137results about "Multimode transmission" patented technology

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.

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.

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.

A spatiotemporal optical multiplexer includes a storage optical cavity having a plurality of storage-cavity modes that are transversely separated, a dump optical cavity having a plurality of dump-cavity modes that are transversely separated, and a phase modulator located in the dump cavity and overlapping all of the dump-cavity modes. Each dump-cavity mode is coupled to a respective storage-cavity mode. The storage-cavity modes have the same storage-cavity resonant frequency while the dump-cavity modes have dump-cavity resonant frequencies that are distinct. The phase modulator is driven to simultaneously tune the dump-cavity resonant frequencies. At any time, no more than one dump-cavity mode is resonant with its respective storage-cavity mode. When this resonance occurs, the energy of the respective storage-cavity mode is coupled out of the storage cavity and through the dump cavity as an output pulse.

A multipath interference analysis device includes a statistical amount calculation unit that calculates statistical amounts of respective measurement values of splice loss measured from a plurality of optical fiber pieces for forming an optical transmission line, and measurement values of cutoff wavelength, a determination unit that determines a truncated normal distribution from a normal distribution of the cutoff wavelength, a random number generation unit that generates random numbers for selecting a predetermined number of pieces of splice connection targets of the optical transmission line, and an MPI value calculation unit that calculates an MPI value using a mode dependent loss of a fundamental mode of the optical transmission line formed of each piece selected according to the random numbers, and a splice interval.

An advanced integrated optical transceiver enables super high-speed communication between chips such as GPUs and HBM. Designs for such a transceiver may be based on an array of GaN micro-LEDs and an array of Si photodetectors (PDs) which are hybrid bonded (i.e. via “direct bond interconnect”) to a CMOS chip. Hybrid bonding makes the integrated optical transceiver very small and highly reliable.

The application discloses an optical signal inner circulation delay system based on electro-optic polarization modulation, comprising a signal light source, a first polarization beam splitter prism, a first electro-optic polarization modulator, a second polarization beam splitter prism, a second electro-optic polarization modulator, a third polarization beam splitter prism, a first full reflection mirror, a first lens, a first optical fiber collimator, a single-mode / multi-mode optical fiber, a second lens, a second optical fiber collimator and a second full reflection mirror, forming a ring-shaped light path. The length of the single-mode / multi-mode optical fiber and the high level duration of the modulation electric signal are adjusted, the repetition frequency and the pulse width of the output optical signal can be changed respectively, and therefore the application can also be used for converting continuous light into controllable pulsed light. The number of times that the signal light circulates in the ring-shaped light path can be controlled through the loaded electric signal, the delay time is flexibly adjusted, and the delay time range is expanded.

An optical signal transmitting device comprises an optical transmitter and a mode converter. The optical transmitter transmits a multi-path transmitted initial optical signal to the mode converter, wherein the initial optical signal comprises a first optical signal and a second optical signal both having a first wavelength, and a third optical signal having a second wavelength different from first wavelength. The mode converter is configured to perform phase conversion on the incident initial optical signal to obtain and reflect a first target optical signal, which is single-path transmitted and comprises the third optical signal, the first optical signal transmitted in a first mode, and the second optical signal transmitted in a second mode different from the first mode.

The application discloses an implementation circuit for a 10G multimode optical module and the optical module, and relates to the technical field of optical communication transmission, wherein the circuit comprises an optical module sending circuit, a sending filter circuit, a master control circuit, a golden finger interface circuit, an optical module receiving circuit, a power supply circuit and a storage circuit; the optical module sending circuit is electrically connected with the sending filter circuit; the sending filter circuit is electrically connected with the master control circuit; the master control circuit is electrically connected with the golden finger interface circuit and the optical module receiving circuit respectively; and the golden finger interface circuit is electrically connected with the power supply circuit. The application optimizes the interface power-on buffer circuit, can effectively protect the internal circuit during power-on, optimizes the high-frequency transmission circuit, and improves the integrity and stability of signal transmission.

A non-degenerate mode few-mode multiplexer / demultiplexer based on a four-core transmission main channel is characterized in that a transmission channel of the mode division multiplexer / demultiplexer is composed of an elliptical four-core super-mode fiber core FEC-SFC and three single-mode fiber cores, the elliptical four-core super-mode fiber core at the coordinate center serves as the transmission main channel, and the single-mode fiber cores SMF1, SMF2 and SMF3 are transmission coupling channels; the length of the transmission main channel FEC-SFC is 3.588 mm, and the lengths of the SMF1, the SMF2 and the SMF3 are respectively 3.588 mm, 1.658 mm and 1.808 mm; the mode field characteristics in the optical fiber can be changed by reasonably setting parameters such as the position, the size and the refractive index distribution of the fiber core; according to the ultra-mode fiber core, the advantages of a pure silicon dioxide fiber core, an elliptical core and an ultra-mode fiber core are fused, the mode degeneracy of LP11a / LP11b is broken, four ultra-mode multiplexing and demultiplexing of LP01, LP11a, LP11b and LP21b are achieved, the refractive index fiber core made of pure silicon dioxide is adopted, and the low-loss performance is achieved; a transmission channel with a large effective refractive index difference is adopted, and the position and the length of the transmission channel are reasonably set, so that the low-crosstalk and high-extinction-ratio performance is realized, and the low-crosstalk and high-extinction-ratio optical fiber can be used for MIMO-FREE operation.

An optical power adjustment system includes a multi-mode light source, a mode demultiplexer, and an optical power adjustment apparatus. The multi-mode light source is configured to output a multi-mode optical signal, where the multi-mode optical signal includes N transverse-mode optical signals, N=2M, and M is an integer greater than 1. The mode demultiplexer is configured to convert the N transverse-mode optical signals into N fundamental-mode optical signals, and output the N fundamental-mode optical signals. The optical power adjustment apparatus includes M optical power adjustment modules and a control apparatus, each optical power adjustment module includes a plurality of phase shifters, and the control apparatus is electrically connected to the M optical power adjustment modules. A Kth optical power adjustment module includes 2K-1 multi-mode interferometers MMIs.

The invention discloses an optical fiber signal conversion device, which comprises a plurality of single-mode optical modules connected with a single-mode optical fiber connector for bidirectional signal transmission. And the multi-mode optical module is connected with the multi-mode optical fiber connector for bidirectional signal transmission, a receiving channel of the multi-mode optical module is connected with a sending channel of the single-mode optical module, and a sending channel of the multi-mode optical module is connected with a receiving channel of the single-mode optical module. And the VPX connector is connected with the multimode optical module. And the MCU main circuit performs work enabling on the optical module, communicates with the optical module, obtains the working state of the optical module, communicates with the outside through an I2C port, and reports the monitoring condition of the working state of the circuit. A VPX bus is selected as a high-speed serial bus, transmission of converting four pairs of single-mode double-fiber bidirectional optical signals into multimode optical fiber signals, transmission of converting two pairs of single-mode single-fiber bidirectional optical signals into multimode optical fiber signals and transmission of converting a group of single-mode four-path parallel optical receiving and transmitting integrated signals into multimode optical fiber signals are realized; and two pairs of high-speed differential SerDes signals are converted into multimode optical fiber signals for transmission.

A method includes receiving a modulated optical signal at a ring resonator. The ring resonator has a ring with a ring length and includes a coupling region. The method also includes splitting the modulated optical signal into a first portion and a second portion. The method further includes mixing a previous first portion of the modulated optical signal with the second portion of the modulated optical signal to obtain a mixed signal. In addition, the method includes measuring a measured energy of the mixed signal using a photodetector. The symbol has a symbol length. A coupling coefficient expressing a measured energy of the first portion relative to a measured energy of the modulated optical signal has a value of less than 50%.

Embodiments of an optical amplification apparatus are disclosed which include a first optical amplifier, a second optical amplifier, and a mode exchanger. The first optical amplifier is connected to an input port of the mode exchanger, and the second optical amplifier is connected to an output port of the mode exchanger. The first optical amplifier is configured to amplify optical signals carried in a plurality of transmission modes of a few-mode fiber, the plurality of transmission modes of the few-mode fiber may be grouped into N groups, each group includes two transmission modes, and N is a positive integer greater than or equal to 1. The mode exchanger is configured to exchange the two transmission modes carrying optical signals in each group. The second optical amplifier is configured to amplify the optical signals that are carried in the two transmission modes in each group and whose modes are exchanged.

A patch cord comprising a multi-mode fiber (MMF) having an MMF core diameter, and a photonic crystal fiber (PCF) having a hollow core having a mode field diameter (MFD) that is smaller than the MMF core diameter. The MMF and the PCF are spliced together, and the MMF and the PCF have been actively aligned to maximize the overlap integral of a fundamental mode of the MMF while minimizing the power in other modes.

An optical system includes an optical transmitter coupled to a signal transmitting path, an optical receiver coupled to a signal receiving path, and a phase plate array configured to couple a first portion of an optical beam to a first single-mode fiber and to couple other portions of the optical beam to a plurality of other single-mode fibers. The first portion of the optical beam corresponds to a fundamental optical mode and the other portions corresponds to a plurality of higher-order optical modes. The first single-mode fiber is coupled to both the signal transmitting path and the signal receiving path using an optical circulator, and the plurality of other single-mode fibers are coupled to the signal receiving path.

The invention discloses a multimode optical fiber PON (Passive Optical Network) system and a multimode PON optical module. The multimode optical fiber PON system consists of a multimode OLT (Optical Line Terminal) optical module, a multimode main optical fiber, a multimode optical splitter, a multimode branch optical fiber and a multimode ONU (Optical Network Unit) optical module, according to the multimode OLT optical module and the multimode ONU optical module, a laser, a laser driver, a detector, a transimpedance amplifier, a limiting amplifier and the like are directly mounted on a printed circuit board by adopting a planar optical waveguide assembly and a COB (Chip On Board) mode, so that photoelectric hybrid integrated packaging is realized, and the miniaturization design of the optical module is realized; the planar optical waveguide assembly realizes multiplexing transmission of two wavelength multimode laser beams through a 45-degree reflecting surface and a 45-degree placed multimode light splitting sheet structure; the welding type pin row connector ensures reliable fixation of the optical mode electrical interface, and the clamping jaw structure and the optical fiber contact pin of the multimode optical fiber assembly realize the anti-vibration pluggable optical interface design. The multimode optical fiber PON system provided by the invention meets the requirement of the system for point-to-multipoint optical fiber transmission in a short-distance range with low power consumption, low cost and high reliability.

The invention relates to an optical processing device (DR) for optically processing an incident light beam (I0) which has propagated through a free space and whose phase front is susceptible to distortion. The optical processing device (DR) comprises: mode conversion means (M) configured to break down at least a portion of the incident light beam (I0) into at least two elementary light beams (to); and an integrated photonic device (C) configured to coherently recombine the at least two elementary beams (to) and to produce at least one recombined beam () on the output optical port (P2). The basic light beam (arrival) propagates between the input optical port (P1) and the output optical port (P2) along at least two separate optical paths, respectively. The optical processing device (DR) is characterized in that at least one of the optical paths comprises at least one static delay element (D1, D2, D3) configured to equalize the propagation time of the elementary optical radiation along the optical path.

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.

The invention discloses a photoelectric logic gate and a multi-mode communication system based on a bidirectional photovoltaic effect, a WSe2 / alpha-MoO3 heterojunction structure is adopted, the photoelectric logic gate comprises a Si / SiO2 substrate, an alpha-MoO3 charge trapping layer and a WSe2 bipolar channel layer, the transfer direction of charges on a heterogeneous interface is controlled through the polarity of gate voltage (Vg), a built-in electric field with a reversible direction is formed in a WSe2 channel, and the bidirectional photovoltaic effect is achieved. And positive / negative polarity photovoltaic response switching of the same light source is realized. Various reconfigurable logic gates such as AND / NAND / XNOR / NOT can be realized by configuring different input / control signals (laser, bias voltage and grid voltage); the grid voltage input, the bias voltage input and the illumination input are cooperatively regulated and controlled, the output current is in four distinguishable states, and multi-mode photoelectric communication is achieved. The single device integrates multiple logic functions, breaks through the limitation of singleness of traditional photoelectric response, and is suitable for a high-density optical calculation and communication system.

Techniques for implementing an internal optical communication link in a power amplifier system are disclosed. In one embodiment, the techniques may be realized as a power amplifier system that includes a panel, an optical link, and a controller. The panel includes a plurality of signal endpoints and a first optical interface, the first optical interface being coupled to each of the plurality of signal endpoints. The optical link is coupled to the first optical interface. The controller is configured to manage operation of the power amplifier system and is coupled to the optical link via a second optical interface. The controller communicates with each of the plurality of signal endpoints over the optical link.

One aspect of the present invention provides a signal processing apparatus including: filter processors, the number of the filter processors depending on the number of spatial modes of a received optical signal; a sum operator that outputs a sum of outputs of a plurality of the filter processors; an IFFT processor that performs inverse Fourier transform on the sum; an output signal selector that outputs a signal including only a predetermined part of an output of the IFFT processor; an error signal output that outputs, as an error signal, a difference between an output of the output signal selector and a desired signal; and an FFT processor that performs Fourier transform on signals including the error signal, in which the filter processors update a filter weight coefficient by using a signal obtained by performing multiplication only on a predetermined part for an output of the FFT processor and a signal obtained by performing processing including Fourier transform on the received optical signal, and the filter processors output a signal obtained by performing multiplication only on a predetermined part for the filter weight coefficient and the received optical signal.

The invention relates to a quantum network, in particular to a large-scale reconfigurable multiplexing quantum network system, a working method and a local multi-user quantum network, the large-scale reconfigurable multiplexing quantum network system at least comprises two independent local networks, and each network comprises a high-dimensional entanglement source and a plurality of user nodes. A high-dimensional space mode entanglement state generated by the high-dimensional entanglement source is multiplexed into a plurality of quantum bit entanglement channels to be distributed to each user node; the programmable multi-port interconnection equipment is used for connecting the local multi-user quantum networks to form a global quantum network capable of reconstructing entangled connection as required; the user node is provided with a detection device comprising a spatial light modulator, a single-mode optical fiber and a single-photon detector and can execute projection measurement in any spatial mode; according to the technical scheme provided by the invention, the defect that a large-scale and reconfigurable global quantum network capable of simultaneously carrying out entanglement routing and entanglement exchange on a plurality of channels is difficult to realize in the prior art can be effectively overcome.

This invention enables reduction of power consumption while ensuring the waveform quality of a received signal.　Provided is an optical communication system wherein a transmitter and a receiver are connected by an optical waveguide and communicate with each other using light of a second wavelength. Herein, the optical waveguide only propagates a fundamental mode at a first wavelength, and the second wavelength is a wavelength at which the optical waveguide can propagate at least a primary mode together with the fundamental mode. An inter-mode propagation delay difference adjusting unit makes an adjustment such that the primary mode lags by one unit interval relative to the fundamental mode in an optical communication path for the light of the second wavelength including the optical waveguide. Furthermore, for example, a mode ratio adjusting unit adjusts the ratio between the fundamental mode and the primary mode in the light of the second wavelength incident on the optical waveguide from the transmitter.

A multimode optical fiber having a core region. The core region includes silica, has an outer radius r1, and has a maximum relative refractive index of about 1.5% or less. Further, the multimode optical fiber is configured to have an effective bandwidth of about 4.7 GHz-Km or more for an excited portion of the core region having a diameter greater than 50 microns, the effective bandwidth being at a wavelength in a range of about 800 to about 1370 nm.

An optical communication system 1 comprising: a single-mode optical channel 21 having an optically coupled transmitter 9; a multimode optical fibre 5 configured to support transmission of a plurality