71 results about "Polarization multiplexed" 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 compensation method and device with robustness under a polarization effect, equipment and a storage medium, belongs to the technical field of communication, and solves the problem that the robustness of a communication system is affected under the existing factors such as rapid polarization state disturbance. A compensation method with robustness under a polarization effect comprises the following steps that S1, a transmitting end processing module generates a polarization multiplexing signal, and a pair of pilot frequencies is inserted in each of two polarization directions of the polarization multiplexing signal to obtain a transmitting end signal; s2, sending the sending end signal to a receiving end digital processing module through a link with a polarization effect, extracting a damage matrix at an insertion position by the receiving end digital processing module according to the pilot frequency, and calculating differential group delay and polarization loss according to a channel matrix, and constructing a damage compensation matrix and completing compensation of the link with the polarization effect. The method provided by the invention has high robustness under the condition that polarization rotation and polarization mode dispersion are damaged in a polarization state.

The invention discloses a polarization multiplexing metasurface design method and device for aspheric mirror shape and parameter simultaneous measurement, which can be used for simultaneously completing high-precision measurement of shape and parameters of an aspheric mirror in the same light path, and avoids the defects of multiple optical elements, complex and huge system, high difficulty in installation and adjustment and easiness in external interference in the traditional method. And the modulation area can be fully utilized to ensure the test resolution, and the integrated, lightweight and high-precision synchronous detection of the surface shape and the parameters is realized. The method comprises the following steps: (1) performing optical path modeling to determine a target phase; (2) carrying out target phase-based transformation; (3) establishing a metasurface unit library; (4) constructing a metasurface unit array: traversing a metasurface unit library according to the target phase after the basis transformation, and sequentially selecting unit parameters with the minimum difference between the actual phase and the target phase at each spatial position from the metasurface unit library; and (5) functional detection and optimization.

A kind of big depth of field light field near-to-eye display device and method based on polarization multiplexing.The device includes display screen, virtual image adjusting module, real image adjusting module, total controller, drive module, optional optical power compensation lens and optional diopter compensation lens.Via virtual image adjusting module and real image adjusting module respectively regulate virtual image and real world light, so that both are imaged in design distance after entering human eye, realize virtual and real confocal display;Total controller is used to generate multiple depth light field image, and according to the difference of light field image, control drive module output voltage, so as to adjust the focal length of the above two image adjusting devices;In the process of light field image switching, the voltage of drive module is synchronously adjusted.The present application can realize the clear fusion of multiple depth three-dimensional virtual image and real image by zero optical power design, has good imaging quality and visual comfort, and is suitable for augmented reality and other near-to-eye display scenarios.

The invention discloses a dual-channel optical image authentication method based on a polarization multiplexing metasurface, and the method comprises the steps: firstly, calculating an authentication phase of a dual-channel plaintext image through employing a sparse constraint-driven authentication holographic algorithm; the method comprises the following steps: firstly, obtaining a target transmission phase and a geometric phase of a polarization multiplexing metasurface according to a composite phase regulation and control principle, then carrying out parameter scanning on a basic unit of the nano-column metasurface, establishing a transmission and geometric phase database, and finally determining structural parameters of each nano-column pixel by pixel, thereby completing construction of the polarization multiplexing authentication metasurface. And an authentication step: firstly, respectively illuminating the metasurface by using left-handed circularly polarized light and right-handed circularly polarized light to obtain a far-field diffracted noise-like image, then calculating nonlinear correlation distribution of the diffracted image and a plaintext image of a corresponding channel, and judging an authentication result of each channel according to whether the signal-to-noise ratio of the nonlinear correlation distribution reaches the standard or not. The method provided by the invention has the advantages of large authentication capacity, high authentication efficiency and no plaintext information leakage.

The invention discloses a full-polarization light-splitting type super-structure surface covering a mid-infrared broadband and a method of the full-polarization light-splitting type super-structure surface. The super-structure surface is formed by periodically arranging super-structure units, each super-structure unit comprises three groups of nano-structures used for regulating and controlling different cross-polarization, each group of nano-structures respectively control a pair of cross-polarization, each group of nano-structures comprises three anisotropic nano-columns, and the nano-columns of the three groups of nano-structures are arranged in a staggered manner. According to the invention, on the basis of the structural design of space polarization multiplexing, the independent regulation and control capability of the metasurface on the phase, amplitude and polarization state of a light field is fully utilized, the metasurface with polarization selective response is constructed, and the full Stokes polarization decomposition and focusing function of the mid-infrared broadband (3-5 [mu] m) is realized at the sub-wavelength scale; incident light in different polarization states can be respectively focused to different spatial positions, so that the polarization beam splitting efficiency and the imaging quality are remarkably improved, and the application of polarization information in complex light field detection and infrared imaging is promoted.

The application discloses a thin-film lithium niobate-based electro-optic polarization modulator, characterized by comprising a first single-mode optical fiber, an input optical coupler, an electro-optic modulation phase shift region, an output double-waveguide vertical direct receiving coupler and a second single-mode optical fiber connected in sequence, wherein the modulated light enters from the first single-mode optical fiber, is coupled into the electro-optic modulation phase shift region through the input optical coupler, is coupled into the second single-mode optical fiber through the output double-waveguide vertical direct receiving coupler after being modulated in the electro-optic modulation phase shift region, and exits from the second single-mode optical fiber. The application is based on X-cut or Y-cut thin-film lithium niobate, the electric field of the electro-optic modulation region is along the Z-axis direction, the excellent electro-optic effect of lithium niobate material is effectively utilized, the electro-optic polarization modulator has the advantages of fast response speed, low driving voltage and low power consumption. Compared with the polarization multiplexing device with a length of hundreds of microns, the compactness of the structure is greatly improved, and the miniaturization of the device is facilitated.

The present application relates to a dual-comb laser, and in particular to a direction-polarization multiplexing single-cavity dual-comb laser, which solves the technical problems of the prior art that pulse components in different polarization directions are difficult to separate, leading to high difficulty in dual-polarization mode locking, harsh implementation conditions, or difficulty in adjusting the pulse repetition frequency difference, and the numerical value is small, or the mutual coherence of the output pulse sequence is low, and the signal-to-noise ratio is low. The present application adopts a full polarization maintaining optical fiber resonant cavity with a polarization beam splitter as a central node and a double-linked ring cavity structure composed of ring structure A and ring structure B. The laser transmitted in the counterclockwise direction in the ring structure A is cut off, and the laser transmitted in the clockwise direction is separated by the polarization beam splitter and transmitted in the opposite direction in the ring structure B, partially output, and partially returned to the ring structure A, thereby realizing cyclic oscillation.

The invention discloses a polarization multiplexing all-dielectric metasurface structure color device based on gallium phosphide. The device is composed of periodically arranged metasurface units, and each unit sequentially comprises a transparent quartz substrate 1, a TiO2 reflecting layer 2 and an all-dielectric nano resonator located on the TiO2 reflecting layer 2 from bottom to top. The nano resonator is composed of a GaP nano column 3 and a SiO2 impedance matching layer 4 covering the top of the GaP nano column 3. The material cost is low, the manufacturing process is mature, and the designed device shows obvious optical response difference under irradiation of different polarized lights. By utilizing the characteristics of high refractive index and low loss of a gallium phosphide material in a medium-long wave region of visible light, a single reflection peak of which the reflection efficiency is up to 99% and the bandwidth is less than 16nm is realized under X polarization of a visible light wave band; and a stable multi-peak spectrum is formed under Y polarization to serve as a spectrum fingerprint, so that high-quality display and polarization multiplexing functions are realized in the same device. The device is suitable for the fields of high-color-gamut display, optical anti-counterfeiting and the like.

The invention discloses a method and system for expanding a non-fuzzy distance based on polarization multiplexing double optical combs, and the method comprises the following steps: the polarization multiplexing double optical combs generate two groups of pulse sequences with different repetition frequencies, one part of the pulse sequences serves as local oscillator light, and the other part of the pulse sequences serves as probe light to enter a distance measurement module; the detection light is divided into two parts, the two parts enter a reference light path and a target light path respectively and then are reflected by two reflectors respectively, then the two parts and the local oscillation light are subjected to frequency beating respectively, two groups of interferograms carrying reference position information and target position information respectively are obtained, and the time interval in the two groups of interferograms is measured and combined with the repetition frequency of a double-optical-comb pulse sequence, so that the target position information is obtained. And the distance to be measured, namely the length difference between the reference light path and the target light path, can be calculated. The problem that the non-fuzzy distance of a traditional double-optical-comb system is small is solved in a simple and reliable mode, and the measurable absolute distance is increased by multiple orders of magnitude.

An optical module includes: a polarization controller that includes a main body including a polarization multiplexer and demultiplexer portion that, upon input of two kinds of light that are in perpendicularly-polarized states, performs polarization multiplexing on the two kinds of light and output polarization-multiplexed light, and upon input of light, performs polarization demultiplexing on the light and outputs two kinds of light that are in perpendicularly-polarized states, a first polarizer, a first input portion, a second input portion, a third input portion, a first output portion, and a second output portion; and an optical device configured to receive input of light via the polarization controller and output light via the polarization controller.

This invention relates to a photonic Nyquist folding receiver system based on polarization multiplexing, comprising: N The first laser and optoelectronic modulator, the second i The laser generates continuous light that enters the first... i Photoelectric modulator, number i The RF input port of the upper arm of the optoelectronic modulator is connected to a carrier signal, the first i The RF input port of the lower arm of the optoelectronic modulator is connected to a binary symbol sequence; N The output optical signals of the photoelectric modulators are coupled and input to two Mach-Zehnder modulators. These two modulators are then connected to the signal under test (SUT) and the SUT processed by a delay circuit, respectively. One output optical signal passes through a polarization rotator and becomes orthogonal to the polarization state of the other optical signal. The two signals are coupled by a polarization beam combiner to output an orthogonally polarized multiplexed optical signal. This signal is then separated by a polarization beam splitter, and the two orthogonally polarized signals are fed into two photodetectors and two low-pass filters for low-pass filtering. Finally, the original frequency of the SUT is obtained by analyzing the frequency and phase difference of the two low-frequency signals. This invention can accurately recover the frequency of the SUT with low structural complexity.

The invention relates to a four-frequency four-polarization multiplexing reflective array antenna design method, and the method comprises the steps: carrying out the ingenious design of a four-frequency four-polarization multiplexing metasurface unit and an array plane, and enabling the metasurface unit to comprise a unit which is formed in a cross dipole form and is used for a dual-linear polarization wave beam, and a unit which is formed in a rose line form and is used for a dual-circular polarization wave beam; the formed array plane has the characteristic of quadrupole decoupling compared with a pen-shaped wave beam generated by a traditional same-aperture reflective array, the defect that four polarizations in a traditional multi-frequency reflective array antenna cannot be decoupled is overcome, the designed antenna can generate pen-shaped wave beams with different polarizations in four different frequency bands, the wave beam direction can be regulated and controlled at will, and the antenna has a wide application prospect. The method has a great application prospect in the field of wireless communication.

This disclosure relates to a polarization multiplexing fringe projection three-dimensional measurement method and system with anti-reflection interference. It utilizes orthogonal polarization states as independent encoding channels to realize polarization domain multiplexing of high and low frequency fringes within a single frame. It also introduces phase demodulation logic driven by linear polarization degree. By taking advantage of the characteristic that linear polarization degree is insensitive to the reflectivity of the object surface, light intensity fluctuations and exposure dynamics, it eliminates the mirror glare interference generated by highly reflective surfaces such as metals from a physical mechanism, ensuring the integrity and accuracy of reconstructed data under extreme lighting conditions.

The application discloses a mirror suppression mixing device with in-band self-interference cancellation capability, wherein a central station comprises a signal processing module, a 90-degree electrical coupler a, a photodetector x, a photodetector y, a polarization beam splitter and an optical power amplifier; a transmission medium is a single-mode optical fiber; a remote base station comprises a laser, a polarization controller, a polarization multiplexing-double drive-Mach-Zehnder modulator, an optical filter, a receiving antenna, a transmitting antenna, a direct current source x, a direct current source y, an electrical beam splitter a and an electrical beam splitter b, an electrical beam combiner a and an electrical beam combiner b, a 90-degree electrical coupler b, a local oscillator signal generator, an electrical attenuator and an electrical delay line. The application also provides a mirror suppression mixing method with in-band self-interference cancellation capability. The application not only can play the high spectral efficiency advantage of the in-band full duplex system, but also is not affected by the dispersion-induced power periodic fading phenomenon caused by optical fiber transmission, can effectively eliminate self-interference signals under the in-band full duplex system, and can effectively suppress the mirror interference caused by the open channel reception.

The polarization multiplexing double-frequency comb laser with online polarization and mode locking belongs to the field of double-frequency comb lasers. The problems of large preparation difficulty of double-frequency comb optical system, instability of double-frequency comb output light source and uncontrollable power loss are solved. The passive mode locking is realized through the mode locker, and the circulating oscillation of the set direction of the resonant cavity is realized through the direction control component (polarization insensitive isolator or ring). Since the mode locker and the online polarizer are prepared by the side polished fiber, the preparation difficulty is small, the power loss is controllable, and the online polarizer is introduced to replace the traditional unstable polarization control. The online polarizer introduced makes the double-frequency comb more stable output. The present application is mainly used for generating stable double-frequency comb light.

The invention discloses a matrix optical switch and optical communication equipment, and relates to the technical field of optical communication. The matrix optical switch separates input light into two beams of light with the same polarization state through the first polarization separation conversion unit; the two beams of light are spatially combined through the first lens group and then jointly enter the same pixel area of the first silicon-based liquid crystal, and first-time angle modulation is completed; combining the two beams of light subjected to the first-time angle modulation again to the same pixel area of the second silicon-based liquid crystal through the polarization multiplexing unit to complete second-time angle modulation; and the two beams of light after the second angle modulation are transmitted to the second polarization separation conversion unit through the second lens group, orthogonal polarization is recovered, and the beams are combined and output. The two beams of light in the same polarization state are sequentially converged to the same pixel area corresponding to the two pieces of silicon-based liquid crystal, so that the pixel utilization rate and the number of available ports are increased.

This invention discloses a large field-of-view, high-precision sun sensor based on a polarization-multiplexed metasurface array. It includes a CMOS image sensor and a metasurface array serving as a light introducer. The metasurface array achieves field-of-view multiplexing through multiple superimposed metalens units with different deflection phases. Simultaneously, using polarization multiplexing technology, each metalens unit forms a pair of spaced dual-spots on the CMOS image sensor as a line-of-view encoding. By calculating the spacing between these dual-spots, each sub-field of view can be unambiguously identified and the global field of view synthesized, thus resolving the inherent contradiction between large field of view and high precision in traditional digital sun sensors. This invention combines the advantages of a large field of view and high precision, and its lightweight design adapts to high-density integration requirements, providing technical support for spacecraft attitude measurement.

The application discloses a metasurface holographic optimization method based on a limited super atom response library selection, belongs to the metasurface holographic field, and has the steps that a three-dimensional logarithmic probability matrix P (an element represents the logarithmic probability of a structure in a response library selected by a super atom at a grid position) is randomly initialized; a Gumbel-Softmax sampling strategy is used to generate a discrete selection matrix, an index corresponding complex amplitude response is constructed, and a complex amplitude distribution matrix of the whole metasurface is constructed; then, a differentiable wave front propagation algorithm is used to calculate a target complex amplitude distribution; multi-polarization multiplexing is supported, image superposition is realized through time multiplexing; a structural similarity constraint is introduced; a total loss value gradient relative to the probability matrix is calculated; the probability matrix is updated through a stochastic gradient descent; and finally, iteration is performed until convergence, so that a selection matrix and a directly manufacturable metasurface structure layout are obtained. The application can realize high-precision and high-efficiency polarization multiplexing metasurface holographic design.

This invention discloses an achromatic metalens based on a long depth-of-focus beam and its imaging method. The method utilizes a polarization-multiplexed metalens to generate a zero-order Bessel beam and a higher-order Bessel beam, which are used to image an object, obtaining a zero-order image and a higher-order image respectively. The higher-order image is then subtracted from the zero-order image to obtain an achromatic image of the object under test. This invention achieves a large depth of field through a conical phase and utilizes the overlapping area of ​​the depth of field within a wide wavelength band to obtain broadband imaging, realizing achromatic imaging in the visible light band. The lens size is not limited, and the area can reach the centimeter level or above. Simultaneously, image subtraction effectively eliminates image blurring caused by side lobes, significantly improving image quality.

The invention relates to the technical field of coherent modulators, and provides a coherent modulator which comprises an I-MZM, a Q-MZM and a first multimode interference device, input light passes through the I-MZM to output first modulation signal light, the input light is modulated by the Q-MZM to output second modulation signal light, and the first modulation signal light is modulated by the Q-MZM to output second modulation signal light. The first multi-mode interference device is used for optical coupling of the first modulation signal light and the second modulation signal light, and the first multi-mode interference device is further used for conducting pi / 2 phase shifting on the coupled modulation signal light. The invention further provides a polarization multiplexing coherent modulation system and a manufacturing method of the coherent modulator. According to the invention, the first multimode interference device is adopted to realize power beam combination and introduce pi / 2 phase difference at the same time, so that phase shift devices are saved, and extra loss is avoided; the optical input end and the optical output end are designed on the same side, so that optical fiber array coupling can be conveniently carried out; 3dB distribution of optical power is carried out on the input light by adopting the second multi-mode interference device, so that the output optical power can work at a 3dB bias point, and extra bias voltage is not needed.

The invention discloses a dynamically tunable reflection type polarization multiplexing terahertz metasurface, and belongs to the technical field of electromagnetic wave wavefront regulation and control devices. The existing phase gradient metasurface lacks the capability of dynamically switching working frequency points and polarization modes in the same structure. The metasurface is formed by arranging n * n units in an array mode, each unit comprises a composite metal patch layer, a dielectric substrate and a metal reflection bottom plate which are sequentially arranged from top to bottom, a metal split type opening ring and an oval cross patch which form the composite metal patch layer are coplanar, the oval cross patch completely wraps the metal split type opening ring, and the metal split type opening ring and the oval cross patch form the composite metal patch layer. The elliptical cross patch is made of a vanadium dioxide material with an insulator-metal phase change characteristic; when the vanadium dioxide is in a medium state, the metal split type split ring performs dominant response, and wavefront regulation and control on circularly polarized waves are realized at a first frequency point; and when vanadium dioxide is in a metal state, the elliptical cross patch performs dominant response, and independent wavefront regulation and control on the dual-linear polarized waves are realized at a second frequency point. The method is suitable for a terahertz communication and imaging system.

The present application relates to light needle generating device and its design method, specifically relates to a kind of multifunctional light needle generating device based on super surface and its design method, the light needle generated by existing light needle generating device is difficult to ensure high resolution and long light needle length simultaneously, and because there is obvious sidelobe effect, energy utilization is lower, and there is certain damage to non-processing area technical problem.The present application uses polarization multiplexing super surface to carry out light field regulation and control, different light field distribution can be generated when different polarized light beams are incident, and then light needle with different energy distribution direction is generated by the phase regulation and control of polarization multiplexing super surface.In the design of polarization multiplexing super surface, the initial phase value of phase plane satisfies logarithmic function distribution, the reduction of light needle full width at half maximum can be realized, the problem of low light needle resolution can be solved under the premise of ensuring light needle length;At the same time, the phase points in phase group are randomly distributed, the weak sidelobe of light needle can be realized, and high-order diffraction can be avoided.

A signal processing circuit includes a MIMO filter that performs polarization separation on a reception signal obtained by performing optical sampling reception on optical signals that are polarization multiplexed signals in parallel by using a plurality of local light beams using optical pulses, and a coefficient update unit that updates a coefficient of the MIMO filter based on periodicity based on a parallel number in the optical sampling reception.

This invention provides a method and system for simultaneous measurement of Doppler frequency shift (DFS) and angle of arrival (AOA) based on a dual-polarization-dual-electrode Mach-Zehnder modulator (Dpol-DDMZM). The Dpol-DDMZM modulates the echo signals and local oscillator signals received from two antennas in parallel onto an optical wave in OCS mode. After a 90° polarization rotation and orthogonal polarization combining, the resulting polarization-multiplexed optical wave carries the echo and local oscillator signals. These signals are then filtered out by an optical bandpass filter (OBPF) to remove the positive first-order sidebands, and demultiplexed into two optical signals by a polarization beamsplitter (PBS). These signals are then converted into photoelectric signals and differentially processed by a balanced detector (BPD). The output photocurrent contains information on the Doppler frequency shift (DFS) and angle of arrival (AOA). This scheme utilizes photocurrent phase-AOA mapping to achieve simultaneous measurement of DFS and AOA. Furthermore, the modulator operates in OCS mode, improving the measurement accuracy of DFS and AOA. The system has a simple structure and high stability.

This invention discloses a method for measuring Rydberg atoms using micro-Doppler agility under a polarization-multiplexed microwave field, belonging to the field of quantum precision measurement technology. The method includes generating a dynamic coded sequence and an interleaved coded microwave field by aperiodically pairing and jumping the microwave polarization state with the carrier frequency; acquiring the target echo signal and applying it to the Rydberg atom ensemble with a reference microwave field to generate a quantum coherent state; applying a synchronous laser pulse to acquire a time-series optical response signal; obtaining the signal's fundamental frequency, envelope spectrum, and initial phase component through time-frequency transformation and feature separation; and performing parameter mapping and synthesis to generate three-dimensional micro-motion parameters. This invention uses an aperiodically agile polarization-frequency-multiplexed microwave field for active target detection and utilizes the Rydberg atom ensemble for quantum coherent detection and optical readout of the echo signal, enabling high-sensitivity, high-precision, and high-anti-interference measurement of the target's three-dimensional micro-motion parameters.

Disclosed is a spectrometer device (110) for obtaining spectroscopy information about at least one object (112), the spectrometer device comprising: at least one detector (114) for detecting light; at least one light source (118) configured to emit light in at least one optical spectral range; at least one sample interface (120) configured to allow light emitted by the light source (118) to exit the spectrometer device (110) through the sample interface (120) and configured to allow detection light to enter the spectrometer device (110) through the sample interface (120), where the sample interface (120) comprises at least one optical element configured to receive light emitted by the light source (118) from the spectrometer device (110), the at least one optical element is configured to provide at least one internal calibration target; at least one light path (122), where the light path (122) is configured for allowing light emitted by the light source (118) to propagate to the sample interface (120) and for allowing detection light to propagate to the detector (114), where the light path (122) is further configured for allowing light emitted by the light source (118) to propagate to the internal calibration target, and for allowing a reference emission to be directed by the internal calibration target to the detector (114). The spectrometer device (110) is configured to separate the reference emission and the detection light from each other by polarization multiplexing. The spectrometer device (110) is configured for I. (138) illumination through the sample interface (120) via the at least one light path (122) with light having a first polarization to obtain at least one first detector signal associated with the detection light; iI. (140) illuminating the internal calibration target with light having a second polarization different from the first polarization via the light path (122) to obtain at least one calibration signal related to the reference emission; and III. (142) determining at least one calibration information item by using the first detector signal and the calibration signal.

The application discloses a kind of full-field dynamic three-dimensional deformation measurement method and system based on polarization multiplexing, by the polarization state of object light and reference light is adjusted to circularly polarized light and 45 ° linearly polarized light respectively, polarization CCD is used, the synchronous recording of speckle field and speckle interference phase shift field before and after the three-dimensional deformation of measured object occurs is realized.The speckle interference phase shift map recorded by the pixel of polarization direction 0 and 90 on polarization CCD is used to restore off-plane deformation, and the speckle map recorded by the pixel of polarization direction 135 is used to carry out DIC calculation and restore in-plane deformation.The problems that direct speckle map and interference phase shift map cannot be recorded synchronously and dynamic measurement demand is not easy to meet in the related technology of three-dimensional deformation dynamic measurement combining DSPI and DIC are solved.