OPTISCHE STRAHLUNGSVORRICHTUNGEN

Verfahren und Vorrichtung zum Ausrichten von Teleskopen in optischen Verbindungen in freien Raum

Drahtloser Kommunikationsempfänger mit einem Konzentrator mit Totalreflexion

Improvements in or relating to Optical Frequency Communication Systems.

... 1,170,187. Photo-electric communication systems. WESTERN ELECTRIC CO. Inc. Aug. 27, 1968 [Aug. 28, 1967], No.40924/68. Heading G1A. The effects of phase and amplitude distortions on an amplitude modulated optical carrier beam are compensated by transmitting an unmodulated pilot beam of different frequency with the carrier, amplifying the pilot beam at the receiver and detecting the carrier and the amplified pilot beam. As described the pilot and the carrier differ by an intermediate frequency and are heterodyned together at the receiver photo-multiplier. The means for amplifying the pilot beam comprises one or more lasers tuned to the pilot frequency. The beams may be transmitted through the atmosphere or through redirector lenses in a pipe.

Receiving information

Optical radiation devices

OPTICAL RECEIVER

OPTICAL FREE PROPAGATION TRANSMISSION SYSTEM

PROCEDURE AND DEVICE FOR THE LINE-FREE OPTICAL TRANSMISSION USING INCOHERENT LIGHT

PROCEDURE FOR THE OPTICAL TRANSMISSION OF DIGITAL SIGNALS

Estimation of spatial profile of environment

Disclosed herein is a system and method for facilitating estimation of a spatial profile of an environment based on a light detection and ranging (LiDAR) based technique. By repurposing the optical energy for communications needs, the present disclosure facilitates spatial profile estimation by optical means while facilitating free-space optical communication.

Optical communications by frequency content of femtosecond laser pulses

PROCESS FOR INCREASING THE ILLUMINATION LEVEL PRODUCED BY A LASER BEAM

Précis de la divulgation : Procédé pour augmenter l'éclairement produit par un faisceau laser sur une cible, consistant à réfléchir ce faisceau sur un miroir déformable comprenant plusieurs éléments piézo-électriques. On augmente successivement la tension de polarisation de chacun des éléments d'une tension continue prédéterminée, cette augmentation n'étant maintenue que si elle correspond à une augmentation de l'intensité lumineuse diffusée par la cible. Application à la focalisation sur une antenne de l'énergie d'un faisceau laser transmettant des informations.

TELESCOPE FOR A FREE-SPACE WIRELESS OPTICAL COMMUNICATION SYSTEM

A free-space wireless optical communication system is disclosed that utilizes a telescope design having aspherical mirrors, such as a Richey- Chetrien (RC) telescope. RC telescopes are characterized.by a concave primary mirror and a convex secondary mirror each having a hyperbolic shape. The mirror configuration of the present invention allows the primary and secondary mirrors to be positioned closer together than conventional designs, allowing for a very compact system. The disclosed mirrors can be thin and lightweight, allowing for a lightweight telescope unit. The mirror configuration of the present invention provides a larger focal plane, allowing for automatic alignment between a transmitter and receiver with a stationary or fixed mirror design, further contributing to a lower fabrication cost, and can be fabricated with large diameters, allowing the transmission of high beam intensities at eye-safe levels since the energy is spread over a large area. A number of fabrication techniques ...

PROCESS FOR INCREASING THE ILLUMINATION LEVEL PRODUCED BY A LASER BEAM

INTEGRATED COMMERCIAL COMMUNICATIONS NETWORK USING RADIO FREQUENCY AND FREE SPACE OPTICAL DATA COMMUNICATION

A stabilized ultra-high bandwidth capacity transceiver system that combines an E- band (71-76 GHz, 81-86 GHz ) millimeter wave RF transceiver with an eye-safe adaptive optics Free Space Optical (FSO) transceiver as a combined apparatus for simultaneous point- to-point commercial communications. The apparatus has a high degree of assured carrier availability under stressing environmental conditions. The apparatus establishes and maintains pointing and stabilization of mmW RF and FSO optical beams between adjacent line of sight apparatuses. The apparatus can rapidly acquire and reacquire the FSO optical carrier link in the event the optical carrier link is impaired due to adverse weather.

[...][...][...] PAR UN [...][...] LASER SUR [...] L' [...][...].

OPTICAL RADIO BEAM PLANT TO THE DATA COMMUNICATION.

Optical directional transmission device is suitable for data transmission through atmosphere, even during bad weather conditions

The optical directional transmission device (1) is suitable for data transmission through the atmosphere, even during bad weather conditions. It has a pulsed laser light soruce (3) in a few nanometer wide spectral window at 905 nm or 267 nm. For enlargement of the effective receiving surface (8) at least one reflector (7) focusses the transmission beam (5) on the detector surface (9) of the receiver. Through the choice of wavelength, a favorable transmission is achieved, even in damp atmosphere. Through a pulsed operation, a light modulation very insensitive to disturbance is achieved, and thereby a low bit error rate.

RETURN-WAVE PHASE CONTROLLED ADAPTIVE ARRAY

METHOD FOR TRANSMITTING DATA WITH A VARIABLE DATA RATE VIA AN OPTICAL TRANSMISSION PATH

TURNING MISSILE EMITTING LUMINOUS IMPULSES.

- Selon l'invention, on prévoit des moyens pour interrompre lesdites impulsions lumineuses (5) lorsque le mouvement de rotation (3) du missile (2), autour de son axe longitudinal (L-L), cesse. - According to the invention, means are provided for interrupting said light pulses (5) when the rotational movement (3) of the missile (2), around its longitudinal axis (L-L), ceases.

SYSTEM AND PROCESS OF COMMUNICATIONS Of INFORMATION PROTEGEES

PROCEDE POUR AUGMENTER L'ECLAIREMENT PRODUIT PAR UN FAISCEAU LASER

L'invention concerne un procédé pour augmenter l'éclairement produit par un faisceau laser sur une cible, consistant à réfléchir ce faisceau sur un miroir déformable comprenant plusieurs éléments piézo-électriques. On augmente successivement la tension de polarisation de chacun des éléments 5, 6, 7 d'une tension continue prédéterminée, cette augmentation n'étant maintenue que si elle correspond à une augmentation de l'intensité lumineuse diffusée par la cible 15. Application à la focalisation sur une antenne de l'énergie d'un faisceau laser transmettant des informations.

System and method for wavelength modulated free space optical communication

A system and method is provided for free-space optical communication in which information is encoded on at least two discrete optical carrier signals. The system includes a transmitter configured to encode information into at least two optical carrier signals and a receiver configured to receive and decode the information from the at least two optical carrier signals.

OPTICAL WIRELESS COMMUNICATIONS USING ULTRA SHORT LIGHT PULSES AND PULSE SHAPING

An optical, wavelet-based fractal modulation of ultra-short light pulses is used as part of a high-bandwidth communications system (Fig. 2). The preferred embodiment utilizes the scheme as part of a hybrid wireless optical and RF transmission system for broadband communications among fixed and/or mobile platforms. An ultra-short pulse laser, high power WDM-ARRAY laser or high-power incoherent light sources may be used.

Optical communications system and method

An optical communication system includes a master unit, one or more beam-deflectors, and one or more client units, interconnected by free-space beam path. Methods are described for automatically aligning the various components of the optical circuit, without human intervention or assistance, and without advance knowledge of the location of individual components in space.

Optical space transmission module

An optical space transmission module reduces an upper limit of light output based on a safety standard of a laser, reduces light returned to a laser, and is made smaller in size. The optical space transmission module includes a light emitting section which outputs a transmission light, a base section including a reflection section which reflects the transmission light, and a reflection type diffusion section which reflects and converts into a diffused light the reflected light which has been reflected by the reflection section. The reflection section has a function to increase a beam diameter of the transmission light after reflection.

Adaptive photonic coupler

A method to maximize the coupling efficiency between a collimated, free-space optical signal and a fiber optic waveguide using an active optical element to steer and focus the collimated beam driven by an adaptive controller that periodically auto-calibrates the active optical element's parameters to maximize the measured power received by the waveguide using a gradient ascent optimization algorithm.

TRANSMITTING DEVICE, COMMUNICATION SYSTEM, AND METHOD FOR TRANSMISSION LEVEL CONTROL

A transmitting device includes a transmitter configured to transmit signal light to an external receiver over a medium included in a transmission line; and a controller configured to control a transmission level of the signal light in accordance with a reception level of probe light which is input from the receiver over the medium in the transmission line.

SYSTEM AND METHOD FOR RECEIVING SIGNAL INFORMATION FOR NETWORKING USING A FREE SPACE OPTICAL LINK

A system for optical detection may include a focal plane array. The system may further include one or more lenses configured to focus a collimated light beam received at the one or more lenses onto the focal plane array, where a position of the collimated light beam on the focal plane array is based on an incident angle of propagation of the collimated light beam at the one or more lenses. The system may also include a micro-channel plate collimator positioned within an optical path of the collimated light beam. The system may include a processor configured to determine the incident angle of propagation of the collimated light beam and to retrieve data encoded within the collimated light beam.

Apparatus and method for performing communication using chrominance information in visible light communication system

In a transmission apparatus, a reception apparatus and a method for performing communication using chrominance information, a transmission apparatus includes a symbol converter to obtain a symbol from data; a symbol modulator to generate a chrominance value based on the symbol; a luminance controller to generate a luminance value; a color space converter to generate an RGB value based on the luminance value and the coordinate value; and a light emitting unit to emit light based on the RGB value. A reception apparatus includes a visible light receiver to receive light and to generate an electrical signal having RGB color information of the light; a color space converter to generate a luminance value and a chrominance value based on the RGB color information; a symbol demodulator to obtain a symbol based on the chrominance value; and a data converter to convert the symbol to data.

Method for atmospheric optical free space transfer of digital signals and recipients for the method

Optical heterodyne detection method and apparatus for applying the method to practical use

An optical heterodyne detection method of detecting a beat signal by heterodyne detection using a superimposition of two or more beams of light including a signal beam and a reference beam, includes the steps of: generating a scattered reference beam from the reference beam: and detecting the beat signal obtained from the scattered reference beam and the signal beam, by superimposing the scattered reference beam and the signal beam. ...

Free space optical communication apparatus and angle adjusting method

MOBILE SYSTEM INCORPORATING FLEXIBLE AND TUNABLE ANTI-REFLECTIVE FILM AND METHOD

Verfahren und Vorrichtung zur Übertragungssignalnachführung in einem optischen Freiraumübertragungssystem

Verfahren und Anordnung zur Informationsübertragung mittels linear polarisierter elektromagnetischer Wellen

Verfahren und Anordnung zur Übertragung von Nutzsignal-Information (z. B. Sprache, Musik, Daten) mittels unterschiedlich linear polarisierter elektromagnetischer Wellen als Informationsträger. Die linear polarisierten elektromagnetischen Wellen haben jeweils einen anderen vorgebbaren Polarisationswinkel phi. Jede linear polarisierte Welle wird von einer anderen elektromagnetischen Ursprungswelle abgeleitet. Auf jede der linear polarisierten Wellen wird eine durch Modulation zu übertragende Nutzsignal-Information aufgeprägt. Empfangsseitig erfolgt eine polarisationswinkelspezifische Separierung der modulierten linear polarisierten elektromagnatischen Wellen und deren Demodulation.

Method for optical data transmission from a transmitting device to a receiving device

The present invention relates to free-space optical (FSO) transmission, preferably from a ground station to a satellite. The transmission apparatus transmits multiple data streams in respective frequency / wavelength bands (DF1, DF2, DF3). The present application builds on known transmit diversity systems for combating scintillation fluctuations. Thus, the first data stream, DF1, is transmitted redundantly by a first transmitter and a second transmitter which is spatially offset from the first transmitter. However, in the present application, the first transmitter, TA, transmits, in a first beam BA, the first data stream in a first sub-band, F1A, of the first frequency band; and the second transmitter, TB, transmits, in a second beam BB, the first data stream in a second sub-band, F1B, of the first frequency band. Similarly, for each of the other data streams, the first and second transmitters use different sub-bands (F2A, F2B and F3A, F3B) of respective frequency bands (DF2 and DF3). In ...

Optical window

A window, for receiving a modulated beam of light, restricts the field of view of an optical system by total internal reflection. The window rejects the entry of unwanted radiation, such as noise, and comprises first and second triangularly shaped wedges 16, 20 of optical material. An entry face 36 of the first wedge 16 is perpendicular to a base plane 21, and its rear face 38 is at an acute angle to the entry face 36. An entry face 40 of the second wedge 20 is at the same angle to the base plane 21 as the rear face 38 of the first wedge 16, and the two wedges 16, 20 are separated by an air gap. Preferably, the rear face 38 of the first wedge 16 is contoured to reject incoming radiation from below the base plane 21, with comparable contouring of the adjacent faces of the first and second wedges 16, 20 permitting the entry of skew rays, to increase the directions in which desired radiation is admitted to the optical system.

Optical radiation devices

A device, particularly an antenna device, for emitting a beam of optical radiation to irradiate a remote target area. The device includes an optical source (10) having a limited wavelength band, and a hologram pattern (14) positioned in the path of a light beam originating from the source, the pattern being selected to produce a composite beam (20) having a predetermined shape or far field pattern conforming to the target area and/or a predetermined distribution of light intensity in the target area. Where the optical source is a point source, the hologram pattern (10) selectively retards the phase of respective components of the incident wavefront to produce a composite beam having a far field pattern that precludes focusing of the beam into a single small spot The device has particular application in a telecommunication system wherein a data signal is transmitted through free space by an optical beam, at least one characteristic of the beam being controlled by the hologram pattern in ...

RETURN-WAVE PHASE CONTROLLED ADAPTIVE ARRAY

... 1362155 Optical collimation HUGHES AIRCRAFT CO 8 May 1973 [8 May 1972] 21985/73 Heading H4D A wave energy transmission and reception system comprises means for transmitting energy at a target, means for receiving energy which has been returned from the target, an apertured image plane stop structure, modulation means in the path of the received beam for spatially modulating it with respect to said aperture, and detector means, disposed on the opposite side of said image plane stop structure from said modulation means. The system also comprises control means responsive to output signals from the detector means, which are indicative of the intensity of received energy passing through the aperture, for adjusting the relative phases of selected segments of the received energy beam so as to cause the energy in the adjusted received beam to approach an inphase condition. As described, an infra-red laser 10, Fig. 1, is synchronized by trigger pulses t x to emit output pulses, which are shaped ...

ONE-WAY TRANSMISSION SYSTEM

OPTICAL DATA LINK

TELESCOPE MIRROR FOR THE TRANSMISSION OF OPTICAL DATA OF HIGH RANGE IN THE FREE AREA

PROCEDURE FOR THE ATMOSPHERIC OPTICAL FREE SPACE TRANSMISSION OF DIGITAL SIGNALS AND RECEIVER FOR THE PROCEDURE

PROCEDURE FOR THE ATMOSPHERIC OPTICAL FREE SPACE TRANSMISSION OF DIGITAL SIGNALS AND RECEIVER FOR THE PROCEDURE

ROTARY, LIGHT PULSES OF SENDING FLUGKÍRPER

PROCEDURE AND DEVICE FOR THE REALIZATION OF AN OPTICAL CONNECTION WITH LASER PULSES

EMPF�NGER F�R WIRELESS COMMUNICATION WITH A CONCENTRATOR WITH TOTAL INTERNAL REFLECTION

APPARTUS AND METHOD FOR FREE-SPACE OPTICAL COMMUNICATION

Wireless fiber-coupled telecommunication systems based on atmospheric transmission of laser signals

Free space communication receiver unit with controllable power attenuator

METHOD AND APPARATUS FOR ALIGNING TELESCOPES WITHIN A FREE-SPACE OPTICAL COMMUNICATION SYSTEM

A free space optical communication system is disclosed whereby a transmit telescope and a receive telescope are aligned such that the point of maximum power of the received light beam is incident upon the optical fiber located at a specific point on the focal plane of the receive telescope. Such incidence is achieved by causing the transmitted beam to diverge by moving the transmit optical fiber to a point in front of the focal plane of the transmit telescope until at least a portion of the beam is incident upon the receive optical fiber. The transmit telescope and/or the receive telescope (or, alternatively, only the respective optical fibers of those telescopes) are then moved such that the point of maximum received power for that degree of divergence is incident upon the receive optical fiber. The transmit optical fiber, in response to received power measurements at the receive telescope, then incrementally moves back toward the focal plane of the transmit telescope thereby reducing ...

One-point-to-multipoint free space radio optical communication system

Apparatus for decoding information

Free-space communication system to heterodyne detection field.

Free space optical transmission system having luminous transmitter two different frequencies transmitting one intensity modulated with detector frequency difference signals transmitted formed.

The free space optical transmission system has a digital information signal (S(t)) with luminous transmissions (SRC) and an opto electrical detector (DET) detecting a frequency. The transmitter transmits two luminous waves (W0,W1) at two optical frequencies, one of which is modulated in intensity. The detection frequency is the difference between the two signals transmitted.

Improvements in or relating to Optical Frequency Communication Systems.

Solid-state system for tracking and regulating optical beams

A system comprising a solid-state optical beam regulator, an optical sensing device, and a computer provides for fast, accurate, and automatic tracking, steering, and shaping of an optical beam, such as that required in free-space optical communications. With a CMOS imager as the sensing device and a regulator constructed of a stress-optic glass material whose index of refraction is altered by induced stress, the system can track beam perturbations at frequencies greater than 1 kHz. This performance makes the system suitable for a variety of applications in free-space optical communications.

Optical communications link

The specification discloses a wireless optical communications link which includes a transmitter housing having circuitry for receiving electrical audio and video signals. A light emitting diode is mounted in the transmitter housing for generating a directional beam of light. Circuitry modulates the beam of light in accordance with the audio and video signals. A receiver housing is adapted to be located remote from the transmitter housing and includes an aspheric Fresnel lens for receiving and focusing the beam of light. A photodiode is mounted in the receiver housing for generating electrical output signals in response to the received beam of light. Circuitry is responsive to the electrical output signals for reconstructing the audio and video signals at the remote location.

Integrated Commercial Communications Network Using Radio Frequency and Free Space Optical Data Communication

A stabilized ultra-high bandwidth capacity transceiver system that combines an E-band (71-76 GHz, 81-86 GHz) millimeter wave RF transceiver with an eye-safe adaptive optics Free Space Optical (FSO) transceiver as a combined apparatus for simultaneous point-to-point commercial communications. The apparatus has a high degree of assured carrier availability under stressing environmental conditions. The apparatus establishes and maintains pointing and stabilization of mmW RF and FSO optical beams between adjacent line of sight apparatuses. The apparatus can rapidly acquire and reacquire the FSO optical carrier link in the event the optical carrier link is impaired due to adverse weather.

Integrated commercial communications network using radio frequency and free space optical data communication

A stabilized ultra-high bandwidth capacity transceiver system that combines an E-band (71-76 GHz, 81-86 GHz) millimeter wave RF transceiver with an eye-safe adaptive optics Free Space Optical (FSO) transceiver as a combined apparatus for simultaneous point-to-point commercial communications. The apparatus has a high degree of assured carrier availability under stressing environmental conditions. The apparatus establishes and maintains pointing and stabilization of mmW RF and FSO optical beams between adjacent line of sight apparatuses. The apparatus can rapidly acquire and reacquire the FSO optical carrier link in the event the optical carrier link is impaired due to adverse weather.

Hybrid through-air telecommunication system protected against outages

A hybrid through-air telecommunication system of a radio/optical type is described which significantly reduces the annual unavailability caused by weather events and/or faults. The hybrid optical and radio system further permits, given an annual availability value, of significantly increasing the maximum link distance if compared with the full radio or full optic systems. The changeover in reception occurs on the basis of the power values of the received signals.

Einkanalige Lichtkommunikation zur Fahrzeugregistrierung

Techniken und Beispiele, die eine einkanalige Sichtlinien(LOS)-Kommunikation betreffen, werden beschrieben. Das Übertragungsende der LOS-Kommunikation schließt eine direkte Modulation eines von einem Lichtemitter emittierten Lichts ein. Das Empfangsende der LOS-Kommunikation beinhaltet das Empfangen eines Videostroms des Lichtemitters, der das Licht emittiert, wobei der Videostrom eine Vielzahl von zeitlich kontinuierlichen Videoeinzelbildern umfasst. Das Empfangsende der LOS-Kommunikation schließt ebenfalls ein Umwandeln des Videostroms in eine binäre Zeichenfolge ein, die mehrere binäre Bits umfasst. Jedes der binären Bits entspricht einem jeweiligen der Vielzahl von Videoeinzelbildern und die binäre Zeichenfolge enthält ein wiederholtes binäres Muster, das eine Nachricht darstellt, die übermittelt wird. Das Empfangsende der LOS-Kommunikation schließt ebenfalls ein Extrahieren des binären Musters aus der binären Zeichenfolge und dann ein Decodieren des binären Musters, um die Nachricht ...

Verfahren und Vorrichtung zur Übertragungssignalnachführung in einem optischen Freiraumübertragungssystem

Verfahren zur atmosphärischen optischen Freiraumübertragung von digitalen Signalen und Empfänger für das Verfahren

Bei einem Verfahren zur atmosphärischen optischen Freiraumübertragung von digitalen Signalen, bei dem sendeseitig ein Laserstrahl mittels einer einen inkohärenten Empfang mit direkter Detektion erlaubenden Modulation, also nicht nur mit der einen pseudo-inkohärenten Direktdetektionsempfang ermöglichenden DPSK-Modulation moduliert wird und empfangsseitig in einem Demodulator (7) eine inkohärent ausgeführte Direktdetektion vorgenommen wird, wird empfangsseitig zusätzlich in einem kohärenten, mit einem Laser-Lokaloszillator (LO) betriebenen Demodulator (6) eine zweite Detektion durchgeführt. Die zwei mittels der beiden Demodulatoren (6, 7) detektierten elektrischen Signale werden diversitätsbildend einem signaloptimierenden Auswahl- oder Kombinierverfahren unterzogen. Anwendung bei atmosphärischer optischer Freiraumkommunikation.

ÜBERSPRECHUNGSREDUZIERUNG IN OPTISCHEN FREIRAUMKOMMUNIKATIONEN

Dataset transmission method for transmission of e.g. tourist information, to e.g. motor vehicle, involves transmitting data packets from transmission devices to combine packets in reception device during passing of devices to dataset

The method involves dividing a dataset (30) into small data packets (DP1-DPn) before transmission of the dataset, and providing each data packet with target characteristic value. The data packets are periodically transmitted from a number of stationary transmission devices to combine the data packets in a reception device of a movable object e.g. motor vehicle, during passing of the transmission devices to the dataset, where the transmission devices are provided longitudinal to paths. The transmission takes place using infrared-signals and each packet is provided with a checksum and signature. Independent claims are also included for the following: (1) an arrangement for wireless transmission of dataset using short-distance signal transmission (2) a transmission device for a dataset transmission arrangement (3) a reception device for a dataset transmission arrangement.

Verfahren zur atmosphärischen optischen Freiraumübertragung von digitalen Signalen und Empfänger für das Verfahren

Bei einem Verfahren zur atmosphärischen optischen Freiraumübertragung von digitalen Signalen unter Verwendung von Differential-Phase-Shift-Keying (DPSK), bei dem sendeseitig ein Laserstrahl mittels eines differentiell codierten Modulationssignals moduliert und empfangsseitig in einem Demodulator (14) das interferometrische Self-Homodyne-Prinzip mit Direktdetektion angewandt wird, erfolgt empfangsseitig zusätzlich in einem kohärenten, mit einem Laser-Lokaloszillator (LO) betriebenen Phasendemodulator (12) mit nachfolgender, elektrisch betriebener Bit-zu-Bit-Differenzschaltung (13) eine zweite Detektion. Die zwei mittels der beiden Demodulatoren (12, 14) detektierten Signale werden dann einem signaloptimierenden Auswahl- oder Kombinierverfahren (20) unterzogen. Anwendung bei atmosphärischer optischer Freiraumkommunikation.

Verfahren zum Verringern von bei optischer Freiraum-Kommunikation auftretenden Fading

Verfahren zum Verringern von bei optischer Freiraum-Kommunikation auf Grund von atmosphärischen Brechungsindex-Turbulenzen auftretendem Fading, wobei sendeseitig mit gleichen Signalen modulierte Träger mindestens zweier unterschiedlicher Wellenlängen in einem Strahlengang kombiniert und gesendet werden und empfangsseitig die auf den verschiedenen Trägern übertragenen, ursprünglich gleichen Signale detektiert und ausgewertet werden, dadurch gekennzeichnet, dass diese mit gleichen Signalen modulierten Träger mindestens zweier unterschiedlicher Wellenlängen (λ1, λ2) synchron gesendet werden und dass bei der empfangsseitigen Detektion und Auswertung die Tatsache ausgenutzt wird, dass sich die Signale nach der Übertragung infolge unterschiedlicher Specklemuster unterscheiden, die sich auf Grund von sich auf die mindestens zwei unterschiedlichen Wellenlängen beziehenden Wellenlängendiversitäten ergeben, wobei die Detektion der Signale entweder mittels eines für alle verwendeten Wellenlängen gemeinsamen ...

Verfahren und Gerät für digitale Übertragung.

Electromagnetic device with integral non-linear component

An optical antenna assembly including multiple optical antenna elements, each of the optical antenna elements are arranged in a regular pattern and carried by a supporting body. The regular pattern of the plurality of optical antenna elements is nonuniform. Certain ones of the optical antenna elements are configured to respond to the one or more waves of light.

An optical freespace communication system which selects emitters from an array to provide beam steering

This application concerns acquiring and maintaining optical alignment between a transmitter and receiver in a free-space optical communication system. The transmitter includes a plurality of optical transmitters, such as a VCSEL array or an LED array, located in the focal plane of an optical element such as a lens. Each emitter illuminates a different area vicinity of the receiver. Optical alignment between the transmitter and the receiver can be achieved by selecting the appropriate emitter to use. As either the transmitter or receiver moves, alignment can be maintained simply by switching to another emitter. This beam selection system has significant advantages over prior art mechanical alignment systems. Optionally, more than one emitter may be selected at a time. In one embodiment multiple emitters are selected to provide communication to multiple receivers. Bidirectional communication is envisioned.

Wireless communication receivers

A system for improving and maintaining alignment in free space optical systems

Free space optical receiver

In a free space optical communication system, transmitted light beams are distorted by atmospheric turbulence, which results in light beams with a plurality of modes. However, it is desirable for receiver chain preamplifiers to have single mode input. This disclosure relates to a free space optical receiver which receives a light beam (comprising a plurality of modes) at a multi-mode fibre 102, the light beam having been propagated through a free space path. The receiver has mode separating means 104 to separate light from the multi-mode fibre into a plurality of single-mode signals 106. Combining means 108 combine two or more of the plurality of single-mode signals into a combined signal for transmission through a further transmission medium 110, such as a single-mode fibre. The combining means may comprise a plurality of polarization combiners (208a-208b, Fig. 2) feeding into a directional coupler (228a, Fig. 2) or switching means (338, Fig. 3b) which selects a subset of the single mode ...

PROCEDURE FOR REDUCING FADING ARISING WITH OPTICAL FREE SPACE COMMUNICATION

PROCEDURE AND DEVICE FOR THE PRODUCTION OF AN ERROR SIGNAL WITH COHERENT SUPERHETERODYNE RECEPTION OF LIGHT WAVES

CROSS MODULATION REDUCTION IN OPTICAL FREE SPACE COMMUNICATIONS

PROCEDURE AND DEVICE FOR STEERING THE TRANSMITTING POWER DENSITY IN AN OPTICAL FREE SPACE TRANSMISSION SYSTEM

WIRELESS BROAD BAND COMMUNICATION SYSTEM AND PROCEDURE

BROADBAND WIRELESS COMMUNICATION SYSTEM AND METHOD

METHOD, APPARATUS AND SYSTEM FOR BEAM STEERING

METHOD AND APPARATUS FOR MAINTAINING AN OPTICAL WIRELESS LINK

Appartus and method for free-space optical communication

USPL-FSO lasercom point-to-point and point-to-multipoint optical wireless communication

Enhancements in optical beam propagation performance can be realized through the utilization of ultra-short pulse laser (USPL) sources for laser transmit platforms, which are can be used throughout the telecommunication network infrastructure fabric. One or more of the described and illustrated features of USPL free space-optical (USPL-FSO) laser communications can be used in improving optical propagation through the atmosphere, for example by mitigating optical attenuation and scintillation effects, thereby enhancing effective system availability as well as link budget considerations, as evidenced through experimental studies and theoretical calculations between USPL and fog related atmospheric events.

OPTICAL DATA LINK

METHOD AND APPARATUS FOR THE CORRECTION OF OPTICAL SIGNAL WAVE FRONT DISTORTION WITHIN A FREE-SPACE OPTICAL COMMUNICATION SYSTEM

A free space optical communication system is disclosed whereby the optics of a transmit telescope are manipulated using adaptive optics to precompensate for wave front distortion of a light beam transmitted by a transmit telescope. Wave front distortion is manifested at the receive telescope as a change in at least one characteristic of the image of the received signal such as, for example, a reduction in the amplitude of the received signal. A mirror of the transmit telescope is deformed in such a way as to reduce the wave front distortion and correspondingly increase the resulting amplitude of the received signal.

METHOD AND DEVICE FOR GENERATING AN ERROR SIGNAL IN CONNECTION WITH THE COHERENT HETERODYNE RECEPTION OF LIGHTWAVES

The device is used for generating error signals for regulating the optical alignment of two lightwaves in connection with coherent heterodyne reception and comprises a receiver device (2, 3, 4) arranged focused opposite a front face at the end of a lightwave fiber (1) in order to make possible the transmission of the received information lightwave through the lightwave fiber (7) to an optical waveguide coupler (6), which is connected via a further lightwave fiber (13) with a local laser (12) and via two further lightwave fibers (8, 9) with respectively one detector (10, 11) for generating at least one error signal (Sr). A piezoelectric deflection unit (5) acts on this front face of the lightwave fiber (7) located in the focusing area of the receiving device.

Communication system in free space with detection heterodyne receiver large field

Le système de communication selon l'invention comporte une station émettrice (1) équipée d'une source laser (10) émettant un faisceau d'ondes lumineuse cohérente de fréquence de base (F0 ) modulée par une fréquence porteuse du signal utile correspondant aux informations à transmettre, et une station réceptrice apte à recueillir ces informations à partir d'un signal de battement formé par mélange du faisceau (F') provenant de la station émettrice (1) et d'un faisceau d'ondes (FI ) provenant d'un oscillateur local (23). Le faisceau (F) émis par la station émettrice comporte un sous-faisceau de référence (F1) d'ondes de fréquence de base (F0 ) non modulées formant un signal de référence et un sous-faisceau utile (F2) dont les ondes sont modulées sur une porteuse à travers une cellule acoustooptique (12) pour former un signal d'information utile; la station réceptrice (2) comporte un élément à cristal non linéaire (22) dans lequel seules les ondes du faisceau (Fp ) par la source locale (23) ...

DATA TRANSMISSION METHOD WITH A VARIABLE DATA RATE VIA AN OPTICAL TRANSMISSION PATH

Dans le procédé de transmission de données avec débit de données variable via une voie de transmission optique entre un émetteur (32) et un récepteur (30), l'émetteur (32) module un rayonnement électromagnétique avec une fréquence de modulation affectée au débit de données choisi qui se situe entre une valeur limite inférieure correspondant au débit de données le plus petit possible et une valeur limite supérieure correspondant au débit de données le plus grand possible. Le récepteur (30) est informé de la fréquence de modulation actuellement utilisée par l'émetteur (32). Le rayonnement électromagnétique modulé reçu est converti dans le récepteur (30) en un signal (44) électrique bruité. Ce signal (44) électrique est converti en un premier signal binaire (46) qui adopte alternativement une première valeur de signal (48) représentant un 0 binaire et une deuxième valeur de signal (50) représentant un 1 binaire. Le premier signal binaire (46) est chronologiquement divisé en intervalles (52 ...

PROCESS AND DEVICE OF LOCALIZATION OF SOURCE OF COMMUNICATION, MOBILE COMMUNICATION SYSTEM USING SUCH A DEVICE

La présente invention concerne un procédé de localisation d'une source de communication mobile et un dispositif de localisation d'une source de communication. Elle trouve application pour un système de communication mobile qui utilise au moins un tel dispositif. Le dispositif de localisation est du genre qui comporte une pluralité (1-4) de détecteurs d'ondes infrarouge fonctionnant en tout ou rien, chaque détecteur étant inséré dans un support absorbant des ondes infrarouge laissant passer les rayonnements infrarouges provenant de sources possibles de communication depuis un secteur géométrique déterminé. Le dispositif comporte un moyen (10) à l'entrée duquel sont fournis les signaux des détecteurs mis en forme, pour déterminer (11C) la puissance la plus faible reçue par au moins un détecteur quand la dite pluralité de détecteurs a été éclairée par une récurrence de trames de puissances déterminées produites par une source de communications déterminée.

METHOD FOR TRANSMITTING A CHANNEL MEASUREMENT RESULT IN A WIRELESS TELECOMMUNICATIONS SYSTEM USING A MODE WHICH MIXES TWO KINDS OF CONCEPTS CALLED AN EVENT

PURPOSE: A method for transmitting a channel measurement result in a wireless communications system using a mode which mixes two kinds of concepts is provided to reduce signaling load by using second discrimination mode in order to efficiently use the radio resource. CONSTITUTION: Network transmits the measurement control information to a terminal through a measurement control message(S601). The channel measurement result is transmitted to network when satisfying a condition(S603). Network delivers the measurement control information to the terminal through the measurement control message. The measurement result is reported in network according to the measurement based on measurement control information. According to the measurement control information is an RRC(Radio Resource Control) mode of the terminal, it is delivered to the terminal through the other route. © KIPO 2009 ...

INTEGRATED COMMERCIAL COMMUNICATIONS NETWORKS USING RADIO FREQUENCY AND FREE SPACE OPTICAL DATA COMMUNICATION

A stabilized ultra-high bandwidth capacity transceiver system that combines an E- band (71-76 GHz, 81-86 GHz ) millimeter wave RF transceiver with an eye-safe adaptive optics Free Space Optical (FSO) transceiver as a combined apparatus for simultaneous point- to-point commercial communications. The apparatus has a high degree of assured carrier availability under stressing environmental conditions. The apparatus establishes and maintains pointing and stabilization of mmW RF and FSO optical beams between adjacent line of sight apparatuses. The apparatus can rapidly acquire and reacquire the FSO optical carrier link in the event the optical carrier link is impaired due to adverse weather.

ELECTROMAGNETIC DEVICE WITH INTEGRAL NON-LINEAR COMPONENT

An optical antenna assembly including multiple optical antenna elements (102), each of the optical antenna elements are arranged in a regular pattern and carried by a supporting body. The regular pattern of the plurality of optical antenna elements is nonuniform. Certain ones of the optical antenna elements are configured to respond to the one or more waves of light.

REMOTELY-INTERROGATED HIGH DATA RATE FREE SPACE LASER COMMUNICATIONS LINK

A system and method of remotely extracting information from a communications station by interrogation with a low power beam. Nonlinear phase conjugation of the low power beam results in a high power encoded return beam that automatically tracks the input beam and is corrected for atmospheric distortion. Intracavity nondegenerate four wave mixing is used in a broad area semiconductor laser in the communications station to produce the return beam.

METHOD, APPARATUS AND SYSTEM FOR BEAM STEERING

A true-time delay feeder for multiple aperture beam steering devices. The feeder comprises a plurality of tunable time delay modules. The tunable time delay modules provide different delays to different beamlets without changing the spectrum of each beamlet. The tunable true-time delay modules provide for temporal synchronization and spatial coherence of the beam front.

High Speed Error Detector for Fading Propagation Channels

A customized bit error rate tester that characterizes data transmission through a free space optical channel that overcomes the limitations of commercial based bit error rate testers by providing visibility into packet based channel capacity by measuring bit-level statistics not dominated by fades. In this manner, fade characteristics can be measured and a relationship between fade time and data packet lengths can be developed. Further, analog outputs provide visual real-time data link statistics.

Fiber-Optic Automatic Gain Control Systems and Methods

Methods and systems to control a gain applied to a free-space optical (FSO) signal to reduce time-varying intensity fluctuations. An optical pre-amplifier may provide a first, relatively moderate gain with low noise factor (NF). A second optical amplifier may provide a second gain. Amplification may include doped fiber amplification (DFA), such as erbium-doped fiber amplification (EDFA) and/or Raman amplification. A variable optical attenuator (VOA) may be controllable with a relatively fast response time to reduce the time-varying intensity fluctuations. The VOA may effectively control an overall system gain. The gain of the first and/or second optical amplifier may also be controllable to reduce the time-varying intensity fluctuations. Optical intensities may be detected at one or more locations to support one or more feed-forward and/or feedback control loops. A clamp may be applied when an optical power reaches a threshold.

SINGLE PHOTONS SOURCE AND KEY DISTRIBUTION

A method of key distribution, a key distribution system, a single photon source system and a method of generating single photons. The method of key distribution comprises the steps of: providing a free space optics, FSO, link between a transmitter and a receiver; detecting whether an eavesdropper is present along the FSO link; transmitting individual photons or weak coherent pulses, as an approximation of individual photons, each encoding a basic unit of the key according to a binary or higher number base system from the transmitter to the receiver; and comparing timing information associated with the transmission and reception of the individual photons for determining the key when it is detected that no eavesdropper is present along the FSO link. 1. A method of key distribution comprising the steps of:providing a free space optics, FSO, link between a transmitter and a receiver;detecting whether an eavesdropper is present along the FSO link;transmitting individual photons or weak coherent pulses, as an approximation of individual photons, each encoding a basic unit of the key according to a binary or higher number base system from the transmitter to the receiver; andcomparing timing information associated with the transmission and reception of the individual photons for determining the key when it is detected that no eavesdropper is present along the FSO link.2. The method of claim 1 , wherein transmitting the individual photons comprises generating a mixture of photon pairs encoding different basic units claim 1 , respectively claim 1 , using Spontaneous Parametric Downconversion claim 1 , SPDC.4. (canceled)5. The method of claim 1 , comprising generating single photons using one or more solid state single photon emitters claim 1 , and/or wherein each photon encodes the basic unit of the key as a wavelength state.6. The method of claim 1 , comprising using a decoy state system to mitigate an eavesdropper harvesting the quantum signals that have been scattered by ...

High-speed wide field-of-view electro-optic system and method

An electro-optic modulator comprising at least one nanodisordered potassium tantalate niobate crystal; first and second conductors operatively connected to the nanodisordered potassium tantalate niobate crystal adapted to be connected to a voltage source to modulate light passing there through; whereby light is modulated by passing through the nanodisordered potassium tantalate niobate crystal. A method for modulating light comprising providing at least one at least one nanodisordered potassium tantalate niobate crystal; providing first and second conductors operatively connected to the nanodisordered potassium tantalate niobate crystal adapted to be connected to a voltage source to modulate light passing there through; providing an interrogating light beam striking at least one nanodisordered potassium tantalate niobate crystal; modulating light passing through the nanodisordered potassium tantalate niobate crystal; and receiving a modulated light beam.

FREE SPACE OPTICAL COMMUNICATION SYSTEM, APPARATUS AND A METHOD THEREOF

The present invention provides a free space optical communication system that uses orthogonal modes of aberration in a laser beam as means for encoding the information. The system comprises a transmission station which transmits the user defined information in terms of the amplitudes of certain orthogonal aberration modes present in the transmitted beam. The beam then travels through free space before it reaches the receiving station. The receiving station comprises a high speed wavefront sensor of light beams. The wavefront sensor measures the amplitudes of various orthogonal aberration modes present in the incident beam at different instants of time. The amplitudes of the orthogonal modes at a certain regular time interval are then used to extract the user information. 1. A free space optical communication system comprising at least one transmitting unit and at least one receiving unit , wherein: encode using alternate polarity of said user data shifted to ternary number, said incident laser beam at two or more consecutive instants of time;', 'generate, at least one data encoded laser beam; and thereby transmit said data encoded laser beam to said receiving unit;', 'wherein, said user data in said data encoded laser beam is indicative of amplitudes relative to time of said orthogonal modes;, 'at least one light modulator displaying binary holograms and configured to, 'said transmitting unit transmits at least one incident laser beam aberrated using plurality of orthogonal modes and at least one user data, said transmitting unit comprises [ detect the presence of aberration in said input laser beam;', 'generate, first and second aberration sensor output signals, in the case of the modal wavefront sensor, or only one aberration sensor output signal in the case of the zonal wavefront sensor, corresponding to each input laser beam; and', 'transmit said first and second aberration sensor output, 'at least one wavefront sensor, adapted to, 'determine, said amplitudes of ...

Coded-light detection system including a camera, light sensor and augmented information display

There is disclosed a sensing device () adapted to receive light emitted from a plurality of light sources (A, B), each of the plurality of light sources (A, B) emitting light comprising a light source identifier. The sensing device () comprises a sensing module () comprising a light selection unit () configured to receive at least a portion of the light emitted from the plurality of light sources (A, B) and a light selection unit () configured to receive at least a portion of the light emitted from the plurality of light sources (A, B). The light selection unit () is adapted to selectively convey a selected portion of light received by the light selection unit () to a second photo sensor unit (). The light selection unit () is arranged relatively to the first photo sensor unit (), or vice versa, in such a way that the selected portion of light is associated with a photo sensor of a plurality of photo sensors of the first photo sensor unit () detecting light. 1. A sensing device configured to receive light emitted from a plurality of light sources , at least some of the plurality of light sources emitting light comprising a light source identifier , the sensing device comprising:a sensing module comprising:a first photo sensor unit configured to receive at leas a portion of the light emitted from the plurality of light sources, the first photo sensor unit comprising a plurality of photo sensors, at least some of the plurality of photo sensors being configured to detect light impinging on said photo sensor;a light selection unit configured to receive at least a portion of the light emitted from the plurality of light sources; anda second photo sensor unit configured to generate a signal corresponding to light impinging thereon;the light selection unit being configured to selectively convey a selected portion of light received by the light selection unit to the second photo sensor unit;the light selection unit being arranged relatively to the first photo sensor unit in ...

Systems, Devices, and Methods for Optical Communication

A technology is described for optical communication. An example of the technology can include receiving an event stream containing indications of independent events detected by pixels in an event camera. An event may be a change in brightness detected by a pixel in the pixel array, and the pixel independently generates an indication of the event in response to detecting the event. The event stream can be demultiplexed into a plurality of communication streams containing related events associated with a plurality of communication sources. The events contained in a communication stream can be aggregated based in part on an event proximity and an event time that associates an event with other events contained in the event stream. The plurality of communication streams can be demodulated to extract optically transmitted information from the plurality of communication streams, which can be sent to a data consumer. 1an event camera having a pixel array comprising a plurality of pixels, each pixel of the pixel array being configured to independently detect an event representative of a change in brightness detected by the pixel, and to independently generate an indication of the event in response to detecting the event;at least one processor;a memory device including instructions that, when executed by the at least one processor, cause the system to:receive an event stream from the event camera, wherein the event stream contains indications of events detected by at least a portion of the pixels in the event camera;identify related events in the event stream based in part on event proximity and event time;identify the related events as a communication sent by a communication source;aggregate the related events to form a communication stream associated with the communication sent from the communication source; anddemodulate the communication stream to extract the communication from the communication stream.. A system for optical communication, comprising: This is a ...

METHOD AND SYSTEM FOR WIRELESS DATA TRANSMISSION

A method for wireless data transmission between a first communication device and a second communication device, wherein the first communication device acts as a data source and the second communication device acts as a data sink, includes: splitting, by the data source, data to be transmitted from the data source to the data sink into a carrier signal for a radio channel and an optical carrier signal by modulating the carrier signals; transmitting the data via a hybrid transmission path from the data source to the data sink by simultaneously transmitting some of the data via the radio channel and some of the data via a wireless optical direct channel; and merging, by the data sink, via a demodulation process, the data transmitted via the radio channel and the data transmitted via the wireless optical direct channel. 1. A method for wireless data transmission between a first communication device and a second communication device , wherein the first communication device acts as a data source and the second communication device acts as a data sink , wherein the data source and the data sink are configured to be arranged in variable positions with respect to one another and in direct optical visual contact , and wherein the method comprises:splitting, by the data source, data to be transmitted from the data source to the data sink into a carrier signal for a radio channel and an optical carrier signal by modulating the carrier signals;transmitting the data via a hybrid transmission path from the data source to the data sink by simultaneously transmitting some of the data via the radio channel and some of the data via a wireless optical direct channel; andmerging, by the data sink, via a demodulation process, the data transmitted via the radio channel and the data transmitted via the wireless optical direct channel;wherein transmission over the radio channel utilizes a standardized radio carrier signal for wireless local area network (WLAN) networks; andwherein an ...

SATELLITE SYSTEM USING OPTICAL GATEWAYS AND GROUND BASED BEAMFORMING

Described herein are ground based subsystems, and related methods, for use in transmitting an optical feeder uplink beam to a satellite that includes a multiple element antenna feed array and that is configured to accept the optical feeder uplink beam and in dependence thereon use the multiple element antenna feed array to produce and transmit a plurality of radio frequency (RF) service downlink beams to service terminals. Certain embodiments are related to a ground based beamformer (GBBF) for inclusion in a ground based subsystem, and methods for use therewith. Beneficially, embodiments described herein allow for flexible antenna beam forming for large signal bandwidth without the limitation associated with the available gateway uplink and downlink spectrum at RF frequencies. Also described herein are space based subsystems for use with such ground based subsystems. 1. A ground based subsystem for use in transmitting an optical feeder uplink beam to a satellite that includes a multiple element antenna feed array and that is configured to input the optical feeder uplink beam and in dependence thereon use the multiple element antenna feed array to produce and transmit a plurality of RF service downlink beams to service terminals , the ground based subsystem comprising:a ground based beamformer (GBBF) configured to accept a plurality of spot beam signals, produce or otherwise obtain phase and amplitude beamforming coefficients, and output a plurality of feed element signals in dependence on the plurality of spot beam signals and the phase and amplitude beamforming coefficients;a plurality of lasers, each of the lasers operable to emit an optical signal having a different peak wavelength within a specified optical wavelength range;a plurality of electro-optical modulators (EOMs), each EOM of the plurality of EOMs configured to accept an optical carrier signal from a respective one of the plurality of lasers, accept a different one of the plurality of feed element ...

Dual-mode imaging receiver

A dual-mode imaging receiver (DMIR) can acquire and maintain SOA free-space optical communication (FSOC) links without a precision mechanical gimbal. Unlike other FSOC technologies, a DMIR can operate without precise spatial alignment and calibration of the transmitter's or receiver's spatial encoders (precision pointing) in static (fixed point to point) geometries. Instead, a DMIR uses electronic receive beam selection to acquire and track transmitters with coarse mechanical pointing and a single aperture. And because the DMIR can operate with just one aperture, it does not need a beacon at the transmitter since it does not transition from a wide field-of-view acquisition aperture to a narrow field-of-view detection and decoding aperture even in dynamic geometries.

FREE SPACE OPTICAL RECEIVER AND FREE SPACE OPTICAL RECEIVING METHOD

It is impossible to prevent the deterioration of the coupling efficiency between received light and a single mode fiber, and difficult to achieve a higher transmission rate, with respect to a free space optical communication receiver; therefore, a free space optical receiver according to an exemplary aspect of the present invention includes light collecting means for collecting laser light having propagated through a free space transmission path; mode controlling means for separating the laser light collected by the light collecting means into a plurality of propagation mode beams depending on a wave-front fluctuation of the laser light and outputting the propagation mode beams; a plurality of single mode transmission media for guiding the plurality of propagation mode beams, respectively; and a plurality of light receiving means for receiving the plurality of propagation mode beams respectively through the plurality of single mode transmission media. 1. A free space optical receiver , comprising:a light collecting unit configured to collect laser light having propagated through a free space transmission path;a mode controlling unit configured to separate the laser light collected by the light collecting unit into a plurality of propagation mode beams depending on a wave-front fluctuation of the laser light and output the propagation mode beams;a plurality of single mode transmission media configured to guide the plurality of propagation mode beams, respectively; anda plurality of light receiving units configured to receive the plurality of propagation mode beams respectively through the plurality of single mode transmission media.2. The free space optical receiver according to claim 1 ,wherein the mode controlling unit produces multimode beams from the laser light and produces a plurality of propagation mode beams obtained by converting high-order mode beams included in the multimode beams into low-order mode beams by controlling the multimode beams.3. The free ...

Optical Signal Communication Method and Device, Biometric Data Monitoring System Using the Same

Disclosed are an optical signal communication method and device and a biometric data monitoring system using the optical signal communication method and device. An optical signal communication method performed by an optical signal transmitting device includes receiving current input data to be modulated into an optical signal, dividing the received current input data into a plurality of sub-data sets including first sub-data and second sub-data, modulating the current input data into an optical signal including a start pulse, an intermediate pulse, and an end pulse based on the sub-data sets, and transmitting the optical signal to an optical signal receiving device.

Systems and methods for free space optical communication using active beam steering

A system and method for performing free space optical communication with a plurality of streetlamp assemblies. The method includes transmitting a light beam from a first free space optical (FSO) unit of a first streetlamp assembly to a second FSO unit of a second streetlamp assembly along a transmission path. A transmission error is detected while transmitting the light beam along the transmission path. A location of one or more smart minors is obtained. An alternate transmission path is determined from the first FSO unit to the second FSO unit or a third FSO unit. The alternate transmission path includes a reflection of the light beam from the one or more smart minors. The first FSO unit is oriented with respect to the alternate transmission path. The light beam is transmitted from the first FSO unit along the alternate transmission path.

Multi-link mobile communications

Systems and methods presented herein provide for improved access to data. In one embodiment, a communication system includes an RF communication link that is operable to receive first communications from a mobile device (e.g., a cell phone, tablet computer, laptop computer, or other “user equipment”). The communication system also includes a processor operable to determine a location of the mobile device based on the first communications and a plurality of directional communication links. Each directional communication link is operable to transfer data to the mobile device based on the location of the mobile device as determined by the processor. The processor is also operable to coordinate the transfer of data from each of the directional communication links to the mobile device.

Integrated Commercial Communications Network Using Radio Frequency and Free Space Optical Data Communication

A stabilized ultra-high bandwidth capacity transceiver system that combines an E-band (71-76 GHz, 81-86 GHz) millimeter wave RF transceiver with an eye-safe adaptive optics Free Space Optical (FSO) transceiver as a combined apparatus for simultaneous point-to-point commercial communications. The apparatus has a high degree of assured carrier availability under stressing environmental conditions. The apparatus establishes and maintains pointing and stabilization of mmW RF and FSO optical beams between adjacent line of sight apparatuses. The apparatus can rapidly acquire and reacquire the FSO optical carrier link in the event the optical carrier link is impaired due to adverse weather.

Intensity-modulated direct detection with multi-channel multi-beaming

Optical communication systems and methods using coherently combined optical beams are disclosed. A representative system includes a first data source for sending first data at a first frequency of a first optical beam to a first aperture, and at a second frequency of a second optical beam to a second aperture. The system further includes a second data source for sending second data at a third frequency of a third optical beam to the first aperture, and at a fourth frequency of a fourth optical beam to the second aperture. The system also includes a first interleaver of the first aperture configured to interleave the first data at the first frequency and the second data at the third frequency; and a second interleaver of the second aperture configured to interleave the first data at the second frequency and the second data at fourth frequency.

SYSTEM AND METHOD FOR IDENTIFYING AND TRACKING A MOBILE LASER BEACON IN A FREE SPACE OPTICAL SYSTEM

A method supported by a first terminal is provided herein. To implement the method, a camera of a first terminal performs two or more captures of two or more frames along a line of sight toward a second terminal. A controller of the first terminal manipulates the two or more frames to produce two or more interim images and analyzes the two or more interim images to track a beacon of the second terminal. The controller outputs coordinates with respect to the tracked beacon to a mirror package of the first terminal. 1. A method comprising:performing, by a camera of a first terminal, two or more captures of two or more frames along a line of sight toward a second terminal;manipulating, by a controller of the first terminal, the two or more frames to produce two or more interim images;analyzing, by the controller, the two or more interim images to track a beacon of the second terminal; andoutputting, by the controller to a mirror package of the first terminal, coordinates with respect to the tracked beacon.2. The method of claim 1 , wherein the two or more captures are synchronous with a flashing claim 1 , by a beacon device of the second terminal claim 1 , of the beacon claim 1 , such that the beacon is on for a last frame of the two or more frames and off for a current frame of the two or more frames.3. The method of claim 1 , wherein the manipulation of the two or more frames comprises executing an image registration to process a last frame of the two or more frames to a current frame of the two or more frames.4. The method of claim 1 , wherein the manipulating of the two or more frames comprises:executing a frame subtraction to calculate a difference between pixels of the two or more frames; andgenerating a differenced image based on the calculated difference.5. The method of claim 1 , wherein the manipulating of the two or more frames comprises executing a thresholding to set pixels with values below a predefined level to zero claim 1 , the pixels being defined by ...

Position measuring apparatus, position measuring method, and non-transitory computer readable recording medium

A position measuring apparatus instructs a first node to emit light by transmitting a first light emission pattern to the first node, instructs a second node to emit light by transmitting the first light emission pattern to the second node, when light emission following the instructed first light emission pattern is detected, and instructs the second node to emit light by transmitting a second light emission pattern that is different from the first light emission pattern, when light emission following the instructed first light emission pattern is not detected.

Broadband Wireless Communication System and Method

Free space optical communication is plagued by interruptions in the connections caused by atmospheric phenomena, such as weather. A wireless beam transmission system includes at least one transmitter ( 110 ) and accommodates several wavelengths, and at least one transmission wavelength is arranged to be chosen based on spectral absorption measurements of the atmosphere in the carrier beam path of communication. The invention concerns also a transceiver for repeating wireless optical communication signals. The long range and high reliability of spectroscopically sensitive light beams at a penetrating frequency allow the affordable provisioning of high bandwidth optical or IR communication connections to devices and buildings that were previously either very expensively connected to the fiber optic backbone networks, expensive low bandwidth radio or microwave networks, or unreachable by traditional free space optics solutions.

PERSONAL AUGMENTED REALITY

The present disclosure provides systems and methods for enabling Personal Augmented Reality (PAR). PAR can include an emitor configured to receive data signals and emit the data signals as light signals. PAR can further include a smart device configured to receive the light signals emitted by the emitor. The smart device can process the light signals to yield a communication and display the communication on a screen. 1. A system , comprising:at least one emitor configured to emit a pre-defined lighting sequence; and acquire a plurality of images of an area including the at least one emitor;', 'detect the pre-defined lighting sequence from the plurality of images;', 'assemble augmented reality indicia based one pre-defined lighting sequence; and', 'incorporate the augmented reality indicia into the plurality of images., 'an augmented intelligence and knowledge (AIK) device, wherein the AIK device is configured to2. The system of claim 1 , wherein the emitor is a network-connected device.3. The system of claim 1 , wherein the emitor is a standalone device. This application claims priority to U.S. Provisional Application No. 62/574,517, titled “Personal Augmented Reality,” filed Oct. 19, 2017, the contents of which are incorporated herein by reference.The present disclosure relates to the field of electronic communications via augmented reality.Virtual Reality (VR) and Augmented Reality (AR) are evolving as a new means of communication between businesses and their consumer customers. Personal extension of a person's intelligence, in the form of smart phones, cameras, and other mobile devices, has become a ubiquitous element of the world. People commonly carry a collection of items: keys, glasses, wallets, pens, and similar items. At a minimum, these items allow individuals to augment and extend individual abilities to gain access to secure areas, see more accurate information, purchase things and/or provide identity, record information, and/or acknowledge personal ...

METHOD OF FREQUENCY ENCODING BEACONS FOR DISMOUNTED IDENTIFICATION, FRIEND OR FOE

The system and method for frequency encoded beacons for use in covert dismount identification, friend or foe and communications. Waveforms are capped at thresholds below human and conventional night vision detection. Waveforms are further modulated to identify dismounts as well as other information such as day and time, rank, health status, and the like. The beacons may operate at different wavelengths depending on whether they are used on ground, in air, or at sea. 1. A system for frequency encoded beacons , comprising: a transmitter master clock;', 'a beacon configured to generate an output signal; and', 'a modulation module configured to modulate the output signal from the beacon to produce an encoded output signal; and, 'a transmitter portion comprising,'} a receiver master clock;', 'a high speed detector configured to detect the encoded output signal; and', 'a demodulation module configured to demodulate the encoded output signal and decode the encoded output signal., 'a receiver portion comprising,'}2. The system for frequency encoded beacons according to claim 1 , wherein the transmitter master clock and the receiver master clock are in communication with each other via a radio frequency link.3. The system for frequency encoded beacons according to claim 1 , wherein the output signal from the beacon is at a wavelength greater than or equal to 700 nm.4. The system for frequency encoded beacons according to claim 1 , wherein the modulation module modulates the output signal to have a repetition frequency greater than 60 Hz.5. The system for frequency encoded beacons according to claim 4 , wherein the repetition frequency ranges from 10 kHz to 1 MHz to encode information into the output signal.6. The system for frequency encoded beacons according to claim 1 , wherein the modulation module modulates the output signal to have a duty cycle of a fraction of a percent.7. The system for frequency encoded beacons according to claim 1 , wherein the output signal from ...

NETWORK OF EXTREMELY HIGH BURST RATE OPTICAL DOWNLINKS

Traditional satellite-to-earth data transmission systems are constrained by inefficient relay schemes and/or short-duration data transfers at low data rates. Communication systems described herein achieve extremely high burst rate (e.g., 10 Gbps or greater) direct-to-Earth (DTE) data transmission over a free-space optical link between a spacecraft and a remote terminal, which may be a ground terminal or another space terminal. The optical link is established, for example, when the remote terminal is at an elevation of 20° with respect to a horizon of the remote terminal. In some embodiments, a data transmission burst contains at least 1 Terabyte of information, and has a duration of 6 minutes or less. The communication system can include forward error correction by detecting a degradation of a received free-space optical signal and re-transmitting at least a portion of the free-space optical signal. 1. A method of free-space optical communications , the method comprising:receiving data, from a spacecraft via a free-space optical channel, at a remote terminal at an altitude of less than about 100,000 feet at an average rate of at least 10 Tbit per day.2. The method of claim 1 , wherein receiving the data comprises receiving the data at an average rate of at least about 100 Tbit per day.3. The method of claim 1 , wherein receiving the data comprises receiving a free-space optical signal modulated at a rate of at least about 10 Gbps.4. The method of claim 1 , wherein receiving the data comprises receiving a free-space optical signal modulated at a rate of at least about 200 Gbps.5. The method of claim 1 , wherein the spacecraft is in low Earth orbit (LEO).6. The method of claim 1 , wherein the spacecraft is in medium Earth orbit (MEO).7. The method of claim 1 , further comprising:storing the data in a buffer on the spacecraft at an average rate of at least about 300 Mbps.8. The method of claim 1 , further comprising:storing the data in a buffer on the spacecraft at an ...

Free space optical data transmission using photodetector array

A free space optical communication system includes an optical receiver configured to receive a light beam from an optical transmitter wirelessly in free space. The optical receiver includes an array of photodetectors and an electrical circuit. The array of photodetectors is configured to receive the light beam and convert optical signals of the light beam into electrical current. The electrical circuit is electrically coupled to the array of photodetectors and is configured to combine electrical current from the photodetectors and output a voltage or current signal.

Trackable wireless optical communication

Embodiments provide a first communications device configured to communicate with one or more other communications devices over a wireless optical link. The first communications device may include a first communications structure configured to communicate with a second communications structure via the wireless optical link. The communications device may further include a micro-electro-mechanical systems (MEMS) mirror configured to direct an optical data signal sent over the wireless optical link and a controller configured to move the MEMS mirror based on feedback information to maintain the optical link between the first communications structure and the second communications structure.

Systems and methods employing coded light to dock aerial drones, self-driving cars and surface robots

Precision docking is one of the most important tasks for drones and surface robots to charge themselves and load/unload packages. Without accurate docking, surface robots and drones will miss their charging pad or charging contacts and cannot automatically charge themselves for later tasks. Described is a system using coded light to guide the precision docking process for drones and ground robots. More specifically, the system uses projectors to project temporal identifiers for space partitioned by pixel projections. Different space partition gets a different identifier. By using a simple light sensor on a drone or a ground robot, the drone or the ground robot can know its precise location in the space and therefore knows where to move for a precise docking. Depending on docking precision requirement, the coded light precision may be adjusted by using projectors with different resolutions.

DUAL-MODE IMAGING RECEIVER

A dual-mode imaging receiver (DMIR) can acquire and maintain SOA free-space optical communication (FSOC) links without a precision mechanical gimbal. Unlike other FSOC technologies, a DMIR can operate without precise spatial alignment and calibration of the transmitter's or receiver's spatial encoders (precision pointing) in static (fixed point to point) geometries. Instead, a DMIR uses electronic receive beam selection to acquire and track transmitters with coarse mechanical pointing and a single aperture. And because the DMIR can operate with just one aperture, it does not need a beacon at the transmitter since it does not transition from a wide field-of-view acquisition aperture to a narrow field-of-view detection and decoding aperture even in dynamic geometries. 1. A method of imaging and communicating with a an array of photodetectors operably coupled to a read-out integrated circuit , the method comprising:counting photons detected by a first photodetector in the array of photodetectors with a first pixel in the read-out integrated circuit;timing arrivals of photons detected by a second photodetector in the array of photodetectors with a second pixel in the read-out integrated circuit while the first pixel counts the photons detected by the first photodetector;synchronously reading the first pixel; andasynchronously reading the second pixel.2. The method of claim 1 , further comprising claim 1 , after synchronously reading the first pixel:timing arrivals of photons detected by the first photodetector in the array of photodetectors with the first pixel; andasynchronously reading the first pixel.3. The method of claim 2 , further comprising claim 2 , after asynchronously reading the second pixel:counting photons detected by the second photodetector in the array of photodetectors with the second pixel; andsynchronously reading the second pixel.4. The method of claim 1 , further comprising:reading the first pixel at a first rate; andreading the second pixel at a ...

Free Space Optical Communication System and Method

A free-space optical communication method is provided. An example method may include generating an optical frequency comb comprising a first tone and a second tone different from the first tone. The method may include modulating, by a first modulator of a first device, the first tone to generate a first signal comprising data. The method may include modulating, by a second modulator of the first device, the second tone to generate a second signal that is a phase conjugate of the first signal. The method may include transmitting, via free-space and to a second device, a communication signal having the first signal and the second signal.

NETWORK OF EXTREMELY HIGH BURST RATE OPTICAL DOWNLINKS

Traditional satellite-to-earth data transmission systems are constrained by inefficient relay schemes and/or short-duration data transfers at low data rates. Communication systems described herein achieve extremely high burst rate (e.g., 10 Gbps or greater) direct-to-Earth (DTE) data transmission over a free-space optical link between a spacecraft and a remote terminal, which may be a ground terminal or another space terminal. The optical link is established, for example, when the remote terminal is at an elevation of 20° with respect to a horizon of the remote terminal. In some embodiments, a data transmission burst contains at least 1 Terabyte of information and has a duration of 6 minutes or less. The communication system can include forward error correction by detecting a degradation of a received free-space optical signal and re-transmitting at least a portion of the free-space optical signal. 1. A method of free-space optical communications , the method comprising:receiving data, from a spacecraft via a free-space optical channel, at a remote terminal;detecting a correctable error in a first frame of the data;correcting the correctable error in the first frame at the remote terminal;detecting an uncorrectable error in a second frame of the data received at the remote terminal; andrequesting, by the remote terminal, a repeat transmission of the second frame of the free-space optical signal in response to detection of the uncorrectable error.2. The method of claim 1 , wherein the remote terminal is at an altitude of less than 100 claim 1 ,000 feet.3. The method of claim 1 , wherein receiving the data comprises receiving information at a rate of at least 10 Gbps.4. The method of claim 1 , wherein receiving the data occurs at a first rate and further comprising:receiving the repeat transmission at a second rate lower than the first rate.5. The method of claim 1 , wherein receiving the data occurs at a first power level and further comprising:receiving the repeat ...

PERSONAL AUGMENTED REALITY

The present disclosure provides systems and methods for enabling Personal Augmented Reality (PAR). PAR can include an emitor configured to receive data signals and emit the data signals as light signals. PAR can further include a smart device configured to receive the light signals emitted by the emitor. The smart device can process the light signals to yield a communication and display the communication on a screen. 1. A system , comprising:at least one emitor configured to emit a pre-defined lighting sequence; and acquire a plurality of images of an area including the at least one emitor;', 'detect the pre-defined lighting sequence from the plurality of images;', 'assemble augmented reality indicia based one pre-defined lighting sequence; and', 'incorporate the augmented reality indicia into the plurality of images., 'an augmented intelligence and knowledge (AIK) device, wherein the AIK device is configured to2. The system of claim 1 , wherein the emitor is a network-connected device.3. The system of claim 1 , wherein the emitor is a standalone device. This application is a continuation of U.S. application Ser. No. 16/165,823, filed on Oct. 19, 2018, now allowed, which claims priority to and the benefit of U.S. Provisional Patent Application No. 62/574,517, filed on Oct. 19, 2017, each of which is hereby incorporated by reference herein in its entirety.The present disclosure relates to the field of electronic communications via augmented reality.Virtual Reality (VR) and Augmented Reality (AR) are evolving as a new means of communication between businesses and their consumer customers. Personal extension of a person's intelligence, in the form of smart phones, cameras, and other mobile devices, has become a ubiquitous element of the world. People commonly carry a collection of items: keys, glasses, wallets, pens, and similar items. At a minimum, these items allow individuals to augment and extend individual abilities to gain access to secure areas, see more ...

RETROREFLECTORS PROVIDING INFORMATION ENCODED IN REFLECTED NON-VISIBLE LASER WHILE RETAINING VISIBLE LIGHT SAFETY PROPERTIES

Described are retroreflective marker devices, which encode information that can be read by optical sensors, such as LiDAR devices, and that do not detract from human safety. Also described are kits for retrofitting existing markers.

USPL-FSO Lasercom Point-to-Point and Point-to-Multipoint Optical Wireless Communication

Enhancements in optical beam propagation performance can be realized through the utilization of ultra-short pulse laser (USPL) sources for laser transmit platforms, which are can be used throughout the telecommunication network infrastructure fabric. One or more of the described and illustrated features of USPL free space-optical (USPL-FSO) laser communications can be used in improving optical propagation through the atmosphere, for example by mitigating optical attenuation and scintillation effects, thereby enhancing effective system availability as well as link budget considerations, as evidenced through experimental studies and theoretical calculations between USPL and fog related atmospheric events. 1. An optical communication transceiver system comprising:an ultra-short-pulse-laser (USPL) source operating in the wavelength range of 1.3 to 1.6 microns, the USPL source configured to generate a beam having a mode-locked pulse repetition rate comprising light pulses each having a duration of approximately one (1) nanosecond or shorter;an electronic switching element external to the said USPL source configured to provide an electronic clock signal suitable to control the mode-locked pulse repetition rate of the USPL source;an optical modulation element external to the said USPL source driven by an electronic data signal from the said external electronic switching element that is synchronized with the said clock signal and configured to apply a non-return to zero modulation signal to the said optical modulation element resulting in first data impressed on the said light pulses in a return to zero first modulated optical signal configured for transmission to a second optical communication transceiver system located remote from the optical communication transceiver system; andan optical receiver configured to receive a second modulated optical signal comprising second data from the second optical communication transceiver system.2. An optical communication transceiver ...

SINGLE CHANNEL LIGHT COMMUNICATION FOR VEHICLE REGISTRATION

Techniques and examples pertaining to single channel line-of-sight (LOS) communication are described. The transmitting end of the LOS communication involves direct modulation of a light emitted from a light emitter. The receiving end of the LOS communication involves receiving a video stream of the light emitter emitting the light, wherein the video stream comprises a plurality of video frames that are continuous in time. The receiving end of the LOS communication also involves converting the video stream to a binary string comprising a plurality of binary bits. Each of the binary bits corresponds to a respective one of the plurality of video frames, and the binary string contains a repeated binary pattern representing a message being conveyed. The receiving end of the LOS communication also involves extracting the binary pattern from the binary string and then decoding the binary pattern to obtain the message. 1. A method , comprising:receiving a video stream comprising a plurality of video frames continuous in time;converting the video stream to a binary string comprising a plurality of binary bits each corresponding to a respective one of the plurality of video frames, the binary string containing a repeated binary pattern representing a message;extracting the binary pattern from the binary string; anddecoding the binary pattern to obtain the message.2. The method of claim 1 , wherein the video stream records a vehicle traversing an environment claim 1 , the vehicle equipped with a light emitter emitting a signal relevant to the message claim 1 , and wherein the converting of the video stream to the binary string comprises:excerpting, from each of the plurality of video frames, a region of interest (ROI) of the respective video frame, the ROI including the light emitter;converting, for each of the plurality of video frames, the respective ROI to a binary image using one or more color filters; anddetermining, for each of the plurality of video frames, a value of a ...

ORIENTATION VARIATION MEASUREMENT SYSTEM, SATELLITE, AND ORIENTATION VARIATION MEASUREMENT METHOD

Parallel laser light beams are irradiated from different positions into a telescope. Beams of laser light are incident on a secondary mirror attitude detection mirror from different locations. Laser light detectors detect each beam of laser light reflected by the secondary mirror attitude detection mirror. A first attitude calculator determines an amount of attitude variation of a secondary mirror based on a result detected by the laser light detectors. The laser light detectors detect each beam of the laser light reflected by the primary mirror and the secondary mirror after entering the telescope. A second attitude calculator determines an amount of attitude variation of the primary mirror based on a result detected by the laser light detectors and the result detected by the laser light detectors. 1. A pointing variation measuring system , comprising:a secondary mirror attitude detection mirror disposed on a secondary mirror of a reflective condenser optical system, the reflective condenser optical system including a primary mirror and the secondary mirror;a laser light output unit to irradiate the reflective condenser optical system with at least two parallel beams of laser light from respective different locations and irradiate the secondary mirror attitude detection mirror with at least two additional beams of laser light from respective different locations;a first laser light detector unit to detect each beam of laser light reflected by the secondary mirror attitude detection mirror;a first attitude calculator to determine, based on a result detected by the first laser light detector unit, an amount of attitude variation that is a deviation between a reference attitude of the secondary mirror and a current attitude of the secondary mirror;a second laser light detector unit to detect each beam of laser light reflected by the primary mirror and the secondary mirror after entering the reflective condenser optical system; anda second attitude calculator to ...

MULTIPLE-INPUT METHOD AND APPARATUS OF FREE-SPACE OPTICAL COMMUNICATION

The present application is directed an optical gyroscope. The optical gyroscope includes a substrate including a first and a second waveguide disposed thereon. One or both of the waveguides may be doped with a rare-earth material. A crossing element is disposed between the first and the second waveguides to form a substantially orthogonal connection therebetween. The application is also directed to a system including an optical gyroscope. The application is further directed to a method of observing characteristics of the optical gyroscope. 1. A method comprising:collecting two or more free space optical beams onto an array of two or more spatially separated subapertures;outputting a sub-beam carrying information thereon from each subaperature;detecting each of the sub-beams to produce outputs;controlling amplitude and phase independently for each of the sub-beams according to multiple-input multiple-output processing; andrecovering multiple signals from the outputs.2. The method of claim 1 , further comprising:combining the outputs based on an assigned weight of the information associated with the outputs.3. The method of claim 2 , wherein the combining step is performed during a time interval.4. The method of claim 3 , wherein during each of a plurality of time intervals claim 3 , weighting the sub-beam outputs with respective weights derived from received pilot signals on the two or more sub-beams.5. The method of claim 4 , wherein the pilot signals are received via a multichannel receiver.6. The method of claim 1 , wherein the collecting step includes collecting two or more free space optical beams onto the subaperture array claim 1 , with each of the collected beams representing exit subapertures of a remotely situated optical transmitter.7. The method of claim 1 , further comprising:receiving the phase and amplitude of each sub-beam via a local oscillator.8. The method of claim 1 , wherein the controlling step is performed without a control loop.9. An apparatus ...

Systems and Methods for Adjusting Movable Lenses in Directional Free-Space Optical Communication Systems for Portable Electronic Devices

A directional free-space optical communication system includes a source device including a laser diode and an endpoint device including a photodiode. The endpoint device and the source device also include an adjustable optics subsystem that increases both angular and positional offset tolerance between the source device and the endpoint device. 120-. (canceled)21. A portable electronic device comprising:a housing;an aperture defined through the housing;a photosensitive element within the housing and aligned with the aperture, the photosensitive element comprising a photosensitive area at least partially circumscribing a central region of the photosensitive element;a movable lens between the photosensitive element and the aperture; anda controller coupled to the movable lens and configured to adjust a position of the movable lens in response to a power output of the photosensitive area.22. The portable electronic device of claim 21 , wherein:the photosensitive area is a first photosensitive element;the photosensitive area comprises a second photosensitive area; andthe first photosensitive area circumscribes the second photosensitive area.23. The portable electronic device of claim 22 , wherein:the first photosensitive area is segmented; andthe controller is configured to adjust the position of the movable lens in response to the power output of at least one segment of the first photosensitive area.24. The portable electronic device of claim 21 , wherein the aperture is defined through a sidewall of the housing.25. The portable electronic device of claim 21 , wherein the controller is configured to adjust the position of the movable lens to increase the power output of the photosensitive element.26. The portable electronic device of claim 21 , wherein the controller is configured to change a lateral position of the movable lens generally parallel to a surface of the photosensitive area.27. The portable electronic device of claim 21 , wherein the controller is ...

Wireless communication system and transmitter

In a wireless communication system, a transmitter that transmits data and a plurality of receivers wirelessly communicate with each other. The transmitter includes a first storage unit that stores first identification information of one of the receivers; a first communication unit that transmits the data; and a switching unit that switches a transmission destination of the data to another receiver having the first identification information stored in the first storage unit. The receiver includes a second storage unit that stores second identification information of a plurality of the transmitters; and a second communication unit that receives the data from the transmitter having the second identification information. Both the transmitter and the receiver store the first identification information and the second identification information to each other.

Methods and apparatus for tracking moving objects using symmetric phase change detection

An optical receiver including an optical resonator and a steering mechanism coupled to the at least one optical resonator is disclosed. The optical resonator is configured to receive a phase modulated input optical signal and to produce an intensity modulated output optical signal. An intensity modulation of the output optical signal is representative of the phase modulation of the input optical signal. The optical receiver further comprises an optical-electrical converter that detects the intensity modulated output optical signal and converts the intensity modulated output optical signal to an electrical signal, and signal processor that receives the electrical signal, performs symmetric phase change measurements based on the electrical signal, and provides a control signal to actuate the steering mechanism to steer the optical resonator to maintain normal incidence of the phase modulated input optical signal on a surface of at least one optical resonator.

Apparatus and method for line of sight laser communications

A line of sight laser communication system includes a laser to generate a laser signal with femtosecond pulses. A first grating spectrally disperses the femtosecond pulses of the laser signal. A programmable mask converts the femtosecond pulses of the laser signal into coded words. A second grating spectrally recombines the coded words of the laser signal. A telescope then launches the laser signal. The launched laser signal is received at a receiving telescope. A second laser generates a set of reference pulses. A non-linear crystal combines the set of reference pulses and the laser signal to create an output signal only when the laser signal and the reference pulses temporally coincide. A camera records the output signal.

Receiving and displaying device, information transmitting apparatus, light wireless communication system, reception display integrated circuit, information transmission integrated circuit, reception display program, information router and light wireless communication method

本发明提供一种接收显示装置、信息发送装置、光无线通信系统、接收显示用集成电路、信息发送用集成电路、接收显示程序、信息发送程序及光无线通信方法，在显示有所拍摄的视频图像的图像上，将与被障碍物遮蔽的信息发送装置有关的显示用信息，与信息发送装置的位置建立对应来进行显示。接收部按时间序列拍摄图像，从装置(100a)接收直发信息及转发信息，该直发信息含有与装置(100a)有关的信息，该转发信息含有与装置(100b)有关的信息、和表示装置(100b)与装置(100a)之间的相对位置的相对位置信息；测定部测定装置(100a)与自身装置(200)之间的相对位置；信息处理部将直发信息中所含有的装置(100a)的信息与所拍摄的图像上的装置(100a)的位置建立关联，进行重叠，并且，基于发光位置、转发信息中含有的相对位置信息、及装置(100a)的相对位置，来计算装置(100b)在所拍摄的图像上的坐标位置，并将转发信息中所含有的装置(100b)的信息与坐标位置建立关联，来进行显示。

Wide dynamic range optical receivers

A wide-dynamic range optical receiver amplifier is provided by using two separate amplifiers. The first amplifier is a low-impedance input, low-noise, high-gain amplifier, preferably a transresistance amplifier. An input resistor is chosen for the amplifier such that its resistance value is much greater than the input impedance of the first amplifier, resulting in insignificant change in input impedance when the first amplifier's output becomes saturated. A light-induced signal source is connected to the input resistor such that signal current from the light-induced signal source flows through the input resistor into the first amplifier input. A second high-input-impedance amplifier (preferably an FET-input buffer amp) is connected to receive the light induced signal source, either directly or through a resistive divider network. The difference in gain between the two amplifiers serves to extend the dynamic range of the optical receiver amplifier without switching input or feedback components, and without discontinuous response as the first amplifier becomes saturated. Other embodiments are directed to a further diode induced breakpoint, and to a front-end for a spot tracking system.

INTEGRAL COMMERCIAL COMMUNICATION NETWORK WITH USE OF RADIO FREQUENCY AND OPTICAL DATA EXCHANGE IN FREE SPACE

1. Интегральное устройство для передачи данных в свободном пространстве, содержащее:радиочастотный (РЧ) приемопередатчик диапазона миллиметровых волн (ммВ), имеющий антенну, при этом РЧ-приемопередатчик диапазона ммВ устанавливает РЧ-канал связи с удаленным устройством,приемопередатчик оптической передачи в свободном пространстве (FSO), имеющий источник света, наведенный преимущественно в том же направлении, что и антенна РЧ-приемопередатчика диапазона ммВ, при этом приемопередатчик FSO устанавливает канал связи FSO с удаленным устройством, ипозиционер в сборе, связанный как с РЧ-приемопередатчиком диапазона ммВ, так и приемопередатчиком FSO и ориентирующий приемопередатчики в направлении удаленного устройства.2. Интегральное устройство по п.1, в котором РЧ-приемопередатчик диапазона ммВ осуществляет передачу на радиочастотных волнах диапазона Е.3. Интегральное устройство по п.1, в котором РЧ-приемопередатчик диапазона ммВ осуществляет передачу сигнала данных с расширенным спектром по обратному каналу с целью облегчения повторной синхронизации с каналами, при этом обратный канал имеет волновой фронт повышенной чувствительности по сравнению с волновым фронтом с высокой скоростью передачи данных.4. Интегральное устройство по п.3, в котором сигнал данных, передаваемый по обратному каналу, обеспечивает данные работоспособности РЧ-канала и позиционера в сборе в реальном времени.5. Интегральное устройство по п.3, в котором сигнал данных, передаваемый по обратному каналу, обеспечивает данные управления интенсивностью оптического сигнала, передаваемого вторым интегральным устройством, при этом данные управления РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (51) МПК H04B 10/00 (13) 2013 155 236 A (2013.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ЗАЯВКА НА ИЗОБРЕТЕНИЕ (21)(22) Заявка: 2013155236/07, 22.05.2012 (71) Заявитель(и): АОПТИКС ТЕКНОЛОДЖИС, ИНК. (US) Приоритет(ы): (30) Конвенционный приоритет: 31.05.2011 US 13/149,804 (85) Дата начала рассмотрения заявки PCT на ...

Coded-light detection system including a camera, light sensor and augmented information display

本文公开了一种传感设备（100），其被适配成接收发射自多个光源（A,B）的光，所述多个光源（A,B）中的每一个发射包括光源识别符的光。所述传感设备（100）包括传感模块（110），该传感模块（110）包括被配置成至少接收发射自所述多个光源（A,B）的光的一部分的光选择单元（114）以及被配置成至少接收发射自所述多个光源（A,B）的光的一部分的光选择单元（114）。所述光选择单元（114）被适配成选择性地将由该光选择单元（114）接收的光的所选择部分传送到第二光学传感器单元（116）。以一种使得光的所选择部分与探测光的所述第一光学传感器单元（114）的多个光学传感器中的光学传感器相关联的方式来相对于所述第一光学传感器单元（112）设置所述光选择单元（114），或者反之亦可。

Infrared active alarm system with protection against high-energy electromagnetic interference

FIELD: computer engineering. SUBSTANCE: invention relates to the computer engineering. System consists of ground and underground parts. Ground part of the system forms a transmitting and receiving units, and the underground part of the system forms an electronic unit with a protective screen and a grounding electrode. Transmitting and receiving units form a light barrier by radiation and receiving N light beams. Transmitting unit comprises collimator lenses, and receiving unit – focusing lenses. Electronic unit comprises transmitters and receivers by number of light beams, as well as control and evaluation unit. Ground and underground parts of the system are connected by means of transport fiber-optic guides. Ground part of system is made with complete absence of electronic components and metal conductors, which provides stable protection against high-energy electromagnetic jamming. EFFECT: protection of infrared active alarm system from high-energy electromagnetic interferences. 1 cl, 1 dwg РОССИЙСКАЯ ФЕДЕРАЦИЯ (19) RU (11) (13) 2 712 421 C1 (51) МПК G08B 13/19 (2006.01) H04B 10/112 (2013.01) ФЕДЕРАЛЬНАЯ СЛУЖБА ПО ИНТЕЛЛЕКТУАЛЬНОЙ СОБСТВЕННОСТИ (12) ОПИСАНИЕ ИЗОБРЕТЕНИЯ К ПАТЕНТУ (52) СПК G08B 13/19 (2019.08); H04B 10/1121 (2019.08) (21)(22) Заявка: 2019112130, 22.04.2019 (24) Дата начала отсчета срока действия патента: Дата регистрации: 28.01.2020 (45) Опубликовано: 28.01.2020 Бюл. № 4 2 7 1 2 4 2 1 R U (56) Список документов, цитированных в отчете о поиске: RU 94003432 A1, 27.05.1996. RU 2629146 C1, 24.08.2017. US 9489812 B2, 08.11.2016. US 7738008 B1, 15.06.2010. US 2008/0029703 A1, 07.02.2008. (54) Инфракрасная активная система тревожной сигнализации с защитой от электромагнитных помех высокой энергии (57) Реферат: Изобретение относится к вычислительной содержит коллиматорные линзы, а приемный технике. Технический результат заключается в блок - фокусирующие линзы. Электронный блок защите инфракрасной активной системы содержит передатчики и приемники по числу ...

Multichannel on a single wave laser over wave division multiplexing in free space optics using phase masks

A system comprises a laser configured to produce a laser beam; a modulator optically coupled to said laser; and a phase mask optically coupled to said modulator. The phase mask may be configured to pre-distort a pre-existing wavefront to produce a pre-distorted wavefront to be transmitted over free space.

System for optical information transmission between a ground station and an aircraft

Optical micromirror assembly on a wireless network printed circuit board having in-package mirror position feedback

A printed circuit board micromirror assembly (10) is disclosed. The assembly (10) includes a mirror device (12) having a mirror surface (16) that can rotate in two axes. Actuation elements (14) are attached to the mirror device (12), to permit rotation of the mirror surface (16) responsive to the energizing of drivers (30). A spacer (22) connects between a printer circuit board (20) and mirror element (12) to permit sufficient movement of the mirror surface (16). In the alternative, the printed circuit board (20) includes a recess to form a gap to permit sufficient movement of the mirror surface (16). One or more sensors (40) are disposed under the mirror surface (16) to detect mirror orientation. According to another aspect of the invention, control circuitry is arranged under the mirror surface (16) to control the deflection of mirror element (36).

UNILATERAL TRANSMISSION SYSTEM

METHOD FOR INCREASING THE ILLUMINATION PRODUCED BY A LASER BEAM

L'invention concerne un procédé pour augmenter l'éclairement produit par un faisceau laser sur une cible, consistant à réfléchir ce faisceau sur un miroir déformable comprenant plusieurs éléments piézo-électriques. On augmente successivement la tension de polarisation de chacun des éléments 5, 6, 7 d'une tension continue prédéterminée, cette augmentation n'étant maintenue que si elle correspond à une augmentation de l'intensité lumineuse diffusée par la cible 15. Application à la focalisation sur une antenne de l'énergie d'un faisceau laser transmettant des informations. The invention relates to a method for increasing the illumination produced by a laser beam on a target, comprising reflecting this beam on a deformable mirror comprising several piezoelectric elements. The bias voltage of each of the elements 5, 6, 7 is successively increased by a predetermined DC voltage, this increase being maintained only if it corresponds to an increase in the light intensity scattered by the target 15. Application to the focusing on an antenna of the energy of a laser beam transmitting information.

METHOD AND DEVICE FOR LOCATING COMMUNICATION SOURCE, MOBILE COMMUNICATION SYSTEM USING SUCH A DEVICE

Method for locating an optical radiation source of the kind in which receivers like infrared receivers are used in an on/off mode, characterized in that it consists in: arranging at least one receiver of optical radiation at a point for which localization is sought, the receivers being arranged in order to discriminate separate zones or sectors in a space in which at least one determined transmitter of an optical radiation source is present; driving the transmitting emission from the transmitter in order to provide a recurrence of pulses having determined emission powers; locating the point associated with the receiver by detecting the state of the receiver or the receivers in response to the recurrence of pulses having determined emission powers.

Optical space communication equipment

(57)【要約】本公報は電子出願前の出願データであるた め要約のデータは記録されません。

ROTATING MISSILE EMITTING LIGHT PULSES.

Improvements to telecommunication systems

Communications system

ABSTRACT OF THE DISCLOSURE COMMUNICATIONS SYSTEM A communications system employs a laser for producing a beam of spatially-coherent, monochromatic, aperture-limited electromagnetic optical energy. The beam is modulated with intellegence-bearing information to develop wavefronts of mutually-aligned orientation. The beam is directed through free space to impinge upon a surface reflective of the energy and exposed in a non-confined free space to the impingement of the beam. The beam is also focused upon the surface with the impingement of the beam being within the depth of focus and substantially at the waist of the region of focus of the beam. The information in the beam, as reflected by the surface at an angle thereto and with a mutually-aligned orientation of those wavefronts maintained, is detected. Finally, the information demodulated from the detection is derived and utilized.

Retroreflectors providing information encoded in reflected non-visible laser while retaining visible light safety properties.

Se describen dispositivos marcadores retrorreflectantes, que codifican información que puede leerse mediante sensores ópticos, como los dispositivos LiDAR, y que no restan seguridad a las personas. También se describen kits para actualizar marcadores existentes.

Position measuring apparatus, position measuring method and position measuring program

Telescope mirror for high bandwidth free space optical data transmission

Optical mirror elements for high bandwidth free space optical communication are produced by an electroforming replication technique. Onto the precision surface of a mandrel that is a negative of the required optical surface a layer of metal is deposited forming an exact copy of the mandrel surface and is then separated to form the required optical element. During the production process the mandrel may be coated with a variety of materials that are then separated together with the electroformed optical element during the release step to form a monolithic structure that includes a reflective coating. The mandrel remains unchanged by the process and can then be re-used. The high cost of conventional polishing techniques is therefore limited to the production of the mandrel. The replication process results in the production of low cost optical elements suitable for high bandwidth free space optical data transmission.

Optical space transmitter and optical space transmission method for wavelength-multiplexed light

Provided is an optical space transmitter and an optical space transmission method, for wavelength-multiplexed light, capable of obtaining a wavelength-multiplexed signal by multiplexing optical signals having a plurality of wavelengths with a simple configuration and without requiring highly precise adjustment for optical axes and enhancing safety for a human body. The transmitter has a configuration for which light sources for outputting signal lights having wavelengths different from each other are arranged so as to irradiate an approximately identical portion of a diffusion plate, a diffuse light outputted from the diffusion plate is converted, by a radiation lens, into a light traveling with an angle suitable for transmission in a free space, and the converted light is passed out to the free space.

Rotating missile emitting light pulses

본 발명은 빛 펄스를 방출하는 회전 미사일에 관한 것이다. 본 발명은, 미사일의 세로축(L-L)을 기준으로 한 미사일의 회전 동작이 중단될 때, 상기 빛 펄스를 차단하기 위한 수단이 제공된다는 것을 특징으로 한다. 미사일, 회전 동작, 빛 펄스, 방출, 제어 장치

Network of extremely high burst rate optical downlinks

Traditional satellite-to-earth data transmission systems are constrained by inefficient relay schemes and/or short-duration data transfers at low data rates. Communication systems described herein achieve extremely high burst rate (e.g., 10 Gbps or greater) direct-to-Earth (DTE) data transmission over a free-space optical link between a spacecraft and a remote terminal, which may be a ground terminal or another space terminal. The optical link is established, for example, when the remote terminal is at an elevation of 20〬 with respect to a horizon of the remote terminal. In some embodiments, a data transmission burst contains at least 1 Terabyte of information, and has a duration of 6 minutes or less. The communication system can include forward error correction by detecting a degradation of a received free-space optical signal and re-transmitting at least a portion of the free-space optical signal.

Laser communications crosslink system

A laser communication crosslink system employs an n th order sigma delta modulator with a laser transmitter for communicating an analog input signal in binary form as a pulse width modulated signal, and employs a digital filter with a receiver for providing a digital output signal representing the value of the analog input signal. The pulse width modulated laser signal is communicated between the transmitter and receiver over a laser crosslink that may be fiber optic. The direct modulation using the sigma delta modulator with the transmitter and using the digital filter with the receiver reduces system complexity and power consumption.

Link architecture and spacecraft terminal for high rate direct to earth optical communications

A satellite in low-Earth orbit (LEO) or medium-Earth orbit (MEO) with a modern image sensor and/or other remote sensing device can collect data at rates of 10 Mbps or higher. At these collection rates, the satellite can accumulate more data between its passes over a given ground station than it can transmit to the ground station in a single pass using radio-frequency (RF) communications. Put differently, the sensors fill the spacecraft's memory faster than the spacecraft can empty it. Fortunately, free-space optical communications signals can carry far more data than RF communications signals. In particular, a spacecraft can transmit over 1 Tb of data in a single pass using burst wavelength-division multiplexed (WDM) optical signals. Each burst may last seconds to minutes, and can include tens to hundreds of WDM channels, each of which is modulated at 10 Gbps or more.

Method and system for wireless data transmission

Die Erfindung bezieht sich auf die leitungslose Datenübertragung zwischen mindestens einer ersten und einer zweiten Kommunikationseinrichtung (1, 1', 1"), von denen mindestens eine als Datenquelle (2) und mindestens eine andere als Datensenke (3, 3') fungiert. Es wird vorgeschlagen, eine von der mindestens einen Datenquelle (2) zu mindestens einer sich in direkter optischer Sichtverbindung zu der Datenquelle (2) befindenden Datensenke (3, 3') zu übertragende Datenmenge mit Nutzdaten unter Verwendung eines hybriden Übertragungsweges zu übertragen. Dies geschieht, indem ein Teil der Nutzdaten über einen Funkkanal (6, 6') und die übrigen Teile der Nutzdaten über einen gleichzeitig bestehenden leitungslosen optischen Direktkanal (7, 7') übertragen werden. Dazu werden die Nutzdaten von einem hierfür ausgebildeten Steuermodul (8) der mindestens einen Datenquelle (2) durch Modulation auf entsprechende Trägersignale auf den Funkkanal (6, 6') und den optischen Direktkanal (7, 7') aufgeteilt und nach ihrer Übertragung von einem dafür ausgebildeten Steuermodul (11, 11') der mindestens einen Datensenke (3, 3') bei der Demodulation der empfangenen Trägersignale wieder zusammengeführt. The invention relates to the wireless data transmission between at least one first and one second communication device (1, 1 ', 1 "), of which at least one acts as data source (2) and at least one other as data sink (3, 3') It is proposed to transmit an amount of data to be transmitted from the at least one data source (2) to at least one data sink (3, 3 ') in direct optical line of sight to the data source (2) using a hybrid transmission path. in that a portion of the payload data is transmitted via a radio channel (6, 6 ') and the remaining portions of the payload data via a simultaneously existing, cable-free optical direct channel (7, 7') a data source (2) by modulation to corresponding carrier signals on the radio channel (6, 6 &# ...

Laser communication system

An atmospheric optical communications link which compensates for variations caused by changes in the atmospheric transmission medium. The signal carrying light link includes a separate control laser at the receiver which communicates back to the primary transmitter to control it so that the primary beam light intensity is adjusted to compensate for atmospheric conditions. The reverse laser system is also used to remotely operate the control system at the transmitter and for other communication from the receiver station to the transmitter station.

METHOD FOR OPTICALLY TRANSMITTING DATA FROM A TRANSMITTING DEVICE TO A RECEIVER DEVICE AND ASSOCIATED DEVICES

Bidirectional optical space transmission equipment

Spin missile with controlled light pulse generation

Missil (2) som roterer om sin rotasjonsakse (L-L) mens den sender ut lyspulser (5). Det er anordnet midler for å bryte disse lyspulser når missilets (2) rotasjon om sin akse stanser. Missile (2) rotating about its axis of rotation (L-L) while emitting light pulses (5). Means are provided for breaking these light pulses when the rotation of the missile (2) about its axis stops.

Transmission device, communication system, and transmission level control method

Point-to-multipoint wide area telecommunications network via atmospheric laser transmission through a remote optical router

A point-to-multipoint bi-directional wide area telecommunications network employing atmospheric optical communication. The network comprises a primary transceiver unit, a plurality of subscriber transceiver units and an optical router. The primary transceiver unit generates a first light beam on which it modulates first data. The primary transceiver unit atmospherically transmits the first light beam to the optical router which demodulates the first data, modulates the first data on a second light beam and transmits the second light beam to the plurality of subscriber transceiver units in multiplexed manner. The subscriber transceiver units receive the second light beam and demodulate the first data from the second light beam. Conversely, the subscriber transceiver units atmospherically transmit a third light beam on which they modulate second data to the optical router which demodulates the second data, modulates the second data on a fourth light beam and transmits the fourth light beam to the primary transceiver unit. The primary transceiver unit atmospherically receives the fourth light beam and demodulates the respective second data from the fourth light beam. The optical router of the network comprises a secondary transceiver unit, a plurality of transceiver modules and an electronic router for routing data between the secondary transceiver unit and the plurality of transceiver modules to establish communication channels between the primary transceiver unit and the plurality of subscriber transceiver units. The secondary transceiver unit communicates with the primary transceiver unit and the transceiver modules communicate with the subscriber transceiver units. The transceiver modules comprise an X-Y beam deflector for deflecting the second and third light beams to a portion of the subscriber transceiver units in a time-multiplexed fashion. In an alternate embodiment of the optical router, the first light beam is redirected to the subscriber transceiver units ...

Method and device for locating a communication source and mobile communication system using one such device

Method for locating an optical radiation source of the kind in which receivers like infrared receivers are used in an on/off mode, characterized in that it consists in: arranging at least one receiver of optical radiation at a point for which localization is sought, the receivers being arranged in order to discriminate separate zones or sectors in a space in which at least one determined transmitter of an optical radiation source is present; driving the transmitting emission from the transmitter in order to provide a recurrence of pulses having determined emission powers; locating the point associated with the receiver by detecting the state of the receiver or the receivers in response to the recurrence of pulses having determined emission powers.

Method and device for controlling reception power level in free space optical communication system

(57)【要約】 【課題】 本発明は、指定した電力閾値を超過した時 に、送信される光ビームと受信光ファイバを、その送信 されるビームの焦点ではなく発散点で交差するように相 互に調整することによって、受信光ファイバファイバで の受信電力を低減する自由空間光通信システムを提供す ることを目的とする。 【解決手段】 少なくともビームの一部が受信光ファイ バ上に入射するまで、望遠鏡の長手方向軸に沿って送信 望遠鏡の焦点面の手前の点に送信光ファイバを移動する ことによって、送信されるビームを発散させることによ り、送信されるビームを発散させ、その結果、そのビー ムが受信望遠鏡上に入射する点の断面積を拡大させる。 したがって送信されるビームの単位面積当たり断面積電 力は低下し、これに相応して受信光ファイバ上に入射す る電力は低減される。

Method and device for realising an optical link with laser pulses

The method involves varying energy of successive impulses (4) of vertical cavity surface emitting laser (VCSEL) diode (3) according to an increasing function of time. A transmitter transmits the pulses to a receiver through an approximate direction. The transmitter is mounted on top of a missile. The missile speed is increased corresponding to the varying energy of the impulses. An Independent claim is also included for a device for realizing an optical link.

Rotating missile, emitting light pulses

发射光脉冲的旋转导弹。根据本发明，设计用于当该导弹(2)围绕该纵轴(L-L)的旋转运动停止时中断所述光脉冲(5)。

Wireless communication receiver using a totally internally reflecting concentrator

Optical receiver and a free-space optical communications using the same

A device for phase distortion compensation across an optical beam is provided. The device is a part of an optical receiver, which can be used in free space optical communications, remote sensing, optical imaging and others. 2 M inputs of the combiner interfere with each other via a system of tunable coupled waveguides. The phases in interleaved waveguides of the combiner are adjusted to maximize the resulting output signal. The combiner may be used for coherent communication in combination with a balanced 90° hybrid. Integrated solutions for the proposed device are provided.

Capturing device, capturing method, and capturing program

There have been problems that a capturing device requires an optical source having a large power output, and a scanning operation and a capturing operation must be alternately performed by the respective devices. A capturing device is provided with an optical receiver which receives a beam from outside as a reception beam, a reception beam capturing unit which performs a capturing operation by which the reception beam is introduced to the optical receiver, an optical transmitter which generates a transmission beam transmitted to the outside, a transmission beam scanning unit which performs a scanning operation of the transmission beams, and an optical circulator wherein the incidence of the reception beam and the exit of the transmission beam are performed at the same terminal.

System for multi-channel, diverged-beam optical wireless communication

An optical receiver is provided for a diverged-beam, free space optical communications system. The optical receiver includes a demultiplexer and a detector array. The demultiplexer includes a diffractive optic configured to receive an optical beam propagating in free space. The optical beam includes a plurality of optical carrier signals of respective wavelengths for a plurality of communication channels, and the diffractive optic is configured to spatially separate the optical beam by wavelength into the plurality of optical carrier signals. The detector array includes a plurality of optical detectors configured to convert the plurality of optical carrier signals into a respective plurality of electrical signals for the plurality of communication channels. The plurality of optical detectors includes at least twice as many optical detectors as optical carrier signals in the plurality of optical carrier signals.

Systems and methods for tiling free space optical transmissions

Systems and methods for optical narrowcasting are provided for transmitting various types of content. Optical narrowcasting content indicative of the presence of additional information along with identifying information may be transmitted. The additional information (which may include meaningful amounts of advertising information, media, or any other content) may also be transmitted as optical narrowcasting content. Elements of an optical narrowcasting system may include optical transmitters and optical receivers which can be configured to be operative at distances ranging from, e.g., 400 meters to 1200 meters. At such far-field distances, light beams emitted from the optical transmitters can be combined in a tiled fashion to create energy efficient and directable optical transmissions.

Method and apparatus for correcting wave-front distortion in free space optical communication system

公开一种自由空间光通信系统，根据该系统，用自适应光学巧妙处理发射望远镜的光学部件，对发射望远镜发射的光束的波前失真，进行预补偿。波前失真由接收望远镜上接收信号的像的至少一种特征变化所显示，例如接收信号振幅的下降。为了降低波前失真和相应地增加接收信号的合成振幅，于是使发射望远镜的反射镜变形。

Alignment of narrow beam transmission

A system of aligning narrow beam links encodes information on the transmitter indicative of the transmitter's position. When the receiver sees the transmitter's beam, it sends back information from the encoded information, and causes the transmitter to return to the position of alignment.

Position measurement device, position measurement method, and storage medium

位置測定裝置(100)係對複數個節點之中第1節點10傳送發光模式並指示發光，當檢測出根據指示之發光模式所進行的發光時，將檢測出發光的位置的資訊和第1節點10的資訊相互對應並記憶於記憶部。位置測定裝置(100)係在未檢測出根據指示之發光模式所進行的發光時，對第2節點10傳送和第1節點10所指示之發光模式不同的發光模式並指示發光。

Receiving system for free-space optical communications

An optical receiving system includes a Fresnel lens optically coupled to a detector via a tapered concentrator. The Fresnel lens is adapted to receive an electromagnetic signal and has a Fresnel focal point. The tapered concentrator has a first end surface area larger than a second end surface area. The detector has a sensing surface area oriented to receive the electromagnetic signal emerging from the tapered concentrator.

Rotating missile emitting light pulses

The invention concerns a rotating missile emitting light pulses. The invention is characterized in that means are provided to interrupt said light pulses (5) when the rotational movement (3) of the missile (2) about its longitudinal axis (L-L), stops.

Optical space transmission device using image sensor

Interactive vehicular communication system, particular between cars and its method of use

An interactive vehicle communication system, particularly for communication between motor vehicles, comprises a communication device (2) which may be placed on a stationary support (3) or a vehicle (4) traveling on a roadway and a receiver device (5), which may be placed on a stationary support (3) or a vehicle (4') traveling on a roadway and interacts with said communication device (2). The communication device (2) comprises first means (6) for interfacing with external data detection and/or generation means, emitter means (9) for generating and emitting a visible light-emitting laser beam (8) with predetermined solid angle (a) and range, digitizing means (7) for digitizing said laser beam (8) and control means (10) for appropriately conforming and orienting said laser beam (8), to allow it to selectively interact with vehicle driving in a predetermined drive direction, excluding the other vehicles driving in the opposite drive direction. The receiver device (5) comprises: receiving means (11) for receiving said laser beam (8) and second means for interfacing (12) with external transducer means.

Capturing device, capturing method, and capturing program

There have been problems that a capturing device requires an optical source having a large power output, and a scanning operation and a capturing operation must be alternately performed by the respective devices. A capturing device is provided with an optical receiver which receives a beam from outside as a reception beam, a reception beam capturing unit which performs a capturing operation by which the reception beam is introduced to the optical receiver, an optical transmitter which generates a transmission beam transmitted to the outside, a transmission beam scanning unit which performs a scanning operation of the transmission beams, and an optical circulator wherein the incidence of the reception beam and the exit of the transmission beam are performed at the same terminal.

Rotating missile, emitting light pulses

发射光脉冲的旋转导弹。根据本发明，设计用于当该导弹(2)围绕该纵轴(L－L)的旋转运动停止时中断所述光脉冲(5)。

Optical wireless multiport hub

An optical communication transmitter ( 13 ), receiver ( 15 ), and transceiver ( 17 ) having distinctive retro-reflective elements ( 30 ) and/or reflectivity that can be modulated. In one embodiment, the retro-reflective elements ( 30 ) can have different shapes or patterns ( 32 ), irrespective of rotation or size. In another embodiment, the retro-reflective elements can have their reflectivity modulated ( 42 ) to have a distinctive pattern in time. The solution also provides the capability to direct a remote optical receiver ( 15 ) to an available port ( 17 ) with an appropriate FOV. In the case where retro-reflective elements are only shape distinctive, a method may be used to direct the remote OWLink ( 15 ) to an appropriate port ( 17 ) of the hub ( 54 ). In addition to the hub ports ( 17 ) used for data links, additional hub ports called command ports ( 60 ) are added that are only used during the initial link setup of remote units. The hub ( 54 ) contains enough command ports ( 60 ) such that one command port covers each possible FOV. All command ports contain the same retro-reflective element shape that is very distinct from other hub shapes, e.g. the largest.

Coded-light detection system including a camera, light sensor and augmented information display

There is disclosed a sensing device ( 100 ) adapted to receive light emitted from a plurality of light sources (A, B), each of the plurality of light sources (A, B) emitting light comprising a light source identifier. The sensing device ( 100 ) comprises a sensing module ( 110 ) comprising a light selection unit ( 114 ) configured to receive at least a portion of the light emitted from the plurality of light sources (A, B) and a light selection unit ( 114 ) configured to receive at least a portion of the light emitted from the plurality of light sources (A, B). The light selection unit ( 114 ) is adapted to selectively convey a selected portion of light received by the light selection unit ( 114 ) to a second photo sensor unit ( 116 ). The light selection unit ( 114 ) is arranged relatively to the first photo sensor unit ( 112 ), or vice versa, in such a way that the selected portion of light is associated with a photo sensor of a plurality of photo sensors of the first photo sensor unit ( 114 ) detecting light.

Retroreflectors providing information encoded in reflected non-visible laser while retaining visible light safety properties

Described are retroreflective marker devices, which encode information that can be read by optical sensors, such as LiDAR devices, and that do not detract from human safety. Also described are kits for retrofitting existing markers.

Methods of improving line of sight wireless optical communication through adverse environmental conditions

A method of improving a signal-to-noise (S/N) ratio for a light signal transmitted by wireless optical communication through adverse environmental conditions, the light signal including a snake component and a ballistic component for carrying coded information, and a diffusive component that adds to background noise, the method comprising the steps of: encoding information to be transmitted by the light signal, wherein the light signal is one of a serial train of code pulses or a modulated light beam; selecting an appropriate wavelength for the encoded light signal; transmitting the encoded light signal though the adverse environmental conditions; receiving the encoded light signal; sorting the received encoded light signal to preferentially select the information carrying components and reduce the diffusive component; and detecting the sorted encoded light signal with a photo-detector.

An optical freespace communication system which selects emitters from an array to provide beam steering to a target based on a feedback signal

This application concerns acquiring and maintaining optical alignment between a source transmitter and target receiver in a free-space optical communication system. The source includes a plurality of optical transmitters, such as a VCSEL array or an LED array. Light from each emitter passes through a lens and illuminates a different area in the vicinity of the target device. Optical alignment between the source and the target can be achieved by selecting the appropriate emitter to use. In more detail, the source emits an activation pattern in which the elements which are illuminated varies as a function of time. For example, they could be illuminated individually in sequence, or using an iterative scanning approach, such as that of Figure 4. The target device provides a wireless feedback signal to the source in response to the activation pattern, and this is used to deduce the optimum emitting element for alignment with the target. The wireless feedback signal may be RF or optical.

Communication system and method to avoid laser-pulse broadening by multi-path effects

A laser pulse communication system (2000) that orients a polarization analyzer (2120) to a state determined based on received laser pulses. The oriented state of the polarization analyzer allows a transceiver (2100) to obtain a replica of the transmitted laser pulses that are unbroadened by multiple reflections caused by inter-transceiver media. The obtained replica, therefore, has an enhanced signal to noise ratio.