209 results about "Intensity modulation" patented technology

The invention discloses an optical computing array based on micro-ring resonators without a free spectral range, which comprises an on-chip wavelength division multiplexing beam splitting array, an on-chip intensity modulation array, two groups of on-chip wavelength division multiplexing beam combining arrays and an on-chip balance detector, the on-chip wavelength division multiplexing beam splitting array and the on-chip wavelength division multiplexing beam combining array are respectively composed of a group of multiple FSR-free MRRs which share the same bus optical waveguide, each resonator corresponds to an independent wavelength channel, and the on-chip intensity modulator array is composed of a plurality of groups of on-chip MZI modulator arrays. According to the optical calculation array implementation method, independent control and coding calculation of different wavelength channels in a broadband wavelength range are realized by utilizing the single harmonic peak characteristic of the FSR-free MRR array and the wide-spectrum intensity modulation function of the MZI unit, the limitation of a free spectrum range on the optical calculation wavelength channel is eliminated, the higher wavelength parallelism is achieved, and the optical calculation array implementation method has the advantages of being simple in structure and convenient to implement. And therefore, the calculation scale is remarkably improved.

The present disclosure relates to the technical field of optical computing, and particularly relates to an intelligent optical computing chip cluster architecture and system. The architecture comprises: a plurality of optical computing chips, and optical path channels are established between the plurality of optical computing chips by using spatial phase adjustment to modulate light beams; and high-speed optical communication and optical diffraction network computing are performed between the plurality of optical computing chips by performing time-domain intensity modulation on the optical path channels. The present disclosure adopting the above scheme can realize the interconnection computing of optical computing chips in the spatial dimension, and does not rely on electricity for information transmission.

The invention discloses an optical fiber laser phased array self-adaptive optical system based on an integrated optical chip. The optical fiber laser phased array self-adaptive optical system comprises a self-adaptive optical fiber coupler array, the integrated optical chip, an optical fiber splitter, a photoelectric detector, a control platform and a high-voltage amplifier. The integrated optical chip comprises an optical fiber coupling interface, a waveguide, a phase shifter, a Mach-Zehnder intensity modulator and the like. The adaptive optical fiber coupler array couples incident light to the optical fiber array, and corrects tilt aberration based on an optimization control algorithm to realize efficient adaptive coupling of spatial light to optical fibers; the sub-beams enter an integrated optical chip through an optical fiber coupling interface, phase and intensity modulation is performed on the sub-beams in the optical chip based on an optimization control algorithm, and co-phase synthesis output of the beams is realized; the output light is divided into two paths by the optical fiber splitter, one path is connected with the photoelectric detector for control, and the other path is connected with the application end. Based on light path reciprocity, the system has a transmitting or receiving and transmitting integrated function, and has important application prospects in the fields of space optical communication, laser energy transfer and the like.

The invention belongs to the related technical field of sensors, and provides a multi-parameter integrated acquisition optical fiber sensor and a monitoring system thereof in order to solve the problem that high-precision monitoring of a static signal and a dynamic signal is difficult to consider by an existing sensor at the same time, a sensing cavity is sequentially divided into a static signal sensing area and a dynamic signal sensing area in the axial direction; the static signal sensing area adopts a multi-core fiber, fiber gratings are respectively engraved on the multi-core fiber, and the wavelength demodulation of the static signal is realized through the central wavelength drift distance of the fiber gratings; the dynamic signal sensing area is provided with a dynamic signal sensing unit, the dynamic signal sensing unit comprises F-P air microcavities formed between the dynamic signal sensing unit and the end faces of all fiber cores of the multi-core optical fiber, and intensity demodulation of dynamic signals is achieved through cavity length changes of the F-P air microcavities. According to the invention, a wavelength modulation and intensity modulation parallel composite demodulation mechanism is adopted, and decoupling acquisition of static strain, temperature and dynamic vibration is realized in a single sensor.

The invention relates to the technical field of wafer detection, in particular to a wafer surface defect detection system and method.The system comprises an imaging module, the imaging module comprises at least two sets of imaging channels, each imaging channel comprises an imaging camera for collecting light signals and converting the light signals into image signals, and a light modulation assembly is arranged in each imaging channel; the light modulation assembly performs polarization modulation and light intensity modulation on emergent light reflected or scattered by the surface of the wafer; the polarization control module adjusts the rotation angle of the light modulation assembly in each imaging channel; the signal processing module carries out differential operation on different image signals, light rays emitted by the multiple groups of imaging channels are set with different polarization parameters and light intensity parameters through the light modulation assembly, multiple groups of image signals are obtained, and an imaging image about scattered light of the same detection area is formed. The imaging image comprises an image with the defect signal as weak as possible and an image with the defect signal as strong as possible, and the imaging image with the defect signal enhanced can be obtained through differential operation.

The invention provides a photoacoustic sensor and a sensing system for trace C4F7N gas detection, and relates to the technical field of C4F7N gas detection. The system comprises a broadband light source used for generating wide-spectrum infrared light; the modulation unit is used for carrying out intensity modulation on the wide-spectrum infrared light; the photoacoustic cell is used for receiving the modulated light beam and exciting C4F7N gas to generate a photoacoustic signal; the sound detector is used for detecting a photoacoustic signal; the signal processing unit is used for processing the photoacoustic signal to obtain the C4F7N gas concentration; the broadband light source is a blackbody radiation source; the photoacoustic cell is a spherical Helmholtz resonant cavity, is of a differential structure and comprises two spherical resonant cavities; and the two sound detectors are symmetrically arranged on the cavity walls of the two spherical resonant cavities. The black-body radiation source is used as a broadband light source, and the differential spherical Helmholtz photoacoustic cell is coupled with the black-body radiation source, so that the system cost and the integration complexity are remarkably reduced on the premise of keeping the advantage of high sensitivity.

The measurement of overlay using a microscope-based sensor is described. This provides, among several advantages, the ability to measure alignment and overlay in a single system. The signal from the sensor is an intensity-modulated fringe pattern (e.g., an interference pattern). The sensor is configured to generate an intensity-modulated fringe pattern based on diffracted radiation received from a first metronome mark on a first layer of the pattern substrate and a second metronome mark on a second layer of the pattern substrate. The intensity-modulated fringe pattern is filtered for the expected fringe period. The overlay value is determined using the amplitude, phase, and / or other parameters of the fringe in the filtered fringe pattern.

The invention provides a photoacoustic gas measurement method and a photoacoustic gas measurement system based on a series sensibilization technology, and relates to the technical field of optical gas sensing. The first-stage light absorption enhancement structure is used for carrying out maximum photoacoustic conversion on target gas to generate an initial photoacoustic pressure signal, the second-stage acoustic resonance structure is introduced to carry out resonance amplification on sound waves with specific frequency, a tandem cascade sensibilization framework of light absorption enhancement and acoustic resonance amplification is constructed, and through mutual verification analysis, the sensitivity of the target gas is improved. Calculating coherence outside preset noise analysis frequency band data, identifying and inhibiting common-mode noise interference caused by environment vibration and the like, generating feedback control parameters while calculating final gas concentration, adaptively adjusting intensity modulation frequency and wavelength modulation depth, and realizing high-precision and high-precision measurement. The measurement reliability, the dynamic range and the adaptive capacity of the system under complex working conditions are improved, and multiplier-level breakthrough of the sensitivity of the system and collaborative optimization of the performance are achieved.

The invention belongs to the technical field of optical calculation, and particularly relates to an intensity-phase mixed silicon-based photon modulator. According to the hybrid silicon-based photon modulator, a PIN micro heater formed by ion implantation is integrated on two arms of a Mach-Zehnder interferometer or a micro-ring resonator, and a phase change material and a protective layer are deposited in a window above the micro heater; electric pulses are applied to metal electrodes at the two ends of the micro heater to drive local reversible crystalline and amorphous transformation of the phase change material, and phase modulation of passing optical signals is achieved; meanwhile, constant voltage signals are applied to the two ends of the PIN micro heater, and intensity modulation is generated on passing optical signals through the carrier absorption effect. The two modulation modes are mutually independent and do not interfere with each other, and two groups of independently variable weight values can be stored in the device. The hybrid silicon-based photon modulator can be used in a large photon neural network, high-speed and high-parallelism convolution operation is carried out, and the overall end-to-end insertion loss of a chip is reduced.

The invention discloses a device and a method for testing frequency domain characteristics of a high-speed optoelectronic device. The device comprises a laser, a sawtooth wave generator, a signal source, an acousto-optic modulator, an electro-optic intensity modulator, a low-frequency photoelectric detector, a frequency spectrograph and a computer. An electro-optic intensity modulator is driven through a sawtooth wave modulation technology, and frequency-shifted and non-frequency-shifted optical carriers and frequency-shifted and non-frequency-shifted radio frequency optical sidebands are synchronously generated in an optical path in combination with radio frequency signal modulation. And after the signal is subjected to beat frequency processing by the photoelectric detector, the power of the frequency shift signal in different working states is measured by the frequency spectrograph, so that the frequency domain characteristic parameters of the photoelectric device to be measured are obtained. The method is based on sawtooth wave modulation and an amplitude comparison method, frequency domain response characteristics of a single / dual-drive electro-optic intensity modulator, dual-parallel electro-optic intensity modulation and a photoelectric detector can be accurately represented, the test method is simple, and dependence on a high-frequency test instrument is effectively reduced.

An optical computing system includes: an intensity modulation device group including at least two intensity modulation devices, each of which includes modulation cells, wherein each of the modulation cells of each of the intensity modulation devices carries out intensity modulation with respect to carrier light in accordance with one of signals to generate a signal light beam, and each of the signals corresponds to each of the intensity modulation devices; and a light diffraction element including diffraction cells having respective thicknesses or refractive indices set independently of each other, wherein each of the diffraction cells receives the signal light beam from each of the modulation cells of each of the intensity modulation devices corresponding to each of the diffraction cells, and by causing signal light beams to have respective different optical path lengths to the light diffraction element, the signal light beams have respective different phases.

A waveguide is coupled at both ends to a microring (MRR) modulator in order to form a Mach-Zehnder interferometer out of the resulting unit. The coupled waveguide can be modulated independently from the MRR modulator itself with either an in-resonance photoconductive heater or a geometrically suitable PN junction. During modulation with an applied voltage to the coupler, an independent modulation can be applied to the MRR in order to compensate for wavelength shifting. Ideal lengths for the coupler are identified, as well as a spiral configuration to reduce the coupler's footprint on a photonic integrated circuit. The resulting device has reduced cross-talk between channels of a cascaded MRR system. A second coupler can be coupled to each MRR symmetrically so as to reduce insertion losses, allowing for an increased weight range at the drop and through ports.

This invention discloses a wavelength locking system for a silicon oxide microring resonator, comprising a photoelectric conversion module, a feedback control module, a radio frequency drive module, an interdigital transducer, a zinc oxide film, a lock-in amplifier module, two analog-to-digital conversion modules, and a digital-to-analog conversion module. The radio frequency drive module generates an alternating electrical signal and applies it to the interdigital transducer, causing the zinc oxide film to vibrate mechanically and generate surface acoustic waves that propagate to the vicinity of the silicon oxide microring resonator, inducing mechanical stress and strain, changing the refractive index distribution of the silicon oxide microring resonator, and modulating the frequency, phase, and intensity of the internal optical signal. The feedback control module adjusts the thermal power of the microring heater based on the voltage signals output by the lock-in amplifier module and the photoelectric conversion module, thereby adjusting the resonant wavelength of the silicon oxide microring resonator and locking the wavelength of the optical signal output by the silicon oxide microring resonator to the target wavelength. The advantage is that it can accurately lock the wavelength of the silicon oxide microring resonator, resulting in a high wavelength locking effect.

This semiconductor light-receiving element (100) is provided with: an n-type InP substrate (1); an n-type semiconductor layer (2) formed on the n-type InP substrate (1); a multiplication layer (3) which is formed on the n-type semiconductor layer (2), has a layer thickness of 40 nm or more and 170 nm or less, and comprises an InAlAs digital alloy structure in which InAs layers and AlAs layers are alternately laminated; a p-type electric field relaxation layer (4) formed on the multiplication layer (3) and comprising InP or InAlAs; and an InGaAs light absorption layer (5) formed on the p-type electric field relaxation layer (4).

This optical modulator-integrated semiconductor laser (500) is provided with a semiconductor laser unit (101) formed on a semi-insulating substrate (1), a first connection waveguide unit (102), a first EA modulator unit (103), a second connection waveguide unit (104), a second EA modulator unit (105), and a first EA modulator n-type electrode (31) provided in the first EA modulator unit (103) and a second EA modulator unit (105) provided in the second EA modulator unit (105). And a first common electrode (45) electrically connected to the second EA modulator p-type electrode (42).

A driving device includes a pulse intensity modulation module, a pulse width modulation module, a pulse density modulation module, and a driving module. The pulse intensity modulation module receives an image processing signal related to a pixel and generates a pulse intensity according to the image processing signal. The pulse width modulation module receives the image processing signal and generates a pulse width according to the image processing signal. The pulse density modulation module receives the image processing signal and generates a pulse density according to the image processing signal. The driving module receives the pulse intensity, the pulse width, and the pulse density and generates a driving signal to the pixel according to the pulse intensity, the pulse width, and the pulse density.

To provide a surface position detector for obtaining the position information of a surface to be inspected along an axis crossing the surface to be inspected.SOLUTION: A position detection device 100 includes a light transmission part TS having a light transmission optical system which irradiates a plurality of detection lights intensity-modulated in a first direction on a surface to be detected WA on the surface to be detected WA in an obliquely incident manner from a direction having a directional component in the first direction, a first light receiving optical system 20, 21 which forms a first conjugate surface optically conjugate with the surface to be detected, an aperture member SL which is disposed on the first conjugate surface and includes a plurality of apertures arranged side by side in a second direction corresponding to the first direction, a second light receiving optical system 22, 23 which forms a second conjugate surface optically conjugate with the first conjugate surface, and a light detection part 28a, 28b having a light receiving surface arranged on the second conjugate surface.SELECTED DRAWING: Figure 1

The invention discloses an angle continuously adjustable super-resolution microscope illumination device and method. The device comprises a light beam coupling assembly; an LED-DMD excitation light path and a digital micromirror array perform intensity modulation on Kohler illumination light according to a loaded intensity distribution reference pattern, a first light beam is reflected, and the first light beam is projected to a sample plane through a light beam coupling assembly and a conjugate light path in sequence; an SLM-Laser excitation / light control light path, a spatial light modulator performs phase modulation on parallel light according to a loaded phase distribution reference pattern to generate a second light beam, and the second light beam is coupled with the first light beam through a light beam coupling assembly and then is projected to a sample plane; the excitation mode switching module is used for switching a conjugate surface to realize TIRF illumination or spot scanning excitation; the control system realizes seamless switching between a preset light control imaging mode and a real-time light control imaging mode. The problems that a traditional super-resolution microscope is single in function, high in phototoxicity, poor in adaptability and the like are solved, and a more powerful imaging platform can be provided for biomedical research.

The present application discloses a fiber optic sensor and a measurement method, apparatus, and storage medium. By performing, based on the microwave signal, intensity modulation on the optical signal, then inputting the modulated optical signal into the fiber optic containing the weak reflection grating array, a reflected signal is obtained. Thereafter by performing dispersion compensation on the amplified partial reflected signal, and based on the dispersion-compensated reflected signal and the non-dispersion-compensated reflected signal, the change amounts respectively corresponding to positions in the fiber optic containing the weak reflection grating array are determined.

The invention discloses a low-chirp push-pull resonant cavity modulator with a pre-calibratable phase and a method. The two coupling annular waveguides serve as micro-ring resonators, are located between the two single-mode coupling straight waveguides, are arranged in parallel and are respectively coupled with the two single-mode coupling straight waveguides, the micro-ring resonators of the two coupling annular waveguides are not mutually coupled, and the metal electrode is composed of an electrode located in the ring and an electrode located outside the ring. The coupling annular waveguide is made of ferroelectric materials, regulation and pre-calibration of the light refractive index are achieved by controlling the domain direction of the ferroelectric materials, loading of the voltage of the micro-ring resonator is achieved, and the resonant wavelength of the micro-ring resonator is calibrated and adjusted. The low-chirp electro-optic intensity modulation device can be used for realizing low-chirp electro-optic intensity modulation, has an efficient pre-calibration function, has no drift problem after calibration, can keep stable, can repeatedly erase and set a calibrated working point, and has the advantages of simple structure, no need of direct current bias, convenience in design, convenience in expansion, large process tolerance and the like.

This invention discloses an illumination intensity modulation method for disk scanning confocal imaging, comprising the following steps: S1: Before formal imaging, a pre-imaging is performed using weak, uniform illumination; S2: The fluorescence intensity of different regions in the pre-imaging is evaluated and analyzed, and the evaluation results are obtained; S3: Based on the evaluation results, the parameter settings of the intensity modulation mechanism are adjusted to achieve different illumination in different regions of the sample; S4: The scanning points traverse the imaging area to obtain a complete image on the camera. This invention can dynamically adjust the illumination intensity of local regions in the scanning imaging as needed, and can be used to reduce photobleaching in local regions, increase the dynamic range of imaging, and enhance the signal-to-noise ratio of local regions.

The application discloses an image encryption and decryption method based on spatial deep learning, which comprises the following steps: taking an obtained image to be encrypted as a plaintext image and taking a generated intensity modulation matrix as a key; constructing a diffraction neural network, wherein the diffraction neural network comprises a DMD, an SLM and a CCD camera, loading the key on the DMD, and obtaining a reconstructed image through the diffraction neural network; constructing a loss function based on the difference between the reconstructed image corresponding to a correct key and the plaintext image, and the difference between the reconstructed image corresponding to an incorrect key and an image obtained by reversing the plaintext image in black and white; using a gradient descent algorithm to modulate the phase of a light field by the SLM based on the loss function to obtain an optimized phase modulation matrix; taking the optimized phase modulation matrix as a ciphertext to complete image encryption; and in the decryption process, input light is sequentially passed through the DMD loaded with the key, the modulated SLM and the CCD camera to obtain a final reconstructed image, thereby completing image decryption. The method can easily replace the plaintext and the key, and has high encryption capacity and high key sensitivity.

The invention discloses a beauty mirror system based on multi-mode programmable light energy and a working method thereof, and belongs to the technical field of intelligent beauty instruments. According to the system, the beauty mirror is innovatively used as an intelligent control center and is connected with a detachable light energy output module through a magnetic attraction modular interface. The system is characterized in that multiple light energy output schemes for different skin care scenes are pre-stored in the system, after a user selects the schemes, a core control unit drives a light energy output module to generate a composite light energy beam subjected to strict time sequence and intensity modulation, and the light energy beam is shaped through a special optical assembly to enhance the skin tissue penetrability of the light energy beam. Therefore, a multi-dimensional beautifying effect from surface nursing to deep repairing is realized. By means of collaborative design of software and hardware, the problems that existing equipment is single in function, insufficient in targeting and poor in user compliance are solved, and the device is particularly suitable for fading deep skin problems such as nasolabial folds and striae gravidarum.

To provide a simple and highly accurate photocurrent sensor.SOLUTION: A photocurrent sensor comprises: a polarized light separation portion provided between a light source and an optical fiber; a reflection portion provided at the other end of the optical fiber to reflect measurement light transmitted through the polarized light separation portion and incident on the optical fiber and including an optical rotator for optically rotating incident polarized light by approximately 45 degrees; a sensor fiber provided between the polarized light separation portion and the reflection portion; a detector that converts the measurement light subjected to intensity modulation by reciprocating in the sensor fiber and passing through the polarized light separation portion again into an electric signal.SELECTED DRAWING: Figure 1

The embodiment of the invention provides a quantum state coding transmitting terminal and electronic equipment. The quantum state coding transmitting terminal comprises a light emitting device and a light processing structure, the light emitting device is used for emitting a first light source and a second light source, and the light intensity ratio of the first light source to the second light source is a random preset ratio; the light processing structure is used for receiving the first light source and the second light source, performing related processing on the first light source and the second light source and outputting a target light signal; wherein the correlation processing comprises intensity modulation, phase shift and beam combination, and the preset proportion and the correlation processing enable the target optical signals to meet the condition that the light intensities of the target optical signals obtained under any preset proportion are the same.

The application discloses a Fourier photoacoustic gas detection device and method, and belongs to the technical field of gas detection. In view of the limited anti-interference ability of a sound signal and the low detection sensitivity of an existing Fourier transform photoacoustic spectrum, a Fourier photoacoustic gas detection device is designed. A supercontinuum broadband light source is used as an excitation light source of a photoacoustic effect, the broadband light source is subjected to unified intensity modulation through an intensity modulation assembly and phase modulation through an interferometer assembly. After the broadband interference light emitted through double modulation interacts with gas molecules, wide-spectrum mixed sound waves are generated, a quartz tuning fork sound measurement assembly extracts resonance components and converts the resonance components into electrical signals. The generated electrical signals are sequentially subjected to processing through a signal amplification assembly, a phase-sensitive demodulation assembly and a Fourier transform assembly, and the processed signals are used for component discrimination and concentration inversion of a target gas.

The invention discloses a rapid and efficient laser fuze signal high repetition frequency and high speed modulation system based on a DMD, and belongs to the field of laser fuze signal modulation. The modulation system is composed of a coupling optical system, a DMD modulation optical system and an emission optical system. The emission optical system is used for receiving the pulse laser beam output by the DMD modulation optical system, shaping the pulse laser beam and then projecting the pulse laser beam to a target area at a preset angle so as to illuminate a fuse; the divergence angle of the emergent laser beam is adjusted through the focusing mechanism, so that the illumination area is changed; the DMD modulation optical system is used for receiving the coupling optical laser beams output by the coupling optical system and outputting the coupling optical laser beams after spatial intensity modulation on the DMD micromirror array; in an echo receiving mode, laser echoes returned by a target are imaged on the surface of the DMD micromirror array; and the coupling optical system is used for coupling the laser beam output by the optical fiber laser source to a free space and adjusting the size and the divergence angle of the laser beam. The device is used for laser fuze signal modulation.

The application discloses a kind of intensity modulation polarization encoding quantum key distribution systems based on sagnac ring, including communication end Bob and communication end Alice, the communication end Bob and communication end Alice are connected by optical fiber channel;The laser in the communication end Bob generates optical signal into optical isolator and exports linearly polarized signal parallel to cat eye direction into first polarization maintaining beam splitter;First polarization maintaining beam splitter exports linearly polarized signal parallel to cat eye direction into communication end Alice;Communication end Alice divides the linearly polarized signal parallel to cat eye direction into first linearly polarized signal and second linearly polarized signal with equal intensity and carries out intensity modulation, and finally polarized state signal is output into communication end Bob by the beam combination superposition of third polarization beam splitter after being combined, first single-photon detector to fourth single-photon detector in communication end Bob carries out measurement.The polarization encoding and quantum state modulation of signal are realized by one intensity modulator in the application, and the equipment cost of QKD is reduced.

an optical intensity modulation device (100) comprising: an optical modulator (102) operative to modulate a continuous wave optical carrier signal at a carrier wavelength to generate one or more sidebands on the optical carrier signal; a radio frequency (RF) signal generator (104) operative to provide an RF drive signal to the optical modulator; a first optical waveguide grating (108) having a center reflection wavelength corresponding to the sidebands; and an optical circulator (106) configured to direct the optical carrier signal and the one or more sidebands into the first optical waveguide grating and to direct a reflected optical signal from the first optical waveguide grating towards an output to form an output optical signal, wherein the RF signal generator is operative to switch the drive signal on and off to form an intensity modulated output optical signal.