Abstract: Healthcare industry wireless audio systems include a wireless signal transmitter. The wireless signal transmitter generates wireless signals along a first path and a second path. Wireless audio systems illustratively also include a wireless signal receiver that converts the wireless signals into an audio signal.

Abstract: A visible light communication system having a transmission apparatus for modulating a transmission signal to a multiple-value number and a reception apparatus for demodulating a multiple-value modulated transmission signal is provided. The transmission apparatus includes a plurality of light emitters for emitting light in different colors, a chromaticity coordinates calculator for mapping a digital value to a chromaticity coordinates value, and a light intensity controller for controlling a light intensity of each of the light emitters based on the chromaticity coordinates value corresponding to the digital value. The reception apparatus includes a plurality of light receivers having different spectral characteristics, a chromaticity coordinates calculator for calculating a chromaticity coordinates value according to a received light intensity detected by each of the light receivers, and a demodulator for demodulating the digital value from the chromaticity coordinates value.

Abstract: 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.

Abstract: An optical receiving apparatus is provided on a mobile object and includes a receiving unit that receives an optical signal transmitted from a transmitting unit of a communication device disposed apart from the mobile object; and a blocking unit that blocks the optical signal when an incident angle of the optical signal relative to a disposition surface of the receiving unit becomes equal to or greater than a predetermined incident angle.

Abstract: An apparatus and method for allocating a bandwidth for up-stream data transmission to a plurality of Optical Network Units (ONUs) in an Ethernet Passive Optical Access Network (EPON) in which the ONUs are connected to a single Optical Line Terminal (OLT) are disclosed.

Abstract: An array of light beam emitter sections comprises: a substrate having a surface divided into an array of sections; and a grouping of light emitters disposed at each surface section and configured to emit light beams at different emission angles with respect to the surface. Also disclosed is apparatus for establishing optical communication channels between the array of light beam emitter sections and an array of light detectors. The apparatus comprises a controller coupled to the arrays of emitter sections and detectors for mapping at least one light emitter of each grouping with a light detector of the detector array to establish optical communication channels between the arrays based on the mappings.

Abstract: A high-speed optical communications cell is integrated at the interior of a two-dimensional imaging array. The combined receiver and imager carries out both photodetection (converting photons to electrons) and circuit functions (e.g. amplifying and integrating the signals from the photodetectors). The high-speed receiver cell comprises a photodetector and a high-speed amplification circuit, providing an electrical output which can follow a rapidly varying optical signal falling on the photodetector. The imaging array comprises an array of photodetectors and readout circuits, providing an electrical representation of the variation of light with position across the receiver surface. The presence of an imaging array surrounding the communications receiver, and in the same plane as it, allows a single optical path to be used for source acquisition and tracking as well as for data reception.

Abstract: A contents-delivery system has a contents-transmission device transmitting the contents, and a contents-reception device receiving the contents from the transmission device. A first communication device performs communication from the transmission device to the reception device via a high-directivity transmission carrier. A second communication device performs communication at least from the reception device to the transmission device. An optical position confirmation device permits it through optical irradiation to confirm that a position of the reception device with respect to the transmission device is within a range in which the first communication device can communicate. A position of the reception device is matched with the transmission device based on an irradiation position of visible light. It is thus possible to locate the reception device to a communication-enabled position if the reception device is directed against the transmission device.

Abstract: A communications system incorporates a transmitter a receiver. The transmitter includes an infrared light emitting diode (LED). The LED output is positive or negative luminescence, i.e. above or below an equilibrium background intensity level respectively, according to the polarity of its bias signal. The receiver contains a lens to focus light from the LED onto a diode detector, from which signals pass to an amplifier, decoder and printer. Output signals from the LED have an average intensity equal to the equilibrium background intensity level and a frequency greater than 100 Hz or byte rate greater than 100 bytes/sec. They are not discernible by conventional thermal infrared imagers with frame rates of 50 Hz or less because integration in such an imager renders them indistinguishable from background.

Abstract: A communication link for communicating data between a first opto-electronic equipment capable of providing an optical signal and a second opto-electronic equipment capable of receiving the optical signal is described. The communication link includes a first optical channel and a second channel. The first optical channel is preferably a high-speed optical channel for conveying information requiring high-speed connection and the second channel is preferably a slow channel providing, for example a low-power monitoring function. An opto-mechanical device for providing a communication link, including a first opto-electronic equipment for providing an optical signal, a second opto-electronic equipment for receiving the optical signal, a first optical channel and a second channel is also described.

Abstract: An LED is used as a light source of the emergency light. Data are normally received through a power line, demodulated at a modem section, and stored in a data memory. In an emergency, a change sectio switches the power line to a battery, and LED emits light and functions as the emergency light. At this time, the data stored in the data memory is read and demodulated at a light modulation section, and used to control blinking of the LED and the light intensity. Thereby, the data can be transmitted by the light. In an emergency, information on an emergency exit, an escape route, etc. can be received, if a mobile terminal having a light-receiving section receives the light from the emergency light.

Abstract: Information received from a wired network terminal on the wall face, or the like, is delivered as a light signal from a light transmitting/receiving section of a light communication unit. A lighting fixture is provided with a light transmitting/receiving section where light is received from the light communication unit in order to acquire information, and a light emitting element emits illumination light modulated according to that information. A terminal can acquire the information by receiving the illumination light at a light transmitting/receiving section. Since communication is performed from the light communication unit to the terminal by irradiating light into the space, a convenient illumination light communication system requiring no communication cable or laying work of optical fibers can be constructed.

Abstract: A digital camera 800 receives from lighting units 120a-120l lights temporarily changing in luminance and produces a coordinates data list 8031 of the lighting units. Decoding unit 804 reads change in luminance at each luminance-point coordinates of the lighting unit to decode information. It is judged based on the decoded information of a data format 900, whether plural luminance-point coordinates having the same guidance point ID information 902 are found. When the plural luminance-point coordinates having the same guidance point ID information are found, a location of the plural luminance-point coordinates is analyzed to draw and display a circumscribed polygon having its vertices at these coordinates on a through image in an overlapping manner. A hatched area is set inside the circumscribed polygon and the decoded information is displayed within the hatched area.

Abstract: A communication device uses one or two stacks of reflective deflectors to steer the electromagnetic waves carrying signals received and transmitted through a single telescope/aperture device. The signals outside the device may be circularly polarized while inside the device they are linearly polarized most of the time. The deflectors within each stack are transparent to the signals steered by the deflectors behind them. Since the deflecting wave band may shift with the changing angle of incidence of the signals due to steering, the wave bands are sufficiently spaced apart. When the signals impact the deflectors at nearly normal angles, the wave bands can be made more narrow. When more than one stack of deflectors is used, the spacing between the wave bands within one stack may be utilized by another stack.

Abstract: A method and apparatus for conditioning a wireless data communication path for the transmission of a signal wave are presented. The apparatus comprises a conditioning wave transmitter positioned to transmit a conditioning wave along at least a portion of the wireless data communication path. The conditioning wave forms a conditioning envelope about the data communication path. The wavelength of the conditioning wave is selected to remove undesirable particles from the wireless data communication path. As a result, the wireless data communication path is conditioned to provide for improved data communication. The conditioning wave may be transmitted co-, counter-, or bi-directionally with respect to the signal wave, and may form a second data channel.

Abstract: An interconnect system has an optical transmitter mounted on a first circuit board and an optical receiver mounted on a second circuit board. The optical receiver can be nominally aligned to receive an optical signal through free space from the optical transmitter. Further, the optical receiver includes one or more light detectors, and an optical antenna coupled to direct incident light into the one or more light detectors.

Abstract: A free space optical communication system is described that comprises a receiver node and a transmitter node communicating to each other via a control data communication channel and an information data communication channel operating at a wavelength region different from the wavelength region of the control data communication channel. The receiver node includes a receiver unit configured to receive an information data signal provided by the transmitter node through the information data communication channel, and to recover information from said information data signal; an interrogator unit configured for generating and radiating an interrogation data signal through the control data communication channel in order to initiate and terminate an information data communication session between the receiver node and the transmitter node; and a receiver node controller configured for controlling operation of the receiver unit and the interrogator unit.

Abstract: A transmitter apparatus to transmit information to a receiver apparatus by using visible light emitted from a plurality of light sources includes at least a first light source to transmit user data; at least a second light source to transmit a pilot signal; and at least a third light source to transmit notice information that is necessary for receiving the user data in the receiver apparatus, the third light source being placed at a position determined by the position of the second light source.

Abstract: A bidirectional transceiver assembly includes a VCSEL structure that emits light at a defined wavelength on a substrate structure. A photodetector receives the light. A hole structure is formed on the substrate structure to allow the light from the VCSEL structure to be emitted so as to form an optical path.

Abstract: A high-speed (Gbps), free space optical communication system is based on spectral encoding of radiation from a wide band light source, such as a laser. By using partially coherent laser beams in combination with a relatively slow photosensor, scintillations can be suppressed by orders of magnitude for distances of more than 10 km. To suppress the intensity fluctuations due to atmospheric turbulence, a source with partial transverse coherence in combination with slow response time photodetector is used. Information is encoded in the spectral domain of a wideband optical source by modulation of spectral amplitudes. A non-coherent light source with wide spectrum (an LED, for example) may be used for high-speed communication over short (less than about a mile) distances.

Abstract: A visible light communication apparatus is constituted with a transmitter for illuminating and projecting visible light on which an information signal is superimposed from a lamp fitting and a receiver for receiving the visible light to take out the information signal superimposed on the visible light. The transmitter modulates a transmission information signal, driving a light projecting element of the lamp fitting so as to superimpose the transmission information signal on the visible light of the lamp fitting, thereby radiating white light containing a blue light component as visible illumination light. The receiver receives the white visible light containing the blue light component radiated from the transmitter and generates a receiving information signal from the light receiving signal on a receiving circuit. A blue light photodiode which receives blue light at the highest sensitivity to output a light receiving signal is used as a light receiving element of the light receiving unit.

Abstract: A system and method of free-space optical satellite communications includes a ground station and transceiver for transmitting and receiving an optical communications signal. Adaptive optics at the ground station are operative with the transceiver for determining the shape of any distortions in the wavefront of the optical communications signal and compensating at the ground station for the distortions. A satellite includes a transceiver for transmitting and receiving the optical communications signal and includes adaptive optics for determining the shape of any distortions in the waveform of the optical communications signal and compensating at the satellite for the distortions.

Abstract: Method and system for processing a modulated WIR input signal. A digital device includes an input receiving circuit. This circuit receives the modulated WIR input signal and detects a modulation carrier pulse burst in the WIR input signal and generates a valid pulse signal. A pulse generating circuit is operatively coupled to the input receiving circuit and generates a pulse signal of a specific duration based in part on the pulse burst.

Abstract: In order to prevent a spectrum of a wavelength channel from becoming narrower, a device according to the present invention includes a light dividing section capable of dividing a wavelength spectrum in an input light beam and outputting a plurality of divided light beams, which are spatially separated and have wavelength spectrum portions different from each other, and a wavelength-to-special-position-converter capable of spatially multiplexing the wavelength spectrum portions of the plurality of divided light beams from the light dividing section.

Abstract: The main power source unit of an image read-out device supplies power to an laser diode (LD) power supply unit of an electronic cassette through a contact. The LD power supply unit supplies the supplied power to a laser diode (LD), as power used for emitting laser light, and also supplies a portion of the supplied power to an LD power supply unit of the image read-out device through a contact. The power supplied to the LD power supply unit of the image read-out device is supplied as power for emitting laser light to an LD of the image read-out device. When there is a change in the relative position of the casings of the electronic cassette and the image read-out device, the contact and electrical continuation of the contacts breaks and laser light stops being emitted from the LDs.

Abstract: There are provided a first modulation section for performing low-speed digital modulation of first data; a second modulation section for performing high-speed digital modulation of second data; a first light transmitting section for emitting/quenching visible light in accordance with an output signal of the first modulation section to transmit a visible light signal which conveys the first data; and a second light transmitting section for changing the intensity of the infrared light in accordance with an output signal of the second modulation section to transmit an infrared light signal, which conveys the second data, in parallel with the visible light signal.

Abstract: An Optical bench communicates light through free space in a plurality of trenches formed in the bench, each of the trenches formed by deep ion reactive etching and defined by two opposing side walls, such that the free space is between the opposing side walls. An exemplary embodiment has a first trench operable to receive the beam of light and operable to communicate the beam of light through the free space in the first trench; an angled reflection side wall operable to receive the beam of light routed through the first trench and operable to reflect at least a portion of the beam of light; and a second trench operable to receive the portion of the beam of light reflected from the angled reflection side wall and operable to route the portion of the beam of light through the free space in the second trench.

Abstract: A transceiver module having intergrated eye diagram opening functionality for reducing jitter is describe. The transceiver module may transmitter eye opener and a receiver eye opener integrated in a single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modes, bypass features, bit error rate testing, and power down mode.

Abstract: An optical apparatus comprises a phase comparator detecting a phase shift between a changing point of data transmitted through an electro/opto converter and a changing point of data received through an opto/electro converter, a delay controller and a variable delay circuit controlling a delay of the transmitted data so that the phase shift detected becomes equal to a value which minimizes a receiver sensitivity degradation due to crosstalks between a transmitter portion and a receiver portion.

Abstract: In a data transmission method according to an exemplary embodiment, a data transmitter, which is capable of outputting a dummy light for judging an optical axis and a signal light having a beam spread smaller than that of the dummy light on the same optical axis, outputs the dummy light for scan so as to go across a photoreceiving part of a data receiver. When the dummy light having a predetermined optical level or more is optically received, the data receiver informs the data transmitter of reception chance and prepares for receiving the data. The data transmitter outputs the data carried by the signal light to the data receiver according to the information indicating the reception chance from the data receiver. The data receiver receives the data by optically receiving the signal light from the data transmitter.

Abstract: Disclosed is a method for transmitting data in a wireless visible light communication system, the method including the steps of transmitting a pilot signal for obtaining channel state information according to each channel from a transmitter to a receiver, and transmitting a pilot response signal containing channel state information according to each channel from the receiver to the transmitter; controlling, by the transmitter, a data rate according to the pilot response signal, transmitting, by the transmitter, data to the receiver, with data rate information inserted into a header and controlling, by the receiver, a data rate according to each channel by making reference to data included in the header information.

Abstract: Free space optical communication methods and systems, according to various aspects are described. The methods and systems are characterized by transmission of data through free space with a digitized optical signal acquired using wavelength modulation, and by discrimination between bit states in the digitized optical signal using a spectroscopic absorption feature of a chemical substance.

Abstract: A transmitting unit includes a transmitter for transmitting signals of coded information about a position close to the unit in a space substantially unreachable by a satellite-based navigating system so as to provide a receiver arranged on a moving object present in the space with the position information for determining the position of the object. The transmitter is adapted to normally be in an inactive non-transmitting state, and the unit further includes a detector adapted to detect movement of an object within a space and activate the transmitter to transmit signals only when movement of an object in the space is detected.

Abstract: A system and method for providing an in-building navigation service using VLC are provided, in which transmitters control lamp modules to generate visible light signals each in a combination of different wavelengths as information for a navigation function, a mobile terminal receives visible light signals from a plurality of lamp modules that illuminate an area where the mobile terminal is located, location information about a current location of the mobile terminal is acquired through the visible light signals received from the plurality of lamp modules, and navigation information including information that matches the location information to map information is displayed on the mobile terminal.

Abstract: An optical transceiver is disclosed, in which a noise attributed to the large current switching in the optical transmitter and superposed on the signal line in the optical receiver is effectively eliminated. The optical transceiver includes a noise generator and a delay circuit. The noise generator generates a compensation signal from the input signal of the optical transmitter. The compensation signal, having the same waveform and the phase with the noise superposed on the signal line, is input in the main amplifier. Since the phase of noise is delayed by the delay circuit, the main amplifier may cancel the noise as the common mode noise.

Abstract: An illumination apparatus is used in the light communication system. The apparatus receives electricity from a commercial alternating-current power source and a light-emitting element in the apparatus emits light. The zero passage time of commercial alternating-current power source is detected and signals are transmitted from illumination apparatus, or intercommunications between terminals of communication equipment take place, during a specific reserved time that is in synchronization with this zero passage time.

Abstract: A transmitter apparatus transmits transfer data having a predetermined amount to a receiver apparatus. The apparatus includes a data packet generating section dividing the transfer data into multiple divisional data sets; an error detection/correction code adding section adding an error detection code (error detection information) by which an error in the divisional data sets is detected to each of the divisional data sets; and a transmitter section transmitting the multiple divisional data sets to which the error detection code is added all together. Thus, data transfer is very reliable. It takes less time to transfer data.

Abstract: The present invention relates to an optical fiber access network and a communication protection method thereof. The optical fiber access network comprises an optical fiber communication system, a wireless communication system, a communication service switch device (8), a second optical network unit (6) and protection optical fiber (91, 92). The protection optical fiber (91, 92) is used to protect the optical fiber line between the optical line terminal (1) and the optical branching divider (2) in the optical fiber communication system. At the same time, the wireless communication system is introduced to protect the optical fiber between the optical branching divider (2) and the optical network unit (3) in the optical fiber communication system. The protection optical fiber or the wireless communication system is used to protect the communication service respectively when there is a broken failure between the optical line terminal (1) and the optical network unit (3) in the optical fiber communication system.

Abstract: The invention relates to a wireless optical data transmission system and a method for wireless optical transmission of data. The system comprises a data stream generator for generating at least two parallel data streams (18.1, 18.2, 18.3). The parallel data streams are transmitted by a number of separate optical transmitting devices (8, 9, 10) separately by emitting first optical signals. The system further comprises a corresponding number of detectors (19, 20, 21) for detecting the first optical signals and converting them into respective second signals (26.1, 26.2, 26.3) and an error correction unit (31) for correcting the amended second signals. Within a predistortion (29) unit each second signal (26.1, 26.2, 26.3) is amended individually with respect to a transmission channel used.

Abstract: An optical data-bus system for wireless signal transmission between two modules of an appliance, where the modules are each equipped with at least one transmitter and/or at least one receiver, and where the transmitter is a laser diode, and the receiver is a photo-element, with which a laser beam emitted by the laser diode is aligned. Each transmitter and/or receiver of a module is encapsulated within a metallic housing, and, in the region of the transmitter and/or of the receiver, the metallic housing provides a window made of a material, which is transparent for the laser beam. A processor, which converts electrical control signals into modulation signals, which are suitable for optical modulation, or respectively which converts optical modulation signals into electrical control signals, is provided for each module.

Abstract: A measurement probe 1 for a machine tool has a housing 4/5 incorporating a window 6 which allows the optical transmission or receipt of signals from/to infrared transmitters 12 or receivers 13. To obviate the need to mount the transmitter and receiver components on an external surface of the housing, they are surface mounted to a circuit board 8?.

Abstract: A node for use in a wireless communication network that facilitates alignment of the node with other nodes in the network and a method for aligning the node. The node includes mounting fixtures that enables the mounting of GPS receivers and a tiltmeter to obtain position and bearing information for the node. The node contains alignment features that enable the positioning of an optical transmitter/receiver pair in the node using the data obtained from the GPS receivers and tiltmeter.

Abstract: A wireless communication method between mobile terminals using visible light and a mobile terminal therefore are disclosed. The method includes: periodically transmitting device discovery signals for searching for a visible light communication device when there is a request for a visible light communication; transmitting only reference clock signals between the device discovery signals; and connecting a link to a receiving terminal to transmit data when a response signal for the device discovery signal is received from the receiving terminal.

Abstract: A frequency-agile optical transceiver includes a shared local oscillator (LO), a coherent optical receiver and an optical transmitter. The LO operates to generate a respective LO optical signal having a predetermined LO wavelength. The coherent optical receiver is operatively coupled to the LO, and uses the LO signal to selectively receive traffic of an arbitrary target channel of an inbound broadband optical signal. The optical transmitter is also operatively coupled to the LO, and uses the LO to generate an outbound optical channel signal having a respective outbound channel wavelength corresponding to the LO wavelength.

Abstract: A system for supplying power wirelessly to a remote mobile device including (i) a transmitting unit for directing radiation into the region of the mobile device, the transmitting unit having a gain medium with a front surface directed towards the space, and a retroreflector on its back surface, and (ii) a receiver unit connected with or attached to the mobile device for receiving radiation transmitted from the transmitting unit. The receiver unit includes (i) a retroreflector for reflecting part of the radiation received from the transmitting unit back in the direction of the transmitting unit, where it is amplified and retransmitted back in the direction of the receiver unit, and (ii) a power detection element for absorbing that part of the radiation not reflected by the retroreflector, and converting it to electrical power for use by the mobile device. Modulation of the transmitted beam enables it to transmit data also.

Abstract: A method and apparatus are provided for transferring a plurality of satellite signals through an optical communication network. The method includes the steps of selecting a frequency of a local oscillator signal within a guardband between a left polarization signal and a right polarization signal of a first satellite signal of the plurality of satellite signals, frequency shifting the first satellite signal upwards in frequency by the selected frequency. The method further includes the steps of combining the frequency shifted satellite signal with a second satellite signal of the plurality of satellite signals and modulating a optical carrier with the combined signals, transferring the modulated optical carrier to a receiver through an optical fiber and decoding the first and second satellite signals within the receiver.

Abstract: An optical receiver includes a first light receiving element to convert an optical signal to an electric signal and to output the electric signal from one end. A light receiving element row is connected to the other end of the first light receiving element to supply electric power to the first light receiving element. The light receiving element row includes a plurality of second light receiving elements connected in series.

Abstract: An electronic system includes a first circuit board having a first optical element and a second circuit board having a second optical element positioned to electronically communicate with the first optical element over free space. The system also includes a cold plate having openings positioned to enable the optical communications over free space is positioned between the first circuit board and the second circuit board. The system further includes a condenser and a fluid conduit containing a cooling fluid configured to absorb heat through the cold plate and to convey the heat to the condenser, where the fluid conduit connects the cold plate and the condenser.

Abstract: A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in a single circuit. The transceiver module may also include serial control and various other integrated components. Other functionalities that may be integrated on the transceiver module include loopback modes, bypass features, bit error rate testing, and power down modes.

Abstract: The present invention provides an optical transceiver that enables to reduce the crosstalk from the optical transmitter to the optical receiver. The regenerator of the optical transceiver includes two main amplifiers, a selector, a selector control, and a re-shaper for shaping the receiving signal selected by the selector. The first main amplifier provides a first amplifier and a delay circuit connected in upstream to the first amplifier. The second main amplifier provides a second amplifier and a delay circuit connected in downstream to the second amplifier. The selector selects, based on the phase difference between the receiving signal Rx and the transmitting signal Tx, the output from the first main amplifier or that from the second main amplifier.