1803results about "Electromagnetic transmitters" patented technology

The invention discloses an HPLCamp (High Performance Liquid Chromatography) based on deep learning. The invention discloses an HRF dual-mode communication adaptive coding modulation and anti-noise method. The method comprises the following steps: acquiring an optical radio frequency signal amplitude-phase change rate and synchronously sampling and normalizing; calculating a node amplitude-phase residual error to generate a nonlinear mapping coefficient; monitoring coherent change to solve a drift trend, adjusting a modulation coding optimization scheme, compensating distortion and outputting an anti-noise result. According to the method, the instantaneous amplitude and phase of the optical radio frequency dual-mode signal are extracted, a multi-dimensional amplitude-phase characteristic matrix is formed in combination with time domain synchronization and a normalization template, differential residual modeling and nonlinear mapping coefficient calculation are carried out between impedance nodes, and dynamic compensation of amplitude-phase mismatch and envelope offset is achieved. A drift trend quantity is generated based on coherent offset parameter differentiation, feedback is provided for modulation format and coding strategy optimization, amplitude equalization and phase correction are completed, the signal synchronization degree and amplitude-phase consistency are improved, and the steady-state response and anti-disturbance performance of a transmission link are enhanced.

An adaptive modular multimodal communication and computing panel includes a multilayer stack with a protective layer transmissive in selected bands, a reconfigurable communication layer operable in phased array, reflectarray, hybrid phased reflector, free space optical, or quantum modes, and electronics with heterogeneous processors. A multi scale interconnect and input and output fabric couples electrical, radio frequency, guided optical, and free space optical domains through interfaces including electro optic transduction and RF or baseband conversion. The fabric may implement programmable true time delay, resonators, and comb referenced timing. A management system coordinates beamforming, sensing, routing, calibration, workload placement, and security. Panels tessellate and connect by electrical, radio frequency, and fiber optic interfaces, supporting hot swappable modules, blind mate connectors, robotic servicing, and anti tamper features. Power and thermal subsystems harvest, store, regulate, and dissipate energy. The architecture scales from chip level modules to vehicle, airborne, maritime, orbital, and deployable systems.

The invention relates to the technical field of laser, and provides a laser system with a controllable pulse state and a control method thereof. The control method of the laser system with the controllable pulse state comprises the steps that under the conditions that the cavity length of an FP cavity is in an initial fit state and the air pressure in the FP cavity is standard air pressure, a pump light source is controlled to adjust the pump power according to a first set; in response to the fact that the target pulse interval is smaller than the initial pulse interval, the pump light source is controlled to keep the target power unchanged, the air pressure of the FP cavity is adjusted to be within the preset range, and the cavity length of the FP cavity is adjusted through a second set; determining a target cavity length; controlling the laser to be output in a first pulse state; and controlling the laser to output in a second pulse state. According to the control method, the controllably generated abnormal wave form with the high peak power is introduced according to the preset frame structure to serve as a physical layer disturbance or random segment, and the reliability and safety of system signal transmission are improved under the condition that data segment transmission is not affected.

A Rydberg atom television receiver is disclosed. The receiver comprises a probe laser, a source polarizing beam displacer, a Rydberg atom receiver cell, receiver atoms, a detector polarizing beam displacer, a detector polarizing beam cube, a first photodiode, a second photodiode, a differential amplifier, a display, and a coupling laser. The receiver receives a modulated waveform imprinted on a radiofrequency carrier a displays a graphical representation corresponding to a modulation source.

The invention provides a well drilling anti-interference communication system based on a VCSEL (Vertical Cavity Surface Emitting Laser), the VCSEL and a manufacturing method thereof, and the manufacturing method comprises the following steps: calculating the light field intensity distribution of a high-order transverse mode through an intrinsic mode expansion method and a Laguerre-Gaussian model based on the epitaxial structure parameters of a laser; determining a target area which begins to perform downward annular etching on the surface of the p-DBR layer, wherein the target area coincides with a light field intensity peak area of the high-order transverse mode; performing annular etching in the target area to form an annular groove, and etching at least seven pairs of p-DBR layers inwards in the groove; the communication system comprises a signal transmitting end arranged on the derrick side, and the signal transmitting end is provided with the vertical cavity surface emitting laser; the p-DBR region of the vertical cavity surface emitting laser is provided with an annular etching structure; the graded-index fluorinated plastic optical fiber is used as a transmission medium and is connected with the derrick side and the logging room side; and the optical signal receiving end is arranged at the logging room side and is used for receiving and converting the optical signal into an electric signal.

An exemplary embodiment of the invention relates to a radar system comprising a radar transmission unit (200), a radar reception unit (300), and a central unit (100) which is optically connected to the radar transmission unit (200) and the radar reception unit (300), wherein at least one of said units comprises a signal separator (500) configured to separate a first signal from a second signal, said first and second signal being comprised in a respective optical carrier signal that said at least one unit receives, the signal separator (500) outputting the first signal at a first electrical output port (P1) and the second signal at a second electrical output port (P2), wherein the signal separator (500) comprises a photodetector (510) configured to receive the respective optical carrier signal and generate a photocurrent (Ip), and wherein the signal separator (500) is configured to extract both the first signal and the second signal from said same photocurrent (Ip) in the electrical domain.

The invention discloses a light-weight wide-angle atmosphere laser communication device, system and method based on reverse modulation inertial navigation cooperation, and solves the technical problem that an existing atmosphere laser communication system is large in size and weight. The atmosphere laser communication system comprises at least one active communication device and at least one passive communication device, wherein the active communication device comprises a first main control unit, an optical signal generation modulation unit, a direction adjustment unit, a first optical receiving unit, a first optical signal acquisition unit, a first electric signal processing unit and an aiming unit; the pointing adjustment unit comprises an inertial navigation measurement module and a first MEMS fast reflecting mirror; the passive communication device comprises a second optical receiving unit, a second optical signal acquisition unit, a second electric signal processing unit, a second main control unit and an MRR modulation unit. According to the invention, a scheme of cooperation of light beam pointing compensation and reverse modulation of inertial navigation measurement is adopted, and the problem that the communication field angle, volume and weight of an atmospheric laser communication system are mutually restricted is solved.

The invention discloses an information processing system and method for improving the reachable rate of atmospheric channel information, belongs to the technical field of atmospheric laser communication, and solves the technical problems that in the prior art, due to the fact that fixed probability distribution is usually used in traditional probability shaping, sending signal probability distribution cannot be adaptively changed according to actually measured turbulent channel conditions, and the probability distribution cannot be changed. And therefore, the quality of received signals is reduced, and the communication performance is influenced. A temperature pulsator is arranged at a transmitting end, a real-time signal-to-noise ratio of a turbulent channel is obtained by calculating an actually measured temperature structure constant, the signal-to-noise ratio serves as an input value and is sent to a neural network module for training, optimal distribution of transmitted signals is output, and the maximum information reachable rate is achieved under the actually measured turbulent channel condition. And then the neural network output value is used as sending signal probability distribution, and is sent to a turbulent flow channel for signal transmission after modulation mapping. The method is used for realizing high-efficiency and high-anti-interference wireless laser communication under an atmospheric turbulence channel.

The invention discloses a non-diffraction laser communication terminal based on Bessel beams. The terminal comprises a beacon transmitting module, an optical antenna module, a beacon receiving module, a signal transmitting module, a signal receiving module and a light splitting module. The beacon transmitting module and the signal transmitting module respectively convert the Gaussian beam into a Bessel beam through an axicon, and the Bessel beam is output through a collimating lens; a primary mirror and a secondary mirror of the optical antenna module are mounted in an off-axis manner, so that light beams are shrunk and expanded; the light splitting module completes light path switching and light splitting through a fast reflecting mirror, a 1 / 4 wave plate, a dichroscope and a polarizing beam splitter; the beacon receiving module obtains beacon light position information through a CMOS detector, and the signal receiving module receives signal light through an APD detector. The non-diffraction characteristic of the Bessel beam is utilized, and the off-axis optical antenna and the polarization beam splitting design are combined, so that high-precision and low-loss laser communication is realized.

The embodiment of the invention provides an optical module, an optical communication system and a communication method, relates to the technical field of optical communication, and reduces the energy consumption of the optical communication system. According to the specific scheme, the first optical module comprises a laser driving unit, a light emitting assembly and a control unit. The laser driving unit and the light emitting assembly form a high-speed channel, the laser driving unit, the light emitting assembly and the control unit form a low-speed channel, and the high-speed channel is used for transmitting service signals. The control unit is used for controlling the laser driving unit to generate a low-speed modulation signal, the light emitting assembly is used for obtaining a first low-speed light signal based on the low-speed modulation signal and sending the first low-speed light signal to the light receiving assembly of the second light module, and the first low-speed light signal is a non-service signal between the first light module and the second light module. The embodiment of the invention is used for the optical communication process between the first network equipment and the second network equipment.

The invention belongs to the technical field of laser spot positioning, and discloses a method and a device for extracting a spot centroid of a four-quadrant detector. A first linearly polarized light beam and a second linearly polarized light beam which are consistent in wavelength and orthogonal in polarization are generated through an emission optical system, the two linearly polarized light beams are modulated, different modulation frequencies are given to the two linearly polarized light beams, and the two linearly polarized light beams are combined into one beam of composite light to be emitted; receiving the composite light by using a receiving optical system; separating the composite light into first linearly polarized light and second linearly polarized light by using a polarization bifocus prism, and enabling the two beams of light to respectively form focuses which are staggered front and back; a four-quadrant detector is used for receiving a pre-focus light spot and a post-focus light spot, and the four-quadrant detector is arranged at the middle position of the two focuses; a signal processing system is used for processing signals output by the four-quadrant detector, and light spot centroid information is obtained through calculation. According to the invention, the weak signal detection efficiency of the four-quadrant detector is improved, and the precision of light spot position calculation is improved.

A communication method including emitting laser pulses as a signal using one or more transmitters at an atmospheric point. Plasma is generated at the atmospheric point to radiate omnidirectional light. The plasma from the atmospheric point is detected using one or more receivers. The one or more receivers have a direct line-of-sight to the atmospheric point to receive the signal from the one or more transmitters via the omnidirectional light generated by the plasma. The signal is demodulated from the transmitted plasma at each receiver, thereby transmitting information encoded on the signal.

The invention discloses a laser-induced sound cross-medium communication method based on passive relay PWM modulation, and relates to the technical field of cross-medium communication. The method comprises the following steps: adjusting the laser pulse width of to-be-sent information, and carrying out PWM modulation to obtain a PWM sequence; inputting the modulation sequence into a laser driving control module, and driving a laser to emit a laser pulse signal with specific pulse width change; laser energy is focused on the surface of a passive relay material, and when laser pulses with different pulse widths act on the material, different numbers of sound signals can be excited and generated; a receiving end captures sound signals propagating across media through a hydrophone, and demodulates the sound signals according to a mapping relation between pulse width and the number of the sound signals; and finally, original information is restored, so that cross-medium communication from air to water is completed. According to the invention, PWM modulation is combined with a passive relay material, and the system has the remarkable advantages of no need of underwater power supply, simple structure, high reliability and the like.

The invention discloses an optical flux-inductance-energy integrated system and a transmitted waveform design method, and the method comprises the steps: carrying out the MLS modulation and OFDM modulation of an input original signal, obtaining an MLS waveform and an OFDM waveform, carrying out the amplitude distribution of the two waveforms, and combining the two waveforms according to a time sequence to form an MLS-OFDM AC signal; after the alternating current signal is subjected to digital-to-analog conversion, outputting the alternating current signal according to a set driving peak-to-peak value voltage, superposing a direct current component in the alternating current signal so as to carry out alternating current and direct current amplitude distribution, and outputting an analog electric signal; the transmitter converts analog electric signals into optical signals, and the optical signals are simultaneously connected with the information decoding module, the sensing processing module and the energy collecting module. According to the hybrid MLS-OFDM waveform design scheme combining alternating-current amplitude distribution and alternating-current and direct-current amplitude distribution, flexible balance among communication, perception and energy collection performance in an optical flux-inductance-energy integrated system is achieved, the complexity of the system can be reduced, and the system is made to be lighter and more compact.

A quantum radio frequency (RF) signal transmitter may include a plurality of Rydberg cells, each configured to generate a respective RF signal. A combiner downstream from the plurality of Rydberg cells may be configured to combine the respective RF signals into an output RF signal.

The invention discloses a DP-MZM-based reconfigurable mixer with phase shift and image rejection functions, and belongs to the field of microwave photon signal processing. By adjusting an input radio frequency signal and a direct current bias voltage of the DP-MZM1, four different LO frequency doubling and mixing functions can be realized. By controlling the angle alpha between the polarization direction of the polarization analyzer and one axis of the modulator, the phase of the generated signal can be flexibly tuned in the range of 0-360 degrees. When combined with the optical frequency comb, the multi-channel multi-band frequency conversion system can be expanded into a multi-channel multi-band frequency conversion system with independent phase tuning capability by utilizing the channel switching and frequency slot selection functions of the wavelength selection switch, and parallel output of various frequency mixing results can be realized. By adjusting the phase difference between the two-channel output signals, I / Q mixing, double-balanced mixing and image rejection mixing can be configured. The scheme is not influenced by direct current bias drift, the system complexity is reduced, and the frequency conversion efficiency is improved.

The invention relates to a satellite-borne laser communication system, the system comprises a comprehensive management unit and N laser terminals, the comprehensive management unit is used for electronic modulation and demodulation and data processing, and the comprehensive management unit comprises an optical transceiver module, a digital baseband module and a data routing module; the N laser terminals are used for transmitting and receiving optical signals, and each laser terminal comprises an optical antenna module and a light amplification module; the number of the integrated management units and the number of the laser terminals are sum, wherein N is a natural number greater than 1. The invention provides a '1 + N' function and interface division method and provides a satellite-borne laser communication system which is completed by matching one comprehensive management unit and N miniaturized laser terminals through the idea of'merging similar items + integrated management and control 'and'photoelectric separation', so that each laser terminal does not independently have a photoelectric integrated laser communication function any more, and the communication efficiency of the satellite-borne laser communication system is improved. The laser terminal is responsible for transmitting and receiving optical signals, and the comprehensive management unit is responsible for electronic modulation and demodulation and data processing.

The invention relates to the technical field of automobile lamp communication, in particular to an automobile headlamp free optical communication system and method based on stroboscopic modulation. The vehicle-mounted computer receives road condition information and converts the road condition information into an original bit stream, the anti-interference encoder generates an intermediate signal with a check code, the time-frequency interleaver carries out interleaving, the driving circuit modulates the interleaved intermediate signal, and the vehicle lamp receives the modulated signal and sends out an optical signal in a stroboscopic mode; a photoelectric sensor at a receiving end captures an optical signal emitted by a vehicle lamp, a noise reduction filtering module carries out wavelet noise reduction and filtering processing, a judgment decoding module carries out frame positioning, demodulation and verification on the processed optical signal to generate a restoration bit stream, and a vehicle-mounted computer restores the restoration bit stream into road condition information. And the voice broadcast module carries out voice broadcast on the road condition information. According to the invention, stable communication requirements between vehicles and between the vehicle and the sensing equipment in a closed or semi-closed environment in which electromagnetic signals are seriously disturbed can be met.

The invention discloses a distributed MIMO (Multiple Input Multiple Output) integrated system and method based on a reconfigurable notch chaotic optoelectronic oscillator, belongs to the field of microwave photons, and solves the problems of spectrum resource conflict, difficulty in multi-node synchronization, discrete inductance functions and the like. According to the system, a plurality of independent chaotic OEOs are combined with an optical frequency comb to drive an FIR filtering effect, MIMO chaotic signals with reconfigurable notch frequency points and quantity are generated, and dynamic allocation of spectrum resources is realized. The notch frequency band is used as a communication channel embedded modulation signal, and supports multi-spectrum sharing with 2.4 G, 5G, Wi-Fi and the like; a non-notch frequency band is reserved as a radar signal, and the range resolution is improved by using the broadband characteristic of the chaotic waveform. The star topology optical network expands the coverage area of a distributed system, and a centralized processing architecture reduces the complexity of multi-node collaboration. The invention provides an integrated solution of high-precision environment perception and high-reliability communication for smart cities, Internet of Vehicles and the like, and is suitable for dense urban areas with resource shortage and dynamic multi-service environments.

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.

A multiplexer module and method are herein disclosed. The multiplexer module comprises a WSS configured to receive a plurality of first optical signals, selectively multiplex the first optical signals into a second optical signal, and output the second optical signal; an OPM operable to determine a power of one or more slice within a sample optical signal, the sample optical signal being selected from a group consisting of a particular optical signal of the first optical signals and a portion of the second optical signal including the particular optical signal; a processor; and a memory storing instructions that cause the processor to: validate the particular optical signal using the power of one or more slice within the sample optical signal; and if the particular optical signal is valid, cause the WSS to open a particular passband so as to multiplex the particular optical signal into the second optical signal.

A coherent optical injection locking (COIL) apparatus generates multiple optical source outputs from a single optical source generated by a parent laser. The COIL apparatus includes a plurality of optical source generators each having a child laser, of lesser performance than the parent laser, that is injection locked to the single optical source. The optical source generators may have one or both of a shared configuration and a cascaded configuration that replicates the single optical source, or a single wavelength of the single optical source when it is a comb source.

The invention discloses a communication quality improving method and device for a satellite laser link and a storage medium, and the method comprises the steps: determining a receiving power deviation value according to receiving power and preset reference receiving power; determining a PID control item for PID control based on the received power deviation value; based on the received power deviation value, determining an input characteristic corresponding to each statistical period; according to the trajectory data corresponding to each statistical time period, determining update parameters for updating a preset weight information determination model, and updating the weight information determination model by using the update parameters; inputting the input features into the updated weight information determination model, and outputting weight information corresponding to the PID control item by using the weight information determination model; and determining a power control signal based on the PID control item and the weight information, and sending the power control signal to the laser transmitter. Therefore, the technical effect that the satellite can keep stable communication quality in a complex space environment is achieved.

The embodiments of the present application provide a signal transmitting method and device, a non-volatile readable storage medium and an electronic device. The method includes: when a first light emitting element has acquired a first electric signal, converting the first electric signal into a first optical signal, inputting the first optical signal into a first light-switching-switch unit, and outputting the first optical signal to an outputting port of the first light-switching-switch unit via a first optical passage, wherein the first electric signal is an electric signal of a first type, and the outputting port is connected to an optical fiber; and when a second light emitting element has acquired a second electric signal, by using the second light emitting element, converting the second electric signal into a second optical signal, inputting the second optical signal into the first light-switching-switch unit, and outputting the second optical signal to the outputting port of the first light-switching-switch unit via a second optical passage in the first light-switching-switch unit, wherein the second electric signal is an electric signal of a second type.

A transceiver including an electronics integrated circuit (EIC), a photonics receiver integrated circuit (photonics RIC), a photonics transmitter integrated circuit (photonics TIC), and an interposer. The photonics RIC and TIC are each electrically coupled with the EIC. The photonics TIC is separate from the photonics RIC and includes at least one optical structure having a thin film lithium-containing (TFLC) electro-optic material. The interposer is coupled with the EIC, the photonics RIC, and the photonics TIC. The interposer is configured to route at least one of electrical or optical signals between at least two of the photonics RIC, the photonics TIC, or the EIC.

The utility model relates to the technical field of visible light communication, and discloses a visible light communication emission head, which comprises a reflection cup, the reflection cup comprises an inner cavity with a gradually increased opening, and the surface of the inner cavity is provided with a reflection layer; the light source is arranged at one end, with a narrower opening, of the inner cavity; the first convex lens is arranged at one end of the reflection cup and covers the light source; the second convex lens is arranged at the other end of the reflection cup; light emitted by the light source sequentially penetrates through the first convex lens, the inner cavity and the second convex lens and then irradiates outwards. The utility model aims to provide the visible light communication transmitting head which is compact in structure, low in cost, long in transmission distance and suitable for long-time operation.

Systems and methods for increasing throughput of a photonic processor by using photonic degrees of freedom (DOF) are provided. The photonic processor includes a multiplexer configured to multiplex, using at least one photonic DOF, multiple encoded optical signals into a multiplexed optical signal. The photonic processor also includes a detector coupled to an output of an optical path including the multiplexer, the detector being configured to generate a first current based on the multiplexed optical signal or a demultiplexed portion of the multiplexed optical signal. The photonic processor further includes a modulator coupled to and output of the detector, the modulator being configured to generate a second current by modulating the first current.

An optical signal generation system for multi-level optical signal generation using binary keying comprises an array of light sources, a control circuit, and an optical coupling mechanism. The system may be operable to configure, using the control circuit, each of the light sources in the array of light sources in a HIGH or LOW state base on a received input signal to generate a plurality of optical output signals. The plurality of optical output signals may be communicated to the optical coupling mechanism and combined into a single optical signal thereby generating a multi-level output signal representative of the received input signal. The multi-level output signal may comprise a Pulse Amplitude Modulated (PAM) equivalent signal. The array of light sources may comprise vertical cavity surface emitting lasers (VCSELs), edge-emitting lasers, or light emitting diodes (LEDs).

The invention relates to a Rydberg atomic communication receiving system and method based on AT split peak value analysis, and belongs to the technical field of quantum communication. The system comprises a detection laser, a coupling laser, an AOM / EOM, a function generator, a high-frequency signal generator, a cesium atom gas chamber, a photoelectric detector, a lock-in amplifier, a data acquisition module and a microwave signal output module. The AOM / EOM modulates the frequency of the detection laser; the microwave signal output module generates an AM modulation microwave signal and transmits the AM modulation microwave signal to the cesium atom gas chamber, so that the target Rydberg state atoms generate an AT splitting effect to calibrate system parameters; the photoelectric detector and the lock-in amplifier obtain a first harmonic component based on the transmission light. During communication, the system is arranged in a microwave electric field received by communication, and the data acquisition and processing module outputs AM modulation microwave signals received by the recovered cesium atom gas chamber based on calibrated system parameters and phase locking. The method solves the problem of signal distortion existing in EIT-AT direct communication transmission and the problem of tedious operation of a heterodyne method.

The invention discloses a chirp spread spectrum photon terahertz communication perception integrated system. The system comprises a coherent light source module used for generating two beams of coherent single-frequency optical carrier signals; the signal modulation module is used for generating a baseband chirp spread spectrum communication sensing integrated signal and modulating the signal to one beam to form a carrier signal; the integrated signal transmitting module is used for taking the other beam of single-frequency optical carrier signal as an optical local oscillator signal, and after the optical local oscillator signal is coupled with the carrier signal, a terahertz communication sensing integrated signal is generated and radiated through optical down-conversion; the communication receiving module is used for performing frequency conversion and demodulation on the received terahertz communication sensing integrated signal and recovering communication information in the signal; and the radar receiving module is used for performing de-chirp and target information estimation on the received terahertz communication sensing integrated signal. According to the system, the advantages of a photon terahertz architecture are fully exerted, and an ultra-wideband chirp spread spectrum integrated signal is generated, so that a communication sensing integrated system with high spread spectrum gain and high energy efficiency is realized.