118results about How to "Improve Modulation Capabilities" patented technology

The invention relates to the technical field of terahertz spectrums, in particular to a graphene-based all-optically controlled ultra-high speed terahertz intensity modulator. The technical problems of low modulation speed and narrow spectrum range of the conventional terahertz intensity modulator are solved, and the application range of a system is widened. According to the graphene-based all-optically controlled ultra-high speed terahertz intensity modulator, gold nanoparticles are adopted, so that the photon absorption efficiency of graphene is enhanced, the concentration of photon-generated carriers is improved, the absorption of terahertz waves is further enhanced, and the modulation effect of the modulator is enhanced. The graphene-based all-optically controlled ultra-high speed terahertz intensity modulator comprises a terahertz wave generation device, a pumping light wave generation device, a terahertz intensity modulator and a terahertz wave detection device, which are connected to finish the design of the graphene-based all-optically controlled ultra-high speed terahertz intensity modulator. The graphene-based all-optically controlled ultra-high speed terahertz intensity modulator is mainly applied to the fields of terahertz communication systems and terahertz researches.

Low cost implementation of broadband upstream transmission for local and access network applications is made possible through the use of modulated downstream signals in a wavelength division multiplexed (WDM) passive optical network (PON) to injection-lock vertical-cavity surface-emitting lasers (VCSELs) for operation as stable, uncooled, and directly-modulated upstream transmitters. By way of example and not limitation, an optical network unit comprises: downstream input, photoreceiver, tunable laser, upstream output, and means for directionally coupling the downstream input into the tunable laser for modulating the output wavelength which is coupled to the upstream output.

The invention discloses a liquid crystal raster, manufacturing method and driving method thereof and optical phase array device. A plurality of first electrodes are formed on a lower substrate, first gaps are formed between adjacent first electrodes, second electrodes are further arranged above the first gaps, second gaps are formed between adjacent second electrodes, and an insulation layer is arranged between the first electrodes and the second electrodes. When a voltage is loaded on the first electrodes and the second electrodes, an electric field changing continuously, smoothly and slowly is generated in the liquid crystal raster, therefore, the phase positions of incident light can be controlled continuously, smoothly and slowly, and the modulation capability of the liquid crystal raster to light beams is improved directly.

The invention belongs to the technical field of semiconductor power devices. A silicon-based power device based on a substrate bias technology forms a reverse-biased PN junction by a compound substrate structure with reverse conduction type; by the electric field distribution in a substrate electric-field modulator, the longitudinal electric-field peak value is reduced, and the whole blocking voltage born by the conventional power device in the longitudinal direction is changed into a part of the blocking voltage, so that the voltage resistance of the device is enhanced, and the compromise relation of the power device between conducting resistance and breakdown voltage is improved. By utilization of the silicon-based substrate bias technology provided by the invention, the structure of the device can be designed by flexibly combining multiple surface terminal technologies. The silicon-based power device structure can be utilized for manufacturing various high-voltage-resistant devices with excellent performance, for example, the power devices such as lateral double-diffusion field effect transistors, PN diodes and lateral insulated gate bipolar type power transistors and the like.

The invention discloses a Si-based gallium oxide film back gate solar-blind ultraviolet ray transistor and a preparation method thereof, and belongs to the photoelectric detector and semiconductor transistor technical field; the transistor comprises the following parts arranged from bottom to top in sequence: a back gate electrode layer, a substrate layer, a light-sensitive layer and an interdigital electrode layer; the substrate employs a p-Si / SiO2, and a gallium oxide film is prepared and grown on a SiO2 layer of the p-Si / SiO2 substrate so as to serve as the light-sensitive layer; an Au / Ti electrode is sputtered on the gallium oxide film so as to form the interdigital electrode; a metal Au film is sputtered on the Si layer of the backside of the p-Si / SiO2 substrate so as to serve as theback gate electrode. The preparation process is simple, and a silicon base device can be easily integrated; the method is strong in controllability, easy to operate, and the obtained film is compact in surface, even and stable in thickness, good in repeatability, easy to integrate, and can be massively made; the prepared device structure can be regulated and controlled by the gate voltage so as toobtain high solar-blind ultraviolet ray current gains.

The invention relates to the technical field of microwave power device in semiconductor materials, discloses a AlGaN / GaN HEMT multilayer field board device of recessed grid, and meanwhile discloses a method for manufacturing AlGaN / GaN HEMT multilayer field board device of the recessed grid; on the basis of common AlGaN / GaN HEMT device manufacturing process, the method comprises the steps of photo-etching grid images after forming Ohm contact of a source electrode and a drain electrode, etching AlGaN extension layer of a part of the grid image, after evaporating grid metal, firstly manufacturing a grid connection field board and then a source connection field board to form the AlGaN / GaN HEMT multilayer field board device of the recessed grid. Utilization of the invention can efficiently improve puncturing characteristic, transconductance and threshold value voltage of the AlGaN / GaN HEMT device, and at the same time of improving the device plus, availably suppress phenomenon of current collapse of the AlGaN / GaN HEMT device.

The invention discloses a preparation method for a side gating graphene field effect transistor structure based on chemical vapor deposition graphene. The preparation method comprises placing copper foil in a reaction chamber, vacuumizing the reaction chamber, and performing thermal annealing on the copper foil; growing the graphene by chemical vapor deposition (CVD); transferring the graphene to a high k substrate; utilizing a lithography machine to expose source drain and side gating positions; utilizing an oxygen plasma etching machine to etch the graphene at the side gating positions; using an E-beam device to evaporate metal on a sample; enabling the sample where the metal is evaporated to be placed in acetone to perform ultrasonography, then rinsing the sample in absolute ethyl alcohol, using deionized water to flush the sample, and finally using pure nitrogen to dry the sample. Due to the fact that the side gating structure is adopted, deposition of a top gate medium is avoided, and poor influence of the top gate medium on the graphene material property is avoided. Due to the fact that the high k substrate is adopted, the modulation capability of side gating on a graphene conducting channel is improved.

The present invention relates to a decoding apparatus and method, a program storage medium, and a program, which allow high-performance decoding of a modulation code encoded in accordance with a variable-length table. A 17PP-SISO decoder 181 performs SISO decoding on a signal supplied from a PR-SISO decoder 81 by using a Viterbi decoding algorithm or a BCJR decoding algorithm in accordance with a trellis represented by paths corresponding, in a one-to-one fashion, to overall transitions in an entire encoding process in accordance with an encoding table 201 of a 17PP code. A resultant SISO-decoded signal is supplied to a turbo decoder 84 via a deinterleaver 83. The turbo decoder 84 performs turbo decoding on the signal output from the 17PP-SISO decoder 181. The present invention can be applied to a recording / reproducing apparatus for recording / reproducing a signal on / from a storage medium such as a high-density optical disk.

The invention relates to a ferro-electricity film phase shifter, pertaining to the field of microwave engineering technology, which comprises a coplanar line structure that comprises a transmission line constituted by a general conductive film and ground planes on both sides thereof. Aequilate slots are arranged between the ground planes and the transmission line, interdigited capacitor structures are arranged mutually and periodically on the transmission line and the ground planes on both sides thereof, the conductive film is directly fixed on to the substrate of an underlay, and ferro-electricity films are provided in the slots between the mutually interdigited transmission line and the ground planes. The intedigited capacitor structure of the invention places equal attention to advantages of simple manufacturing technology of a general intedigited capacitor and to that a parallel plate capacitor structure can highly concentrate impressed electric field into the ferro-electricity film, thus realizing the advantage of large phase shifting capacity under low voltage and having potential and broad practical prospect.

The invention discloses a graphene based surface plasmon polariton electric-absorption light modulator.The graphene based surface plasmon polariton electric-absorption light modulator comprises a substrate, a first micro-nano waveguide, a second micro-nano waveguide, a dielectric layer, first single-layer graphene, a first electrode and a second electrode, wherein the first micro-nano waveguide and the second micro-nano waveguide are stacked on the substrate, the dielectric layer and the first single-layer graphene are located between the first micro-nano waveguide and the second micro-nano waveguide, and the first electrode and the second electrode are respectively connected with the first micro-nano waveguide and the second micro-nano waveguide and are used for exerting modulation voltage.At least one of the first micro-nano waveguide and the second micro-nano waveguide is a metal waveguide.The first single-layer graphene is located between one metal waveguide and the dielectric layer.One of the electrodes is connected with the corresponding metal waveguide through the first single-layer graphene.The graphene based surface plasmon polariton electric-absorption light modulator adopts the structural design of vertical arrangement, integrates with the advantages of the graphene and SPP and enables the modulation height to be higher than the height of an existing electric-absorption light modulator and to reach 70% or above.In addition, the light modulator is smaller in structural capacitance, and the overall response speed of the light modulator is greatly improved.

The invention provides a direct-current power modulating method for a high-voltage direct-current power transmission system. According to the method, a dynamic new balance point is used as a control target, the system power oscillation caused by small disturbance can be fast damped, a higher modulation effect is realized, in addition, the debugging method uses the new balance point as the control target, the better modulation effect is also realized on large disturbance, and the robustness is high. Through simple system parameter determination and conversion, the direct-current power modulation quantity can be obtained, an electric power can fast damp the interval power oscillation under the conditions of fault generation and disturbance receiving, and the stability of the electric system is effectively recovered.

A surface emitting laser is provided with a first multilayer Bragg reflecting mirror including a first layer, a second multilayer Bragg reflecting mirror including a second layer, and an optical resonator unit that is held between these multilayer Bragg reflecting mirrors and includes an active layer. Further, the optical resonator unit contacts with the first layer and second layer respectively. The effective refraction index neff of the resonator unit is larger than either the first layer or the second layer, and an optical length neffL of the optical resonator unit has a relationship with an oscillating wavelength λ of the surface emitting laser to satisfy the following relationship: 0.5λ<neffL≦0.7λ.

The invention relates to a magneto-optic plasma biosensor, which belongs to the field of optical sensing, and particularly relates to the magneto-optic surface plasma resonance technology. The magneto-optic plasma biosensor comprises a silicon dioxide substrate and a gold film, wherein on the silicon dioxide substrate, and between the substrate and the gold film, a titanium nitride layer, a silicon dioxide layer, a yttrium iron garnet layer and a cerium-doped yttrium iron garnet layer are sequentially arranged in a direction from the substrate to the gold film. The magneto-optic plasma biosensor provided by the invention has the beneficial effects of novel structure, high quality factor, material stability, difficulty in oxidization, simple in structure, and low in cost.

The invention discloses a method for manufacturing a three-dimensional superconduction micro-nano device, relating to three-dimensional micro-nano device technology. The method provided by the invention comprises the following steps: (1), growing a superconduction electrode contact block or a connecting wire; (2) placing and fixing a processed sample in the step (1); (3), putting the sample fixed on a sample support on a sample stage arranged in a vacuum chamber of an ion beam device; (4) growing a superconduction micro-nano material freely standing on the superconduction electrode contact block or the connecting wire; (4), controlling deformation of the micro-nano material manufactured in (4B); and (6), obtaining a finish product. In the manufacturing method provided by the invention, a superconduction micro-nano structure which is not positioned in a support substrate plane is manufactured based on the control for the deformation of the freely-standing nano material by ion beam irradiation, so as to form the three-dimensional superconduction micro-nano device which is in a certain included angle with the support substrate plane; and the method provided by the invention is flexible in process, high in efficiency and good in control.

A power supply modulator includes: a linear regulator; a switching regulator; and a mode-based connection circuit. The mode-based connection circuit includes a coupling circuit configured to drop an output signal of the linear regulator by a target coupling voltage in an envelope tracking (ET) modulation mode; and a coupling voltage management circuit configured to monitor a coupling voltage of the coupling circuit in another modulation mode, and selectively apply a voltage to the coupling voltage based on a monitoring result such that the coupling voltage is maintained at the target coupling voltage.

The invention discloses a visual angle diffusion diaphragm and a display panel. The visual angle diffusion diaphragm comprises a substrate and a refraction protrusion arranged on the substrate. The refraction protrusion comprises a first part and a second part, a first included angle is formed between the first side face of the first part and the surface of the substrate, the second part comprisesa second side face close to the first side face, and a second included angle is formed between the second side face and the surface of the substrate. The first side face of the first part of the refraction protrusion is not parallel to the second side face of the second part; when a light beam emitted by a light source of the display panel is emitted into the refraction protrusion, the propagation direction of the emergent light refracted by the parallel light rays through the first side face is not parallel to the propagation direction of the emergent light refracted by the second side face;therefore, the visual angle diffusion diaphragm has a plurality of modulation angles for one beam of incident light, when the visual angle diffusion diaphragm is applied to the display panel with theconcentrated light shape emitted by the light source, the light shape of the modulated emergent light is more dispersed, and the image quality effect of a large-visual-angle display image is improved.

The invention relates to the technical field of imaging and spectrum recognition, in particular to a monolithic integrated image sensing chip and spectrum recognition equipment. A light modulation layer of the chip is integrated on an image sensing layer; the light modulation layer comprises at least one sub-modulation layer arranged in the thickness direction of the light modulation layer; each set of pixel confirmation module comprises modulation units and induction units; at least one group of modulation units are distributed on the light modulation layer along the surface of the light modulation layer; at least one group of induction units are distributed on the image sensing layer; each group of modulation units and at least one group of induction units are correspondingly arranged along a vertical direction; a signal processing circuit layer is connected to the lower surface of the image sensing layer and is electrically connected with each sensing unit. According to the chip andthe equipment, the monolithic integration of a light splitting part and a wafer is realized; hyperspectral imaging can be realized; the failure rate of a device is favorably reduced; the yield of finished products of the device is improved; and the chip and the equipment are stable in performance and are not easily influenced by an external environment.

The invention provides a full two-dimensional gas chromatograph modulator based on a semiconductor heating and cooling technique. The full two-dimensional gas chromatograph modulator comprises a refrigeration system, a heating system and a control system. The refrigeration system and the heating system are respectively connected to the control system. The refrigeration system comprises a heat radiating device, a refrigeration sheet, a first heat insulating pad and a cold conduction block. The heat radiating device, the first heat insulating pad and the cold conduction block are orderly laminated tightly. The refrigeration sheet is installed in the first heat insulating pad. The heating system comprises a heater, a second heat insulating pad and a heat conduction block. The second heat insulating pad and the heat conduction block are closely laminated. The heater is installed in the second heat insulating pad. The modulator has a simple structure, is easy to control and install and can effectively save the experimental cost and the laboratory space.

The invention discloses a license plate recognition method and device for a intelligent city. The recognition method comprises the steps of obtaining a segmented license plate image, obtaining a trained license plate image classification network, performing super-resolution reconstruction on the license plate image by using a reconstruction sub-network, classifying the super-resolution license plate image by using a classification sub-network and the like. The classification subnet comprises a middle convolutional layer, a residual feature extraction unit, a tail global average pooling layer, a tail full connection layer and a tail softmax activation layer, and the reconstruction subnet comprises a head convolutional layer, a GMT feature extraction mechanism, a feature fusion unit and an image amplification unit. According to the method, the reconstruction subnet and the classification subnet are connected together to form a network, the image output after reconstruction of the reconstruction subnet is most beneficial to low-resolution license plate recognition, the network is high in low-resolution license plate recognition accuracy, the operation speed after deployment is higher than that of a conventional two-step method, and the construction requirement of a intelligent city can be better met.

The invention discloses an all optical fiber type electro-optic modulator based on a D-shaped double core optical fiber, and belongs to the field of a special optical fiber, optical fiber communication and signal processing. A core (2) in the D-shaped double core optical fiber (1), which is positioned in the center, is connected with an input end single mode optical fiber, and a core (3) close to a boundary is connected with an output end single mode optical fiber. The surface of the D-shaped double core optical fiber (1) is coated with an electro-optical polymer (4), and both sides of the electro-optical polymer are plated with metal electrodes (5) and are connected with voltage loading devices (6). When voltages (6) are loaded, a refractive index of the electro-optical polymer (4) is changed along with the voltages, the core (3) close to the electro-optical polymer (4) is sensitive to change of the refractive index of the electro-optical polymer (4), and the core (2) positioned in the center is insensitive to the change of the refractive index of the electro-optical polymer (4). When the voltages (6) loaded to both the ends of the electro-optical polymer (4) are changed, a coupling degree of two cores is changed, so that strength modulation of light can be achieved.

The invention relates to a redundant configuration inertial measurement unit biaxial rotation modulation method. A universal redundant inertial measurement unit constant error model is constructed byutilizing the characteristic that a redundant configuration inertial measurement unit constant error is formed by linearly combining sensor constant errors of the redundant configuration inertial measurement unit constant error, and constant error modulation is performed on the redundant inertial measurement unit through double-axis rotation to realize error compensation. On the basis, the influence of carrier angular motion on biaxial rotation modulation in actual navigation is considered, a biaxial rotation scheme based on an attitude angle is provided to realize error modulation under a navigation system, the carrier angular motion is effectively isolated, and the error modulation effect is improved. According to the invention, constant error modulation can be carried out on the redundant configuration inertial measurement unit, a good modulation effect can still be achieved under the condition that the carrier performs angular motion, and the navigation precision of the redundant configuration inertial measurement unit is significantly improved. The invention belongs to the technical field of inertial navigation, and the method can be applied to error compensation of the redundant configuration inertial measurement unit.

The invention discloses an optical modulation module. According to the optical modulation module, FSK / ASK (Frequency Shift keying / Amplitude Shift Keying) orthogonal modulation signals can be produced for signal and label transmission. The module comprises a laser, a double-parallel modulator, a 90-degree phase modulator, a cosine signal generator, a multiplier and two signal generators. One signal generator generates a Manchester signal. The other signal generator generates bipolar NRZ codes. The cosine signal generator generates two ways of cosine signals. One way of cosine signal generates a first control signal after 90-degree phase modulation is carried out on the cosine signal by the Manchester signal. The other way of cosine signal is taken as a second control signal. The bipolar NRZ codes and the Manchester signal are multiplied to generate a third control signal. Under the modulation of the three ways of control signals, the double-parallel modulator modulates the laser output by the laser, thereby generating FSK / ASK signals. Compared with an existing FSK / ASK modulation system with at least two optical modulators, the modulation module provided by the invention has the advantages that only one optical modulator is applied, the structure is simple, attenuation can be reduced, and the transmission performance can be improved.

The invention discloses a photonic crystal micro-ring modulator chip based on a lithium niobate film. The photonic crystal micro-ring modulator chip comprises a chip substrate, a chip lower cladding layer, a waveguide core layer and a chip upper cladding layer. According to the invention, an input optical waveguide, a photonic crystal micro-ring modulation structure and an output optical waveguideare integrated on a waveguide core layer, wherein the photonic crystal micro-ring modulation structure is composed of a single straight-through waveguide and a closed annular waveguide, the straight-through waveguide is of a two-dimensional line defect photonic crystal waveguide structure, the annular waveguide is of a two-dimensional circular lattice annular resonant cavity type photonic crystalwaveguide structure, a modulation electrode is arranged on the annular waveguide, the waveguide core layer is made of a lithium niobate film material, the device size can be greatly reduced and the integration degree can be improved while the high electro-optical coefficient is achieved, the electro-optical effect is enhanced in combination with the photonic crystal waveguide slow light effect, the modulator works at a low driving voltage, and the structural size is further reduced. The modulator chip is simple in manufacturing process and easy to integrate and expand, and has good reliability and performance stability.

The invention discloses a magnetic flux modulation stator structure using an axial sectional hysteresis loop. The structure comprises a slotted stator, surrounding type windings and hysteresis loops.The slotted stator comprises a stator yoke, stator inner grooves and stator outer grooves. Each stator inner groove is wound with one surrounding type winding. Each hysteresis loop is formed by connecting hysteresis bodies and non-conductive magnets, and the hysteresis bodies and the non-conductive magnets are distributed alternately. The size and the number of the hysteresis bodies are matched with the number and the positions of the stator outer grooves. One or more hysteresis loops are arranged on the back of the slotted stator in the axial direction to form an axial sectional hysteresis loop structure. The hysteresis loop position is changed through the motion mechanism, and magnetic flux modulation is realized through mutual cooperation and combined action of the hysteresis loop and the stator outer groove. According to the invention, the hysteresis effect of the material is utilized to influence the magnetic circuit of the surrounding winding, so that the harmonic component in the motor is changed.

The invention relates to a terahertz wave electric control modulation method based on a Dirac semimetal microstructure. The method is realized through a terahertz wave modulator based on a Dirac semimetal microstructure. The terahertz wave modulator comprises a polymer flexible substrate, an epitaxial layer, an insulating layer and a Dirac semimetal microstructure, wherein a gold thin layer and achromium thin layer are arranged on the Dirac semimetal microstructure; the chromium thin layer is arranged on the gold thin layer; the epitaxial layer is arranged on the polymer flexible substrate; the insulating layer is arranged on the epitaxial layer; the Dirac semimetal microstructure is an active region of the terahertz wave modulator and is arranged on the insulating layer; and external voltage is applied between the Dirac semimetal microstructure and the epitaxial layer to change the corresponding Fermi level so as to adjust the waveform of the resonance spectral line. Compared with the prior art, the method has the advantages that the amplitude modulation depth and the frequency modulation depth are improved, the manufacturing process is simpler, the feasibility is better, and thelike.

A method of manufacture of a substantially continuous circumferential coating on a non-planar substrate, is disclosed the method comprising the steps of: utilising a substantially non directional deposition technique and a substantially static substrate deposition geometry to deposit the coating. Coatings can be deposited which include piezoelectric modulation characteristics or electro-optic modulation characteristics. Ideally the coating has semiconducting properties. The type of coating ideally includes Zinc-Oxide coatings. The non directional deposition technique can comprise chemical vapor deposition via single source chemical vapor deposition. Suitable substrates include optical fibers which are clamped onto a substantially planar heating surface during the deposition. The optical fiber can be clamped at a portion of the length of the fiber which is located at one end of a heating surface during the deposition such that movement of a free end of the optical fiber is limited to movement substantially along the axis of the optical fiber.

The invention discloses a polarization-doped InN-based tunneling field effect transistor, and the problem that the random doping fluctuation caused by the conventional physical doping technology leadsto a decrease in device performance, the manufacturing process is complicated and the reliability is low are mainly solved. The polarization-doped InN-based tunneling field effect transistor comprises a substrate (1), a buffer layer (2) and a body region (3) from the bottom to top. An upper right part of the body region is provided with a polarized inversion layer (4), a dielectric layer (8) is deposited on an upper portion of the body region and a left side and an upper portion of the polarized inversion layer, a gate step (9) is etched on the left side of the dielectric layer, a modulationplate (10), a gate electrode (11) and a tunneling gate (12) are orderly deposited on an upper part of the dielectric layer from the right to the left, lower steps (5) are etched at two sides of the body region, and the upper parts of the left and right sides of the steps are provided with a source electrode (7) and a drain electrode (6). According to the invention, the annealing process in the traditional physical doping technology is avoided, the output current and sub-threshold swing of a device are improved, the device reliability is improved, and the polarization-doped InN-based tunnelingfield effect transistor can be used in a low-power circuit system.

The invention discloses a laser driving circuit and a piece of laser equipment. The laser driving circuit includes a first N-channel MOS tube, a second N-channel MOS tube, a current mirror and a firstresistor. The drain of the first N-channel MOS tube is connected with a first end of the first resistor, and a second end of the first resistor is connected with a preset power supply. The first N-channel MOS tube is connected with a preset laser and the current mirror. A preset DC voltage signal is obtained at the gate of the first N-channel MOS tube. The source of the first N-channel MOS tube is connected with the drain of the second N-channel MOS tube. A preset CML signal is obtained at the gate of the second N-channel MOS tube. Because the second N-channel MOS tube, namely, the input tube, is not a tail current tube, the use of a larger tail current tube is avoided, and the device area is reduced. The introduced first resistor can improve the modulation current, so that the driving ability is improved, and the technical problem that the driving ability and the device area cannot both be taken into account is solved.

The invention discloses a double-gate graphene transistor with a silicon substrate and an aluminium oxide gate dielectric, and a preparation method, which are mainly used for solving the problems of low channel carrier mobility and carrier scattering of a graphene transistor prepared by the prior art. The preparation method comprises the following realization steps of: depositing a layer of Al2O3 on an epitaxial 3C-SiC surface on a Si substrate, and photoetching a double-gate graph; placing the etched sample in a quartz tube, generating a carbon film by reacting Cl2 with SiC, then placing the carbon film sample in Ar gas and annealing to generate graphene; etching off Al2O3 at the both sides of the graphene sample and 60-400 nm away from a conductive channel to form a double-gate groove; finally depositing a metal layer on the graphene sample and etching to form transistor metal contact. The double-gate graphene transistor provided by the preparation method disclosed by the invention has the advantages of being high in carrier mobility, good in scattering effect suppression performance, and capable of regulating a channel carrier concentration, as well as can be used for producing a large-scale integrated circuit.