9572results about "Optical waveguide light guide" patented technology

The invention relates to the technical field of light emitting devices, and discloses a control method for a silicon light integrated multi-wavelength light emitting device, and the method comprises the steps: carrying out the grating coupling processing and polarization state separation processing of a plurality of wavelength channels of the silicon light integrated multi-wavelength light emitting device, and obtaining an initial optical characteristic data set; performing temperature response characteristic analysis to obtain a temperature field characteristic parameter set; performing spectral characteristic analysis on the plurality of wavelength channels to obtain wavelength channel characteristic vectors; a wavelength drift coefficient matrix and a refractive index change coefficient matrix are calculated, and a multi-wavelength linkage control data model is generated; according to the method, a hierarchical control structure comprising a quick response layer, a temperature compensation layer and a polarization optimization layer is constructed, multi-wavelength cooperative control operation is executed, and a steady-state control parameter set is output, so that the wavelength stability control precision and the temperature control precision are improved, the adaptive capacity to disturbance of different time scales is enhanced, and the stability of the system is improved. And stable operation under complex working conditions is ensured.

The invention relates to a single-mode ultra-low-loss hollow-core anti-resonance optical fiber which comprises an outer cladding and an inner cladding, the inner cladding is composed of nested structure units, the nested structure units are arranged at intervals in the circumferential direction of the inner wall of the outer cladding and connected with the inner wall of the outer cladding, a fiber core is formed by a central cavity wrapped by the inner cladding, and the fiber core is connected with the inner wall of the inner cladding. Each nested structure unit comprises two or more layers of nested glass tubes with different radiuses, and is characterized in that an auxiliary inner cladding layer is arranged along the circumferential direction of the inner wall of the outer cladding layer and comprises an auxiliary nested structure unit; the auxiliary nested structure units and the nested structure units are arranged at intervals in a staggered mode in the circumferential direction of the inner wall of the outer cladding layer, the auxiliary nested structure units are connected with the inner wall of the outer cladding layer, and a circular mold releasing cavity tangent to the auxiliary nested structure units and the nested structure units on the two adjacent sides is formed between the auxiliary nested structure units and the nested structure units on the two adjacent sides. Through the change of the cladding structure, the high-order mode loss is improved while the fundamental mode loss is reduced, so that the low-loss transmission under a high-purity single mode is realized.

Various embodiments provide for clock signal distribution within a processor, such as a machine learning (ML) processor, using a photonic fabric.

Various embodiments provide for electro-photonic networks, including a plurality of processing elements connected by bidirectional photonic channels, suited for implementing neural-network models. Weights of the model may be preloaded into memory of the processing elements based on assignments of neural nodes to processing elements implementing them, and routers of the processing elements can be configured to stream activations between the processing elements based on a predetermined flow of activations in the model.

A hollow-core optical fiber with a crescent-shaped fiber core. The optical fiber comprises a crescent-shaped air fiber core (1) and a cladding microstructure region (2), wherein the cladding structure of the optical fiber uses a multi-tubular structure; the crescent-shaped fiber core is located between the outer side of an inner tube and the inner side of an outer tube of the cladding microstructure region (2), thereby forming a crescent-shaped structure; and an inner layer (21) of the cladding microstructure region (2) consists of a plurality of air layers (23) and tubular structures, and an outer layer (22) of the cladding microstructure region (2) also consists of a plurality of air layers (23) and tubular structures. By means of adjusting the size of the air layers and the wall thickness of the tubular structures, anti-resonant light guiding can be realized. The hollow-core optical fiber with a crescent-shaped fiber core has advantages such as an ultra-low transmission loss, a wide light-guide passband, polarization maintenance and an adjustable mode, and is suitable for applications in the fields of optical communications, fiber-optic gyroscopes, etc.

A medical device operating as a stylet is described. The medical device can include an insulating layer (or sheath) encapsulating both a multi-core optical fiber and a conductive medium. The optical fiber can include a cladding and a plurality of core fibers spatially arranged within the cladding. Each of the core fibers can include a plurality of sensors distributed along a longitudinal length of that corresponding core fiber and each of these sensors can be configured to: (i) reflect a light signal of a different spectral width based on received incident light, and (ii) change a characteristic of the reflected light signal for use in determining a physical state of the multi-core optical fiber. The conductive medium can provide a pathway for electrical signals detected at a distal portion of the conductive medium. The conductive medium may be concentric to the cladding, but separate and adjust thereto.

The invention discloses a structure parameter library construction method, a super-lens design method and an optical system. The super-structure grating primitive structure parameter library construction method comprises the steps of obtaining a first grating primitive structure and determining a first periodic distribution function according to the first grating primitive structure; according to the characteristics of the grating primitive structure, full-analytic Fourier transform expansion is carried out on the first periodic distribution function, and a first Fourier analytic function corresponding to the first grating primitive structure is obtained; performing strict coupling wave analysis on the first Fourier analytic function in a preset polarization direction to obtain first complex amplitude information; and according to the first complex amplitude information, determining first matrix information used for describing a polarization behavior of a first grating primitive structure, and associating the first matrix information and the first grating primitive structure as first design information in a parameter library. The structural parameter library construction method provided by the invention is suitable for an application scene for processing polarization characteristics and phase information, and avoids segmentation or discretization.

The invention relates to a compact polarization rotation beam splitter, which comprises an input waveguide, a mode conversion region, a mode coupling region and an output waveguide, a TM0 mode optical signal in the optical signals is converted into a TE mode high-order optical signal in the mode conversion area; the mode coupling region is used for coupling the TE mode high-order optical signal into a TE0 mode optical signal with the first adiabatic coupling waveguide; and the output waveguide is used for outputting a TE0 mode optical signal which is not subjected to mode conversion in the optical signals, and outputting a TE0 mode optical signal obtained after mode conversion of the mode conversion area and the second adiabatic coupling waveguide. According to the invention, the polarization rotation path can be shortened through high-order mode conversion in the mode conversion area, efficient beam splitting is realized by using the asymmetric adiabatic coupling waveguide in the mode coupling area, the size reduction of a redundant structure is avoided through function integration, the performance of the beam splitter is ensured, and the problems of large size and low cost of the existing polarization rotation beam splitter are solved. And the performance is not good.

The invention provides a nanoimprint master mask, an optical waveguide and a manufacturing method of the nanoimprint master mask and the optical waveguide. The nanoimprint master mask and the optical waveguide can solve the problems that in the nanoimprint process, the edge of a grating structure area is poor, and residual glue is not uniform. The nanoimprint master mask comprises: a grating structure region; the non-grating structure region is positioned on the periphery of the grating structure region; and the sinking structure is arranged at a position, which is adjacent to the grating structure area, on the non-grating structure area, and the sinking structure extends along the peripheral direction of the grating structure area so as to surround the grating structure area.

The invention relates to the technical field of high polymer materials and preparation thereof, and discloses a wet anti-slip bionic friction pad on a glass surface, which is inspired by a micro-nano structure of toe pads of organisms such as tree frogs and long-horned grasshoppers with wet friction increasing characteristics, and a bulge array is added on the surface of a high-friction material, so that the friction coefficient of the friction pad is increased; the microstructure arrays can discharge a water film on the surface of the friction pad under the capillary action in a wet environment, and the effective contact area between solids is increased, so that the friction pad and a friction surface are always kept in a dry friction state, and stable friction force is ensured. The friction pad comprises a connecting layer, a supporting layer and a tail end protruding straight column array, a tail end contact layer is in a hexagonal straight column shape, the diameter of an inscribed circle of a hexagonal micro-column structure ranges from 5 micrometers to 5000 micrometers, column bodies are densely arranged in a hexagonal mode, the height of the column bodies ranges from 10 micrometers to 1500 micrometers, the tail ends of the column bodies are planes, the interval between every two column bodies ranges from 2 micrometers to 600 micrometers, and tight drainage grooves are formed.

The invention provides a flexible palladium film hydrogen sensor and a preparation method thereof, the flexible palladium film hydrogen sensor is sequentially provided with a flexible substrate, a hydrogen sensitive sensing layer and a contact connection layer from bottom to top, and the contact connection layer is connected with a resistance measurement unit; and the hydrogen-sensitive sensing layer is a palladium or palladium alloy film with a conical micro-nano structure. The palladium or palladium alloy thin film with the conical micro-nano structure provides a hydrogen sensor conical surface micro-nano structure with a high specific surface area for the flexible palladium thin film hydrogen sensor, and the process that hydrogen is adsorbed, dissolved and diffused into the palladium or palladium alloy thin film is accelerated, so that the response speed of the sensor is increased; according to the hydrogen sensor, the flexible substrate is adopted, so that the hydrogen sensor can be conveniently arranged in various narrow spaces, and the applicability of the hydrogen sensor in various scenes is improved.

The invention discloses an optical fiber Fabry-Perot sensor for detecting C4F7N gas and decomposition products thereof, belongs to the technical field of C4F7N gas detection, and solves the problem of how to improve the sensitivity of the optical fiber Fabry-Perot sensor for detecting the C4F7N gas and the decomposition products thereof. According to the optical fiber Fabry-Perot sensor for detecting the C4F7N gas and the decomposition products thereof, the Fabry-Perot cavity is formed by the interval between the end face of the single-mode optical fiber and the surface of the groove, emergent light of the single-mode optical fiber is reflected by the surface of the groove, the reflected light is converged by the groove, the loss of the reflected light is reduced, and the detection accuracy of the C4F7N gas and the decomposition products thereof is improved. Gold is uniformly sputtered on one surface of the groove of the sensing diaphragm device layer to form a layer of reflecting film, so that the reflectivity is further improved, reflected light is efficiently coupled into the single-mode optical fiber, the contrast ratio of a light interference peak is improved, and the detection sensitivity of the sensor is further improved; the sensor is simple in structure, small in size, high in reliability and capable of achieving high-sensitivity measurement of the C4F7N gas decomposition products.

A photonic chip. In some embodiments, the photonic chip includes a waveguide; and an optically active device comprising a portion of the waveguide. The waveguide may have a first end at a first edge of the photonic chip; and a second end, and the waveguide may have, everywhere between the first end and the second end, a rate of change of curvature having a magnitude not exceeding 2,000 / mm2.

A method of fabricating a layered waveguide display comprises imprinting a surface-relief grating (SRG) on a first substrate, filling grating grooves of the SRG with a backfill material, depositing a first layer of an index-matching material on the SRG, and bonding the first layer of the index-matching material on the SRG to a first side of a second substrate. The first substrate and the SRG are characterized by a first refractive index and a second refractive index, respectively. The backfill material is characterized by a third refractive index greater than the first refractive index and the second refractive index. The index-matching material is characterized by a fourth refractive index greater than the first refractive index and the second refractive index. In some embodiments, the backfill material is the same as the index-matching material. The second substrate is characterized by a fifth refractive index matching the fourth refractive index.

Disclosed herein is autonomous vehicle charging station featuring self-cleaning contact points, power flow safety features, and electrical connection testing (meeting minimum performance thresholds) for safe and efficient power transfer from the charging station to the autonomous vehicle. After docking, power line modem (PLM) communications are established between the autonomous vehicle and the charging station via an electrical power connection resulting from the docking act as an initial test of connectivity, and then the electrical power connection is determined to be safe with non-lethal power flow before charging the autonomous vehicle.

The invention discloses an interposer, a photoelectric co-packaging structure and a preparation method thereof, and the interposer comprises a substrate which comprises a glass substrate or a quartz substrate; the first waveguide layer is arranged on the substrate, and at least one first waveguide structure is arranged in the first waveguide layer; the first waveguide structure comprises a first optical waveguide; the second waveguide layer is arranged on the side, away from the substrate, of the first waveguide layer, and at least one second waveguide structure is arranged in the second waveguide layer; the second waveguide structure comprises N second optical waveguides, third optical waveguides,... and (N + 1) th optical waveguides which are sequentially stacked on one side, far away from the substrate, of the first waveguide layer; wherein 1 < = N; the refractive indexes of the second optical waveguide, the third optical waveguide,..., and the N + 1th optical waveguide are sequentially increased, and the refractive index of the second optical waveguide is greater than the refractive index of the first optical waveguide. The technical scheme of the invention aims to provide the photoelectric co-packaging structure capable of realizing high-density integration.

The invention discloses a waveguide array gas sensing system for high-sensitivity multi-gas detection. The waveguide array gas sensing system comprises a waveguide substrate, and a waveguide Bragg grating, a phase shift Bragg grating, a micro-ring resonator, a Mach-Zehnder interferometer, a waveguide array, an electric field regulation and control module and a signal processing unit which are arranged on the waveguide substrate. Through the waveguide array structure, topological optical protection adsorption and other technologies, the sensitivity and selectivity of methane, carbon dioxide and other gases are effectively improved, and accurate detection can be achieved in a complex environment; according to the invention, a topological optical principle is adopted, signal loss caused by environmental noise or surface defects is reduced, and the stability of the sensor is improved; according to the invention, automatic calibration and temperature and humidity compensation of the system are realized, and autonomy and operation convenience of the system are enhanced; the system has high environment adaptability and can stably work under different temperature and humidity conditions.

The invention relates to an optical fiber hydrogen sensor based on a silver film-nanowire hole array structure and a preparation method thereof in the field of photochemical sensors. The optical fiber hydrogen sensor comprises a multimode optical fiber, and a sensing area is formed on the multimode optical fiber; the sensing area is formed by stripping a coating layer with a preset length from the multimode optical fiber, thinning the optical fiber in the area, plating a silver film on the surface of the thinned optical fiber, and adsorbing a nanowire hole array structure which is sequentially and vertically arranged on the surface of the silver film in a liquid level self-assembly manner; the nanowire hole array is of a metal-medium-metal (MIM) structure, a gold-palladium nanowire array is arranged at the bottom, an intermediate medium layer is made of aluminum oxide, and a silver film with a hole array in any shape is arranged at the top. When light is transmitted to a sensing area from a fiber core of the multimode optical fiber, the light and a metal silver film can excite a surface plasmon resonance (SPR) effect, meanwhile, an MIM structure formed by a gold-palladium nanowire, an aluminum oxide dielectric layer and a porous silver film serves as an optical coupling antenna through a local surface plasmon resonance (LSPR) effect at the edge of a top hole, and the optical coupling antenna is used for transmitting the light to the sensing area. Light energy is efficiently converged and excited in an extremely bound gap plasmon (Gap Plasmon) in an aluminum oxide dielectric layer, so that far-unconventional electromagnetic field enhancement is generated in a sensing core area, and the sensitivity of the sensor is greatly improved.

The invention discloses a trigeminal structure spot size converter for a proton exchange waveguide and a preparation method. The trigeminal structure spot size converter sequentially comprises a substrate, an insulating layer and a lithium niobate film layer, the lithium niobate film layer comprises a first waveguide part which is used as an input end of the converter; the second waveguide part is connected with one end of the first waveguide part and is positioned on the same plane as the first waveguide part; a third waveguide portion on the second waveguide portion; the proton exchange waveguide is arranged in the third waveguide part, light is transmitted in the first waveguide part, the second waveguide part, the third waveguide part and the proton exchange waveguide in sequence, and the transverse sizes of the second waveguide part, the third waveguide part and the proton exchange waveguide are sequentially increased in the light transmission direction. The silicon oxynitride waveguide guides light waves in the optical fiber to enter the chip, the light waves in the optical fiber are efficiently guided, the light waves are limited in the silicon oxynitride waveguide and enter the lithium niobate waveguide, and loss caused by light wave diffusion is avoided; a conical waveguide structure is adopted, mode mutation is avoided, and coupling loss is reduced.

Microelectronic assemblies including photonic integrated circuits (PICs), related devices and methods, are disclosed herein. For example, in some embodiments, a photonic assembly may include a PIC in a first layer including an insulating material, wherein the PIC is embedded in the insulating material with an active surface facing up; a conductive pillar in the first layer; an integrated circuit (IC) in a second layer on the first layer, wherein the second layer includes the insulating material and the IC is embedded in the insulating material, and wherein the IC is electrically coupled to the active surface of the PIC and the conductive pillar; an optical component optically coupled to the active surface of the PIC; and a hollow channel surrounding the optical component, the hollow channel extending from the active surface of the PIC through the insulating material in the second layer.

The invention provides an on-chip all-optical switching network device, a semiconductor device and a manufacturing method thereof. The on-chip all-optical switching network device comprises: a photonic chip formed with at least two photonic integrated circuit sub-chips optically interconnected with each other; the at least two optical switching control analog electric chips are respectively arranged on the at least two photon integrated circuit sub-chips; each photon integrated circuit sub-chip is internally provided with at least one on-chip optical switch, at least two communication nodes suitable for communicating with an external device, and a plurality of first type optical waveguides used for connecting the on-chip optical switch and the communication nodes; on the photon chip, communication between any two communication nodes is realized through at least one on-chip optical switch. According to the invention, through the plurality of on-chip optical switches, a series of digital electric chips can carry out parallel processing on information at the same time, and the requirements of an artificial intelligence algorithm on computing power and bandwidth can be better met.

Embodiments described herein also relate to electronic and photonic integrated circuits, and methods for fabricating integrated interconnects between electrical, optoelectronic and photonic elements. One or more optical silicon photonic elements described herein may be used on a single package substrate in conjunction with one or more optoelectronic integrated circuits (optoelectronic chips) to form co-packaged optical and electrical elements. The methods described herein enable mass fabrication of electrical, optoelectronic, and optical silicon photonic elements having a plurality of optical structures, such as waveguides, formed on or integrated with a photonic glass layer substrate.

The invention discloses an all-optical photo-thermal polarization modulation system based on a micro-nano optical fiber asymmetric mode field, and solves the problems of slow response, large size, high power consumption and the like of traditional polarization modulation. The system comprises a micro-nano optical fiber with an asymmetric section, a micro-nano optical fiber with a deposited photo-thermal regulation and control layer, a control light source with the wavelength of 800-1100 nanometers, a signal light source with the wavelength of 1300-1600 nanometers and a detection module. The light is controlled to excite the photo-thermal effect, local temperature change is generated, birefringence of the micro-nano optical fiber is changed through the photo-thermal effect, dynamic modulation of the polarization angle of the signal light is achieved, and the response time is smaller than 50 microseconds. The method comprises the steps of preparing the micro-nano optical fiber, injecting control light to adjust birefringence, inputting signal light to realize polarization modulation, and detecting and optimizing output. The technology utilizes the synergistic effect of the asymmetric mode field and the photothermal effect, has the advantages of high efficiency, rapidness, low power consumption and high integration, is suitable for the fields of optical communication, optical sensing and quantum optics, and remarkably improves the polarization regulation and control performance.

A photonic integrated circuit (PIC) disposed on a substrate and comprising a semiconductor die hosting an active portion and a passive portion mutually coupled, the active portion being configured to consume electrical power when activated, and the passive portion comprising an optical transmission medium configured to propagate an optical signal to or from the active portion of the PIC; an electronic integrated circuit (EIC) electrically coupled to the active portion of the PIC and comprising components that electrically operate on the active portion of the PIC; and a packaging compound at least partially encapsulating the PIC, the packaging compound defining a cavity on a side of the semiconductor die that is opposite from the substrate, the cavity being filled with an optically transparent medium such that the optical signal can be received from or transmitted to the passive portion of the PIC through the cavity.

The invention belongs to the technical field of integrated optics and inertial sensing, and particularly relates to a thin-film lithium niobate heterogeneous integrated chip configuration for a fiber-optic gyroscope. The thin-film lithium niobate hybrid photon integrated chip is utilized to realize on-chip heterogeneous integration of functional devices of the fiber-optic gyroscope. The discrete optical path device of the gyroscope is monolithic integrated and integrally packaged, the size and cost of the optical path are greatly reduced, optical fiber interconnection is reduced, the complexity of the assembly process is obviously reduced, and the long-term reliability of the performance of the gyroscope is effectively improved. By means of the CMOS technology with mature silicon photons, low-cost and large-scale batch production of the miniature fiber-optic gyroscope can be achieved, and the requirements for miniaturization and light weight of a future weapon system are met.

The invention provides a chirped fiber bragg grating manufacturing method based on asymmetric apodization, which is applied to the technical field of fiber bragg grating preparation, and the method comprises the steps: determining a target asymmetric envelope function corresponding to a target chirped fiber bragg grating based on the parameter requirements of the target chirped fiber bragg grating; adjusting the pulse number of laser output by the femtosecond laser based on the target asymmetric envelope function; laser is controlled to irradiate a target area in the optical fiber, a target chirped fiber grating is formed, and the pulse number of the laser changes according to a target asymmetric envelope function and is gradually reduced from the center of the grating to the two ends. According to the method, the femtosecond laser pulse number is adjusted based on the asymmetric envelope function, so that the distribution gradient of refractive index modulation is finely adjusted, better reflection spectrum and time delay characteristics are obtained, the high-precision requirements for laser energy adjustment and displacement platform movement are reduced, and the apodization machining precision of the chirped fiber grating is effectively improved.

The invention discloses a spot-size converter (SSC) and a high-power external cavity laser chip, the external cavity laser chip comprises a wide-ridge gain chip and a passive external cavity chip, one end of the wide-ridge gain chip is plated with a high-reflection film as a reflection end, and the other end of the wide-ridge gain chip is plated with an antireflection film to realize low reflection; and efficient coupling of the fundamental mode of the wide-ridge gain chip with the size far larger than that of the single-transverse-mode waveguide and the small-size single-mode waveguide is realized by integrating the SSC. The SSC converts a large-size mode field and a small-size mode field mutually and effectively reduces optical coupling loss, mode selection and output wavelength adjustability are achieved by adjusting the longitudinal mode phase shifter and the micro-ring filter, part of power is fed back to the wide-ridge gain chip to construct external cavity resonance, and high-power output is achieved. According to the SSC, the device size can be remarkably reduced, a wide-ridge gain chip and an inter-chip hybrid integration process are compatible, and the tuning flexibility, the integration level and the overall stability of the laser are further improved while high-power output is kept.

The invention relates to an optical probe, in particular to a plasma optical sensing probe for online trace detection of biological threat factors. The sensing probe is composed of a microstructure optical fiber and a nano gold wire; the optical fiber is provided with two micro grooves which are symmetrically distributed, and the gold nanowires are located at the bottoms of the grooves; four inner-layer large air holes and two outer-layer small air holes are formed in the cladding of the optical fiber, and every two of the four inner-layer large air holes form a group and are symmetrically distributed relative to the groove; and the two outer-layer small air holes are symmetrically distributed relative to the micro groove. The radius of the optical fiber is 16 microns; the depth of the micro groove is 8 microns; the radius of the nano gold wire is 500 nm; the radius of each inner-layer large air hole is 4 microns, and among the four inner-layer large air holes, the horizontal circle center distance of the inner-layer large air holes is 13 microns, and the vertical circle center distance of the inner-layer large air holes is 11 microns; and the radius of the small air holes in the outer layer is 1.5 microns. According to the probe, efficient and accurate biomolecule detection is realized, and reliable technical support is provided for early diagnosis and timely treatment.