11results about How to "Reduce coupling loss" patented technology

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 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.

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 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.

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.

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.