35 results about "Optical branch" patented technology

The invention discloses a remote sensing target detection model based on dynamic receptive field and multi-modal fusion. The remote sensing target detection model comprises the following steps: firstly, acquiring and preprocessing an optical remote sensing image and an SAR remote sensing image; then constructing a feature extraction network of the optical remote sensing image and the SAR remote sensing image, and obtaining feature output of the optical image and the SAR remote sensing image; modal-adaptive dynamic receptive field modules are embedded into the optical branch and the SAR branch respectively and are used for dynamically adjusting the size of a target receptive field according to target characteristics; then, through a cross-modal feature alignment and fusion module, the problem of geometric distortion is solved by utilizing deformable convolution, bidirectional alignment is performed on optical image features and SAR image features, and feature-level intelligent fusion is realized by adopting a space attention mechanism; according to the method, the complementary advantages of optical and SAR images are brought into full play, the size of a space receptive field is adaptively adjusted through a dynamic receptive field mechanism, and the calculation complexity is remarkably reduced while the detection precision is ensured.

The invention discloses a corneal endothelial cell meter light path system and a corneal endothelial cell meter, and relates to the technical field of ophthalmology medical equipment.The corneal endothelial cell meter light path system comprises a first optical branch, a first auxiliary branch, a second optical branch and a second auxiliary branch; the first optical branch is used for corneal endothelial cell imaging; the first auxiliary branch and the first optical branch are symmetrically arranged, and the first auxiliary branch is used for providing a light source when the first optical branch is used for corneal endothelial cell imaging; the second optical branch is used for measuring the cornea thickness; and the second auxiliary branch is used for assisting the second optical branch in measuring the cornea thickness and positioning the Z axis of the human eye. According to the technical scheme, the optical path system of the corneal endothelial cell meter can be used for imaging the cornea and measuring the thickness of the cornea through optical path arrangement of the first optical branch, the first auxiliary branch, the second optical branch and the second auxiliary branch, the cornea and the thickness of the cornea do not interfere with each other and can be measured at the same time, and the optical path system is low in installation and adjustment difficulty and easy to develop.

The present invention discloses a method, device, medium, and equipment for detecting winter wheat under complex terrain conditions, relating to the field of image analysis technology. The method comprises: using digital elevation model data to reflect the terrain information of a preset winter wheat area; constructing a fusion segmentation network for multimodal data; an encoder comprising two residual modules and four multimodal feature fusion modules with a dual-branch structure; the dual-branch structure comprising an optical branch and an elevation branch; a decoder comprising four connected decoding modules, each of which comprises an upsampling module and a distribution feature enhancement module; the inputs of the last three upsampling modules in the decoder are respectively connected to the outputs of the first three optical branches in the encoder; the fusion segmentation network is trained using a multimodal training dataset to obtain a winter wheat detection model; and finally, the winter wheat detection model outputs a detection result. This method can accurately detect the distribution of winter wheat in complex terrain areas.

To provide an optical branch cable and an optical branch cable set that have improved ease of manufacture.SOLUTION: An optical branch cable comprises a main cable and a branch cord part. The main cable includes a plurality of optical cords each including at least one coated optical fiber, a tensile strength body, and a tape that forms an outermost layer. In the branch cord part, at least one coated optical fiber is derived to the outside of the outermost layer from the optical cords of the main cable. The optical branch cable includes an optical cord group and a core part. The optical cord group includes the plurality of optical cords bound by a first bundle. The core part includes an optical cord group bound by a second bundle and the tensile force body. The tape is wound around the core part by longitudinal lapping, and covers the core part.SELECTED DRAWING: Figure 3

The invention relates to the technical field of thin film structure design, and particularly provides an optical parameter calculation method, a prediction model training method and a wavelength selection emitter design method. According to the optical parameter calculation method provided by the invention, the optical parameters of the target material at any preset temperature can be calculated based on crystal structure data of the target material, a density functional theory, a Lorentz phonon resonance model, a first principle molecular dynamics simulation method and a Boltzmann transport equation; an optical database of a material can be perfected, so that the design coverage of the wavelength selection emitter is more comprehensive. And on the basis of the Lorentz phonon resonance model, in the process of calculating the optical parameters of the target material, phonon spectrum infrared activity optical branch transverse and longitudinal wave splitting is considered, so that the accuracy of the calculated optical parameters of the infrared spectrum band can be improved, and the designed wavelength selection emitter is further optimized.

Provided is a waveplate comprising: a transparent substrate; a pattern layer that is patterned on the transparent substrate; a first cured resin layer that is formed on at least a part of the outer periphery of the pattern layer on the transparent substrate; and a second cured resin layer that is formed in a region on the transparent substrate, said region being further to the inner side than the first cured resin layer where the pattern layer is not formed. The pattern layer has a retardation film.

The invention discloses a multi-band microwave / millimeter wave signal source with dual-port output. Comprising a narrow linewidth laser, a first optical circulator, an optical fiber coupler, a first optical amplification module, a first Brillouin gain optical fiber, a first optical filter, a first optical detector, a second optical amplification module, a second optical circulator, a second Brillouin gain optical fiber, a second optical filter and a second optical detector. On the basis of stimulated Brillouin scattering in the first Brillouin gain optical fiber and the second Brillouin gain optical fiber and light amplification of the first optical amplifier and the second optical amplifier, even-order Brillouin Stokes light with the wavelength interval being two times of Brillouin frequency shift can be obtained from the upper optical branch and the lower optical branch. The two paths of even-order Brillouin Stokes light respectively pass through two optical filters with specific wavelength selection characteristics, and the required dual-wavelength Brillouin Stokes light is selected. And the two paths of dual-wavelength Brillouin Stokes light respectively enter corresponding optical detectors for photoelectric conversion, so that the output of two paths of multi-band microwave / millimeter wave signals is realized.

An optical input / output chip and distributed computing system, including: output sub-chip includes first light processing module to form N first light branches output from laser source, divide and modulate each first light branch into M first light sub-branches according to M wavelengths, form second optical branches containing N different modes from N modulated first optical branches before being output in first polarization state; input sub-chip includes second optical processing module, to form N third optical branches containing same mode from N second optical branches containing different modes, divide out part of light in each third optical branch having been converted from first polarization state to second, and form first polarization state again, combine and demodulate light in the first polarization state without conversion in original third optical branch after having been divided into M second optical sub-branches according to M wavelengths respectively. Thus increasing both communication rate and bandwidth effectively.

The present invention provides an optical communication network system, a central office optical transmission device, and a subscriber optical transmission device that transmit control signals to each subscriber optical transmission device without hindrance when the central office optical transmission device is connected to multiple subscriber optical transmission devices using an optical branch transmission path. [Solution] An optical communication network system 1 in which a central office optical transmission device 10 and a plurality of subscriber-side optical transmission devices (ONUs) are connected by an optical distribution network 116, wherein the central office optical transmission device includes a plurality of optical transmission termination units (OLTs), an optical multiplexer that generates a downlink frequency multiplexed signal by wavelength division multiplexing a downlink optical signal, and an intensity modulator that holds a time division multiplexed control signal obtained by time division multiplexing a downlink control signal, generates a downlink frequency multiplexed signal by intensity modulating the downlink frequency multiplexed signal accordingly, and sends it to the optical branch transmission path side. The subscriber-side optical transmission device demodulates the time division multiplexed control signal from the downlink frequency multiplexed signal and extracts the downlink control signal from the demodulated time division multiplexed control signal.

The application discloses a kind of SAR data active integration's remote sensing data timing seamless reconstruction method and device, belong to remote sensing image processing and space-time information analysis technical field.Sentinel-2 waveband and Sentinel-1 dual polarization data are screened and time-space alignment, radiation normalization and cloud mask construction are completed;Parallel operation dual-branch deep network optical branch extracts multi-scale space-time characteristics, SAR branch uses deformable convolution+texture self-attention to mine multi-scale directional texture;Then optical characteristics are used as Query, in cloud mask marked area active search SAR Key-Value complementary information, realize deep fusion by cross-modal multi-head attention;Fusion result is jointly corrected by relative time distance coding, time attenuation factor and cloud perception mask, and long-time sequence attention drift is inhibited;Final level fusion multi-level feature and adaptive weighting are outputted, and full-time seamless image is outputted.

The invention discloses a mechanical transfer displacement response calculation method of a finite periodic chiral unit structure, which is used for efficiently solving a compression-torsion coupling response of a finite chiral structure and representing acoustic and optical branch polarization. The method comprises the following steps: constructing a chiral subunit dynamic model consisting of a disc and an inclined elastic rod piece, and establishing a longitudinal polarization and torsional polarization coupling relationship based on bending deformation and tension-compression deformation of the rod piece under the action of longitudinal or torsional simple harmonic load, the method comprises the following steps of: obtaining longitudinal and torsional deviation amplitude values of acoustic branches and optical branches of each disc under low frequency and high frequency, superposing the polarization of the two branches in generalized coordinates to form displacement and torsional description, calculating kinetic energy, bending potential energy and tension-compression potential energy according to the displacement and torsional description, and establishing a fluctuation control equation by adopting a Lagrange equation; and substituting the inertia matrix, the stiffness matrix, the force boundary condition and the displacement boundary condition to solve the transfer displacement response and the transfer characteristic. The method can separate and quantify two branch contributions, and is suitable for chiral phononic crystal vibration isolation and filtering structure design.

This invention relates to a packaging box for a dual-channel PLC optical splitter for a space station and its manufacturing method. The packaging box for the dual-channel PLC optical splitter for a space station includes a box body, two input optical cable protective sleeves installed inside the box body, two sets of PLC cores that serve as backups for each other, a multi-output optical cable protective sleeve, and an array slot output positioning block. The two input optical cable protective sleeves and the multi-output optical cable protective sleeve are respectively installed at both ends of the box body. One axial end of each set of PLC cores has a single fiber of multi-output protection tube. An array slot output positioning block with an array of positioning slots is installed inside one end of the box body. One axial end of the multi-output optical cable protective sleeve passes through and is fixed in multiple positioning slots. The single fiber of the multi-output protection tube passes through the multi-output optical cable protective sleeve to form a multi-output optical cable. The other axial end of each set of PLC cores has a single fiber of two input protection tubes. The single fiber of the two input protection tubes passes through the two input optical cable protective sleeves to form two input optical cables.

The application discloses a multi-site two-photon imaging stimulation device coupled by non-parallel light axes, which comprises a femtosecond laser, a laser scanning device and at least two optical branches; the optical branch comprises a first focusing optical element, a mirror and a second focusing optical element; the femtosecond laser emitted by the femtosecond laser enters the laser scanning device, the laser scanning device repeatedly scans the femtosecond laser between multiple scanning intervals, and the femtosecond laser of each scanning interval reaches a corresponding target site after passing through a corresponding optical branch; the femtosecond laser entering the optical branch is reflected to the second focusing optical element after being focused for the first time by the first focusing optical element, and reaches the corresponding target site visual field plane after being focused for the second time. The multi-site two-photon imaging stimulation device coupled by non-parallel light axes provided by the application is suitable for two-photon imaging or optical stimulation on multiple planar visual field regions with spatial angles located on a curved sample.

The present invention relates to a lidar device for detecting the environment of a vehicle (10), wherein the lidar device comprises the following: at least one laser light source (18) designed to emit laser light, a plurality n of optical heads (12) each with an optical transmitting (36) and receiving unit for emitting laser light into the environment and for receiving laser light reflected from the environment, wherein Each optical head (12) is assigned a detector (20) which is designed to convert received laser light into electrical signals, According to the invention, a first optical splitter (24) is provided which is configured to divide the emitted laser light of the at least one laser light source (18) into n parts and to direct them into n optical branches (28), each of which includes one of the optical heads (12) and one of the detectors (20).

To fulfill the needs as an optical signal switching module for a lidar.SOLUTION: An optical signal switching module used for a lidar comprises: an optical branch unit 513 that receives input of optical signals from a plurality of light sources, and selectively switches output destinations of the optical signals to one of output destinations of a plurality of channels; a waveguide type crossing unit 515 that crosses at least some optical signals of the plurality of optical signals output from the optical branch unit 513; and output terminals of the plurality of channels that individually output the plurality of optical signals output from the crossing unit 515.SELECTED DRAWING: Figure 6

A beam splitter is provided to divide incident light into a multitude of different components and to emit these components. The beam splitter comprises a first light-transmitting element, which has a first surface and is transparent to the incident light; a second light-transmitting element, which has a second surface and is transparent to the incident light; an optical branching layer, which serves to split the incident light into the multitude of components; and an adhesive element configured to connect the first and second light-transmitting elements. The first and second light-transmitting elements are arranged so that their first and second surfaces face each other, with the optical branching layer positioned between them.

An inspection circuit that accurately reflects influence of a manufacturing error generated in a modulator of a main circuit in manufacturing process of an optical circuit, and at the same time, achieves downsizing, is disclosed. The inspection circuit includes an inspection waveguide having a length of half of a length of an arm waveguide of the main circuit and is configured such that test light propagates in two directions on the inspection waveguide, thereby implementing reproduction of characteristics equivalent to those of the modulator of the main circuit. In order to propagate the test light in two directions of the inspection waveguide in the inspection circuit, a loop-shaped path configured between branch ports of the optical branches is utilized. Embodiments of different configurations are disclosed in accordance with aspects where two branch light beams of the test light are guided to the inspection waveguide.

The present invention provides a beam splitter for splitting incident light into a plurality of different components and emitting the split light, the beam splitter comprising: a first light-transmitting member having a first surface and transmissive to the incident light; a second light-transmitting member that has a second surface and is transmissive to the incident light; an optical branching film having a function of branching the incident light into the plurality of components; and an adhesive member for adhering the first light-transmitting member and the second light-transmitting member, the first light-transmitting member and the second light-transmitting member being disposed so that the first surface and the second surface face each other with the optical branching film interposed therebetween.

To provide a wavelength plate which can suppress occurrence of cracks of a retardation film.SOLUTION: A wavelength plate 10 includes a transparent substrate 11, a pattern layer 121 which is pattern-formed on the transparent substrate 11, a first curable resin layer 131 which is formed on the outer periphery of the pattern layer 121 on the transparent substrate 11, and a second curable resin layer 132 which is formed in a region where the pattern layer 121 is not formed, on the inner peripheral side of the first curable resin layer 131 on the transparent substrate 11. The pattern layer 121 has a retardation film 12b.SELECTED DRAWING: Figure 1

Provided is a waveplate comprising: a transparent substrate; a pattern layer that is patterned on the transparent substrate; and a cured resin layer that is formed in a region on the transparent substrate where the pattern layer is not formed. The pattern layer has a retardation film. When the main refractive index of the retardation film is Nx, Ny, and the refractive index of the cured resin layer is Nr, formula Nx > Nr > Ny is satisfied.

This invention discloses a method and apparatus for seamless temporal reconstruction of remote sensing data by actively integrating SAR data, belonging to the field of remote sensing image processing and spatiotemporal information analysis technology. The method involves screening Sentinel-2 and Sentinel-1 dual-polarization data and performing spatiotemporal alignment, radiometric normalization, and cloud mask construction. A dual-branch deep network is run in parallel; the optical branch extracts multi-scale spatiotemporal features, while the SAR branch mines multi-scale directional textures using deformable convolution and texture self-attention. Subsequently, the optical features are used as queries to actively retrieve complementary key-value information from the SAR data within the cloud mask-marked region, achieving deep fusion through cross-modal multi-head attention. The fusion result is then jointly corrected by relative temporal distance encoding, temporal decay factor, and cloud-sensing mask to suppress long-term attention drift. Finally, multi-level features are hierarchically fused and adaptively weighted to output a seamless, full-temporal image.

The present invention provides a communication device that is a base station included in a MIMO system using hybrid BF and RoF, the MIMO system including an optical amplifier having a constant output, the optical amplifier being provided between a multiplexer that multiplexes RoF signals and a demultiplexer that demultiplexes an output of the multiplexer by wavelengths. The communication device includes: the demultiplexer; a plurality of photoelectric converters that convert incident RoF signals into radio signals; optical branches that branch the incident RoF signals; an optical switch that switches one or both of an output destination of signals demultiplexed by the demultiplexer and an output source of signals to be input to the photoelectric converters; and a control unit that controls an operation of the optical switch on the basis of an optical level of each of RoF signals obtained by the demultiplexer by wavelengths.

This invention relates to a photonic chip-integrated micro-hemispherical resonator gyroscope, belonging to the field of microelectromechanical systems (MEMS) technology. It includes: a vacuum cavity, a substrate disposed within the vacuum cavity, and an uncoated micro-hemispherical resonator disposed on the substrate; interdigitated electrode driving units and a silicon-based photonic chip are also disposed on the substrate; the interdigitated electrode driving units are arranged below the edge of the uncoated micro-hemispherical resonator; the silicon-based photonic chip includes a laser, a first multimode interferometer beam splitter, an optical branch coherent functional component, and a photodetector connected sequentially in the optical path; the number of the optical branch coherent functional component and the photodetector corresponds to the number of output terminals of the first multimode interferometer beam splitter, and the grating coupler group in the optical branch coherent functional component is arranged below the edge of the uncoated micro-hemispherical resonator. This invention can retain the intrinsic high Q value of the resonator and achieve miniaturized and integrated micro-hemispherical resonator gyroscope.

The invention discloses a multi-mode remote sensing image semantic segmentation method and device combining an optical image and an SAR (Synthetic Aperture Radar). The method comprises the following steps: inputting an optical image and an SAR image into a multi-mode remote sensing image semantic segmentation network to obtain an image segmentation result; the processing process of the multi-mode remote sensing image semantic segmentation network comprises the following steps: inputting an optical image into an optical branch to obtain an optical image segmentation result, and inputting an SAR image into an SAR branch to obtain an SAR image segmentation result; the features corresponding to the optical images output by the optical branches and the features corresponding to the SAR images output by the SAR branches are fused to obtain optical-SAR fusion features, and the optical-SAR fusion features are input into the fusion feature branches to obtain a fusion semantic segmentation result. According to the method, the ability of the model to express semantic and detail features by using optical-SAR cross-modal features is significantly improved, and a more efficient solution is provided for improvement of prediction accuracy of a remote sensing image semantic segmentation method.

The invention relates to an optical image cloud removal method based on CNN-Transform heterogeneous architecture and SAR (Synthetic Aperture Radar) guidance, and belongs to the technical field of image processing and computer vision. The method comprises the following steps: respectively extracting structure and spectral features by constructing SAR and optical parallel double branches; cross-axis attention is integrated to an optical branch, mining of global spectral context and long-range space correlation of an optical image is realized, and meanwhile, the calculation complexity is reduced; designing a cross-modal guide mechanism between the double branches, and establishing semantic level association between structural information in the SAR image and spectral information of the optical image; and finally, realizing accurate feature alignment and adaptive weighting through a spatial adaptive fusion strategy. And finally, a high-quality reconstruction effect with a clear ground object structure and natural spectrum transition is achieved under a complex cloud coverage condition, and the precision and efficiency of the cloud removal effect are remarkably improved.

The application provides a remote sensing image cloud removing method and system based on optical remote sensing images and synthetic aperture radar images, and belongs to the technical field of remote sensing image processing. The method first acquires paired optical remote sensing images and synthetic aperture radar images; then a double-branch feature extraction network of an optical branch and a SAR branch is constructed to extract spectral and context features of the optical images and structural and texture features of the SAR images respectively; on this basis, the optical features and the SAR features are dynamically weighted and fused through a hierarchical cross-modal adaptive fusion module to obtain a fused feature map; and finally, the fused feature map is reconstructed to output a cloud-free remote sensing image. The application can realize high-quality remote sensing image cloud removing reconstruction under complex cloud conditions.

The multimodal target detection method and system based on the dual-branch asymmetric attention backbone and feature fusion pyramid network belong to the field of target detection technology. In order to solve the problem that the existing multimodal target detection method is difficult to supplement the features lacking in each mode, thus affecting the current detection effect of the multimodal. The present invention uses optical images and infrared images as inputs of the optical branch backbone network and the infrared branch backbone network. The branch backbone network includes a convolution layer and several residual modules. A detail information supplement module or a semantic information supplement module is set between each group of residual modules. The detail information supplement module and the semantic information supplement module are alternately set in the sequential processing direction of the residual module; the two feature pyramids obtained by the two branches are sent to the feature fusion unit, and the feature fusion unit uses the features of each layer of the feature fusion pyramid network to fuse, and the final fusion features of multiple scales are sent to the detection unit for detection.

An apparatus (1) for spectral analysis of optical signals and a spectral analysis method using said apparatus, wherein the apparatus (1) comprises: an optical filtering stage (2) having an optical path (5); a photodetector (17) optically connected downstream of the optical filtering stage (2); an actuator (18) configured for changing an optical refractive index of at least one portion of the optical path (5); wherein the optical filtering stage (2) comprises a first Mach-Zehnder interferometer (6) and a first ring resonator (7), cascaded to each other to form a respective part of the optical path (5), and wherein a respective optical path difference (dL0) between a first (11) and a second optical branch (12) of the first Mach-Zehnder interferometer (6) is greater than zero, the first Mach-Zehnder interferometer (6) is optically connected to the rest of the optical path (5) via one and only one first port (13) of the input optical couplers (9) and one and only one second port (14) of the output optical couplers (10).

Provided are an optical branch board and a transmission network, relating to the field of optical communications, the optical branch board having the ability to schedule optical signals to more optical line directions, thereby improving the pooling sharing degree of transmission resources of a transport capacity pool. The optical branch board is applied to a transmission network, and the transmission network comprises a plurality of client side devices on a client side and a plurality of line side devices on a line side. In the structure, the optical branch board comprises N line side ports, M equipment side ports and M wavelength selection switches, wherein the wavelength selection switch comprises one public port and N branch ports, the public port of the wavelength selection switch is used for connecting the equipment side port, and the N branch ports of the wavelength selection switch are used for connecting the N line side ports respectively; the equipment side port is used for connecting client side equipment, and the line side port is used for connecting line side equipment. The embodiment of the invention is applied to optical communication.

The invention discloses an SAR and optical image fusion-oriented modal collaborative adaptive weight space target identification method, which comprises the steps of S1, constructing a multi-modal data set of satellite optical and SAR images, the data set comprising N pairs of registered SAR and optical images and corresponding category labels; s2, respectively extracting depth feature representations of the optical image and the SAR image obtained in the S1; s3, predicting the imaging quality of each modal of the depth features extracted in the S2, realizing QADA quality perception fusion through quality-guided asymmetric cross attention, constructing quality-enhanced fusion feature representation, and calculating the basic loss of an optical branch, an SAR branch and a fusion branch; s4, based on the three-branch basic loss and the prediction probability calculated in the S3, dynamically calculating respective loss weights through five cooperative factors MSAW, and jointly optimizing three-branch network parameters by using weighted total loss and consistency regularization until convergence; and S5, inputting the test data into the network to predict and identify the satellite category.