627 results about "Optical receivers" patented technology

The invention relates to a light receiving end, which is characterized in that an array lens for coupling emergent light of each channel of a 45-degree optical fiber array into a corresponding channel of an array detector chip is arranged between a 45-degree total reflection surface of a V-shaped groove in the 45-degree optical fiber array and the array detector chip, and the side surface of the array lens is fixed with the side surface of a cover plate in the 45-degree optical fiber array in a bonding manner. The invention discloses an optical receiving end coupling method. The method comprises the following steps of: aligning each channel of a 45-degree optical fiber array with each channel of an array detector chip one by one in an active coupling manner; the array lens is coupled between the 45-degree total reflection surface of the V-shaped groove in the 45-degree optical fiber array and the array detector chip in an active coupling manner, so that light emitted from each channel of the 45-degree optical fiber array is coupled into the corresponding channel of the array detector chip, and when the optimal coupling position is reached, glue dispensing is performed, and the light emitted from each channel of the 45-degree optical fiber array is obtained. And the side surface of the array lens is fixed with the side surface of the cover plate in the 45-degree optical fiber array. The beneficial effects are that the optical receiving end is optimal in performance, highest in yield and low in cost.

Medical systems, devices, and methods for determining whether a blood vessel is a vein or an artery. The system includes an optical fiber configured for insertion into a blood vessel coupled with a console having a light source, an optical receiver, processors, and logic stored in memory. The optical fiber includes sensors disposed along its length configured to determine a state or condition of the optical fiber. The state or condition can include a strain, movement, pressure, and / or temperature. The logic is configured to analyze reflected signals from the sensors to determine whether the optical fiber is inserted within an artery or within a vein. The logic may also determine a red-blue shift of a projected light to determine a blood flow direction with respect to the optical fiber.

A transimpedance amplifier device for an optical receiver disclosed by the present invention comprises a bias circuit, a transimpedance amplifier and an amplification driving circuit which are connected in sequence, the bias circuit comprises an upper bias structure and a lower bias structure, and the upper bias structure and the lower bias structure are both connected with the transimpedance amplifier to generate different bias currents. It is ensured that the photodiode PD1 can be conducted and generate light current when light passes through the photodiode PD1, the transimpedance amplifier is used for converting the current into voltage to be output, and the amplification driving circuit is used for amplifying the voltage. According to the optical receiver circuit, micro current generated by the photodiode can be converted into output voltage in a relatively high output range through the transimpedance amplifier, and compared with a traditional optical receiver circuit, the optical receiver circuit is relatively low in cost in circuit structure and has the advantages of low power consumption and high reliability. The driving capability of the circuit can be improved under the condition that a complex amplifier loop and a photoelectric conversion module are not needed, the output voltage in a high range is output, and the performance and the stability are further enhanced.

A method is disclosed for use in detecting a pulsed optical beam when the pulsed optical beam is transmitted through a scattering medium, wherein the pulsed optical beam comprises a plurality of optical pulses and the method comprises using a plurality of photodetectors of a photodetector array to detect light which is scattered progressively from the same optical pulse as the optical pulse propagates through a plurality of regions of the scattering medium and which is then received progressively on different photodetectors of the photodetector array. The method may be used in particular, though not exclusively, for non-line-of-sight free-space optical communications. An optical receiver for use in detecting the pulsed optical beam and an associated optical system are also disclosed.

An adjustable bandwidth current-to-voltage converter for use in an optical receiver includes an input configured to receive current from a photodetector; an amplifier stage connected to the input; a feedback path connected to the amplifier stage and to an output, wherein the feedback path includes a feedback element and an operating mode switch configured to set one of photodetector amplifier with dynamic load (PADL) mode and an integrate-and-dump (I&D) mode. The PADL mode is for higher baud operation than the I&D mode.

A receiving module, a detection device, a laser radar and a terminal are applied to the technical field of detection. Wherein the receiving module comprises a first light receiver, a second light receiver and a light splitting device, the light splitting device is used for splitting a light beam from a detection area into a first light beam and a second light beam, the first light beam is transmitted to the first light receiver, and the second light beam is transmitted to the second light receiver. The invention also correspondingly provides a detection device comprising the receiving module, a laser radar and a terminal. In the invention, the two groups of light receivers respectively receive the two paths of light beams divided by the light beams from the detection area, two groups of detection data with overlapped view fields can be obtained, the detection precision is obviously improved, the detection efficiency is ensured, the overall size of the detection device is not obviously influenced, and the heat dissipation pressure is not obviously increased.

Aspects of the subject disclosure may include, for example, obtaining a signal received at a coherent optical receiver, and equalizing the signal using a filter system, wherein the filter system includes a first filter that provides a first filtering characteristic, a second filter that provides a second filtering characteristic, and a third filter that provides a third filtering characteristic, wherein an adjustment rate of the first filter and an adjustment rate of the second filter are each at least ten times an adjustment rate of the third filter, and wherein the adjustment rate of the first filter is at least ten times the adjustment rate of the second filter. Other embodiments are disclosed.

A downhole tool system includes a bottom hole assembly that includes a connector; a laser head; a light source; a sensing assembly; and a controller. The connector is configured to couple to a downhole conveyance run into a wellbore to a reservoir rock formation. The laser head is configured to emit a laser beam toward the reservoir rock formation at a fixed frequency. The light source emitter is configured to emit a light beam toward the reservoir rock formation. The sensing assembly includes at least one optical receiver configured to (1) receive a reflected laser beam and a reflected light beam, and (2) interfere the reflected laser beam with the reflected light beam. The controller is configured to perform operations including generating a speckle interferogram based on the interference; and determining an angular displacement and an axial displacement of the wellbore based on the speckle interferogram.

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.

Technology is disclosed for an optical receiver. The optical receiver may include an optical and digital signal processing (ODSP) device. The ODSP device may include a photodiode operable to convert an optical signal to an electrical signal; a digital signal processor operable to generate a digital signal based on the electrical signal; a quantization component operable to generate a quantized output signal based on the digital signal; and a processing device. The processing device may be operable to measure one or more signal statistics of the digital signal; and identify one or more quantization thresholds, wherein the one or more quantization thresholds are computed based on the one or more signal statistics.

The invention discloses an AFE analog front-end circuit applied to a multi-channel high-speed optical receiver. The circuit comprises an SF-TIA, a single-ended to differential circuit and a CLTE. The SF-TIA, the single-ended to differential circuit and the CLTE are connected in sequence; the SF-TIA is used for converting an input current signal into a voltage signal and transmitting the voltage signal to the single-ended to differential circuit; wherein the current signal is obtained by converting an input optical signal; the single-ended to differential circuit is used for converting the voltage signal into a differential voltage signal and transmitting the differential voltage signal to the CLTE; and the CLTE is used for compensating the high-frequency gain of the differential voltage signal to obtain a compensated voltage signal and outputting the compensated voltage signal. The amplifier has the advantages of being high in gain, low in power consumption, low in input impedance, low in noise, low in requirement for power supply voltage and simple in structure.

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.

Embodiments of the present disclosure may comprise a coherent optical receiver, where the coherent optical receiver comprises a PCSEL that generates a first and a second light beam. In accordance with various embodiments, the physical emission direction of the first light beam may be at an angle of 180 degrees, or 180 degrees plus / minus 10 degrees in some instances, to the physical emission direction of the second light beam. Embodiments may also comprise a first hybrid receiver that receives a first portion of an input light signal to the coherent optical receiver and the first light beam as a local oscillator signal, generating one or more first optical hybrid receiver output signals. Embodiments may also comprise a second hybrid receiver that receives a second portion of the input light signal to the coherent optical receiver and the second light beam as a local oscillator signal, generating one or more second optical hybrid receiver output signals.

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.

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.

An optical receiver includes a plurality of photodetectors, a shared memory, and a pulse calibration processing unit communicatively coupled to the shared memory. The optical receiver also includes a hardware accelerator module configured to accept input waveforms from the plurality of photodetectors and compare an amplitude of the respective input waveforms with a predetermined threshold. Based on the comparison, the hardware accelerator module could determine subsets of the input waveforms and determine information indicative of characteristic aspects of the subsets of the input waveforms. The optical receiver is additionally operable to store the determined information in the shared memory and trigger an interrupt for the pulse calibration processing unit to initiate a pulse calibration process on the determined information.

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.

A system for free-space optical coupling between a 2-dimensional optical transmitter array and a receiver array using planar optics. The system includes: a transmitter array configured to emit one or more light beams; a first planar optic configured to receive the light beams from the transmitter array and to generate one or more intermediate light beams; a first spacer disposed between the optical transmitter array and the first planar optics; a receiver array; a second planar optic configured to receive the intermediate beam and generate one or more output beams toward the receiver array; and a second spacer disposed between the second planar optical device and the light receiver array. The TX portion and the RX portion of the optical coupling system may act as a light emitter (beam manipulator) and a detector, respectively, in a LiDAR system. The planar optics are configured to provide a wide field of view for the LiDAR.

A microscopic object detection system includes a collecting kit and a detection device. The collecting kit has a thin film for converting light into heat and is configured to be capable of holding a sample on the thin film. The detection device detects a plurality of microscopic objects in the sample by collecting the plurality of microscopic objects dispersed in the sample with the collecting kit. The detection device includes a laser module, an optical receiver, and a controller. The laser module emits a laser beam with which the collecting kit is irradiated. The optical receiver detects the laser beam from the sample held by the collecting kit and outputs a detection signal thereof. The controller calculates an amount of the plurality of microscopic objects collected in the sample based on a change of the detection signal over time.

A composite semiconductor inspection system is provided, which includes a multi-axis sample stage, an optical measurement subsystem, an X-ray measurement subsystem and a processing device. The optical measurement subsystem includes a light source generator, an incident-end optical element group, a receiving-end optical element group and an optical receiver. The optical receiver is used to receive an optical signal to-be-measured and generate corresponding optical spectrum information. The X-ray measurement subsystem includes an X-ray generator, an X-ray optical element group and an X-ray detector. The X-ray detector is used to receive an X-ray signal to-be-measured and generate corresponding X-ray spectrum information. The processing device is configured to execute a fitting analysis program based on the optical spectrum information and the X-ray spectrum information to obtain structural parameters of a sample to-be-tested as analysis results.

The embodiment of the invention provides a photoelectric detector, an optical receiver, an optical module and a manufacturing method of the photoelectric detector, in the photoelectric detector, a transition layer is arranged between a collection layer and an absorption layer, so that the size of the collection layer can be reduced; and the transition layer can limit the electric field between the collection layer and the absorption layer within the size range of the collection layer, so that the junction capacitance of the photoelectric detector can be reduced, the size of the absorption layer is not influenced, and the photoelectric detector can simultaneously realize large bandwidth and high coupling tolerance. The photoelectric detector comprises an epitaxial structure; the epitaxial structure comprises a first contact layer, an absorption layer, a transition layer, a collection layer and a second contact layer which are stacked; the size of the collecting layer in the first direction is smaller than that of the transition layer in the first direction, and the first direction is perpendicular to the stacking direction; the edges of the transition layer and the collection layer form a first step; the doping concentration of the dopant in the transition layer is less than or equal to 1e16 atoms / cubic centimeter.

The utility model discloses a self-calibration multi-grating monochromator. The self-calibration multi-grating monochromator comprises a self-calibration assembly, a grating spectrum system assembly and an optical receiver. The self-calibration assembly comprises a focus lens, a standard light source and a single-face reflector. And the standard light source is used for emitting a light beam with a specified wavelength to the single-sided reflector. And the single-sided reflector is used for reflecting the light beam to the focus lens, and the light beam is focused to the incident end of the grating spectrum system assembly through the focus lens. According to the utility model, an automatic calibration structure composed of the standard light source and the single-sided reflector is arranged at the incident end of the grating spectrum system assembly, so that the monochromator can emit a light beam with a specified wavelength through the standard light source when being used for a long time, and automatic calibration of the grating spectrum system assembly is realized in cooperation with the light receiver. Besides, the single-sided reflector is installed on the sliding rotary table, so that the single-sided reflector gives way when the grating spectrum system assembly is normally used, and interference with external light is avoided when the grating spectrum system assembly is normally used.

An electronic device comprises a housing configured to contact a user's skin, an optical transmitter array, an optical receiver, a memory element and a processing element. The optical transmitter array outputs a plurality of optical signals that pass through the user's skin, each of the plurality of optical signals having one of three wavelengths. The optical receiver receives the optical signals and generates corresponding photoplethysmogram (PPG) signals. The memory element stores absorption constants for deoxyhemoglobin blood content, oxyhemoglobin blood content and glycated hemoglobin blood content, each absorption constant associated with one of the first wavelength, the second wavelength or the third wavelength. The processing element determines a glycated hemoglobin blood level for the user based on a ratio of a determined glycated hemoglobin blood content to a sum of determined deoxyhemoglobin blood content, a determined oxyhemoglobin blood content and a determined glycated hemoglobin blood content.

An optical communication receiver system for a mobile platform includes: a surface having an entrance aperture for entry of an optical communication signal from a remote source; an optical receiver to receive the optical communication signal through the entrance aperture; a reflective layer over at least a portion of the surface to at least partially reflect an alignment beam that is substantially coincident with the optical communication signal; a camera positioned to detect the reflected alignment beam; a processor to determine alignment information about the alignment beam relative to the entrance aperture based on the reflected alignment beam detected by the camera; and a transmitter to transmit the alignment information to the remote source to enable the remote source to center the optical communication signal in the entrance aperture.

A system for free-space optical coupling between a two-dimensional optical transmitter array and a two-dimensional optical receiver array using planar optical elements includes a transmitter array configured to emit one or more optical beams, a first planar optical element configured to receive the optical beams from the transmitter array and generate one or more intermediate optical beams, a first spacer disposed between the optical transmitter array and the first planar optical element, a receiver array, a second planar optical element configured to receive the intermediate optical beams and generate one or more output optical beams directed to the receiver array, and a second spacer disposed between the second planar optical element and the optical receiver array. The TX and RX portions of the optical coupling system can be used in a LiDAR system as a light emitting element (beam steerer) and a detector, respectively. The planar optical element is configured to provide a wide field of view for the LiDAR.

To provide a combined semiconductor inspection system which simultaneously has characteristics such as high efficiency and high accuracy and can be applied to various complicated semiconductor products. The integrated semiconductor inspection system 1 includes a multi-axis sample stage 10, an optical metrology subsystem 12, an X-ray metrology subsystem 14, and a processing device 16. The optical metrology subsystem includes a light source generator 120, an input optical element group 122, a receiving optical element group 124, and an optical receiver 126. The optical receiver receives an optical test signal and generates corresponding optical spectrum information. The X-ray metrology subsystem includes an X-ray generator 140, an X-ray optical element group 142, and an X-ray detector 144. The X-ray detector receives the X-ray test signal and generates corresponding X-ray spectrum information. The processing device is configured to perform a fitting analysis process based on the optical spectrum information and the X-ray spectrum information, and obtain structural parameters of the test sample as an analysis result.

A downhole tool system includes a bottom hole assembly that includes a connector, a laser head, a light source emitter, and a sensing assembly. The connector is configured to couple to a downhole conveyance run into a wellbore to a reservoir rock formation. The laser head is configured to emit a laser beam toward the reservoir rock formation at a fixed frequency. The light source emitter is configured to emit a light beam toward the reservoir rock formation. The sensing assembly includes at least one optical receiver configured to (1) receive a reflected laser beam and a reflected light beam, and (2) interfere the reflected laser beam with the reflected light beam to generate an interferogram. The system includes a controller configured to perform operations including determining one or more wellbore characteristics based on the interferogram.

A sample interval synchronized position notification device includes: a tap coefficient acquisition unit configured to acquire a tap coefficient from an adaptive equalization unit which is configured to perform adaptive equalization of a signal; a group delay calculation unit configured to calculate a group delay based on the tap coefficient; and a shift amount calculation unit configured to calculate a shift amount based on the group delay.

The invention relates to a method and a DAS system for distributed acoustic detection configured to probe at least a first fiber and a second optical fiber. The system makes it possible to probe each of the fibers by pulses at independently configurable temporal widths and frequencies and then receive, by special optical receivers, a backscattered signal coming from each scattering point along the entire length of the probed fibers.