243 results about "Waveguide coupling" patented technology

An electronic device may include a waveguide that directs light to an eye box. The waveguide may include a diffractive grating structure. A projector may generate image light coupled into the waveguide by a first input coupler. A light source may generate supplemental light coupled into the waveguide by a second input coupler. The diffractive grating structure may couple the image light out of the waveguide within a central region of the field of view (FOV) of an eye box and may couple the supplemental light out of the waveguide at a location within a peripheral region of the FOV. The location may be outside of the central region by at least 10 degrees. A gaze tracking sensor may estimate a user's gaze direction at the eye box. A processor may wake or power down the projector responsive to the gaze direction overlapping the location for a predetermined time period.

A device useful as a switch including an input waveguide coupled to an output waveguide; a first diode circuit integrated with the input waveguide at a first termination; a second diode circuit integrated with the output waveguide at a second termination; and wherein the biasing the diode circuits switches the switch between an off state and an on state and achieves high isolation in the off state by absorbing input power in, reflecting the input power from, and frequency multiplying the input power using the diodes in the diodes circuits when the input power is received from the input waveguide. In one embodiment, the switch is a tunable, solid-state SPST switch for Gband radar applications.

The invention relates to an antenna device comprising a quad-ridged waveguide, an open end of which is configured to act as a radiating aperture, and an orthomode transducer, OMT, configured to couple the quad-ridged waveguide to two feed structures.

A waveguide to transmission line coupler is provided. The waveguide can be capable of guiding electromagnetic energy and can have a plurality of coupling sets along the waveguide. The coupling set can include a non-resonant coupling aperture capable of coupling said electromagnetic energy from the waveguide to at least one output transmission line and a tuning element in the waveguide proximate to said non-resonant coupling aperture thereto, capable of tuning out residual shunt susceptance corresponding to the electromagnetic energy coupled by said non-resonant coupling aperture.

An electronic device may include a display that generates light for an optical system that redirects the light towards an eye box. The optical system may include a waveguide, a non-diffractive input coupler, a cross coupler, and an output coupler. The cross coupler may expand the light in a first direction. The cross coupler may perform an even number of diffractions on the light and may couple the light back into the waveguide at an angle suitable for total internal reflection. The output coupler may expand the light in a second direction while coupling the light out of the waveguide. The cross coupler may include surface relief gratings or holographic gratings embedded within the waveguide or formed in a separate substrate. The optical system may direct the light towards the eye box without chromatic dispersion and while supporting an expanded field of view and optical bandwidth.

The application provides a leaky-wave antenna array based on a multimode substrate integrated waveguide coupler, relates to the technical fields of wireless communication and radar, and comprises a dielectric substrate, a multimode substrate integrated waveguide coupler and two leaky-wave antenna units. The multimode substrate integrated waveguide coupler is integrated on the dielectric substrate and is configured to excite modes and modes of the substrate integrated waveguide respectively in the same frequency range, generate even-mode signals with equal amplitude and in-phase and odd-mode signals with equal amplitude and opposite phase. The two leaky-wave antenna units are symmetrically arranged on the two sides of the upper surface metal layer of the dielectric substrate and are connected with two output ports of the multimode substrate integrated waveguide coupler respectively. The two leaky-wave antenna units are configured to radiate a wave beam and a difference wave beam in response to the even-mode signals and the odd-mode signals. The application solves the problem of low measurement accuracy of a traditional single-pulse antenna, has the technical effects of simplifying the design of a feed network, improving radiation performance and thus improving measurement accuracy.

According to the flexible waveguide coupling structure for the high-density optical engine and the miniaturized packaging method of the flexible waveguide coupling structure, the polymer optical waveguide is adopted, the waveguide core layer is made of the high-refractive-index material, and the refractive index of the core layer is higher than that of the upper cladding and the lower cladding, so that light beams can reflect light rays on the surface or in the core layer; the light beam is limited in the core layer to be transmitted along the set path; the flexible waveguide is used in high-density optical engine packaging, a traditional ribbon optical fiber array is directly replaced, and the contradiction between space limitation and bending radius is solved; comprising a flexible waveguide, an MT / MPO connector and a microlens array, polymers such as PMMA, BCB, SU-8, FPPE, PSQ, PDMS / M-PDMS and the like are selected as flexible waveguide materials, the thickness is smaller than or equal to 0.2 mm, the bendable radius is smaller than or equal to 2 mm, the core / cladding refractive index difference delta n is larger than or equal to 0.01, the multimode numerical aperture NA is approximately equal to 0.3, the transmission loss in a 850 nm window is smaller than or equal to 0.25 dB / cm, the angle of a coupling end face is 40-50 degrees, and the requirements for low loss and high bandwidth of short-distance parallel optical interconnection are met.

A metasurface structure for an antenna. The metasurface structure includes multiple subwavelength units operable to manipulate or control amplitude, phase, polarization, frequency, and momentum of electromagnetic waves for radiation. The metasurface structure may be operably coupled with a waveguide to provide a metasurface antenna. The metasurface structure or the metasurface antenna may be operably coupled with a controller arranged to control it.

The invention provides an III-V group and silicon-based waveguide bonding coupling structure design method and a laser. The method comprises the following steps: determining initial geometric parameters of a coupling region of an III-V group laser and a silicon-based waveguide; determining a maximum process alignment deviation range based on process historical data; establishing a three-dimensional simulation model on the basis of the initial geometric parameters, and performing offset correction on the position of the silicon-based waveguide in the bonding plane according to the maximum process alignment deviation range in a simulation environment; calculating the coupling efficiency after offset correction, and when the reduction of the coupling efficiency exceeds a preset threshold value, carrying out iterative optimization adjustment on the width of the silicon-based waveguide and the length of the transition region; the method comprises the steps that the silicon-based waveguide structure with the optimal coupling efficiency is finely adjusted again according to the maximum process deviation, offset correction and optimization adjustment are repeatedly executed till the coupling efficiency meets the design requirement under all the preset process deviation conditions, and coupling structure design parameters are output. Therefore, the design of the coupling region with robustness to process deviation is obtained.

A system includes two or more illuminators, each illuminator configured to provide excitation light. An excitation waveguide is coupled to each of the illuminators. Each of the excitation waveguides is configured to guide the excitation light from the coupled illuminator to a corresponding location, thereby illuminating at least a portion of the location with the excitation light. A combined-emission waveguide is configured to guide light emitted from the illuminated locations to detection optics. The detection optics include one or more lenses. The detection optics are configured to receive at least a portion of the emitted light provided from the combined-emission waveguide and direct at least a first portion of the received emitted light along a first detection path based on a first wavelength of the received emitted light.

This invention belongs to the field of wavelength division multiplexing optical communication technology, specifically relating to a reverse coupler based on a thin-film lithium niobate platform. The reverse coupler includes: a lithium niobate-on-insulator substrate, a first waveguide, a second waveguide, and a coupling region. The first and second waveguides are disposed in the device layer of the lithium niobate-on-insulator substrate. The first and second waveguides are arranged in parallel along the light propagation direction within the coupling region. A periodic grating perturbation structure is disposed on the first and / or second waveguides. This reverse coupler utilizes the grating perturbation structure to ensure that the modes of the two waveguides satisfy the phase matching condition. The optical signal input to one waveguide is reverse-coupled to the falling port of the other waveguide. Utilizing the large photoelectric coefficient of lithium niobate material, this reverse coupler can tune its spectrum under specific conditions by applying a voltage.

This invention relates to the field of smart antenna design technology, specifically to a multi-layer transparent antenna system based on a frequency selective surface (FSS). The system includes a transparent FSS interlayer, a dynamic impedance matching layer, a conformal waveguide coupling structure, a control module, and a receiving module signal-connected to the control module. The purpose of this invention is to provide a multi-layer transparent antenna system based on a frequency selective surface, characterized by high multi-band compatibility, dynamic environmental adaptability, high integration, and concealment.

The invention relates to a coupling structure for coupling electromagnetic waves into and / or out of a waveguide. The coupling structure comprises a substrate which comprises a pot-shaped, electrically hollow structure having an oval basic shape, wherein the electrically hollow structure is defined on one side of the substrate and is terminated on the opposite side of the substrate.

The invention discloses a dual-drive differential thin film barium titanate electro-optical modulator. Comprising a narrow linewidth laser, a first optical fiber waveguide coupling module, a second optical fiber waveguide coupling module, a first 1 * 2 optical beam splitter, a second 1 * 2 optical beam splitter, a first radio frequency module, a second radio frequency module, a GSGSG coplanar traveling wave electrode structure, a first waveguide and a second waveguide, wherein the GSGSG coplanar traveling wave electrode structure consists of a first ground electrode, a first signal electrode, a second ground electrode, a second signal electrode and a third ground electrode; the invention relates to an a-axis oriented barium titanate film and a substrate. After beam splitting, input laser is respectively injected into two parallel waveguides which are prepared on the barium titanate film and penetrate through the GSGSG structure. The first radio frequency module and the second radio frequency module apply composite modulation signals including direct current bias and differential radio frequency signals to the signal electrodes, so that the refractive indexes of the two waveguides have opposite sign changes to realize push-pull modulation, and modulated optical signals are output after beam combination. By means of the dual-drive differential and GSGSG electrode structure, the modulation efficiency is improved, and meanwhile the anti-interference capacity and stability of the device are remarkably improved.

The invention discloses a double-layer optical waveguide coupling type pressure sensor, which comprises a detection optical signal generation module, a pressure sensing unit and a detection signal processing module, and is characterized in that the detection optical signal generation module and the detection signal processing module are connected with the pressure sensing unit through optical fibers; the pressure sensing unit mainly comprises two layers of flat plates containing optical waveguides, and air or low-loss transparent liquid with a certain thickness clamped between the flat plates to form a pressure sensing structure, when the upper-layer waveguide deforms due to external pressure, the distance between the upper-layer waveguide and the lower-layer waveguide and the coupling efficiency are changed, the output optical power of each optical waveguide is changed, and the output optical power of each optical waveguide is changed. Therefore, the pressure on the chip can be detected. According to the invention, high-precision sensing can be realized, and compared with a traditional electric pressure detection method, the method has the advantages of resisting electromagnetic interference, supporting sensing and transmission integration and high-speed dynamic sensing, and being suitable for dangerous occasions such as a complex electromagnetic environment and the like; compared with a wavelength resolution type optical pressure sensor, the optical pressure sensor has the advantages of wide spectrum, simple preparation process and high cost performance.

In some embodiments, a near-eye, near-eye display system comprises a stack of waveguides having pillars in a central, active portion of the waveguides. The active portion may include light outcoupling optical elements configured to outcouple image light from the waveguides towards the eye of a viewer. The pillars extend between and separate neighboring ones of the waveguides. The light outcoupling optical elements may include diffractive optical elements that are formed simultaneously with the pillars, for example, by imprinting or casting. The pillars are disposed on one or more major surfaces of each of the waveguides. The pillars may define a distance between two adjacent waveguides of the stack of waveguides. The pillars may be bonded to adjacent waveguides may be using one or more of the systems, methods, or devices herein. The bonding provides a high level of thermal stability to the waveguide stack, to resist deformation as temperatures change.

The application provides a chip loss testing method and a chip loss testing device. The chip loss testing method comprises the following steps: coupling a first optical fiber in a test optical fiber array with an input waveguide of a chip to be tested; coupling a second optical fiber in the test optical fiber array with an output waveguide of the chip to be tested, wherein the number of the second optical fiber is not less than the number of the output waveguide of the chip to be tested; testing a test data set obtained by inputting a first laser into the first optical fiber, passing through the input waveguide of the chip to be tested and the output waveguide of the chip to be tested, and outputting by the second optical fiber, wherein the number of test data in the test data set is the same as the number of the output waveguide of the chip to be tested; and calculating loss data of each channel of the chip to be tested according to test data set and calibration data matched with the test optical fiber array, wherein the input waveguide of the chip to be tested and any one of the output waveguides of the chip to be tested form a channel.

The utility model discloses an optical waveguide assembly and a near-to-eye display device, the optical waveguide assembly comprises a first optical waveguide, a second optical waveguide, a third optical waveguide and a light blocking element, the first optical waveguide is provided with a coupling element, a first optical path turning element is arranged between the second optical waveguide and the first optical waveguide, and the third optical waveguide is provided with a coupling element. Light transmitted in the first optical waveguide passes through the first optical path turning element and then enters the second optical waveguide to be transmitted; a second optical path turning element is arranged between the third optical waveguide and the second optical waveguide, so that light transmitted in the second optical waveguide passes through the second optical path turning element and then enters the third optical waveguide for transmission, and a coupling-out element is arranged on the third optical waveguide and is used for coupling out the light in the third optical waveguide to enter human eyes; the light blocking element is arranged between the first optical waveguide and the third optical waveguide and used for preventing light of the coupling-out side of the third optical waveguide from being transmitted from the first optical waveguide. According to the optical waveguide assembly provided by the utility model, the concealment of an observer can be ensured.

The application discloses a mode spot converter integrated based on a gradient refractive index waveguide and a two-dimensional inverted taper waveguide, which comprises a silicon substrate, a gradient refractive index waveguide, a silicon dioxide substrate, a two-dimensional inverted taper waveguide and a cladding, the silicon dioxide substrate, the two-dimensional inverted taper waveguide and the cladding are sequentially arranged on one side of the silicon dioxide substrate, and the gradient refractive index waveguide is arranged on the other side of the silicon substrate and is attached to the two-dimensional inverted taper waveguide; the opposite faces of the gradient refractive index waveguide are respectively provided with a first input port and a first output port, the long axis of the two-dimensional inverted taper waveguide is provided with a second input port and a second output port at both ends, and the first output port is attached to the second input port; incident light is incident from the first input port, is output from the first output port after being condensed by the gradient refractive index waveguide, is then incident into the two-dimensional inverted taper waveguide through the second input port for adiabatic transmission, and is finally output from the second output port and coupled with an integrated silicon waveguide.

A communication method comprises the following steps: a microstrip line transmits a first radio frequency signal from an active device to an oscillator, and couples a second radio frequency signal and a third radio frequency signal transmitted by the oscillator to a waveguide; the second radio frequency signal is a part of radio frequency signal transmitted to the oscillator; the third radio-frequency signal is a radio-frequency signal reflected by a capacitor composed of the polar plate and the grounding plate; the communication method is used for the transmission band line waveguide connector. The transmission band line waveguide connector comprises a transmission band line, a dielectric substrate and a grounding plate. The transmission band line is located on the first surface of the dielectric substrate, and the grounding plate is located on the second surface of the dielectric substrate; the grounding plate is provided with a gap which is used for coupling with the waveguide. The transmission band line comprises a microstrip line, a pole plate and an array coupled with the gap; wherein one end of the microstrip line is connected with the polar plate, the other end is connected with an active device, and the oscillator is located between the two ends of the microstrip line and connected with the microstrip line; the pole plate is connected with the direct current feed end, and the pole plate is coupled with the grounding plate.

A sensor unit having a coupling-in waveguide and a coupling-in unit which couples a state present on the coupling-in waveguide to a first waveguide and a second waveguide. The sensor unit includes a first coupling-out unit that couples in a state present on the first waveguide to a coupling waveguide and couples out a state present on the coupling waveguide to a first coupling-out waveguide. The sensor unit includes a second coupling-out unit which couples in a state present on the second waveguide to the coupling waveguide and couples out a state present on the coupling waveguide to a second coupling-out which couples with the coupling waveguide, and a detection unit including at least one detector for detecting states present at or output from the at least first and / or second coupling-out waveguide or states dependent on these states.

The present disclosure is directed to the design and fabrication of a two-layer optical switching cell that controllably distributes and reroutes optical signals between bus optical waveguides of an optical switch network. The two-layer optical switching cell includes one or more mechanical optical switches fabricated on a waveguide layer containing bus optical waveguides. The optical switches include suspended commutation optical waveguides supported by a metal structure and configured to couple light from one bus optical waveguide to another bus optical waveguide upon electromechanical actuation. A method for fabricating such an optical switch includes steps that enable fabrication of an optical switching cell with silicon nitride or single crystal silicon optical waveguides and a metal clamp support structure.

This invention relates to a pattern-reconfigurable antenna based on artificial surface plasmon polaritons (SSPPs), belonging to the field of antenna technology. The antenna includes a coplanar waveguide feed line, a transition structure, a reconfigurable SSPP waveguide, and periodic radiating elements. The reconfigurable SSPP waveguide modifies the dispersion characteristics by adding a varactor diode to a traditional SSPP element and adjusting the capacitance value using a bias circuit. The periodic radiating elements are elliptical patches with rectangular slots, coupled to the reconfigurable SSPP waveguide to radiate electromagnetic waves. This invention solves the problems of single radiation direction in traditional antennas and low gain in existing reconfigurable antennas. It achieves fixed-frequency beam scanning (maximum 23°) and frequency beam scanning (maximum 90°) in the 11.5GHz-15GHz frequency band, with gains greater than 9dBi (maximum 11.1dBi), expanding the detection range and increasing the detection distance, making it suitable for fields such as UAV detection.

According to an aspect there is provided an optical monitoring device comprising:a first input for receiving a portion of a first optical signal coupled from a first waveguide into the first input;a second input for receiving at least a portion of a second optical signal coupled into the second input;a mixing unit for controlling combining of the portion of the first optical signal with the at least a portion of the second optical signal into a combined signal at an output from the mixing unit; andat least one photodetector for detecting the combined signal.The optical monitoring device is configured to apply a modulation signal to modulate at least one of a phase of the portion of the first and / or second optical signal, a coupling of the portion of the first and / or second optical signal into the respective input, or an amplitude of the portion of the first and / or second optical signal being transferred into the combined signal.

A phased-array optoelectronic emitter includes a laser chip containing a flared laser source and a photonic chip containing phase shifters and elementary transmitters placed in N arms. The photonic chip includes a coupler that ensures optical coupling between the flared laser source and the arms, the coupler having a collection input placed facing the emission surface of the flared laser source and a transmission output comprising N rectilinear waveguides that are coupled to the N arms of the optoelectronic emitter and that are oriented so that their longitudinal axes are secant at a position located in a flared section of the laser source on an optical axis of the laser source.

The invention discloses an integrated millimeter wave noise source of an MSM photoelectric detector based on waveguide coupling, and relates to the technical field of noise sources. Incoherent light generated by the incoherent light source module is transmitted and diffracted to the MSM photoelectric detector module through the optical waveguide chip module, then optical down-conversion is carried out on the incoherent light, and millimeter wave noise is generated and output. In addition, heterogeneous integration of the incoherent light source module, the optical waveguide chip module and the MSM photoelectric detector module is realized on the noise source substrate. Compared with a photon noise source formed by discrete devices, the photon noise source has the advantages of being small in size and high in robustness.

The invention belongs to the technical field of tunable lasers, and particularly relates to a grating scribed line density testing method and system based on a tunable laser, and the system comprises the tunable laser, a mechanical arm, a testing module and a control module. The characteristic that the tunable output range of a tunable laser (carrier) is sensitive to the grating scribed line density is fully utilized, and the mapping relation between waveguide coupling output multi-wavelength and the grating diffraction angle (or the displacement stride of an actuator) is deeply analyzed; according to the method, automatic analysis of the to-be-measured grating scribed line density under different batches, different substrate materials and different manufacturing process conditions is realized, and on the basis, accurate and rapid screening of qualified gratings suitable for tunable laser assembly is realized.

The application provides a visual micro-nano optical waveguide refractive index sensing system, and a hardware part comprises a nano fiber taper coupled fluorescent doped polymer microwire; the nano fiber taper coupled fluorescent doped polymer microwire is coupled by a nano fiber taper and a fluorescent doped polymer microwaveguide; the nano fiber taper is obtained by adopting a flame tapering method from a standard single-mode optical fiber; the fluorescent doped polymer microwaveguide is directly prepared by wire drawing from a mixed solution doped with a fluorescent dye; the nano fiber taper and the fluorescent doped polymer microwaveguide placed in a channel of an optical substrate jointly form an evanescent wave coupling structure; a signal analysis part enhances, edge extracts, smoothes and peak extracts a fluorescent image of the microwire through an image analysis algorithm, obtains an oscillation period of a fluorescent light path in the microwire under a current environment, establishes a response relationship between the light path period and the environmental refractive index, realizes direct real-time obtaining of environmental change conditions from optical images of a sensing unit shot by a camera, and thus obtains the change of the refractive index.

A system for photocatalytic conversion includes a flowline, in which a production flow travels in a flow direction; and a reactor module. The reactor module includes a waveguide; a photocatalyst coupled to the waveguide, configured to convert hydrogen sulfide in the production flow to hydrogen and sulfur; a heater configured to heat a bottom of the reactor module, such that the sulfur is in liquid phase; and a sulfur collector configured to collect the sulfur. A method for photocatalytic conversion includes introducing a production flow from a flowline to a reactor module, the production flow including hydrogen sulfide and traveling in a flow direction; directing a light from a light source to a photocatalyst through a waveguide; converting the hydrogen sulfide into hydrogen and sulfur using the photocatalyst; and heating a portion of the reactor module to an elevated temperature, the sulfur in a liquid phase under the elevated temperature.

The invention provides a micro-ring modulator and a silicon optical chip, the micro-ring modulator comprises an annular waveguide and a strip-shaped waveguide, and the annular waveguide is arranged at one side of the strip-shaped waveguide; the strip-shaped waveguide receives input light, the annular waveguide is coupled with the strip-shaped waveguide, the annular waveguide receives coupling input light of the strip-shaped waveguide, and the coupling input light is transmitted along a path of the annular waveguide; the annular waveguide is provided with a first part close to the strip-shaped waveguide and a second part far away from the strip-shaped waveguide, the first part has a first width, the second part has a second width, the first width is smaller than the second width, and the width of the annular waveguide is gradually increased from the first part to the second part. The silicon optical chip is applied to the micro-ring modulator, process errors can be resisted, and the performance stability of the micro-ring modulator is ensured.