134 results about "Waveguide coupling" patented technology

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.

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.

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.

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.

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.

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.

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.

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.

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.

A photonic device 100 comprises a first interface 2 coupling a plurality of first device waveguides 4 to a plurality of light source 14 waveguides 16 and a second interface 6 linking a plurality of s

The invention discloses a 3D waveguide type multi-core optical fiber link monitor which comprises an optical chip platform with n layers of stacked waveguide structures and a photoelectric detector, n is larger than or equal to 2, and the number n of waveguide layers of the optical chip platform is equal to the number of layers of connected multi-core optical fibers. The cross section distribution of waveguides in the optical chip platform and the cross section distribution of fiber cores of the multi-core optical fiber are the same and are in one-to-one correspondence; a waveguide channel corresponding to each fiber core of the multi-core optical fiber in the optical chip platform comprises an optical fiber signal coupling fan-out module, an optical signal beam splitting module, an optical signal monitoring module and a multi-core optical fiber signal coupling fan-in module which are connected in sequence; after an optical signal of a multi-core optical fiber transmitting end is coupled by the fan-out module, a small part of the signal is separated by the beam splitting module through a waveguide coupling effect and is used for monitoring, and most of the signal is transmitted back to a transmission link through the fan-in module; and the monitoring module realizes real-time detection through a photoelectric detector. According to the invention, no extra optical fiber fan-in / fan-out module is needed, the insertion loss is low, and the device is not sensitive to polarization.

An apodization grating coupler based on a thin film lithium niobate platform comprises a silicon substrate, a buried silicon oxide layer, a thin film lithium niobate layer and a silicon oxide cladding which are sequentially arranged from bottom to top, and an end face coupler, a thin film lithium niobate waveguide, a light beam expander and an apodization grating are sequentially arranged in the thin film lithium niobate layer. The end face coupler couples light of the conical optical fiber into the thin film lithium niobate waveguide, and after the light is input into the apodization grating through the light beam expander, large-beam-waist Gaussian light beams are coupled through diffraction of the apodization grating. On the basis of the large-size apodization grating, through a compact plane photon structure, the 700 nm * 300 nm lithium niobate high-refractive-index single-mode waveguide can be coupled to a near-surface normal Gaussian beam with a beam waist of about 110 m and good collimation, the diffraction angle is 10 degrees, centimeter-level propagation is achieved in a free space, and the loss is 5.6 dB.

A method for determining a parameter of an optical device including a first waveguide and a resonator is provided. The method includes coupling an optical signal from a first waveguide to a resonator. The resonator includes a first P / N junction configured to modulate a resonant frequency of the resonator until the optical signal resonates in the resonator and a ring waveguide. The method further includes detecting a resonance spectrum of the optical signal from the through port of the first waveguide and determining a parameter of the optical device based on the resonance spectrum of the optical signal.

The embodiment of the invention provides an optical splitter, an optical fiber distribution network and a passive optical network, which are used for determining a network topology. The optical splitter provided by the embodiment of the invention comprises a beam splitting unit, a plurality of first waveguides and a plurality of delay units, wherein the beam splitting unit comprises a common port and a plurality of branch ports. The plurality of first waveguides are connected with the plurality of branch ports one by one, and the plurality of delay units are connected with the plurality of first waveguides one by one. Any one of the plurality of delay units comprises a beam splitting and combining module and a delay module. The beam splitting and combining modules are coupled with the corresponding first waveguides, the beam splitting and combining modules are used for separating second optical signals from the first optical signals in the first areas of the first waveguides and coupling the second optical signals passing through the time delay modules to the second areas of the first waveguides, and the time delay modules are used for providing optical path differences between the first optical signals and the second optical signals. In the plurality of delay units, the delay modules of different delay units are used for providing different optical path differences.

A one-by-four optical splitting device is disclosed. The optical splitting device can include a main waveguide, a first coupling waveguide, and a second coupling waveguide. The main waveguide can couple light from the main waveguide into both the first coupling waveguide and the second coupling waveguide. Due to manipulation of the coupling modes, one fundamental mode of light can be input and four fundamental modes of light can be output. In some examples, the main waveguide can input a fundamental mode of light, which can be converted to a first hybrid mode, which can be a four-lobe mode. The first coupling waveguide and the second coupling waveguide can be tapered and separated by a gap, such that the first hybrid mode can be converted to two second hybrid modes, which can then be converted back to the four fundamental modes of output light.

The invention relates to the technical field of terahertz wave generation and transmission, in particular to a rectangular waveguide output type photoconductive mixer based on effective dielectric silicon waveguide coupling. The photoconductive mixer comprises a photoconductive substrate used for exciting carriers through a photoconductive effect; the metal planar antenna is arranged on the first surface of the photoconductive substrate and is used for converting carrier current into a terahertz radiation signal; the effective medium silicon waveguides are arranged on the second surface and the two side faces of the photoconductive substrate in a coupling mode, and the second surface is opposite to the first surface; the rectangular waveguide is used for receiving and outputting a terahertz signal; the effective medium silicon waveguide comprises a waveguide core and air hole arrays distributed on the two sides of the waveguide core, and the air hole arrays are configured to enable the effective medium silicon waveguide to form a refractive index gradient so as to constrain transmission of signals in the waveguide core. By adopting the method, rectangular waveguide output can be efficiently realized, and the method has the characteristic of high structural integration degree.

This invention relates to an apparatus and method for fabricating optical fiber preforms using a near-atmospheric pressure microwave plasma in-tube method. The apparatus includes two waveguide coupling units and a plasma resonant cavity. The plasma resonant cavity includes a cavity shell and a cylindrical body. The cavity shell forms a cylindrical resonant cavity with two waveguide inlets on its sidewalls, which are respectively connected to the waveguides of the two waveguide coupling units. The cylindrical body is a cylindrical structure with open ends, disposed within the cylindrical resonant cavity and spaced apart from the sidewalls of the cavity. Multiple strip-shaped holes are formed on the sidewalls of the cylindrical body, spaced apart circumferentially. Each strip-shaped hole penetrates the sidewall of the cylindrical body radially and extends axially. This invention enables the one-step vitrification fabrication of doped optical fiber preforms on the inner wall of a large-size liner tube under near-atmospheric pressure conditions without a vacuum system or holding furnace.

The utility model relates to a slow light device based on coupling of a graphene nano-strip waveguide and four rectangular cavities. The slow light device comprises a silicon substrate, a sapphire layer, the graphene nano-strip waveguide, a first graphene rectangular resonant cavity, a second graphene rectangular resonant cavity, a third graphene rectangular resonant cavity and a fourth graphene rectangular resonant cavity. The sapphire layer is arranged above the silicon substrate; the upper surface of the sapphire layer is provided with a graphene nanometer strip waveguide, a first graphene rectangular resonant cavity, a second graphene rectangular resonant cavity, a third graphene rectangular resonant cavity and a fourth graphene rectangular resonant cavity. According to the utility model, an infrared graphene structure slow light device with large group refractive index and wide bandwidth is realized, an ultra-compact graphene slow light device is realized, and the size of the graphene structure slow light device is greatly reduced.

This invention provides an integrated ridge waveguide coupler combining tight and weak coupling, relating to the field of wireless communication technology. The ridge waveguide introduces a metal ridge within a rectangular waveguide, resulting in distinct electromagnetic fields between the ridge and its wide walls, with a strong electromagnetic field between the ridge and the wide walls, and a weak electromagnetic field on either side of the ridge. Utilizing this characteristic of varying electromagnetic field strength in different regions of the ridge waveguide, coupling holes are created in different areas of the wide walls to construct an integrated device with both tight and weak coupling functions, where strong mutual interference between the tight and weak couplings does not occur. This application innovatively integrates the traditionally separately designed, manufactured, and cascaded tight and weak couplers into a single stacked ridge waveguide structure. By creating coupling holes on different common wide walls to achieve coupling with different characteristics, connection losses are significantly reduced.