influence of floating object impact on the ancient masonry bridge can be effectively quantified, the blank of floating object impact analysis of the ancient masonry bridge is filled up, and a scientific basis is provided for preventive protection of bridge heritage.

In open-pit mines and underground mine tunnels, this system accurately tracks the position of mining vehicles such as heavy machinery and support vehicles, as well as their relative positions, enabling safe control of mining vehicles. [Solution] The system comprises a plurality of first devices 1 installed in or around a mine pit P or tunnel T, capable of acquiring their own position information, and a plurality of second devices 2 installed on multiple mining vehicles brought into the mining site. The system includes distance calculation means for calculating the distance between each of the plurality of first devices 1 and the second device 2 based on the bidirectional transmission and reception times of information or signals between each of the plurality of first devices 1 and the second device 2, and position identification means for identifying the position of the second device 2 based on the distance between each of the plurality of first devices 1 and the second device 2 calculated by the distance calculation means, and the position information of each of the first devices 1.

The present application relates to the field of sewage treatment, and more particularly to an AOA sewage treatment intelligent control system based on digital twinning. It comprises a physical perception layer, a data transmission layer, a digital twinning layer, an intelligent control layer and an execution layer. The physical perception layer collects AOA process physical data throughout the whole process and preprocesses them into standardized data; the data transmission layer realizes the bidirectional transmission of data and control instructions between each level; the digital twinning layer, based on the denitrification and phosphorus removal microbial metabolism mechanism of the AOA process, constructs a whole-process twinning model synchronized with the physical system in real time and generates simulation prediction data; the intelligent control layer generates control instructions according to the data; the execution layer executes the instructions and collects feedback data, which is used to update the twinning model and correct the control instructions. Through the five-layer series closed-loop structure, the present application realizes the intercommunication of data, the interaction of instructions and the closed-loop feedback of each level, and constructs a whole-process closed-loop intelligent control system of "perception-transmission-twinning-decision-execution".

The invention discloses a bullet hole positioning target picking system based on a WiFi local area network and camera visual recognition, and relates to the technical field of shooting training auxiliary equipment. Comprising a visual acquisition module, a WiFi communication module, a main control module, a target picking execution module and a power supply module, the visual acquisition module acquires a target sheet image through a high-definition camera, and optimizes the image quality in combination with a light sensing unit and an image preprocessing unit; the WiFi communication module constructs a wireless local area network to realize two-way transmission of image data and control instructions among the modules; the main control module completes accurate bullet hole positioning through image recognition and positioning calculation and generates a target picking control instruction; the target picking execution module completes target paper clamping, recycling and replacing based on the control instruction, and closed-loop control is achieved through position detection. The bullet hole positioning precision is improved through self-adaptive image preprocessing and target sheet position correction, bullet hole positioning and target picking full automation are achieved, and the method can be widely applied to scenes such as shooting training and competitions.

The invention provides a clearance-adjustable worm and gear type speed reducer. The clearance-adjustable worm and gear type speed reducer comprises a box body, the worm wheel assembly comprises a worm wheel, an output shaft coaxially fixed with the worm wheel, and a first bearing seat and a second bearing seat which are respectively arranged on two sides of the worm wheel and support two ends of the output shaft; the worm gear assembly is detachably installed on the box body through the first bearing seat and the second bearing seat, and a whole is formed after installation. The worm is rotatably supported on the box body through a bearing assembly and is meshed with the worm gear; the first adjusting mechanism is arranged between the first bearing seat and / or the second bearing seat and the box body, and is used for driving the worm gear assembly as a whole to perform position fine adjustment relative to the box body in the radial direction of the output shaft; and the second adjusting mechanism is arranged on the box body, is connected with one end of the worm and is used for independently adjusting the axial mounting position of the worm. After being installed, the worm gear assembly serves as a whole to be subjected to radial fine adjustment and cooperates with worm axial adjustment, and therefore the bidirectional transmission gap is compensated conveniently and accurately.

The invention discloses an automatic screen printing machine with double operating systems, comprising: a frame comprising a bottom frame and a vertical frame arranged on the bottom frame, the bottom frame being provided with a first station and a second station respectively at two ends of the vertical frame; the first screen printing mechanism is arranged on one side of the vertical frame, located at the upper end of the first station and used for conducting screen printing machining on products on the first station. The second screen printing mechanism is arranged on the other side of the vertical frame, located at the upper end of the second station and used for conducting screen printing machining on the products on the second station; and the two-way conveying mechanism is arranged on the bottom frame and can convey the products to the second station from the first station or convey the products to the first station from the second station. The first silk-screen mechanism and the second silk-screen mechanism are arranged at the two ends of the vertical frame correspondingly, the two silk-screen mechanisms can operate independently or operate in a matched mode, and therefore independent silk-screen work or double-silk-screen matched work can be achieved, the silk-screen work efficiency is greatly improved, and the occupied space is greatly saved.

This application discloses a fiber optic fluorescence level sensor based on evanescent waves, relating to the field of fiber optic sensing. The sensor includes: a light source module that outputs excitation light, which is sent to a fiber optic sensing unit to generate a fluorescence signal; a transmission fiber responsible for bidirectional signal transmission; a fiber optic sensing unit comprising a fiber optic strip D-groove structure, an encapsulation structure, a sensitive material, and a floating piston. The piston divides the encapsulation structure into two sections: the lower section contains the liquid to be measured, and the upper section integrates the sensitive material and the fiber optic strip D-groove structure. The piston floats synchronously with the liquid surface, changing the effective contact area between the sensitive material and the fiber optic strip D-groove structure, causing a regular change in the fluorescence intensity excited by the evanescent wave; a fiber optic spectrometer to acquire wavelength-intensity spectral information; and a computer module to perform data visualization, achieving real-time liquid level monitoring based on changes in fluorescence intensity. This sensor can improve upon the problems of existing fiber optic level sensors, such as complex fabrication, high cost, limited range, high equipment requirements, and poor adaptability to harsh environments.

The invention discloses a charging system of a new energy locomotive. The charging system comprises a power grid side data acquisition module, a cable state acquisition module, a battery side data acquisition module, a cable dynamic impedance calculation unit, a polarization voltage correction unit, a closed-loop power control unit and a three-terminal data interaction bus. Each acquisition module establishes a two-way transmission link with the calculation unit, the correction unit and the control unit through a bus, and generates a charging control instruction through coupling operation and correction operation; according to the system, the problem that multi-dimensional state coupling is not considered in the prior art is solved, accurate control over the charging process is achieved, and the charging stability and safety are guaranteed.

This disclosure relates to a multimedia resource push method, apparatus, electronic device, storage medium, and product. The method includes: obtaining a target association graph; obtaining initial object category indicators for multiple preset objects; based on the initial object category indicator data, performing bidirectional transmission of indicator data between nodes with preset association edges to obtain target object category indicator data for multiple preset objects and target interest indicator data for historical multimedia resources; filtering the first object set based on the target object category indicator data of preset objects in the first object set to obtain target objects; determining associated multimedia resources of the first object category in historical multimedia resources based on the target interest indicator data; and pushing associated multimedia resources to the target objects. Using embodiments of this disclosure, objects with abnormal interests in the preset object set can be filtered out in a timely manner, and the multimedia resources preferred by each type of object can be accurately identified, thus improving the efficiency of multimedia resource push.

The application provides a split locking bidirectional transmission device and method for an intermediate adding and removing rod drilling machine in a coal mine underground, which comprises a power shaft and a transmission shaft connected in sequence, and a locker is sleeved outside the power shaft and the transmission shaft; the locker comprises a locking seat, the locking seat comprises a hollow locking shaft, two or more than two positioning cavities are arranged on the locking shaft in a radial direction and are arranged at equal intervals in a circumferential direction, and a positioning ball is installed in each positioning cavity; the power shaft comprises a hollow power shaft body, and an arc-shaped positioning groove is arranged on the outer surface of the power shaft body; when the power shaft body of the power shaft is sleeved in the locking shaft to a state where the positioning cavities are radially aligned with the arc-shaped positioning groove, the radially inner side of the positioning ball can enter the arc-shaped positioning groove to realize locking. The split structure, threaded quick disassembly, axial locking anti-loosening, component part replacement and other technical means are adopted, bidirectional power transmission is realized, the service life of the transmission device is improved, the disassembly and replacement efficiency is improved, and the comprehensive use cost is reduced.

To provide an optical transmission device, an optical transmission system, and an optical transmission method that suppress an OSNR penalty due to return light.SOLUTION: An optical transmission device disposed at a fiber end of a single-core optical fiber and used when signal light is bidirectionally transmitted through the optical fiber, the optical transmission device comprising an optical transmitter configured to transmit first signal light in one direction belonging to the signal light, an optical receiver configured to receive second signal light in a reverse direction belonging to the signal light, and a controller configured to guide the first signal light transmitted from the optical transmitter to the optical fiber, An optical circulator configured to guide the second signal light from the optical fiber to the optical receiver; and a light source configured to output, to the optical fiber, excitation light that Raman-amplifies the second signal light to second optical power higher than first optical power of the first signal light.SELECTED DRAWING: Figure 2