24results about How to "Reduce coupling loss" patented technology

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.

The invention discloses an end face coupler and a manufacturing method thereof, the end face coupler comprises a first waveguide, a second waveguide, a third waveguide, a fourth waveguide, a fifth waveguide and a sixth waveguide, when an external optical fiber outputs an optical signal to the first waveguide, the fourth waveguide expands the first waveguide, and the fifth waveguide expands the sixth waveguide; the fifth waveguide and the sixth waveguide evolve optical signals transmitted in the end face coupler in the vertical direction, so that mode fields of the optical signals are gradually distributed in the first waveguide in a concentrated mode and then transmitted to the second waveguide in the transmission direction of the optical signals, the loss of the optical signals transmitted to the second waveguide is reduced, and the transmission efficiency of the optical signals is improved. The fourth waveguide, the fifth waveguide and the sixth waveguide are formed by forming grooves in the lower cladding by adopting an etching process, depositing doped silicon dioxide in the grooves and on the lower cladding and performing chemical mechanical polishing treatment, and the first waveguide, the second waveguide and the third waveguide are formed by etching after deposition; the coupler has the advantages of low coupling loss and simple manufacturing process.

This invention provides an optoelectronic co-packaging structure and its packaging method. Utilizing the excellent optical transparency, thermal stability, and electrical insulation of a glass substrate, it combines through-hole electrical interconnects for electrical signal transmission and through-hole optical interconnects for optical signal transmission. Furthermore, it integrates optical components through dual-surface grooves, solving the problems of low optical interconnect efficiency, poor heat dissipation, and limited integration in traditional optoelectronic co-packaging. This significantly improves the optical interconnect efficiency, heat dissipation performance, and integration of the optoelectronic co-packaging structure. The invention also uses grooves to limit the electrical components, achieving precise alignment and transmission of optical signals and reducing optical coupling loss. Simultaneously, the overlapping of the orthographic projections of the two grooves causes partial vertical overlap of the two optical components, optimizing the optical path and thus greatly enhancing signal fidelity.

The invention discloses a silicon-based terahertz quintuple frequency multiplier based on a semi-closed coupling structure, comprising an input balun, a fourth harmonic frequency multiplication unit, an interstage transformer, a single-balanced mixer unit and an output balun. A single-ended fundamental wave signal is converted into a differential signal by the input balun and injected into the frequency multiplication unit. At the same time, a differential signal is split from the differential port of the input balun as the local oscillator of the mixer unit. The frequency multiplication unit generates a fourth harmonic and injects it into the source end of the mixer unit in a single-ended mode as an intermediate frequency signal. The mixer unit mixes the fundamental wave and the fourth harmonic to generate a five-fold frequency differential signal, and the output balun converts the differential signal into a single-ended output. Both the input balun and the output balun adopt a semi-closed coupling structure to reduce the coupling loss of passive devices. The structure has the characteristics of strong coupling and high design freedom, solves the problem of large loss of the passive coupling structure of the silicon-based millimeter-wave terahertz circuit, and improves the output power of the terahertz frequency multiplier.

The invention discloses a laser output optical device, a laser, equipment and a method. The laser output optical device comprises an output optical fiber, an optical waveguide and an optical output head which are connected in sequence, the output optical fiber is used for outputting point ring light beams, a cladding layer, wrapping the second fiber core, of at least partial area, close to the output optical fiber, of the optical waveguide comprises a second conical structure, and the cross section of the second conical structure is annular. The outer diameter of the second conical structure is gradually increased in the light beam transmission direction, and the second conical structure is used for adjusting the light path of the point ring light beam so as to adjust the divergence angle of inner and outer ring light beams. And the optical output head is used for outputting the light beam adjusted by the optical waveguide. The pre-modulated light from the output optical fiber is accurately regulated and controlled, the divergence angle of the output light is adjusted, the light beam quality is improved, and meanwhile the device has the advantages of being simple in structure, low in cost and high in stability.

The invention discloses a novel heterogeneous integrated light source adiabatic coupling structure, which comprises an active waveguide structure and a passive waveguide structure, and is characterized in that the passive waveguide structure comprises a flat silicon core and a ridge silicon core 003, one end of the ridge silicon core 003 is provided with a passive coupling section 011 of which the width is gradually reduced, and an active waveguide structure 002 is superposed above the passive coupling section 011; and an active coupling section 012 of the active waveguide structure 002 is wedge-shaped. Light is input into the passive coupling section 011 from the passive waveguide, the width of the ridge silicon core 003 of the passive coupling section 011 is gradually reduced, the width of the active coupling section 012 is gradually increased, in the process, the effective refractive index of the silicon waveguide is matched with that of the active waveguide, and part of optical signals enter the active coupling section 012 from the passive coupling section 011 in an adiabatic coupling mode. Through the conical coupling structure provided by the invention, extremely low loss transmission of light between the passive silicon waveguide and the heterogeneous integrated light source active waveguide can be realized, and the coupling loss between the passive silicon waveguide and the heterogeneous integrated light source active waveguide is effectively reduced.

The present invention relates to the field of optical fiber technology, and further to a wide-wavelength optical fiber array based on thin-film lithium niobate optical fiber. It comprises: a substrate, a dispersion compensator, an optical coupler and an optical fiber array; a lithium niobate thin film formed by lithium niobate deposition is disposed on the substrate; a waveguide structure is formed on the lithium niobate thin film by photolithography and etching; the optical fiber array comprises a plurality of optical fibers; the optical coupler is used to couple the optical signal in the waveguide structure to the optical fiber array or to couple the optical signal in the optical fiber array to the waveguide structure; the dispersion compensator is used to perform dispersion compensation on all optical fibers in the optical fiber array. The present invention solves many problems in the prior art, such as insufficient dispersion compensation, signal distortion and signal loss caused by nonlinear effects, etc.

The invention belongs to the technical field of optical devices, and discloses a micro-ring filter and a design method thereof. The method comprises the following steps: establishing a simulation model of a micro-ring filter by utilizing a three-dimensional time domain finite difference algorithm, wherein the micro-ring filter comprises a micro-ring region and a coupling waveguide region; according to a set free spectral range and a set coupling coefficient, the fundamental mode transmittance is taken as an optimization target, the first curve is taken as a waveguide center curve, the width of the waveguide is adjusted by utilizing a second curve, and a micro-ring region and a coupling waveguide region are reversely designed; and iteratively optimizing to obtain a group of optimal micro-ring structure parameters and a group of optimal coupling waveguide structure parameters, and finishing the design of the micro-ring filter. According to the invention, the free spectral range can be obviously improved, and the loss performance of the micro-ring filter is improved.

This invention belongs to the field of laser technology, specifically relating to a common-cathode multi-beam laser, comprising a cathode assembly, multiple anode assemblies, an optical resonant cavity assembly, and a power supply module. The power supply module is electrically connected to both the cathode and anode assemblies, providing operating voltage to them. Multiple anode assemblies are spaced apart above the cathode assembly. The optical resonant cavity assembly, positioned above the anode assemblies, includes multiple mirrors and an output mirror. Each mirror corresponds to one of the anode assemblies, forming multiple independent optical resonant cavities together with the output mirror. The common-cathode design allows multiple anode assemblies to share the same cathode, greatly simplifying the laser structure and significantly reducing the device size and production costs compared to traditional multi-beam lasers with multiple independent laser units.

The application discloses a mode spot converter based on proton exchange and a lithium niobate film, which comprises a lithium niobate film, a proton exchange waveguide, a silicon dioxide waveguide, wherein the lithium niobate film comprises a stepped film section, a flat film section and a last film section; the stepped film section has multiple steps, the tread of each step is a plane, and the kick of each step is a concave curve; the tread of the highest step of the stepped film section is flush with the top surface of the flat film section; and the last film section forms an LN ridge waveguide; the proton exchange waveguide is formed on the stepped film section and the flat film section of the lithium niobate film; the stepped film section forms a stepped section of the proton exchange waveguide, and the flat film section forms a transition section of the proton exchange waveguide; and the silicon dioxide waveguide serves as an upper cladding layer of the stepped section of the proton exchange waveguide. The application is used for end face coupling between a chip and an external optical fiber, and has the advantages of high transmission efficiency, small light leakage and low transmission loss.

The invention relates to a photonic crystal fiber of a coupling lens, and belongs to the technical field of microstructure optical fibers. The photonic crystal fiber and the lens are welded, so that the light beam collimation emergent condition can be met, the light beam collimation emergent position and the property of an output light beam can be flexibly adjusted according to needs, and the adjustability of optical fiber output is improved; the design and manufacturing difficulty of the photonic crystal fiber is reduced, meanwhile, the problem that the photonic crystal fiber is prone to being blocked, damaged and polluted is solved, and light beam auto-collimation emergence is achieved so as to improve the coupling efficiency.

The application provides a backside incidence and top reflection integrated fiber-waveguide coupler, which comprises a substrate, an SOI substrate, a linearly variable grating device, a reflection cavity structure, a lens focusing fiber and a fiber fixing assembly, wherein the SOI substrate is arranged on the top surface of the substrate, the linearly variable grating device is arranged on the SOI substrate, the reflection cavity structure is arranged above the grating waveguide in the linearly variable grating device and is used for reflecting the uncoupled light back to the grating area to enhance the coupling efficiency, and the lens focusing fiber and the fiber fixing assembly are arranged on the back surface of the substrate, so that the incident light signal enters the grating waveguide part of the grating area through the back surface of the substrate at a preset inclination angle. The fiber-waveguide coupler of the application can improve the coupling efficiency, widen the coupling bandwidth, release the front surface space of the chip, and is beneficial to high-density photon integration and low-temperature environment application.

The invention relates to the technical field of semiconductor lasers, in particular to a laser based on annular resonant cavity and grating fiber coupling. The annular optical gain ring optical waveguide is arranged on the upper end face of the substrate; the top positive electrode is plated on the upper end surface of the optical waveguide of the annular optical gain ring; the bottom negative electrode is plated on the lower end surface of the substrate; the Bragg grating optical fiber is arranged on the upper end face of the substrate 1, and the Bragg grating optical fiber wraps part of the annular optical gain ring optical waveguide from the outside; the HR high-reflection film is plated on the end face, deviating from the light output direction, of the Bragg grating optical fiber; and the AR film is plated on the end face of the Bragg grating fiber in the light output direction. The method has the following beneficial effects: 1, the process is simplified, and the cost is reduced; 2, the coupling loss is extremely low; 3, the line width is narrow and the monochromaticity is high; and 4, the structural stability is high.

The invention discloses a dodging optical fiber bundle for projection and laser platemaking and a preparation method thereof, and relates to the technical field of optical fiber bundle processing, the optical fiber bundle is composed of a conventional circular optical fiber structure and a polygonal optical fiber structure subjected to hot melting processing, the optical fiber bundle is composed of a plurality of single optical fibers, the front section and the rear section of each single optical fiber are respectively a round optical fiber body and a polygonal optical fiber body, the polygonal section of each polygonal optical fiber body is the same as the polygonal section of the rear section part, and the position and the length between the round optical fiber body and the front section part of the optical fiber bundle are correspondingly matched with the position and the length between the polygonal optical fiber body and the rear section part. A traditional dodging rod structure is replaced through a hot melting forming process, coupling loss between light beams is effectively reduced, and the dodging optical fiber bundle has the advantages of being simple in structure, easy to implement, capable of effectively improving light beam uniformity, suitable for optical systems such as laser projection, printing and display equipment and the like and wide in application prospect.

This invention belongs to the field of solar energy utilization and underwater energy system technology, and discloses a design method for a multi-junction tandem photovoltaic structure adapted to underwater dynamic spectra. The steps are as follows: Underwater spectral data containing wavelength, irradiance, and attenuation coefficient are obtained through actual measurement or simulation; ultraviolet and infrared strong absorption bands are eliminated by filtering and normalization to determine the effective spectral range; a spectral-bandgap matching model is established, and the optimal bandgap combination is calculated using a genetic algorithm; structural parameters are determined, and a four-terminal electrical structure is adopted with independent MPPT maximum power point tracking. By focusing on the 400–700nm blue-green main effect band to optimize the dual-junction / triple-junction bandgap combination, the spectral utilization rate is improved by 20% compared to single-junction photovoltaics, and the theoretical efficiency of the triple-junction structure reaches 70%, achieving precise matching between the underwater dynamic spectrum and the multi-junction photovoltaic bandgap; the use of a four-terminal independent electrical structure with independent MPPT reduces electrical coupling losses, and the charging time is significantly shortened compared to traditional series / parallel structures, with a maximum reduction of 42.86% for dual-junction systems and a maximum reduction of 74.12% for triple-junction systems.

This invention relates to the field of superconducting composite wire and cable processing technology, and discloses a method for preparing a low-loss, high-thermal-conductivity NbTi superconducting cable, including the preparation of a single-core ingot. The single-core ingot is welded, extruded, and drawn to obtain a single-core rod. Subsequently, the single-core rod is assembled, welded, extruded, and drawn to obtain a composite rod. A copper tube containing a high specific heat material is placed in the core of an oxygen-free copper tube, and oxygen-free copper inserts are used to fill the internal gaps of the oxygen-free copper tube. Then, combined with drawing and multiple aging heat treatments, a composite wire is obtained. One oxygen-free copper tube is used as the central component, and six composite wires are placed around it; the wires are then stranded to obtain a superconducting cable. This invention introduces a Cu tube between the NbTi rod and CuNi in the single-core ingot, effectively conducting the heat generated by the NbTi core wire. A copper tube containing high specific heat powder is introduced into the core of the composite wire. During stranding, a thin copper tube is used instead of copper wire in the central region, achieving the dual effect of "core wire thermal conductivity + core wire isolation to reduce coupling loss".

A method for forming an optical device, comprising: providing a substrate, the substrate comprising a coupling region; forming a first dielectric layer on the substrate; forming an initial waveguide trench in the first dielectric layer on the coupling region; forming a patterned layer on the surface of the first dielectric layer and in the initial waveguide trench, the patterned layer exposing at least a portion of the bottom of the initial waveguide trench; etching the first dielectric layer using the patterned layer as a mask to form a waveguide structure on the substrate, the waveguide structure comprising a waveguide end structure on the coupling region. The method for forming the semiconductor structure improves the process stability of small-size waveguides, reduces the coupling loss during light propagation, and improves the light propagation efficiency.

The utility model discloses a high repetition frequency light source simulation device which comprises a light box, the interior of the light box is of a hollow structure, the cross section of the light box is of a fan-shaped structure, a plurality of light inlets are formed in one side of the large end of the light box, a light outlet is formed in one side of the small end of the light box, and the center lines of the light inlets intersect at one point and are located on the center line of the light outlet. The side, close to the light outlet, of each light inlet of the lamp box is provided with a light path channel in an extending mode. An optical fiber laser is mounted at each light inlet and is used for emitting a laser light source; and an optical fiber receiver is arranged at the light outlet and is used for receiving a laser light source emitted by each optical fiber laser. Laser light sources with different frequencies and wavelengths are emitted through a plurality of optical fiber lasers and are coupled to an optical fiber receiver, so that the optical fiber receiver directly obtains high repetition frequency pulses with different levels, the optical fiber coupling loss is reduced, and an all-optical fiber structure simulation test of the high repetition frequency light source is realized.

The invention discloses an electromagnetic ultrasonic sensor and electromagnetic ultrasonic detection equipment, the sensor comprises a shell and a sensing assembly, the sensing assembly comprises a magnet and a coil, the magnet comprises a cylindrical magnetic core and an annular magnetic ring surrounding the magnetic core, and the coil is in a concentrically coiled circle shape and is flatly laid below the magnet; in the left side part of the magnetic core, the upper half part is an N pole, the lower half part is an S pole, in the right side part, the upper half part is an S pole, and the lower half part is an N pole; in the left side part of the magnetic ring, the half located on the inner side is an S pole, the half located on the outer side is an N pole, in the right side part, the half located on the inner side is an N pole, and the half located on the outer side is an S pole. The sensor still has enough magnetic field intensity and detection sensitivity under the condition that the size is reduced, and detection operation can still be carried out in a narrow space.

This invention discloses a quasi-single-mode VCSEL / hollow-core fiber coupling optical fiber, coupling interface, and fabrication method. The coupling fiber includes a thin-diameter outer diameter fiber segment, a first fiber segment, a higher-order mode filtering fiber segment, and a second fiber segment. The thin-diameter outer diameter fiber segment supports few-mode transmission at a wavelength of 850nm, and its core diameter is close to the aperture diameter of the quasi-single-mode VCSEL. The inner diameter of the first fiber segment is the same as that of the thin-diameter outer diameter fiber segment, but its outer diameter is larger. The higher-order mode filtering fiber segment operates in the same wavelength band as the quasi-single-mode VCSEL and transmits in single-mode at this wavelength. The end of the second fiber segment is treated with a tapered heat-diffusion core to gradually expand its fundamental mode field diameter to match that of the hollow-core fiber. This invention, through a unique all-fiber structure, couples the signal light from an 850nm quasi-single-mode VCSEL into a hollow-core fiber link with low delay, low dispersion, and low loss.

The invention discloses a low-loss edge coupling structure based on compounding of a trigeminal waveguide and a sub-wavelength grating, and belongs to the field of optoelectronic integration. The trident waveguide is composed of a middle waveguide in the middle and side waveguides on the two sides, the outer side of each side waveguide is provided with a section of sub-wavelength grating, the central axes of the sub-wavelength gratings and the side waveguides incline towards the center by a certain angle, and the two side waveguides and the two sub-wavelength gratings are symmetrically arranged on the two sides of the middle waveguide. According to the structure, the unique trident layout is combined with the sub-wavelength grating, and an external large-spot light field can be effectively converted into a waveguide-supported single-mode field in an adiabatic manner, so that high coupling efficiency, large alignment tolerance and good process compatibility are realized.

According to the quasi-single-mode VCSEL / hollow-core optical fiber coupling optical fiber, the coupling interface and the manufacturing method, the coupling optical fiber comprises a small-outer-diameter optical fiber section, a first optical fiber section, a high-order mode filtering optical fiber section and a second optical fiber section, the small-outer-diameter optical fiber section supports few-mode transmission at the wavelength of 850 nm, and the diameter of a fiber core of the small-outer-diameter optical fiber section is close to the aperture of a light outlet hole of a quasi-single-mode VCSEL; the inner diameter of the first optical fiber section is the same as that of the small-outer-diameter optical fiber section, and the outer diameter of the first optical fiber section is larger than that of the small-outer-diameter optical fiber section; the working wave band of the high-order mode filtering optical fiber section is the same as that of the quasi single-mode VCSEL, and the high-order mode filtering optical fiber section is in single-mode transmission in the wave band; the tail end of the second optical fiber section is processed through the conical thermal diffusion core, so that the fundamental mode field diameter of the second optical fiber section is gradually expanded to be matched with the hollow-core optical fiber mode field diameter. According to the invention, through a unique all-fiber structure, signal light of the 850nm quasi-single-mode VCSEL is coupled into a hollow-core fiber link in a low-delay, low-dispersion and low-loss manner.

The invention discloses an adjustable edge coupler, belongs to the technical field of edge couplers, and can solve the problem that the coupling performance of the edge coupler is severely influenced due to the fact that an optical waveguide and a fiber core of an optical fiber of an existing edge coupler are difficult to align accurately. The edge coupler comprises a substrate, the upper surface of which is provided with a strip-shaped groove; one end of the strip-shaped groove penetrates through the substrate; the buried oxide layer is arranged on the substrate, and a first through groove and a second through groove which are communicated with the strip-shaped groove are formed in the positions, corresponding to the strip-shaped groove, of the buried oxide layer; the part, between the first through groove and the second through groove, of the buried oxide layer forms a cantilever beam; the optical waveguide is arranged on the cantilever beam, one end of the optical waveguide is conical, and the tip of the cone is located at the free end of the cantilever beam; and the adjusting module is arranged on the buried oxide layer and is used for adjusting the position of the optical waveguide. The invention is used for coupling between the optical fiber and the chip.

The utility model discloses a small -size light -gathering tracking lighting system device relates to lighting engineering technical field, aims at solving current optical fiber indoor lighting equipment coupling efficiency low technical problem, including the light -gathering structure for converging natural light and forming the focusing light spot, the transmission structure for transmission light energy of light -gathering structure output and the biaxial tracking drive structure for connecting light -gathering structure and transmission structure, biaxial tracking drive structure includes horizontal vertical transmission motor box. The utility model discloses through the synergic design of light -gathering structure, transmission structure and biaxial tracking drive structure, both with the aid of large -scale flat convex optical lighting lens high -efficient convergence natural light and form the focusing light spot, and through the intelligent light sensor fixed on its outside semicircular support, ensure that light -gathering structure is always in the best light -gathering posture, and rely on the light ray fusing whole light receiving end high -efficient receiving and transmission focusing light energy, effectively solved the problem of traditional device light -gathering not accurate, light energy transmission loss big.