47 results about "Wavelength reuse" patented technology

A pump light generation unit of an optical amplifier pumping device outputs pump light with a single wavelength or a plurality of wavelengths from a plurality of output ports. A pump light multiplexing unit polarization-multiplexes or wavelength-multiplexes the plurality of pieces of pump light which has been output from the pump light generation unit. A polarization scrambler collectively polarization-scrambles the polarization-multiplexed or wavelength-multiplexed pump light which has been output from the pump light multiplexing unit and outputs the polarization-scrambled pump light to an optical waveguide for pump light. The optical waveguide for pump light inputs the pump light which has been polarization-multiplexed or wavelength-multiplexed by the pump light multiplexing unit to the pump light superimposition unit. A pump light superimposition unit multiplexes the polarization-multiplexed or wavelength-multiplexed pump light and signal light. A pump light output port superimposes the pump light on the signal light by outputting the pump light from the pump light superimposition unit to the gain medium so that the pump light propagates in the same direction as the signal light.

The invention discloses a dual-wavelength frequency doubling regulation and control method based on a PPLN waveguide, and relates to the technical field of nonlinear optics. The method comprises the following steps: constructing a PPLN waveguide model, and determining a fundamental frequency light mode and a frequency doubling light mode; calculating effective refractive indexes of the fundamental frequency light and the frequency doubling light at respective wavelengths; the polarization period is calculated according to the effective refractive index, any target polarization period is fixed, the target polarization period is configured to correspond to two different working wavelengths at the same time, and therefore dual-wavelength frequency doubling light with a specific wave crest interval is generated at the output end of the waveguide; the wave crest interval is regulated and controlled by selecting different polarization periods; according to the invention, dynamic control of dual-wavelength frequency multiplication output is realized by changing the size of a polarization period; the single waveguide can complete various optical function design ideas, and has certain value for research in related fields such as multi-wavelength lasers and wavelength multiplexing communication.

This invention discloses a simple, multifunctional, integrated 5G analog fronthaul in-band full-duplex communication method for remote units (RUs). This method primarily relates to the fields of optical communication technology and microwave technology. The system structure of the method, as shown in Figure 1 of the specification, includes a laser, downlink vector signal, electrical local oscillator signal, downlink interference signal, target signal, reference signal, 90° electrical coupler, dual-polarization quadrature phase-shift keying modulator, phase modulator, single-mode fiber, optical coupler, polarization beamsplitter, polarization beam combiner, polarization controller, polarizer, and photodetector. The remote unit (RU) uses a single phase (PM) modulator to achieve self-interference cancellation (SIC) combined with anti-fiber dispersion transmission and down-conversion, eliminating the need for bias control and additional local oscillator (LO) branches, resulting in a simple structure. At the central office (CO), the carried downlink signal and local oscillator signal are single-sideband modulated to achieve anti-fiber dispersion transmission. The RU uses wavelength reuse technology to perform PM cascaded down-conversion on the signal received from the uplink, and the SIC is moved from the RU to the CO to simplify the RU. The entire link has no optical filter and is reconfigurable.

The invention discloses a cross-scale fluorescent particle detection device and method and application, and belongs to the technical field of cell biology.Wavelength multiplexing light spots (small light spots formed by short-wavelength laser excite small particles, and large light spots formed by large-wavelength laser excite large particles) are combined with confocal configuration and a phase-locked amplification principle, and the cross-scale fluorescent particles are detected in a rectangular-section capillary tube (lt; according to the method, the size limitation of traditional flow type detection is broken through, channel blockage is avoided, and a key technical support is provided for research on a blood coagulation mechanism and tumor metastasis.

The invention may be embodied in other forms than those specifically disclosed herein without departing from itMulti-kW-class blue (400-495 nm) fiber-delivered lasers and module configurations. In embodiments, the lasers propagate laser beams having beam parameter products of <5 mm*mrad, which are used in materials processing, welding and pumping a Raman laser. In an embodiment the laser system is an integration of fiber-coupled modules, which are in turn made up of submodules. An embodiment has sub-modules having a plurality of lensed blue semiconductor gain chips with low reflectivity front facets. These are locked in wavelength with a wavelength spread of <1 nm by using volume Bragg gratings in an external cavity configuration. An embodiment has modules having of a plurality of submodules, which are combined through wavelength multiplexing with a bandwidth of <10 nm, followed by polarization beam combining. The output of each module is fiber-coupled into a low NA fiber. In an embodiment a kW-level blue laser system is realized by fiber bundling and combining multiple modules into a single output fiber.

The invention relates to a wavelength combing device and method of a multi-core optical fiber network, computer equipment, a computer readable storage medium and a computer program product. Comprising a wavelength demultiplexing layer, a port switching layer and a wavelength multiplexing layer which are sequentially connected along a signal transmission direction, the wavelength demultiplexing layer is used for receiving wavelength division multiplexing signals output by each fiber core in the multi-core optical fiber and decoupling each path of wavelength division multiplexing signals into a preset number of independent wavelength signals; the port switching layer is used for receiving the independent wavelength signals transmitted by the wavelength demultiplexing layer, and integrating the independent wavelength signals based on a crosstalk avoidance algorithm and a water injection algorithm to obtain integrated independent wavelength signals; and the wavelength multiplexing layer is used for receiving the integrated independent wavelength signals of the port switching layer, recombining the integrated independent wavelength signals into wavelength division multiplexing signals to obtain recombined wavelength division multiplexing signals, and transmitting the recombined wavelength division multiplexing signals to a wavelength switch. By adopting the method, the port cost can be greatly reduced while crosstalk is avoided.

Transmitters, receivers, systems and methods for compensating for polarization drift caused by a communications channel are provided. One or more polarization reference signal(s) or sets of polarization reference signals may be transmitted in combination with a polarized communications signal. The combination may be via wavelength or time multiplexing. Polarization measurements of the one or more polarization reference signals or sets of polarization reference signals and subsequent heterodyne detections thereof may be used for compensation of the polarization drift of the combined signals which are received. The polarization compensation may be for a State of Polarization (SOP) of a polarized communications signal such as any one polarization basis. The polarization compensation may be for complete polarization channel compensation such as for three different polarization basis which are mutually unbiased.

The application provides a wavelength multiplexing filtering isolation communication method, device and medium, and relates to the technical field of communication. The method comprises the following steps: adjusting a current filtering receiving parameter of a wavelength selective optical filter according to a specified wavelength dynamically allocated; the wavelength selective optical filter receives a wavelength multiplexing optical signal through the current filtering receiving parameter, so as to obtain a current filtering receiving optical signal from the wavelength multiplexing optical signal, and the wavelength multiplexing optical signal is composed of the specified wavelength optical signal through dynamic routing; obtaining a wavelength deviation between a current main wavelength of the current filtering receiving optical signal and the specified wavelength, and compensating the current filtering receiving optical signal according to the wavelength deviation to obtain the specified wavelength optical signal. The application saves resources through wavelength multiplexing, obtains accurate signals through filtering compensation, and enhances signal safety through dynamic allocation of the specified wavelength and dynamic routing.

The application discloses a multi-dimensional multiplexing modulation integrated photonic circuit of thin film lithium niobate, which comprises eight MRR type modulators, eight wavelength multiplexers based on reflective Bragg gratings, two polarization rotation beam splitters, a tapered waveguide based on a subwavelength waveguide grating and a double-polarization first-order mode multiplexer / demultiplexer. The photonic integrated circuit modulates input wavelength signals of λ0 and λ1, then wavelength multiplexes the signals by using reflective Bragg gratings with different working wavelengths, and then performs mode-polarization multiplexing, so as to realize the functions of wavelength, mode and polarization mixed multiplexing and signal modulation. The multi-dimensional multiplexing modulation integrated photonic circuit has the expandable characteristics of channels, and is expected to be used in optical interconnection to realize super-large capacity data transmission in an optical network.

A kind of photonic analog-digital conversion method based on wavelength multiplexing and optical capture, utilizes wavelength division multiplexer to compound N different wavelength continuous light into a road, simultaneously loads sampled analog signal on N light paths, then makes analog signal on different wavelength light path obtain different delay amount by delay control module, and the delay amount difference of adjacent two paths is equal, and utilizes optical capture unit to realize time domain discretization of N equal time interval analog signals.The present application effectively reduces the complexity and link loss of system, improves stability, doubles the sampling rate of photonic analog-digital conversion system, and has the ability of easy large-scale expansion.Based on the method, high-speed and high-precision on-chip photonic analog-digital conversion system can be realized.

A wavelength multiplexing device according to the present disclosure includes a wavelength multiplexer for causing input light inputted from a plurality of input ports for receiving optical signals to pass within a passband determined by a set center frequency and a set bandwidth, and outputting the light from an output port; an optical monitor for measuring optical power of the optical signals for each optical frequency and generating optical waveform information; a calculator for calculating a main signal center frequency which is the center frequency of the optical signals and a main signal bandwidth which is the bandwidth of the optical signals; and a controller for setting the set center frequency to the main signal center frequency and setting the set bandwidth to the main signal bandwidth.

Provided is an optical node device comprising: a plurality of ports to which one or more communication devices that perform one-core bidirectional transmission or two-core transmission are connected; and one or more transceivers that are connected to at least one port via at least one first wavelength multiplexing / demultiplexing unit that multiplexes or demultiplexes an optical signal that has been inputted, and transmit and receive control signal light to and from the one or more communication devices. The one or more transceivers comprise: one or more receivers that receive uplink control signal light transmitted from the one or more communication devices and output the uplink control signal light to a control device; one or more transmitters that transmit downlink control signal light addressed to one or more of the communication devices; and one or more second wavelength multiplexing / demultiplexing units that output, to one or more receivers, uplink control signal light input via at least one connected first wavelength multiplexing / demultiplexing unit, and output, to at least one connected first wavelength multiplexing / demultiplexing unit, downlink control signal light transmitted from one or more of the transmitters.　

An optical integrated circuit includes wavelength multiplexing / demultiplexing elements. Each wavelength multiplexing / demultiplexing element includes a directional coupler and a delay line. The wavelength multiplexing / demultiplexing elements are connected to each other in a cascade-like manner in multiple stages.

An optical reception device includes: an optical demultiplexer that has an input port and output ports, and configured to demultiplex a wavelength-multiplexed signal light input from the input port into a signal light for each wavelength and output the signal light from each of the output ports; a multi-wavelength light output circuit configured to output a wavelength light for each wavelength included in the wavelength-multiplexed signal light to the input port of the optical demultiplexer; and a processor configured to control the optical demultiplexer and the multi-wavelength light output circuit, wherein the optical demultiplexer includes symmetric Mach-Zehnder interferometers that each have a pair of arms of different lengths, and adjustors respectively that adjust optical phases in the asymmetric Mach-Zehnder interferometers, the asymmetric Mach-Zehnder interferometers are connected to each other in a tree-like shape so as to connect the input port and the output ports.

The application discloses a wavelength multiplexing metasurface structure and an optical imaging system. The wavelength multiplexing metasurface structure has a first working mode and a second working mode. In the first working mode, a light source irradiates a sample and transmits to the wavelength multiplexing metasurface structure. First incident light transmitted to the wavelength multiplexing metasurface structure has a first wavelength. The wavelength multiplexing metasurface structure performs wavefront regulation on the first incident light to form a first light beam. In the second working mode, the light source irradiates the sample and transmits to the wavelength multiplexing metasurface structure. Second incident light transmitted to the wavelength multiplexing metasurface structure has a second wavelength. The wavelength multiplexing metasurface structure performs wavefront regulation on the second incident light to form a second light beam. The first wavelength is not equal to the second wavelength. The wavelength multiplexing metasurface structure can independently generate the first light beam and the second light beam in the first working mode and the second working mode, respectively, and effectively reduces crosstalk between the first light beam and the second light beam.

A system including wavelength multiplexers. In some embodiments, the system includes: a first multiplexing element, having a first plurality of input waveguides, each configured to receive light at a respective wavelength of a first plurality of wavelengths; and a second multiplexing element, having a second plurality of input waveguides, each configured to receive light at a respective wavelength of a second plurality of wavelengths. A wavelength of the second plurality of wavelengths may fall between a first wavelength of the first plurality of wavelengths and a second wavelength of the first plurality of wavelengths.

The invention relates to the technical field of optical communication, and provides a CPO silicon optical engine, which comprises an optical emission assembly, the optical emission assembly comprises a wavelength demultiplexer, a micro-ring modulator array and a wavelength multiplexer, the wavelength demultiplexer is used for dividing an incident multi-wavelength light beam into multiple paths of light beams with single mode length, the micro-ring modulator array is used for dividing the light beams with single mode length into multiple paths of light beams with single mode length, and the wavelength multiplexer is used for dividing the light beams with single mode length into multiple paths of light beams with single mode length. And the micro-ring modulator array is used for carrying out electro-optical signal modulation on the light subjected to beam splitting by the wavelength demultiplexer, and the wavelength multiplexer is used for combining multiple paths of light beams with different wavelengths modulated by the micro-ring modulator array into one path of multi-wavelength light beam and outputting the multi-wavelength light beam. According to the CPO silicon optical engine, high integration of a modulation channel array is realized by adopting a micro-ring modulator, on-chip receiving end integration is realized by adopting a polarization demultiplexing scheme, channels are combined by adopting a wavelength multiplexer based on a cascade multimode Bragg grating filter, the number of optical IO ports is reduced, the single-fiber transmission bandwidth is increased, an external light source scheme is adopted, and the CPO silicon optical engine has the advantages of high integration degree, high integration degree and high integration degree. The occupied space is reduced, and the heat dissipation pressure is reduced.

An optical transmission apparatus that transmits an optical signal between a communication terminal device and a network without converting the optical signal into an electrical signal includes: a plurality of multiplexing / demultiplexing units configured to receive and output optical signals from and to the communication terminal device connected to the optical transmission apparatus; a plurality of wavelength multiplexing / separating units configured to receive and output optical signals from and to the network connected to the optical transmission apparatus; and an optical distribution unit configured to output optical signals output from the multiplexing / demultiplexing units and subjected to predetermined electrical processing to a predetermined multiplexing / demultiplexing unit.

The embodiment of the invention provides an optical computing chip, and relates to the technical field of optics and the technical field of optical computing. The optical calculation chip comprises an angular momentum generating device used for generating a plurality of angular momentum light beams with different topological charges, and the angular momentum light beams comprise a spin angular momentum light beam and an orbital angular momentum light beam; and the first metasurface device is used for converting the angular momentum light beam into a vector focusing light beam and realizing regulation and control of three components of an electric field and spatial intensity distribution thereof. According to the optical calculation chip provided by the embodiment of the invention, a plurality of different angular momentum light beams are generated through the angular momentum generation device, so that multi-channel parallel logic operation, additive calculation and machine learning reasoning are realized through a combination mode of angular momentum multiplexing, polarization multiplexing and / or wavelength multiplexing; therefore, the optical calculation process can be suitable for more complex logic processing, that is, higher-density logic processing is realized.

Provided is a communication device that performs wavelength division multiplexing communication with a counterpart device that is a communication partner. The communication device comprises: a wavelength arrangement determination unit that determines a plurality of wavelengths to be used for communication with the counterpart device on the basis of a wavelength arrangement determined so as not to overlap a frequency position of idler light generated by four-wave mixing and an estimate value of the zero dispersion wavelength of a communication path connected to the counterpart device; a plurality of transmitters that transmit the light of the plurality of wavelengths determined by the wavelength arrangement determination unit; and a multiplexing unit that wavelength-multiplexes and outputs the light of the plurality of wavelengths outputted from each of the plurality of transmitters.　

A system including an optical transmitter. In some embodiments, the system includes: a first array of lasers; a first wavelength multiplexer, connected to the first array of lasers; a first coupler, connected to the wavelength multiplexer; and a first wavelength meter, connected to a first output of the first coupler.

This technology provides the ability to photomultiply and demultiply unpolarized incident light using a single array waveguide diffraction grating. [Solution] The array waveguide diffraction grating 1 formed on the substrate 10 comprises a first slab waveguide 11, a second slab waveguide 12, an array waveguide 13 provided between the first slab waveguide 11 and the second slab waveguide 12, one input waveguide 211 into which wavelength-multiplexed light is input and a plurality of output waveguides 221 into which the wavelength-multiplexed light is demultiplexed and output for each wavelength, connected to the end of the first slab waveguide 11 opposite to the array waveguide 13, and one input waveguide 212 into which wavelength-multiplexed light is input and a plurality of output waveguides 222 into which the wavelength-multiplexed light is demultiplexed and output for each wavelength, connected to the end of the second slab waveguide 12 opposite to the array waveguide 13.

The invention relates to the technical field of wavelength division transmission, in particular to a wavelength division transmission method, system and equipment, and the method comprises the following steps: obtaining to-be-scheduled path nodes and wavelength numbers, collecting channel distribution records and available intervals, screening continuous available wavelength numbers, calculating the maximum continuous occupied time, and screening path combinations. And extracting a hop count and consistent wavelength serial number sorting path, calculating the occupancy frequency, comparing the occupancy frequency with a threshold value, judging a frequency state, and adjusting a multiplexing frequency to generate a scheduling scheme. In the invention, the continuous available state of the wavelength among the multi-hop nodes in the link is identified, the consistency allocation of path resources is realized, the wavelength switching loss is reduced, matching is carried out in combination with the transmission duration and the wavelength occupation time, the resource time sequence conflict is avoided, optimal sorting is carried out based on the hop count and the wavelength use condition, and the path scheduling efficiency is improved; the wavelength multiplexing heat is dynamically evaluated, and the frequency configuration is adjusted, so that the resource allocation is more balanced, and the link stability and the scheduling flexibility are enhanced.

This optical communication system comprises a first conversion unit, a multiplexing unit, a separation unit, and a second conversion unit. The first conversion unit converts a first signal of a high-priority first user into a first optical signal having a first wavelength shorter than a predetermined wavelength, and converts a second signal of a low-priority second user into a second optical signal having a second wavelength longer than the first wavelength. The multiplexing unit wavelength-multiplexes the first optical signal and the second optical signal and outputs the wavelength-multiplexed signals to an optical transmission line. The separation unit performs wavelength separation on the first optical signal and the second optical signal transmitted through the optical transmission line. The second conversion unit converts the separated first optical signal into a third signal and outputs the third signal to an output destination corresponding to a communication destination of the first user, and converts the separated second optical signal into a fourth signal and outputs the fourth signal to an output destination corresponding to a communication destination of the second user.

The application discloses a time delay compensation method of a terahertz optical fiber communication system and belongs to the technical field of access communication. The application introduces an optical true time delay compensation network between digital precoding and analog precoding of a hybrid precoding structure. Uniform optical carriers generated by an optical comb wave generator are used for wavelength mapping, and then the properties of a dispersion medium are used to generate different time delays for different wavelengths to form a beam compensation mode. By introducing an optimal beam compensation mode in a radio frequency chain, the beams are aligned with the target direction at all frequencies, and the beam splitting effect is solved. By using passive wavelength multiplexers and wavelength demultiplexers, the application greatly reduces power consumption and deployment complexity. The beam compensation mode provided by the optical true time delay compensation network changes the signal time delay, and the time delay compensation can realize different phases for different frequencies to compensate the beam splitting effect. Different precision compensation can be provided according to actual deployment needs to match different application scenarios.

The invention relates to a wavelength hard isolation method, which comprises the steps of planning a wavelength allocation scheme of each safety partition, and determining the number of wavelength channels and a waveband allocation strategy based on a power grid network topology structure, a transmission distance range and an expected capacity demand; a wavelength routing strategy of the OLT equipment is configured, and wavelength sets of different security partitions are multiplexed to single fiber transmission through a wavelength multiplexer; oNU terminal devices are configured, each ONU terminal device is provided with a wavelength selective optical filter in advance, and only the specified wavelength of the corresponding security partition is received; and verifying the physical isolation performance of each wavelength channel to ensure that the power grid security partition requirement is met. Different wavelength routing strategies are configured on OLT equipment, a wavelength selective optical filter is preset on ONU terminal equipment, only specified wavelengths of corresponding safety partitions are received, hard isolation of different areas according to the wavelengths is achieved, and safety protection regulations of an electric power monitoring system are met.

The application discloses a long-distance communication optical cable fault automatic detection and positioning system and method, which comprises the following steps: collecting optical signal data in an optical fiber link in real time by deploying a multi-fiber sensor or a distributed optical fiber sensing technology; carrying out denoising processing on the collected data, and applying an adaptive algorithm to analyze abnormal fluctuations and identify the type of an impending fault; classifying the fault by using a machine learning classification algorithm; combining time domain reflection and wavelength multiplexing technology, and adopting a composite algorithm to accurately locate a fault point, and optimizing a path and correcting an error by comprehensively analyzing sensor node data; introducing an environmental compensation algorithm to analyze the influence of environmental factors on optical signals in real time and eliminate errors; and based on the fault positioning and analysis results, using an AI algorithm to evaluate the influence range of the fault, automatically generating a repair scheme and scheduling a priority for repair.

The application discloses a kind of based on wavelength multiplexing super surface fast three-dimensional microscopic imaging method and system, system includes: light source module, light modulation module, sample stage and light collection module are arranged along the direction of light beam propagation;The light modulation module is modulated into the sinusoidal stripe distribution structure illumination light required by HiLo microscopic imaging with phase flat uniform illumination light with double-wavelength light beam and projects illumination light to sample stage;The light collection module realizes sample image acquisition on different axial planes and data transmission;According to HiLo fusion algorithm, a plurality of optical section images are combined to form three-dimensional microscopic imaging.The application realizes the snapshot of HiLo optical section microscopic imaging, improves the imaging speed and stability;Realize the three-dimensional microscopic imaging of sample to be measured;With small volume, compact structure and the advantages such as being easy to move, can satisfy the demand of instant detection under complex environment such as field environment, remote area.