364 results about "Optical transmitter" patented technology

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.

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 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.

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 utility model relates to an optical emission module and an optical interconnection structure. The light emitting module comprises a first electric chip used for providing a driving signal; the laser is connected with the first electric chip and is used for emitting light under the action of the driving signal, and the light emitting direction of the laser deviates from the first electric chip; the light path adjusting unit is arranged on a light emitting path of the laser, and the light path adjusting unit is used for adjusting a light path of a light beam from the laser, so that a preset included angle is formed between emergent light and incident light of the light path adjusting unit.

To provide an optical transport device that enable the strengths of optical signals to be recovered when the strengths of the optical signals vary, an optical transmission device comprises: a wavelength selection switch that attenuates, in accordance with an attenuation amount, each of a plurality of optical signals outputted from a plurality of optical transmitter, multiplexes and outputs the attenuated optical signals; and an optical detector that detects and compares the strength of at least one of the plurality of optical signals with a first threshold value and a second threshold value higher than the first threshold value. On the basis of the result of said comparison, the wavelength selection switch controls the attenuation amount such that the optical signal the strength of which has been detected has a strength value between the first threshold value and the second threshold value.

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.

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.

An optical transmitter according to the technology of the present disclosure converts an occurrence probability of a symbol (X) into a histogram, and determines allocation of a DAC (121) on the basis of a cumulative frequency of the histogram, a class value of the histogram is a value of the symbol (X), a frequency is non-zero in any class, and a total number of the frequencies is a quantization number of the DAC (121).

An optical device includes a generator, a light emitter, a modulator, an optical amplifier, a current source, a storage, and a controller. The generator generates an electric signal of a multilevel amplitude modulation method. The light emitter emits laser light. The modulator modulates the laser light using the electric signal and outputs an optical signal. The optical amplifier optically amplifies the modulated optical signal according to a drive current. The current source adjusts the drive current to be supplied to the optical amplifier. The storage previously stores an information with respect to input-output characteristics of the optical signal in the optical amplifier relative to drive current value of the drive current. The controller acquires, from the storage, the input-output characteristics corresponding to the drive current value of the drive current supplied to the optical amplifier and controls the electric signal based on the acquired input-output characteristics.

An optical transmitter that multiplexes wavelength channels includes: a first light source; one or more second light source each having a different wavelength; collimator lenses coupled to respective outputs of the first and second light sources; an optical multiplexer that causes an output light beam from the first light source to be transmitted from a first end surface to a second end surface, causes the output light beam from the first light source to be reflected by a reflecting mirror, causes an output light beam from the second light source to pass through a wavelength filter, causes the output light beam from the second light source to be reflected by the reflecting mirror, and causes output light beams of the respective wavelength channels, to sequentially multiplex the output light beams of the respective wavelength channels; and beam splitters respectively inserted between the collimator lenses and the first end surface.

The disclosure relates to an optical transmitter (100) comprising: an optical part (110) carrying at least one optical lens (111a, 111b, 111c) configured to transmit an optical signal; a holder part (120) for holding the optical part (110); wherein the optical part (110) is aligned in a certain position (112, 113, 114) relative to the holder part (120) based on a transmission efficiency criterion of the optical transmitter (100); and an adapter part (130) fixing the optical part (110) in the certain position (112, 113, 114) relative to the holder part (120); wherein the adapter part (130) comprises at least one first fixing section (132) that is fixing the holder part (120) to the adapter part (130) by first laser welds (134); and wherein the adapter part (130) comprises at least one second fixing section (131) that is fixing the optical part (110) to the adapter part (130) by second laser welds (133).The disclosure further relates to a method for manufacturing such an optical transmitter.

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.

The utility model discloses a dual-emission optical device, which comprises a shell, an accommodating cavity, a first coupling end, a second coupling end, a third coupling end, an optical emitter, a tail fiber, a lens table, a transmission and reflection optical filter and an adjusting structure. The accommodating chamber is used for accommodating the light emitter and other optical elements, the first coupling end and the second coupling end are arranged oppositely, and the third coupling end is perpendicular to the first coupling end and the second coupling end and is coupled with the light emitter and the tail fiber respectively. The lens table is located in the middle of the containing cavity and guides a light path of the light emitter to the tail fiber, the transmission and reflection optical filter is installed on the lens table, and angle adjustment can be carried out through the adjusting structure so as to optimize the optical signal transmission efficiency. The adjusting structure comprises a fixing block, an ejector rod, an adjusting knob, a limiting sliding block, a guiding sliding groove, a groove and a tension spring. The structure can realize bidirectional high-power light emission, is suitable for different working environments, has high-precision optical coupling capability, and is suitable for high-power light emission and high-precision optical coupling scenes.

The application discloses a wave plate cascade disturbance device and method based on outer rotation and inner rotation forms, and the device comprises an optical transmitter, a disturbance module and a calculation module. The method comprises the following steps: acquiring polarized light with a fixed polarization state; determining a transmission matrix of an outer rotation model and a transmission matrix of an inner rotation model given a disturbance speed and a white noise distribution; performing decomposition conversion processing on the transmission matrix of the outer rotation model and the transmission matrix of the inner rotation model to obtain three-level electrical signals; and performing polarization state adjustment processing on the polarized light with the fixed polarization state according to the three-level electrical signals to obtain adjusted polarized light. The application can independently control the disturbance speed and the polarization probability distribution, improve the controllability of the disturbance model, and realize high-speed polarization disturbance with strong adjustability. The application can be widely applied to the technical field of polarized light disturbance.

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).

An optical wear sensor (1) for identifying the extent of wear of mining or similar equipment. The sensor (1) includes a probe (5) having one or more optical element (10), a deflector (4), and a transmitter / detector, and a base (6) which includes a processor (81) and wireless transmitter (33). The optical element (1) is provided within a body of a wear part (11) and has a first end and a second end defining a bi-directional optical signal transmission pathway (3). The optical deflector (1) is formed of deflective material and positioned at said second end of said optical element (10) to reflect the optical signal. The optical transmitter (18) / detector (19) is configured to transmit said optical signal from the first end of said optical element (1), and detect whether or not said optical signal is returned via said optical pathway to said first end of said optical element (10). The processor converts any optical signal received by said optical detector to an electrical response signal, and the wireless signal transmitter (33) transmits the electrical response signal indicative of the wear condition of said body (11) to an output device. A plurality of optical elements (10a - 10e), of differing lengths may be provided to identify the depth or extent of wear.

This invention provides an integrated wavelength division multiplexing (WDM) CPO device, which can improve the space utilization of the product, while improving heat dissipation performance and ensuring that the product performance is not affected. The PCB circuit board has mounting bases arranged on it, with linearly arranged optical receiver mounting slots and optical transmitter mounting slots, which are inclined. The optical receiver and optical transmitter are respectively placed in the optical receiver mounting slots and optical transmitter mounting slots. After being connected to LC connectors, the optical receiver and optical transmitter are optically connected to a multiplexer and a demultiplexer via optical fibers. The multiplexer and demultiplexer are connected to optical ports via optical fibers. The optical receiver and optical transmitter are also electrically connected to electrical chips on the PCB circuit board via a flexible circuit board. The PCB circuit board is connected to electrical ports and power supply interfaces. The mounting base is connected to a heat sink, allowing the optical receiver and optical transmitter to conduct heat to the housing for heat dissipation through the heat sink and / or the mounting base.

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.

The invention provides an optical transmitting assembly and an optical network unit, and belongs to the technical field of optical communication. The light emitting assembly comprises a laser and a photoelectric detector, the photoelectric detector is located in the opposite direction of the emitting direction of the laser, a transmission film arranged at the receiving end of the photoelectric detector corresponds to a transmission peak, the position of the transmission peak is the center wavelength of the working wavelength range, and the laser comprises a laser body and a resistor. The resistor is attached to the DBR area in the laser body. Therefore, when the wavelength of the optical signal output by the laser deviates from the central wavelength, the power of the optical signal detected by the photoelectric detector is gradually reduced, so that the resistor attached to the DBR area in the laser body can be heated based on the power, the refractive index of the DBR area is changed, and the DBR area can output the optical signal close to the central wavelength. Therefore, under the condition that TEC does not exist, optical signals with high wavelength precision can be output.

This invention provides a near-infrared therapy device for improving Alzheimer's disease, characterized by comprising: a frequency-modulated drive circuit 1, a near-infrared LD light source 2, an optical fiber coupler 3, a light source power monitoring photodetector (PD) 4, an optical power monitoring circuit 5, an optical fiber beam splitter 6, an MPO optical fiber cable 7, and an optical transmitter 8. The optical transmitter includes an optical transmitter housing 8-1, a fiber-end hemispherical emitting microlens 8-2, and a beam-shaping coupling lens 8-3. This invention can be used to regulate the metabolism and cellular function of meningeal lymphatic endothelial mitochondrial cells, promote meningeal lymphatic transport in the central nervous system, thereby alleviating the pathological symptoms of Alzheimer's patients and enhancing their cognitive function. The device has a simple and compact structure, is easy to plug and unplug, has low optical signal loss, and high coupling efficiency. It can be widely used in novel non-invasive optical brain-computer interface devices and belongs to the field of fiber optic sensing technology.

A laser diode driver comprises a signal input terminal for inputting an electrical signal, an amplification stage unit for amplifying the electrical signal, a first driving stage unit for converting the amplified signal into a corresponding current, and a current-voltage adapter for outputting a second voltage via a second voltage output line, for absorbing current on the second voltage output line and / or for providing current to the second voltage output line in dependence on a voltage or current on the second voltage output line, the amplification stage unit being located in an upper layer of circuitry, a first operating current of the amplification stage unit forming at least part of an upper layer current, the first driving stage unit being located in a lower layer of circuitry, such that a second operating current is at least partly a continuation of the at least part of the upper layer current, such that operating currents of the amplification stage unit and the first driving stage unit can be at least partly multiplexed, so that power consumption of the laser diode driver can be reduced. The application also provides an optical transmission module.

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 present disclosure provides a low-distortion PAM-4 optical transmitter with a piecewise compensation scheme for VCSEL-based optical communication links. The input half-rate least significant bit (LSB) and most significant bit (MSB) data streams of the transmitter are firstly encoded into half-rate unary-weighted data streams by thermometer encoders. The half-rate unary-weighted data streams are then fed into three data slices with 2-tap feed-forward equalizer (FFE), continuous-time linear equalizer (CTLE), pre-emphasis circuit for serialization and piecewise pre-distortion. Finally, outputs from the three data slices are added in the form of current and fed into VCSEL. A thermal control loop is implemented to monitor the temperature of the VCSEL as well as provide compensation to the bias current of the VCSEL.

An optical transmitter and receiver system splits laser inputs into multiple channels for transmission and reception. The optical transmitter receives a laser input from a forward laser path of a laser source, splits the input into a plurality of transmit channels, and transmits the channels to a destination. The optical receiver receives another laser input from the same forward laser path, splits the input into a plurality of receive channels, and processes the channels to receive data. The optical transmitter and receiver can be used in a variety of applications, including telecommunications, data centers, and industrial control systems.

The invention provides an all-optical satellite architecture method and system for space-based multichannel electromagnetic remote sensing. The method comprises the following steps: a radio frequency signal source respectively generates and simultaneously outputs a radio frequency signal and a control signal; performing low-noise amplification on the radio-frequency signal, inputting the radio-frequency signal into a radio-frequency optical transmitter, further performing low-noise amplification and power amplification, and modulating the radio-frequency signal into an optical signal; transmitting an optical signal into the optical switch through the laser terminal; the receiving end receives a control optical signal obtained by analyzing the control signal, adjusts the receivable wavelength of the receiving end according to the control optical signal, and controls the optical switch to transmit the optical signal; and receiving the optical signal, recovering the optical signal into a radio-frequency signal, performing low-noise amplification and power amplification, outputting the radio-frequency signal, and performing time delay correction. According to the invention, the problems of limited transparent forwarding bandwidth and huge scale required by long-distance radio frequency transparent forwarding are solved, the forwarding is flexible, the bandwidth is large, the miniaturization is realized, the delay disturbance and the phase disturbance are low, and the problem that the radio frequency forwarding on the same satellite is limited is solved while the multi-path radio frequency signal forwarding is realized.

The invention relates to a three-wavelength light emitter based on a binary optical lens. The three-wavelength light emitter comprises a first laser chip used for generating a first Gaussian beam; the second laser chip is used for generating a second Gaussian beam; the third laser chip is used for generating a third Gaussian beam; the first binary optical lens is used for diffracting the first Gaussian beam and then obliquely irradiating the diffracted first Gaussian beam to a first position point on the end face of the receiving end of the planar waveguide bridging single-mode optical fiber; the second binary optical lens is used for diffracting a second Gaussian beam and then directly irradiating the diffracted second Gaussian beam to a second position point on the end face of the receiving end of the planar waveguide bridging single-mode optical fiber; the third binary optical lens is used for diffracting a third Gaussian beam and then obliquely irradiating the diffracted third Gaussian beam to a third position point on the end face of the receiving end of the planar waveguide bridging single-mode optical fiber; the first position point, the second position point and the third position point are respectively located at different positions of the end face of the receiving end of the planar waveguide bridging single-mode fiber; according to the invention, the optical path structure of the 50G PON optical device is simplified, and the production cost and working hours of the 50G PON optical device are saved.

The utility model relates to an industrial X-ray photographing device, which comprises an X-ray transmitter, an imaging plate and a driving device, x-rays emitted by the X-ray transmitter penetrate through a detected object and then irradiate the imaging plate for imaging so as to shoot the detected object; the driving device drives the X-ray transmitter and the imaging plate to be synchronously close to or far away from each other, so that the shooting distance is adjusted, and different shooting requirements are met; wherein the X-ray transmitter or the imaging plate is further fixedly connected with a distance sensor, and the distance sensor detects the distance between the X-ray transmitter and a detected object, so that the focal length of the X-ray transmitter is adjusted through the driving device; furthermore, the X-ray emitted by the X-ray emitter is adjustably shielded through the dimming mechanism, so that the irradiation range of the X-ray is adjustable, and different use requirements are met; the structure is simple, the cost is low and the size is small.

An optical device includes a substrate, a tapered waveguide that is arranged in a first layer on the substrate and that has a waveguide width that gradually increases from input to output, a rib waveguide that is arranged in a second layer on the substrate, where the second layer is different from the first layer, and overlaps with the tapered waveguide in a plane direction. The rib waveguide includes a rib that has a core width that gradually increases from the input to the output, and slabs that are arranged on both sides of the rib and that have slab widths that gradually increase from the input to the output.