394results about "Multimode transmission" patented technology

An optical communication system comprises a transmitter optically coupled to a single-mode optical channel, and a multimode optical fibre configured to support transmission of a plurality of guided modes. The plurality of guided modes comprises a target mode. The system further comprises an optical mode converter configured to optically couple the mode of the channel to the target mode of the multimode fibre by gradually changing a transverse profile of propagating light received from the channel to match a transverse profile of the target mode of the multimode fibre.

The invention relates to the field of data transmission, in particular to a multimode optical fiber image transmission method, system and device and a medium. The method comprises the steps of acquiring an original image of a target area through image acquisition equipment of the power transmission line operation robot; converting the original image into an optical signal and transmitting the optical signal through a multimode optical fiber to generate a speckle image with spatial disturbance characteristics; inputting the speckle image into a neural network model constructed based on a sliding window self-attention mechanism for image reconstruction; the reconstructed image is output to a power transmission line state analysis system for real-time monitoring; the sliding window self-attention block calculates local self-attention features in windows with fixed sizes through window multi-head self-attention and sliding window multi-head self-attention mechanisms which are alternately arranged, and feature interaction between adjacent windows is achieved through a sliding window mechanism. According to the method, the anti-interference capability and the dynamic environment adaptability are improved, the calculation complexity is reduced, and the model generalization capability is improved.

A quantum communications system includes a communications system that operates with a quantum key distribution (QKD) system, which includes a transmitter node, a receiver node, and a quantum communications channel coupling the transmitter node and receiver node. The transmitter node may cooperate with the quantum communications channel defining a Talbot effect image position along the quantum communications channel. The receiver node is located along the quantum communications channel at a midpoint of the Talbot effect image position.

The invention relates to the technical field of multi-plane light conversion, in particular to a multi-dimensional demultiplexing and frequency mixing system based on an MPLC and an optimization design method of the multi-dimensional demultiplexing and frequency mixing system. The system comprises an input module used for inputting multimode signal light and local oscillation light; the MPLC module is used for realizing unitary transformation of light in any space, comprises N cascaded phase transformation areas and is integrated on the reflecting mirror or the transmitting mirror; the phase transformation regions are phase plates or metasurfaces, and at least one phase transformation region is a metasurface; and the output module is used for receiving the single-mode Gaussian light spots after demultiplexing and frequency mixing. According to the invention, different phases of different wavelengths and different polarization states are regulated and controlled through the metasurface; parallel demultiplexing of wavelengths, polarization and modes in multimode signals can be realized.

An optical subsystem with flat lenses for multimode transceivers is provided. The optical subsystem includes a photonic integrated circuit (PIC). The optical subsystem also includes a vertical cavity surface emitting laser (VCSEL) disposed on the PIC, a photodetector disposed on the PIC, a transmit multimode fiber (TX-MMF) disposed on the PIC, and a receiver multimode fiber (RX-MMF) disposed on the PIC. The PIC includes a substrate, an oxide layer disposed above the substrate, and a plurality of metalenses disposed in the oxide layer. The substrate includes a polymer region and a mirror disposed at a base of the polymer region.

Systems and methods include an optical switch system which provides a combination of μLED arrays, PDs, imaging fiber cables, and crosspoint switch on a single chip. The system includes one or more input ports with each input port configured to connect to an input fiber bundle. The system additionally includes one or more output ports with each output port configured to connect to an output fiber cable, wherein each of the input fiber bundle and the output fiber cable include a plurality of fiber cores. An electrical crosspoint switch is connected to the one or more input ports and the one or more output ports, wherein the electrical crosspoint switch is configured to connect a given input port to a corresponding output port, including all signals in the input fiber cable to the corresponding output fiber cable.

Various example embodiments for supporting optical communications in an optical communication system may be configured to support dual-polarization alignment for dual-polarization communications within an optical communication network. Various example embodiments for supporting dual-polarization alignment, within an optical communication network supporting optical communications from a transmitter to a receiver based on dual polarizations including a first polarization and a second polarization, may be configured to support dual-polarization alignment to the dual polarizations at the receiver based on communication of a data segment such that a first portion of the data segment is communicated based on the first polarization and a second portion of the data segment is communicated based on the first polarization and the second polarization.

It is made possible to satisfactorily determine whether or not the light diameter of collimated light is within a defined range in a double mode.A light intensity distribution of collimated light including components of a fundamental mode and a first-order mode is acquired by a light intensity distribution acquisition section. A light intensity line corresponding to a predetermined light intensity lower than a maximum intensity of light intensity is acquired by a light intensity line acquisition section in reference to the light intensity distribution. The ratio of inclusion of the light intensity line in an annular region between a first circle and a second circle larger than the first circle with an optical axis of the collimated light in a center in an entire circular region centered on the optical axis of the collimated light is calculated by a ratio calculation section. Further, it is determined by a determination section whether or not the light diameter of the collimated light is within a defined range, in reference to the ratio.

The invention provides a spatial optical coupling efficiency rapid assembling and correcting method based on multimode optical fiber receiving, and solves the problems that the spatial translation and angle of an optical fiber end face need to be repeatedly and manually adjusted in an existing assembling and correcting method, single-time adjustment needs to consume more than 2 hours and needs to depend on experience of an operator; moreover, the precision deviation of manual reset can reach + / -5 [mu] m, resulting in that the coupling efficiency fluctuation exceeds + / -10%, and the consistency requirement in batch production is difficult to meet, and can be widely applied to the field of laser communication. The method specifically comprises the following steps: connecting a multimode fiber with a laser, and receiving a light beam refracted by a coupling receiving lens group by using a light beam analyzer; adjusting the position of a transmitting platform of the multimode optical fiber for multiple times, and recording the size and roundness of the light spot after each adjustment through an upper computer; in the recorded size and roundness data of the light spot, determining the relative minimum value of the size of the light spot when the roundness of the light spot is greater than 0.87; and the position of the emission platform with the relative minimum light spot size is used as the optimal installation and calibration position.

A system for transmitting a light signal between a first solid core optical fiber network and a hollow core fiber network includes a plurality of transponder-amplifiers, where each transponder-amplifier of the plurality of transponder-amplifiers comprises a transponder in optical communication with one of a power amplifier and a pre-amplifier. The plurality of transponder-amplifiers is in optical communication with the first solid core optical fiber network and is operative to receive a plurality of first light signals from the plurality of transponder amplifiers. A multiplexer located downstream of the plurality of transponder-amplifiers is operative to receive the plurality of first light signals. The multiplexer is operative to select between a plurality of first light signals and transmits at least one light signal of the plurality of first light signals to the hollow core fiber network.

A system can include a unit cell of a ring modulator of a coarse wavelength division multiplexing (CWDM) optical link. The unit cell includes a ring resonator including a ring waveguide configured to receive, via a first bus waveguide, an optical signal, and modulate the optical signal to generate a modulated optical signal. The unit cell further includes a multiplexer, disposed between the first bus waveguide and a second bus waveguide, configured to filter the modulated optical signal.

The invention relates to the technical field of laser communication, in particular to a free space optical communication system, device and method. According to the free space optical communication system provided by the invention, the space light beam is firstly coupled with the multimode optical fiber, and the characteristic that the diameter of a fiber core of the multimode optical fiber is larger is utilized, so that the coupling efficiency is improved, and the energy loss in the coupling process can be effectively reduced. Then, a mode demultiplexer is used, and a mode conversion technology is adopted to separate and convert multiple modes of light in the multimode optical fiber, so that the obtained LP01 mode is separated and converted into a fundamental mode of the single-mode optical fiber to serve as an output optical signal, and the problem that the modes of the multimode optical fiber and the single-mode optical fiber are not matched is solved through the mode conversion technology; and finally, the converted fundamental mode signal in the single-mode fiber is used for communication, so that a high-speed communication module can be better matched.

The invention provides an energy and signal co-transmission system based on photo-thermal electricity, the system comprises a plurality of lasers, a composite optical cable and a sensing and monitoring integrated module, the composite optical cable comprises a multimode optical fiber and a single-mode optical fiber, and the sensing and monitoring integrated module comprises a photo-thermal composite battery, an energy management unit and a sensing monitor which are connected in sequence; the plurality of lasers emit laser signals of a plurality of near-infrared bands, and the plurality of laser signals are transmitted to the photo-thermal composite battery through the multimode optical fiber; the photo-thermal composite battery converts a plurality of received laser signals into electric energy, collects waste heat generated in the energy conversion process and converts the collected waste heat into electric energy, and all the electric energy output by the photo-thermal composite battery is stored through the energy management unit to supply power to the sensing monitor; monitoring control information sent by a user side is transmitted to the sensing monitor through the single-mode optical fiber, and the sensing monitor collects monitoring information based on the monitoring control information and transmits the monitoring information to the user side through the single-mode optical fiber.

The invention discloses a communication parameter monitoring method and system, and relates to the technical field of optical fiber communication, the communication parameter monitoring method is applied to the communication parameter monitoring system, the communication parameter monitoring system comprises a sending end and a receiving end, and the communication parameter monitoring method comprises the following steps: the sending end inserts a preset pilot frequency in to-be-transmitted information to generate a modulation signal; the sending end sends the modulation signal to a receiving end, and a receiving signal is obtained after coherent receiving; the receiving end carries out digital signal processing on the received signal and extracts pilot frequency information; and the receiving end calculates communication parameters between the sending end and the receiving end according to the pilot frequency information. The signal and the frequency domain pilot frequency are simultaneously transmitted and received, and the power of the frequency domain pilot frequency is far less than the power of the signal, so that the influence on the signal can be ignored, the online monitoring can be realized on the basis of not interrupting the communication service, and the multi-damage cooperative monitoring is realized. Through the communication parameter monitoring method, guarantee can be provided for stable operation and resource scheduling of the space division multiplexing system.

Tunable metasurface optical fibers for advanced light manipulation are provided. In one embodiments, a tunable metasurface optical fiber device for light manipulation is provided, the tunable metasurface optical fiber device comprising: a multimode optical fiber configured to receive a phase modulated input beam; and an at least one optical metasurface(s), wherein each of the at least one optical metasurface(s) produces a tunable output.

A method and apparatus are provided. The method includes receiving, at a TE0 mode add / drop filter, a TE0 mode optical signal having a first wavelength and a second wavelength, and transmitting, from the TE0 mode add / drop filter, the TE0 mode optical signal having the first wavelength and the second wavelength towards a Bragg grating, without converting the TE0 mode optical signal having the first wavelength and the second wavelength to another mode. The method further includes receiving, at the TE0 mode add / drop filter, a reflected TE1 mode optical signal having the first wavelength from the Bragg grating, and transmitting, from the TE0 mode add / drop filter, the reflected TE1 mode optical signal having the first wavelength towards a photodetector, without converting the reflected TE1 mode optical signal having the first wavelength to another mode.

Some implementations described herein provide an optical receiver system. The optical receiver system includes optical circuitry that may include a phase shifter device, a demultiplexer device, a power combiner device, and / or a power splitter device. Different combinations of such devices within the optical circuitry may balance and / or reduce photocurrents within the photodiode device to improve a performance (e.g., a bandwidth) of the optical receiver system relative to another optical receiver system that does not include the optical circuitry.

The invention discloses a multi-mode optical switch and a multi-mode optical transmission system, and relates to the technical field of optical switchs.The multi-mode optical switch comprises a first beam splitter, an optical signal modulation assembly and a second beam splitter, and the first beam splitter is provided with an input port, a first output port and a second output port; the signal input end of the optical signal modulation assembly is connected to the first output port. The second beam splitter is provided with a third input port, a fourth input port, a third output port and a fourth output port, the third input port is connected to the second output port, and the fourth input port is connected to the signal output end of the optical signal modulation assembly; according to the technical scheme provided by the invention, the integrity of the multi-mode signal can be maintained, and meanwhile, the sub-millisecond-level high-speed switching is realized.

The invention discloses an ocean three-dimensional monitoring device in a large water depth environment, a control method thereof and a medium, and the device comprises a junction box module which is used for dynamically obtaining ocean monitoring data and transmitting the ocean monitoring data to a buoy module; the buoy module is used for switching communication channels by utilizing a heartbeat packet judgment mechanism, determining a target communication channel from a plurality of communication channels, establishing the target communication channel with the junction box module, and receiving the ocean monitoring data through the target communication channel; and the buoy module is used for transmitting the ocean monitoring data to a shore-based server through a wireless communication network. The invention provides a sound, light and electricity redundancy complementary communication architecture, in a large water depth environment, the data transmission success rate between the junction box and the buoy in the large water depth environment can be greatly improved, and the survival rate of the ocean three-dimensional monitoring device is remarkably improved. The method is widely applied to the technical field of marine monitoring.

Intensity control units 40A and 40B acquire the intensity of backscattered light when inputting signal light of two or more modes for each core in a multicore optical fiber 10, which has two or more cores and in which two or more modes propagate to each of the cores, so that the transmission direction of light differs between adjacent cores, and output a control signal for reducing the input optical power of a high-order mode other than a basic mode of the signal light by a predetermined amount so as to reduce the influence of the high-order mode on the basic mode.

The invention discloses a satellite-ground laser communication atmospheric channel compensation system and method. Relates to the technical field of satellite-ground laser communication, in particular to a satellite-ground laser communication atmospheric channel compensation system and method. Through structural coupling and parameter matching, deep collaboration of the multimode fiber and the MPLC is realized, and the optical signal coupling efficiency in the turbulent environment is remarkably improved on the premise of reducing the complexity, power consumption and cost of the system. In the system, a receiving module captures and focuses a multi-mode optical signal emitted by a satellite to a transmission connection module through a coupling lens group; the transmission connection module receives and transmits the multi-mode optical signal to the multi-mode input end of the MPLC through the fiber core of the multi-mode optical fiber; and the modal screening module decomposes a multi-modal optical signal received by the multi-modal input end of the MPLC through the MPLC optical mode demultiplexing module to obtain a plurality of modal fundamental modes, and outputs the fundamental modes through the MPLC single-mode output end.

The present disclosure relates to "Electronic devices with high-frequency multi-mode communication capabilities." A wireless system can include a central processor and an access point. The central processor can generate an optical signal on an optical fiber. The optical signal can include an optical local oscillator (LO) signal and one or more carriers. The central processor can modulate different combinations of transverse optical modes, orbital angular momentum, polarization, and / or carrier frequencies of the optical signal to simultaneously transmit respective wireless data streams. The orthogonality of the transverse optical modes, the orbital angular momentum, the polarization, and the carrier frequencies can allow many wireless data streams to be modulated onto the optical signal and simultaneously transmitted and propagated on the optical fiber independent of one another for transmission to one or more external devices.

To provide a photonic computing system for enabling optical coupling between light fields associated with various propagation conditions in one or more photonic guide units associated with one or more processing tasks of an artificial light neuron unit, and to provide a network rack for housing a plurality of hardware modules including the photonic computing system.SOLUTION: A photonic computing system comprises an arrangement of a plurality of photonic processing units BFBl having an input port and an output port 14 / 16, each of the photonic processing units comprising: an array of photonic guiding units PGUn configured to define propagation conditions for a plurality of light fields associated with one or more optical processing tasks; and a plurality of optical connectors BCk. Each of the optical connectors couples the light field to the light field each other between the input port and the output port of the photonic processing units, thereby providing a network of communicating processing units.SELECTED DRAWING: Figure 1

Single-mode and multi-mode coaxial transceiver kilometer-level wireless optical communication devices belong to the field of wireless optical communication technology. Existing technologies fail to take into account both communication quality and communication distance under the premise of coaxial transceiver. The present invention is characterized in that a triple-clad optical fiber is arranged on the optical path between the optical antenna and the laser diode and photodiode; the triple-clad optical fiber is composed of a core, an inner cladding, a middle cladding and an outer cladding from the inside to the outside, and the middle cladding is doped with a laser working material and can generate laser light with the same wavelength as the communication light; at one end of the triple-clad optical fiber, the center is the core incident end face a, and the other two end faces are the inner cladding output end face b' and the middle cladding incident end face c, each made by the tapering technology; the end face of the other end of the triple-clad optical fiber is located at the back focus of the optical antenna; the laser diode light outlet and the core incident end face a are connected by a single-mode optical fiber; the inner cladding output end face b' and the photodiode light inlet are connected by a multi-mode optical fiber.

One aspect of the present invention is an optical transmission system including a transmitter connected to a transmission line having M spatial channels, and a receiver that receives a signal transmitted from the transmitter via the transmission line, wherein the transmitter includes: an allocator that allocates a transmission bit string transmitted to the transmission line into a bit string serving as a basic signal and a bit string serving as spatial channel information; a generator that generates N (M>N) signals from the bit string serving as the basic signal allocated by the allocator; and a selector that selects N spatial channels, through which the N signals generated by the generator are transmitted, from the M spatial channels on the basis of the bit string serving as the spatial channel information allocated by the allocator.

Systems and methods are described for transmitting information optically in free space. For instance, a system may include an optical signal generator to generate an amplified beam of light. A telescope transmits the amplified beam through the medium and receives an inbound beam of light. A detector system may include one or more (or multiple) detectors and a routing system that transmits the inbound beam to a selected set of detectors. In some cases, the system can determine a re-configuration condition based on control parameters and perform a system re-configuration to direct the inbound beam to a different set of detectors. In some cases, the system includes a remote fiber head or wavelength division multiplexing.

A method and a system for transmission of optical signals. One or more first and second multi-core optical components are coupled to all fiber cores in a multi-core fiber. An erbium-doped fiber amplifier (EDFA) optical component is coupled to all fiber cores in the multi-core fiber and includes a plurality of EDFAs. Each fiber core is coupled to an EDFA. The EDFA optical component is coupled to all fiber cores between the first and second multi-core optical components. First multi-core components are coupled at an input to a first portion of fiber cores and provide first functions, and are coupled at an output from a second portion of fiber cores and provide second functions. Second multi-core components are coupled at an output from the first portion of fiber cores and provide second functions, and are coupled to an input to the second portion of fiber cores and provide first functions.

Systems and methods include an optical transceiver configured to be connected to an optical cable (102) having multiple optical fiber cores, the optical transceiver including multiple transmitters (108) and multiple receivers (106), wherein the transmitters are connected to a first group of optical fiber cores in the optical cable and the receivers are connected to a second group of optical fiber cores in the optical cable. The optical transceiver includes an array of elements, wherein each element includes a pLED and a photodetector connected to a programmable conductor so that a training algorithm selects which conductors become active conductors in a data path. Associated circuitry such as a driver for the pLED and a TIA for the PD is also part of each element.

An apparatus having input and output ports using a plurality of optical connector adapters, wherein the fiber connections can follow a specific mesh pattern has a plurality of fibers inside the apparatus. The fibers pass through at least one mandrel and are designed to produce a leakage in the transmitted light from each fiber of least −30 dBm, wherein the fiber buffer of fibers around the mandrel are partially stripped in at least one section. The apparatus also has an imaging system consisting of at least a lens, camera sensor and an optical filter are placed in proximity to the fiber striped section wherein the optical filter has spectral properties tuned or partially tuned to the operational wavelength of the network and the optical filter is placed in the light path before the camera sensor.