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| Number | Title | Issue Date |
| 7889997 | Portable wireless terminal for visible light communication A portable wireless terminal for performing visible light communication with other devices through free space includes an optical detector for generating an electrical signal after photoelectrically converting some of optical signal input from free space and outputt... | 02/15/2011 |
| 7403712 | Matrix time division multiplex (MTDM) interrogation Embodiments of present system encompass: a plurality of laser sources that produce a plurality of respectively different optical wavelengths; a matrix switch having a plurality of inputs operatively coupled to the plurality of laser sources, each of the plurality of... | 07/22/2008 |
| 7366423 | System having multiple agents on optical and electrical bus A system includes multiple agents coupled to an optical bus for transmission of high speed signals and to an electrical bus for transmission of low speed signals. The agents can be memory modules, such as DIMMs. An optical connector housing for coupling the agent to... | 04/29/2008 |
| 7362258 | Transponder detection system using radio and light wave signals A target object detection system for detecting a target object using a detector and a tag on the target object; the tag includes a radio wave receiver receiving radio wave from the detector; a light receiver receiving a light signal from the detector; a receipt sign... | 04/22/2008 |
| 7336898 | Fibre optic communications network A security system for controlling access to an enclosed conduit along which runs fiber optic cable, the conduit having a cover for access to the cable, the system having a communications receiver and a modulator responsive to an output of the receiver for coupling n... | 02/26/2008 |
| 7317876 | Medium access control for retro-reflectors A method, a device and a system for communications to and from a retro-reflector device (302) is provided. The retro-reflector device (302) receives a first frame (400) encoded in an input beam (106). The retro-reflector device (302 | 01/08/2008 |
| 7312862 | Measurement system for determining six degrees of freedom of an object A measurement system for determining six degrees of freedom (α, β, d, φ, χ, ψ) of a reflector (2) or of an object (3) on which the reflector is arranged, comprises an angle- and distance measurement apparatus (1), e.g. a laser tracker, oper... | 12/25/2007 |
| 7308207 | Method for identifying an interrogated object using a dynamic optical tag identification system An interrogator identifies an interrogated object using a light transceiver and a dynamic optical tag associated with the interrogated object. The dynamic optical tag receives an output light beam from the light transceiver and controllably reflects the light beam b... | 12/11/2007 |
| 7271949 | Multi-wavelength light source and wavelength division multiplexing system using the same A multi-wavelength light source includes an amplifier for generating light over a wide wavelength range; and, an optical fiber grating including a plurality of gratings formed on an optical fiber in in parallel with each other, thereby dividing the light inputted fr... | 09/18/2007 |
| 7254340 | Apparatus and method for tracking optical wavelength in WDM passive optical network using loop-back light source An optical wavelength tracking apparatus and method in a wavelength division multiplexed (WDM) passive optical network (PON) in which a central office (CO) having a multi-frequency light source is connected to a plurality of optical network units (ONUs) having loop-... | 08/07/2007 |
| 7187838 | System and apparatus for radial optical distribution Embodiments of the invention include an apparatus and system for managing and radially distributing optical fibers from a first location, such as a central office, to a plurality of destination locations, such as homes within a neighborhood. The apparatus includes a... | 03/06/2007 |
| 7184670 | Telemetry system and method for acoustic arrays A telemetry system includes a plurality of acoustic sensors for receiving acoustic information and generating analog signals based on the received acoustic information. A first plurality of subsystems is coupled to at least a subset of the plurality of acoustic sens... | 02/27/2007 |
| 7173426 | Optical link for transmitting data through air from a plurality of receiver coils in a magnetic resonance imaging system An optical data link is provided for optically transmitting in free space data from a plurality of receiver coils in a magnetic resonance (MR) imaging system. This free space (e.g., through-the-air) optical data link provides a tether-less (i.e., no bundles of physi... | 02/06/2007 |
| 7139483 | Optical communication system An optical communication system is formed by connecting a base station to user stations. Each user station has a transmitting section for upstream communication. The base station has a light source which supplies transmission light used for upstream communication. | 11/21/2006 |
| 7113707 | Dynamic optical interconnect This invention provides a dynamic interconnection system which allows to couple a pair of optical beams carrying modulation information. In accordance with this invention, two optical beams emanate from transceivers at two different locations. Each beam may not see ... | 09/26/2006 |
| 7095962 | Optical transmission system An optical transmission system of the present invention includes input ports to which laser beams are respectively input, condensing, input optical elements, input reflectors corresponding one-to-one to the input optical elements each, output reflectors, output opti... | 08/22/2006 |
| 7054563 | Multi-channel optical communication system that controls optical reflection for each channel and optical transmitting and receiving apparatus therefor A multi-channel optical communication system includes an optical transmitting apparatus and an optical receiving apparatus. The optical transmitting apparatus has a retroreflector and a modulator for modulating light reflected by the retroreflector according to a tr... | 05/30/2006 |
| 7035546 | 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 h... | 04/25/2006 |
| 6978093 | Free space optical communication network The present invention provides a method and network for communicating over free space links. The network includes a plurality of buildings, each housing at least one of a residence and a business. Pluralities of free-space optical links are established, where each o... | 12/20/2005 |
| 6970653 | Fiberoptic system for communicating between a central office and a downstream station A fiber optic system for communicating between a central office and a downstream station is described. The central office has a TX unit, an RX unit and a continuous wave (“CW”) laser. Each station has an RX unit and a tunable filter coupling the RX unit to the c... | 11/29/2005 |
| 6650840 | Method for identifying faults in a branched optical network A method for identifying faults in a branched optical network having a central office optically connected to a plurality of optical network units by a plurality of optical paths. The method involves transmitting an optical signal from the central office t... | 11/18/2003 |
| 6624916 | Signalling system A signalling system includes first and second signalling devices. The first signalling device including a retro-reflector modulator, having a lens, a modulator and a reflector, and being operable to receive, modulate and reflect the modulated signal back ... | 09/23/2003 |
| 6583772 | Linked scanner imaging system and method A device for image transmission includes a first scanner at a first location and a second scanner at a second location, with an optical fiber linking the scanners. The first scanner scans the first location and couples light from the first location to the... | 06/24/2003 |
| 6563620 | Quasi-dispersionless optical fiber transmission, dispersion compensation and optical clock A method of transmitting optical pulses in a transmission media includes separating a coherent source optical pulse into a plurality of mutually coherent pulses, and producing a series of mutually coherent optical pulses from the plurality of pulses. The ... | 05/13/2003 |
| 6560386 | Tunable optical add/drop multiplexer Optical signal devices, wavelength division multiplexer/demultiplexer optical devices, and methods of employing the same in which the core layer includes a grating and is comprised of a material whose refractive index is tuned so that the grating reflects... | 05/06/2003 |
| 6559993 | Optical router for a light-based communication network 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 transce... | 05/06/2003 |
| 6493123 | Modulated-retroreflector based optical identification system An optical identification system for identifying a vehicle. The system comprises a laser source for generating a transmitted beam and a reflector in optical communication therewith. The reflector is operative to reflect the transmitted beam to thereby gen... | 12/10/2002 |
| 6344846 | Optical retroreflective remote control An optical retroreflective remote control used in combination with electronic apparatus, such as a VCR or television set is disclosed. The controlled apparatus includes a light or radiation source and a retroreflected light detector as well as means for d... | 02/05/2002 |
| 6317237 | Voice monitoring system using laser beam An infrared laser beam (B1) is irradiated from a transmitter (100) toward a window pane (410) of a building (400), and a reflected laser beam (B2) is received by a receiver (200). A laser spot (Q) picked up by a CCD camera is displayed on respective targe... | 11/13/2001 |
| 6137611 | Suppression of coherent rayleigh noise in bidirectional communication systems Low-noise, bidirectional communications in a fiber optic cable is achieved by coupling a first end of the cable to an optical power source having an inherently broad spectral width. A second end of the cable is coupled to an optical detector having a dete... | 10/24/2000 |
| 6128116 | Retroreflective elevator hoistway position sensor Retroreflective tape 28, 29 disposed on select positions on an elevator guide rail 13 is sensed by infrared transceivers 24, 25 disposed on an elevator car 10 to provide a signal indicative of the elevator as being at a vertical position in a hoistway des... | 10/03/2000 |
| 5966227 | Active cooperative tuned identification friend or foe (ACTIFF) An optical identification friend-or-foe (IFF) system for vehicles comprises an active cooperative identification friend-or-foe (ACTIFF) system wherein a responder optical head is located on each friendly vehicle. That responder optical head comprises a nu... | 10/12/1999 |
| 5909299 | Microsatellite system for high-volume orbital telemetry Detailed mapping of the magnetosphere is made possible by deploying hundreds of attitude-impervious microsatellites, in the form of small corner reflectors with piezoelectric mirror surfaces, from a single mother satellite at spacings of as little as 1 km... | 06/01/1999 |
| 5467942 | Temperature sensing optical system An optical sensing system for sensing the temperature at a first location, including: electro-optical unit for producing a modulated optical signal and a light guide unit for receiving and transmitting the modulated optical signal along an optical path. T... | 11/21/1995 |
| 5434668 | Laser vibrometer identification friend-or-foe (IFF) system A friend-or-foe (IFF) identification system (10) comprises a laser generator (12) for generating and transmitting a laser beam (B). A beam splitter (16) divides the laser beam into two beams. One of the beams (B1) is directed along a reference path (P). T... | 07/18/1995 |
| 5422645 | Delayed laser retroreflector pulse technique and system A laser interrogator system and technique establishes low-observable idenication friend or foe (IFF) between two distinct positions. An interrogating laser transmits a laser pulse from a first position to a passive retroreflector fiber optic bundle locat... | 06/06/1995 |
| 5365266 | Video imaging method and apparatus for audience participation An audience response system in which each audience member is provided with a reflective device (or other radiation source) which is, for example, green on one side and red on the other side. Light from a spotlight is reflected from the reflectors and imag... | 11/15/1994 |
| 5361157 | Bidirectional light transmission system and optical device therefor A bidirectional light transmission system comprises a transmitting station having a light source for intensity-modulating a transmission signal, a first light branching portion for branching intensity-modulated light of the light source in a predetermined... | 11/01/1994 |
| 5355241 | Identification friend or foe discriminator An IFF device comprises a beam generator for directing an unmodulated beam at a target. The target has a plurality of retro-reflectors mounted on it. These retro-reflectors have internal reflecting surfaces for reflecting the unmodulated beam penetrating ... | 10/11/1994 |
| 5294075 | High accuracy optical position sensing system An optical position sensing system for sensing the position of a displaceable element. An electro-optical unit outputs a modulated optical signal and a chirped rf signal. The envelope of the modulated optical signal has a phase that has a known relation t... | 03/15/1994 |
