272 results about "Optical receivers" patented technology

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 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 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.

The application generally relates to a polarimetric wavefront light detection and ranging (PolLidar) sensor. The PolLidar sensor includes an emitter module having an optical emitter aperture, a receiver module having an optical receiver aperture, and a mirror for scene scanning. The receiver module is separate from the emitter module.

An optical module provided by the present disclosure comprises a circuit board, an optical receiver chip, a TIA chip, a signal processing chip, and an MCU. The signal processing chip comprises a channel configuration register. The MCU comprises a control pin, the control pin being electrically connected to the signal processing chip. When the MCU detects for the first time that a clock signal offset recovered by the signal processing chip is lower than a preset threshold during a power-on process of the optical module, the MCU writes a first register value into the channel configuration register by means of the control pin, so as to disable the signal processing chip receiving a photovoltage signal output by the TIA chip. After a preset period of time, a second register value is written into the channel configuration register by means of the control pin, so as to start the signal processing chip receiving the photovoltage signal output by the TIA chip. When the signal processing chip is locked for the first time, the MCU actively intervenes so as to forcibly interrupt a receiving link of the signal processing chip, thereby effectively isolating a signal instability period during the power-on process, such that the signal processing chip is locked back into a more stable parameter.

This optical fiber wireless transmission system comprises: an optical transmitter (10) that converts a wireless signal and a monitoring swept-frequency signal in a frequency band different from the frequency band of the wireless signal into an optical signal having an intensity and outputs the optical signal as transmitted signal light; an optical receiver (20) that receives the transmitted signal light from the optical transmitter (10) via an optical fiber (40); and an optical fiber deterioration monitoring device (30) that converts backscattered light of the transmitted signal light from the optical transmitter (10) caused by the optical fiber into an electrical signal, detects the monitoring swept-frequency signal as a reference signal, and performs arithmetic processing to obtain an impulse response.

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.

Optical system (1) comprising a primary optical sensor (3) which is protected against environmental influences by an optically transparent protective cover (2), wherein the optical system (1) comprises a contamination detection system (4), wherein the contamination detection system (4) comprises at least one optical transmitting unit (5, 6) and at least one optical receiving unit (7, 8), wherein a first transmitting unit (5) is configured to couple a first light signal into the protective cover (2) in such a way that the first light signal propagates in a directed manner with at least one total internal reflection within the protective cover (2) on a first propagation path (9), wherein a first receiver unit (7) is configured to couple out and receive the first light signal from the protective cover (2) at one end of the first propagation path (9), wherein the contamination detection system (4) is configured to detect contamination (11) on a surface of the protective cover (2) along the first propagation path (9) by comparing the first light signal received by the first receiver unit (7) with an expected first light signal, wherein the optical system (1) is configured such that by rotating and / or shifting the contamination detection system (4) the first propagation path (9) within the protective cover (2) is shifted and / or rotated so that the contamination detection system (4) detects contamination (11) along the surface of the protective cover (2) swept by the first propagation path (9); characterized by the fact that the contamination detection system (4) comprises a second optical transmitting unit (6) and a second optical receiving unit (8) which, according to the first propagation path (9), form a second propagation path (10) through the protective cover (2) by means of a second light signal, wherein the second propagation path (10) differs from the first propagation path (9).

The sensor module (1) comprises an optical sensor element (2) and an evaluation circuit (3). The optical sensor element (2) comprises at least one optical transmitter (21) and at least one optical receiver (22). The optical sensor element (2) is configured for contactless communication with an optical interface (110) of an electronic device (100). The optical sensor element (2) is further configured to optically detect at least one sensing parameter. An evaluation circuit (3) is electrically connected to the optical sensor element (2) and is configured to determine at least one sensing parameter. For example, the at least one optical emitter (21) is a micro LED or any photoemitter.

A detection device includes a sound generator, an optical transmitter, a compound waveguide, an optical receiver, a processor, and a housing element. The sound generator generates a sound signal. The optical transmitter generates an incident light signal. The compound waveguide transmits the sound signal and the incident light signal to a human body portion. Thus, the human body portion transmits a reflected light signal back to the compound waveguide. The compound waveguide further generates a mixed light signal according to the incident light signal and the reflected light signal. The optical receiver receives the mixed light signal. The processor is coupled to the optical receiver. The processor obtains the physiological information of the human body portion according to the mixed light signal. The sound generator, the optical transmitter, the compound waveguide, the optical receiver, and the processor are disposed inside the housing element.

An optical transceiver (200) includes a fiber-laser transmitter (202) configured to transmit a transmit beam (206) toward a target (208) and transmitter optics (204) optically coupled to the fiber-laser transmitter. The optical transceiver also includes an optical receiver (212) configured to receive a return beam (210) and an adaptive active modifier (222) optically coupled to the optical receiver. The optical transceiver further includes a local oscillator (214) optically coupled to the optical receiver and adaptive active modifier. In addition, the optical transceiver includes at least one processing device coupled to the fiber-laser transmitter and adaptive active modifier. The at least one processing device (302) is configured to cause the optical transceiver to turn off the local oscillator during an initial time interval, emit a stream of laser pulses using the fiber-laser transmitter during the initial time interval toward the target, measure the return beam, and determine a translational velocity of the target.

In order to detect occurrence of an influence on quality of an optical signal due to a non-linear effect of an optical fiber, an optical receiver includes: a demodulation unit that demodulates a received optical signal and outputs a reception signal, and calculates a quality value indicating quality of the optical signal; an extraction unit that extracts, from the reception signal, transmission power being a value indicating optical power at a time of transmitting the optical signal; an arithmetic unit that determines a change rate of the quality value to the transmission power; and a monitoring unit that determines, based on a comparison result between the change rate and a predetermined threshold, an influence of a non-linear effect in the optical signal.

The invention relates to the field of integrated circuit design, in particular to a burst mode trans-impedance amplifier circuit for a 50G PON (Passive Optical Network), which comprises a high-frequency signal main circuit and a quick response auxiliary circuit, and the high-frequency signal main circuit realizes high-sensitivity amplification of low-optical-power signals and low-gain amplification of high-optical-power signals through the variable-gain transimpedance-stage amplification circuit and the amplitude-limiting post-stage amplification circuit. The quick response auxiliary circuit realizes ordered quick gain control and quick direct current bias elimination through a quick average value detection circuit controlled by different reset signals generated by the two circuits, and realizes quick response to burst signals together with the high-frequency signal main circuit. The device has the characteristics of high bandwidth, quick response and the like, can stably convert and amplify 50Gbps burst signals, and is suitable for a 50G PON uplink burst mode optical receiver system.

Various embodiments described herein may include a laser rangefinder or another mobile optical device, the laser rangefinder or the other mobile optical device including: an integrated display, or an external interface to couple to another display; a line-of-sight communication interface capable of communication with a remote system when at least one optical receiver of the line-of-sight communication interface has line of sight to a light-transmission module of the remote system; processing circuity to, in response to the at least one optical receiver capturing light transmitted over-the-air from the light-transmission module: recover one or more values bases on the captured light; and present the one or more values, or information derived therefrom, using the integrated display, or transmit a signal representing the recovered one or more values, or the information derived therefrom, over the external interface. Other embodiments may be disclosed and / or claimed.

A parallel interconnect system for transmitting data comprising: a plurality of light sources for emitting light for use as a carrier for the data; a first optical transceiver array having at least one optical transmitter; at least one fiber array configured to transmit light emitted by the at least one optical transmitter; an first optical coupler configured to couple the plurality of light sources to one end of the at least one fiber array; a second optical transceiver array having at least one optical receiver; a second optical coupler configured to receive and direct the transmitted light from another end of at least one fiber array to the second optical transceiver array.

The application discloses a phase-sensitive optical receiving system for enhancing inter-satellite laser pointing measurement, comprising: an optical transceiver unit for receiving an input laser signal to be measured, collimating and beam-reducing the laser signal to be measured, obtaining a beam-reduced laser signal and outputting the same; a phase-sensitive amplification unit for receiving the input beam-reduced laser signal and pump laser, processing the beam-reduced laser signal and the pump laser, obtaining a power amplified signal and outputting the same; an optical receiver unit for receiving an optical amplified signal and a local oscillation laser, processing the optical amplified signal and the local oscillation laser, obtaining four electronic signals and outputting the same; and a data processing unit for receiving the four electronic signals, demodulating the four electronic signals, obtaining laser pointing information and outputting the same. The application implements noiseless amplification on an incident laser pointing signal through the phase-sensitive optical receiving system, and improves the detection sensitivity of a spacecraft laser pointing system.

Reduce signal bandwidth tilt. [Solution] The optical receiver 100 receives and processes the received optical signal received via the optical transmission path. The optical receiver 100 includes a DSP 105 that outputs information regarding the deviation of the amplitude characteristics of the received signal (intraband tilt), a TOF 101 that filters the received signal, and a control unit 106 that controls the settings of the TOF 101 based on the intraband tilt. For example, the control unit 106 reduces the intraband tilt by variably controlling the center frequency of the TOF.

To provide an optical transmission device, an optical transmission system, and an optical transmission method that suppress an OSNR penalty due to return light.SOLUTION: An optical transmission device disposed at a fiber end of a single-core optical fiber and used when signal light is bidirectionally transmitted through the optical fiber, the optical transmission device comprising an optical transmitter configured to transmit first signal light in one direction belonging to the signal light, an optical receiver configured to receive second signal light in a reverse direction belonging to the signal light, and a controller configured to guide the first signal light transmitted from the optical transmitter to the optical fiber, An optical circulator configured to guide the second signal light from the optical fiber to the optical receiver; and a light source configured to output, to the optical fiber, excitation light that Raman-amplifies the second signal light to second optical power higher than first optical power of the first signal light.SELECTED DRAWING: Figure 2

The present invention relates to an optical receiver unit for a position measurement system that determines spatial position information. The optical receiver unit comprises a measuring cell that includes a diffraction grating and an optoelectronic detector whose photosensitive surface is oriented towards the diffraction grating. The measuring cell is arranged in a housing that has a cover element in the diffraction grating area, which is transparent to a measurement wavelength. The cover element includes a conductive layer electrically connected to the housing.

A detection apparatus includes: a support component which comprises a base and a first mechanical part, a first groove and a second groove are provided on the base, a second light exit window and a second light entry window are provided on the first mechanical part, the first groove communicates with the second light exit window, and the second groove communicates with the second light entry window; the base forms a first accommodating cavity and a second accommodating cavity with the FPC, the first accommodating cavity corresponds to the first groove, and the second accommodating cavity corresponds to the second groove; an optical transmitter is disposed in the first accommodating cavity, and an optical receiver is disposed in the second accommodating cavity; and a first electrode is disposed on the FPC, and the first electrode is electrically connected to the first mechanical part through the base.

This invention relates to a fast-response RSSI circuit, a high-speed burst-mode transimpedance amplifier chip, and an optical receiver module, belonging to the fields of integrated circuits and optical communication. The invention addresses the problems of traditional optical receiver modules relying on external, independent high-voltage sample-and-hold chips to monitor APD photocurrent, resulting in large PCB area, high system cost, low integration, and complex R&D and debugging. The RSSI circuit described in this invention is integrated within the transimpedance amplifier chip and manufactured using the same constant-voltage process. It includes: a transimpedance amplification and monitoring unit providing a monitoring differential voltage proportional to the input photocurrent; an integral feedback control unit generating a global control voltage; a dynamic current allocation unit adaptively allocating a reference current in response to the global control voltage; a DC component management unit extracting the DC component of the input node; a bias calibration unit eliminating fixed bias components; and a signal output unit outputting a received signal strength indication signal proportional to the input photocurrent.

The present disclosure relates to handheld electronic devices. A portable electronic device can include a housing including a front cover defining a front outer surface, and a display positioned below the front cover and including a set of transparent conductive traces positioned in a graphical active area of the display and including a first plurality of transparent conductive traces and a second plurality of transparent conductive traces oriented perpendicular to the first plurality of transparent conductive traces. The portable electronic device can also include a proximity sensor including an optical emitter positioned below the display and configured to emit light through the display and through the front cover. The optical emitter can be arranged relative to an optical receiver along a direction oblique to the first plurality of transparent conductive traces and the second plurality of transparent conductive traces.

Due to the line-of-sight nature of optical wireless communication and the limited field of view of optical receivers, the coverage of an access point (120) and the overlapping coverage area of neighboring access points (120) in an optical system are smaller compared to RF systems. Supporting secure roaming of an endpoint (110) in an optical multi-cell wireless communication network (100) becomes more challenging. To address this problem, a subsystem is disclosed that selects a candidate access point for an endpoint (110) from a plurality of access points (120) based on one or more neighbor relations and informs the endpoint (110) about the candidate access point to trigger the endpoint (110) to start a process to pre-establish a new pairwise transient key between the endpoint (110) and the candidate access point (120) for a secure handover.

The invention relates to an optical system (10) comprising an energy input terminal (11) receiving optical energy from an optical energy source, a converter (12) configured to convert an analog electrical signal into a digital electrical signal, and at least one optical circuit (13) arranged electrically in series between said energy input terminal (11) and said converter (12). The distinguishing feature of the invention is that said optical circuit (13) comprises at least one optical receiver (131) including at least one electrode configured to convert the optical energy received from the energy input terminal (11) into an analog electrical signal; at least one resonance circuit (132) including a coil, a capacitor, and a resistor connected in parallel to one another and configured to process the electrical signal received from said optical receiver (131); and at least one amplifier (133) configured to amplify the processed electrical signal received from said resonance circuit (132).

The invention relates to a spectrum technology, and particularly provides a dual-mode photolysis rate analyzer and a method. The analyzer comprises an optical receiving head and a spectrograph; the optical unit comprises a collimator, an optical filter and a detector, the spectral responsivity of the combination of the optical filter and the detector simulates the spectral characteristics of the photolysis reaction, and the output electric signal of the detector is in direct proportion to the photolysis frequency of the factor to be detected; the optical fiber is used for transmitting output light of the receiving head to the spectrograph and the optical unit; for the same factor to be measured, the switching unit selectively adopts output results of the spectrograph and the optical unit according to a measurement environment; the spectrograph and the optical unit are arranged in the case, and the temperature control unit is used for adjusting the temperature of the spectrograph and the optical unit. The method has the advantages of accurate measurement and the like, and is applied to atmospheric monitoring.

This application provides an optical receiving module, and is applied to the field of coherent communication. The optical receiving module includes a local oscillator laser, a coherent receiver, and a signal processor. The local oscillator laser is configured to output a local oscillator laser signal. The coherent receiver is configured to receive a target optical signal and the local oscillator laser signal, and output a target digital electrical signal based on the target optical signal and the local oscillator laser signal. The signal processor is configured to obtain a current power value of the target digital electrical signal, and obtain a target frequency offset based on the current power value and a target mapping relationship. The signal processor is further configured to adjust a center frequency of the local oscillator laser when the target frequency offset is greater than or equal to a first threshold. In this application, the frequency of the local oscillator laser is adjusted through feedback of the signal processor, and a wavelength etalon may not need to be introduced, thereby reducing costs of the optical receiving module.