17 results about "Optical wireless" patented technology

The invention relates to the technical field of intelligent peripherals, in particular to a user-oriented interaction information expansion method, which comprises the following steps that: each keycap acquires displacement and pressure, generates an event packet, uploads the event packet through an optical wireless link, and obtains a clock and supplies power; constructing a keycap graph by a master controller, obtaining an intention vector through graph convolution and pooling, inputting the intention vector into a cyclic network to generate a pixel matrix and a phase matrix, and downlink after Bernoulli sparse coding; performing key cap side orthogonal matching pursuit decoding and four-round gradient optimization, and outputting a differential pixel set, a differential phase set and a synchronization mark; the master control refreshes the digital micromirror array and the ultrasonic phased array in a differential manner, locks a frame-level time sequence through a synchronization pulse, compensates link delay and hardware drift in real time based on Kalman filtering, and keeps an optical-acoustic alignment error to be less than 100 microseconds; degradation monitoring enables a link to be automatically switched to a pre-carved character layer and to be quickly recovered when the link is abnormal, and a keyboard interaction information expansion scheme with low delay and high consistency is provided.

To provide a safety monitoring system for wireless power transmission applied to a laser beam system for supplying power to and charging a portable electronic device.SOLUTION: In a safety monitoring system, a power delivery system includes a transmitter having a beam generator to transmit power to a receiver that converts the beam to power. A system control unit stores a known signature categorized by a predetermined parameter associated with one or more undesirable situations and data from a sensor, compares the stored data with the signature, and performs one or more responses based on the comparison. The power delivery system also includes a hazard detection system 4003 adapted to monitor the transmitter and the system control unit to switch the beam generator to a safe state at the time of detection of a malfunction of the transmitter and control unit, and further to prevent exposure of a person to a beam intensity above a predetermined safe level.SELECTED DRAWING: Figure 3

A system for transmitting laser power to a remote receiver, comprising a laser diode, an optical system for collimating and focusing the laser beam to the receiver, and a scanning system for directing the beam towards the receiver. The beam has a wavelength of 1150 to 1550 nm, a power exceeding 300 mW, an emitter width of 15 to 250 μm, is a spatial multimode beam, and more than 50% of its power is transmitted via TEM. 00 In the mode, less than 15% of its power, and a higher-order TEM with more than 20 (n+m) nm The mode has a laser oscillation cavity with a Fresnel number between 0.01 and 20, and a low-speed axis M of less than 15. 2 , high-speed axis M less than 1.5 2 It has a high-speed axial divergence angle exceeding 60°. The collimated laser beam has a single lobe when imaged up to a range of 10 meters.

A system for measuring power of a laser beam includes a substantially opaque housing from which the laser beam is directed through an exit aperture. The housing includes: a beam splitter configured to transmit a primary portion of the laser beam through the exit aperture and to reflect a secondary portion of the laser beam; a diffuser element positioned such that a reflected secondary portion of the laser beam impinges thereon; at least one detector element in optical communication with the diffuser element, the detector element providing a signal in response to diffused light of the secondary portion of the laser beam impinging thereon; and an absorber element positioned such that a portion of any light that enters the housing through the exit aperture and is reflected by the beam splitter impinges on the absorber element and is substantially absorbed.

The invention belongs to the technical field of optical communication, and particularly discloses an optical fiber-visible light converged communication system for transmitting end signal reverse probabilistic shaping. According to the method, carrier waves are injected into a base band, a single side band signal is formed, a KK receiving scheme meeting the minimum phase condition is combined with an RPS strategy of distributing constellation probability to an outer ring, efficient and steady recovery of a mixed link receiving signal under the conditions of low signal-to-noise ratio and limited peak power is achieved, and the method has the advantages of being simple in structure and convenient to operate. And the phase reconstruction reliability is improved by setting a proper carrier signal power ratio. The method overcomes the defects of insufficient stability of peak constraint and phase recovery when strong carrier waves and low signal-to-noise ratio coexist in a traditional direct detection link and high peak-to-average power ratio and aggravated mutual information degradation of conventional probability shaping under the low signal-to-noise ratio, has higher noise immunity and spectral efficiency, and can be applied to the field of wireless communication. The method is a feasible scheme for a 6G indoor optical wireless access and optical fiber wireless optical integrated network.

Methods and systems for enabling secure communication between a wireless charging system and at least one external device. The wireless charging system comprises at least one transmitter for supplying receiver(s) with wireless power. The external device may be used to control the wireless charging system by updating configuration files, instructing the transmitter as to which receiver to supply power to, and to supply billing information to enable receiver(s) to pay for wireless charging. The wireless charging system may provide the external device with data, such as receiver details, or images of the vicinity around the transmitter or receiver. The system only carries out the above if a key is presented to the wireless charging system. The key may be a physical key inserted into a component of the wireless charging system, such as into the transmitter, or a numeric key received by the wireless charging system.

The invention discloses a method and a system for improving the capacity of a digital-analog hybrid optical fiber wireless system based on time-interleaved index modulation. According to the TI-IM (Time-Interleaved Index-Modulated) DA-RoF method, at a sending end, a communication signal is decomposed into a digital component and an analog residual component after being subjected to DA modulation, and an additional index bit is mapped into a time interleaving selection vector which is used for controlling the arrangement sequence of the digital component and the analog component in a plurality of time slots; and at a receiving end, synchronous recovery of the index information and the original communication data is realized through time de-interleaving and joint judgment based on a maximum likelihood criterion. According to the method, the signal dimension is expanded while the signal-to-noise ratio advantage brought by a DA-RoF system is kept, the communication capacity is remarkably improved, and the method has good system compatibility and engineering realizability and is suitable for future high-speed mobile forward pass and 6G optical wireless fusion networks.

To provide a wireless laser power system having a safety system.SOLUTION: The failsafe wireless power transmission system comprises a transmitter (761) and a receiver (762), wherein the transmitter comprises a receiver function monitoring unit, a transmitter function monitoring unit and at least two sensors (767 to 772) and has at least one low emission state (773) and at least one high emission state (774), wherein the high emission state comprises higher emissions and a more complex safety system. The transmitter is prevented from switching from either the low emission state to the high emission state upon detection of a malfunction of the receiver control unit, a malfunction of the transmitter control unit, a likelihood of human-accessible emissions from the system being greater than a predetermined level, or a mismatch between results from at least two of the sensors.SELECTED DRAWING: Figure 7

1. A system for use on a vehicle, the system including: an electronic controller; a sensor device; an optical wireless transmitting device; a cable infrastructure having a first end connected to the electronic controller; and an interface connected between a second end of the cable infrastructure and the sensor device and the optical wireless transmitting device, the interface operable to select, on a time-shared basis, between i) using the cable infrastructure for a first function of forwarding upstream data sensed by the sensor device to the electronic controller, and ii) using the cable infrastructure for a second function of forwarding downstream data from the electronic controller to the optical wireless transmitting device to be optically transmitted from the optical wireless transmitting device, the interface configured to make the selection dependent on a motional state of the vehicle.

A handheld light communication system and a device incorporating components of a handheld light communication system are provided. The handheld light communication system includes: a transmitter configured to transmit light; and a receiver configured to determine data encoded in the light transmitted by the transmitter. The receiver includes: a light sensor for sensing the light transmitted by the transmitter; analog circuitry configured to generate a conditioned analog signal based on a light signal that is output from the light sensor; and a digital signal processing device configured to recover a clock of the light transmitted by the transmitter by processing the conditioned analog signal and to decode the data encoded in the light using the clock.

The invention discloses an optical modulation link control method, device and system, and the method comprises the steps: transmitting two paths of optical carrier signals to a polarized light coupling and delay module in the forward direction through corresponding optical circulators, carrying out the coupling and delay control of the two paths of signals, and outputting two paths of modulated light with the polarization planes kept orthogonal; the modulated light enters the Faraday optical rotation reflection module, and is reflected to form two paths of reflected light signals which are reversely transmitted, the two paths of reflected light signals are transmitted back to the polarized light coupling and delay module for secondary delay and partial wave control, and two paths of independent reflected light signals are output; the two paths of independent reflected light signals are reversely incident to a photoelectric detector through corresponding optical circulators respectively, and the photoelectric detector performs photoelectric conversion and signal amplification on the two paths of reflected light signals respectively and outputs two paths of delay microwave frequency discrimination signals for radio-over-fiber phase noise measurement. According to the invention, time synchronization of two paths of delay microwave frequency discrimination signals for phase noise measurement is realized, and the signals are independent and low in crosstalk.

The invention discloses an asynchronous code division multiple access underwater wireless optical communication system multi-user access method based on optical wireless access point direction self-adaption, and belongs to the technical field of wireless optical communication. According to the method, user azimuth angle estimation and communication are synchronously realized at an OAP end by utilizing a detector array, and a receiving end direction self-adaptive mechanism is implemented based on multi-user detection and arrival angle information so as to maximize the system capacity. And a multi-user access control strategy is formed by further combining a dynamic code word distribution protocol. According to the method, the difficulty in underwater clock synchronization is overcome, the throughput, the number of users and the fairness are improved by optimizing the OAP space orientation, and an effective solution is provided for practical application of UOWC multi-user communication.

A system for measuring power of a laser beam includes a substantially opaque housing from which the laser beam is directed through an exit aperture. The housing contains a beam splitter configured to transmit a major portion of the laser beam through the exit aperture and reflect a minor portion of the laser beam, a diffuser element positioned such that the reflected minor portion of the laser beam impinges thereon, at least one detector element in optical communication with the diffuser element, the detector element providing a signal in response to diffused light of the minor portion of the laser beam impinging thereon, and an absorber element positioned such that any portion of light that enters the housing through the exit aperture and is reflected by the beam splitter impinges on the absorber element and is substantially absorbed.

A system for measuring the power of a laser beam, comprising an essentially opaque enclosure, from which the laser beam is directed through an exit aperture. The enclosure contains a beam splitter configured to transmit a major part of the laser beam through the exit aperture, and to reflect a minor part of the laser beam; a diffuser element positioned such that the reflected minor part of the laser beam impinges thereon; at least one detector element in optical communication with the diffuser element, the detector element providing a signal in response to the diffused light of the minor part of the laser beam impinging thereon; and an absorber element positioned such that that part of any light entering the enclosure through the exit aperture and reflected by the beam splitter, impinges on the absorber element, and is essentially absorbed.

System for optical wireless transmission of power to a power receiving device, typically located in a mobile electronic device. The transmitter has an optical resonator with end reflectors and a gain medium between them, producing a beam. The frequency of the beam is chosen so that it is absorbed by almost all commonly used transparent organic materials. A beam steering unit on the transmitter can direct the beam in any of a plurality of directions, and on the receiver the beam is absorbed through a low reflective surface by means of a photovoltaic power converter. The bandgap of this power converter is chosen to be smaller than the gain medium. The receiver has a voltage converter comprising an inductor, a storage device and a switch. A beam steering controller ensures that the beam is projected on the receiver.

This optical wireless power supply system comprises: a light source unit provided with a plurality of light source elements; and a photoelectric conversion unit provided with a plurality of photoelectric conversion elements. A light-emitting surface of the light source unit and a light-receiving surface of the photoelectric conversion unit are arranged to face each other. The arrangement of the plurality of photoelectric conversion elements on the light-receiving surface is the same as the arrangement of the plurality of light source elements on the light-emitting surface.