189 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 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 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.

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 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).

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 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 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.

Optical transceiver architecture utilizing micro-ring modulators and micro-ring resonators configured to route resonant wavelengths of light injected into each micro-ring resonator's input port and through port to that micro-ring resonator's drop port and add port, respectively. The micro-ring resonators drop two distinct streams of data modulated onto the same optical wavelength, or two wavelengths separated by an integer number of free spectral ranges coupled into the micro-ring resonators in two different directions.

A flexible optical fiber ribbon and a bonding effect testing system and method thereof. The flexible optical fiber ribbon comprises multiple optical fibers arranged side by side, and intermittent bonding portions are arranged between adjacent optical fibers; the transmittance of the intermittent bonding portions to the testing optical wavelength band is 50% or below; an optical fiber coating layer is wrapped by a colored layer, and the colored layer is wrapped by a light transmissive layer; the transmittance of the colored layer to the testing optical wavelength band is 30% or below, and the transmittance of the light transmissive layer to the testing optical wavelength band is 85% or above; and the bonding portions having standard conforming bonding effect cover the light transmissive layer in the direction of the testing light. In the present invention, a photosensitive component is used in conjunction to implement continuity testing by utilizing an optical signal, and thus the sensitivity, accuracy, and speed far exceed imaging testing. In the present invention, an optical signal continuity test is used to avoid defects such as image smearing and image retention caused by traditional imaging testing, significantly increasing testing efficiency, removing the manufacturing speed bottleneck caused by quality monitoring in a production line, and enhancing the manufacturing efficiency.

Some examples described herein provide for controlling an output modulation magnitude of an optoelectronic device. In an example, a method includes transmitting a data pattern to an optical modulator device. The method further includes, for each of a plurality of heater control values of a heater thermally coupled with the optical modulator device, identifying an optical modulation magnitude corresponding to the heater control value based on a corresponding photodiode current value identified in the transmission data mode. The method further includes determining a maximum optical modulation amplitude of the optical modulator device based on the plurality of optical modulation amplitudes corresponding to the plurality of heater control values in accordance with the identification. The method further includes controlling the heater based at least in part on the determined maximum optical modulation magnitude that has been modified according to the scaled maximum photodiode current value.

The invention provides a multi-band optical transmission system channel waveform modeling method and system based on attention gating LSTM. The method comprises the following steps: constructing a multi-band coherent optical wavelength division multiplexing transmission simulation system; generating an input / output signal pair based on a simulation system to construct an original data set; performing signal channel decoupling and preprocessing to obtain a single-channel data set; constructing a time sequence sample by using a sliding window; constructing an attention gating LSTM model and training the attention gating LSTM model; and calling the trained model to perform channel modeling reasoning. According to the invention, the problems of complex channel coupling in multiband optical transmission and low modeling efficiency of a traditional model are solved.

It is an object of the present disclosure to appropriately perform quantum key distribution through an optical wavelength division multiplexing link. There is provided a communication apparatus that communicates an optical signal based on an electrical signal obtained by multiplexing a first control signal addressed to a second optical communication apparatus from a first optical communication apparatus and a control signal for reception signal processing from a first quantum key distribution apparatus to a second quantum key distribution apparatus.

The invention discloses single-fiber wavelength division optical transmission equipment and a system thereof. The equipment comprises a case, a service processing module, a wave combining and dividing module, a network management module, a power supply module and a heat dissipation module, the service processing module comprises at least one optical wavelength conversion unit, and the optical wavelength conversion unit is used for converting an accessed non-standard wavelength signal into a plurality of paths of standard wavelength signals; the wave combining and separating module comprises a wave combining unit and a wave separating unit, the wave combining unit is used for combining multiple paths of standard wavelength signals into one path of composite optical signal, and the wave separating unit is used for separating the composite optical signal into multiple paths of single wavelength signals; the network management module is used for monitoring the working state of each module in real time; the power supply module supports alternating current or direct current input and outputs stable voltage; the heat dissipation module is provided with a speed-adjustable heat dissipation fan. According to the scheme, optical fiber resources can be efficiently integrated, multiple services can be flexibly adapted, and the deployment and upgrading cost is low.

The present invention relates to the field of optical fiber communication technologies, and in particular to a method, system and device for detecting inter-modal crosstalk of a weakly-coupled few-mode multi-core optical fiber. The method includes: S1: obtaining optical fiber parameters and injection power, where the optical fiber parameters include core refractive index, cladding refractive index, core radius, core propagation constant and optical wavelength; S2: calculating the electric field strength in the core region of the optical fiber and the electric field strength in the cladding region of the optical fiber based on the optical fiber parameters; S3: calculating the inter-modal coupling mode coefficient based on the electric field strength in the core region, the electric field strength in the cladding region and the injection power; S4: constructing an inter-modal crosstalk calculation equation according to the inter-modal coupling mode coefficient to obtain the inter-modal crosstalk value of the optical fiber. The present invention takes into account the inter-modal coupling mode coefficients under different LP modes, improves the calculation accuracy of inter-modal crosstalk, is more in line with the actual optical fiber laying situation, and has a wide application range.

The present invention provides an automatic test method and system for gain chip parameters based on LM-TL, which relates to the technical field of chip testing. The method includes: connecting a sample gain chip to a Littman-Metcalf type tunable laser, setting test parameters, and making preparations before testing; sequentially performing optical power testing, optical wavelength testing, and amplified spontaneous emission spectrum testing on the sample gain chip to obtain optical power parameter data, optical wavelength parameter data, and amplified spontaneous emission spectrum data; analyzing the optical power parameter data, optical wavelength parameter data, and amplified spontaneous emission spectrum data to determine whether the sample gain chip is qualified, and obtaining gain chip parameters and test results; by using a wide-range free-space optical external cavity swept-frequency laser source as a test device, the present invention automatically tests and analyzes the characteristic parameters of half-butterfly packaged gain chips with different batches, different waveguide beam emission angles, and different lasing center wavelengths.

This invention discloses a steady-state tunable dual-wavelength generation method based on laser phase-locked loop (PLL), belonging to the field of microwave photonics technology. It includes carrier-suppressed optical double-sideband modulation, a laser PLL, and optical wavelength control. Carrier-suppressed optical double-sideband modulation: the reference signal generated by the reference laser directly drives the modulator, which operates at the carrier suppression point, modulating the RF source onto the two sidebands of the reference signal, providing two reference wavelengths for dual-wavelength generation. Costa laser PLL: based on Costa PLL technology, frequency capture and phase locking of the signal light to the reference light are achieved. Optical wavelength control: digital frequency discrimination is used to track the frequency and phase difference between the signal light and the reference light, controlling the signal light wavelength to remain consistent with the reference light wavelength. This invention solves the frequency drift problem caused by using two independent light sources, and by combining optical frequency doubling, achieves steady-state tunable dual-wavelength generation, thereby supporting the generation of high-quality millimeter-wave signals.

The invention relates to an integrated photonic device (100) configured for near-perfect second harmonic generation (SHG) at a resonant optical wavelength λ. The device includes a substrate (S), a first (101) and second (109) distributed Bragg reflector (DBR) made of alternating layers with different refractive indices (103, 105), and a monolayer of MoS2 (ML MoS2) as the nonlinear material sandwiched between identical insulating layers (102). The device utilizes a Fabry-Perot cavity configuration, enhancing the electric field at λ, ensuring maximum SHG efficiency. The phase matching condition is satisfied due to the sub-nm thickness of MoS2 layer of 0.62 nm. The device is an SHG device with an input at 1550 nm and an output at 775 nm, with SHG conversion efficiencies higher than 99%. Ultra high nonlinear susceptibility of MoS2 also optimizes SHG performance, and the device is therefore very efficient for photonic applications.

An optical wavelength multiplexing transmission device includes: a demultiplexer configured to demultiplex a wavelength multiplexing signal for each wavelength band from a multiplexed signal that includes wavelength multiplexing signals in a plurality of the wavelength bands; a processor configured to detect an optical power value of each wavelength multiplexing signal for each wavelength band; calculate a compensation amount used to compensate a tilt of the wavelength multiplexing signal, by using the optical power value and a predetermined calculation expression; and compensate the tilt of the wavelength multiplexing signal, based on the compensation amount; and a multiplexer configured to multiplex each wavelength multiplexing signal compensated by the processor and output the wavelength multiplexing signal to a transmission line.

This invention provides a vertical-cavity surface-emitting laser (VCSEL) for high-speed communication and its fabrication method. The VCSEL comprises an epitaxial wafer, an oxide layer, an electrically insulating region, a dielectric layer, and P and N metal layers. The VCSEL structure satisfies the following: 1. The epitaxial wafer includes a resonant cavity with a total thickness of 1 / 2 optical wavelength. The oxide layer is formed on the active region of the resonant cavity. 2. The electrically insulating region is formed by ion implantation and extends from top to bottom below the active region of the resonant cavity. 3. The relief structure described in the above embodiment is set near the output aperture. The combination of these three structural characteristics enables a single-mode VCSEL for high-speed modulation. By etching the relief structure on the surface of the output aperture, the dielectric and non-dielectric regions spaced apart provide different overall reflectivities, enabling filtering of higher-order modes, thereby forming a single-mode output.