89 results about "Coupling loss" patented technology

The invention discloses a hollow-core fiber fusion coupling loss evaluation method and device, and the method comprises the steps: firstly collecting a cross-section image of a first hollow-core fiber fusion end, enabling laser to pass through the cross-section image, then collecting a light field distribution image of emergent light of the fusion end, and carrying out the fitting, thereby obtaining a nested tube circumcircle and a light field fitting regular polygon; welding the two hollow-core optical fibers, and acquiring a cross-section image of a non-welding end of the second hollow-core optical fiber and a light field distribution image after the laser is introduced to complete the same fitting; and finally, inputting the related geometric parameters before and after welding into a preset evaluation model to obtain welding loss. According to the invention, accurate and real-time evaluation of the welding loss is realized.

The application provides an optical coupler applied to the field of optical communication. The optical coupler comprises a buried layer, a support layer, a waveguide layer and an upper cladding layer. In the height direction, the support layer is between the buried layer and the waveguide layer. The waveguide layer is between the support layer and the upper cladding layer. In the width direction, the waveguide layer and the support layer are inside the upper cladding layer. The materials of the waveguide layer and the support layer are different. In the application, the support layer is inside the upper cladding layer. Therefore, the upper cladding layer is on both sides of the support layer. The energy of the optical signal can be dispersed on both sides of the support layer, so that the degree of uneven energy distribution near the center of the waveguide layer is reduced, and the coupling loss of the optical coupler is reduced.

The present invention relates to the technical field of optical communication. Disclosed are a coupling method and coupling structure for a hollow optical fiber, and an optical fiber connector. The method of the present invention comprises the steps of: welding a first optical fiber with a first end surface of a bridge fiber, processing a second end surface of the bridge fiber into an inclined surface at a preset angle to serve as a coupling end surface, and fixing the overall structure obtained by welding the first optical fiber with the bridge fiber in a first sleeve to obtain a first intermediate; fixing the hollow optical fiber in a second sleeve to obtain a second intermediate; and clamping and fixing the first intermediate and the second intermediate by using an optical fiber coupling platform, adjusting the position of the first intermediate and / or the second intermediate, synchronously performing a powder test, and encapsulating and fixing coupling points when the coupling loss is at the minimum, thereby achieving the coupling of the hollow optical fiber and the first optical fiber. The present invention expands the application scenarios, and reduces the coupling loss and return loss.

The invention belongs to the technical field of terahertz, relates to terahertz communication, and particularly discloses a quasi-optical resonant cavity and a terahertz pulse compression system. According to the invention, the pulse generation module and the coupling compensation module are connected in parallel and are connected to the common reflector through the common coupler, so that function decoupling is realized. In a pulse compression stage, the common coupler introduces an incident terahertz wave beam into two optical paths, and destructive interference occurs between two paths of leakage signals by adjusting the coupling compensation module, so that zero coupling loss is realized, and the problem of large energy loss is solved. Meanwhile, the pulse generation module can independently adjust the optical path of the pulse generation module to control the pulse width, and the adjustment process does not affect the optimized interference condition, so that the high robustness of adjustment is ensured. In the output stage, energy is released by switching the state of the common coupler. Compared with the prior art, low-loss accumulation and robust pulse width continuous adjustment are realized at the same time, so that the terahertz pulse compression effect is remarkably improved.

The invention relates to the technical field of coupling device design and manufacturing, in particular to an interlayer coupler with a multi-layer waveguide structure and a manufacturing method of the interlayer coupler. The interlayer coupler comprises at least three layers of stacked waveguide structures, the lowermost waveguide structure is a silicon waveguide, and the refractive indexes of the waveguide structures are gradually reduced from bottom to top. The refractive index of each layer of waveguide structure which is arranged in a laminated manner is set to be gradually reduced, so that optical signals can be more stably transited when being transmitted among different waveguide layers, the reflection and scattering phenomena caused by sudden change of the refractive index are effectively avoided, optical loss caused by sudden change of the refractive index is greatly reduced, and the optical transmission efficiency is improved. The coupling loss of the interlayer coupler is significantly reduced, and the optical transmission efficiency of the interlayer coupler is greatly improved. And the mode field matching degree can be effectively improved, the problem of mode field mismatching is solved, and the coupling loss of the light field is further reduced.

The utility model relates to a lithium niobate end face coupler, including substrate: the lower cladding layer, covering layer are sequentially equipped from below to above on the substrate, the upper end of lower cladding layer is sequentially equipped with first flat plate structure and first waveguide structure from below to above, and first waveguide structure is located the upside of bottom layer first flat plate structure, and first flat plate structure and first waveguide structure are located in covering layer, and first flat plate structure includes first flat plate layer and the second waveguide structure located the upside of first flat plate layer, wherein, the thickness of first flat plate layer is 1nm 30nm, and the thickness of first flat plate layer is less than the thickness of second waveguide structure, the utility model discloses a lithium niobate end face coupler adds first flat plate layer, significantly reduces the coupling loss of thin film lithium niobate end face coupler, is favorable to the mass production of lithium niobate end face coupler.

The application relates to the technical field of laser lighting, in particular to a non-electric manual laser switch and a using method thereof, and aims to solve the problems of poor explosion-proof performance, high laser leakage risk, large coupling loss and stray light interference of an existing laser switch. The switch is connected in series between a light fiber at a light emitting end of a laser and a light fiber at a receiving end of a lighting system, and comprises a manual operating mechanism, a double-lens assembly, a high-precision positioning pin, a light cone assembly, a stray light protection piece and a shell. The switch realizes light path on-off through pure mechanical manual operation. When the switch is turned on, the double lens is accurately aligned through the positioning pin, and laser is coupled and transmitted with low loss. When the switch is turned off, the light cone absorbs laser on the laser side, and the stray light protection piece blocks external stray light. The switch does not have any electrical components, meets the Exd IIC T6 explosion-proof grade, has a coupling loss of less than or equal to 0.2 dB, has laser leakage of less than or equal to 0.01 mW when turned off, is suitable for environments of-40 DEG C to 85 DEG C, and is suitable for explosion-proof scenes such as natural gas pipe corridors and chemical industrial parks. The switch is convenient to operate and has a long service life.

This invention belongs to the field of optical component mounting technology, specifically a real-time coaxial optical coupling loss detection and alignment system for prisms and lens arrays. It includes an automatic loading and unloading module for automatically loading the substrate, prisms, and lens arrays, and automatically sorting and unloading qualified and unqualified products. By adopting a technical solution that uses the real-time coaxial optical coupling loss detection value as the sole criterion for final alignment of the lens array, combined with a graded alignment strategy of visual coarse alignment and coaxial optical fine alignment, it solves the common industry pain point of existing pure visual alignment and passive alignment technologies that separate physical dimensional accuracy from optical performance. This results in the inability to compensate for manufacturing errors such as uneven refractive index and surface flatness deviations within optical components, leading to substandard optical performance despite meeting physical accuracy standards and low yield rates in mass production. By using dimensional and angular tolerances only as auxiliary constraints, it directly locks the global minimum coupling loss point, improving the consistency and stability of the product's optical performance.

The invention discloses an optical interface structure of an integrated photonic chip for a fiber-optic gyroscope and an optical coupling method, and belongs to the technical field of integrated optics and optical fiber sensing. All input and output ports of the integrated photon chip are arranged on a coupling end face on the same side of the chip, the ports comprise at least two signal ports and two auxiliary ports, the signal ports are used for connecting tail fibers of polarization maintaining fiber rings of all measuring axes of the fiber-optic gyroscope, and the auxiliary ports are connected with a through type auxiliary coupling optical channel in the chip; each port is integrated with a spot size adaptation unit, and the spot size adaptation unit is used for matching the spot size of the polarization maintaining optical fiber and the chip waveguide; the integrated photon chip realizes single-side end face alignment coupling with the multi-channel polarization-maintaining optical fiber array through the coupling end face, tail fibers of polarization-maintaining optical fiber rings of all measuring axes of the optical fiber gyroscope are directly solidified in the multi-channel polarization-maintaining optical fiber array, a head channel and a tail channel of the multi-channel polarization-maintaining optical fiber array are aligned with two auxiliary ports of the chip respectively, and no extra welding link is needed. According to the invention, the problems of dispersed channel-by-channel coupling of optical interfaces, complex alignment of two-side FAs, large dual-link coupling loss, serious polarization cross coupling and uncontrollable coupling quality are solved, the overall precision and environmental stability of the fiber-optic gyroscope are remarkably improved, the method is suitable for various fiber-optic gyroscopes with single axes, multiple axes and the like, and the system integration level and the assembly consistency are remarkably improved.

The invention discloses a photoelectric chip with power attenuation regulation and control and real-time monitoring functions. The photoelectric chip comprises a coupling waveguide, a connecting waveguide, a light beam splitting structure and a variable optical attenuator, an optical signal enters the chip through the input coupling waveguide and is transmitted to the optical beam splitting structure through the first connecting waveguide, the optical beam splitting structure divides the optical signal into a monitoring signal and a main transmission signal, and the monitoring signal is transmitted to the first variable optical attenuator through the optical beam splitting structure and the second connecting waveguide in sequence and then is connected to the photoelectric detection system through the monitoring output coupling waveguide. The main transmission signal is transmitted to the second variable optical attenuator through the optical beam splitting structure and the third connection waveguide in sequence, and then is transmitted back to the original optical fiber link through the main signal back-transmission coupling waveguide. The chip disclosed by the invention can be prepared on a large scale by adopting a standard micro-nano process, is low in coupling loss and high in compatibility, can be customized on a single chip or in an array manner, is accurate in monitoring and convenient to install, and can be widely applied to real-time monitoring and attenuation regulation and control of links in the fields of optical fiber communication, optical sensing and the like.

The invention provides an on-chip optical sensor for medical detection and a manufacturing method thereof, and relates to the technical field of on-chip optical sensors. According to the scheme, the device mainly comprises a substrate, a double-peak waveguide interference structure, a near-infrared photoelectric detector and a micro-fluidic channel, the double-peak waveguide interference structure is arranged on the upper surface of the substrate, comprises a waveguide layer and is used for amplifying refractive index change and outputting an interference signal; the micro-fluidic channel and the near-infrared photoelectric detector are respectively arranged in a sensing area and an output area on the upper surface of the waveguide layer; recognition molecules are arranged in the micro-fluidic channel and are used for being specifically combined with target molecules of a medical sample and generating refractive index change; and the near-infrared photoelectric detector is used for reading the interference signal and converting the interference signal into an electric signal. According to the scheme, the machinable absorption layer is directly integrated in the evanescent field area of the double-peak waveguide, on-chip direct reading of waveguide interference signals is achieved, coupling loss is reduced, and the signal-to-noise ratio is remarkably increased.

The utility model discloses an O wave band end face coupler based on a silicon nitride multi-cone waveguide. The O wave band end face coupler is characterized in that a waveguide layer is composed of three double-cone input waveguides, two double-cone waveguides, a single-cone waveguide and a straight waveguide connected with the single-cone waveguide; according to the utility model, through the introduction of the multi-conical structure of the biconical input waveguide, the biconical waveguide and the single-conical waveguide, the mode mismatch between the waveguides and the optical fiber is effectively reduced, so that the loss caused by mode adaptation is reduced, the efficient optical coupling between the optical fiber and a chip is realized, and the structure between the waveguides is compact; only single exposure and etching are needed, the process complexity is reduced, the coupling loss in the O wave band is low, and the bandwidth is large.

The invention relates to a multi-modal fusion projection-based bearing fault diagnosis method under strong noise and variable working conditions, and belongs to the technical field of bearing fault diagnosis, and the method comprises the following steps: S1, collecting vibration and current signals, and carrying out the frequency domain transformation; s2, fusing vibration and current features by using a dual-path current guide vibration feature fusion strategy; s3, introducing a learnable class adaptive projection matrix, and mapping the fused features to a subspace with an invariable operation state; and S4, constructing an encoder-projection coupling loss function, and realizing joint optimization of the dual-path encoder and the class adaptive learnable projection matrix, so that the model can learn representation with a constant operation state and class discrimination degree at different rotating speeds, and diagnosis and classification are performed on bearing faults.

The present disclosure provides a planar lightwave circuit that enables a reduction in coupling loss upon connection to an optical element. Specifically, provided is a planar lightwave circuit characterized in that: the thickness of part of a core layer varies symmetrically with respect to the center of a core cross-section obtained by horizontally cutting the core layer in the thickness direction thereof; and the center position of each input port of two or more optical waveguides is located at the same height from the bottom surface of a lower cladding layer, or the center position of each output port of two or more optical waveguides is located at the same height from the bottom surface of the lower cladding layer.

A thin film lithium niobate waveguide scattering and absorption loss spectrum separation detection method comprises the following steps: acquiring transmission loss of a thin film lithium niobate waveguide under different wavelengths and an energy distribution ratio of each wavelength guided mode in different media so as to determine a total transmission loss and a mode field space energy ratio; and constructing a space energy attribution model based on the total transmission loss and the mode field space energy ratio. In the space energy attribution model, an interface coupling loss item is introduced, and a loss dominant interval is established according to the interface coupling loss item. And extracting a loss spectrum in the loss dominant interval, and carrying out consistency verification on the loss spectrum by taking a mode field space energy proportion as a weight so as to output a scattering loss spectrum and an absorption loss spectrum. Under the condition of a high leakage field, even if surface absorption and scattering coupling loss caused by cladding surface pollution, moisture adsorption and interface defects does not meet the linear superposition relation any more, the accuracy of waveguide detection can be guaranteed.

The invention relates to a preparation method of a high-speed EML laser chip, which belongs to the technical field of semiconductor manufacturing, and comprises the following steps: S1, depositing a silicon dioxide film on an epitaxial wafer; s2, uniformly coating photoresist on the epitaxial wafer, performing photoetching by using an exposure machine, simultaneously defining a pattern of a shallow etching waveguide and a pattern of a deep etching waveguide in the photoetching step, performing exposure, and forming a corresponding photoresist mask on the upper surface of the epitaxial wafer; s3, etching the initial mask layer to form a silicon oxide mask pattern with the same shape as the photoresist mask; s4, etching the DFB part and the EAM part for the first time to obtain a self-aligned DFB ridge waveguide structure and an EAM shallow ridge waveguide structure; s5, uniformly coating the photoresist again, exposing and removing the photoresist above the DFB part; s6, depositing silicon dioxide on the epitaxial wafer; step S7, stripping silicon dioxide above the photoresist; and S8, etching the EAM part for the second time to obtain a DFB ridge waveguide structure and an EAM ridge waveguide structure which are strictly aligned, so that the coupling loss can be effectively reduced.

The invention discloses a time-frequency consistency electroencephalogram signal generation method and system based on distance constraint. A composite loss function containing three losses of time-distance coupling, frequency-distance coupling and phase synchronization is designed. Time-distance coupling loss is weighted according to the distance between the electroencephalogram virtual channel and the source channel, and the consistency of signals of the electroencephalogram virtual channel far away from the source channel and real signals in the time domain is enhanced; frequency-distance coupling loss, amplitude consistency between an electroencephalogram virtual channel signal with a short strengthening distance in a low frequency band and a real signal, and frequency consistency between an electroencephalogram virtual channel signal with a long strengthening distance in a high frequency band and the real signal; according to the phase loss item, the phase synchronism is strengthened in a specific frequency range for the task state electroencephalogram signals, and the method is suitable for a task state scene. According to the method, the time-frequency domain consistency, the channel distance and the task state phase coherence of the generated signals are fully considered, and the signal generation quality of the electroencephalogram virtual channel (especially the far end) is effectively improved.

The invention discloses an optical fiber coupling efficiency improving method based on a bat algorithm. The method comprises the following steps that optical power data are collected and preprocessed; constructing a coupling parameter search space model; initializing an improved submerged space enhancement-bat algorithm, and outputting an initial coupling parameter vector; introducing countercurrent coding to generate a submerged space vector; calculating and outputting an optimal action vector through a differentiable strategy flow mapping mechanism; obtaining a current iteration optimal bat individual; outputting a coupling parameter vector of the global optimal bat individual; and the improved submerged space enhancement-bat algorithm is recalled to perform parameter optimization calculation, so that the optimization speed and the global optimal stability of optical fiber coupling are effectively improved, the coupling loss is remarkably reduced, and the automatic adjustment precision and the optical power stability of the system are improved.

This invention relates to the field of polymer waveguide fabrication technology, specifically disclosing a method for processing a 45° micromirror on the end face of a polymer waveguide, comprising the following steps: Step S1: Determining the forming quality characterization of the 45° micromirror on the end face of the polymer waveguide; Step S2: Determining the initial range of influencing factors affecting the quality of the 45° micromirror on the end face of the polymer waveguide fabricated by femtosecond laser; Step S3: Determining the laser incident mode, using a waveguide substrate tilted at 45° to the horizontal plane, with the laser incident perpendicular to the horizontal plane; Step S4: Optimizing the influencing factors to obtain the optimal parameter combination; Step S5: Conducting experiments with the optimal parameter combination, detecting and analyzing the experimental results. The femtosecond laser fabrication of the 45° micromirror on the end face of the waveguide of this invention results in small surface roughness and angle deviation, leading to higher integration, greater transmission efficiency, and lower coupling loss in the link formed by coupling the polymer waveguide and optical transceiver devices.

A method for performing in-band spectrum sharing in a mixed TN-NTN system is provided. The method is performed by a user equipment (UE). The UE receives reference signal (RS) configuration information from a satellite or TN base station and obtains measurement results indicative of coupling loss or interference based on the RS configuration. The UE transmits a measurement report to the satellite or an uplink RS to the TN base station for resource allocation decisions. The UE operates according to resource allocation results indicating a partition of shared radio resources across frequency, time, or polarization domains to mitigate interference. Finally, the UE communicates using the allocated resource portion of the shared radio resources.

The invention discloses a PC type MPO convex lens coupling assembly. According to the coupling assembly, when the two MPO movable connectors are coupled together, light beams in the multiple optical fibers in the two MPO movable connectors are focused through the convex lens in the coupling assembly, so that the mode field diameter in optical fiber transmission is reduced, the multiple optical fibers of the two MPOs are more easily in butt joint, and the coupling loss is reduced to the minimum. Meanwhile, in a link, if the MPO coupler is provided with the assembly, management and operation of the MPO movable connector can be simplified, one connector does not need to be changed to be provided with a pin, and the risk that the MPO movable connector is damaged in the guide pin installation process is avoided.

The invention relates to an optical microcavity with an on-chip support and a packaging method thereof.The optical microcavity with the on-chip support comprises a substrate, an optical microcavity body and an on-chip fork supporting structure, the forked end of the on-chip fork supporting structure comprises two prong structures, the tail ends of the prong structures face the optical microcavity body, and the prong structures are arranged on the substrate. And the roots of the fork tooth structures are combined into a single-beam structure which is fixedly supported on the substrate. On-chip supporting in the optical microcavity packaging process can be achieved, the coupling stability is obviously higher than that of an optical microcavity sample without on-chip supporting, and the influence of curing of ultraviolet curing glue on coupling loss is greatly reduced.

This invention discloses a thin-film lithium niobate silicon optical integrated chip and its fabrication method. The thin-film lithium niobate silicon optical integrated chip sequentially comprises a metal-free silicon photonic base chip, a thin-film lithium niobate waveguide layer bonded thereon, a silicon dioxide cladding covering the chip, and at least two functionally separated metal layers located above the cladding. The first metal layer serves as an electrical contact and modulation electrode, and the second metal layer is interconnected with the first layer via a visor and serves as a traveling wave electrode. The fabrication method is used to fabricate the thin-film lithium niobate silicon optical integrated chip. Advantages: In this invention, the silicon photonic base chip does not contain any metallization layer (except for metal silicides) before bonding to the thin-film lithium niobate layer, thus ensuring the flatness of the bonding interface and bonding quality, and reducing interlayer coupling loss.

The invention provides a semiconductor laser module and a preparation method thereof. The semiconductor laser module comprises a plurality of rows of chips and an optical shaping assembly. The optical shaping assembly comprises a space beam combining part, and the space beam combining part comprises a plurality of transmission beam combining parts. Each transmission beam combining part is used for forming light beams emitted by the corresponding row of chips into transmission light beams, so that the coupling loss is reduced, and the photoelectric efficiency is improved; the semiconductor laser module can be used for combining multiple rows of light beams, and the manufacturing cost of the transmission beam combining component is low.

The application discloses an anti-vibration CPO optical coupling fixing structure and a preparation method thereof. The structure comprises a silicon base material, a three-stage buffer slope positioning groove is formed in the silicon base material, and the three-stage buffer slope positioning groove comprises a guiding area, a stress release area and a locking area in sequence. A metallization layer is arranged on the inner wall of the locking area, and an optical fiber is metallurgically combined with the metallization layer through AuSn eutectic solder. MEMS cantilever stress compensators composed of U-shaped cutting gaps and silicon island cantilevers are arranged on both sides of a fiber entry point of the positioning groove on the silicon base material. The preparation method comprises silicon base positioning groove etching, metallization treatment, optical fiber eutectic bonding and MEMS cantilever processing. Through the synergistic effect of the three-stage buffer positioning groove, eutectic solder rigid fixing and the MEMS cantilever stress compensation, the coupling loss fluctuation is less than or equal to 0.2 dB under 50G high impact, typical equipment vibration frequency bands are effectively isolated, and the alignment offset problem of the optical fiber and the photonic chip coupling interface in an extreme environment is solved.

The present application relates to the technical field of capacitor testing, and particularly relates to a full working condition equivalent testing system and method for a capacitor used in direct current transmission. The method comprises the following steps: applying a single frequency AC component on the capacitor to obtain a single frequency loss baseline inherent to the capacitor under single frequency excitation; determining harmonic coupling loss according to the single frequency loss baseline; screening out strong interactive harmonic pairs according to the harmonic coupling loss, and re-measuring additional loss under the conditions of respectively applying controlled thermal gradient disturbance and mechanical resonance excitation to calibrate thermal field gain factor and mechanical vibration gain factor; and evaluating total loss under full working condition based on the thermal field gain factor and the mechanical vibration gain factor to obtain full working condition testing data. The present application realizes accurate evaluation and contribution decomposition of the loss characteristics of the capacitor under multiple physical fields and full working conditions.

This invention provides a method for forming a waveguide structure and a blazed grating. The method for forming the waveguide structure includes: step S11: providing a silicon material layer; step S12: etching a portion of the silicon material layer to form multiple steps on the surface of the silicon material layer; step S13: oxidizing the surface of the silicon material layer using a thermal oxidation process to form a silicon oxide layer; step S14: wet etching the silicon oxide layer; step S15: repeating steps S13 to S14 to make the surface of the stepped silicon material layer become a smooth slope shape. In the waveguide structure of this invention, the smooth slope of the silicon material layer can form a waveguide structure with gradually varying thickness, thereby reducing coupling loss.

The application discloses an electro-optical modulator, a preparation method thereof and a modulation test system, and relates to the technical field of optical communication. The electro-optical modulator comprises a field effect transistor and a micro-nano optical fiber. The field effect transistor comprises a silicon substrate, a dielectric layer, a heterojunction and an electrode layer which are sequentially stacked. The electrode layer comprises a source electrode and a drain electrode which are arranged at two ends of the heterojunction respectively. The micro-nano optical fiber comprises an input optical fiber, a first tapered transition optical fiber, a middle optical fiber, a second tapered transition optical fiber and an output optical fiber which are sequentially connected. The middle optical fiber has a fiber micro-ring with a ring structure, and the fiber micro-ring is arranged on the heterojunction. The electro-optical modulator is a full-fiber electro-optical modulator, and the coupling mode is simple. The electro-optical modulator replaces traditional section coupling or grating coupling with fiber-fiber light field coupling, thereby avoiding the problem of mode field matching. Evenly, the electro-optical modulator can realize plug-and-play, near-zero coupling loss optical interconnection and optical modulation. The electro-optical modulator has the advantages of fast modulation speed, low cost, high modulation bandwidth and the like.

In improving the power reception efficiency of wireless power transmission systems, optimizing the operation of rectifier circuits using MPPT control presents challenges depending on the magnitude of the received power, such as increasing the size of the circuit and imposing high voltage resistance requirements on the rectifier and charge control circuits. Furthermore, even if optimal operation of the rectifier circuit can be achieved, optimizing the charging of the energy storage elements remains difficult. Moreover, even with power transmission using retrodetective methods, measures are needed to ensure that the power is received without loss by the receiving antenna and to prevent a decrease in power reception efficiency. [Solution] Prioritizing the optimization of the rectifier circuit's operation, the charging current control unit sequence-controls the charging current of the linear charging control unit to maintain the burst mode operation of the buck-boost converter. Furthermore, the antenna system for receiving circularly polarized high-frequency power is arranged and grouped along the rotation direction of the circular polarization to connect the output voltages from each rectifier circuit in parallel without coupling loss and output them to the charging control unit.