65 results about "Optical antenna" patented technology

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 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.

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 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.

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.

The invention relates to the technical field of laser communication, particularly provides a laser communication terminal with a variable beam divergence angle, and aims to solve the problems of low link establishment efficiency, high cost and poor adaptability caused by dependence on beacon light or a small beam divergence angle of an existing laser communication terminal. The terminal comprises an optical antenna, a fine tracking fast reflecting mirror, a divergence angle adjusting assembly, a signal light emitting assembly, a receiving aiming link and the like. The signal light emitting assembly outputs different mode field signal light, after the signal light is shaped by the collimating lens group, the beam divergence angle is continuously adjusted by the divergence angle adjusting assembly, and then the signal light is emitted to the outside through a preset light path. And the receiving aiming link realizes signal receiving and light spot positioning feedback through light splitting and branching, and is matched with a fine tracking fast reflecting mirror to correct deviation and a solar optical filter to improve the strong light adaptability. Beacon light is not needed, the beam divergence angle can be flexibly switched to complete coarse and fine alignment, the structure is simplified, the power consumption cost is reduced, the link building efficiency, the aiming precision and the environmental adaptability are greatly improved, and the method is suitable for multi-scene laser communication of satellites, emergencies and the like.

An optical power and data delivery system includes an optical base station and an autonomous wireless hotspot device. The optical base station includes routers, a media converter device, a optical data transceiver configured to transmit the received data laser light beam; one or more power laser devices configured to transmit a power laser light beam, a beam combining device to generate and transmit a combined power and data laser light beam through a first optical antenna. The autonomous wireless hotspot device includes a second optical antenna configured to receive the combined data and power laser light beam, an optical dividing device, an optical data transceiver, a media converter device and wireless communication transceivers to transmit wireless data signals and one or more laser power converters to receive the power laser light beam and to convert the power laser light beam into electrical energy.

Provided is an optical system for laser communication. The optical system comprises: a transmissive optical antenna system, the transmissive optical antenna system being located upstream from a dual optical wedge system in a laser optical path of the optical system, and comprises a first objective lens group and a second objective lens group that are each composed of a plurality of lenses. An object plane of the second objective lens group is a focal plane of the first objective lens group, the first objective lens group is configured to focus an incident laser beam to the focal plane of the first objective lens group, and the second objective lens group is configured to reduce laser beams from a same point on the focal plane of the first objective lens group and emit same in parallel. The dual optical wedge system comprises two optical wedges arranged opposite one another, the dual optical wedge system is configured to deflect a parallel laser beam emitted from the transmissive optical antenna system into the field-of-view range of a tracking branch, and the dual-optical wedge system is driven by a driving device. In this way, an optical antenna having a large field-of-view range and a tracking device having a small volume are provided.

This application discloses a spatial light modulator, driving method, free-space optical antenna, device, and system, relating to the field of free-space optical communication technology. The spatial light modulator includes a first substrate, a first electrode, a liquid crystal layer, a second electrode, and a second substrate. The first electrode is a planar electrode, and the second electrode includes multiple sub-electrodes spaced apart from each other. The multiple sub-electrodes are arranged sequentially from the inside to the outside around a center. When different driving voltages are applied to the first electrode and the sub-electrodes respectively, the liquid crystal material in the liquid crystal layer flips under the action of the electric field, resulting in different equivalent dielectric constants of the liquid crystal material. This allows the spatial light modulator to adjust the intensity and phase of the incident light beam to modulate different types of light beams, achieving adaptive switching of light beam types. In particular, it can achieve adaptive switching of different types of light beams in a sharp beam, improving anti-turbulence capability and enhancing the stability of the communication link.

The invention provides an optical antenna structure with a wide temperature adaptation range, which comprises a plurality of optical lenses, each optical lens is sleeved with a gasket, the optical lenses provided with the gaskets are fixed in a lens barrel through a pressing ring, a space ring for separating the optical lenses is further arranged in the lens barrel, and a solar optical filter is arranged at the front end of the lens barrel; the optical lens is made of optical glass with low heat sensitivity, the lens cone is made of an aluminum alloy material, the space ring is made of an invar steel material, the gasket is a graphene gasket subjected to anti-oxidation treatment, and the solar optical filter is made of microcrystalline glass and is coated with an aluminum film. The athermalization design is carried out by selecting an optical structure material with a low thermal expansion coefficient, so that the optical antenna structure can keep stable performance in a larger temperature range, and the possibility of mechanical deformation or rigid body displacement of the optical antenna structure in a space extreme temperature environment is further reduced.

An optical power and data delivery system includes an optical base station and an autonomous wireless hotspot device. The optical base station includes routers, a media converter device, a optical data transceiver configured to transmit the received data laser light beam; one or more power laser devices configured to transmit a power laser light beam, a beam combining device to generate and transmit a combined power and data laser light beam through a first optical antenna. The autonomous wireless hotspot device includes a second optical antenna configured to receive the combined data and power laser light beam, an optical dividing device, an optical data transceiver, a media converter device and wireless communication transceivers to transmit wireless data signals and one or more laser power converters to receive the power laser light beam and to convert the power laser light beam into electrical energy.

An optical antenna (300; 400; 71) and a communication terminal (70'). The optical antenna (300; 400; 71) comprises a first light source assembly (10) and an optical element (20); the first light source assembly (10) is used for emitting a first light beam towards the optical element (20); the optical element (20) comprises a reflection region used for reflecting the first light beam; the reflection region covers a central region of a first light spot formed by the first light beam on the optical element (20); the optical element (20) further comprises a transmission region used for transmitting a second light beam; and the second light beam is an external light beam. Alternatively, the optical antenna (300; 400; 71) further comprises a second light source assembly (40); the second light beam is a light beam emitted by the second light source assembly (40) towards the optical element (20); the energy distribution of the second light beam is different from that of the first light beam; the transmission region covers a central region of a second light spot formed by the second light beam on the optical element (20); and the optical element (20) is used for combining the first light beam and the second light beam by means of the reflection region and the transmission region. In this way, two light beams are combined by means of energy distribution, and light beam processing can be implemented without depending on the wavelength or polarization characteristics of a light source itself.

This invention provides an energy adaptive adjustment device and method for underwater wireless optical communication, relating to the field of underwater wireless optical communication. The device includes: an adaptive adjustment module, a signal processing module, an optical antenna, a tunable optical attenuator, and a beam splitter. The tunable optical attenuator adjusts the light intensity energy of the optical signal according to the feedback signal from the adaptive adjustment module. The beam splitter splits the optical signal output from the tunable optical attenuator into two paths, one transmitted to the adaptive adjustment module and the other to the signal processing module. The signal processing module generates an energy calibration result and sends it to the adaptive adjustment module, and receives the optical signal from the beam splitter, processes it, and outputs it. The adaptive adjustment module receives the signals from the beam splitter and the signal processing module, processes them, and feeds them back to the tunable optical attenuator. This invention solves the problem that the signal energy detected by the receiving end of the device cannot be adaptively adjusted, improving the practicality and robustness of the communication device.

The invention discloses a metasurface folded antenna device suitable for space optical communication and a space optical communication system, and belongs to the technical field of optical antennas and micro-nano photonic devices. The antenna device comprises a gold reflecting layer, a transmission-type dispersion metasurface and two reflecting-type focusing metasurfaces, wherein the transmission-type dispersion metasurface and the two reflecting-type focusing metasurfaces are integrated on silicon dioxide. Wherein the transmission-type dispersion metasurface adopts a periodically arranged diffraction grating structure, so that angle deflection of incident light can be realized; the reflective focusing metasurface is designed based on binary plane phase. Incident light is deflected by the transmission-type dispersion metasurface, is reflected after reaching the gold layer, then sequentially passes through the two reflection-type focusing metasurfaces, and is finally converged and imaged at the position of an image plane. By means of the structure, the problems that a traditional optical antenna is large in size and heavy in weight are effectively solved, and harsh requirements of a space optical communication system for light weight and small size of devices are better met.

The invention provides a radar system for measuring wind and distance and a wind and distance measuring method, and relates to the technical field of laser radars. The system comprises a dual-band laser light source module used for outputting a first laser signal of a first wavelength and two paths of second laser signals of a second wavelength, which are emitted by the same laser and are separated; the optical antenna module is used for respectively transmitting the first laser signal and one path of second laser signal as anemometry laser, transmitting the other path of second laser signal as ranging laser, and receiving two kinds of anemometry echoes and ranging echoes; the photoelectric conversion module is used for performing heterodyne detection on the two wind measurement echoes to obtain a first wind measurement electric signal and a second wind measurement electric signal, and determining a distance measurement electric signal according to the distance measurement echoes; the identification module is used for identifying the wind speed according to the first and second wind measurement electric signals; and recognizing the clearance distance according to the ranging electric signal. According to the invention, continuity and reliability of wind measurement and distance measurement can be guaranteed, and multi-meteorological-scene monitoring requirements of wind power equipment are met.

The invention relates to a laser radar networking system. The system comprises a laser and an optical antenna network (7), the laser is formed by sequentially connecting a signal generation module (1), a pre-amplification module (2), a hybrid beam combination main amplification module (3), a transmitting and receiving module (4), a coherent detection module (5) and a signal processing module (6), and the optical antenna network (7) comprises a plurality of optical antennas; the hybrid beam combining main amplification module (3) comprises a pump laser (3-1), a hollow-core solid hybrid beam combiner (3-2) and a hollow-core optical fiber (3-3), and the transmitting and receiving module (4) comprises a hollow-core solid hybrid circulator (4-1) and a hollow-core optical fiber optical switch (4-2).

The invention discloses a laser tracking and pointing control method and device based on an acousto-optic deflector, and the device comprises a pulse laser source, an optical antenna module, an acousto-optic deflection module and a synchronous control module, and comprises the steps: generating narrow-linewidth pulse laser, and splitting the narrow-linewidth pulse laser into intrinsic light and detection light; the synchronous controller applies driving signals with horizontal and vertical deflection frequencies to the acousto-optic deflection module, and after direction driving is stable, the optical antenna module triggers and emits the probe light; after the reflected light reflected by the target object is received, coherent detection is carried out on the reflected light and the intrinsic light, a beat frequency electric signal is generated, the beat frequency electric signal is processed, and existence of the target object is determined; recording deflection frequency (fx1, fy1) when the target object is hit, taking the deflection frequency as reference frequency, and converting the deflection frequency into local scanning taking the reference frequency as the center of a scanning view field; and the reference frequency is tracked and corrected by repeated tracking and aiming.

An optical device and a free-space optical communication system, relating to the field of optical communications. The optical device comprises a transmitting module, a receiving module, an optical splitting module, and an optical antenna module. The optical splitting module is separately connected to the transmitting module, the receiving module, and the optical antenna module. The optical splitting module is used for, on the basis of a splitting function for optical signals of different wavelengths, outputting a single-mode optical signal outputted by the transmitting module to the optical antenna module, and for outputting a multi-mode optical signal received by the optical antenna module to the receiving module. The wavelength of the single-mode optical signal is different from the wavelength of the multi-mode optical signal. The optical antenna module transmits the single-mode optical signal and receives the multi-mode optical signal. The receiving module processes the multi-mode optical signal. On the basis of the structure, the transmit-receive coaxiality of the optical device is more easily resistant to adverse environmental influences due to the optical splitting module being built inside the optical device, thereby enhancing the stability of the transmit-receive coaxiality.

The invention discloses an unobstructed secondary reflection laser antenna with a real exit pupil. The unobstructed secondary reflection laser antenna comprises a protection window, a reflective off-axis secondary reflection optical antenna and a fast reflection mirror, wherein the parallel light reaches the reflective off-axis secondary reflective optical antenna through the protection window, small-aperture parallel light is obtained through the reflective off-axis secondary reflective optical antenna, and the small-aperture parallel light is reflected out through the fast reflective mirror. The method has the advantages of being high in link building efficiency, high in reliability and convenient to install and adjust.

The application provides a space laser communication terminal and a communication method thereof, and relates to the technical field of space information, the terminal comprising a double-wedge structure coaxially arranged at the beam-expanding end of an optical antenna, the double-wedge structure comprising a wedge group and a rotating device, the wedge group being composed of two wedges arranged coaxially and oppositely, and the rotating device being used for rotating the wedges. Through the terminal, real-time tracking of a target satellite can be realized, and a signal transmission task can be efficiently completed, and the overall structure is simple and compact, the optical path requirement is short, and the occupied space is small.

This invention relates to the field of lidar technology and provides an optical chip and a lidar system. The optical chip includes an input coupler, a beam splitter, a phase modulator, and multiple optical antenna arrays connected in sequence, wherein each optical antenna array includes multiple optical antennas; at least one optical antenna serves as a transmitting antenna, and at least one optical antenna serves as a receiving antenna. The optical chip further includes a thermal correction structure for heating the optical antennas to change the beam deflection angle of the optical antenna array in the wavelength direction, thereby aligning the emitted light spot of at least one transmitting antenna with the received field of view of at least one receiving antenna; wherein the temperature gradient within the optical antenna corresponding to at least one thermal correction structure is less than a preset value. The optical chip and lidar system provided by this application can ensure that different regions of the same optical antenna have the same temperature or that the temperature difference is within a preset range.

An optical system includes an optical antenna configured to receive and / or transmit laser beams through a first aperture, a gimbal-mounted deformable mirror (GDM) configurable to correct aberrations of a received laser beam, a power selector configurable to split the received laser beam into a first light beam and a second light beam, a wavefront sensor configured to measure a wavefront of the first light beam, a collimator configured to couple the second light beam into an optical fiber, and a controller configured to control the GDM for laser beam tracking and for correcting the aberrations of the received laser beam based on the wavefront of the first light beam measured by the wavefront sensor. The GDM is configurable to scan, within a field of regard (FOR), a beacon beam to be transmitted for laser beam tracking; or scan within the FOR to acquire a beacon beam transmitted by a terminal.

The present application relates to the technical field of free-space optical communications. Disclosed are a spatial light modulator, a driving method, a free-space optical antenna, a device and a system. The spatial light modulator comprises a first substrate, a first electrode, a liquid crystal layer, a second electrode and a second substrate; the first electrode is a planar electrode, and the second electrode comprises a plurality of sub-electrodes spaced apart from each other, the plurality of sub-electrodes being successively spaced apart from each other from inside to outside around one center. When different driving voltages are respectively applied to the first electrode and the sub-electrodes, a liquid crystal material in the liquid crystal layer flips under the action of an electric field, such that the liquid crystal material has different equivalent dielectric constants, and the spatial light modulator can adjust the light intensity and phase of an incident light beam, so as to modulate different types of light beams, thereby realizing adaptive switching of light beam types, especially realizing adaptive switching of different types of light beams in pin beams, improving the anti-turbulence capability, and improving the stability of communication links.

The application discloses a typical laser communication system Kude optical path installation and adjustment method based on a fast reflecting mirror, and comprises the following steps: reflecting a parallel light pipe light beam to a parallel light pipe camera center position through a reference mirror; a fiber collimator emits laser, an optical antenna azimuth direction is rotated through a control coarse tracking turntable, and a transmission light spot position information is acquired through the parallel light pipe camera; the fast reflecting mirror position is adjusted, a Kude optical path pointing rotation error reduction trend is determined, and an accurate reference is provided for Kude optical path installation and adjustment. The method has the characteristics of controllability and rapidity of the fast reflecting mirror in the typical laser communication system, avoids the shortcomings of uncertain direction and low controllability caused by manual control during the existing Kude optical path installation and adjustment, effectively improves the Kude optical path installation and adjustment effect and efficiency, and can be widely applied to the typical laser communication system.

The present invention relates to a single photon light source capable of generating single photons with a high repetition rate and a high collection efficiency by positioning an emitter in a nanogap of a nano-antenna including a metal nanoparticle and a metal layer, and by controlling Purcell enhancement in the nanogap. The single photon light source of the present invention is easy to manufacture with low manufacturing costs due to its simple structure and has excellent light collection efficiency by emitting single photons vertically upward through an optical antenna structure of a nano-antenna. In addition, single photons may be generated by applying various emitters to a nano-antenna, a high production yield is obtained due to the wide bandwidth, and operation may be possible at room temperature at various wavelengths.

The utility model discloses a wind measurement radar device based on a silicon-based photoelectronic technology, and relates to the field of laser wind measurement. The wind measurement radar device comprises a receiving and transmitting integrated module based on the silicon-based photoelectronic technology, an acousto-optic frequency shifter, an optical amplifier, a circulator, a wavelength division multiplexer and an optical antenna, wherein the acousto-optic frequency shifter is connected between the receiving and transmitting integrated module and the optical amplifier; the optical amplifier is connected to the circulator, the circulator is in dual-phase connection with the wavelength division multiplexer, the circulator is connected to the optical transceiving integrated module, and the optical transceiving integrated module comprises an adjustable narrow linewidth laser based on the silicon-based photoelectron technology, a balance detector, a frequency mixer, an optical splitter, an optical fiber array, a sealing tube and the like. According to the utility model, the tunable narrow linewidth laser adopting the silicon optical external cavity scheme is matched with the pure solid state scheme of the wavelength division multiplexer, so that the process of switching an optical antenna by using an optical switch in the measurement process is directly avoided; line width performance indexes of the laser can be far better than that of a traditional adjustable laser of an InP-based platform through design and process optimization.

To provide an FMCW _ LIDAR transceiver mounted on an optical integrated circuit.SOLUTION: A light detection and ranging (LIDAR) transceiver for in-vehicle applications, the LIDAR transceiver comprising a light source configured to emit a light beam, a plurality of coherent pixels each comprising an optical antenna, and an optical switch network configured to switchably couple the light beam between a plurality of optical paths, wherein: An optical switch network, wherein each optical path of the plurality of optical paths corresponds to a respective coherent pixel of the plurality of coherent pixels, wherein a transmitted signal is emitted via an optical antenna of a respective coherent pixel of the plurality of coherent pixels and a reflection of the transmitted signal is received as a reflected signal via the optical antenna of the respective coherent pixel.SELECTED DRAWING: Figure 5a

This application discloses an optical antenna and a communication terminal. The optical antenna includes a first light source assembly and an optical element. The first light source assembly is used to emit a first light beam toward the optical element. The optical element includes a reflective region for reflecting the first light beam, and the reflective region covers the central region of the first light spot formed by the first light beam on the optical element. The optical element also includes a transmission region for transmitting a second light beam, which is an external light beam. Alternatively, the optical antenna also includes a second light source assembly, and the second light beam is a light beam emitted by the second light source assembly toward the optical element. The energy distribution of the second light beam is different from that of the first light beam. The transmission region covers the central region of the second light spot formed by the second light beam on the optical element. The optical element is used to combine the first light beam and the second light beam through the reflective region and the transmission region. In this way, the two light beams are combined by means of energy distribution without relying on the wavelength or polarization characteristics of the light source itself.

The invention discloses an ultra-diffraction light-limiting storage read-write device based on an optical antenna and a preparation method, an optical antenna array of the device comprises a plurality of optical antenna structures distributed in an array, and each optical antenna structure comprises a pointed structure and a metal film layer wrapping the pointed structure. The metal film layers of any two adjacent optical antenna structures in each row are electrically connected, the metal film layers of any two adjacent optical antenna structures in each column are electrically connected, and the metal films wrapping the rows and the columns of the array are led out to electrodes at the edge of the optical antenna array through the electric connection. The input module is used for inputting driving control signals; according to the optical antenna, incident light super-diffraction limit focusing is achieved through strong electron accumulation of the optical antenna, the resolution ratio and the storage capacity of a conventional optical storage device are remarkably improved, the optical antenna has high imaging light wave collection efficiency, and the appearance design of the optical antenna gives consideration to ultralow fly height lt; and the requirement of 10nm is met.

The invention discloses a digital intermediate-frequency coherent Doppler wind-finding radar system, and relates to the field of wind-finding radars, in particular to a compact laser wind-finding radar system based on optical fiber optics design, which comprises a transmitting unit, a digital intermediate-frequency coherent receiving module and an upper computer unit, the digital intermediate-frequency coherent receiving module receives backward echo signals scattered by aerosol particles in the atmosphere in a digital intermediate-frequency coherent receiving mode and performs preliminary signal conditioning, and the upper computer unit accurately extracts Doppler frequency shift information by applying a digital signal processing algorithm, so that the wind speed and the wind direction are calculated; and the system is responsible for coordinating the work of each unit and realizing the automatic operation of the system. By optimizing the optical module, the digital intermediate frequency coherent receiving mode and the signal processing algorithm, the wind measurement precision and reliability are improved, the system complexity is reduced, and the wide application prospect is achieved.