94 results about "Wavelength reuse" patented technology

The invention discloses a long-distance communication optical cable fault automatic detection and positioning system and method, and the method comprises the steps: collecting optical signal data in an optical fiber link in real time through the deployment of a multi-optical fiber sensor or a distributed optical fiber sensing technology; denoising processing is carried out on the collected data, abnormal fluctuation is analyzed by applying a self-adaptive algorithm, and the type of a fault which is about to occur is identified; classifying the faults by using a machine learning classification algorithm; time domain reflection and wavelength multiplexing technologies are combined, a composite algorithm is adopted to accurately position a fault point, and path optimization and error correction are carried out through sensing node data comprehensive analysis; an environment compensation algorithm is introduced, influences of environment factors on the optical signals are analyzed in real time, and errors are eliminated; and based on a fault positioning and analysis result, an AI algorithm is adopted to evaluate a fault influence range, a repair scheme is automatically generated, and priorities are scheduled for repair.

The invention relates to the technical field of quantum key distribution, in particular to a quantum key distribution device and method based on soliton optical combs. A soliton optical comb chip is used as a light source, the light source enters a quantum key coding chip, quantum state coding is achieved after pulse light generation, wavelength multiplexing, multi-quantum key protocol coding and light attenuation, and the light source is input to a multi-wavelength multi-path optical switching chip for path selection. After passing through the optical fiber channel, the signal light is input into the quantum key decoding chip to be decoded and detected. According to the invention, multiple users can use different protocols to carry out quantum key distribution, quantum states carrying different coding modes carry out quantum communication with different communication parties based on wavelength decoupling, and construction of a quantum communication network can be supported.

A branching / coupling device is provided with: first to third optical transmission paths; a first multi / demultiplexer that outputs a first optical signal based on the wavelength-multiplexed optical signals inputted from the second and third optical transmission paths, outputs a second optical signal based on the wavelength-multiplexed optical signals inputted from the first and third optical transmission paths, and outputs a third optical signal based on the wavelength-multiplexed optical signals inputted from the first and second optical transmission paths; a second multi / demultiplexer that outputs one of the first to third optical signals based on the wavelength-multiplexed optical signals; an optical splitter that distributes the wavelength-multiplexed optical signals to the first and second multi / demultiplexer; and an optical switch that selects either the first to third optical signals generated in the first multi / demultiplexer or the second multi / demultiplexer, and outputs the selected optical signals to the output destinations.

A system for a waveguide-based diplexer (wavelength multiplexer / demultiplexer) and polarizer having ultra-broad bandwidth, a compact footprint, low losses, fabrication robustness and a simple single etch fabrication process. The polarizer (TE-pass) is based on the phase-matched coupling of the unwanted TM0 mode in an input waveguide to the TM1 mode in a tapered directional coupler (DC), which is then guided through a low-loss bend (180-degree) and scattered in a terminator section with low back reflections. An S-bend is added before the output for filtering any residual TM0mode present in the input waveguide. The diplexer is based on a multimode interference (MMI) coupler and is designed at the first imaging length for 1550 nm wavelength resulting in a compact MMI length. In order to improve the extinction ratio, the output ports are made asymmetric in width.

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.

An optical integrated chip (70A,70B,70C) integrated with a silicon substrate(s) includes a wavelength multiplexer / demultiplexer (72A,72B,72C), a first light guiding element (74), and a plurality of second light guiding elements (76,78). The wavelength multiplexer / demultiplexer (72A,72B,72C) has a first and a second optical coupling regions (C1,C2) opposite to each other. The first light guiding element (74) is optically coupled to the wavelength multiplexer / demultiplexer (72A,72B,72C) through the first optical coupling region (C1) thereof. The plurality of second light guiding elements (76,78) optically coupled to the wavelength multiplexer / demultiplexer (72A,72B,72C) through the second optical coupling region (C2) thereof. In addition, a high resolution low-cost integrated handheld miniature spectrometer system is also provided.

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.

An aim is to provide an optical communication system and an optical communication method for transmitting a wavelength-multiplexed signal whose signal quality on a reception side is adjusted to desired quality. A first optical transmitter outputs a first optical signal of a first wavelength at a first transmission intensity. A second optical transmitter outputs a second optical signal of a second wavelength longer than the first wavelength at a second transmission intensity lower than the first transmission intensity. A multiplexer outputs a third optical signal obtained by multiplexing the first optical signal and the second optical signal to an optical transmission line. The intensity of the first optical signal transmitted through the optical transmission line is reduced by inter-signal stimulated Raman scattering. The second optical signal transmitted through the optical transmission line is amplified by the inter-signal stimulated Raman scattering of the first optical signal.

The present invention provides a high spatio-temporal resolution imaging system and imaging method based on wavelength multiplexing, which are used to solve the technical problems existing in the existing imaging technology based on high-speed framing cameras, such as the decrease in imaging resolution, large electronic noise, or the problems existing in the serial laser shadow active imaging technology, such as the inconsistency of the field of view between multiple frames, the easy mutual interference between imaging frames, and the low anti-interference ability and stability of the system. The high spatio-temporal resolution imaging system based on wavelength multiplexing of the present invention couples the pulsed lasers emitted by multiple high-energy nanosecond pulsed lasers with different wavelengths through multiple dichroic mirrors, enables the multiple pulsed lasers to propagate on the same optical path, forms a composite pulse sequence and then irradiates the target to be measured, ensuring the consistency of the imaging field of view; at the same time, each detector can only receive the imaging light pulse with a corresponding wavelength through the beam splitting module and the corresponding narrowband filter, realizing the wavelength multiplexing of the imaging light pulses.

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.

An optical wavelength multiplexing transmission device includes: a demultiplexer configured to demultiplex a wavelength multiplexing signal for each wavelength band from a multiplexed signal that includes wavelength multiplexing signals in a plurality of the wavelength bands; a processor configured to detect an optical power value of each wavelength multiplexing signal for each wavelength band; calculate a compensation amount used to compensate a tilt of the wavelength multiplexing signal, by using the optical power value and a predetermined calculation expression; and compensate the tilt of the wavelength multiplexing signal, based on the compensation amount; and a multiplexer configured to multiplex each wavelength multiplexing signal compensated by the processor and output the wavelength multiplexing signal to a transmission line.

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.

The present application provides a light splitting device and an optical network system. The light splitting device comprises a wavelength division device, an optical switch, a wave combining device, and at least one output port. The wavelength division device is used for receiving a first signal and demultiplexing the first signal to obtain a first protocol signal and a second protocol signal, and optical communication protocols used by the first protocol signal and the second protocol signal are different. The optical switch is used for receiving a second protocol signal and dividing the second protocol signal into a second signal and a third signal, and the second signal and the third signal are different in the time domain. The wave combining device is used for receiving the first protocol signal and the second signal and performing wavelength multiplexing on the first protocol signal and the second signal to generate a fourth signal. The at least one output port is used for outputting the third signal and the fourth signal. The number of ONUs accessed by an OLT is increased, and the requirement for rapid increase of the number of access users of an optical access network is met on the premise of ensuring that services of different protocols are not interfered.

This network designing device comprises a calculation part. On the basis of information on nodes and links constituting a network for performing wavelength multiplex communication, the number of wavelengths transmittable through a transmission path for transmitting a signal of a link, a plurality of types of paths represented by a link from a start point node to an end point node, and a set of node pairs of a start point node and an end point node for performing communication, the calculation part calculates a link for use in transmitting a signal of the set of node pairs so as to reduce the number of transmission paths that are used, under conditions in which the nodes perform signal switching for transmission path units, a spare path and a main path for transmitting signals of the same node pair do not include the same link, and a plurality of spare paths in which the corresponding main paths do not share a link can use the same resource.

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.

This optical communication system comprises: K (where K is an integer greater than 1) optical switches having a plurality of first ports and a plurality of second ports; and a plurality of wavelength multiplexers / demultiplexers connected to the second ports of the optical switches. The wavelength multiplexers / demultiplexers each have one third port connected to an optical switch and K fourth ports supporting different wavelengths. The K fourth ports of the wavelength multiplexer / demultiplexer are connected to the fourth ports of K other wavelength multiplexers / demultiplexers connected to the K optical switches. The connected fourth ports support the same wavelength. The optical switches each output, from the second port, an optical signal input from the first port, and output, from the first port, an optical signal input from the second port. The wavelength multiplexers / demultiplexers each output an optical signal input from the third port to a fourth port according to the wavelength, and outputs, from the third port, an optical signal input from a fourth port.

The present invention belongs to the field of micro-nano optical technology, and relates to a wavelength multiplexing metasurface and design method for snapshot HiLo optical sectioning microscopic imaging, comprising the following steps: Step 1: Determine the relationship curves between the transmission phase and the transmission phase difference under the two working wavelengths of uniform illumination light and structured illumination light and the structural parameters of dielectric nanocolumns, and establish a basic unit structure phase library; Step 2: Determine the target phase difference between the uniform illumination light and the structured illumination light; Step 3: Screen the dielectric nanocolumns with equal target phase difference under the two working wavelengths in the basic structure unit library; Arrange the two screened dielectric nanocolumns according to the designed phase distribution equation to obtain a wavelength multiplexing metasurface structure. Compared with conventional HiLo microscopic imaging technology, the present invention effectively improves the imaging speed and imaging stability, reduces the complexity of the imaging and reconstruction process, and provides a new idea for snapshot HiLo microscopic imaging.

A first WSS performs demultiplexes a first wavelength-multiplexed optical signal, outputs part of the wavelengths to a first path, and outputs a remaining wavelength to a second path. A first spectrum analyzer observes a spectrum of a first optical signal included in the first wavelength-multiplexed optical signal and a spectrum of a second optical signal output from the first WSS and outputs a first observational result. A second WSS outputs a second wavelength-multiplexed optical signal obtained by multiplexing an optical signal input from a third path to an optical signal of the remaining wavelength input from the second path. A second spectrum analyzer observes a spectrum of a third optical signal included in the optical signal input to the second WSS from the second path and a spectrum of a fourth optical signal output from the second WSS, and outputs a second observational result.

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.　

A control unit (41) controls, by using bias voltage (Vb), the optical path difference between two optical paths (3, 4) included in one or more Mach‐Zehnder interferometers (MZI) included in an optical circuit (100). A reference light generation unit (35) generates reference light (λ1, λ2-λN) having N types of wavelengths different from the wavelength of signal light (λ). A reference light input unit (8) performs wavelength multiplexing of the N types of reference light (λ1, λ2-λN) on the signal light (λ) and inputs the resulting light into the optical circuit (100). An optical power monitor (53) monitors the light intensities of the N types of reference light (λ1, λ2-λN) propagated through the Mach‐Zehnder interferometers (MZI) in the optical circuit (100). A normalization unit normalizes monitoring results on the light intensities of the N types of reference light (λ1, λ2-λN). Specifically, the normalization unit performs the normalization so that: when all the optical path differences are optimal, the norm of reference light vectors having the N types of normalized monitoring results as the component thereof becomes zero; and as at least one optical path difference deviates from the optimal value, the norm becomes greater. The control unit (41) changes the bias voltage in such a manner that the norm of the reference light vectors approaches zero.

Provided is an optical wavelength conversion cross-connect device (100, 100A) in which an input path and an output path are connected, the optical wavelength conversion cross-connect device (100, 100A) including: an optical cross-connect device (OXC) (10) that switches wavelength-multiplexed signal light, obtained by multiplexing each optical signal of a plurality of wavelength bands input from the input path, for each path by using a WSS, and outputs the wavelength-multiplexed signal light to the output path; and a wavelength conversion function unit (110) that converts the wavelength of the wavelength-multiplexed signal light of which the path is switched by the optical cross-connect device (OXC) (10). An optical network system (1000) includes an optical wavelength conversion cross-connect device (100, 100A) that is connected as a relay node of an optical signal to an optical fiber of a path combining a plurality of optical fibers into a single path.

The invention discloses a DMD-based wavelength multiplexing dual-channel dynamic information encryption device and encryption method. The device comprises a light beam preprocessing module, a pseudo-color image generation module, a beam splitter and a ciphertext image generation module. The method comprises the following steps: respectively carrying out light beam preprocessing on a red laser signal and a blue laser signal, and outputting parallel emergent laser signals with two wavelengths; modulation and Fourier transform processing are carried out according to the parallel emergent laser signals with the two wavelengths, and a dual-channel pseudo-color ciphertext image is generated; performing beam splitting processing on the dual-channel pseudo-color ciphertext image to obtain a dual-channel pseudo-color ciphertext image; a dual-channel pseudo-color ciphertext image is collected, and a dual-channel optical ciphertext image and a Fourier leaf surface are generated. According to the invention, parallel encryption of a plurality of optical channels can be realized, and the encryption efficiency and security of information are remarkably improved. The DMD-based wavelength multiplexing dual-channel dynamic information encryption device and the DMD-based wavelength multiplexing dual-channel dynamic information encryption method can be widely applied to the technical field of information encryption security.

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.