204 results about "Single polarization" patented technology

The invention relates to a sun meridian detection and course angle real-time calculation method based on polarized light field vector characteristics, and aims to solve the problems that a traditional sun meridian detection method is easily interfered in low signal-to-noise ratio scenes such as haze and cloud layer shielding, lens distortion causes polarization angle errors, the false detection rate is high, and the calculation accuracy is high. In order to solve the problems that the real-time performance and robustness of course calculation are affected due to the fact that single polarization angle information is difficult to fully reflect the sun direction, polarization parameter calculation is carried out by utilizing a multi-channel polarization image, and the sun meridian is detected by adopting Hough transform through fisheye lens correction, bilateral filtering and candidate region screening, so that the real-time performance and robustness of course calculation are improved. And a multi-point inversion method is combined to accurately obtain a sun vector and a zenith angle and an azimuth angle thereof, and finally a course angle is calculated in real time. The problems of imaging distortion and insufficient real-time processing in the traditional sun positioning technology can be effectively solved, and a powerful navigation positioning technical guarantee is provided for the fields of unmanned aerial vehicles, autonomous navigation, polarized light navigation and the like.

The present invention relates to a real-time heading angle calculation method based on the vector characteristics of the polarized light field. Aiming at the problems of traditional solar meridian detection methods, such as being easily disturbed in low signal-to-noise ratio scenarios like haze and cloud cover, the occurrence of polarization angle errors and high false detection rates caused by lens distortion, and the difficulty of using single polarization angle information to fully reflect the solar direction, which affects the real-time performance and robustness of heading calculation. This method calculates polarization parameters by using multi-channel polarization images.

The invention relates to the technical field of radar remote sensing image processing, in particular to a single-polarization synthetic aperture radar change detection method and device.The method comprises the steps that initial single-polarization SAR images of front and back time phases are preprocessed to obtain a final image, a multi-scale feature difference chart is calculated, pseudo tags are generated through fuzzy C-means clustering, and the final image is obtained; a UNet coding and decoding structure is used as a basic framework, a double-branch convolutional neural network structure is designed, an input layer, a convolutional layer, a pooling layer, a full connection layer and an output layer are adopted to form a twin convolutional neural network, residual connection is established between an input tensor and an output tensor after network processing, a change detection model is generated, and a change detection result is obtained. And outputting a detection result of the single-polarization synthetic aperture radar by using the change detection model. Therefore, the problems of low accuracy of a change monitoring result and the like caused by the defects that the processing capacity of speckle noise in an SAR image monitoring method is limited and a static threshold segmentation method is difficult to adapt to the global situation in the prior art are solved.

The present invention relates to an antenna device and an electronic device using same, the antenna device having twice as many antennas arranged in the same area so as to be reduced in size by half and be capable of performing high power long-distance transmission. The antenna device according to the present invention comprises: a core printed circuit board having antenna circuits arranged therein; a Yagi-Uda antenna formed on a plurality of printed circuit boards arranged above the core printed circuit board, so as to transmit a single polarization signal; a monopole antenna connected to the Yagi-Uda antenna through a via; and a ground radiation unit arranged below the core printed circuit board so as to be symmetrical to the monopole antenna with respect to the core printed circuit board.

The utility model discloses an on-chip integrated wavelength division multiplexer and a photon integrated circuit chip, the wavelength division multiplexer comprises a polarization compatible flat-topped wavelength division multiplexing structure, the flat-topped wavelength division multiplexing structure is provided with a first input waveguide group, a second input waveguide group and an output waveguide, the flat-topped wavelength division multiplexing structure performs odd-even grouping on the configured central wavelengths of the first input waveguide group and the second input waveguide group, and optical signals in different groups are respectively input into the wavelength division multiplexer in different polarization states; and on the basis of a single polarization compatible flat-topped wavelength division multiplexing structure, two groups of multi-path optical signals with different wavelengths in different polarization states are multiplexed into one path of multi-wavelength-polarization multiplexing light, so that signal crosstalk between adjacent channels is reduced, the structural complexity and size of the wavelength division multiplexer are simplified, and the integration level of a photon integrated circuit chip is improved.

According to the single-fiber coupling type double-beam miniaturized high-sensitivity atom magnetometer device, pumping laser and detection laser are orthogonally coupled into a single polarization maintaining fiber through a polarization beam splitter, and miniaturization of a light source light path is achieved. Besides, the polarization maintaining optical fiber and the polarization beam splitter are adopted to combine and decouple the light beams, so that the problems that the miniaturization difficulty of the magnetometer probe is increased due to light guide of multiple collimating heads and extra noise is introduced by multiple optical fibers are avoided, and high sensitivity is realized in a small detection volume; and a great promotion effect is achieved in related detection application of high-density multi-atom magnetometer array type heart and brain magnetism.

The invention discloses a single-mode single-polarization hollow-core optical fiber applied to deep ultraviolet spectrum analysis. The single-mode single-polarization hollow-core optical fiber is sequentially provided with an outer cladding area, an inner cladding area and an air fiber core area from outside to inside. The outer cladding layer area is of a kagome type and is composed of a net-shaped periodic hole ring formed by alternately arranging circles and triangles; the inner cladding is of a three-nested anti-resonance type and is composed of a circular cladding tube and an arc-shaped cladding tube or an arc-shaped cladding tube; and the fiber core region is formed by encircling the kagome net structure of the outer cladding region and the nested anti-resonance structure of the inner cladding region. The advantages of the kagome type and nested anti-resonance type optical fibers are utilized, the characteristics of single mode, single polarization, near-zero dispersion and the like are achieved while low loss is achieved at the ultraviolet band, and the optical fiber can be used for spectral analysis at the wavelength of 210 nm.

The invention relates to a multi-polarization sparse frequency hopping signal super-resolution one-dimensional distance imaging method and system, and the method achieves the modeling of a multi-polarization channel signal into a multi-observation vector model, effectively utilizes the information of each polarization channel, and avoids the defect of multi-polarization channel fusion matching after the independent processing of a single-polarization channel. Meanwhile, sparse frequency hopping radar signal one-dimensional distance imaging is modeled as a weight atom norm minimization problem, and an alternating direction multiplier method is adopted for rapid solving, so that a dictionary matrix does not need to be established, an off-grid error is avoided, a minimum atom distance constraint is avoided, and the method has a super-Rayleigh resolution capability. It needs to be noted that the method is high in flexibility and suitable for any one or combination of multiple polarization channels in four polarization channels of HH, HV, VH and VV, the super-resolution high-quality one-dimensional range profile of a radar target can be effectively obtained, and the method has high engineering application value.

The invention relates to an intelligent detection method based on an optical fiber array, and the method comprises the steps: switching the multi-polarization-state light source input of the optical fiber array, and synchronously collecting the output polarization state parameters of each optical fiber; calculating a deviation value of the output polarization state parameter based on the polarization reference value, and when the deviation value is greater than a self-adaptive threshold value, marking the optical fiber array associated region as an abnormal region; identifying a polarization state change mode of the abnormal area, and positioning an abnormal position; generating a damage detection report through the damage confidence scoring model; according to the invention, through switching and synchronous acquisition of the multi-polarization-state light source, dynamic monitoring of the global polarization state of the optical fiber array is realized, and easy-to-omit weak signal change in single-polarization-state detection is captured; automatic marking of abnormal areas and intelligent identification and matching of polarization state change modes are achieved through comparison of the polarization deviation value and the self-adaptive threshold value, automatic classification of damage types is achieved, and the effect of improving the detection precision and reliability based on the optical fiber array is achieved.

The invention discloses a method for segmenting different strata series of stratified shale and identifying oiliness, and belongs to the field of oil-gas exploration. The invention discloses a strata division method based on XRF (X-Ray Fluorescence) mineral scanning and single polarization-fluorescence-laser confocal optical lens combined observation, which realizes accurate identification and segmentation of micron-sized strata boundaries of a layered rock core sample from different scales, and performs group component extraction on segmented independent strata. And carrying out chromatography-mass spectrometry analysis and FT-ICR MS analysis on the extracted saturated, aromatic, non-aromatic, leached and other family components. The TSF spectrum, light and heavy components, biomarker compounds, non-hydrocarbon compounds and other data obtained through the experiments are comprehensively analyzed, layering scale oiliness difference quantification and oil source comparison are achieved, and the shale oil micro-migration phenomenon is determined. The influence of the heterogeneity of the layered rock core sample on a result obtained by a traditional analysis method is overcome. According to the technology, direct evidences are provided for accurate prediction of shale oil desserts, exploration risks are reduced, and economic benefits are improved.

The utility model provides a high-integration ultra-wideband receiving and dual-polarization TR assembly. The TR assembly comprises a housing, an H polarization transmit-receive channel, a V polarization receiving channel and port assemblies connected to two sides of the housing. The H polarization transceiving channel is connected in the front cavity, the V polarization receiving channel is connected in the back cavity, the H polarization transceiving channel is used for receiving and transmitting H polarization signals, and the V polarization receiving channel is used for receiving V polarization signals. According to the utility model, ports and transmission line layout are reasonably designed, a vertical interconnection structure and a step plate technology are flexibly adopted, an ultra-wideband receiving and dual-polarization TR assembly with a doubled integration level is developed within the size of an original single-polarization TR assembly, and a receiving and dual-polarization scheme of a phased-array antenna is realized. By adopting the microwave multi-layer step plate design, the polarization isolation degree of the receiving channel is improved, the use of a glass insulator for vertical transition power supply and signal transmission is avoided, the component cost is reduced, and the subsequent assembly work is simplified.

Provided are polarization-mode controlled nonreciprocal optical waveguide devices, which are used in optical isolator and optical circulator devices. These devices offer a solution to the issues associated with traditional planar optical waveguide-based optical isolators, which are specific to a single polarization mode and result in significant optical loss. The new devices implement polarization-insensitive operation with minimal optical loss. They feature a magneto-optic (MO) film clad on one side and utilize waveguide mode converters or polarization-mode converters to guide the input light signals' mode or polarization. This reduces optical loss as the light passes through the interface between the non-MO clad region and the MO clad region and maximizes the MO effect within the MO clad region by ensuring proper polarization mode.

The invention provides a broadband tight coupling polarization conversion transmission and reflection integrated array antenna unit. An array is formed by periodically arranging a plurality of antenna units integrating transmission and reflection structures; the transmission structure comprises a cross-shaped dual-polarization receiving dipole antenna and a single-polarization radiation dipole antenna, a middle floor and a phase shift line are arranged between the two antennas, and a receiving layer and a transmitting layer of the transmission structure are formed through parallel double-line connection; the reflection structure is composed of a dipole antenna orthogonal to the receiving direction of the transmission structure, and reflection is completed through parallel double-wire grounding. The middle three layers of floors and the phase shift lines respectively form transmission and reflection band-shaped phase transmission lines, the lengths of the phase shift lines are adjusted according to different positions of each unit in the array, and spherical electromagnetic waves are converted into planar electromagnetic waves. The broadband bidirectional beam communication antenna has the advantages of broadband, low cost, bidirectional beam transmission and the like, and can be used for broadband bidirectional beam communication antennas.

The invention relates to a single-polarization anti-resonance optical fiber, in particular to an asymmetric cladding structure single-polarization anti-resonance optical fiber working in a terahertz wave band, six longitudinal double-layer nested cladding tubes and two transverse double-layer nested cladding tubes are arranged in an optical fiber cladding, a protective tube is arranged outside the optical fiber cladding, and a perfect matching layer is arranged outside the protective tube; the six longitudinal double-layer nested cladding pipes are divided into two groups with the same number by the two transverse double-layer nested cladding pipes, and the six longitudinal double-layer nested cladding pipes and the two transverse double-layer nested cladding pipes are uniformly distributed on the circumference; the longitudinal double-layer nested cladding tube is composed of a first inner cladding tube and a first outer cladding tube, and the transverse double-layer nested cladding tube is composed of a second inner cladding tube and a second outer cladding tube. The loss of X polarization FM and the loss of Y polarization FM at 1 THz are 9.07 dB / m and 2.59 * 10 <-5 > dB / m respectively, and the PLR reaches up to 349318. The structure can effectively reduce the transmission loss and increase the polarization loss ratio, and the single polarization effect is good.

The invention discloses a 2-bit multi-polarization reconfigurable electric control metasurface antenna which comprises a linear polarization feed source horn and a reflection type metasurface. The reflective metasurface comprises a plurality of metasurface units arranged periodically, and each metasurface unit comprises a first metal layer, a first dielectric plate, a second metal layer, a prepreg layer, a third metal layer, a second dielectric plate and a fourth metal layer which are sequentially and coaxially stacked from top to bottom. And two pairs of p-i-n diodes are integrated on each metasurface unit and are used for regulating and controlling linearly polarized waves from the feed source. According to the metasurface antenna, the radiation capacity of dual linear polarization and dual circular polarization is achieved through the single linear polarization feed source and the single reflection type metasurface at the same time, the beam scanning capacity of + / -60 degrees is achieved, and the aperture efficiency is high. In addition, a direct-current control circuit for controlling a p-i-n diode switch is designed on the back surface of the reflective metasurface, so that the integration level of the metasurface system is greatly improved. The metasurface antenna has the advantages of being simple in structure, large in polarization number, low in structural complexity and high in integration degree.

The invention discloses a synthetic aperture radar (SAR) image ground object classification method based on comparative learning and a graph network. The method comprises the following steps: segmenting an SAR amplitude image into superpixels by using simple linear iterative clustering, and sampling to obtain feature pixel points; performing continuous two-dimensional sub-band decomposition on the feature pixel points in the SAR single-view complex data based on a time-frequency analysis theory of short-time Fourier transform to obtain a change image instant spectrogram of the backscattering intensity of the target under different azimuth angles and different electromagnetic wave frequency bands; utilizing a supervised contrast learning model to train an encoder network, and extracting potential features in the time-frequency spectrogram; segmenting the feature vector of the time-frequency spectrogram by using a graph convolutional neural network model; and finally, correcting a segmentation result by using spatial neighborhood features to obtain a final ground feature classification result. According to the method, under the condition that only scattering structure features in single-polarized SAR image data are used, the high-precision classification task of ground objects in the SAR image is achieved, and the requirement for an SAR sensor by using full-polarization data is avoided.

The invention belongs to the technical field of wireless communication and radar, and discloses a dual-polarization and high-isolation thin Ku / Ka wave band shared aperture phased-array antenna which is composed of a dual-polarization Ku element and four single-polarization Ka elements. According to the low-profile design, the profile height of the antenna is only 2.35 mm, and the antenna is crucial to the application field with limited space. The Ka wave band element works in the frequency band of 32-36 GHz, the Ku wave band element covers 14-18 GHz, and a wide frequency range is provided for various communication and radar applications. High isolation: the dual-polarization port of the Ku wave band shows the isolation higher than 30dB in a scanning range of 0-60 degrees, and the minimum interference between polarization is ensured. In addition, the channel isolation between the Ku wave band and the Ka wave band exceeds 35dB in the Ku wave band and exceeds 18dB in the Ka wave band, so that the signal integrity can be kept and the crosstalk can be reduced.

The invention provides a passive three-dimensional reconstruction method and device based on single polarization information, and the method comprises the steps: obtaining the polarization degree and polarization normal information of each pixel point on the surface of a to-be-reconstructed target, and enabling the polarization normal information to comprise a polarization normal azimuth angle and a polarization normal zenith angle; determining prior gradient information corresponding to each pixel point according to the polarization normal zenith angle of each pixel point based on a linearization iterative algorithm; correcting polarization normal azimuth angles of the corresponding pixel points according to the prior gradient information corresponding to the pixel points; determining a real normal of the corresponding pixel point according to the polarization normal zenith angle corresponding to each pixel point and the corrected polarization normal azimuth angle; according to the real normal lines of all pixel points corresponding to the to-be-reconstructed target, the three-dimensional surface of the to-be-reconstructed target is reconstructed, the problem of polarization normal azimuth angle ambiguity is solved, and high-precision three-dimensional reconstruction based on single polarization information is realized.

The invention discloses a river and lake dike long time sequence vertical settlement monitoring method comprising the following steps: carrying out data preprocessing on long time sequence satellite SAR data to obtain VV and VH data or HH and HV data in a dike protection range; extracting a water body, calculating the frequency of the target area monitored as the water body, and performing permanent surface water and other surface features distinguishing on the frequency by setting a specified distinguishing value to generate a land mask; classifying VV or HH single-polarized data of different data sources and satellite incidence angles, and then extracting the vertical settlement of a dike range mask area by adopting a time sequence InSAR method based on a high-resolution DEM and stable ground actual measurement points or PS points with small settlement; correlation analysis is carried out, vertical settlement data which meet correlation conditions and are obtained based on different data sources and satellite incidence angles are fused, and vertical settlement information of the dike is obtained. According to the invention, the vertical settlement data in the river and lake dike management range can be efficiently and accurately obtained.

The invention discloses a method for regulating and controlling the spin state of a two-dimensional antiferromagnetic semiconductor by using a JANUS structure, and the method comprises the following steps: constructing a two-dimensional antiferromagnetic semiconductor material structure model, and carrying out the geometric optimization; calculating magnetic properties and electronic properties based on the optimized structure; replacing halogen atoms on one side to obtain a two-dimensional A-type antiferromagnetic semiconductor material structure model with a JANUS structure, and performing geometric optimization; based on the optimized JANUS structure, the magnetic property and the electronic property of the JANUS structure are calculated; and comparing the spin state near the Fermi level of the optimized two-dimensional antiferromagnetic semiconductor material with the spin state near the Fermi level of the optimized two-dimensional A-type antiferromagnetic semiconductor material with the JANUS structure. According to the method, on the basis of a two-dimensional antiferromagnetic material, a JANUS structure is introduced, the magnetism of the material is not changed, meanwhile, a single polarization spin electron current is introduced at the Fermi level, and a theoretical model is provided for preparing related materials.

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.

Example embodiments relate to configuration of polarization or orbital angular momentum (OAM). A method may comprise: transmitting or receiving, by an access node of a first cell with antenna(s), signal(s) to / from at least one edge area of the first cell using single-polarization or single-OAM mode communication with a first polarization or OAM mode; and transmitting or receiving, by the access node of the first cell with the antenna(s), signal(s) to / from at least one non-edge area of the first cell using multi-polarization or multi-OAM mode communication with the first polarization or OAM mode and at least a second polarization or OAM mode, wherein the second polarization or OAM mode is substantially orthogonal to the first polarization or OAM mode and configured for single-polarization or single-OAM mode communication at at least one edge area of a second cell, wherein the second cell is adjacent to the first cell.

The invention provides a system and a method for realizing large-view-angle super-multi-view three-dimensional display, and the system comprises a backlight module which is used for generating multi-directional collimation backlight; and the display panel is used for loading the coded viewpoint image sequence and the metasurface array with multi-angle polarization response and / or multi-angle incidence response, receiving intensity information of each viewpoint image, and performing phase and / or amplitude modulation on the linear polarization components with different polarization angles and / or the light rays with different incidence angles, so as to obtain the image intensity information of each viewpoint image. And finally, the light rays are diffracted, propagated and converged to different viewpoints through the metasurface array. Wherein the size of the metasurface nanostructure is matched according to a phase-amplitude-nanostructure size lookup table (LUT) method. Compared with cylindrical lens type super multi-view three-dimensional display, the system can control the phase and the direction of light with high precision; compared with a metasurface array responded by a single polarization angle or a single incidence angle, the metasurface array has the advantages that the flexibility and the degree of freedom of design are improved, and three-dimensional display with higher resolution and larger visual angle can be realized.

The invention discloses an SAR sea peak suppression imaging method and system based on STFT, and belongs to the technical field of synthetic aperture radar signal processing. The method comprises the following steps: performing range pulse compression on received original SAR echo data; taking data of one range gate in the range pulse compression result, and performing short-time Fourier transform along the azimuth direction; calculating the correlation between the short-time Fourier spectrum energy statistical distribution with the sea peak interference and the short-time Fourier spectrum energy statistical distribution without the sea peak interference, and obtaining a threshold value for suppressing a sea peak echo signal; suppressing the time-frequency point of which the short-time Fourier spectrum energy is greater than the sea peak echo signal suppression threshold value, and obtaining effective time-frequency domain data; and carrying out inverse short-time Fourier transform on the effective time-frequency domain data to obtain reconstructed SAR echo data and realize SAR sea peak suppression imaging. According to the method, HH and VV dual-polarization data does not need to be acquired at the same time, single-polarization data can be processed, the calculated amount is simplified, and SAR sea peak echo signals can be effectively suppressed.

The invention discloses a polarization imaging system based on a super-structure micro-lens array and a construction method of the super-structure micro-lens array, and relates to the technical field of polarization imaging. The polarization imaging system comprises at least one refraction lens, a metasurface full Stokes polarization micro lens array and a pixel plane, and the pixel plane is formed by arranging four detector pixel arrays; the metasurface full-Stokes polarization micro-lens array is composed of a plurality of single micro-lens arrays, and a polychromatic light source focuses when incident to the refraction lens and then is transmitted to the metasurface full-Stokes polarization micro-lens array. The metasurface full Stokes polarization micro-lens array splits light in different polarization states and focuses the light to a pixel plane, and real-time polarization imaging is carried out on an object. According to the invention, the energy utilization efficiency of a single polarization is improved from 1 / 4 to 1 / 3, which has positive significance for polarization imaging and also has positive significance for function integration and volume miniaturization of an optical imaging system.

The present disclosure relates to communications technologies, and provides a single polarized ME dipole and a basic radiator of a phased array antenna for millimeter wave or above frequency band. The radiator is an “array of the ME dipoles” with higher dielectric constant, and can be manufactured with the multilayer PCB or LTCC process. The ME dipole comprises an electric dipole made by two parts of a first metal sheet located on a top substrate layer, a magnetic dipole made by first vias connected to the first metal sheet and a third metal sheet located on a bottom substrate layer, a balun made by an other part of the first metal sheet and a third via, and a reflecting part made by a part of the third metal sheet. The substrate layers are stacked in a multilayer structure to facilitate arranging the metal sheets and the vias.

The invention discloses a sandstone slice image component identification method based on a GL-SLIC algorithm and semi-supervised learning. The method comprises the following steps: firstly, acquiring a sandstone slice image amplified by 200 times under single polarization, converting an RGB image into a CIE-Lab color space, and extracting a GLBP texture feature vector; then a GL-SLIC superpixel segmentation algorithm is constructed, and adaptive segmentation based on texture and color features is realized in combination with a Gabor filter and a local binary pattern; then implementing a region merging algorithm to generate complete mineral particles and pore fragments; finally, a classifier based on VGG16 and a discriminator based on ResNet18 are constructed, a semi-supervised self-training framework is adopted, a model is initialized by using about 6% of manual labeling samples, a high-confidence-coefficient pseudo-label extension training data set is generated through iteration, and automatic recognition of sandstone components such as quartz, pores, kaolinite, rock debris and a matrix is achieved. According to the method, the recognition accuracy of 96.3% on a test set is achieved, compared with a traditional method, the segmentation precision and the recognition accuracy are remarkably improved, the data labeling cost is greatly reduced, and an efficient technical scheme is provided for automatic analysis of geological images.

The invention discloses a broadband multi-polarization multi-beam independent regulation reflective metasurface and a design method thereof, relates to the technical field of electromagnetic metamaterials and artificial electromagnetic surfaces, and aims to solve the problem that a metasurface in the prior art generally only supports single polarization or a fixed beam direction so as to realize independent regulation of a plurality of polarization channels. According to the metasurface provided by the invention, a plurality of metasurface units form a two-dimensional array, each metasurface unit is based on a diagonally symmetrical I-shaped metasurface unit, and independent regulation and control of x polarized waves, y polarized waves, left-hand circularly polarized waves and right-hand circularly polarized waves are realized by calculating a cross polarization reflection phase and a unit rotation angle required by the position of each unit. Through phase distribution optimization design, a plurality of reflection beams with adjustable polarization channel directions can be generated in a broadband at the same time, and the antenna has remarkable advantages in anti-interference capability and system complexity reduction.

The present invention discloses a liquid crystal filled single polarization output dual-core photonic crystal fiber wavelength beam splitter, which includes: a core region and a cladding region, wherein the core region and the cladding region are filled with pure quartz glass substrate material; the core region includes a central air hole, two first air holes, two second air holes, two third air holes, and eight fourth air holes; the cladding region is located in the outer layer of the core region, and the cladding region includes a plurality of fifth air holes evenly arranged, wherein the diameter of the fifth air holes is d6, the hole spacing is a0, and the fifth air holes are arranged in a regular hexagonal structure. This beam splitter introduces liquid crystal material, is shorter than a full air hole type photonic crystal fiber, has better light transmission effect, is simpler in structure than a beam splitter based on the SPR effect, is easy to manufacture, and has lower cost.

The invention discloses a single-polarization self-coherent optical communication system and a polarization control method thereof, and relates to the field of optical fiber communication. The single-polarization self-coherent optical communication system mainly comprises a laser, a first polarization controller, an IQ modulator, a digital-to-analog converter, a second polarization controller, a polarization beam combiner, a lithium niobate polarization controller, a polarization beam splitter, a polarization-maintaining coupler, a coherent receiver, a variable optical attenuator, an avalanche photodiode and an analog-to-digital converter. By implementing the single-polarization self-coherent optical communication system and the polarization control method thereof provided by the invention, the complexity of a DSP (Digital Signal Processor) algorithm can be reduced, the power consumption and the cost of the system are reduced, and the stability of the system is improved.