247 results about "Optical wavelength" patented technology

The invention discloses a temperature control and noise reduction method for an analog optical module, and relates to the technical field of data processing. The method comprises the following steps: collecting and preprocessing an original temperature signal, environment temperature time sequence data and an optical wavelength original detection value of an optical module; improving the LSTM model, constructing a junction temperature dynamic prediction model, and outputting prediction data; a pre-trained BP neural network is utilized to calculate the temperature compensation amount according to the real-time wavelength offset, and a PPO reinforcement learning algorithm is adopted to optimize with the temperature stability, the wavelength offset and the TEC power consumption as multiple targets to obtain an optimal PID parameter mapping table; and finally, predicting, compensating and optimizing parameters are fused, and control output for driving the TEC is generated through a multi-mode intelligent decision. The problems of insufficient control precision and response lag are effectively solved, cooperative high-precision control over the junction temperature and the emission wavelength of the laser is achieved, transmission noise is remarkably reduced, and meanwhile system energy consumption and the self-adaptive capacity are considered.

The invention discloses a hospital internal network security isolation method based on an all-optical network architecture. The method comprises the following steps: S1, dividing a hospital internal network into a plurality of virtual optical slices by using an all-optical network slicing technology; s2, performing time domain isolation by using an optical time domain multiplexing technology, and transmitting data on different optical wavelengths by using a wavelength selective switching technology; s3, monitoring and managing bandwidth allocation through a software defined network control platform; s4, traffic prediction and resource optimization are carried out based on a decision tree integration algorithm; s5, detecting potential anomalies and security threats by using the graph neural network; s6, abnormal behaviors are detected through an isolation forest algorithm, and abnormal traffic is marked and isolated; s7, recording a network traffic log through a block chain technology; and S8, when a network fault occurs, using an intelligent self-healing mechanism to automatically switch redundant optical path resources and recover the optical path. According to the invention, all-optical network slicing and artificial intelligence technologies are fully utilized, and security isolation and resource optimization of a hospital internal network are realized.

The invention discloses an intelligent quality inspection system for medicinal empty capsules, particularly relates to the field of intelligent detection, and comprises a multi-dimensional optical characteristic acquisition module, a dynamic thermodynamic response analysis module, a near infrared spectrum component inversion module, a multi-source data fusion decision module and a self-adaptive feedback optimization module. Omnibearing nondestructive detection of the capsule is realized through non-contact multispectral imaging and vibration response analysis, traditional destructive sampling loss is thoroughly avoided, and the multisource data fusion module integrates optical texture features, mechanical frequency domain energy density and near infrared spectrum inversion values based on the D-S evidence theory, so that the detection accuracy is improved. And the self-adaptive optimization module dynamically adjusts an optical wavelength weight, a mechanical sweep frequency range and a spectrum modeling parameter by applying reinforcement learning, is self-adaptive to fluctuation of different batches of gelatin materials and environmental interference, remarkably reduces a misjudgment rate and ensures continuous and stable operation of a production line.

Aspects of the subject disclosure may include, for example, receiving a plurality of modulated optical wavelengths generated from digital input data and unmodulated optical wavelengths. The one or more of the plurality of modulated optical wavelengths undergo an optical operation and are converted into one or more electrical signals. The optical operation increases a signal to noise ratio (SNR) of the one or more electrical signals to exceed an SNR threshold. Additionally, the one or more electrical signals are processed to produce digital output data. Other embodiments are disclosed.

The invention belongs to the technical field of photoinitiators, and particularly relates to a ketoxime ester photoinitiator as well as application and a photosensitive combination thereof. Compared with the prior art, the novel photoinitiator has the advantages that by introducing a sulfone phenyl specific structure to a ketoxime ester group and the like, excellent photosensitivity can be shown in the optical wavelength range of 280-400 nanometers, and compared with OXE-01 and OXE-02 commonly used in the market, the novel photoinitiator can show better photoinitiation efficiency under an ultraviolet visible (UV-Vi s) LED light source.

The invention discloses a multi-chip photoelectric hybrid interconnection optimization method and system, and belongs to the technical field of computers. The method comprises the following steps: determining optical interconnection power consumption data of each chip; determining electric interconnection power consumption data of each chip; determining an optical wavelength multiplexing factor of each chip; determining the optical channel capacity of each chip; calculating an overall photoelectric interconnection transmission energy efficiency ratio; and if the overall photoelectric interconnection transmission energy efficiency ratio is higher than a preset energy efficiency threshold, determining a photoelectric interconnection optimization scheme through a preset optimization model, and optimizing each chip according to the photoelectric interconnection optimization scheme. According to the scheme, optimization is carried out based on the energy efficiency threshold value, it is ensured that the system operates in a high-energy-efficiency state, unnecessary power consumption is reduced, and the operation cost is reduced. Through intelligent optimization, calculation and communication loads of different chips can be adjusted, and the throughput of the whole system is improved. Meanwhile, manual intervention is reduced, and the self-adaptive capacity of the system is improved.

One embodiment provides a computer system. The computer system includes a plurality of processing units, a plurality of memory channels, and an arrayed waveguide grating router (AWGR). A respective processing unit is coupled to an array of tunable optical transceivers. A respective memory channel is coupled to a plurality of memory banks. Each memory bank is associated with a unique optical wavelength and can be accessed via the corresponding wavelength. Each memory channel is coupled to an individual output port of the AWGR, and the tunable optical transceivers of each processing unit are respectively coupled to different input ports of the AWGR, thereby allowing each processing unit to communicate with any memory bank associated with any memory channel using an appropriate tunable optical transceiver tuned to the corresponding optical wavelength associated with the memory bank.

The invention discloses a wind driven generator intelligent monitoring method and device based on an optical fiber sensor, and the method comprises the following steps: 1, optical fiber signal transmission and analysis: installing an optical fiber grating sensor in an area where a blade, a bolt and an air gap are located, and enabling the optical fiber grating sensor to be connected with an optical fiber grating signal analysis module through an optical fiber coupler, the analysis module sends an optical signal to the sensor and receives an optical signal reflected by the sensor; the fiber bragg grating signal analysis module demodulates the received optical signal, analyzes the change of optical wavelength, and extracts temperature, stress, vibration, deformation and air gap information of each monitoring point; through digital processing of sensing signals, the analysis module judges the state of blade, bolt and air gap information in real time and sends out an alarm signal according to a preset threshold value. 2, processing and outputting data; step 3, fault early warning and maintenance; according to the invention, the operation safety and efficiency of equipment can be improved.

The invention provides an extensible light-operated emission array architecture, and relates to the technical field of phased arrays. The architecture comprises a light source, an electro-optical modulator, an optical delay network, a plurality of photoelectric detectors and an array antenna. The light source can adopt a wavelength tunable laser for generating an optical signal; the electro-optical modulator is used for loading the microwave signal onto the optical signal to generate a modulation signal; the optical delay network is composed of a plurality of dispersion delay channels which can be spliced and arranged in parallel, each dispersion delay channel generates time delay through a dispersion optical fiber and has the same delay length, so that the output signal delay amount of each channel is the sum of the delay length of all channels arranged in advance and the delay length of the channel; and after passing through the photoelectric detector, all the optical delay signals are radiated to the space through the antenna array so as to be superposed in a far field to form a transmitting wave beam. The delay length can be adjusted by changing the optical wavelength, and the number of channels can be flexibly increased or decreased through the expansion interface according to needs, so that the flexible expansion of the array scale is realized.

The invention provides a crystalline silicon solar cell with high conversion efficiency and a preparation process thereof, and belongs to the technical field of solar cell preparation. The preparation process comprises the following steps: pretreating a crystal silicon wafer; preparing a bionic micro-nano composite film; preparing a composite structure on the surface of the silicon wafer; preparing the glass powder doped with the phosphorus-doped graphene; preparing a positive electrode conductive slurry; and preparing the crystalline silicon solar cell. The CuS nanocrystals / quantum dots are deposited on the surface of the bionic micro-nano composite film, the effects of antireflection, passivation and sensitization of the silicon wafer can be achieved, the photoelectric conversion efficiency of the battery is further improved, the CuS nanocrystals / quantum dots are deposited, the absorption range of the silicon wafer to the optical wavelength can be increased, and the photoelectric conversion efficiency of the battery is improved. Meanwhile, one absorbed photon can be converted into a plurality of photon-generated carriers through the CuS quantum effect, and the photoelectric conversion efficiency of the cell is improved.

The invention discloses a fiber bragg grating sensor for moisture monitoring, and relates to the field of moisture monitoring, and the fiber bragg grating sensor comprises a sensor body and a processor. The sensor body comprises a shell, a heating wire, at least one optical fiber and at least one fiber bragg grating; the heating wire and the optical fiber are inserted into the shell in parallel; the fiber bragg grating is arranged on the optical fiber; the processor is connected with the fiber bragg grating; when moisture of to-be-measured soil is measured, the sensor body is vertically inserted into a heating line in the to-be-measured soil along the direction of the heating line to heat the to-be-measured soil under a set heating condition, the fiber bragg grating measures the deviation of optical wavelength in the optical fiber in the heating process, and the processor determines temperature distribution of the to-be-measured soil according to the deviation. According to the soil moisture monitoring method and the soil moisture monitoring device, the moisture monitoring of the large-area soil can be accurately realized, and the cost is low.

A method for training a machine-learning (ML) model using photoplethysmographic (PPG) data has been developed. The method includes receiving PPG training data including series of PPG data corresponding to first and second optical wavelengths, generating time segments in the at least one PPG data set, selecting only a portion of the time segments having high-frequency noise beneath a predetermined threshold for inclusion in training data, removing a rolling average value for the from each time segment in the training data, identifying peaks and valleys in the training data, generating normalized amplitudes of the peaks and valleys in the training data, identifying waves in the normalized amplitudes, each wave being identified based on a spike in the normalized amplitudes, and generating a trained ML model to classify data relevant to a biomarker using a training process with an untrained ML model and the identified waves.

The invention provides an achromatic superlens design method and device, and the method comprises the steps: carrying out the light field simulation of a target metasurface, and obtaining a simulation light field; the target metasurface is a plane where the pattern of the super lens is located; performing iterative optimization on the target metasurface according to the simulation light field and a preset target function, and taking the metasurface corresponding to the minimum preset target function as a final design pattern of the achromatic superlens; the preset objective function is irrelevant to the light wavelength and is used for representing the deviation between the simulation light field and the ideal light field; the ideal light field is related to the polar angle of the target metasurface in space, it is ensured that the super lens can achieve the characteristic that the focal length is not changed under different wavelengths, the high-quality achromatic effect is achieved, and the design efficiency and precision of the super lens are improved.

The invention discloses a wavelength division multiplexer device and method compatible with channel monitoring, and relates to the technology of wavelength division multiplexers. According to the integrated wavelength division demultiplexer device with the wavelength division demultiplexing end adopting the waveguide deep etching Bragg grating, the functions of multi-channel network information transmission and network channel state monitoring can be realized at the same time; the wavelength division demultiplexer comprises a wavelength division demultiplexer common end input waveguide, a wavelength division demultiplexer, a wavelength division demultiplexer output waveguide and a Bragg grating which is written in the wavelength division demultiplexer output waveguide area by adopting a phase mask method. The device is high in integration degree and simple in structure. The channel monitoring method provided by the invention is realized based on the integrated wavelength division demultiplexer device, does not need to additionally distribute wavelengths for monitoring channels and independently distribute optical fibers for returning monitoring signals, is low in implementation difficulty compared with a software means for monitoring link node information, and can be applied to a complex optical communication network.

The invention discloses an intelligent control method and system for an LED plant growth lamp, and the method comprises the steps: arranging environment data according to the sequence of collection time, and obtaining an environment sequence; splitting the environment sequence to obtain a window, and arranging according to the quantity of the environment data in the window to obtain a quantity sequence; performing feature extraction on the environment sequence and the number sequence to obtain a number sequence feature and an environment sequence feature, performing feature value calculation to obtain an environment feature value, and combining the environment feature value with the plant feature vector to obtain a fusion feature vector; performing spectrum combination adjustment according to the position index of the corresponding optical wavelength in the fusion feature vector; and obtaining the growth stage of the plant according to the plant type, carrying out matching based on the plant type, the growth stage and the adjusted spectrum distribution to obtain a spectrum proportion and a light period, and generating a control instruction to control the LED plant growth lamp. The method can meet the growth requirements of different plants in different periods.

The invention belongs to the technical field of optical communication testing, and provides a multichannel synchronous optical wavelength scanning test module and a data fusion system thereof, the multichannel synchronous optical wavelength scanning test module comprises a scanning light source, a multichannel scanning optical power meter, a wavelength analysis unit, a polarization controller, a trigger synchronization unit and an integrated platform; the scanning light source is configured to provide a basic light source; the multi-channel scanning optical power meter is configured to measure optical power of a plurality of channels at the same time to obtain optical power data; the wavelength analysis unit is configured to perform wavelength analysis on the optical signal output by the basic light source so as to determine the wavelength value of the optical signal; the trigger synchronization unit is configured to realize linkage control between the scanning light source and the polarization controller to form polarization state-wavelength cooperative scanning so as to synchronously complete wavelength scanning and switching of multiple polarization states; the integrated platform is configured to perform unified control and management; according to the invention, high-precision and high-efficiency multichannel optical wavelength scanning test can be realized.

The invention provides a topological charge-wavelength adjustable vortex fiber laser based on circularly polarized light. The laser comprises a pump light source, a wavelength division multiplexer, a tunable filter, a first collimator, a first liquid crystal variable delayer, a metasurface, a second liquid crystal variable delayer and a polarization beam splitter which are arranged in sequence. The pump light source is used for emitting laser, the pump light source is connected with the wavelength division multiplexer, the wavelength division multiplexer is connected with the tunable filter, the tunable filter is used for adjusting the optical wavelength, and the first liquid crystal variable delayer and the second liquid crystal variable delayer are used for adjusting the topological charge of light. The first liquid crystal variable delayer converts linearly polarized light into circularly polarized light and outputs the circularly polarized light to the super-structure surface, the super-structure surface comprises a plurality of uniformly arranged super-unit cells, and each super-unit cell is provided with two isotropic super-structure surface units and two anisotropic super-structure surface units which are diagonally arranged.

The present disclosure relates to a vacuum interrupter (1) for an on-load tap changer (10), the vacuum interrupter (1) comprising a cylindrical housing (12) arranged on an axis (z), the housing comprising a wall (14) enclosing a hermetically sealed inner volume (16), the wall (14) further comprising a ceramic bottom portion (15) extending perpendicular to the axis (z), the wall (14) of the housing (12) comprises a first optical interface (18) between the internal volume (16) and an external environment (20) outside the housing (12), the first optical interface (18) being configured to be transparent to at least one optical wavelength, the internal volume (16) comprising a light guide (22) leading to the environment of the internal volume (16), a switch (34) arranged coaxially with the housing (12) on an axis (z) and located within the internal volume (16) of the housing (12), the vacuum interrupter (1) further comprises a shielding element (40) arranged coaxially with the switch (34), in which the light guide (22) is arranged recessed relative to the inner surface (32) of the ceramic bottom portion (15) in the wall (14) of the housing (12), and the shielding element (40) is arranged between the switch (34) and the light guide (22).

The invention provides a link power control method and system for a coherent optical wavelength division multiplexing transmission system. The method comprises the following steps: establishing a coherent optical wavelength division multiplexing transmission simulation system; configuring the transmitting power of each channel in the wavelength division multiplexing system; taking the initial state of the transmitting power as the input of an execution neural network, obtaining adjustment values of transmitting power of different channels, and calculating the transmitting power of the channels through the initial state and the adjustment values of the transmitting power; configuring attenuation of each channel of a wavelength selection switch in the wavelength division multiplexing system; and taking the initial state of the wavelength selection switch as the input of the execution neural network, obtaining the attenuation adjustment value of the wavelength selection switch, and calculating the channel transmitting power through the initial state and the attenuation adjustment value. On the basis of a deep reinforcement learning algorithm, optimal configuration of power in a link is realized by adjusting emission work of different channels in a coherent optical wavelength division multiplexing system and attenuation of different channels in a wavelength selection switch, so that the communication quality of each channel of a receiving end after transmission is optimized.

In an LD-pumped solid-state laser, where a solid-state laser crystal is excited by excitation light emitted from an LD to cause laser oscillation, and the resulting laser oscillation light of two frequencies is converted into a sum frequency, stable operation and cost reduction are achieved. [Solution] In an LD-pumped solid laser 1 comprising a solid laser crystal 19, an LD 11 that emits excitation light to excite the solid laser crystal 19, a resonator that resonates the light emitted from the solid laser crystal 19, and an optical wavelength conversion element 22 that converts the wavelength of solid laser oscillation light L21 and L22, a multiplexing means 21 is provided that receives the two solid laser oscillation light L21 and L22 from different directions and combines them into one, and the optical wavelength conversion element 22 converts the combined solid laser oscillation light L21 and L22 into a sum frequency.

The utility model relates to the technical field of lighting equipment, in particular to an optical wavelength conversion device and a light source, the optical wavelength conversion device is used for receiving laser and emitting fluorescence in a specified direction under the excitation action of the laser, and the optical wavelength conversion device comprises a substrate and a plurality of surface microstructures. The substrate has a thickness direction and comprises a first surface and a second surface, and the first surface and the second surface are located on the two sides of the substrate in the thickness direction. The plurality of surface microstructures are arranged on the first surface of the substrate, each surface microstructure is provided with a third surface, the third surface is inclined relative to the first surface, and the third surface is provided with a wavelength conversion layer, so that the third surface is used for absorbing laser to generate fluorescent light and reflecting the laser which is not absorbed; and the reflection direction of the laser which is not absorbed is consistent with a specified direction. Through the arrangement, reflected laser and excited fluorescence can be mixed together, Fresnel reflection of the laser on the surface of the device can be reduced, and meanwhile, the laser for exciting the fluorescence is increased.

The invention relates to the technical field of laser wavelength measurement, in particular to an optical wavelength measurement device based on a band-pass filter and a wavelength measurement calibration method, and the device comprises a single-mode optical fiber, and the band-pass filter and a camera which are sequentially arranged along the propagation direction of incident light; the single-mode optical fiber is used for receiving incident light with a wavelength to be measured; the band-pass filter is arranged at a certain angle relative to the direction of incident light, so that the incident light enters at a certain angle when reaching the band-pass filter, and the band-pass filter generates different spectral responses for the incident light with different wavelengths, so that the light field intensity distribution after passing through the band-pass filter generates different changes; and the camera is used for shooting and recording light field intensity distribution after passing through the band-pass filter. Operation is simple and convenient, and cost is low; the measurement speed is high and the measurement is accurate; the device is simple in structure, small in size and convenient to integrate and carry.

The invention provides a head-up display device, and relates to the technical field of near-to-eye display. The head-up display device comprises a filter which is arranged in a light path of the head-up display device and is used for filtering light rays which are not matched with the light wave band of the head-up display device. According to the head-up display device, the filter is arranged in the light path of the head-up display device, and the filter is used for filtering out the light which is not matched with the light wave band of the head-up display device, so that the interference of stray light is effectively reduced, the imaging definition is remarkably improved, a driver can obtain key driving auxiliary information more clearly, and the driver experience is improved. Therefore, the driving safety is further improved.

The embodiment of the invention relates to a method and device for optical communication, an optical filter and a computer readable storage medium. In an example method, a first apparatus sends initialization information to a second apparatus over an optical signal having a fixed optical wavelength, the initialization information including at least synchronization information for a network device associated with the second apparatus. The first device selects, for the second device, a tunable optical wavelength for optical communication of the second device. The first device also transmits tunable optical wavelength information for the tunable optical wavelength to the second device via an optical signal having a fixed optical wavelength. In this manner, distribution of common local oscillator synchronization information can be supported, and enhanced filtering performance is achieved.

An apparatus having input and output ports using a plurality of optical connector adapters, wherein the fiber connections can follow a specific mesh pattern has a plurality of fibers inside the apparatus. The fibers pass through at least one mandrel and are designed to produce a leakage in the transmitted light from each fiber of least −30 dBm, wherein the fiber buffer of fibers around the mandrel are partially stripped in at least one section. The apparatus also has an imaging system consisting of at least a lens, camera sensor and an optical filter are placed in proximity to the fiber striped section wherein the optical filter has spectral properties tuned or partially tuned to the operational wavelength of the network and the optical filter is placed in the light path before the camera sensor.

A laser communications terminal (LCT) includes separate optical head assemblies (OHAs) for optical signal transmission and reception, with respective pointing systems allowing separate pointing control of the respective OHAs. In a satellite communications system (SCS) having an optical ground station (OGS) configured for communicatively coupling with a satellite of the SCS via an optical feeder link (OFL), the satellite and / or the OGS implements a respective dual OHA (DOHA). In one or more embodiments, the DOHA is configured for the use of different optical wavelengths with respect to optical communications beams on the uplink and downlink. Among several advantages flowing from use of the DOHA is isolation of the optical paths carrying the outgoing optical beam(s) and the incoming optical beam(s), along with the ability to optimize and simplify the corresponding optics. Further, providing separate pointing control relieves the need for manufacturing the DOHA with precise inter-head alignment.

The invention provides a gallium oxide solar blind photoelectric detector and a preparation method and a spectrum detection method thereof, which can be applied to the technical field of ultraviolet detection. The gallium oxide solar blind photoelectric detector comprises a gallium oxide single crystal substrate; the back electrode is arranged at the bottom of the gallium oxide single crystal substrate; the aluminum gallium oxide thin film is arranged at the upper part of the gallium oxide single crystal substrate, the aluminum gallium oxide thin film comprises a plurality of photosensitive layers with different contents of aluminum components, the forbidden bandwidths of the plurality of photosensitive layers are different, and the photosensitive layers are used for absorbing and detecting optical wavelengths corresponding to the forbidden bandwidths; and the electrode is arranged at the upper part of the aluminum gallium oxide film.

A temperature strain separable dynamic and static combined measurement distributed optical fiber sensing system, comprising: laser, optical modulator, radio frequency signal generator, optical filter, DFB laser, polarization controller, first acoustooptic modulator, depolarizer, erbium-doped fiber amplifier, two optical circulators, optical wavelength division multiplexer, receiving module, signal acquisition and processing module are arranged in sequence, the application carries out temperature sensing to the back Raman scattering light of the pulse while receiving the Rayleigh scattering light of the detection pulse, and controls the time interval of adjacent pump pulse and detection pulse to carry out three-bit pulse coding and decoding, so that the back Raman scattering signals of individual pulse in pulse pair are separated in time, and finally the simultaneous measurement of dynamic variable (vibration) and static variable (temperature, static strain) is realized and the spatial resolution of measurement is ensured not to be lost.

The utility model relates to the technical field of fiber bragg grating demodulation, in particular to a multichannel high-speed fiber bragg grating demodulation device, which comprises an optical path module and an electric signal module, the optical path module comprises a tunable laser unit, a PLC (programmable logic controller) unit and a plurality of FBG (fiber bragg grating) sensors, the PLC unit comprises an optical splitter and a plurality of couplers, the electric signal module comprises a main control unit, a photoelectric conversion unit, a DC / DC unit, a 485 communication unit and an Ethernet communication unit, optical signals emitted by the tunable laser unit pass through an optical splitter and a multi-path coupler and then enter an FBG sensor, light is reflected by a grating and then is connected to a photodiode through the coupler, and the photoelectric conversion unit is connected to the Ethernet communication unit. And after photoelectric conversion, AD conversion and peak searching algorithm processing, the optical wavelength is demodulated. According to the utility model, a chip-level data acquisition design is adopted, the scanning speed of the demodulator is improved, fusion with a field system is facilitated through the 485 communication unit, and a heterogeneous system of the master control unit and the FPGA unit is adopted, so that the edge computing capability is enhanced.

The application discloses a frequency synchronization method of coherent clock system in high-speed data transmission, and a frequency synchronization method and equipment structure for providing high-precision time-frequency reference transmission and 10Gbps data stream transmission. A high-speed modulator is used to generate a radio frequency signal at a local end and a remote end, and the radio frequency signal is received from the opposite end. A carrier tracking technology is used to recover the radio frequency carrier, and a frequency discrimination and phase discrimination value is obtained through a signal processing algorithm in a digital domain. The local frequency discrimination and phase discrimination value is sent to the remote end, the remote end uses the local value and the opposite value to realize joint phase discrimination, and then the joint phase discrimination is sent to a loop filter. The loop filter outputs a voltage control signal, and the remote end uses the voltage control signal to control a voltage-controlled crystal oscillator, so that the frequency synchronization between the remote end and the local end is realized. The method can realize single-fiber single-wavelength bidirectional time-frequency synchronization and high-speed data transmission, can fully utilize the optical wavelength resources of the optical fiber transmission system, and can save the optical wavelength resources compared with the traditional method, and has higher frequency synchronization precision.