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| Number | Title | Issue Date |
| 7860399 | Host-independent link validation between optical communications modules Systems and methods for validating a data link between two communication modules, such as optical transceiver modules configured for bidirectional optical communication, are disclosed. In one embodiment a method according to the invention includes a first optical tr... | 12/28/2010 |
| 7787776 | Method and apparatus for using infrared sensors to transfer data within a security system A security system comprises a system control panel for monitoring at least one device on a network. An infrared (IF) sensor located on the network has an IR transmitter and an IR receiver. The IR transmitter transmits control data packets and the IR receiver detects... | 08/31/2010 |
| 7725037 | Optical switch based on parametric interaction A method and apparatus for switching at least one wavelength component of an optical signal beam from a first state to a second state. The phase characterizing the optical signal component is incremented by interaction with one or more escort beams in a non-linear m... | 05/25/2010 |
| 7437081 | System and method for providing two-way communication of quantum signals, timing signals, and public data A system and method for providing two-way communication of quantum signals, timing signals, and public data is provided. Generally, the system contains a first public data transceiver capable of transmitting and receiving public data in accordance with a predefined ... | 10/14/2008 |
| 7381939 | Optical cargo detection A detector for detecting cargo in a container has a controller block, a transmitter for transmitting light into the field of view, a receiver for receiving reflected light, and a threshold comparator for determining whether the received light meets a threshold for c... | 06/03/2008 |
| 7359634 | Light color recognition for optical connection verification Optical connection verification schemes that do not cause electromagnetic interference. An all-optical connection verification scheme exploits optical coding based on a standard color scale such as RGB (red, green, blue). An RGB LED source is used to launch a three-... | 04/15/2008 |
| 7286768 | Device for optical signal transmission An optical transfer device for transferring optical signals from a moveable part to a stationary part through an optical transfer medium in order to minimize distortions of the optical signal and increase the effective bandwidth of the signal transit path by minimiz... | 10/23/2007 |
| 7269321 | System and method of configuring fiber optic communication channels between arrays of emitters and detectors A system for configuring fiber optic communication channels between arrays of emitters and detectors comprises: an array of light emitters; an array of light detectors; a bundle of optical fibers disposed between the arrays of light emitters and light detectors for ... | 09/11/2007 |
| 7266304 | System for secure optical transmission of binary code An optical binary code transmission system comprising a sender comprising: means for generating a light beam; phase-shifter means; attenuator means whereby the intensity of the lateral modes is sufficiently low for there to exist at the most only one photon in the l... | 09/04/2007 |
| 7257323 | Signal-off detection circuit and optical receiving device using the same This invention offers a signal-off detection circuit allowing arbitrary setting of an issuing time (response time) of a signal disconnection alarm without being affected by a time constant of a direct current feedback circuit giving an offset voltage to an amplifier... | 08/14/2007 |
| 7245421 | Wavelength-division multiplexing optical communication system In a WDM optical communication system in which an optical lossy medium, optical amplifiers and Raman amplifiers for compensating for loss in the optical lossy medium are cascade-connected, means are provided for acquiring the state of use of a Raman amplifier, at a ... | 07/17/2007 |
| 7233739 | Optical bit stream reader system An all optical fiber bit stream reader system for examining the data contents of an optical fiber involving the conversion of a temporal timing signal into a spatially located signal is provided. The invention generally comprises generating and detecting a signal in... | 06/19/2007 |
| 7229017 | Laser locating and tracking system for externally activated tags A system for identification and tracking of a tag distributed in a room is presented. A laser base station is configured to scan laser beams through a portion of a room. A tag is configured to be reactive to incident laser beams scanned from the laser base station t... | 06/12/2007 |
| 7212740 | Transmitter-receiver device and a communication system The invention concerns a transmitter-receiver device (A, B) which comprises a receiver unit (RXA) for receiving optical signals and transmitter unit (TXA) for transmitting optical signals. Furthermore, the transmitter-receiver device (A, B) comprises a supervising u... | 05/01/2007 |
| 7151898 | Deterministic first and second order polarization mode dispersion compensator A polarization mode dispersion (PMD) feedforward compensator compensates first and second order PMD. An optical signal is provided to a PMD detector that senses first and second order PMD in the optical signal and produces control signals for the PMD compensator. Th... | 12/19/2006 |
| 7139484 | Signal transmission method in WDM transmission system, and WDM terminal, optical add-drop multiplexer node, and network element used in the same system Disclosed herein is a signal transmission method in a wavelength-division-multiplex (WDM) transmission system. The WDM transmission system comprises a first WDM terminal for transmitting a WDM signal, a second WDM terminal for receiving the WDM signal, and an optica... | 11/21/2006 |
| 7109865 | Tag interrogation with observable response signal An identification tag identifies a unique item from among a plurality of items with a similar appearance. Tagged items are searched by scanning the items with an interrogation signal. The tag emits an observable signal to indicate when it receives an identification ... | 09/19/2006 |
| 7095959 | Optical time division multiplexing/demultiplexing system A multiplexing/demultiplexing system has a multiplexor that includes a first plurality of optical switches having a plurality of outputs and a first plurality of optical delay elements coupled to the optical switches. A source of optical light is coupled to the dela... | 08/22/2006 |
| 7095772 | Extreme chirped/stretched pulsed amplification and laser Methods, devices and systems for generating ultrashort optical linear chirped pulses with very high power by amplifying the pulses so that their temporal duration is longer than the storage time of the amplifying medium. The additional gain factor is related to the ... | 08/22/2006 |
| 7095311 | Identification coding schemes for modulated reflectance systems An identifying coding apparatus employing modulated reflectance technology involving a base station emitting a RF signal, with a tag, located remotely from the base station, and containing at least one antenna and predetermined other passive circuit components, rece... | 08/22/2006 |
| 7072588 | Multiplexed distribution of optical power An optical power distribution system and method permits multiple power consuming devices to be selectively supplied with power using a single fiber optic line. In a described embodiment, multiple electrical power consuming well tools are interconnected to a fiber op... | 07/04/2006 |
| 7068932 | Method and system for automatic initialization of an optical network A method for automatic initialization of an optical network is provided. A network management system (NMS) performs remote determination of span losses and sets the operating points of network components. The initialization method comprises remotely and automaticall... | 06/27/2006 |
| 7068186 | Traffic monitoring The present invention provides an optical fiber sensor for traffic monitoring, which comprises a former consisting of an elongated plate, and an optical fiber wound onto at least one surface of the elongated plate. The elongated plate is flexible in a direction tran... | 06/27/2006 |
| 7010233 | Interface device for a fiberoptic communication network and methods of using such a device The invention concerns an interface device for a fiberoptic communication network. The interface device comprises an electric circuit arrangement 32, a first receiving section 34 for receiving a first transceiver module 24 and a second receiving... | 03/07/2006 |
| 6975812 | Optical communication device The detection light reflection function is given to PLC type LD, PD or LD/PD modules having light guides and optoelectronic chips (LD, LED, PD or APD) by forming a grating on the light guides which selectively reflects only the detection light. ... | 12/13/2005 |
| 6944407 | Method and apparatus for detecting radiation In analyzing radiation from a communication link, single-photon counting can be used to advantage especially at low levels of radiation energy, e.g. in the detection of optical radiation. Preferred detection techniques include methods in which (i) received optical r... | 09/13/2005 |
| 6935958 | Method and apparatus for machine location A method and apparatus for tracking and determining a location of a gaming machine or other item within a casino or hotel is disclosed. In one embodiment the method and apparatus utilizes a transmitter or emitter to provide a tracking signal that may be tracked by o... | 08/30/2005 |
| 6928916 | Infrared friend or foe identification system The present invention resides in an infrared identification system for identifying military vehicles as friendly or hostile. The infrared identification system includes a seed introduction system, in each friendly vehicle, that introduces trace quantities of a parti... | 08/16/2005 |
| 6925410 | Selecting a target device in a device network A device network to process signals has target devices, selecting devices that are movable relative to the target devices, and controllers. The controllers are in communication with the target devices and the selecting devices. Each of the selecting devices has a po... | 08/02/2005 |
| 6920372 | Audit monitoring and product drop system for retrofitting vending machines An audit monitoring and product drop system for retrofitting into an existing vending machine and a method of operating a vending machine is disclosed. A product drop sensor is provided to detect when a product to be dispensed drops through a product drop area of th... | 07/19/2005 |
| 6865347 | Optically-based location system and method for determining a location at a structure An optically based location system and method of determining a location at a structure include a lighting infrastructure having lights at a structure. Each light is configured to illuminate and to transmit a respective relative or absolute terrestrial position throu... | 03/08/2005 |
| 6775480 | Free space optical interconnect system A free space optical interconnect system tolerant to misalignments and utilizing redundant elements of a transmitter and/or a receiver is provided. The elements are arranged into clusters, the number of clusters being redundant, and the number of elements in each cl... | 08/10/2004 |
| 6704514 | Method of establishing and/or maintaining a wake mode for an electrical installation The invention concerns a method of establishing and/or maintaining a wake mode in an electrical installation, which in addition to at least one receiving device has at least one transmitting device that is connected through an optical bus system. So as no... | 03/09/2004 |
| 6650843 | Device for the optical transmission of signals Devices for providing optical signal transmissions between a transmitter unit and a receiving unit which is mobile relative to the transmitter unit. The units are optically coupled to each other via an optical transfer medium, and thus improve transmissio... | 11/18/2003 |
| 6509826 | Facility access control Method and apparatus for controlling access to or from a facility associated with providing services and/or sales of merchandise. The facility has an automatically operated, normally closed access gate and a scanner. Patrons may access the facility free o... | 01/21/2003 |
| 6470023 | Optical fiber position controller for multiple degrees of freedom A multiple channel optical fiber controller provides an optical fiber positioning control loop for each degree of freedom. Each channel represents a degree of freedom and remains independent from other channels by modulating the degrees of freedom with an... | 10/22/2002 |
| 6417947 | Free space light multibeam network bridge apparatus and methods A free space light multibeam network bridge apparatus receives free space light beam communication signals from free space light communication devices and routes the free space light beam communication signals to other free space light communication devic... | 07/09/2002 |
| 6310992 | Method and apparatus for interconnecting multiple modular devices in a communication system An apparatus (100), comprising multiple modular electrical devices (102, 104, 504) and an optical signal source (106), all coupled to an optical communication resource (108), and method for the interconnection of the multiple modular electrical devices (1... | 10/30/2001 |
| 6301034 | Pulsed laser microphone A microphone and method of use in which pulsed laser light is directed against a reflective diaphragm which is vibrated by sound waves thereby modulating the pulsed laser light reflected from the diaphragm. The modulated, pulsed laser light is transmitted... | 10/09/2001 |
| 6198528 | Laser-based three dimensional tracking system A three dimensional laser tracking and control system is disclosed. The system includes a laser beacon generating a three dimensional rotating and scanning laser beam that covers a three-dimensional area. Each mobile unit has identification number (ID) an... | 03/06/2001 |
