236 results about "Optical antenna" patented technology

The invention provides an inter-satellite laser communication sunshine avoidance method and system capable of preventing direct sunlight. Belongs to the technical field of space laser communication. The method comprises the following steps of: judging an included angle according to a satellite broadcast sun vector and a current optical axis pointing vector in real time, and if the included angle is less than 3 degrees, autonomously entering a sun avoidance mode; the sun vector is converted into an optical antenna azimuth pitching two-dimensional coordinate system, and the azimuth, the pitching value and the azimuth pitching change direction of the sun vector are determined; and when the included angle between the pointing vector and the sun vector is greater than 3 degrees, the sun avoidance is automatically ended, and the link is reestablished. According to the technical scheme, forecasting is not needed, the included angle is calculated in real time according to the current laser terminal optical axis direction and the satellite broadcast sun vector, if the included angle is smaller than 3 degrees, the solar avoidance mode is automatically entered, manual instruction uploading is not needed, and the method has the advantage that direct sunlight can be effectively avoided in the avoidance process.

The invention relates to the technical field of satellite laser communication, and discloses a laser communication double-end on-orbit calibration system and method, and the system comprises an A end and a B end which are in communication connection and have the same structure; the end B is a second laser communication terminal; the A end is a first laser communication terminal which comprises a main light path, and a transmitting branch, a receiving branch, a tracking branch and a calibration branch which are connected with the main light path; the main light path is composed of an A-end optical antenna, an A-end reflex reflector, an A-end fine tracking galvanometer, an A-end first spectroscope, an A-end second spectroscope, an A-end third spectroscope and an A-end emission galvanometer which are connected in sequence; the transmitting branch is connected with the A-end transmitting galvanometer; the receiving branch is connected with the A-end third spectroscope; the calibration branch is connected with the A-end second spectroscope; and the tracking branch is connected with the A-end first spectroscope. According to the invention, on-orbit receiving and transmitting coaxial calibration is carried out, calibration is carried out without the help of a ground end, and the efficiency is improved.

The invention discloses a wavefront correction system and method for an offshore quantum key distribution system, and relates to the technical field of wavefront correction, and the system comprises a laser, a transmission light path, a redundant light optical antenna, at least three local oscillator light optical antennas, a signal preprocessing module and a wavefront correction module. The laser generates an initial optical signal; the transmission optical path divides the initial optical signal into a local oscillator optical signal and a redundant optical signal, and transmits the local oscillator optical signal, the redundant optical signal and an echo signal; the local oscillator optical antenna transmits a local oscillator optical signal and receives a local oscillator echo signal in a corresponding direction; the redundant light optical antenna transmits a redundant light signal and receives a redundant echo signal in a corresponding direction; the signal preprocessing module preprocesses and corrects the local oscillator echo signal and the redundant echo signal to obtain a target beam signal; and the wavefront correction module calculates a real-time atmospheric turbulence value according to the target beam signal to carry out wavefront correction. The three-dimensional velocity vector component of the carrier can be measured at the same time.

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 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.

A light detection and ranging (LIDAR) transceiver includes optical antenna arrays and an optical switch. Some of the optical antenna arrays include a number of optical antennas and an optical splitter coupled to the optical antennas. The optical splitter may include a number of passive optical splitters. The optical splitter provides a portion of an input signal to the optical antennas. The optical switch is configured to selectively provide the input signal to at least one of the plurality of optical antenna arrays. The optical switch enables addressable field of view scanning by selectively providing the input signal to the plurality of antenna arrays, one array at a time.

The invention provides a space optical communication multi-aperture receiving method based on optical and electrical comprehensive synthesis. The number of optical beam combination sub-apertures is intelligently adjusted by adopting densely-arranged multi-aperture optical antennas so as to ensure that light paths and light signals after beam combination are mutually independent; receiving of optical signals and correction of first-order and second-order Zernike aberration are achieved through the optical antenna array with the total number of sub-apertures determined on the basis of the receiving plane; the optical signals pass through the optical beam splitter, one part of the optical signals are input into the coupling energy photoelectric detector to be converted into voltage or current feedback signals to be input into the control module, and the other part of the optical signals are input into the N * 1 self-adaptive light beam synthesis module; coherent beam combination is carried out on the optical signals through the N * 1 adaptive beam combination module to form M paths of mutually independent optical signals; and carrying out direct detection or coherent detection on the M paths of optical signals, converting the M paths of optical signals into M paths of electric signals, and carrying out electrical signal synthesis on the M paths of electric signals. The communication stability is improved, and the independence of the electrical synthesis signal is ensured.

The invention relates to an optoelectronic emitter comprising a plurality of optical antennas, each comprising: a laterally emitting guiding structure formed from an injection waveguide and from a lateral diffraction grating configured to extract an optical mode in a horizontal plane; and a vertically emitting guiding structure formed from an emission waveguide configured to receive an optical mode extracted by the diffraction grating, and from a vertical diffraction grating configured to extract to free space an optical mode travelling through the emission waveguide.

A photonic integrated circuit (PIC) is disclosed herein. The PIC can include a substrate, a main optical waveguide supported by the substrate. The main optical waveguide can be in communication with an electromagnetic radiation source, and configured to receive electromagnetic radiation from the electromagnetic radiation source. A first branch optical waveguide can be optically coupled to the main optical waveguide at a first location. An optical phased array (OPA) can include plurality of array elements, each having an optical antenna and an optical phase modulator. At least some array elements within a first subset of the plurality of array elements can be optically coupled to the first branch optical waveguide wherein locations of at least some of the plurality of array elements are aperiodic in one or more directions on the substrate.

The present application provides a spaceborne acquisition, tracking and pointing system and a free space optical communication link establishment method. The system comprises: an optical antenna, a laser generation module, a first detector, a light spot position determination module, a first tracking controller, and a first tracking execution mechanism. During terminal link establishment, a first terminal traverses scan points in an initial scan acquisition zone, and emits a first optical beam on the basis of the pointing direction of the currently traversed scan points. When a first feedback optical beam transmitted by a second terminal is received, the first terminal adjusts the boresight direction of the optical antenna. The first terminal emits a second optical beam by means of the optical antenna and receives a second feedback optical beam emitted by the second terminal in response to the second optical beam. When the second feedback optical beam is received, the first terminal emits a third optical beam by means of the optical antenna, so that the second terminal performs tracking processing in response to the third optical beam.

The invention discloses an installation method for mounting a large-aperture microwave antenna on an optical antenna, and relates to the field of spaceflight deep space exploration. The method comprises the following steps: firstly, welding a mounting steel plate in a microwave antenna center body, forming a hole in an antenna panel, then integrally hoisting an optical antenna and an adjusting bracket into the microwave antenna center body through a hoisting device, and mounting the optical antenna and the adjusting bracket on the mounting steel plate; and finally, the angle of the optical antenna is adjusted through the adjusting bracket, and a cable is arranged. The installation mode is simple, the structure is stable, and the electric axis of the microwave antenna and the optical axis of the optical antenna can be adjusted to be consistent. According to the invention, the microwave antenna can be upgraded and reformed, and a composite structure of the optical antenna and the microwave antenna is realized.

The embodiment of the invention provides an optical phased array chip and a laser radar, and the chip comprises a beam splitter which is used for carrying out the beam splitting of an inputted emergent laser beam, and obtaining a plurality of emergent laser sub-beams; the phase shifter is optically connected with the beam splitter and is used for carrying out phase modulation treatment on the emergent laser sub-beams to obtain the emergent laser sub-beams subjected to phase modulation; the optical phased-array antenna array comprises a plurality of optical antennas, and the optical antennas are optically connected with the phase shifter and used for emitting the emergent laser sub-beams subjected to phase modulation to a detection area; and the compensation structure is matched with the optical phased-array antenna array and is used for performing local temperature regulation and control on the optical phased-array antenna array so as to change the effective refractive index of the corresponding optical antennae. According to the application, far-field light spots of the transmitting antenna and the receiving antenna of the laser radar can reach design values, and the accuracy of the laser radar is improved. And the detection performance of the laser radar system is improved.

The present disclosure is directed to imaging LiDARs with separate transmit (Tx) and receive (Rx) optical antennas fed by different optical waveguides. This pair of optical antennas can be activated at the same time through a dual-channel optical switch network, with the Tx antenna connected to a laser source and the Rx antenna connected to a receiver. The Tx and Rx antennas can be positioned adjacent to each other, so they point to approximately the same far-field angle. No optical alignment between the Tx and Rx is necessary. This LiDAR configuration, referred to herein as pseudo-monostatic LiDAR, eliminates spurious reflections and increases the dynamic range of the LiDAR.

The invention discloses an optical phased array main lobe centroid identification method and system based on CBAM-CNN, and the method comprises the following steps: S1, adjusting an optical antenna unit, S2, adjusting the hardware exposure parameters of an image collection unit, S3, converting a gray value image into a binary image, S4, inputting the binary image into a CBAM module-based convolutional neural network, and S5, carrying out the recognition of the main lobe centroid of an optical phased array. S5, judging the position of the mass center of the light spot in the main lobe area through a method, and outputting the coordinate of the mass center of the main lobe area; and S6, judging whether the far-field light spot of the optical phased array exceeds the hardware acquisition view field of the image acquisition unit. According to the invention, the convolutional neural network combines a channel attention mechanism and a space attention mechanism, carries out the accurate image region recognition of an optical phased array main lobe region, an optical phased array side lobe region and a stray light region, converts a multi-light-spot recognition problem into a single-light-spot recognition problem in the optical phased array main lobe region, and achieves the recognition of a single light spot in the optical phased array main lobe region. And the optical phased array main lobe centroid can be accurately identified under the condition of multi-side-lobe interference.

The invention provides a laser communication terminal based on an ultra-compact wave combining laser. The laser communication terminal comprises a wave combining laser module, an optical antenna module, a light splitting module, a beacon receiving module and a signal receiving module. The wave combining laser module is used for combining laser beams with different wavelengths into a main laser beam through a space path. The optical antenna module is used for expanding and collimating the main laser beam, then emitting the main laser beam, and receiving an external incident laser beam. And the light splitting module is used for carrying out polarization state and wavelength separation on the main laser beam and an external incident laser beam, guiding the main laser beam to the optical antenna module, and respectively guiding the external incident laser beam to the beacon receiving module and the signal receiving module. The beacon receiving module is used for acquiring position information, and the signal receiving module is used for acquiring communication information. According to the invention, the laser communication terminal structure with integrated emission and reception, miniaturization and high precision is realized, and the laser communication terminal structure is suitable for free space optical communication and other application scenes.

The invention relates to an optical signal receiving and transmitting device, in particular to an optical one-dimensional phased-array antenna based on an integrated photon technology and a signal receiving and transmitting method and a parameter calculation method thereof, and aims to solve the problem that adjacent waveguides of an existing optical one-dimensional phased-array antenna have serious signal crosstalk. The waveguide array comprises two auxiliary waveguide arrays which are respectively arranged at the upper end and the lower end of a linear waveguide array, wherein each auxiliary waveguide array comprises K auxiliary waveguides; each auxiliary waveguide comprises a second end, and the second end of each auxiliary waveguide is connected with the inner end of the corresponding optical antenna; and each auxiliary waveguide is used for receiving and transmitting the optical signal diffused into the auxiliary waveguide due to coupling in the corresponding linear waveguide to the corresponding optical antenna, or diffusing part of the optical signal received by the optical antenna into the corresponding linear waveguide through coupling. According to the invention, signal crosstalk between antennas is thoroughly eliminated, and the antenna units are identical, so that perfect interference can be achieved.

The invention discloses an inter-satellite alignment and fine-following aiming optical system which comprises a reflective off-axis optical antenna and a fast reflecting mirror. Wherein the reflective off-axis optical antenna and the fast reflecting mirror are sequentially arranged along the direction of an optical axis, and the fast reflecting mirror and the optical axis are placed at an included angle of 45 degrees. The device has the advantages of being small in size, light in weight, high in chain building efficiency and convenient to install and adjust.

An integrated configurable photodetector with an ultra-high circular polarization extinction ratio and a preparation method therefor are provided. The photodetector includes a metal reflective layer, a dielectric layer, an electrode layer, and a two-dimensional material layer. The electrode layer includes symmetrically arranged Z-shaped metallic optical antenna arrays which are respectively integrated with a source electrode and a drain electrode and have opposite chirality. The photodetector operates at zero bias state, and a photo-response is photovoltaic effect, hot electron injection, photo-thermoelectric effect and so on induced by a Schottky junction composed of the source electrode, the drain electrode and the two-dimensional material. By adjusting the distribution of the incident light in the source and drain electrode regions, under specific Circularly polarized light, photocurrents of equal magnitude but opposite directions cancel each other out, resulting in a net output of zero and significantly reducing noise.

The invention discloses a target distance and speed measurement system and method based on a direct detection laser radar compatible with software radio, and belongs to the technical field of target distance and speed measurement. According to the invention, the problems of low utilization rate of echo light power, complex structure, crosstalk of microwave and optical frequency signals, and low precision of distance measurement and speed measurement in the prior art are solved. According to the improved direct detection laser radar structure compatible with the software radio provided by the invention, a radio frequency signal can be demodulated from echo signal light of the laser radar only by a single square-rate photoelectric detector, so that the structure is simpler; and the frequencies for transmitting and receiving the microwave radio-frequency signals are different, so that the microwave crosstalk of the transmitting end and the receiving end is avoided. Due to the fact that the receiving and transmitting separated optical antenna is adopted, crosstalk of optical frequency signals can be eliminated. Moreover, the method effectively improves the measurement precision of the target distance and speed. The method can be applied to target distance and speed measurement.

A LIDAR transceiver includes a source input, coherent cells, and an optical switch. The optical switch is configured to switchably couple the source input to the coherent cells. At least one of the coherent cells includes an input port, an optical antenna, and a splitter. The input port is coupled to the optical switch and the splitter is coupled between the input port and the optical antenna. The splitter is configured to split a received portion of a laser signal into a local oscillator signal and a transmit signal, where the transmit signal is emitted through the optical antenna. A reflection of the transmit signal is received through the optical antenna as a reflected signal, where the splitter is further configured to output a return signal that is a portion of the reflected signal.

The invention relates to an on-orbit self-calibration system and method suitable for a satellite-borne laser communication system, and the method comprises the steps: an emission collimator emits a laser beam, and the laser beam sequentially passes through a fast reflector, a PBS mirror and an optical antenna and then is emitted to an external calibration reflector; the external calibration reflector reflects a laser beam, the laser beam sequentially passes through the optical antenna and the PBS mirror and then enters the optical fiber through the coupling collimator, and the processor receives and reports a light energy value; traversing the rotation angle of the fast reflector, and fitting to obtain a light energy value-angle curve; according to a curve result, obtaining a fast reflector angle corresponding to the highest point of the curve, namely a fast reflector zero angle; controlling the focusing motor coupled with the collimator to move back and forth until the rise time of the curve is minimum, and recording the rise time as the zero movement amount of the focusing motor; and controlling the fast reflecting mirror to be at a fast reflecting mirror zero-position angle and the movement amount of the focusing motor to be zero-position movement amount, thereby completing self-calibration. According to the invention, on-orbit transmitting and receiving optical axis consistency calibration is realized, and the efficiency and accuracy of on-orbit self-calibration are effectively improved.

The invention provides a multiband optical phased array and a preparation method, and relates to the technical field of photoelectricity. The multiband optical phased array comprises a substrate; the array waveguide units are arranged on the substrate and used for carrying out phase modulation on input optical signals of at least one wavelength, the number of the array waveguide units is the same as that of the input optical signals of the at least one wavelength, and the optical signals of the at least one wavelength are correspondingly input into the array waveguide units; and the optical antenna is vertically connected with the array waveguide unit, is separated from the substrate, and is used for transmitting the received phase-modulated optical signal of at least one wavelength.

The laser radar optical chip supports multiple working modes, which can form a multi-light path system according to requirements, for example, when the laser radar optical chip contains two input / output couplers and two sets of optical antenna arrays, a double-light-path system is obtained, which can realize field of view splicing and increase the field of view range of the laser radar when all serving as a transmitting end; when all serving as a receiving end, the receiving area is doubled, and the receiving capacity is stronger; when one set serves as a transmitting end and the other set serves as a receiving end, the system complexity can be greatly simplified, and the laser radar can be miniaturized.

Single-mode and multi-mode coaxial transceiver kilometer-level wireless optical communication devices belong to the field of wireless optical communication technology. Existing technologies fail to take into account both communication quality and communication distance under the premise of coaxial transceiver. The present invention is characterized in that a triple-clad optical fiber is arranged on the optical path between the optical antenna and the laser diode and photodiode; the triple-clad optical fiber is composed of a core, an inner cladding, a middle cladding and an outer cladding from the inside to the outside, and the middle cladding is doped with a laser working material and can generate laser light with the same wavelength as the communication light; at one end of the triple-clad optical fiber, the center is the core incident end face a, and the other two end faces are the inner cladding output end face b' and the middle cladding incident end face c, each made by the tapering technology; the end face of the other end of the triple-clad optical fiber is located at the back focus of the optical antenna; the laser diode light outlet and the core incident end face a are connected by a single-mode optical fiber; the inner cladding output end face b' and the photodiode light inlet are connected by a multi-mode optical fiber.

The invention discloses a receiving and transmitting common-optical-axis antenna system based on a liquid crystal phased array. The receiving and transmitting common-optical-axis antenna system comprises an optical antenna subsystem, a signal transmitting subsystem and a signal receiving subsystem. The optical antenna subsystem comprises an antenna lens group, a liquid crystal optical phased array device, and a transmitting channel and a receiving channel which share the same optical axis; the antenna lens group is arranged above the liquid crystal optical phased array device and is used for transmitting the transmitted signal light and reflecting the received signal light; the transmitting channel is arranged in the central area of the liquid crystal optical phased array device, and the receiving channel is coaxially arranged in the peripheral area of the liquid crystal optical phased array device; the liquid crystal optical phased array device dynamically changes the polarization states of the emitted light beam and the received light beam through the LCPG controller so as to realize light path separation; the signal emission subsystem is used for emitting and processing emission signal light, and the emission signal light enters the optical antenna subsystem to be processed and then emits an optical signal; and the signal receiving subsystem is used for receiving the received signal light obtained from the optical antenna subsystem and processing the received signal light to obtain a corresponding detection signal.

The invention relates to a coherent LIDAR system comprising an optical antenna array. A light detection and ranging (LIDAR) transceiver includes an optical antenna array and an optical switch. Some of the optical antenna arrays include a plurality of optical antennas and an optical splitter coupled to the optical antennas. The optical splitter may include a plurality of passive optical splitters. The optical splitter provides a portion of the input signal to the optical antenna. The optical switch is configured to selectively provide an input signal to at least one of the plurality of optical antenna arrays. The optical switch enables addressable field-of-view scanning by selectively providing input signals to a plurality of antenna arrays one array at a time.

This application provides an optical emission apparatus, an optical communication system, and an optical communication method. Light beams of N optical emission units in the optical emission apparatus are adjusted, so that an optical power of entering an optical receiving apparatus is maximized, and impact of a speckle caused by turbulence is minimized, thereby improving receiving efficiency of an optical antenna. The optical emission apparatus includes a first optical splitter and N optical emission units, where N is an integer greater than 1; the first optical splitter is configured to transmit received same signal light to the N optical emission units; and the N optical emission units are configured to output the signal light from the first optical splitter, to obtain light beams distributed based on a preset proportion.

To provide an optical antenna capable of improving accuracy of chiral molecule identification.SOLUTION: An optical antenna includes: a plurality of structures respectively including a continuous hole for irradiating or emitting light in a predetermined polarization state, surrounded by a twisted structure; and a nano gap disposed between the plurality of structures and communicating with a continuous hole.SELECTED DRAWING: Figure 1

The invention discloses a high-speed polarization spectrum detection system, which is used for simultaneously realizing spectrum measurement and polarization measurement on visible light and near-infrared spectrum bands of a target in a target collision process so as to carry out damage evaluation on the target. The optical antenna collects a visible spectrum optical signal and a near-infrared spectrum optical signal of a target, and the visible spectrum optical signal and the near-infrared spectrum optical signal are respectively divided into two paths and respectively enter the spectrum detection module and the polarization detection module; the spectrum detection module is used for performing spectrum measurement on the incident light beams to obtain visible spectrum section spectrum information and near-infrared spectrum section spectrum information; the polarization detection module carries out polarization state modulation and polarization measurement on an incident light beam to obtain visible spectrum polarization information and near-infrared spectrum polarization information. And the servo turntable receives target azimuth information and controls the detection system to point to a target area.

This invention discloses a double-sideband swept-frequency laser ranging and velocimetry device and method based on phase unwrapping. The device includes a single-frequency laser, a double-sideband modulator, an amplifier, a first coupler, a first demultiplexer, a second coupler, a second demultiplexer, a third coupler, a circulator, an optical antenna, a first photodetector, a second photodetector, a synchronous acquisition card, and a phase unwrapping and range / velocimetry demodulation module. This invention can obtain the distance values ​​corresponding to all sampling times within one sweep cycle, achieving an order-of-magnitude increase in system measurement rate; simultaneously, it can adapt to dynamic targets with arbitrary motion forms, without requiring a constant target velocity.