87 results about "Space division multiplexing" patented technology

The invention discloses a distributed optical fiber two-dimensional vector sensing system and method, the system uses an acousto-optic modulator group and an optical circulator group to ask a plurality of fiber cores of a multi-core optical fiber in parallel, heterodyne coherent detection uses local oscillator light to improve the signal-to-noise ratio, and through the relation between the fiber core position difference and the direction angle of a two-dimensional sound wave in the aspect of algorithm, the two-dimensional sound wave direction angle is obtained. According to the space division multiplexing distributed optical fiber acoustic sensing system, a two-dimensional vector signal is accurately restored, the measurement vector angle range of the space division multiplexing distributed optical fiber acoustic sensing system for two-dimensional sound waves is 0-360 degrees, the vector sensing range is larger than 50 km and far exceeds that of an existing system, and the detection capacity of the distributed optical fiber acoustic sensing system is greatly improved.

The invention relates to a virtual network mapping method based on double-agent reinforcement learning in a space division multiplexing elastic optical network, belongs to the technical field of communication, and aims to solve the problems of multidimensional resource allocation complexity, fiber core crosstalk and spectrum fragmentation in the space division multiplexing elastic optical network. According to the technical scheme, collaborative optimization mapping is carried out on virtual network requests by setting a link fiber core mapping agent and a frequency spectrum mapping agent, and the collaborative optimization mapping comprises the steps of initializing an underlying optical network topology and a virtual network topology, sorting virtual network sets according to the total bandwidth of the requests, embedding virtual links in a descending order, and executing physical node embedding and path searching. And the intelligent agent selects a link fiber core and spectrum allocation based on the network state feature matrix, and a model is trained through a reward mechanism to realize efficient resource matching. The technical effects are that the real-time performance and efficiency of virtual network mapping are obviously improved, the service blocking rate is reduced, the spectrum resource utilization rate is optimized, and the overall load capacity of the network is enhanced.

Embodiments of the present application provide a method and device for initial access. The method introduces space division multiplexing SSB, and simultaneously transmits multiple SSB beams on the same time-frequency resource, thereby reducing the time domain overhead of SSB while not reducing the resolution of SSB beams.

The invention provides a manufacturing method of a hollow-core optical fiber preform with a special-shaped structure, and belongs to the technical field of manufacturing of optical fiber preforms. The method comprises the following steps: firstly, providing at least two hollow glass tubes; cutting each hollow glass tube along the axial direction of the hollow glass tube to form a C-shaped section tube with an opening; then, at least two C-shaped section pipes are in butt joint at the openings of the C-shaped section pipes, and a pre-assembly body with a special-shaped section structure is formed through combination; and finally, laser beams are adopted for welding along seams at the butt joint positions of the C-shaped section pipes, so that the C-shaped section pipes are combined into a whole, and the hollow-core optical fiber preform with the special-shaped structure is formed. Through modularized C-shaped pipe butt joint and laser welding, the problem that a complex special-shaped hollow core structure is difficult to manufacture through a traditional method is solved, high-precision forming and stable inheritance of the special-shaped structure are achieved, and a reliable manufacturing basis is provided for space division multiplexing and other frontier optical applications.

Embodiments of the present disclosure relate to a solution for a reader determination for a backscattering transmission. In one aspect, based on a geometric relation between a third device, an activator and at least one second device associated with the third device, a first device determines a second device as a reader for the third device. The first device then transmits a first indication for receiving a backscatter transmission of the third device to the determined second device, and the backscatter transmission is based on an activation signal of the activator. In this way, the original activation signal may be isolated from the backscattering signal through space division multiplexing. Therefore, interference between the activation signal and the backscattering transmission can be minimized, the SIR can be maximized as much as possible.

The wavelength division multiplexer for space division multiplexing may comprise a wavelength division multiplexing fan-out device or a pump signal combiner for multicore fibers.

The utility model discloses an annular multi-user quantum key distribution system based on space division multiplexing. The annular multi-user quantum key distribution system comprises a Charlie relay end, a plurality of user ends and an annular quantum channel, the Charlie relay end and the plurality of user ends are respectively accessed to the annular quantum channel; the Charlie relay end comprises a multi-wavelength pulse generation module, a fan-in module, a first beam splitter, a first fan-out module and a detection module. The utility model discloses an annular multi-user quantum key distribution system based on space division multiplexing, which is characterized in that a multi-wavelength pulse generation module emits pulses with multiple wavelengths, the pulses are coupled to a specified fiber core of a multi-core optical fiber through a fan-in module, and then the pulses reach specified user sides through an annular quantum channel; spatial division multiplexing is utilized to realize simultaneous communication of a plurality of user sides, so that the communication capacity is expanded, and the non-linear effect in the optical fiber is prevented from being increased. And meanwhile, a Sagnac ring structure is adopted, so that the phase stability is very good.

A first UE transmits, on a first unicast link to a second UE, a first RS from a first TRP of the first UE. The first UE receives, based on the first RS transmitted, a first channel measurement for the first unicast link from the second UE and a first interference measurement for a second unicast link from a third UE. The first UE transmits, on the second unicast link with the third UE, a second RS from a second TRP of the first UE. The first UE receives, based on the second RS transmitted, a second channel measurement for the second unicast link from the third UE and a second interference measurement for the first unicast link from the second UE. The first UE applies SDM for the first unicast link and the second unicast link based on the received channel and interference measurements.

A kind of distributed multi-parameter sensing system based on multi-core optical fiber, including laser, laser light source is sent to the signal generator input trigger pulse drive respectively with the signal input end of phase-sensitive optical time domain reflectometer based on Rayleigh scattering and its demodulation device, Raman optical time domain reflectometer based on Raman scattering and its demodulation device, Brillouin optical time domain reflectometer based on Brillouin scattering and its demodulation device are connected, the signal output end of phase-sensitive optical time domain reflectometer and its demodulation device, Raman optical time domain reflectometer and its demodulation device, Brillouin optical time domain reflectometer and its demodulation device is connected with the signal input end of multi-core optical fiber through multi-core optical fiber fan-in fan-out module;The present application utilizes the principle of space division multiplexing, each fiber core in optical cable as separate sensing channel carries out measurement and signal transmission;Multi-core optical fiber fuses three kinds of distributed optical fiber sensing systems together, realizes in-situ measurement and mutual compensation decoupling of temperature, strain and vibration, improves the measurement precision of sensing system.

The application relates to a resource allocation method of a full-optical space division multiplexing elastic optical network, and belongs to the technical field of optical network communication. The method comprises the steps of fiber core grouping and spectrum partitioning, fiber core selection and L-shaped frequency block allocation. The fiber core grouping and spectrum partitioning step divides a seven-core optical fiber into three groups, divides an in-group priority area, and sets a grouping partition weight coefficient. The fiber core selection step arranges the fiber cores in descending order according to the fiber core weight values according to the frequency slot usage, the link length and the number of overlapping frequency slots between the fiber cores on a path, selects the fiber core with the maximum weight value as a transmission fiber core, the L-shaped frequency block allocation step obtains an L-shaped frequency block set satisfying the connection type limitation and the crosstalk threshold limitation according to the remaining unallocated frequency blocks and the frequency block allocation limitation condition, and selects the L-shaped frequency block with the maximum weight value as a transmission frequency block by using an L-shaped frequency block weight calculation formula. The application can balance the number of idle slice machines at each node on the network and guarantee efficient transmission of service requests.

The invention relates to a multi-core optical fiber cable for communication, and belongs to the technical field of multi-core optical fibers, the multi-core optical fiber cable for communication comprises a conveying cable body, the conveying cable body is composed of a conveying wire core, a reinforcing layer and a protective sleeve, the reinforcing layer continuously wraps the outer portion of the conveying wire core in the length direction of the conveying wire core and is fixed, and the protective sleeve is formed after the reinforcing layer is fixed. The optical fiber is of a fluorine-doped cladding structure, long-distance and low-crosstalk space division multiplexing optical signal transmission can be achieved, the transmission cores of the device are arranged in a multi-core mode, and the transmission cores of the device are arranged in a multi-core mode. Therefore, large-capacity information transmission can be carried out; and the capacity is expanded without increasing the laying space and cost, and the device adopts the metal reinforcing core and the double-sided plastic-coated steel strip armoring to jointly provide excellent pressure resistance, flexibility and high-strength protection performance, so that the normal use function of the device is ensured.

The invention discloses a high-coherence wavelength division-space division multiplexing signal transmission system based on Delta-Sigma modulation. The high-coherence wavelength division-space division multiplexing signal transmission system is composed of a transmitting end and a receiving end. The core architecture of the transmitting end comprises a first narrow linewidth laser (DFB) serving as a light source base, a cascade modulator module (including a first MZM and a phase modulator PM) serving as a signal processing core, a demultiplexing demultiplexer, an annular cavity, a second DFB, a second MZM and a wavelength division multiplexer. The cascade modulator module is mainly used for generating an optical frequency comb with a narrow linewidth distribution characteristic, a single comb line of the optical frequency comb is used as an independent carrier, and multiple paths of signals combined by a wavelength division multiplexer are sent to a multi-core optical fiber, so that the combination of wavelength division and space division multiplexing technologies is realized, and the capacity upper limit of communication transmission is remarkably improved. According to the invention, the maximization of the communication capacity is realized under the condition of limited link bandwidth, and meanwhile, the undistorted transmission is ensured.

The application provides a grouping method and device of a user terminal, electronic equipment and a storage medium, and belongs to the technical field of wireless communication, and the application updates the maximum total data stream number that can be supported by matching MU-MIMO through the maximum total data stream number that can be distributed by the current user terminal, and is beneficial to improving the accuracy of grouping the current user terminal. When the sum of the existing total data stream number of the existing user terminal in the matching MU-MIMO group and the required data stream number of the current user terminal is less than or equal to the updated maximum total data stream number that can be supported, the current user terminal and the existing user terminal are both in spatial domain orthogonality, the current user terminal is added to the matching MU-MIMO group, the grouping of the current user terminal meets the transmission rate requirement of the user terminal as much as possible, meanwhile, the inter-user interference caused by "space division multiplexing" and the maximum utilization of frequency spectrum resources are taken into account, and the scheduling efficiency of the user terminal is improved.

The invention discloses a multimode cladding pumping resonance space division multiplexing optical fiber amplifier and an implementation method thereof, and relates to the technical field of optical fiber amplifiers. The multimode cladding pumping resonance space division multiplexing optical fiber amplifier comprises a transmission optical fiber, an active optical fiber, a multimode pumping optical fiber and a resonant cavity; the active optical fiber is one of a multimode optical fiber, a multi-core optical fiber and a multi-core multimode optical fiber and is used for realizing stimulated radiation amplification of multichannel signal light; the multi-mode pumping optical fiber is coupled with the active optical fiber through a pumping coupling assembly to form a pumping injection path which is used for accessing an external multi-mode pumping source and injecting pumping light into a cladding of the active optical fiber; by constructing a resonant light path for pumping recycling, residual pumping is converted into reusable effective pumping, so that the residual pumping participates in the pumping effect on the active section for multiple times in the system, the equivalent pumping intensity and the accumulative absorption amount of the active section are improved under the condition that the rated power of an external pumping source is not remarkably increased, and the energy consumption of the active section is reduced. The purposes of improving the gain efficiency and reducing the thermal load are achieved.

The application discloses a design method and system of a polarization detection metasurface. The method comprises the following steps: establishing a microstructure model, scanning the phase delay of microstructures with different geometric sizes under x and y polarizations; specifying two groups of orthogonal polarization states and target propagation angles, calculating the supercell size and the number of microstructures contained therein, and confirming the polarization beam splitting target required under the two groups of orthogonal polarization states; calculating the Jones matrix of each microstructure in the supercell and selecting a group of microstructure parameters as the initial solution; establishing a supercell model according to the initial solution and performing forward propagation simulation to obtain the diffraction order intensity distribution under the two groups of orthogonal polarizations, and constructing a loss function to obtain the optimal supercell structure meeting the polarization beam splitting target after iterative optimization; and performing two-dimensional periodic expansion on the supercell structure to obtain a metasurface structure. The application can realize efficient separation of multiple polarization states on a single metasurface, avoids the crosstalk problem in the traditional space division multiplexing mode, and improves the spatial resolution.

The invention discloses an MZI-based space division multiplexing convolution parallel computing method, which comprises the following steps of: configuring an MZI array through an in-situ training algorithm, and enabling the MZI array to respectively present target transmission characteristics corresponding to N preset convolution kernels for incoherent light with N preset wavelengths in a single control state. When calculation is carried out, an input vector to be processed is coded into incident power of light of N wavelengths and injected into the array, the superposition value of the light power of each wavelength is directly detected at an output port of the array, and the superposition value is an N-path parallel convolution result. The system of the invention correspondingly includes an incident layer, a multi-wavelength operating MZI array, and a summing layer. According to the method, the calculation parallelism degree can be improved by N times without increasing hardware overhead, the unitary matrix limitation of a traditional MZI array is broken through, the calculation density and the hardware utilization efficiency are remarkably improved, and the method has wide application prospects in the field of photon calculation.

The invention discloses a design method and system of a polarization detection metasurface. The method comprises the following steps: establishing a microstructure model, and scanning phase delays of microstructures with different geometric dimensions under x and y polarization; specifying two groups of cross-polarization states and target propagation angles thereof, calculating the size of a super-unit cell and the number of microstructures contained in the super-unit cell, and confirming polarization beam splitting targets required in the two groups of cross-polarization states; calculating a Jones matrix of each microstructure in the supercell and selecting a group of microstructure parameters as an initial solution; establishing a super-cell model according to the initial solution and performing forward propagation simulation to obtain diffraction order intensity distribution under two groups of orthogonal polarization, and constructing a loss function to perform iterative optimization to obtain an optimal super-cell structure meeting a polarization beam splitting target; and carrying out two-dimensional periodic expansion on the super-unit cell structure to obtain the super-surface structure. According to the invention, efficient separation of multiple polarization states can be realized on a single metasurface, the crosstalk problem in a traditional space division multiplexing mode is avoided, and the spatial resolution is improved.

A communication method and a related apparatus. In the method, a first apparatus determines a first resource of a first demodulation reference signal (DMRS), wherein a first resource pattern of the first resource comprises at least one or more of a first-type pattern, a second-type pattern, or a third-type pattern, the DMRS of the first-type pattern occupies three resource units in a first frequency domain unit of a first antenna port, the DMRS of the second-type pattern occupies two resource units in a second frequency domain unit of a second antenna port, and the DMRS of the third-type pattern occupies one resource unit in a third frequency domain unit of a third antenna port; and the first apparatus sends or receives the first DMRS on the first resource. The method can improve the transmission performance of DMRSs, and can achieve MU space-division multiplexing between a plurality of apparatuses.

The application discloses a kind of based on neural network master-slave architecture's space division multiplexing transmission optical signal demodulation method, comprising:1. Adopt time window input to capture inter-symbol time correlation, construct Transformer encoder architecture, through multi-head self-attention global modeling mode-to-mode crosstalk and time dependence, fusion multimodal physical parameter feature;2. Select reference mode to train basic network, use transfer learning to quickly adapt other space division multiplexing mode, reduce training data amount;3. Structured pruning is carried out to each mode Transformer network, according to the importance of attention head and neuron, remove redundant structure, realize lightweight deployment;4. According to bit MSE allocation demodulation mode, the bit with good training effect uses lightweight network, and the rest uses Log-MAP algorithm;According to channel quality dynamic adjustment network depth and the number of attention heads in real-time demodulation, balance complexity and performance.The application can improve demodulation performance, reduce data demand, enhance channel adaptability, realize high-performance low-power real-time demodulation.

The present application provides a communication method and an apparatus, which are used for preventing mismatches between transmitter precoding and receivers from affecting the space division multiplexing performance of communication systems. The method comprises: sending a first reference signal by means of a first reference signal port, and sending a second reference signal by means of a second reference signal port; receiving first indication information, the first indication information indicating that a first reference signal port group to which the first reference signal port belongs corresponds to a first demodulation reference signal (DMRS) port group; and receiving a DMRS by means of at least one DMRS port comprised in the first DMRS port group.

The invention discloses a method for accurately and synchronously exciting optical signals by a space division multiplexer based on time calibration. A calibration system mainly comprises a tunable laser, an M-path optical splitter, an adjustable delay line array and the space division multiplexer, one delay line is connected with a reference port of the space division multiplexer to form a reference branch, and the other delay lines are respectively connected with ports to be calibrated to form a plurality of branches to be calibrated. During each time of calibration, light transmission of the reference branch and one branch to be calibrated is maintained, data is collected and Fourier transform is carried out, and a peak value is extracted to obtain relative time delay. And adjusting the corresponding delay line according to the time delay until the time delay is zero, and completing the calibration of the current branch. According to the invention, accurate excitation of the mode can be realized by using the space division multiplexer, and the delay of the tail fiber of the space division multiplexer is effectively calibrated through the adjustable delay line array, so that different optical signals are synchronously and accurately excited.

The present application relates to an energy data processing method and apparatus, and a computer device, a storage medium and a computer program product. The method comprises: obtaining original energy data on the basis of space division multiplexing transmission of energy data; sequentially performing denoising processing and data quality evaluation processing on the original energy data, so as to obtain denoised energy data and a quality evaluation result of the denoised energy data; on the basis of the quality evaluation result, performing denoising processing on the denoised energy data again, so as to obtain target energy data; and inputting the target energy data into a trained energy scheduling processing model, so as to obtain target scheduling information of the target energy data. By using the method, the energy data processing efficiency can be improved, and the scheduling effect on an energy device can also be improved using target scheduling information, thereby realizing the intelligent management of the energy device.

This invention relates to a multi-core elliptical polarization-maintaining optical fiber and its fabrication method. The optical fiber includes a common cladding and polarization-maintaining core regions distributed within the common cladding. The polarization-maintaining core regions are elliptical, and there are at least three elliptical polarization-maintaining core regions spaced apart circumferentially. This invention features a compact structure, low crosstalk, and facilitates the placement of more polarization-maintaining core regions within a limited fiber cross-section. This allows the elliptical multi-core polarization-maintaining optical fiber to achieve higher density and greater capacity, as well as better polarization-maintaining performance, through space-division multiplexing. The uniform circumferential spacing of each elliptical polarization-maintaining core region forms a corresponding co-orientation structure, which is beneficial for controlling the cladding roundness during fiber drawing and for controlling inter-core crosstalk. This invention simultaneously increases the effective length of the optical fiber and achieves polarization-maintaining performance, providing more transmission channels and stronger birefringence performance, and has broad application prospects in the miniaturization of fiber optic gyroscopes and devices.

A method for MMW wireless communications, comprising the steps of: at a central office, with a QD MWL source, generating at least one optical signal comprising a plurality of different frequency signals; splitting the at least one optical signal into at least one first split signal and at least one second split signal; modulating the at least one first split signal with at least one wireless data signal and generating at least one downlink optical data signal, wherein the at least one frequency signal of the first split optical signal of the QD-MWL is used as an optical local oscillator (LO) for synthesizing RF MMW wireless signals remotely by mixing with the at least one downlink optical data signal; and the at least second split signal of the QD-MWL is used as an optical LO for the receiving uplink wireless signals at the central office.

The embodiment of the invention discloses multiple PDCCH space division multiplexing methods, devices and equipment, and the method comprises the steps: determining a transmitting power threshold value of terminal equipment in a PDCCH scheduling period based on the opposite end signal power and the line-of-sight probability of the terminal equipment in a wave beam coverage area of a base station, and transmitting the transmitting power threshold value of the terminal equipment in the PDCCH scheduling period according to the transmitting power threshold value of the terminal equipment in the wave beam coverage area of the base station, and determining a mapping relationship between a control channel element and an analog beam based on the position information, the pitch angle and the line-of-sight probability of the terminal device, optimizing a beam forming weight corresponding to the terminal device based on the mapping relationship to obtain an optimized beam forming weight, and sending a scheduling instruction to the terminal device. The scheduling instruction comprises the transmitting power threshold value and the optimized beam forming weight, and the scheduling instruction is used for triggering the terminal equipment to determine a receiving beam based on the optimized pitch angle beam forming weight, and adjusting the transmitting power based on the transmitting power threshold value.

The application provides a control system, method, device and storage medium for medical implant devices, the system comprising: an extracorporeal acoustic holograph phased array and at least one implant device to be controlled wirelessly connected with the extracorporeal acoustic holograph phased array, wherein the extracorporeal acoustic holograph phased array is used to construct a special acoustic field, emit ultrasonic waves to the implant device, adjust different types of implant devices located at different positions, locate and track the position of the implant device in a moving state, perform space division multiplexing, and realize synchronous control of wireless power supply, wireless operation and wireless communication of the implant device at different positions; the implant device is used to receive the ultrasonic control signal, set a corresponding form of ultrasonic wireless signal, supply power to the device, control the trigger of the device, and execute the derived function of the device. The application has the characteristic of "space division multiplexing", can simultaneously operate the devices at different positions, and can realize different operation functions at different positions.

The invention relates to a dynamic routing method based on storage and forwarding in a space division multiplexing elastic optical network, and belongs to the technical field of communication. The method comprises the following steps: firstly, acquiring the current state of a time-shifting multilayer graph, performing routing in the time-shifting multilayer graph, then determining the total occupied frequency slot number according to a path distance and a modulation format, and selecting a transmission path of a request in combination with the balance of multi-dimensional resources; then grouping and grading the fiber cores by using a graph dyeing method, and selecting the fiber cores for each link by considering crosstalk of the fiber cores and frequency slot use conditions according to a fiber core selection method designed in the invention; secondly, designing a frequency spectrum selection method, and selecting a proper frequency spectrum block for the request by comprehensively considering fragments of time domain and frequency domain dimensions; and finally, carrying out allocation in the time-shifting multilayer graph, and updating topology and resource use states until all requests are allocated. The storage and forwarding process can be simplified while the network capacity is improved, and the blocking rate is improved.

This invention provides a method and apparatus for compressing and encrypting snapshots of multiple 3D color objects based on spatial division multiplexing. The method includes: generating an object beam and a reference beam based on a three-primary-color laser source, and generating multiple composite three-color parallel beams based on the object beam; illuminating each 3D color object and a random phase mask connected to each 3D color object with the multiple composite three-color parallel beams, respectively, and calculating the light field distribution of each 3D color object on the corresponding random phase mask plane; encrypting the light field distribution using each random phase mask, and generating an object light field on a detector plane based on the encrypted light field distribution; and generating an encrypted color hologram of multiple 3D color objects by interfering with the reference beam on the detector plane through the object light field and the reference beam. This method can significantly reduce the crosstalk effect during decoding of different encrypted objects, greatly reduce the leakage of object information, and significantly improve security.

The application relates to a resource allocation method and system based on virtual optical network mapping. The method comprises the following steps: obtaining a virtual optical network; calculating a first time delay resource sensitivity according to a virtual link, and generating a virtual link mapping set in descending order according to the first time delay resource sensitivity; calculating a second time delay resource sensitivity according to a physical link, and generating a physical link mapping set in descending order according to the second time delay resource sensitivity; calculating a shortest path of the physical link, and generating a space division multiplexing data center elastic optical network mapping graph according to the shortest path and the second time delay resource sensitivity; mapping the virtual link to the physical link according to the space division multiplexing data center elastic optical network mapping graph, the virtual link mapping set and the physical link mapping set, and generating a first mapping result; mapping the virtual node to the physical node according to the first mapping result, and generating a second mapping result; and allocating a frequency spectrum resource according to the second mapping result. The purpose of improving resource efficiency and network resource utilization rate is achieved.

A method for indicating an uplink demodulation reference signal (DMRS) port, including: sending first indication information in a case where a terminal performs single downlink control information (S-DCI) based simultaneous transmission via multi-panel (STxMP) of a physical uplink shared channel (PUSCH) in a space division multiplexing (SDM) manner, where an indication field of an antenna port DMRS in DCI is configured to indicate a total number of all allocated DMRS ports, where the first indication information is configured to indicate a DMRS port that is respectively allocated when a transport block of the PUSCH is sent over a same time-frequency resource towards a different transmission and reception point (TRP) via a different panel; where a different TRP / panel / transmission configuration indicator (TCI) / transmission occasion (TO) is respectively associated with a different beam / TCI, and a correspondence relationship exists between the DMRS port and the panel.