469 results about "Optical antenna" patented technology

A hybrid cable comprising an optical fiber, an intermediate layer surrounding the optical fiber, and an electrically insulating jacket surrounding the intermediate layer. The intermediate layers include a collection of metallic strands. The hybrid cable may be used to establish simultaneous electrical and fiber-optic connection between two communication devices. Thus, the two communication devices may simultaneously transfer optical signals through the optical fiber and perform any of various electrical functions (power transfer, eye safety control) through the metallic strands. For example, an optical transceiver may couple to an optical antenna unit through the hybrid cable. Such an optical transceiver may serve as part of a point-to-point link, a point-to-multipoint link, and/or, a link between a primary transceiver unit and an optical router.

The present invention discloses a solar cell comprising a nanostructure array capable of accepting energy and producing electricity. In an embodiment, the solar cell comprises an at least one optical antenna having a geometric morphology capable of accepting energy. In addition, the cell comprises a rectifier having the optical antenna at a first end and engaging a substrate at a second end wherein the rectifier comprises the optical antenna engaged to a rectifying material (such as, a semiconductor). In addition, an embodiment of the solar cell comprises a metal layer wherein the metal layer surrounds a length of the rectifier, wherein the optical antenna accepts energy and converts the energy from AC to DC along the rectifier. Further, the invention provides various methods of efficiently and reliably producing such solar cells.

The invention provides a laser imaging radar device and a distance measurement method thereof. The laser imaging radar device and the distance measurement method thereof aims at the problem that an existing distance range gate laser imaging radar is low in distance resolution. The laser imaging radar device comprises a laser device, a laser modulation unit, an optical antenna unit, a detecting unit, a data processing unit and an image processing unit, wherein the detecting unit is composed of a counter, a gate controller and an array detector, and the data processing unit is composed of an accumulator and a correlator. According to the distance measurement method, an information loading process is carried out on laser signals with constant amplitude by using a phase code pulse amplitude modulation mode. The laser imaging radar device and the distance measurement method thereof have the advantages that the equipment and the method combine the advantages of long detecting distances of the distance ranging gate layer imaging radar and the advantage of high distance measurement resolution of the pulse phase coding mode, and meanwhile the detect of low distance measurement resolution of the distance ranging gate layer imaging radar and the detect of low imaging speed of the pulse phase coding mode are avoided.

The invention discloses a laser link communication-measurement composite system. Through adoption of the laser link communication-measurement composite system, the payload weight, size and power consumption can be lowered. The laser link communication-measurement composite system is implemented by the following technical scheme: an optical antenna transmits a comprehensive optical signal to a rapid reflecting mirror through an eye lens at a transmitting end; reflected light splits a light beam of the comprehensive optical signal into two paths through a beam splitter; one path is transmitted into another beam splitter through the beam splitter to transmit the light beam into a coarse tracking module in order to extract a target position coarse miss distance, and a control voltage is applied to a two-dimensional turntable according to an embedded control algorithm; the other path of comprehensive optical signal is introduced into the field range of a fine tracking module through the beam splitter, and transmitted into the fine tracking module to extract a target position fine miss distance, the overall offset of fine field light spots is controlled, the light spots are introduced into the center of a fine tracking field to obtain target angle information, and the extracted target position fine miss distance is transmitted into a ground/satellite platform comprehensive electronic management and processing module to finish target capture and an aiming function and establish a communication link.

A multifunctional dielectric gradient metasurface optical device has a layer of nanoscale dielectric gradient metasurface optical antenna elements deposited on a substrate layer, arranged with spatially varying orientations, shapes, or sizes in the plane of the device such that the optical device has a spatially varying optical phase response capable of optical wavefront shaping. The spatially varying optical phase response is a spatial interleaving of multiple distinct phase profiles corresponding to multiple optical sub-elements, thereby providing multifunctional wavefront shaping in the single optical element.

The invention relates to a full duplex cat eye reverse modulation recovery free space laser communication system, belongs to the technical field of wireless communication, and solves the problem of low transmission rate of the system in the prior art. A laser I and a transmitting data source are both connected with a DPSK (differential phase shift keying) modulator, the DPSK modulator and a laser II are both connected with an optical fiber amplifier I, two communication lights are amplified and then connected with a port a of a fiber circulator, a port b of the fiber circulator is connected with an optical antenna, a port c of the fiber circulator is connected with a photoelectric detector I, the photoelectric detector I is connected with a DPSK modulator I, a cat eye optical system is coaxially arranged with the optical antenna, an optical filtering beam splitter is arranged between the cat eye optical system and a laser collimating lens and forms an angle of 45 degrees with the cat eye optical system, the laser collimating lens is connected with a port d of a fiber circulator II, a port e of the fiber circulator II, an optical fiber amplifier II and the DPSK modulator II are sequentially connected, the other end of the DPSK modulator is connected with a port f of the fiber circulator II, and a photoelectric detector II is connected with the DPSK modulator.

Bi-directional laser communications system comprising a first transceiver and a second transceiver for establishing two optical channels there between. The first transceiver comprises a first transmitter with a pulsed high-power laser source for transmitting a pulsed beacon laser signal into a first of said optical channels. The second transceiver comprises a receiver with an optical antenna for receiving said pulsed beacon laser signal, said second transceiver and/or a receiving optic of said second transceiver being adjustable so that it can be adjusted with respect to said pulsed beacon laser signal. The second transceiver further comprises a second transmitter with a laser for transmitting a high energy laser signal into a second of said optical channels, and means for a separation of said first optical channel and said second optical channel. These means prevent the high energy laser signals from being transmitted into said second optical channel whenever said pulsed beacon laser signal is expected to arrive through said first optical channel.

The invention provides a tunable nanometer antenna and a preparation method thereof. The tunable nanometer antenna comprises three layers which comprise an upper layer metal structure, a middle layer single-layer grapheme and bottom substrate materials; the upper layer metal structure is a bowknot structure; the bowknot structure is formed by two isosceles trapezoids and a square. The preparation method of the tunable nanometer antenna comprises the following steps of covering the layer of single-layer grapheme on a silicon dioxide substrate through a chemical vapor deposition method; coating resist coating in a rotary mode on the single-layer grapheme; achieving structural corrosion and developing through the electron beam lithography technology; achieving evaporation of a golden layer through the vacuum electron beam evaporation technology; obtaining a final nanometer optical antenna through a lift-off process. The tunable nanometer antenna has the advantages of being small in size due to the fact that the thickness of a metamaterial structure is in the dozens of nanometer level and beneficial to application in integration optics; being high in signal intensity due to the fact that magnetic field enhance through the nanometer optical antenna can achieve more than 20000 times under illumination of incident light under specific frequency; being obvious in modulation effect.

The invention discloses a 2 mu m all-fiber coherent laser Doppler wind finding radar system, which consists of a 2 mu m off-axis Cassegrain optical antenna system, a 2 mu m laser beam splitting system, a 2 mu m seed implantation laser amplifier, a 2 mu m monitoring detector system, and a 2 mu m balanced heterodyne detection system. The system overcomes the defect of ambient interference existing in a free space optical path, overcomes the influence of shot noise on heterodyne reception signal-to-noise ratio, and solves the problems of all fiber and miniaturization of the 2 mu m all-fiber coherent laser Doppler wind finding radar system, so that the 2 mu m all-fiber coherent laser Doppler wind finding radar system has a more compact structure. In addition, the system has the characteristics of safe laser for human eye, optical path connection by adopting flexible optical fiber devices, high operability and stability, low cost, good real time, long effectively measured distance, high measurement accuracy (speed measurement and distance measurement) and the like, and has high practical value in the field of coherent laser Doppler wind finding radar.

The invention discloses a laser wireless energy transfer communication and tracking integrating system and method. The system comprises a laser wireless transmission active end and a laser wireless transmission passive end, wherein the laser wireless transmission active end and the laser wireless transmission passive end are arranged on two spacecrafts respectively. The laser wireless transmission active end comprises an energy laser (1), an emitting end control machine (2), an emitting optical antenna (3), an emitting end two-dimensional rotary table (4) and a laser communicator. The laser wireless transmission passive end comprises a passive end control machine (5), a receiving optical antenna (6), a passive end two-dimensional rotary table (7), an energy management system (8) and a laser communicator (9). By means of the same system, laser communication and laser energy transmission are achieved at the same time, performance of the system is improved, the design of the system is simplified, and a solving method is provided for ontrack application of module spacecrafts.

This invention belongs to a laser radar domain, which relates to a continuous wave frequency modulation cohere laser radar which is on the basis of optical fiber laser device. Optical fiber laser device is used as light source, of which launching wnd links optical fiber coupler. Optical fiber coupler divides energy of light into two parts. Moiety is used as characteristics light, which can be directly inputted in an input end of secondary optical fiber coupler, the other part is inputted in expanding bunch lens device; after expanding bunch lens compresses laser emission angle, direct surveyed area by 2-dimensional scanner; echo-signal is feed-through one end of transmission optical fiber through optical antenna by 2-dimensional scanner, the other end of transmission optical fiber contacts secondary optical fiber coupler by optical fiber amplifier. After echo-signal and characteristics light are combined and interfered to mix frequency by optical fiber coupler, enter monitor component element. Monitor component element can transform and magnify signal photoelectricity, output, post it in computer by collecting card, carry out data processing. This invention has features of small volume, light quality, high integrated degree, good stability, intelligentification and modular.

The invention relates to a data transmission system for an underwater acoustic network, which comprises a plurality of independent underwater nodes, wherein each underwater node is equivalently connected with at least the other underwater node. The data transmission system also comprises a transmitting optical antenna, a receiving optical antenna, a light source, an optical modulator, an optical receiver, an underwater acoustic transducer/receiving transducer, a digital signal processor and a positioning module, wherein the positioning module is provided with a rotating device and used for completing the alignment between the light source and the optical receiver; the transmitting optical antenna, the light source, the optical modulator and the digital signal processor are in signal connection with each other in turn; the receiving optical antenna, the optical receiver and the digital signal processor are in signal connection with each other in turn; the digital signal processor is also in signal connection with the positioning module and the underwater acoustic transducer/receiving transducer respectively; and the light source is a blue-green laser source. The invention also relates to a data transmission method for the underwater acoustic network. The invention reduces the collision probability of data in the transmission process, improves the success rate of the construction of a communication link, saves the network bandwidth, and improves the network throughout.

A terahertz detector based on an optical antenna comprises optical antennas made of polycrystalline silicon material layers and a transistor or a field-effect tube. The optical antennas are respectively arranged at the source electrode end and the drain electrode end of the transistor, the distance of the edges of the antennas and the edge of the grid electrode of the transistor is 100-500 nm, and the optical antennas and the source end, the drain end and the grid end of the transistor are isolated by filling oxides in a standard technology. The optical antennas and the grid electrode of the transistor are made of the same layer of polycrystalline silicon materials, however, doping is independently achieved through other technologies, and the thickness is 100-300 nm. The optical antennas are of a dipole antennal structure and a bow-tie antenna structure, and the doping density of the polycrystalline silicon materials is 1017-1020. According to the working scheme of the terahertz detector of the optical antenna, DC bias voltages are added on the grid electrode of the transistor, the source electrode is connected to the ground, the drain electrode floats in the air, and signal voltages are output from the drain electrode.

An apparatus for outputting directional light includes a light-emitting structure including a light-emitting layer that emits light, and an optical antenna layer disposed on the light-emitting structure, wherein the optical antenna layer includes a light feeder configured to resonate light output from the light-emitting layer and a light reflector configure to reflect light output from the light feeder to have directivity. The light feeder and the light reflector are formed on a surface of the optical antenna layer.

The invention provides a device and a method for automatically matching laser radar receiving and transmitting optical axes. The device comprises an emergent light path, a receiving light path and a data acquisition and control portion, an emergent system comprises a laser, a beam expanding system, a plurality of reflecting mirrors and lenses, laser light is emitted to air through the beam expanding system, the lenses, the reflecting mirrors and an optical antenna, a receiving system comprises a telescope, echo signals sequentially pass an optical fiber, the lenses, a light filter and a photoelectric detection element, the photoelectric detection element is arranged at an input end of a data acquisition system, and an output end of a control system controls the optical antenna with a high-accuracy servo motor through a motor driving controller. The method automatically traces the echo signals by the aid of a program design two-dimensional spiral scanning algorithm, uniaxial scanning and matrix scanning are performed to obtain the best emitting antenna position, so that an emitting antenna points to and receives collimation of the optical axis of the telescope, operators no longer need rich experience, and the method is simple and convenient to operate and high in feasibility.

In the prior art, a satellite optical communication terminal is calibrated in an on-orbit manner through a laser communication ground station. The position of the receiving optical axis can only be calibrated at night; the transmitting-receiving coaxiality of the terminal itself cannot be corrected; the terminal cannot be caught; the communication state is checked; The invention provides a satellite optical communication terminal in-orbit calibration and transceiving coaxiality correction device and method. The device comprises an external calibration transmitting branch, The system comprisesa calibration reflector, a coarse pointing mechanism, an optical antenna, a fine pointing mechanism, a beam splitter I, a beam splitter II, a beam splitter III, an advanced aiming mechanism I, a signal internal calibration transmitting branch, an advanced aiming mechanism II, a beacon internal calibration transmitting branch, a communication receiving branch, a communication detector, a capturingand receiving branch, a capturing and tracking detector, a communication transceiver and a terminal controller. The device and the method can meet the requirement of on-orbit self-calibration of the satellite laser communication terminal, and the coaxiality of the correction transmit-receive optical axis can reach the micro-radian magnitude.

This invention relates to a free space optical communication system among multiple mobile platforms, which sets at least one primary mobile station in a working region installed with a full-way transceiver of a full-way optical antenna or a full-way emitter and a full-way receiver and sets several slave mobile platforms installed with a directional transceiver or a directional emitter and a directional receiver to realize full-way emission and reception to the slave mobile platforms from the primary platform and directional emission and reception to the primary platform from the slave platforms, and the full-way transceiver means an emitter and a receiver share a full-way optical antenna, which realizes free space optical communication among multiple mobile platforms with traditional directional emitters and receivers.

The invention relates to a wireless communication device based on a distributed optical resonant cavity. The device comprises a master and a slave. The master comprises a master optical antenna, a master main control module and a master modulation module. The slave comprises a slave optical antenna, a slave main control module, a slave optical detection module and a slave demodulation module. Themaster optical antenna and the slave optical antenna form an optical resonant cavity. A resonant beam is formed in the optical resonant cavity. The master main control module selects the optical pathof the master optical antenna, and at the same time the master main control module sends the information to the master modulation module. The master modulation module controls the master optical antenna to modulate the resonant beam. The slave optical detection module detects transmission light led out from the slave optical antenna and sends the detection information to the slave demodulation module for demodulation. The slave demodulation module sends the demodulation information to the slave main control module. Communication from the master and the slave is completed. Compared with the prior art, the wireless communication device provided by the invention has the advantages of no alignment, high communication capacity and minimal interference.