32results about How to "Improve mode conversion efficiency" patented technology

The invention provides a mode multiplexing demultiplexer based on silicon-based optical waveguide mode matching. When the mode multiplexing demultiplexer is used as a multiplexer, the mode multiplexing demultiplexer comprises n strip-shaped waveguides different in width and adopted as input optical waveguides, wherein the 0-th input optical waveguide (10) is a single-mode optical waveguide and the tail end of the single-mode optical waveguide is sequentially connected with a conical optical waveguide (20), a multi-mode optical waveguide (30) and a multiplexer output end (40). The tail end of the n-th input optical waveguide (1n) is sequentially connected with an S-shaped curved optical waveguide structure (2n), a coupling region optical waveguide (3n), a second S-shaped curved optical waveguide structure (4n), a small-section straight waveguide (5n) and a conical waveguide (6n). When the mode multiplexing demultiplexer is used as a demultiplexer, the output end and the input end of the multiplexer are exchanged with each other according to the reversibility of the optical path. Therefore, the mode demultiplexing can be realized. In this way, the mode multiplexing demultiplexer becomes a demultiplexer. The mode multiplexing demultiplexer is simple in structure and high in mode conversion efficiency, which enables the multiplexing and the demultiplexing of the TE mode and the TM mode.

The invention discloses a blended crossing device for a silicon-based nanowire. The crossing device comprises two groove waveguide mode switching units, two slab waveguide mode switching units, a sine switching waveguide and a crossing multimode waveguide, wherein the two groove waveguide mode switching units and the two slab waveguide mode switching units are respectively connected through the sine switching waveguide and the crossing multimode waveguide, each groove waveguide mode switching unit is opposite to one slab waveguide mode switching unit, each groove waveguide mode switching unit comprises a groove waveguide for inputting an optical signal and a mode switcher, each mode switcher is connected between each groove waveguide and the sine switching waveguide, each slab waveguide mode switching unit comprises a slab waveguide and a single-mode waveguide for outputting the optical signal, and each single-mode waveguide is connected between each slab waveguide and the sine switching waveguide. The crossing device has the advantages of high transmission efficiency, compact structure, low loss, low manufacturing difficulty, relatively low cost and the like.

The invention relates to a mode exciter from a rectangular waveguide TE<10> mode to a round waveguide TE<21> mode and a design method. The work wavelength of the mode exciter is Lambda, and comprises rectangular waveguide and round waveguide; the rectangular waveguide comprises an input port and an output port; the round waveguide comprises a short circuit surface and an output port; the output port end of the rectangular waveguide is tipsily embedded into the round waveguide in a position with the distance being 1/4 work wavelength away from the short circuit surface, so that electromagnetic waves are transmitted to the output port of the round waveguide from the input port of the rectangular waveguide; the mode excitation on the round waveguide can be realized; the narrow edge of the rectangular waveguide is vertical to the axial line of the round waveguide; the center line of the rectangular waveguide and the axial line of the round waveguide form an included angle being theta; the length of the rectangular waveguide is 1 to 2 times of the work wavelength; and the length of the round waveguide is 5 to 7 times of the work wavelength. The mode exciter provided by the invention has the advantages that the structure is simple; and the work frequency band and the mode conversion efficiency can meet the requirement of the propagation characteristic measurement of the TE<21> mode in a gyro traveling wave tube high-frequency system.

The integration process of continuous self-aligning semiconductor photoelectronic device and mode spot converting includes the following steps: growing on substrate buffering InP layer, lower waveguide limiting InGaAsP layer, isolating InP layer, active area structure, thin upper limiting InGaAsP layer and protecting InP layer through organic chemical vapor deposition process, etching to form partial mode spot converter; growoing SiO2 through plasma vapor deposition process; photoetching active area and mode spot converter area; growing InGaAsP layer, P doped covering InP layer and protectingInGaAsP layer through selective metal organic vapor chemical deposition process, growing SiO2, photoetching mask heterojunction bar structure; growing p-n-p type InP current barrier layer through metal organic vapor chemical deposition process.

The invention discloses a broadband mode converter from a rectangular waveguide TE10 mode to a circular waveguide TE02 mode, and belongs to the technical field of microwave and millimeter wave devices. The design route adopted by the invention is the standard rectangular waveguide TE10 mode, a rectangular waveguide TE20 mode, a rectangular waveguide TE40 mode, a cross-shaped waveguide TE44 mode, across-shaped fan-shaped waveguide TE44 mode and the circular waveguide TE02 mode. According to the broadband mode converter from the rectangular waveguide TE10 mode to the circular waveguide TE02 mode, by changing the external shape of a waveguide, the boundary condition when an electromagnetic wave is propagated in the waveguide is changed, and the broadband mode conversion from the rectangularwaveguide TE10 mode of a linear gradient structure to the circular waveguide TE02 mode is realized by means of a transfer mode scheme. According to the mode converter, the problems of low mode conversion efficiency and narrower bandwidth are effectively solved, and each mode conversion section is of a linear gradient structure, so that the mode converter is simple in structure and high in practicability, and is convenient to process.

The invention discloses an optical fiber type broadband optical vortex converter. The converter comprises a single-mode optical fiber, a polarization controller acting on the single-mode optical fiber, a multimode optical fiber, a polarization controller acting on the multimode optical fiber, and a polarizer which is arranged at the output end of the multimode optical fiber; the output end of thesingle-mode optical fiber and the input end of the multimode optical fiber are in asymmetrical connection with each other, so that an optical vortex mode can be excited; the order of the optical vortex mode can be flexibly regulated by controlling the polarization controllers; and the working states of the polarization controllers and the polarizer can be jointly adjusted, so that remaining non-optical vortex components can be filtered out, and therefore, the purity of the optical vortex mode can be improved. The converter does not have a bandwidth-limiting structure, so that the working bandwidth of the converter is large. The optical fiber type broadband optical vortex converter of the invention can be realized by using asymmetrical welding and asymmetrical pasting, and therefore, the processing process of the converter is simple. Compared with a conventional vortex converter device, the optical fiber type broadband optical vortex converter of the invention has the advantages of significantly reduced processing difficulty, significantly reduced cost, improved working bandwidth and wide application prospect.

The invention discloses a rectangular waveguide radial power combiner. The rectangular waveguide radial power combiner has a broad frequency band, high efficiency and high power capacity. According tothe technical scheme, a mode converter is communicated with a power combination cavity in a disk through an S-tube double-bend circular waveguide in an S-shaped double-bend tube form from a waveguideport (4) at the bottom fixed end of the S-tube double-bend circular waveguide, and the free end of the S-tube double-bend circular waveguide is fixedly connected with a square window waveguide cavityof a cone-shaped waveguide; rectangular waveguide input ports are formed in a hollow platform of the disk, wherein the rectangular waveguide input ports are equally divided according to a circumferential angle, point to the power combination cavity and are radially distributed in an equal circular array around a center matching circular table; the mode converter converts a main TE<10> mode in a rectangular waveguide into a TM<01> mode in the S-tube double-bend circular waveguide, wherein an electric field has radial rotating characteristics in the TM01 mode; and through coupling of a main TE<10> mode in the power combination cavity and a main TE<10> mode in each radially-distributed rectangular waveguide input port channel, equiamplitude in-phase synthesis of all the input ports is completed finally.

The invention discloses a turnstile type phase shifter, and aims to provide a turnstile type phase shifter with a compact structure, a fast phase shifting speed, high precision and a large power capacity. The phase shifter comprises an arc diaphragm loaded circular polarizer and cross-shaped waveguide wire circular polarizer. The resonant cavity of the arc diaphragm loaded circular polarizer is aligned with the first circular waveguide of the cross-shaped waveguide wire circular polarizer. The arc diaphragm loaded circular polarizer consists of a coaxial waveguide, the resonant cavity, a balun structure, and metal diaphragms. The cross-shaped waveguide wire circular polarizer consists of a cross-shaped rectangular waveguide, a first circular waveguide, a second circular waveguide, a metal cylinder, and a metal hemisphere. The cross-shaped waveguide wire circular polarizer is a fixed one that does not move while the arc diaphragm loaded circular polarizer can rotate to its axis at any given angle that represents the phase shift of a TE10 mode. With the phase shifter of the invention, it is possible to achieve high mode conversion efficiency; with a compact structure, a good phase-shifting effect can be achieved at a high speed for the phase adjustment of a TE10 mode at will.

The invention belongs to the technical field of communication modes, and discloses a universal silicon-based integrated optical waveguide mode converter. The converter. includes an input waveguide, the input waveguide is connected with an input mode conversion module, the input mode conversion module is connected with one end of a middle connecting waveguide, the other end of the intermediate connection waveguide is connected with an output mode conversion module, the output module conversion module is connected with an output waveguide, the input waveguide is used for transmitting input lightwaves, the input mode conversion module is used for converting the mode of the input light waves into a fundamental mode, the intermediate connection waveguide is used for transmitting the light waves in the fundamental mode, the output mode conversion module is used for converting the light waves in the fundamental mode into a mode required by output light waves, and the output waveguide is usedfor transmitting the output light waves. The converter provided by the invention can realize conversion between any same polarization light field mode, and has better universality, flexibility and programming reconstruction capability.

The invention provides a liquid helium conveying system used for large-size multi-section liquid helium heat sinks and a class converting method for converting liquid nitrogen to liquid helium of the liquid helium heat sinks on the basis of the liquid helium conveying system. The liquid helium conveying system and the method are applied to an engine vacuum plume experimental study. The liquid helium conveying system comprises a heat sink system, a liquid nitrogen supplying system, a liquid helium supplying system, a nitrogen supplying system and a helium supplying system. The heat sink system comprises five large-size liquid helium heat sinks and four liquid nitrogen heat sinks. The liquid nitrogen supplying system is provided with conveying pipelines for the liquid helium heat sinks and the liquid nitrogen heat sinks, and provided with a liquid nitrogen cooling box and a liquid helium cooling box, wherein the liquid nitrogen cooling box and the liquid helium cooling box are used for centrally containing and managing liquid nitrogen adjusting valves and liquid helium adjusting valves. According to the liquid helium conveying system used for the large-size multi-section liquid helium heat sinks and the class converting method for the large-size multi-section liquid helium heat sinks, liquid helium refrigeration can be provided for the large-size multi-section liquid helium heat sinks at the same time, unified liquid supplying is achieved for all the heat sinks, operation is convenient, cost is saved, floor space is small, the valves can be centrally controlled conveniently, working efficiency is improved, and operation and maintenance are convenient.

The invention provides a TM0-TE1 optical mode converter based on a double-layer curve edge waveguide structure and an optical device, the mode converter is provided with a double-layer waveguide structure, each layer of waveguide comprises a plurality of key nodes of which the positions can be optimized, and the specific shape of the waveguide edge is determined through a quadratic or cubic spline interpolation method. The mode converter can convert a transverse magnetic fundamental mode, namely a TM0 mode, of an input waveguide into a first-order transverse electric mode, namely a TE1 mode, and meanwhile, the input transverse electric fundamental mode, namely the TE0 mode, is not changed. Compared with a traditional TM0-TE1 mode converter based on a double-layer linear gradient waveguide structure, the TM0-TE1 mode converter has the advantages that higher mode conversion efficiency can be obtained by optimizing denser key node parameters in a more compact size, meanwhile, the smoothness of the edge of the waveguide can be strictly guaranteed, and it is guaranteed that the technology can be used for preparing the TM0-TE1 mode converter.

The invention discloses an autonomic multi-mode management method, which comprises the following steps of: constructing a five-tuple representation mode comprising mode basic information, sub-mode information, target mode information, a mode trigger and a mode decider; deciding the mode ID of the current system operation by adopting a trigger mechanism; and finally, calculating the QoS level of each task group in the mode by adopting a two-stage multi-granularity decision model, and adjusting task scheduling parameters to complete task scheduling. The method improves the mode conversion efficiency of the system and enhances the environmental adaptability of the system.

The invention provides a mode controller from a multi-core optical fiber to an annular core optical fiber. The mode controller is composed of a multi-core optical fiber, a mode field conversion area, an annular core optical fiber and a phase modulation module, the multi-core optical fiber and the annular core optical fiber are connected through the mode field conversion area, and after transmission light passes through the phase modulation module to form a stable phase difference, the transmission light transmits in the multi-core optical fiber and is coupled to the annular core optical fiber through the mode field conversion area, so that a high-order mode of the annular core optical fiber can be excited, and different modes can be excited through different phase differences.

The invention provides a rectangular TE10 mode to round waveguide TE21 mode converter based on the H-T joint power division network. The mode conversion process is from a rectangular TE10 mode to a rectangular TE20 mode to a circular waveguide TE21 mode. The converter is characterized by comprising an input port, a main branch rectangular waveguide, an H-T joint, three matching steps, two sub branch rectangular waveguides, an over-mode rectangular waveguide, a rectangular-circular waveguide mode converter, an output circular waveguide and an output port. The converter is advantaged in that theproposed TE20-TE21 mode converter has excellent electrical performance and has high mode conversion efficiency (95%) over a wide frequency range. Due to utilizing the H-T power division network, an input port is coaxial with the center of an output port, integration of two-dimensional planar processing and its application systems is facilitated, and the TE20-TE21 mode converter proposed by the invention has excellent electrical performance and structural performance and can be used for cold chamber testing of the high frequency structure of a whirling traveling wave tube.