118 results about "Polarization multiplexed" patented technology

The invention discloses a design method for a metasurface non-staggered polarization multiplexing holographic display device, and the method comprises the steps: carrying out the phase analysis of an initial polarization detection signal according to a phase recovery algorithm, and obtaining phase analysis information; receiving an incident polarized light signal and an emergent polarized light signal to construct emergent light complex amplitude, and combining phase analysis information to obtain analysis parameters corresponding to all positions in the metasurface device; constructing corresponding structure-phase delay mapping according to scanning information obtained by scanning, and further performing matching mapping on the analysis parameters to obtain corresponding mapping information; according to the mapping information, microstructure geometric parameters of all positions in the metasurface device are restored, and metasurface device design information is obtained. According to the design method, the holographic display device capable of carrying out independent phase regulation and control on any three polarization states can be designed, and the limitation that a non-staggered metasurface can only aim at orthogonal polarization state regulation and control is broken through; moreover, high-spatial-resolution display imaging can be realized, and the imaging field angle is larger.

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

The invention discloses a wavelength and polarization multiplexing super-structure lens construction method based on a double-layer geometric phase, and provides a double-layer geometric phase super-structure surface theoretical model by using a super-structure based on an artificial micro-nano structure, and designs a lens structure of which two working wavelengths and two polarization modes can be regulated and controlled at will by using the model. The working principle of the double-layer geometric phase super-structure lens is elaborated; secondly, optimizing and screening unit structures of the single-layer super-structure lens, establishing a unit structure database, and designing a double-layer super-unit structure on the basis of the unit structures; and finally, a double-layer super-structure lens is constructed by using a super-unit structure, so that the double-layer super-structure lens works at two wavelengths and two polarization states, and the adjustable multifunctional characteristics of dual-wavelength switchability and polarization sensitivity are realized. The method has important application prospects in the fields of dual-wavelength polarization sensitive imaging, optical tomography, sensing, new energy automobile display systems, AR / MR display and the like.

The application discloses a 3D printing multi-sector multifunctional metasurface and a design method thereof. The multi-sector multifunctional metasurface is designed based on five polarization multiplexing multifunctional metasurfaces with different phase control means, then the five metasurfaces are respectively faced to five different directions in space and integrated by using a 3D printing technology, and a multi-sector metasurface is formed. Finally, the designed multi-sector metasurface can integrate different electromagnetic functions in five directions in a 3D space. The application designs a polarization multi-sector metasurface based on the 3D printing technology. The polarization multi-sector metasurface can integrate electromagnetic functions of non-common polarization waves on a single device, and can complete wave front control in multiple directions in space, so that the electromagnetic wave control range is expanded from only transmission and reflection to multi-direction control, and the information capacity of the electromagnetic device and the space utilization rate of the wave front control are greatly improved.

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 present application relates to the field of optical communication technology, in particular to a dynamic correction method of an adaptive polarization beam combination chip applied to an optical interconnection interface, comprising the following steps: S101, acquiring the group velocities of optical signals of a first optical path and a second optical path respectively, and transmitting the optical signal with a larger group velocity to a first time delay optical path for time compensation; S102, the time delay compensated optical signal enters a first power reconstruction optical path and a second power reconstruction optical path for power adjustment; S103, the power reconstructed optical signal enters a first phase matching optical path and a second phase matching optical path for phase modulation; S104, a chip monitoring end feeds back the integrated error of the time delay, power and phase of the optical signal, and if the integrated error is greater than a set error threshold, the method returns to step S101 for re-correction. The method compensates or modulates the time delay, power ratio and phase difference, realizes high synchronization and matching of two polarization lights, and thus improves the polarization multiplexing efficiency and signal quality of the whole system.

This disclosure provides a signal processing method and system for continuous-variable quantum key distribution, relating to the field of communication technology. The method includes: up-converting two double-sideband quadrature phase-shift keying (PSK) signals to a first center frequency and a second center frequency, respectively, to form a first quantum signal in the X-polarization direction and a first quantum signal in the Y-polarization direction; adding a first pilot signal in the X-polarization direction to the first quantum signal in the X-polarization direction to obtain a first optical signal in the X-polarization direction; adding a first pilot signal in the Y-polarization direction to the first quantum signal in the Y-polarization direction to obtain a first optical signal in the Y-polarization direction; using a polarization coupler to combine the first optical signal in the X-polarization direction and the first optical signal in the Y-polarization direction into a polarization multiplexed signal; and transmitting the polarization multiplexed signal to a receiver through a quantum channel. According to embodiments of this disclosure, the security key rate of continuous-variable quantum key distribution can be improved.

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.

A polarization beam splitter includes an input port, first and second output ports, and a polarization splitting region coupled between the input port and the first and second output ports. The input port is adapted to receive guided optical signals that are polarization multiplexed, including a transverse electric (TE) optical signal and a transverse magnetic (TM) optical signal. The polarization splitting region includes a pattern of at least two materials having different refractive indexes. The pattern is shaped to demultiplex the TE and TM optical signals by directing a first power majority of the TE optical signal received at the input port to the second output port via asymmetrical power splitting while directing a second power majority of the TM optical signal received at the input port to the first output port via multipath interferometry.

A light source device includes a polarization multiplexing member including first and second regions, and a light source part. The light source part includes a first light source configured to emit a first laser beam having a first peak wavelength, a second light source configured to emit a second laser beam a second peak wavelength different from the first peak wavelength, a third light source configured to emit a third laser beam having the first peak wavelength, and a fourth light source configured to emit a fourth laser beam having the second peak wavelength. The first laser beam passes through the first region. The second laser beam passes through the second region. The third laser beam is reflected by the first region. The fourth laser beam is reflected by the second region.

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.

Disclosed in the present application are an on-chip integrated wavelength division multiplexer and a photonic integrated circuit chip. The wavelength division multiplexer comprises a polarization-insensitive flat-top wavelength division multiplexing structure, wherein the flat-top wavelength division multiplexing structure has a first input waveguide group, a second input waveguide group and an output waveguide. In the flat-top wavelength division multiplexing structure, odd-even grouping is performed on central wavelengths configured for the first input waveguide group and the second input waveguide group, optical signals of different groups are respectively input into the wavelength division multiplexer in different polarization states, and on the basis of a single polarization-insensitive flat-top wavelength division multiplexing structure, two groups of multiple optical signals of different wavelengths and in different polarization states are multiplexed into one multi-wavelength and polarization multiplexed light, thereby reducing signal crosstalk between adjacent channels, simplifying the structural complexity of the wavelength division multiplexer, reducing the size of the wavelength division multiplexer, and thus facilitating an improvement in the integration level of the photonic integrated circuit chip.

The present invention belongs to the field of polarization multiplexing technology and discloses a polarization tracking method, device and storage medium, including: at the communication receiving end, calculating the current polarization rotation state speed Δφ based on the received optical signal; flexibly configuring the pilot interval ΔL currently required by the MIMO equalizer according to Δφ; Rx ; Then, determine ΔL Rx The starting point in the received signal frame is used to achieve frame synchronization; after frame synchronization, the MIMO equalizer starts from the starting point and the interval ΔL Rx The method obtains pilot signals from the signal frame to calculate update coefficients for the MIMO equalizer, and then performs butterfly filtering on the received signal to achieve polarization tracking. It also includes comparing Δφ with a threshold and, based on the comparison result, selecting either an automatic polarization controller or a MIMO equalizer for polarization tracking. The present invention allows for flexible configuration of pilot signal spacing and polarization rotation processing methods, enabling high-dynamic range polarization tracking while reducing power consumption.

Provided is a signal processing device including: a batch adaptive equalization unit configured to use a first adaptive filter to perform an equalization process of waveform distortion on each polarized digital signal obtained by performing analog-to-digital conversion on a polarization-multiplexed signal; a matrix conversion unit configured to acquire filter coefficients of the first adaptive filter from at least the batch adaptive equalization unit, and convert acquired the filter coefficients through matrix operation; a degree-of-freedom separation adaptive equalization unit configured to use a second adaptive filter including the filter coefficients converted by the matrix conversion unit to perform an equalization process of waveform distortion due to polarization state fluctuation in a transmission path on each polarized digital signal; and a switching control unit configured to select a signal equalized by the batch adaptive equalization unit or the degree-of-freedom separation adaptive equalization unit as a reception signal.

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 application discloses a kind of based on non-interacting polarization multiplexing multi-path pulse compression device and method, it is related to ultrafast laser technology and nonlinear optics field, device includes: first polarization beam splitter, Faraday rotator, second polarization beam splitter and dispersion compensation module, dispersion compensation module is used to make pulse multiple pass through same dispersion compensation element and form return pulse, return pulse is converted into polarization state orthogonal with incident state by Faraday rotator after by first polarization beam splitter output. By Faraday non-interacting coaxial architecture, pulse keeps high-efficiency polarization matching, reduces astigmatism, spatial chirp and energy loss caused by off-axis folding, and when target dispersion amount is certain, optical envelope volume is reduced, and element light aperture requirement is reduced;While pulse compression and reverse light isolation are integrated in the same magneto-optical component, reduce the number of discrete components, improve system compactness and stability.

The present application relates to the technical field of optical communication, and particularly relates to a kind of self-adapting polarization proportion's combined beam chip system.Chip system includes: polarization beam splitter rotator PSR, for the mixed polarization light of input is divided into first light path and second light path;Time delay compensation module is arranged on first time delay light path or second time delay light path;Power reconstruction module is connected with first time delay light path and second time delay light path respectively by first beam splitter;Phase matching module is connected with the output optical signal of power reconstruction module by second beam splitter;Phase matching module includes: first tuning unit and second tuning unit, and first tuning unit and second tuning unit all include phase dynamic tuning unit, and the wavelength of light output is adjusted by adjusting resonance condition, and phase modulation is realized.The system is compensated or modulated to time delay, power ratio and phase difference, to realize that two polarized light reaches high synchronization and matching before combined beam, to improve the polarization multiplexing efficiency and signal quality of system as a whole.

An optical signal processing device includes: a polarization separator that separates an input polarization multiplexed signal; an optical coupler that branches one polarization component; an optical coupler that branches another polarization component; optical filters to which the one polarization component branched by the optical coupler is input; optical filters to which the other polarization component branched by the optical coupler is input; an optical coupler that multiplexes outputs of the optical filters; an optical coupler that multiplexes outputs of the optical filters; and a tap coefficient update unit that adaptively sets tap coefficients of the optical filters to separate a polarization multiplexed signal.

One embodiment includes an optical communication channel, a first network device connected to a first end of the optical communication channel, and a second network device connected to a second end of the optical communication channel. At least one of the first network device or the second network device performs polarization tracking of packets of polarization multiplexed bidirectional communications through the optical communication channel.

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.