428results about "Polarisation multiplex systems" patented technology

A machine vision system may include a meta-imager including a meta-optic and a polarization-sensitive photodetector. A machine vision system may further include and at least one processor operably coupled to the polarization-sensitive photodetector, and at least one memory operably coupled to the at least one processor. A machine vision system may be configured to: receive, from the polarization-sensitive photodetector, a plurality of feature maps; input, into a trained artificial neural network, the plurality of feature maps; and process, using the trained artificial neural network, the plurality of feature maps to recognize an object.

The invention relates to an optical fiber communication sensing integrated architecture and a working method thereof. Comprising a sensing system laser, a coupler, a polarization beam splitter, a semiconductor optical amplifier, a polarization multiplexing communication transmitting system, a polarization wavelength two-dimensional demultiplexer, namely a WDM-PM device, a coarse wavelength division multiplexer MMI-WDM, a single-mode fiber, a polarization multiplexing communication receiving system, a polarization diversity double-balanced photoelectric detector PBPD, and an ROTDR and phi OTDR data processing unit. According to the invention, not only can high-capacity and long-distance communication under fusion of polarization multiplexing and wavelength division multiplexing be realized, but also sensing and communication can be fused through a wavelength division multiplexing system, the quality of sensing signals is improved through polarization diversity reception on the basis, and mutual promotion of communication and sensing is realized.

The invention discloses an optical interconnection system on an optical chip and the optical chip, relates to the technical field of communication, and aims to solve the technical problem of low system data capacity in the wavelength division multiplexing technology in the prior art. The system comprises a micro-ring modulation device, a polarization combiner and a demultiplexer, the output end of the micro-ring modulation device is connected with the input end of the polarization combiner; the input end of the demultiplexer is connected with the output end of the polarization combiner; the micro-ring modulation device is used for performing signal modulation on TE0 polarized light and TM0 polarized light in the light source; the polarization combiner is used for combining the TE0 polarized light and the TM0 polarized light output by the micro-ring modulation device and outputting combined light; and the demultiplexer is used for decomposing the combined light into signals corresponding to a plurality of wavelengths. By combining the polarization multiplexing technology and the wavelength division multiplexing technology, the number of multiplexing channels of the optical interconnection system is multiplied, and the data capacity of the optical interconnection system is improved.

Transport networks, network elements, and methods of use are described herein, including a transmitter comprising a client-side input, transmitter circuitry, and antennas. The client-side input is configured to receive baseband signals having client data encoded therein. The transmitter circuitry is configured to receive the baseband signals from the client-side input and generate antenna feed signals based on the baseband signals. The antennas are configured to receive the antenna feed signals from the transmitter circuitry, generate radiated signals based on the antenna feed signals, and couple the radiated signals into a hollow waveguide. Each of the radiated signals is a radiated electromagnetic wave configured for coherent detection and has a frequency in a range between 300 Gigahertz (GHz) and 10 Terahertz (THz).

A dual-polarization (DP) intensity-modulated direct detection (IMDD) receiver includes an input port configured to receive input light; an optical polarization splitter configured to split the input light into a pair of optical transmission paths; a pair of photodetectors including (i) a first photodetector configured to detect light at a first carrier frequency and output an electrical signal into a first electrical transmission path, (ii) a second photodetector configured to detect light at a second carrier frequency and output an electrical signal into a second electrical transmission path, wherein the first carrier frequency and the second carrier frequency are separated by a frequency difference; and an electrical 2×2 multi-input-multi-output (MIMO) polarization demultiplexer configured to input the first electrical transmission path and the second electrical transmission path and perform electrical 2×2 MIMO polarization demultiplexing to output a first demultiplexed signal and a second demultiplexed signal.

The invention discloses a method of an optical anti-turbulence device for polarization multiplexing spatial optical communication. The mode demultiplexer is connected with the optical fiber; the single-mode optical fiber array is respectively coupled with each spatial intrinsic mode decomposed by the mode demultiplexer; the polarization CBC chip is connected with the other end of the single-mode optical fiber array; the driving control module is connected with the polarization CBC chip; the polarization multiplexing optical communication digital coherent receiver (Rx) is connected with the polarization CBC chip through a single-mode optical fiber; through the arrangement of the polarization CBC chip, the compatibility of a polarization multiplexing technology and a mode multiplexing coherent beam combination technology is realized, the problem of polarization dimension information loss or strong crosstalk caused by the use of a polarization state rotator (PSR) and a polarization maintaining optical fiber in the prior art is solved, modulation information of two orthogonal polarization dimensions is completely reserved, the communication bandwidth is improved, and the communication efficiency is improved. And the communication efficiency is greatly improved.

Methods, systems, and apparatus, including computer programs encoded on computer storage media, for generating, transmitting, directing, receiving, and processing optical subcarriers. In some implementations, a system includes a Tier 1 switch that supplies a plurality of data channels; a transmitter that receives the plurality of data channels, the transmitter including an optical modulator that supplies a plurality of optical subcarriers based on the plurality of data channels; an optical platform that receives the plurality of optical subcarriers, the optical platform having a plurality of outputs, each of which supplying at least one of the plurality of subcarriers; a plurality of receivers, each receiving one or more of the plurality of optical subcarriers and supplying one or more of the plurality of data channels; and a plurality of servers, each of which receiving one or more of the plurality of data channels.

A control signal transmission device for a quantum computer is provided. The control signal transmission device includes a laser source, a digital-to-analog converter (DAC), an electro-optic modulation circuit, an optical fiber, an optic-electro demodulation circuit and a plurality of qubits. The laser source provides a light. The DAC provides a plurality of first control signals. The electro-optic modulation circuit integrates the corresponding first control signals into the light to generate an optical signal, and provides the optical signal to the optical fiber. The optic-electro demodulation circuit converts and splits the optical signal into a plurality of second control signals. The optic-electro demodulation circuit transmits the second control signals to the corresponding qubits. The qubits are controlled by the corresponding second control signals. An ambient temperature set by the optic-electro demodulation circuit and the qubits is much lower than a preset temperature value.

Various example embodiments for supporting optical communications in an optical communication system may be configured to support dual-polarization based communications within the context of a direct detection based point-to-multipoint optical network (e.g., a passive optical network (PON) based on direction detection). Various example embodiments for supporting optical communications in an optical communication system may be configured to support optical communications based on application of dual polarizations to each of one or more wavelengths within the context of a direct detection based point-to-multipoint optical network to support multiple optical channels within the direct detection based point-to-multipoint optical network (e.g., a single wavelength with two polarizations to provide two optical channels, two wavelengths each with two polarizations to provide four optical channels, three wavelengths each with two polarizations to provide six optical channels, and so forth) and, thus, support increased data carrying capacity within the direct detection based point-to-multipoint optical network.

An optical circuit is used with continuous wave signals having different wavelengths at a channel spacing from one another. A portion of the optical circuit is implemented in a photonic integrated circuit. Modulators in a modulation stage modulate the continuous wave signals to produce modulated signals. A multiplexing stage, which can have multiplexing filters, power combiners, or power couplers, multiplexes the continuous wave or modulated signals to produce multiplexed signals. The multiplexing stage may be placed either before or after the modulation stage. One or more polarization rotator and combiner (PRC) devices in a final stage combines the multiplexed signals into an output signal. The output signal has a first set of the different wavelengths at a first polarization and has a second separate set of the different wavelengths at a second polarization orthogonal to the first polarization.

Provided is an optical communication system comprising a polarization-diversity optical power supply capable of supplying light over a non-polarization-maintaining optical fiber to a polarization-sensitive modulation device. In an example embodiment, the polarization-diversity optical power supply operates to accommodate random polarization fluctuations within the non-polarization-maintaining optical fiber and enables an equal-power split at a passive polarization splitter preceding the polarization-sensitive modulation device.

An electro-optic receiver includes a bus optical waveguide and a plurality of wavelength division multiplexing (WDM) receiver slices positioned along the bus optical waveguide. Each of the plurality of WDM receiver slices includes a WDM element optically coupled to the bus optical waveguide, a photodetector, and a receiver circuit. The photodetector is optically connected to the WDM element by both a first optical connection and a second optical connection. The WDM element conveys a first component of input light through the first optical connection to the photodetector, and a second component of input light through the second optical connection to the photodetector, where first and second components of input light travel in opposite directions through the bus optical waveguide. The receiver circuit generates an electrical data signal from photocurrents received from the photodetector.

A chromatic dispersion compensation filter is configured to multiply each of a real component and an imaginary component of each of a first polarization and a second polarization of a polarization-multiplexed optical signal by a filter coefficient that compensates for chromatic dispersion. An adaptive equalizer is configured to multiply input signals and their phase conjugates by a complex impulse response and add the signals multiplied by the complex impulse response. The adaptive equalizer is configured to perform, for each polarization, phase rotation for carrier phase compensation including a frequency offset and rotation reverse to the phase rotation and add, for each polarization, the signals subjected to the phase rotation and the signals subjected to the rotation reverse to the phase rotation.

A communication network includes a coherent optics transmitter, a coherent optics receiver, an optical transport medium operably coupling the coherent optics transmitter to the coherent optics receiver, and a coherent optics interface. The coherent optics interface includes a lineside interface portion, a clientside interface portion, and a control interface portion.

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.

Provided is an optical communication system comprising a polarization-diversity optical power supply capable of supplying light over a non-polarization-maintaining optical fiber to a polarization-sensitive modulation device. In an example embodiment, the polarization-diversity optical power supply operates to accommodate random polarization fluctuations within the non-polarization-maintaining optical fiber and enables an equal-power split at a passive polarization splitter preceding the polarization-sensitive modulation device.

Described herein is an optical free-space communications system (100). The system (100) includes one or more inputs (102) for receiving one or more input signals (104). Each input signal (104) includes a respective data stream to be transmitted. An optical carrier signal generator module (114) is configured to generate an optical carrier signal (106). The optical carrier signal generator module includes an optical microcomb generator (116) to generate a plurality of coherent discrete, equally spaced optical frequency channels (118) and an optical spectral shaper (116) configured to selectively apply respective amplitude weightings to the optical frequency channels (118). System (100) includes a plurality of coherent modulators (108, 128) configured to modulate an optical frequency channel (118) with a respective one of the one or more input signals (104) to generate an optical transmission signal (132). A signal transmission module (130) is configured to directionally transmit the optical transmission signal (132) across a region of free-space (102) to a target location. Finally, a coherent receiver module (112) is positioned at the target location and configured to receive the transmitted optical transmission signal (132) and to decode phase and amplitude information of the one or more input signals (104) from each of the modulated optical frequency channels (118).

Systems and methods for increasing throughput of a photonic processor by using photonic degrees of freedom (DOF) are provided. The photonic processor includes a multiplexer configured to multiplex, using at least one photonic DOF, multiple encoded optical signals into a multiplexed optical signal. The photonic processor also includes a detector coupled to an output of an optical path including the multiplexer, the detector being configured to generate a first current based on the multiplexed optical signal or a demultiplexed portion of the multiplexed optical signal. The photonic processor further includes a modulator coupled to and output of the detector, the modulator being configured to generate a second current by modulating the first current.

A dual-polarization (DP) intensity-modulated direct detection (IMDD) receiver includes: an input port configured to receive input light; an optical 2×2 multi-input-multi-output (MIMO) demultiplexer configured to receive light from a first optical transmission path and a second optical transmission path and perform optical 2×2 MIMO polarization demultiplexing; a pair of photodetectors configured to detect outputs at a common carrier frequency; and an electrical 2×2 MIMO demultiplexer configured to receive a signal from the first electrical transmission path and a signal from the second electrical transmission path and perform electrical 2×2 MIMO polarization demultiplexing to output a first demultiplexed signal and a second demultiplexed signal.

An optical transceiving module is provided, including a housing, a circuit board, a bidirectional optical interface, a circulator assembly, an optical transmission assembly, a wavelength division multiplexing assembly, an optical reception assembly and a wavelength division demultiplexing assembly that are disposed in the housing. The optical transmission assembly and the optical reception assembly are electrically connected to the circuit board. The bidirectional optical interface is used for the transmission of combined optical signals. The circulator assembly includes a public optical port, an optical egress port, and an optical ingress port. The optical transmission assembly transmits at least eight transmission-end optical signals. The wavelength division multiplexing assembly combines at least eight transmission-end optical signals, and transmits combined optical signal to the optical ingress port. The wavelength division demultiplexing assembly is to demultiplex the combined optical signal. The optical reception assembly receives at least eight reception-end optical signals.

The invention relates to the technical field of optical fiber communication, and particularly discloses a polarization demultiplexing method and system based on rotation angle and phase delay estimation of a Stokes space, and the method comprises the steps: obtaining two polarization multiplexing signals which are transmitted through an optical fiber and are transmitted on the same wavelength, dividing the two paths of polarization multiplexing signals into a first optical signal and a second optical signal according to a preset proportion; based on the first optical signal, calculating a rotation angle and phase delay by using a digital signal processing algorithm, and obtaining a corresponding control voltage according to the calculated rotation angle and phase delay; adjusting an arranged polarization control panel by using the obtained control voltage, so that two paths of polarization multiplexing signals of a second optical signal part are separated after the second optical signal passes through the polarization control panel; and demodulating the second optical signal passing through the polarization control board to obtain two independent paths of output optical signals which are respectively demodulated by two direct detection receivers.

Various example embodiments supporting optical communications in an optical communication system may be configured to support joint stimulated Brillouin scattering (SBS) suppression and polarization tracking for a set of orthogonal polarization optical channels in an intensity modulated / direct detection (IM / DD) passive optical network (PON). Various example embodiments may be configured to support joint SBS suppression and polarization tracking for a set of orthogonal polarization optical channels based on a set of frequency tones (e.g., using a single frequency tone per optical channel in the set of orthogonal polarization optical channels, respectively) such that SBS suppression is supported for transmissions from the transmitter (e.g., based on application of the frequency tones to the optical channels) and polarization tracking is supported at the receiver (e.g., based on use of one or more of the frequency tones of the optical channels in the set of orthogonal polarization optical channels for polarization tracking).

A 2×2 optical multi-input-multi-output (MIMO) demultiplexer is disclosed. A first optical phase shifter applies a first relative phase shift between a first pair of optical transmission paths that are received from MIMO inputs, and a first 2×2 optical coupler combines the first pair of optical transmission paths and outputs a second pair of optical transmission paths. A second optical phase shifter applies a second relative phase shift between the second pair of optical transmission paths, and a second 2×2 optical coupler combines the second pair of optical transmission paths and outputs a third pair of optical transmission paths. A third optical phase shifter applies a third relative phase shift between the third pair of optical transmission paths, and a third 2×2 optical coupler combines the third pair of optical transmission paths and outputs a fourth pair of optical transmission paths, which are output by a pair of MIMO outputs.

The present disclosure describes an optical system and method of operating the optical system. The optical system includes a substrate and first and second photonic integrated circuits. The first photonic integrated circuit is positioned on the substrate. The second photonic integrated circuit is positioned on the first photonic integrated circuit. The second photonic integrated circuit receives a first optical signal that includes a first mode and a second mode. The second photonic integrated circuit includes a polarization splitter rotator, a first demultiplexer, and a second demultiplexer. The polarization splitter rotator separates the first optical signal into a second optical with the first mode and a third optical signal with the first mode. The first and second demultiplexers separate the second and third optical signals into first and second pluralities of optical signals. The first and second pluralities of optical signals couple into the first photonic integrated circuit.

A communication network includes a coherent optics transmitter, a coherent optics receiver, an optical transport medium operably coupling the coherent optics transmitter to the coherent optics receiver, and a coherent optics interface. The coherent optics interface includes a lineside interface portion, a clientside interface portion, and a control interface portion.

A digital filter (6) performs polarization variation compensation for data of at least two polarizations in which a plurality of known signals are inserted at predetermined positions in each frame by means of a filter in which a tap coefficient is set. Before a frame synchronization unit (4a) generates a frame signal from an output signal of a digital filter, a tap coefficient update circuit (7) updates the tap coefficient such that the difference between the amplitude value of the data and the amplitude value that the data should take is small. After a frame signal is generated, a tap coefficient updating circuit (7) receives the frame signal in a feedback manner, detects a known signal from the data on the basis of the frame signal, and updates the tap coefficient such that the difference between the detected known signal and the true value of the known signal becomes small.

A signal processing method of converting a real number component and an imaginary number component of each polarization of a sub-carrier-multiplexed and polarization-multiplexed received signal into a frequency domain signal; selecting a frequency domain signal corresponding to a sub-carrier; receiving, as input signals, a real number component and an imaginary number component of each polarization of each sub-carrier and frequency inversion and phase conjugation, performing a first equalization process of multiplying, for each sub-carrier and polarization, the real number component and the imaginary number component of each polarization included in the input signal by a complex transfer function and then adding them and performing inverse conversion from a frequency domain signal into a time domain signal and a second equalization process of performing a signal of a real number component obtained by subjecting the real number component of each polarization included in the input signal to frequency inversion and taking complex conjugation and a signal of an imaginary number component obtained by subjecting the imaginary number component to frequency inversion and taking complex conjugation by a complex transfer function and then adding them, and performing inverse conversion from a frequency domain signal into a time domain signal, and adding or subtracting the transmission data bias correction signal to or from the signal obtained by adding the first addition signal and the second addition signal.

A 2×2 optical multi-input-multi-output (MIMO) demultiplexer is disclosed. A first optical phase shifter applies a first relative phase shift between a first pair of optical transmission paths that are received from MIMO inputs, and a first 2×2 optical coupler combines the first pair of optical transmission paths and outputs a second pair of optical transmission paths. A second optical phase shifter applies a second relative phase shift between the second pair of optical transmission paths, and a second 2×2 optical coupler combines the second pair of optical transmission paths and outputs a third pair of optical transmission paths. A third optical phase shifter applies a third relative phase shift between the third pair of optical transmission paths, and a third 2×2 optical coupler combines the third pair of optical transmission paths and outputs a fourth pair of optical transmission paths, which are output by a pair of MIMO outputs.

Apparatus is provided for transmitting and / or for receiving data over a free-space optical link. An optical data transmitter generates duplicate digital data streams carrying a same digital data sequence with a relative temporal offset and mixes them onto two different polarization channels according to a preselected linear mixing rule. An optical data receiver demodulates first and second digital streams from the two polarization channels and unmixes the demodulated data, to produce first and second output digital data streams according to a preselected linear unmixing rule. The receiver applies a quality indicator to select between segments of the respective output digital data streams that correspond to the same transmitted data sequence.

This control signal multiplexer comprises a modulation unit that uses a control signal to polarize and modulate an optical signal for conveying a main signal.