51 results about "Multimode waveguides" patented technology

The invention discloses a polarization insensitive filter based on a sub-wavelength grating structure, and belongs to the technical field of integrated photonic devices. The filter comprises an input transition waveguide, a multimode waveguide grating and an output transition waveguide which are connected in sequence. The multimode waveguide grating is composed of a central sub-wavelength grating waveguide and Bragg gratings symmetrically distributed on the two sides, and the effective refractive indexes of TE polarization and TM polarization are equal by adjusting the waveguide width and duty ratio of the central sub-wavelength grating, so that the polarization sensitivity of the device is eliminated fundamentally. And the input / output transition waveguide adopts a transition mode of mixing a tapered waveguide and a sub-wavelength grating waveguide, so that low-loss mode transmission between a straight waveguide and a multimode grating is realized. According to the invention, the anisotropic equivalent medium characteristic of the sub-wavelength grating is utilized, a function of simultaneously and effectively filtering TE and TM polarization is realized, and the filter has the advantages of polarization insensitivity, flexible design, compact structure, simple process and compatibility with a CMOS (Complementary Metal Oxide Semiconductor) process, and has important application value in the fields of optical communication, optical interconnection and the like.

The invention relates to a micro-ring resonator based on a multi-circle square structure, the micro-ring resonator comprises a coupling waveguide and a multi-circle square micro-ring resonant cavity, the coupling waveguide comprises an S-bend waveguide, an input waveguide and an output waveguide which are all single-mode waveguides, and the multi-circle square micro-ring resonant cavity comprises a crossed waveguide chain and a multi-mode waveguide section connected with the crossed waveguide chain. The multi-mode waveguide section comprises a multi-mode straight waveguide and a 90-degree multi-mode Euler bending waveguide. By introducing the multi-mode waveguide, the energy distribution of the guided mode on the side wall is reduced, and the transmission loss of the micro-ring resonant cavity is reduced. Through the arrangement of the multi-circle square micro-ring resonant cavity, the length of the micro-ring is increased within a limited size, and the Q value of the multi-circle square micro-ring resonant cavity is improved. By means of the 90-degree multimode Euler bending waveguide, compact 90-degree turning is achieved, generation of a high-order mode is restrained, and meanwhile the micro-ring surrounding area is increased. Therefore, a solution can be provided for the high-performance sensing unit for the integrated micro-ring sensor.

The invention provides a series of polarization-independent beam splitters, a decoding end, a quantum key distribution system and a communication method, which can be applied to the technical field of quantum communication. The polarization independent beam splitter comprises an input optical channel, an input adiabatic evolution waveguide, a variable-width multimode waveguide, an output adiabatic evolution waveguide and an output optical channel, the variable-width multimode waveguide is in a strip shape and comprises a first end and a second end opposite to the first end, multiple waveguide sections with different width value changes are arranged between the first end and the second end, and the variable-width multimode waveguide is arranged between the first end and the second end. The signal photons are subjected to light field evolution in multiple waveguide sections with variable width values and then are subjected to beam splitting at a second end, and first beam splitting signal photons and second beam splitting signal photons are obtained; the length of the variable-width multimode waveguide is combined with different width values, so that the value of a target function is smaller than a target threshold value, and any beam splitting ratio can be realized on the premise of ensuring polarization independence through the combined asymmetric design.

An optical device includes a transition unit in which a first waveguide and a second waveguide are disposed in an overlapped manner such that a magnitude relationship of an effective refractive index between the vertical modes propagating the first waveguide and the vertical modes propagating the second waveguide is inverted at the positions of input and output. The transition unit allows, at the input, the second waveguide to be a single mode waveguide and allows, at the output, the second waveguide to be a multi-mode waveguide through which TM0 light in the maximum vertical mode and light in a higher-order mode propagate. The optical device includes a removing unit that allows the second waveguide to be a single mode waveguide through which the TM0 light propagates by removing the light in the higher-order mode from the light received from the transition unit.

In at least one embodiment, the optoelectronic semiconductor device comprises a carrier, a first semiconductor laser configured to emit a first laser radiation and applied on the carrier, and a multi-mode waveguide configured to guide the first laser radiation and also applied on the carrier, wherein the multi-mode waveguide comprises at least one furcation and a plurality of branches connected by the at least one furcation.

The utility model discloses a composite multimode waveguide structure, which belongs to the technical field of optoelectronic devices and comprises a plasmon unit made of a metal material or a material with a negative real part dielectric function. The plasmon unit is structurally characterized by comprising nanoparticles, nanowires, nanopore arrays or gradient structures; the dielectric waveguide is made of a semiconductor material with a high refractive index, and the dielectric waveguide is designed to be one of a strip-shaped waveguide, a ridge-shaped waveguide or a slit waveguide; and the substrate layer is located below the plasmon unit and the dielectric waveguide and comprises at least one low-refractive-index supporting layer, and the material system of the low-refractive-index supporting layer is one of an oxide material, a nitride material, a fluoride material or a composite substrate structure. According to the scheme, the contradiction of a plasma device and silicon photonics among mode degree of freedom, loss and process compatibility is solved.

Systems and methods are provided for designing and fabricating a multi-mode waveguide, such as a waveguide incorporated in a Multi-Mode Interferometer (MMI) device having at least one multi-mode waveguide. According to one implementation, a multi-mode waveguide includes one or more side boundary sections that are non-parallel to a propagation axis of the multi-mode waveguide. In another implementation, a multi-mode waveguide having a propagation axis extending therethrough includes a top planar boundary parallel to the propagation axis and a bottom planar boundary parallel to the propagation axis. Furthermore, the multi-mode waveguide includes a first side boundary having at least one section that is non-parallel to the propagation axis with deviations in geometric features associated therewith. Such deviations are selected based on one or more performance metrics, for improvement thereof.

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 invention provides an optical multimode interference coupler. According to the optical multi-mode interference coupler, the transmission waveguide of the slit structure is directly connected with the interface of the strip-shaped multi-mode waveguide, and based on the multi-mode excitation principle and the self-imaging principle of the multi-mode interference coupler, optical signals in the strip-shaped multi-mode waveguide are located at the interface in the slit single-mode waveguide; light splitting in the waveguide and transformation of a waveguide structure are completed at the same time, a traditional gradual deformation strip slit waveguide conversion structure does not need to be used, the length of an electronic component is effectively reduced, and the integration level of the device is improved. According to the invention, an input optical signal can be directly and equally divided into the two slit waveguides from the strip-shaped waveguide, and a traditional combined structure of first light splitting and then conversion is not needed. And the device has the advantages of small size, low loss, high bandwidth and the like.

The application discloses a waveguide lens type light beam scanning and control method, which is realized based on a waveguide lens type light beam scanning and control device; the device comprises an input waveguide, a multimode waveguide and a plurality of strip electrodes arranged around the multimode waveguide; the input waveguide and the multimode waveguide are arranged along a direction x in sequence, the input waveguide is connected with an input end of the multimode waveguide, and an output end of the multimode waveguide is in contact with air; when the multimode waveguide is a two-dimensional multimode waveguide, the electrodes are arranged around the multimode waveguide, arranged in cascade along the direction x, and arranged in interval along a direction y perpendicular to the direction x; when the multimode waveguide is a three-dimensional multimode waveguide, the electrodes are further arranged in interval along a direction z perpendicular to the directions x and y; when the position of an input light source is unchanged, the continuous adjustment of the output position, angle and spot size of the light beam is realized by changing the position of the electrodes relative to the light source and the heating power of the electrodes. The application can flexibly and continuously regulate and control the output position, angle and output spot size of the light beam.

This invention relates to the field of micro-nano optoelectronic device technology, specifically to a multi-stage end-face coupler for interconnecting optical fibers and on-chip photonic integrated devices, comprising a 3×2 multimode interference coupler, a connecting single-mode waveguide, and a 2×1 multimode interference coupler; the 3×2 multimode interference coupler includes three input tapered waveguides, a first multimode waveguide, and a dual-output tapered waveguide connected in sequence; the 2×1 multimode interference coupler includes a dual-input tapered waveguide, a second multimode waveguide, a single-output tapered waveguide, and a single-mode waveguide connected in sequence; the middle input tapered waveguide and the side input tapered waveguides are symmetrically distributed along the optical axis, and the first and second multimode waveguides include an interference region and a transition region, the width of which narrows along the direction of light propagation; this invention can reduce the transmission loss of the end-face coupler, increase the alignment tolerance, and reduce the fabrication difficulty.

The photoelectric device of multimode demultiplexing spectrometer and spectral reconstruction method relate to mode division (demultiplexing) spectroscopy. The photoelectric device is composed of a plurality of photoelectric detectors in cascade, each of which includes an SOI substrate, a silicon oxide layer, a multimode waveguide with two side branches, a two-dimensional material absorber and a metal electrode. The spectral reconstruction method includes a single-mode spectral reconstruction method, a single-sample multimode reconstruction algorithm and a multi-sample resolution enhancement reconstruction method. Different spectral information is modulated on different waveguide modes, then input into the multimode demultiplexing spectrometer, and a photocurrent is generated on each photoelectric detector. By using the spectral reconstruction method, single-mode spectral reconstruction under single sample, one-time multimode mixed spectral reconstruction and resolution enhancement spectral reconstruction under multi-sample are realized. The multimode demultiplexing spectrometer can simultaneously realize mode demultiplexing function and spectral detection capability, greatly reducing the complexity of the wavelength-division-mode-division hybrid multiplexing system.

An optical system includes a multimode waveguide having a non-circular cross-sectional core for transmitting light and a lens optically coupled to the multimode waveguide. The lens directs light from one or more point sources into the multimode waveguide so that the light is transmitted in one or more modes of the multimode waveguide. After transmission, the light is detected at one or more detectable points. In some cases, a back-end lens is configured to receive light output from the multimode waveguide. The back-end lens directs the light to one or more detectable points. In some cases, the front-end lens directs light from two or more point sources to the multimode waveguide at different angles with respect to a propagation axis of the multimode waveguide so that the light is transmitted via two or more different modes of the multimode waveguide, respectively.

An optical transceiver includes optical circuitry disposed on a substrate and comprising a transmitter and a receiver. The circuitry includes least one multi-mode interferometer (MMI), including a multi-mode waveguide comprising an input face and an output face, the input and output faces being bisected by a longitudinal axis, the multi-mode waveguide having a predefined width transverse to the longitudinal axis. Ports are coupled to respective waveguides and are configured to launch one or more input beams through the input face and receive one or more output beams from the output face. The ports include, on at least one of the faces, two or more ports at respective locations that are offset transversely from the longitudinal axis by at least λ0 / 300 from respective base transverse displacements that are equal to integer fractions of the width.

The multimode waveguide coupler comprises a first rectangular waveguide and a second rectangular waveguide which are arranged in parallel, metal walls are arranged at the two ends, located in the length direction, between the first rectangular waveguide and the second rectangular waveguide, a metal column is arranged in the middle, located in the length direction, between the first rectangular waveguide and the second rectangular waveguide, and gaps are formed between the metal walls and the metal column. According to the multimode waveguide coupler capable of using the multifunctional feed network, 3dB coupling of multiple field modes is achieved through a single physical structure on the basis that the advantages of low loss and high power capacity of waveguides are reserved, and therefore the number of devices is effectively reduced, the feed network is simplified, and the integration level and the adaptive capacity of a millimeter wave system are improved.

The application discloses an FP cavity electro-optic modulator array which can be used for a multi-wavelength channel transmitter. The modulator array is mainly formed by sequentially connecting N modulator units; a single modulator unit comprises a 2*2 Fabry-Perot cavity structure, a substrate and a pair of modulation electrodes, the 2*2 Fabry-Perot cavity structure and the modulation electrodes are arranged on the upper surface of the substrate, the two modulation electrodes are symmetrically distributed on the two sides of the 2*2 Fabry-Perot cavity structure, the multiplexing end of a first mode demultiplexer is connected with the input end of an anti-symmetrical multimode waveguide grating, the two anti-symmetrical multimode waveguide gratings are connected through an intermediate waveguide, and the output end of the other anti-symmetrical multimode waveguide grating is connected with the multiplexing end of the first mode demultiplexer. The application has the advantages of compact structure, excellent electro-optic modulation performance of the modulator unit, large modulation bandwidth, flexible cascade mode, can be used for the multi-wavelength channel transmitter, and is suitable for being applied to large-capacity optical communication, optical calculation and the like.

The application discloses a polarization-independent electro-optical modulator based on a thin film lithium niobate multi-mode waveguide, which comprises a silicon substrate layer, a buried oxygen layer, a lithium niobate layer and a metal electrode on the lithium niobate layer. The X-cut thin film lithium niobate layer comprises input and output straight waveguides, input and output end mode converters, a multi-mode beam splitter, a multi-mode waveguide phase shift arm and a multi-mode beam combiner. When a TE0 mode is input from any input straight waveguide, the modulation principle is the same as that of a conventional Mach-Zehnder electro-optical modulator; the same transmission path as the TE0 mode, when a TM0 mode is input, the input end mode converter is used to convert the TM0 mode into a first-order transverse electric mode, i.e. a TE1 mode, the multi-mode beam splitter is used to realize 3dB beam splitting of the TE1 mode, the multi-mode waveguide phase shift arm is used for modulation, the multi-mode beam combiner is used for interference output, and finally the output end mode converter is used for conversion into a TM0 mode for output. The application effectively expands the application range of the electro-optical modulator and solves the modulation problem of different polarization modes of light.

The invention discloses a non-resonant recyclable integrated acousto-optic modulator which has a high-order controllable mode light modulation capability. According to the device, a lithium niobate-chalcogenide glass heterogeneous layer is constructed based on a silicon-silicon dioxide substrate, and the device comprises a lithium niobate film and a heterogeneous integrated chalcogenide waveguide. A multi-mode light field is formed through waveguide conical transition, and coupling of an annular loop and a multi-mode waveguide is realized by means of an asymmetric directional coupler, so that high-order mode light circulates in a modulation area, and multi-time modulation is realized. According to the structure, the modulation efficiency can be improved and the required microwave power can be reduced through a high-order mode on the premise that the interaction length is not increased. The device is compact in structure, simple in process and suitable for the fields of optical communication, photon calculation, signal processing and the like.

In an optical data transmission system, a beam modulator is configured to embed a data set into an input optical beam. A multimode optical waveguide network has an in-coupling region for receiving the input optical beam. The multimode optical waveguide network is configured to direct the input optical beam to an out-coupling region of the multimode optical waveguide network. A spatially coherent detector is configured to measure a phase and an amplitude of an output optical field at a plurality of locations. The output optical field is at least partially defined by the input optical beam and thus exhibits distortion effects caused by the propagation of the optical beam through the multimode waveguide network. Signal processing is applied to the output of the spatially coherent detector to compensate for the distortion effects, thereby recovering the data set embedded in the input optical beam from the output of the spatially coherent detector.

The present invention relates to a quantum processor according to claim 1 comprising a series of controllable modules for manipulation of a qudit, where : each controllable module for manipulation of a qudit comprises a multimodal waveguide ( 10 ) comprising a modulating geometric modification ( 24, 24a, 24b, 24c) localized on said waveguide, where the modulating geometric modification ( 24, 24a, 24b, 24c) is controllable to manipulate the modes of the qudit, the respective modulating geometric modifications ( 24a, 24b, 24c) of said modules are localized on the same waveguide in common between them, therefore called common waveguide ( 10 ), so that said modulating geometric modifications are in succession with one another; said plurality of controllable modulating geometric modifications ( 10 ) are phase shifters and are realized in series along said common waveguide, defining a path of at least one photon comprising a plurality of only geometric modifications modulating the phase variation, in succession with one another.

The invention belongs to the related technical field of optical communication and microwave photonics, and discloses a multimode waveguide-based high-Q-value micro-ring resonator, which comprises an annular waveguide, a bus waveguide, an input waveguide and an output waveguide, the annular waveguide comprises a first bent waveguide, a first straight waveguide, a second bent waveguide and a second straight waveguide which are sequentially connected end to end; the bus waveguide comprises a third bent waveguide, a fourth bent waveguide and a fifth bent waveguide which are connected in sequence; the input waveguide is connected with the third bent waveguide, and the output waveguide is connected with the fifth bent waveguide; the fourth bent waveguide and the first bent waveguide form a coupling region; the shapes of the first bent waveguide, the second bent waveguide and the fourth bent waveguide are all 180-degree curves; according to the invention, the curvature of the bent waveguide is controlled to continuously change along with the length range, so that the heat insulation transmission of the fundamental mode between the multimode straight waveguide and the bent waveguide is realized; and the size of the coupling region is greatly reduced, so that the size of the micro-ring resonator is not limited by the coupling region, and a higher integration level is realized.

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.

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.

The present invention provides an integrated device for wavelength correlation detection of light, the integrated device comprising: a light collecting element comprising a collecting end and a transmitting end and configured to collect light incident at the collecting end and collect the light at the transmitting end; and a multimode waveguide forming an extension from the receiving end to the distribution end and surrounded by the primary medium along the extension, where the transmission end is coupled to the receiving end, the waveguide configured to receive light from the light condensing element at the receiving end, where the waveguide and the primary medium are configured to propagate light to form a light pattern at the distribution end, the distribution of the light pattern across the distribution end depends on the wavelength of the light; and a plurality of photosensitive elements arranged such that different photosensitive elements receive different portions of the light pattern at the distribution end for wavelength correlation detection of the light.

The application discloses a high-efficiency optical waveguide chip-few-mode fiber coupler. The coupler comprises a few-mode fiber-multimode waveguide mode spot conversion module on a low-contrast conversion chip, a polarization-insensitive mode multiplexing / demultiplexing module, a low-high-contrast waveguide mode spot conversion module and a polarization control module on a high-contrast chip. 2n linear polarization modes of the few-mode fiber are coupled into a multimode waveguide through the end face of the few-mode fiber-multimode waveguide mode spot conversion module, and then are demultiplexed into n base modes through the mode multiplexing / demultiplexing module, and then are coupled into n high-contrast waveguides through the low-high-contrast waveguide mode spot conversion module to obtain TE0 / TM0 mode pairs, and finally are divided into 2n linear polarization modes of the high-contrast waveguide through the polarization control module. The application can realize high-efficiency coupling of linear polarization modes in the few-mode fiber and linear polarization modes in the high-contrast optical waveguide chip, has the advantages of large bandwidth, large tolerance, low crosstalk, semiconductor process compatibility and the like, and effectively solves the problem of multimode coupling from the optical fiber to the chip.

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.

The invention provides a silicon-based integrated multimode optical switch and an optical channel switching method. The optical switch comprises an arbitrary mode-dual mode conversion module, a first-order mode demultiplexing module and a high-order mode multiplexing module, wherein the arbitrary mode-dual mode conversion module is formed by sequentially connecting a mode separation unit, a thermal optical phase shift unit and a mode combination unit through single-mode waveguides; the first-order mode demultiplexing module is used for signal routing; and the high-order mode multiplexing module is used for recovering routing signals to a required high-order mode. The arbitrary mode-dual mode conversion module, the first-order mode demultiplexing module and the high-order mode multiplexing module are sequentially connected through matched waveguides; wherein the mode separation unit is composed of three-core coupling waveguides, the middle is a multi-mode waveguide, and the two sides are single-mode waveguides; the mode combination unit is a Y-shaped branch waveguide assisted by a sub-wavelength grating, and the first-order mode demultiplexing module and the high-order mode multiplexing module are each composed of a dual-core (a multi-mode waveguide and a single-mode waveguide) coupling waveguide. The optical switch architecture has the advantages of compact structure, high expansibility, low loss, low manufacturing difficulty, relatively low price and the like.

The invention provides an integrated photon neural mimicry computing chip based on mode division multiplexing, which comprises a multi-mode photon synapse array which comprises N * N multi-mode photon synapses arranged in an array mode, two adjacent multi-mode photon synapses arranged along a row, a first multi-mode photon synapse and a second multi-mode photon synapse arranged along a column, single-mode waveguides of the multi-mode photon synapses are connected, and single-mode waveguides of the multi-mode photon synapses are connected with single-mode waveguides of the multi-mode photon synapses; multimode waveguides of the second to Nth multimode photon synapses arranged along the column are connected; and N multi-mode photonic neurons connected with the last multi-mode waveguide of the corresponding column. According to the invention, a brand new mode division multiplexing integrated photon neural mimicry computing architecture is provided, the limitation of space stacking of a traditional single-mode device is broken through, and the optical parallel computing and neuron activation capability is really expanded by using a mode division multiplexing technology.

The application discloses a kind of multi-port interferometer and split-amplitude polarization detector, belong to integrated photonic device field, multi-port interferometer includes multimode waveguide, two input ports and M output ports, etching has round hole on the multimode waveguide, wherein, M=4 or 6;With the same polarization state light is respectively input from the two input ports, after the regulation and interference of multimode waveguide, output M road light to different projection polarization state projection.The application also provides a kind of split-amplitude polarization detector, including light polarization beam splitter rotator, multi-port interferometer, M light detector and polarization state calculation module;The application can simultaneously reduce the volume of interferometer and polarization detector, reduce system complexity and improve integration.