861 results about "Optical receivers" 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.

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.

In one embodiment, a system includes a first light source configured to produce a first beam of light at a first frequency and a second light source configured to produce a second beam of light at a second frequency, where the first and second frequencies are offset by a frequency offset Ω. The system also includes one or more optical elements configured to: direct the first and second beams of light to a sample, and collect a Raman signal produced by the sample in response to the first and second beams of light. The system further includes an optical receiver configured to detect the Raman signal. The optical receiver includes a third light source configured to produce a third beam of light at a third frequency, where the third light source includes a wavelength-tunable laser, where the third frequency is adjustable.

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.

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.

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 a photoacoustic-OCT (optical coherence tomography) bimodal endoscopic imaging system based on multi-element focusing. The photoacoustic-OCT bimodal endoscopic imaging system comprises a signal control module, an optical coherence tomography module, a photoacoustic signal excitation module, a light beam common-path module, an endoscope probe, a rotary withdrawing module and a data acquisition module, a sample arm of the optical coherence tomography module and the photoacoustic signal excitation module enter the endoscope probe through the light beam common-path module; an optical assembly and a photoacoustic receiver are arranged in the endoscope probe, and the optical assembly focuses OCT and photoacoustic combined laser and then irradiates target tissue with the focused OCT and photoacoustic combined laser; an ultrasonic signal generated after the target tissue is irradiated by the pulse laser is received by the photoacoustic signal receiver and converted into an ultrasonic electric signal, and the ultrasonic electric signal is sent to the data acquisition module; the rotation withdrawing module controls the endoscope probe to conduct three-dimensional body data scanning, and the data collecting module receives OCT interference signals and ultrasonic electric signals of the opto-acoustic receiver. Compared with the prior art, the device has the advantages of large working distance, high resolution and less influence by water.

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.

An optical receiver includes: a data processing circuit used to receive an optical signal carrying data information and perform a signal processing on the optical signal to obtain the data information and performance parameter (s) for indicating transmission quality of the optical signal; a memory used to dynamically buffer waveform data obtained through the signal processing of the optical signal; and a detection controller used to output a first indicating signal to the memory in a case where the at least one performance parameter satisfies a first condition. The first condition includes that the optical signal has a transmission fault and / or the transmission quality of the optical signal decreases to a first degree. The memory is further used to freeze current waveform data to obtain frozen waveform data in response to the first indicating signal, and the frozen waveform data includes waveform characteristic information of the transmission fault.

A sender system 2 is equipped with an optical transmitter 20 that transmits an encoded optical signal 40 at a predetermined strength via a line-of-sight (LOS) communication channel 4, and a key distillator 21 that generates a cryptographic key from a random bit sequence outputted by the optical transmitter 20 through a key distillation processing via an authenticated public communication channel 5. A legitimate receiver system 3 is equipped with an optical receiver 30 that receives the optical signal 40 from the optical transmitter 20 via the LOS communication channel 4, and a key distillator 31 that generates a cryptographic key from the random bit sequence outputted by the optical receiver 30 through the key distillation processing via the authenticated public communication channel 5.

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 optical receiver comprises a monolithically integrated pin photodiode (PIN) and transimpedance amplifier (TIA). The TIA comprises InP heterojunction bipolar transistors (HBT) fabricated from a first plurality of layers of an epitaxial layer stack grown on a SI:InP substrate; the PIN is fabricated from a second plurality of layers of the epitaxial layer stack. The p-contact of the PIN is directly connected to the input of the TIA to reduce PIN capacitance CPIN. The TIA capacitance CTIA may be matched to CPIN. Device parameters comprising: a thickness of the absorption layer, window area, and an optional mirror thickness of the PIN; device capacitance CPIN+CTIA; and feedback resistance RF of the TIA; are optimized to performance specifications comprising a specified sensitivity and responsivity at an operational wavelength. This design approach enables cost-effective fabrication an integrated PIN-TIA, for applications such as a 1577 nm receiver for an ONU for 10G-PON.

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.

An optical receiver includes a receiving component, a log-likelihood ratio component, and a forward error correction decoder. The receiving component may be configured to receive a data transmission of transmitted data and convert a portion of the data transmission into one or more digital samples. The log-likelihood ratio component may be configured to generate a log-likelihood ratio value using a set of the one or more digital samples. The forward error correction decoder may be configured to correct errors in in the log-likelihood ratio value and recover the transmitted data using the log-likelihood ratio value.

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.

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.

An optical receiver comprises a variable optical attenuator (VOA), a photodiode (PD) which may be a pin-PD or an APD, a transimpedance amplifier (TIA), and a feedback / control circuit for adjusting a bias voltage of the VOA in response to an optical input signal level, to provide an attenuated optical output signal to the PD having a narrower dynamic range. Providing signal level adjustment in the optical domain mitigates the requirement for a TIA with a large dynamic range and provides for fast switching. The optical receiver may comprise a waveguide configuration, wherein a first electro-absorption modulator (EAM) is operable as the VOA and a second EAM is operable as the photodiode. A monolithically integrated electro-photonic circuit comprising the VOA, PD, TIA and feedback / control circuit may be provided using InP-based semiconductor materials.

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.

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 system and method for imaging gas emissions is provided which may include a laser transmitter responsive to a first and second control signals to produce a frequency-modulated continuous-wave (FMCW) first optical output, an optical routing network configured to accept the first optical output and route at least a first portion to an optical receiver, and a controller programmed to generate the second control signal, respond to input from the wavelength reference unit to generate the first control signal and deliver the first control signal to the laser transmitter, and to calculate, using the second control signal and input from the optical receiver, a path absorption.

The invention, which relates to the technical field of the optical receiver, discloses a silicon optical transceiver chip comprising an oblique incidence grating coupler, a symmetrical bidirectional angle multimode interference coupler, a micro-ring modulator, a micro-ring filter, and a single-input photoelectric detector. Each oblique incidence grating coupler is composed of a grating area and a spot-size converter, a certain coupling inclination angle is adopted by a grating etching part through an optical fiber, optical signals are obliquely incident into a grating coupling area, the optical signals are converted into single-mode conditions through the spot-size converters and transmitted into an optical waveguide, and then the input and output functions of the optical signals are achieved. According to the invention, a plurality of micro-ring modulators are used for converting electric signals into optical signals for information transmission, and a receiving part is combined with a micro-ring filter to realize a secondary filtering function, so that the crosstalk problem between two adjacent optical information transmission channels can be reduced.

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 embodiment of the invention provides an ROF photodiode, a manufacturing method thereof and an optical receiver, and belongs to the technical field of photoelectric detection. The ROF photodiode comprises: a wafer substrate; the intrinsic absorption layer is arranged on the upper surface of the wafer substrate; the light-transmitting flat layer is arranged outside the intrinsic absorption layer in a covering manner, and one surface of the light-transmitting flat layer, which is used for receiving the Gaussian light emitted into the ROF photodiode by the optical fiber, is provided with a flat surface; the micro lens is arranged on the flat surface of the light-transmitting flat layer, and the center of the micro lens is aligned with the center of Gaussian light emitted by the optical fiber; gaussian light emitted by the optical fiber is converged after passing through the micro lens, and after the converged Gaussian light passes through the light-transmitting flat layer, the power density peak value is dispersed and weakened, and the converged Gaussian light is converted into flat-topped light to be emitted into the intrinsic absorption layer. According to the ROF photodiode, Gaussian light emitted by the optical fiber is dispersed, weakened and converted into flat-topped light, the electric field suppression effect caused by light power peak value concentration is avoided, the good bandwidth characteristic is guaranteed, and the light response performance is improved.

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.