8 results about "Multimode waveguides" patented technology

This invention discloses an optical and millimeter-wave radar composite detection system and method based on a multi-mode feed, relating to the field of detection and guidance technology. The invention is based on a highly integrated active feed module front-end architecture that integrates multi-mode radiating waveguides with magic T-junctions and T-sections to utilize TE10 primary mode and TE20 differential mode for beamforming. Combined with multi-mode waveguide coupling for multi-path calibration and the design of RF cables running along the support frame, this invention significantly reduces the complexity of the feed network, greatly shrinks the system size while maintaining structural symmetry, and significantly reduces the transmission loss of millimeter waves from the antenna to the transceiver components. This improves the system's millimeter-wave detection power and sum-difference slope performance, and effectively avoids additional obstruction to the common-aperture optical system.

The application provides an optical multimode interference coupler. The optical multimode interference coupler of the application directly connects a transmission waveguide with a slit structure and a bar-shaped multimode waveguide at an interface, and based on multimode excitation principle and self-imaging principle of the multimode interference coupler, the optical signal in the bar-shaped multimode waveguide is simultaneously split and the waveguide structure is converted at the interface in the slit single-mode waveguide, without using a traditional tapered bar-slit waveguide conversion structure, so that the length of the electronic component is effectively reduced and the integration of the component is improved. The application realizes that the input optical signal can be directly and evenly divided into two slit waveguides from the bar-shaped waveguide, without using a traditional combination structure of splitting light first and then converting. The device has the advantages of small size, low loss, high bandwidth and the like.

The application discloses a power-split high-order mode-passing filter based on a genetic heuristic direct binary search method reverse design and a design method thereof, and belongs to the field of silicon-based photonic integrated devices. The device comprises an SOI substrate, an input multimode waveguide, two output multimode waveguides and a silicon / air binary pixelated optimization region located therebetween. The pixel state distribution is determined through a genetic algorithm and a direct binary search algorithm, so that the TE0 mode is suppressed, the TE1 mode is passed and distributed to the two output multimode waveguides, and high-order mode-passing and 1x2 power splitting are integrated. The structure is compact in size, good in process compatibility and suitable for mode division multiplexing and on-chip optical interconnection systems.

An antenna for omnidirectional coverage and directional beam forming includes a multimode biconical waveguide with a first conical structure having a first base and a first apex, a second conical structure having a second base and a second apex, the first apex facing the second apex, and a radiation aperture. There is a coaxial interface between the first conical structure and the second conical structure that includes a coaxial waveguide to direct electromagnetic (EM) energy into the radiation aperture. An active electronic phased array (ASEA) included with the antenna controls independent sources of EM wave energy that excite multiple modes of the multimode biconical waveguide and provide omnidirectional radiation and directional beam steering.

A free-space optical telecommunication system includes a telescope having an objective lens for collecting incident light radiation and producing, at an optical port, a first light radiation; an optical processing device and at least one polarization-maintaining multimode waveguide having a first end coupled to the optical port of the telescope and a second end coupled to the optical processing device.

The application discloses a kind of computing spectrometer and spectral reconstruction method based on random multimode waveguide grating.It includes silicon substrate layer, silicon dioxide buried oxygen layer, lithium niobate waveguide layer, silicon dioxide coating layer and interdigital electrode arranged in turn from bottom to top.The lithium niobate waveguide layer is formed with mode multiplexer, multimode waveguide spiral and multimode waveguide grating, the mode multiplexer and multimode waveguide spiral are communicated, the multimode waveguide spiral includes at least one multimode straight waveguide, and the multimode straight waveguide is provided with a plurality of non-periodically distributed multimode waveguide gratings, each multimode waveguide grating unit adopts Bragg grating structure, and each multimode waveguide grating unit includes two groups of grating tooth structures located on both sides of the multimode straight waveguide.The application can simplify the electrical control logic, and the unordered resonance of different modes in the spiral can provide high spectral reconstruction resolution, and lithium niobate electro-optic modulation can realize fast and low-power measurement channel scanning.

An optical switch includes an input splitter, a phase shift section, and an output combiner. The input splitter splits a first optical signal input into a first single mode input onto first and second multimode outputs and splits a second optical signal input into a second single mode input onto the first and second multimode outputs. The phase shift section has a phase shifter and first and second multimode waveguides coupled with the first and second multimode outputs, respectively. The phase shifter selectively causes a multimode optical signal within the first multimode waveguide to undergo a phase shift relative to a multimode optical signal within the second multimode waveguide. The multimode optical signals each include portions of the first and second optical signals. The output combiner receives the multimode optical signals and recombines the first and second optical signals onto first and second single mode outputs, respectively.

An integrated asymmetric metasurface that simultaneously achieves broadband, low-loss forward power transmission, and back reflection suppression in a tapered multi-mode waveguide. The geometric asymmetry between the bilayers leads to low-loss conversion from the fundamental to high-order modes. Enhanced by a double-flipped structure, a thin metasurface can simultaneously achieve high conversion efficiency (>80%), and back-reflection efficiency of 90% over a 200 nm wavelength range.