678 results about "Optical transmitter" patented technology

A LiDAR apparatus, including: a laser to generate an optical signal; modulation components configured to receive the optical signal as an input and to output at least two corresponding modulated optical signals at respective output ports, wherein each modulated optical signal is modulated by a corresponding pseudo-random bit sequence, and: (i) the optical signals have respective different delays such that the modulations do not overlap in time; or (ii) the pseudo-random bit sequences have low cross-correlation; for each of the at least two modulated optical signals, a corresponding optical transmitter configured to transmit the corresponding modulated optical signal towards a corresponding surface spaced from the LiDAR apparatus by a corresponding distance, and a corresponding optical receiver configured to receive a portion of the transmitted optical signal scattered and / or reflected by the surface, the received portion of the optical signal having a phase shift and / or Doppler shifted angular frequency due to radial motion of the LiDAR apparatus relative to the surface; at least one photodetector to receive the optical signals received by the optical receivers, interfered with a reference beam, and to generate a corresponding output signal; at least one analogue to digital converter to generate a digital signal representing the output signal from the at least one photodetector; and a digital signal processing component configured to process the digital signal to generate LiDAR data representing the distances to the surfaces and / or relative velocities of the surface(s) with respect to the apparatus.

In an optical wireless communication system equipped with a pair of optical wireless communication devices (1), the optical wireless communication device (1) is equipped with a plurality of optical transmitting units (101) that transmit optical signals of a target wavelength, an optical multiplexing / demultiplexing unit (103) that multiplexes the optical signals transmitted by the optical transmitting units (101) and transmits the multiplexed optical signals to the counterpart optical wireless communication device (1) and demultiplexes the optical signals from the counterpart optical wireless communication device (1) into optical signals of a plurality of wavelengths, and a plurality of optical receiving units (102) that receive optical signals of a target wavelength from the optical signals demultiplexed by the optical multiplexing / demultiplexing unit (103), and the wavelengths that are the target of the optical transmitting units (101) and the optical receiving units (102) are wavelengths that are alternately assigned in order of length, and between the pair of optical wireless communication devices (1), the wavelengths that are the target of the optical transmitting units (101) and the optical receiving units (102) are shifted by one.

Data are optically transmitted from a power tool device, such as a power tool, a power tool battery charger, power tool pack adapter, and / or a battery pack. The data are stored in a memory of the power tool device and are encoded as optical signal data to provide an encoded representation of the stored data. An optical transmitter (e.g., a light emitting diode or a flat panel display) transmits the optical signal data, which are detected or otherwise received by an optical receiver device, which may include a camera or other photodetector. The optical signal data may include light signals generated by an LED, where the data are encoded using an encoding scheme that modulates one or more characteristics (e.g., amplitude, wavelength, color) of the generated light signals. The optical signal data may also include images (e.g., barcodes, QR codes) or characters.

The invention relates to the technical field of optical wireless communication, in particular to an optical wireless communication device and method based on beam shaping, and the device comprises a beam shaping module which comprises at least one beam shaping lens so as to convert a beam outputted by a point light source into a uniformly distributed linear or planar light field; the optical transceiver module comprises a plurality of optical base stations, the optical base stations are arranged in a redundant mode in the extension direction of the communication scene, each optical base station integrates at least one optical transmitter, an optical detector and a plurality of prisms and is used for transmitting and receiving optical signals, and the coverage range of the single optical base station is expanded through the prisms; and the dynamic demodulation module is connected with the optical detector, and dynamically adjusts the demodulation threshold value of the corresponding bit error rate according to the real-time channel state. Therefore, when the technology is applied to wireless optical communication, the communication performance can be improved, the coverage distance can be increased, the coverage uniformity can be improved, the bit error rate can be reduced, the construction cost can be reduced, and the long-term stable communication requirement of a closed scene can be met.

The invention provides an electro-optical modulator and an optical transmitter, the electro-optical modulator comprises a first branch waveguide, a second branch waveguide and a radio frequency electrode, the radio frequency electrode comprises a first ground electrode, a first signal electrode, a second ground electrode, a second signal electrode and a third ground electrode which are sequentially arranged at intervals, the first signal electrode and the second signal electrode are configured to receive a driving signal, the first branch waveguide and the second branch waveguide are respectively located in a spacing area between any two adjacent electrodes in the radio frequency electrodes, and the directions of electric fields at the positions of the first branch waveguide and the second branch waveguide are opposite.

Provided is an optical transmitter having high manufacturing stability and a high reflection suppression effect. In the optical transmitter, a distributed feedback (DFB) laser having an active region formed as a multiple quantum well that generates an optical gain by current injection and a diffraction grating, an electro-absorption (EA) modulator having an absorption region formed as a multiple quantum well having a composition different from a composition of the DFB laser, a semiconductor amplifier (SOA) having an active region having a same composition as the composition of the DFB laser, a bent waveguide that rotates a light propagation direction by an angle θwg, and a passive waveguide connected to the SOA and including a core having a band gap wavelength shorter than an oscillation wavelength of the DFB laser are monolithically integrated on one substrate. The passive waveguide has a tapered region and a narrow waveguide region. The tapered region converts a width W1 of the passive waveguide connected to the SOA into a width W2 of the narrow waveguide region, and the passive waveguide forms the angle θwg with respect to a normal line to an end surface of the substrate and is in contact with the end surface of the substrate.

The invention relates to the technical field of power grid communication transmission, and discloses an optical transceiver stability enhancing method and system, and the method comprises the following steps: S1, dividing an optical transceiver system into a plurality of functional regions, configuring at least one optical transceiver node in each region, and connecting the optical transceiver nodes of adjacent regions through redundant links; and S2, according to the real-time load, the bandwidth and the delay parameter of the optical transmitter and receiver, a redundancy switching algorithm is adopted to optimize the redundancy path, and the system further comprises the following modules: a region redundancy module used for dividing the optical transmitter and receiver system into a plurality of regions and connecting the optical transmitter and receiver nodes of the adjacent regions through redundancy links. Through dynamic redundant path switching, advanced electromagnetic shielding and EMI filtering design and an efficient temperature control system, the problems of inflexible redundant path, insufficient electromagnetic interference protection and untimely temperature control response in the existing optical transceiver technology are solved, so that the stability and the anti-interference capability of the system are remarkably improved, and the service life of equipment is remarkably prolonged.

Embodiments described herein may be related to apparatuses, processes, and techniques related to a dual polarization chiplet that may be used by an optical receiver to split multi-polarized light traveling on a single fiber and carrying two or more light signals into two or more fibers each carrying the particular light signal. The dual polarization chiplet may also be used by an optical transmitter to combine multiple light signals to be transmitted onto a single fiber, where each of the multiple light signals are represented by a different polarization of a wavelength on the single fiber. Other embodiments may be described and / or claimed.

The invention belongs to the field of optical transmitter and receiver fault detection, and particularly relates to an optical transmitter and receiver fault detection method, which comprises the following steps: acquiring optical transmitter and receiver data in real time, and preprocessing the optical transmitter and receiver data; inputting the preprocessed data into an LSTM (Long Short Term Memory) model into which an attention mechanism is introduced to obtain dynamic features and static features; fusing the dynamic features and the static features, and inputting the fused features into a Bayesian network to obtain a fault detection result; according to the method, the data enhancement technology is realized, and the training effect is improved by adopting the LSTM model in which the attention mechanism is introduced, the mixed time sequence feature and causal feature model and the Bayesian network.

An optical circuit is used with continuous wave signals having different wavelengths at a channel spacing from one another. A portion of the optical circuit is implemented in a photonic integrated circuit. Modulators in a modulation stage modulate the continuous wave signals to produce modulated signals. A multiplexing stage, which can have multiplexing filters, power combiners, or power couplers, multiplexes the continuous wave or modulated signals to produce multiplexed signals. The multiplexing stage may be placed either before or after the modulation stage. One or more polarization rotator and combiner (PRC) devices in a final stage combines the multiplexed signals into an output signal. The output signal has a first set of the different wavelengths at a first polarization and has a second separate set of the different wavelengths at a second polarization orthogonal to the first polarization.

The invention belongs to the technical field of optical communication chips, and particularly relates to an HEMT (High Electron Mobility Transistor)-driven near ultraviolet bidirectional optical communication monolithic integrated chip with the wavelength of 365 nm and a preparation method thereof. Functions of an optical transmitter, an optical receiver and a driver are integrated into one chip, light emitted by a transmitting end is coupled into an optical waveguide and is detected by a photoelectric detector, an optical signal is converted into an electric signal, information transmission in the chip is completed, and a bidirectional optical communication link can be constructed without two sets of optical transmitters and optical receivers; the DBR Bragg reflection layer is adopted to reflect emergent light in all directions back to the waveguide of the straight waveguide area, so that the emergent light is transmitted to a receiving end along the waveguide of the straight waveguide area, by designing the material and period of the DBR, about 70% of the emergent light can be reflected, and the detection accuracy is improved; the integrated HEMT drive reduces the size and complexity of the whole circuit, the HEMT can still keep good linear performance under high current, distortion is reduced, and the stability of LED light output is ensured.

In an EADFB laser with an integrated SOA, a new configuration in which deterioration of optical waveform quality is solved or mitigated while taking advantage of characteristics that the same layer structure can be used and the manufacturing process can be simplified is shown. In an optical transmitter of the present disclosure, a carrier density is optimized depending on a light intensity inside the SOA and an amount of carrier consumption. The SOA is electrically separated into a plurality of regions, and a current is injected into each region independently. The divided SOA region is configured so that a length of the SOA region becomes shorter as a region is farther from an incidence end of the SOA. Further, for the divided SOA, an amount of carrier consumption increases as the SOA region is farther from the incidence end, so that a current injection amount is increased.

The embodiment of the invention provides an optical communication assembly which is applied to the optical communication field and the optical fiber communication field. The optical communication assembly comprises an optical transmitter and a first tail fiber. The light emitter is connected with the first tail fiber. The first tail fiber and the first optical fiber are connected through a first optical port connector. The first tail fiber is a plastic optical fiber. The first optical fiber is a glass optical fiber. The optical transmitter is used for generating a first optical signal and transmitting the first optical signal to the other optical communication assembly through the first tail fiber and the first optical fiber. In the technical scheme provided by the invention, the plastic optical fiber and the glass optical fiber are combined for use, so that the noise can be reduced, and low-cost and high-quality optical communication is realized.

An optical transmitter includes a distributed feedback (DFB) laser having an active region formed as a multiple quantum well (MQW) and a diffraction grating, an electro-absorption (EA) modulator having an absorption region formed as a MQW having a composition different from a composition of the DFB laser, a semiconductor amplifier (SOA) having an active region having a same composition as the composition of the DFB laser, a bent waveguide that rotates a light propagation direction, and a passive waveguide connected to the SOA and including a core having a band gap wavelength shorter than an oscillation wavelength of the DFB laser. A tapered region of the passive waveguide converts a width W1 of the passive waveguide connected to the SOA into a width W2 of a narrow waveguide region of the passive waveguide, and the passive waveguide is in contact with the end surface of the substrate.

The invention discloses an inter-satellite laser communication link simulation device based on energy feature inversion. Belongs to the technical field of satellite laser communication, particularly relates to the technical field of inter-satellite laser communication link simulation devices based on energy feature inversion, and provides an inter-satellite laser communication link simulation device based on energy feature inversion. And an equivalent energy environment is constructed in the system, and accurate testing of the communication capability of the terminal machine is realized. The device comprises a transmitting optical transceiver, a receiving optical transceiver, a communication attenuation simulation module and a computer, the transmitting optical transmitter and receiver transmits a communication light beam along the communication attenuation light path A or the communication attenuation light path B, and the communication light beam is transmitted into the receiving optical transmitter and receiver after being subjected to dynamic simulation communication attenuation by the communication attenuation simulation module; the computer is used for controlling the communication attenuation simulation module to dynamically simulate communication attenuation.

The invention relates to the field of power electronic devices, in particular to an all-fiber isolation SiC MOSFET grid driver suitable for ultrahigh voltage and application, the all-fiber isolation SiC MOSFET grid driver comprises a transmitting side, a fiber group and a receiving side which are connected in sequence, the transmitting side comprises a constant-current laser driver, a semiconductor fiber coupling laser, a fiber coupler of an FC connector, a high-speed light emitter driver and a light emitter, and the receiving side comprises a high-speed light emitter driver and a high-speed light emitter. The optical fiber group comprises a quartz power optical fiber and a plastic signal optical fiber of an FC (Fiber Channel) joint, and the receiving side comprises a beam expander, a laser battery, a 5V boost IC (Integrated Circuit), a 25V boost IC, an optical receiver, a non-isolated driving IC and a push-pull current expanding circuit. And common-mode interference caused by a coupling capacitor is eliminated. Meanwhile, the efficiency of a device is reasonably calculated, and a high-efficiency boost IC is matched, so that the driving power of 0.8 W is realized, and a 6.5 kV 25A high-voltage SiC MOSFET module can be driven to work at the switching frequency of more than 100kHz.

A practice aid system includes: a practice aid device; a hoop sensor system, including first and second pairs of an optical transmitter and receiver, which are mountable on a rim of a basketball hoop; an intelligent ball, including an inflatable ball body, a ball control unit, a ball light source, and a ball motion and location sensor; an intelligent shoe, including a shoe body, a shoe control unit, a shoe motion and location sensor, a vibrator, and a shoe light source.

An electro-optical integrated circuit comprising an optical transmitter and an optical receiver is disclosed in which a monolithically integrated electro-absorption modulated laser (EML) can operate bi-directionally in both transmitter and receiver modes. Vertically stacked waveguides for lasers and electro-absorption modulators (EAMs) are provided. The laser and the EAM are optically coupled through a transverse conical vertical optical coupler. The EML includes monolithically integrated electronic circuitry, such as drivers and control electronics for driving the laser as the EML and the EAM in the transmitter mode. The control circuit includes a transimpedance amplifier (TIA). The EAM has a first portion and a second portion that may be independently biased. In receiver mode, the laser current is reduced near a threshold, a first portion of the EAM is biased to absorb residual laser light, while a second portion of the EAM provides photocurrent to the TIA as a photodiode receiver.

The invention relates to an Optical Front-end, OFE, (400) for Optical Wireless Communication, OWC, the OFE comprising: an optical receiver with at least a photodetector (102a) and a trans-impedance amplifier, and a two-dimensional array of optical transmitters (103a) each having an individual transmitter field-of-view, and one or more drivers, the two-dimensional array arranged to create a combined transmitter field of view that is larger than 5 the individual transmitter field of view, the plurality of optical transmitters arranged such that optical axes of the plurality of optical transmitters are evenly distributed within the combined transmitter field of view.

The invention relates to the technical field of communication monitoring, and discloses an optical transmitter and receiver transmission monitoring method, which comprises the following steps: S1, data acquisition and preprocessing: acquiring various operation data of an optical transmitter and receiver in real time, including temperature, voltage, current and signal intensity, and preprocessing the acquired data, including data cleaning, noise filtering and normalization; s2, nonlinear dynamic modeling and fault prediction, the invention also provides an optical transceiver transmission monitoring system, and the system comprises a data collection module which is used for collecting the parameters of temperature, voltage, current and signal intensity of the optical transceiver in real time; and the nonlinear dynamics analysis module is used for carrying out system modeling based on a nonlinear dynamics theory and calculating a Lyapunov index. By introducing the LQG control algorithm, the redundancy coding technology and the remote monitoring platform, optimization in the aspects of dynamic threshold adjustment, fault prediction and data transmission security is realized, and the intelligence, reliability and security of the system are improved.

The present invention relates to the field of communication and sensing, and specifically to a communication and sensing integrated device based on a seven-core optical fiber interferometer and an application method therefor. The application method comprises: a first beam splitter splitting, into reference light and signal light, a light source emitted by a narrow linewidth laser; performing modulation by means of a first coherent optical transmitter and a second coherent optical transmitter; amplifying the light by means of a first amplifier and a second amplifier, and then enabling the light to pass through a multi-core optical fiber from a fan-in end, and to output from a fan-out end; performing beam splitting by means of a second beam splitter and a third beam splitter, and performing demodulation by means of a first coherent receiver and a second coherent receiver; and finally, a phase-locked loop performing interference elimination on preliminarily-demodulated reference light and preliminarily-demodulated signal light to obtain finally-demodulated reference light and finally-demodulated signal light. The present invention uses a phase-locked loop to further eliminate disturbance noise of reference light and signal light. Therefore, noise interference is eliminated in continuous low-frequency detection, thereby improving the communication and sensing effect.

The invention relates to an optical transmitter and receiver equipment fault prediction method based on deep learning. The method comprises the steps of receiving and preprocessing historical operation performance index data and historical environment state monitoring data of an optical transmitter and receiver; obtaining a to-be-tested operation performance index data sequence and a to-be-tested environment state monitoring data sequence from the historical operation performance index data and the historical environment state monitoring data of the optical transceiver through a time sliding window with a self-adaptive size; respectively inputting a to-be-detected operation performance index data sequence into the LSTM model and the first TCN model for feature extraction to obtain a global feature sequence and a local feature sequence, inputting a to-be-detected environment state monitoring data sequence into the second TCN model for feature extraction to obtain an external factor feature sequence, and obtaining a to-be-detected environment state monitoring data sequence; and carrying out weighted fusion on the global feature sequence, the local feature sequence and the external factor feature sequence by using a preset weighting factor to obtain a fused feature sequence, inputting the fused feature sequence into a Transformer encoder based on feature dimension attention and time dimension attention, and outputting a prediction result, so that the accuracy of the prediction result can be remarkably improved.

An optical transmission apparatus includes an optical transmitter that generates an optical signal in an uplink direction by modulating output light of a laser that outputs light of a first frequency with a subcarrier on which transmission data is superimposed, a heterodyne detection unit that receives an optical signal in a downlink direction by heterodyne detection, a control unit that calculates a first intermediate frequency based on the frequency of the downlink signal received by the heterodyne detection and the first frequency of the laser, and controls the first frequency of the laser when there is a difference between the calculated first intermediate frequency and a reference second intermediate frequency by a threshold or more.

The embodiment of the invention relates to the technical field of printing equipment, and particularly discloses an anti-collision method for a nozzle of printing equipment, a detection device and the printing equipment, and the method comprises the steps: firstly controlling a light emitting mechanism to emit detection surface light, and obtaining an emitted light intensity value of the detection surface light emitted by the light emitting mechanism; and after the light receiving mechanism receives the detection surface light, the receiving light intensity value of the detection surface light received by the light receiving mechanism is detected, whether an abnormal obstacle exists in a preset moving area of the spray head or not is determined according to the emitting light intensity value and the receiving light intensity value, and finally, if the abnormal obstacle exists, a preset spray head anti-collision strategy is executed. According to the embodiment of the invention, through comparative analysis of the light intensity of the detection surface light before and after passing through the preset moving area of the nozzle, non-contact detection of abnormal obstacles on the moving path of the nozzle is realized, and the sensitivity and reliability of anti-collision detection of the nozzle are improved.

The invention relates to an optical signal transmission device. The optical signal transmission device comprises an optical transmitter and an optical receiver. The optical transmitter and the optical receiver are connected through an optical fiber, the optical transmitter comprises a laser and a silicon optical chip, and the laser is used for outputting multiple paths of optical signals to be transmitted to the silicon optical chip; the silicon optical chip is used for carrying out modulation and wave combination processing on multiple paths of optical signals to be transmitted and transmitting the processed optical signals to the optical receiver through an optical fiber; and the optical receiver is used for performing photoelectric conversion on the processed optical signal to generate an electric signal corresponding to the optical signal to be transmitted. According to the invention, the silicon optical chip is directly adopted to realize modulation and wave combination processing at the same time instead of adopting semiconductor chips such as a laser chip for modulation and then adopting an independently arranged wave combiner for wave combination, so that the optical transceiver module can be arranged more ingeniously, the integrity of optical signal transmission can be ensured, and the optical signal transmission efficiency is improved. And the optical signal transmission performance can be improved.

The utility model discloses a laser degumming device, which relates to the technical field of laser degumming, and comprises an external refrigeration mechanism and a degumming mechanism, the external refrigeration mechanism is used for pre-refrigerating a magnet with glue, the degumming mechanism comprises a three-axis linear displacement mechanism and a laser emission mechanism, the three-axis linear displacement mechanism is provided with a moving end, and the laser emission mechanism is provided with a laser emission end. The moving end is provided with a glue removing platform, the glue removing platform is used for placing a pre-refrigerated magnet with glue, the glue removing platform is further provided with an internal refrigeration mechanism, the internal refrigeration mechanism is used for refrigerating the pre-refrigerated magnet with glue on the glue removing platform again, and the laser emitting mechanism is fixedly arranged. And the laser degumming mechanism is used for emitting laser when the internal refrigeration mechanism refrigerates the glued magnet and degumming the glued magnet. According to the utility model, the adhesive magnet is refrigerated through the external refrigeration mechanism and the internal refrigeration mechanism, so that the adhesive magnet is kept in a low-temperature state before and during the adhesive removal process, and the weakness of the surface magnetism of the magnet caused by high laser temperature is eliminated through the low temperature of the adhesive magnet.

An electronic fitness device comprises a housing, a first optical transmitter, a second optical transmitter, an optical receiver, and a processor. The housing is positioned partly in contact with a user's skin. The first optical transmitter emits a first optical signal. The second optical transmitter emits a second optical signal. The optical receiver receives the optical signals and generates a first photoplethysmogram (PPG) signal resulting from the received first optical signal and a second PPG signal resulting from the received second optical signal. The processor receives the PPG signals, determines a pressure metric value based on a characteristic of a waveform of the first PPG signal and a characteristic of a waveform of the second PPG signal, and determines a pressure compensation factor based on the determined pressure metric value, the first wavelength corresponding to the first optical signal and the second wavelength corresponding to the second optical signal.

A network controller included in an optical transmission system in which an optical transmitter and an optical receiver communicate with each other via an optical transmission path, the network controller including a simulator that constructs simulation models by virtually reproducing a state of an optical transmission path in an optical transmission system including the optical transmitter, the optical receiver, and the optical transmission path in different virtual spaces, and estimates a characteristic of a device provided in the optical transmission path in each of simulation models, and an ideal output estimator that estimates an output of a characteristic of an ideal device based on a characteristic of the device estimated by the simulator and a characteristic of a device provided in the optical transmission path obtained in a real space, in which a state of an optical transmission path is different for each of the simulation models.

An electronic device may include a proximity sensor for detecting whether an external object is in the vicinity of the device. The proximity sensor may have a light detector and a light source that can be reused for data communications. The light detector may be coupled to optical receiver circuitry, whereas the light source may be coupled to optical transmitter circuitry. The optical transmitter circuitry may include encoding circuits configured to convert electrical signals to optical signals. The optical receiver circuitry may include decoding circuits configured to convert optical signals to electrical signals. The optical signals can be encoded and decoded using pulse width modulation schemes or amplitude modulation schemes.

According to an aspect of the present invention, there is provided an optical receiver in an optical transmission system that transmits an optical signal between an optical transmitter and an optical receiver connected via an optical fiber transmission path, the optical receiver including: a channel distribution estimation unit that estimates channel distribution information in a transmission direction based on the optical signal transmitted from the optical transmitter and a reference signal; and a non-linear compensation unit that performs non-linear compensation based on the channel distribution information estimated by the channel distribution estimation unit.