13results about How to "Improve modulation efficiency" patented technology

The invention relates to a high-modulation-efficiency phase modulator based on a silicon nitride-lithium niobate waveguide. The modulator comprises an optical transmission unit and an electric transmission unit, the optical transmission unit comprises a quartz substrate layer, a silicon dioxide buffer layer arranged above the quartz substrate layer, a composite waveguide arranged above the middle position of the silicon dioxide buffer layer, and a silicon dioxide cladding covering the outer side of the composite waveguide; the electric transmission unit comprises a metal traveling wave electrode, and the metal traveling wave electrode adopts an embedded double-layer capacitor microstructure load traveling wave electrode. By optimizing the design of the electrode structure and the waveguide structure, the modulation efficiency is remarkably improved, broadband response and low optical loss are considered at the same time, and the device is suitable for application scenes sensitive to phase modulation efficiency and power consumption, such as high-speed optical fiber communication, coherent optical transmission systems, optical phased arrays and quantum optical experiments.

The invention discloses a high-speed electro-optical modulator based on a heterogeneous integrated waveguide and a preparation method thereof, and belongs to the technical field of planar optical waveguide optical modulators and preparation thereof. The sensor is composed of a silicon substrate, a silicon dioxide oxide layer, a lead zirconate titanate flat plate layer, a polymer flat plate layer, a first grounding electrode, a signal electrode, a second grounding electrode and a polymer strip-shaped layer from bottom to top in sequence. The polymer strip-shaped layer and the polymer flat plate layer are made of the same material, and the refractive index of the polymer strip-shaped layer is lower than that of the lead zirconate titanate flat plate layer. The polymer flat plate layer prevents direct contact between lead zirconate titanate and the electrode, so that the loss of the modulator is greatly reduced. When an electric field is externally applied, the electric field is uniformly distributed between the signal electrode and the grounding electrode, and the thickness of the polymer flat plate layer and the size of the polymer strip-shaped layer are designed, so that more light fields are controlled in the lead zirconate titanate flat plate layer, and the electro-optical modulation efficiency is further improved. The manufacturing process is simplified, and the method has the advantages of low production cost, high efficiency and the like.

The application provides a vertical resonant MEMS electric field sensor based on GIS-SOI-GOS, which is composed of GIS layer, SOI layer and GOS layer. The GIS layer comprises an upper driving electrode, an insulating ring, conductive silicon, a plurality of through holes and a groove on a glass layer, and the upper driving electrode is insulated from the conductive silicon through the insulating ring. The SOI layer is composed of a device layer, a buried oxygen layer and a substrate layer, the device layer is provided with a lower driving electrode, a shielding electrode, an induction electrode, an elastic beam and an anchor point, and the buried oxygen layer and the substrate layer are etched to have a hollow window, which together with the groove on the glass layer below the GIS provides a vertical vibration space for a movable structure. The GOS layer comprises an electric field induction cover plate and a glass layer provided with a window, and is used to establish an electric field induction channel. The application realizes integrated wafer-level preparation of a sensitive structure and vacuum packaging of the vertical resonant MEMS electric field sensor, and has the characteristics of high electric field induction efficiency, high quality factor, low driving voltage and the like.

The application provides a Mach-Zehnder electro-optical modulator and a modulation method. The modulator comprises a silicon substrate layer, a first silicon dioxide layer is arranged on the silicon substrate layer, a first coplanar waveguide electrode is embedded in the first silicon dioxide layer, a waveguide layer is arranged on the first silicon dioxide layer, and the first coplanar waveguide electrode and the waveguide layer are in contact. A second coplanar waveguide electrode is arranged on the surface of the waveguide layer away from the first silicon dioxide layer, and a second silicon dioxide layer is coated in the gap formed by the waveguide layer and the second coplanar waveguide electrode. The first coplanar waveguide electrode and the second coplanar waveguide electrode are supplied with voltage signals of the same frequency and the same phase.

This invention discloses a bit-loading-based HPLC signal processing method, belonging to the field of power line carrier communication technology. The bit-loading-based HPLC signal processing method includes: reading bit data from a channel interleaving module and sequentially writing it into a first bit buffer queue according to a preset number of bits to be read from the channel interleaving module; in bit-loading mode, determining the target number of bits to be filled for each subcarrier based on the modulation scheme corresponding to each subcarrier; different modulation schemes correspond to different target bit numbers; sequentially reading the target number of bits from the first bit buffer queue according to the writing order, and mapping the read-out bit data to the corresponding subcarrier for modulation and transmission. This invention achieves efficient rate matching for data processing in bit-loading mode and data transmission without subcarriers crossing physical blocks.

The application provides a service data transmission method, device, equipment and medium. In the method, after receiving a service data sending request, if it is judged that whether the modulation and coding strategy indication is allowed to be changed, it is indicated that the current node device can select the modulation and coding strategy, and then the target modulation and coding strategy level is determined according to the stored transmission information table, and the service data is sent according to the modulation and coding strategy corresponding to the target modulation and coding strategy level. According to the present application, the target modulation and coding strategy level is determined according to the transmission information table, and the service data is sent according to the modulation and coding strategy corresponding to the target modulation and coding strategy level, so that the current node device can send the service data at a faster modulation efficiency, and the modulation efficiency is effectively improved.

The embodiment of the invention provides an electro-optical modulator, a photon chip and a light quantum computer. The electro-optical modulator comprises a grounding electrode assembly and a signal electrode assembly. The ground electrode assembly includes a first ground electrode and a second ground electrode. The signal electrode assembly is located between the first ground electrode and the second ground electrode. The signal electrode assembly includes a positive signal electrode and a negative signal electrode. The signal electrode assembly is provided with the groove, equivalently, the current path of microwaves is prolonged, the distributed inductance of a transmission line is increased, the microwave speed is reduced, speed matching is more effectively achieved, the large distributed inductance is beneficial to increasing the characteristic impedance of the electrode, impedance matching is achieved, the reflection coefficient of radio-frequency signals is reduced, and the transmission efficiency of the radio-frequency signals is improved. Flat frequency response and higher effective driving voltage are obtained, and bandwidth and modulation efficiency are improved. The overall width of the signal electrode assembly does not change obviously, so that the transmission quality and stability of the system are ensured.

The embodiment of the present disclosure provides an electro-optical modulator and an optical quantum computer. The electro-optical modulator comprises an electrode assembly and an optical waveguide assembly. The electrode assembly comprises a positive signal electrode, a negative signal electrode, a first ground electrode and a second ground electrode, and the positive signal electrode and the negative signal electrode are arranged between the first ground electrode and the second ground electrode. The optical waveguide assembly is configured to carry an optical signal, and comprises a first optical waveguide and a second optical waveguide. The first optical waveguide is located between the positive signal electrode and the negative signal electrode and is used to carry a first optical signal. The second optical waveguide is located between the first ground electrode and the positive signal electrode or between the second ground electrode and the negative signal electrode and is used to carry a second optical signal. The application of equal-amplitude voltage signals with opposite phases to the closely coupled positive signal electrode and the negative signal electrode helps to improve the modulation efficiency and reduce common-mode noise.

The application discloses a biomolecule detection method and device based on water plowing effect and application thereof, and belongs to the technical field of biology. The method comprises the following steps: introducing a liquid sample to be detected into a micro-nano flow channel, the inner wall surface of which is decorated with specific recognition molecules for target biomolecules, so that the liquid sample to be detected flows in the micro-nano flow channel and generates a water plowing electric signal; collecting the water plowing electric signal; and judging whether the target biomolecules are contained in the liquid sample to be detected according to the change of the water plowing electric signal. The detection process of the application does not depend on fluorescence, enzymes or other markers, and does not involve complex biochemical reaction steps. The detection signal is generated by the liquid flow itself, and an external excitation power source is not needed, so that the target biomolecules can be rapidly detected.

The invention discloses an electro-optical modulator and a preparation method thereof. The electro-optical modulator comprises an electro-optical material film wafer; the covering belt is arranged on the upper surface of the electro-optical material film wafer and is used for restraining a transverse electric mode; the traveling wave electrodes are arranged on the upper surface of the electro-optical material film wafer and located on the two sides of the covering belt. According to the invention, the preparation of the high-performance electro-optical modulator on the non-etching electro-optical material film is realized.

The application discloses an arbitrary focal field energy flow regulation method and system for microparticle manipulation, which comprises the following steps: firstly, defining the complex amplitude distribution of the incident plane vector light field according to the preset manipulation requirement of the microparticle; then, encoding the complex amplitude distribution to a phase type spatial light modulator, and then synthesizing the incident plane vector light field; focusing the synthesized incident plane vector light field to a high numerical aperture objective lens; using the vector diffraction integral, mapping the incident plane vector light field to the focal domain electric field distribution according to the mapping relationship between the numerical aperture of the objective lens and the incident plane coordinates and the objective lens angle coordinates; calculating the three-dimensional energy flow vector distribution of the focal domain according to the focal domain electric field distribution; adjusting the complex amplitude distribution to change the topological structure and spatial scale of the three-dimensional energy flow vector distribution of the focal domain; and placing the microparticle to be manipulated in the focal domain, so that the microparticle realizes the preset capture, transportation, rotation or multi-position arrangement manipulation under the action of the optical force generated by the local energy flow.

This invention provides a thermo-optical phase shifter array and its formation method, comprising: forming multiple waveguides, wherein the multiple waveguides have the same length in a first direction and the same width in a second direction, and the first and second directions are perpendicular to each other; forming electrodes on the surface of each waveguide, wherein the area of ​​the multiple electrodes on the plane formed by the first and second directions gradually increases along the second direction; forming a dielectric layer on the surface of each electrode, the dielectric layer filling the gaps between adjacent electrodes and adjacent waveguides; forming isolation trenches in the dielectric layer and buried oxide layer on both sides of each waveguide along the second direction and in the underlying silicon layer below each waveguide, wherein the waveguides and the buried oxide layer below the waveguides are suspended on the isolation trenches, and the area of ​​the multiple isolation trenches located below the waveguides on the plane formed by the first and second directions gradually decreases along the second direction. This invention achieves a balance between modulation rate and modulation efficiency while satisfying the phase shift requirement.

The invention discloses a silicon dioxide-silicon nitride-lead zirconate titanate hybrid waveguide electro-optical modulator, and belongs to the technical field of optical modulators. The electro-optical modulator is composed of a silicon-based substrate, a lower wrapping layer, an optical waveguide core layer, a spacing layer and a metal electrode from bottom to top in sequence. The optical waveguide core layer is wrapped between the lower wrapping layer and the spacing layer, adopts a loaded strip-shaped waveguide structure and is composed of a flat-plate-shaped lower optical waveguide core layer and a strip-shaped upper optical waveguide core layer; the strip-shaped upper optical waveguide core layer is of an MZI type structure and is composed of an input straight waveguide, a 1 * 2 input multi-mode interference coupler, a first input S bent waveguide, a second input S bent waveguide, a first modulation straight waveguide, a second modulation straight waveguide, a first output S bent waveguide, a second output S bent waveguide, a 2 * 1 output multi-mode interference coupler and an output straight waveguide. According to the invention, the high-speed electro-optical modulator with a silicon dioxide-silicon nitride-lead zirconate titanate mixed waveguide structure, which has low loss and high modulation efficiency, is finally obtained.