80results about "Multimode transmission" patented technology

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.

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.

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.

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.

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%.

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.

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

A patch cord for transmitting between a single mode fiber (SMF) and a multi-mode fiber (MMFs) has a MMF, SMF, and a photonic crystal fiber (PCF) with a hollow core placed between the SMF and MMF. A mode field diameter (MFD) of the PCF hollow core section is in the range of 16 to 19 microns, the length of the PCF is between 1 cm to 10 cm, the MMF has 50±2 microns core diameter, the SMF has a 6-9 microns core diameter, and the coupling between the PCF mode to the MMF fundamental mode is maximized.

A system for transmitting optical signals between a first solid core optical fiber network and a hollow core optical fiber network, the system comprising 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 preamplifier. A plurality of transponder-amplifiers are in optical communication with the first solid fiber network and are configured to receive a plurality of first optical signals from the plurality of transponder-amplifiers. A multiplexer downstream of the plurality of transponder-amplifiers is used to receive a plurality of first optical signals. And a multiplexer for selecting between the plurality of first optical signals and transmitting at least one of the plurality of first optical signals to the air-core optical fiber network.

One aspect of the present invention is a signal detection device including a mode demultiplexer configured to convert N (N is a natural number) spatial mode signals including a plurality of higher modes excited in a transmission path fiber into N base modes and output the N basis modes, a frequency conversion unit configured to convert N optical signals into frequencies different from each other, a multiplexing unit configured to multiplex the N optical signals having frequencies that have been converted, and a reception unit configured to photoelectrically convert a multiplexed optical signal while maintaining modulation information for a phase and polarization, perform digital signal conversion and signal processing, and demodulate an original information sequence.

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 present disclosure is a base station system S that connects each of base station functional units that provides each of radio schemes and each of antenna units in each of provision areas via an optical fiber section, the base station system including passive light functional units disposed between each of base station functional units and each of antenna unit and including each downlink signal output port to which each downlink signal wavelength is allocated and each uplink signal output port to which each uplink signal wavelength is allocated and an optical switch disposed between each of the antenna units and the passive light functional units, accommodates some of each of the radio schemes, and switches to which one of the provision areas the some of the radio schemes are provided.

An optical data communication device includes a plurality of emitters. The plurality of emitters are configured to emit respective laser beams that are associated with a same spectral range and that are to couple into an input end of a multi-mode optical fiber. A size of an oxide aperture of each emitter, of the plurality of emitters, is less than or equal to 3.5 micrometers. Each emitter is a single-mode emitter or a reduced-mode emitter. A pitch between adjacent emitters is less than or equal to 30 micrometers. The plurality of emitters are disposed in a configuration pattern, wherein a central region of the configuration pattern does not include any emitter of the plurality of emitters.

A transmission system according to the present invention comprises an optical splitter, an upstream-side optical fiber, an upstream-side optical transceiver, a plurality of downstream-side optical fibers, and a plurality of downstream-side optical transceivers. The optical splitter has a trunk section core and a plurality of branch section cores branched from the downstream-side end of the trunk section core. The upstream-side optical fiber is connected to the upstream-side end of the trunk section core. The upstream-side optical transceiver is connected to the upstream-side end of the upstream-side optical fiber. The plurality of downstream-side optical fibers are connected to the downstream-side ends of the corresponding plurality of branch section cores. The plurality of downstream-side optical transceivers are connected to the downstream-side ends of the corresponding plurality of downstream-side optical fibers. The trunk section core is a multimode optical waveguide for transmitting an uplink optical signal in a plurality of waveguide modes.

An optical input / output chip and distributed computing system, including: output sub-chip includes first light processing module to form N first light branches output from laser source, divide and modulate each first light branch into M first light sub-branches according to M wavelengths, form second optical branches containing N different modes from N modulated first optical branches before being output in first polarization state; input sub-chip includes second optical processing module, to form N third optical branches containing same mode from N second optical branches containing different modes, divide out part of light in each third optical branch having been converted from first polarization state to second, and form first polarization state again, combine and demodulate light in the first polarization state without conversion in original third optical branch after having been divided into M second optical sub-branches according to M wavelengths respectively. Thus increasing both communication rate and bandwidth effectively.

The optical communication system includes an optical module and a host unit. The optical module has a fiber optic connector and a laser status pin, wherein the fiber optic connector is used to connect to the laser output end of an external laser source. When a first laser beam is detected through the fiber optic connector, the optical module sets the output of the laser status pin to a first value. The host unit connects to the laser status pin and has a control connector, wherein the control connector is used to connect to the external laser source. When the first value on the laser status pin is detected, the host unit outputs a release signal through the control connector, wherein the release signal causes the external laser source to change from outputting a second laser beam with a first power through the laser output end to outputting a third laser beam with a second power higher than the first power through the laser output end.

The present application relates to a kind of optical module debugging method for PCIe interface, PCIe optical module and PCIe equipment, belong to optical communication technical field, method includes: the optical module to be debugged is connected into first test system and starts link training process;If training fails, then execute optical module optimization process;If training succeeds, then the optical module to be debugged is connected into second test system;Equalization parameter is adjusted to the optical module to be debugged;The optical module to be debugged is connected into first test system, to send test information, if bit error rate is less than 1e-12, then debugging is successful, save optical module equalization parameter and optical module optimization result, end debugging, obtain PICe optical module, the present application realizes that PCIe data is carried out high-speed lossless transmission by optical fiber, compatible with existing PCIe equipment, applied to the optical interconnection of calculation unit in AI data center high-performance server, with high bandwidth, low latency, low power consumption, easy maintenance and the like.