Presence Detection Patents (Class 398/151)
  • Patent number: 9917644
    Abstract: An exemplary system for communicating data includes a light source that emits light and a processing device that receives and encodes data into a communication signal. A modulator modulates light emitted by the light source, wherein the modulation is imperceptible to the human eye, and the modulated light includes the encoded data. The modulation of the transmitted light is imperceptible to a human eye. A receiving device receives the modulated light and processes the light to decode the encoded signal and obtain the data.
    Type: Grant
    Filed: October 9, 2013
    Date of Patent: March 13, 2018
    Assignee: BOOZ ALLEN HAMILTON INC.
    Inventors: Vadim Ravich, Andrew Linn, Allan O. Steinhardt
  • Patent number: 9894427
    Abstract: In some embodiments, a system includes a set of servers, a set of switches within a switch fabric, and an optical device. The optical device is operatively coupled to the set of servers via a first set of optical fibers. Each server from the set of servers is associated with at least one wavelength from a set of wavelengths upon connection to the optical device. The optical device is operatively coupled to each switch from a set of switches via an optical fiber from a second set of optical fibers. The optical device, when operative, wavelength demultiplexes optical signals received from each switch from the set of switches, and sends, for each wavelength from the set of wavelengths, optical signals for that wavelength to the server from the set of servers.
    Type: Grant
    Filed: November 11, 2015
    Date of Patent: February 13, 2018
    Assignee: Juniper Networks, Inc.
    Inventors: Pradeep Sindhu, Roberto Marcoccia, Theodore J. Schmidt, George R. Sosnowski, Christian Malouin
  • Patent number: 9490912
    Abstract: A system for transmitting routable energy packets includes an optical power source and a processing circuit. The optical power source is configured to generate an optical power packet having optical energy, generate an optical data packet comprising routing information configured to control a route of the optical power packet, and transmit the optical power packet and the optical data packet via a conduit. The processing circuit is configured to generate the routing information to be transmitted within the optical data packet, and control a transmission by the optical power source.
    Type: Grant
    Filed: October 31, 2013
    Date of Patent: November 8, 2016
    Assignee: Elwha LLC
    Inventors: Roderick A. Hyde, Edward K. Y. Jung
  • Patent number: 9285190
    Abstract: A system and method for performing correlation processing for identifying an object of interest in a cloud of remote objects of different types comprises receiving RF and IR measurement data including rotational, translational bias and noise errors and determining and removing biases by minimizing a weighted distance metric. Correlation pairing metrics are then determined according to a maximum likelihood criteria. This method produces a correlation solution that minimizes the effects of biases and random noise while accounting for the statistical properties of the parameters being estimated.
    Type: Grant
    Filed: September 13, 2013
    Date of Patent: March 15, 2016
    Assignee: Lockheed Martin Corporation
    Inventors: Jonathan A. Boardman, Jeffrey B. Boka, Naresh R. Patel
  • Patent number: 8989592
    Abstract: An optical fiber transmission system adapted to provide a remote passive identification of components deployed in said transmission system, wherein each component comprises an associated passive optical identification unit adapted to provide identification of a component type of the respective component on the basis of a received optical identification signature carried in an optical identification signal to said component.
    Type: Grant
    Filed: December 22, 2012
    Date of Patent: March 24, 2015
    Assignee: ADVA Optical Networking SE
    Inventors: Roy Bowcutt, Sorin Tibuleac
  • Patent number: 8897650
    Abstract: A sending/receiving system includes first and second sending/receiving apparatuses. The first sending/receiving apparatus includes a first sending section that sends link establishment information via first transmission channels. The second sending/receiving apparatus includes a second sending section, link establishing sections, and a controller. The second sending section sends link establishment information to the first sending/receiving apparatus via a second transmission channel. Each of the link establishing sections is provided for a corresponding one of the first transmission channels and establishes a link in the corresponding first transmission channel on the basis of the link establishment information.
    Type: Grant
    Filed: August 20, 2012
    Date of Patent: November 25, 2014
    Assignee: Fuji Xerox Co., Ltd.
    Inventor: Hirokazu Tsubota
  • Patent number: 8837938
    Abstract: A method and a device for monitoring a cable system in the field of communications are provided. An optical signal emitted by an optical source to a transmission link of the cable system is divided into two paths of optical signals, in which one path of optical signals serve as local coherent light, and the other path of optical signals are transformed by multipath frequency shift to multiple paths of detection optical signals of different frequencies. A monitoring result is obtained by performing coherent detection, with the local coherent light, on the returned optical signals of the multiple paths of detection optical signals of different frequencies. The device includes an optical source, a multipath frequency shift module, and a coherency module.
    Type: Grant
    Filed: April 19, 2011
    Date of Patent: September 16, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Lei Liu, Guangyong Zhang, Zhiyong Feng
  • Patent number: 8831426
    Abstract: A high data rate optical signal is inverse multiplexed into a multitude of lower-rate tributaries, each of which is coded by its unique OCDM code, and the combined coded tributaries are injected into a common phase scrambler. Coherent summation of these optically encoded tributaries pass through a shared phase or phase and frequency scrambler before exiting the secure location. The setting of the scrambler acts as the key. The authorized recipient with the correct key retrieves the ones and zeros of the several decoded signals.
    Type: Grant
    Filed: September 12, 2012
    Date of Patent: September 9, 2014
    Assignee: Telcordia Technologies, Inc.
    Inventors: Shahab Etemad, Janet Jackel, Sarry Habiby
  • Patent number: 8805196
    Abstract: A communications link for carrying data between a transmitter and a receiver operates according to a communications protocol (such as PCI Express (PCIe)) specifying a reduced-power link operating state in which the transmitter generates a reduced-amplitude electrical output signal and the receiver is to operate in a power-save mode. The communications link includes an electro-optical link and a circuit coupling an output of the transmitter to an electrical input of the electro-optical link. The circuit is configured to detect initiation of the reduced-power operating state and to send messages to the receiver to maintain a normal amplitude of an optical signal on the electro-optical link.
    Type: Grant
    Filed: September 30, 2010
    Date of Patent: August 12, 2014
    Assignee: Teradyne, Inc.
    Inventor: Marlon Zbigniew Kasprzyk
  • Patent number: 8744269
    Abstract: An optical measurement instrument comprises operational modules (101-107) that are interconnected via a digital communication network (110). Each operational module comprises a transceiver (111-117) connected to the digital communication network and arranged to support a pre-determined digital communication protocol employed in the digital communication network. Those operational modules that include a detector further comprise an analog-to-digital converter (118) for converting a detected signal into a digital form and a digital circuitry (119) for providing digital information based on the detected signal with address data related to a particular operational module to which the digital information is to be delivered via the digital communication network.
    Type: Grant
    Filed: January 18, 2010
    Date of Patent: June 3, 2014
    Assignee: Wallac Oy
    Inventors: Jyrki Laitinen, Antero Yli-Koski, Markku Ojala
  • Patent number: 8731408
    Abstract: An approach for saving power in a fiber ports of a network system is provided. An instance of a period of inactivity for a fiber port of the network system is determined. Power delivery to a transmit laser of an SFP (small form-factor pluggable) device of the fiber port is terminated during at least a portion of the period of inactivity. Power delivery to the SFP device is maintained while power delivery to the transmit laser is terminated.
    Type: Grant
    Filed: May 23, 2011
    Date of Patent: May 20, 2014
    Assignee: Alcatel Lucent
    Inventor: Eric W. Tolliver
  • Patent number: 8665762
    Abstract: The invention provides a method, apparatus and computer program product for ensuring that a device (26) operable in a network (1) is configured to operate according to documented functional requirements for the network. Positional information comprising the coordinates of each device (26, 9, 50) in the network (1) is received via a gateway (9, 50) at a data processing apparatus (10) storing the documented functional requirements. The coordinates of each device (26, 9) in the network (1) are used to deduce the required functionality of the device based on the stored functional requirements, instructions for implementing the functionality are generated and the instructions are sent via the gateway (9, 50) to the network. The invention has particular relevance in the commissioning stage of a lighting control network.
    Type: Grant
    Filed: June 15, 2006
    Date of Patent: March 4, 2014
    Assignee: Koninklijke Philips N.V.
    Inventors: Engel J. Knibbe, Theodoor H. Stommen
  • Patent number: 8554086
    Abstract: Disclosed is a method for setting a power control initial value by using an indication light in visible light communications and a transmission/reception (Tx/Rx) apparatus using the method. The method includes the steps of: radiating multiple indication lights having power levels different from one another by a visible light communication transmitter; aligning a communication position simultaneously with measuring Received Signal Strength Indication (RSSI) of the indication light on detecting the indication light, selecting a power level whose RSSI is in a preset threshold range and which is adequate for transmission/receive among the multiple power levels different from one another, and informing the visible light communication transmitter of the adequate power level by a visible light communication receiver; and transmitting data from the visible light communication transmitter to the visible light communication receiver by using a transmitted power initial value according to a selected power level.
    Type: Grant
    Filed: January 7, 2008
    Date of Patent: October 8, 2013
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Jong-Hoon Ann
  • Patent number: 8532495
    Abstract: A method performed by a networked device for energy efficient operation of an optical transceiver of the networked device is described herein. It is determined whether a port control of the networked device is enabled to operate in an energy efficient state. Where the port control is enabled to operate in the energy efficient state and an absence of a valid receive energy from a link partner is determined, a laser transmitter of the optical transceiver is pulsed by asserting and de-asserting a control signal.
    Type: Grant
    Filed: July 23, 2010
    Date of Patent: September 10, 2013
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Keng Hua Chuang, Daniel Joseph Dove, Mark Gravel, Yee Hong Tan, Lawrence Lee Chee How
  • Patent number: 8422887
    Abstract: A system for redundancy in Ethernet passive optical networks (EPONs) facilitates fast recovery from failure (less than 50 msec), path redundancy of the fiber optic network, and location redundancy of the OLTs. An optical networking unit (ONU) in a normal state monitors input communications, and when the input communications are quiet for a predetermined minimum length of time, the ONU transitions to a lenient state in which: the ONU accepts old and new security keys; upon receiving a packet: the ONU updates an ONU timestamp based on the packet's timestamp; and the ONU transitions to the normal state of operation. While the ONU is in the lenient state if a packet is not received for a predetermined given length of time the ONU transitions to a deregistered state. In this system, main and standby OLTs do not require synchronization of security parameters or synchronization for differences in fiber lengths.
    Type: Grant
    Filed: January 31, 2010
    Date of Patent: April 16, 2013
    Assignee: PMC Sierra Ltd
    Inventors: Zachy Haramaty, Yaniv Kopelman, Alon Meirson, Lior Khermosh
  • Patent number: 8391721
    Abstract: A method for remote communication using the interpretation of thermoluminescence or photoluminescence signals uses a property of photoluminescence or of thermoluminescence when it is caused by entangled trapped electrons. In this case, stimulation of deexcitation of trapped electrons by heat or radiation occurs when the deexcitation thermal energy is approximately equal to the trap-emptying energy. Stimulation by a temperature rise of a “master” sample induces luminescence of a remote “slave” “entangled” sample, which is reproduced on lowering the temperature of the “master” sample whatever the distance and the media separating the “master” sample and the “slave” sample. This teaching and its generalization to other forms of stimulation is used by the method of interpreting the quantum reception measurements so as to determine, using a correlation method, the transmission of information or commands.
    Type: Grant
    Filed: March 26, 2007
    Date of Patent: March 5, 2013
    Assignee: Saquant
    Inventor: Robert Desbrandes
  • Patent number: 8260152
    Abstract: A signal detection method used in an optical receiver apparatus detects the variation of an optical input level from the presence or absence of a clock signal and appropriately controls a dispersion compensator, thereby enabling the presence or absence of an input signal to be correctly determined. The signal detection method includes: detecting the level of input light of an optical amplifier, storing the level of the detected input light, comparing the level of the stored previous input light with the level of current input light, detecting the level variation of the input light by the comparison to detect the state change of the presence or absence of an optical signal, performing a dispersion compensation on the input light, and extracting a clock from an optical input. When the level variation of the input light is detected, the presence or absence of the optical signal of the input light is determined from the presence or absence of the clock signal.
    Type: Grant
    Filed: September 1, 2009
    Date of Patent: September 4, 2012
    Assignee: Fujitsu Limited
    Inventors: Togo Fukushi, Tsukasa Takahashi
  • Patent number: 8238556
    Abstract: A quantum communication system comprising a sending unit and a receiving unit, said sending unit comprising a photon source assembly configured to output a stream of pulses of light having at least two different intensities and a memory configured to store information for determining which pulses should be reference pulses and which pulses should be data pulses, the average intensity of reference pulses being different to the average intensity of data pulses, the receiving unit comprising a memory for storing information for identifying the position of reference pulses within the stream of pulses and a processor for determining the calibration of the quantum communication system from the reference pulses.
    Type: Grant
    Filed: September 8, 2006
    Date of Patent: August 7, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Zhiliang Yuan, Andrew James Shields
  • Patent number: 8145057
    Abstract: A method for localizing an optical network termination (ONT) of a passive optical network is disclosed. The passive optical network comprises an optical line terminal (OLT) and an optical distribution network (ODN) having a plurality of optical links. The ONT is connectable to the OLT by a given optical link of the optical distribution network. The method includes the steps of detecting that the ONT has been connected to the OLT by an optical link of the optical distribution network; determining length information indicative of a length of the optical link; comparing the length information with a reference length information indicative of a length of the given optical link; and if the length information matches the reference length information, localizing the ONT by confirming that it is connected to the OLT by the given optical link.
    Type: Grant
    Filed: December 29, 2008
    Date of Patent: March 27, 2012
    Assignee: Telecom Italia S.p.A.
    Inventors: Luciana Costa, Roberta D'Amico, Paolo De Lutiis, Luca Viale
  • Patent number: 8139940
    Abstract: There is provided a wavelength division multiplexing transmission system and apparatuses used therein, in which a remote apparatus to be newly added to a station apparatus autonomously sets a wavelength to be used in the remote apparatus, thereby avoiding the need for presetting a wavelength to be used in the remote apparatus. The remote apparatus includes wavelength determining means that determines an available wavelength on the basis of an optical signal received from the station apparatus. The wavelength determining means may determine the wavelength of an unreceived optical signal as the available wavelength or may determine the wavelength of a received optical signal as the available wavelength, and may set that wavelength as a transmission and reception wavelength to be used in the remote apparatus.
    Type: Grant
    Filed: December 4, 2009
    Date of Patent: March 20, 2012
    Assignee: NEC Corporation
    Inventor: Shigekazu Harada
  • Patent number: 8126334
    Abstract: A transceiver assembly is provided for use in an optical telecommunications network. The circuitry arrangement in the transceiver of the present invention generates a ranging signal that is transmitted along the fibers attached thereto and then filters the return signal in an manner that eliminates virtually all of the noise effects found on the fiber to provide a highly reliable timing signal for an accurate delay calculation. A band pass filter is supplied in line before the input signal is allowed to pass to the ranging signal detector and comparator thereby allowing only a signal at the fundamental frequency of the input signal to pass, thereby eliminating false signal detect triggers.
    Type: Grant
    Filed: October 20, 2008
    Date of Patent: February 28, 2012
    Assignee: Oplink Communications, Inc. a Delaware corporation
    Inventor: Reza Miremadi
  • Patent number: 8112000
    Abstract: An electronic device includes a casing having a laser light reception region on its outer surface, a receiver that receives transmission data from a partner device, and a suppression member that suppresses leakage of the laser light between the partner device and the electronic device. The partner device includes a laser light emission component and a laser light modulator. The receiver detects, in a state where the partner device and the electronic device are positioned in to communicable positions where the laser light from the partner device is made incident inside the light reception region of the electronic device, the laser light incident inside the light reception region and demodulates the transmission data from the laser light detection result. The suppression member is disposed in at least an area surrounding the light reception region.
    Type: Grant
    Filed: January 28, 2009
    Date of Patent: February 7, 2012
    Assignee: FUJIFILM Corporation
    Inventors: Naoyuki Nishino, Yasunori Ohta, Eiichi Kito, Kenta Matsubara
  • Patent number: 8050566
    Abstract: A system and a method for quantum key distribution between a transmitter and a receiver over wavelength division multiplexing (WDM) link are disclosed. The method includes providing one or more quantum channels and one or more conventional channels over the WDM link; assigning a different wavelength to each of the one or more quantum channels and each of the one or more conventional channels; transmitting single photon signals on each of the one or more quantum channels; and transmitting data on each of the one or more conventional channels. The data comprises either conventional data or trigger signals for synchronizing the transmission of the single photon signals on the quantum channels. All channels have wavelengths around 1550 nm. The WDM link can be a 3-channel WDM link comprising two quantum channels for transmitting single photon signals and one conventional channel for transmitting conventional data or triggering signals.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: November 1, 2011
    Assignee: The Chinese University of Hong Kong
    Inventors: Yuhui Luo, Kam Tai Chan
  • Patent number: 7952491
    Abstract: Various approaches for a traffic control preemption system that includes a receiver, a light emitter, and control circuitry. The receiver includes a photodetector and circuitry that produces a number of electrical pulses in response to each detected light pulse. For each detected light pulse the number of electrical pulses represents a level of radiant power of the light pulse, and a threshold number of electrical pulses and an activation frequency at which the threshold number of electrical pulses is repeated activates preemption. The control circuitry is coupled to the light emitter and controls the light emitter to emit bursts of light pulses. Each burst includes at least two light pulses and a frequency of light pulses in each burst and a frequency of the bursts cause the receiver to produce at least the threshold number of electrical pulses at the activation frequency and activate the preemption.
    Type: Grant
    Filed: June 19, 2008
    Date of Patent: May 31, 2011
    Assignee: Global Traffic Technologies, LLC
    Inventors: Mark Schwartz, Charles Meyer
  • Patent number: 7937817
    Abstract: An instrumented fastener (e.g., a “tack” fastener) includes one or more light sources (e.g., light-emitting diodes) configured to produce a light beacon that includes encoded information regarding the instrumented fastener (e.g., part number), wherein the direction of the light beacon can be used to align external and/or internal assembly systems to the instrumented fasteners. The light beacon may be activated automatically, or via an instruction received from an external system. Once aligned, the assembly system may, for example, proceed with installing permanent fasteners between neighboring tack fasteners.
    Type: Grant
    Filed: May 31, 2007
    Date of Patent: May 10, 2011
    Assignee: The Boeing Company
    Inventors: Branko Sarh, Harry Asada
  • Patent number: 7912376
    Abstract: Embodiments include apparatus, methods, and system including an apparatus comprising a photo receiver operable to detect a stream of light pulses transmitted from a photo transmitter paired with the photo receiver, wherein a frequency of the stream of light pulses has a harmonic relationship with a frequency of at least one other stream of light pulses transmitted by a photo transmitter not paired to the photo receiver, wherein the stream of light pulses from the transmitter paired with the photo receiver is detectable by the photo receiver even when the photo receiver is receiving one or more light pulses from the at least one other stream of light pulses.
    Type: Grant
    Filed: September 28, 2007
    Date of Patent: March 22, 2011
    Assignee: Rockwell Automation Technologies, Inc.
    Inventor: George E. Rollins
  • Patent number: 7869708
    Abstract: A method and apparatus is provided for obtaining status information from a given location along an optical transmission path. The method begins by generating a cw probe signal having a prescribed frequency that is swept over a prescribed frequency range. The cw probe signal is transmitted over the optical path and a returned COTDR signal in which status information concerning the optical path is embodied is received over the optical path. A receiving frequency within the prescribed frequency range of the returned COTDR signal is detected to obtain the status information. The detecting step includes the step of sweeping the receiving frequency at a rate equal to that of the prescribed frequency. A period associated with the receiving frequency is temporally offset from a period associated with the prescribed frequency.
    Type: Grant
    Filed: March 5, 2004
    Date of Patent: January 11, 2011
    Assignee: Huawei Marine Networks Co., Ltd.
    Inventors: Stephen G. Evangelides, Jr., Jonathan A. Nagel
  • Patent number: 7869718
    Abstract: A wireless, automatic door obstruction detection system for protecting a motorized door or gate by signaling various hazardous conditions and reacting to said conditions by signaling control means. The invention utilizes wireless infrared emitter, receiver and controller apparatus. Infrared pulse timing data is sent as pulse repetition rate changes depending upon battery condition. In a preferred embodiment of the invention, the photoelectric transmitter emits timed pulse groups to present control information differentiating between a good battery and a low battery condition in the wireless transmitter. A wireless photoelectric transmitter extends the time period between pulse groups to indicate a low battery condition. A low battery condition signaling thereby presents a low power drain condition allowing for an extended period of low battery condition signaling.
    Type: Grant
    Filed: November 29, 2007
    Date of Patent: January 11, 2011
    Assignee: Miller Edge, Inc.
    Inventors: Vinay Sao, Krishnaraj N. Tejeswi, Gary Leigh, Bearge Miller
  • Patent number: 7860399
    Abstract: 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 transceiver module transmitting a first validation optical signal to a second optical transceiver module via an optical waveguide, such as an optical fiber, that physically interconnects both transceivers. The first validation optical signal is received by the second optical transceiver module, which lights an indicator light on its housing and returns a second validation optical signal to the first optical transceiver module. Upon receipt of the signal, the first transceiver lights its indicator light and enables data transfer to occur between both transceivers.
    Type: Grant
    Filed: December 4, 2006
    Date of Patent: December 28, 2010
    Assignee: Finisar Corporation
    Inventor: John Hsieh
  • Patent number: 7831150
    Abstract: A combat IFF system, for use in a combat exercise or on the battlefield, including a helmet-mounted passive IFF response unit and a weapon-mounted IFF interrogatory unit for each soldier. Infrared (IR) signals are employed for both challenge and response. The IR response signal is a very narrowly-targeted reflection of the relatively narrow IR transmit signal, thereby minimizing interception opportunities. The transmit and response signals are encoded in a transaction that cannot be compromised even when either or both signals are intercepted and decoded by the enemy. The combat IFF system includes biometric anti-spoofing features that prevent any use by an enemy in possession of captured units. Military radio-frequency (RF) spectrum is not required so there are no bandwidth limitations on simultaneous IFF transactions in the battlefield. A combat IFF transaction is completed in milliseconds.
    Type: Grant
    Filed: December 10, 2007
    Date of Patent: November 9, 2010
    Assignee: Cubic Defense Systems, Inc.
    Inventors: John B. Roes, Deepak Varshneya
  • Patent number: 7826749
    Abstract: A system and a method for quantum key distribution over a multi-user wavelength division multiplexing (WDM) network are disclosed. The system comprises a tunable or multi-wavelength transmitter; a plurality of receivers, each assigned a receiving-wavelength; and a multi-user WDM network linking the transmitter to the receivers. The transmitter can select a receiver among the receivers to be communicated therewith and transmit quantum signals to the selected receiver over the WDM network. The quantum signals are at a wavelength equal to a receiving-wavelength of the receiver. Therefore the WDM network allows quantum signals to be communicated between the transmitter and the receivers by wavelength routing.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: November 2, 2010
    Assignee: The Chinese University of Hong Kong
    Inventors: Yuhui Luo, Kam Tai Chan
  • Patent number: 7822055
    Abstract: The Fibre Channel Credit Extender (FCCE) (600) is a network device that is disposed between and connected to an end node (210) and an optical repeater (220). The FCCE (600) contains as many buffer credits as necessary, to solve bandwidth problems in a network. In a situation where maximum bandwidth is required in both directions of a link, the FCCE (600) breaks a single logical link into three physically separated “linklets.” The short-distance linklets attain maximum bandwidth by use of the existing buffer credits of the end nodes. The long-distance linklet attains maximum bandwidth by use of very high receive buffer credits in the FCCEs (600). In this way, only those links that need maximum bandwidth over distances not covered by end-node credit counts need be attached to an FCCE (600). The FCCE (600) contains the optical repeater to gain distance on that link, and contains high credit count receive buffers to gain bandwidth on the link.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: October 26, 2010
    Assignee: QLogic Switch Products, Inc.
    Inventors: William R. George, Steven M. Betker
  • Patent number: 7809268
    Abstract: A method for integrating an Optical Service Channel (OSC) with a Quantum Key Distribution (QKD) channel across a DWDM network having a single mode optical fiber is provided. An optical signal is received. An OSC is coupled with the optical signal. A QKD channel is integrated with the OSC on the single mode optical fiber.
    Type: Grant
    Filed: March 13, 2006
    Date of Patent: October 5, 2010
    Assignee: Cisco Technology, Inc.
    Inventors: Fausto Meli, Gabriele Maria Galimberti
  • Patent number: 7808401
    Abstract: Various approaches for activating a traffic control preemption system. The traffic control preemption system has a receiver with a photodetector and circuitry that produces a number of electrical pulses in response to each detected light pulse. For each detected light pulse the number of electrical pulses represents a level of radiant power of the light pulse. A threshold number of electrical pulses and an activation frequency at which the threshold number of electrical pulses is repeated activates preemption. Control circuitry is coupled to a light emitter and controls the light emitter to emit bursts of light pulses. Each burst includes at least two light pulses and the control circuitry controls the frequency of light pulses in each burst and the frequency of the bursts to cause the receiver to produce at least the threshold number of electrical pulses at the activation frequency and activate the preemption.
    Type: Grant
    Filed: June 16, 2008
    Date of Patent: October 5, 2010
    Assignee: Global Traffic Technologies, LLC
    Inventors: Mark Schwartz, Charles Meyer
  • Patent number: 7787776
    Abstract: 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 received data packets and IR data. A processor provides the control data packets to be transmitted by the IR transmitter. The processor determines that an external communication device is initiating communication with a target device over the network based on at least the received data packet received by the IR receiver. The processor establishes bi-directional communication over the network between the external communication device and the target device which is one of the processor, the system control panel and the at least one device.
    Type: Grant
    Filed: August 3, 2006
    Date of Patent: August 31, 2010
    Assignee: Tyco Safety Products Canada Ltd.
    Inventor: Raman Kumar Sharma
  • Patent number: 7725037
    Abstract: 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 medium thereby switching the state of the optical signal component on the basis of its incremented phase. Multiple escort beams may also be employed to switch different wavelength components of the signal. The method may be employed to achieve high speed, and substantially transparent, switching of phase, intensity or polarization of a signal.
    Type: Grant
    Filed: November 13, 2006
    Date of Patent: May 25, 2010
    Assignee: The Board of Trustees of the University of Illinois
    Inventors: Aaron Pace VanDevender, Paul G. Kwiat
  • Patent number: 7720388
    Abstract: The present invention is directed toward systems for conducting laser range and enabling optical communication between a plurality of entities and to the application of such systems in a secure covert combat identification system. In one embodiment, the present invention uses a novel laser system that generates high pulse rates, as required for optical communications, while concurrently generating sufficiently high power levels, as required by laser range finding operations. One application of the present invention is in enabling secure covert communications between a plurality of parties. Another application of the present invention is in tracking and identifying the movement of objects.
    Type: Grant
    Filed: December 10, 2008
    Date of Patent: May 18, 2010
    Assignee: Cubic Corporation
    Inventors: Deepak Varshneya, John Roes
  • Patent number: 7684703
    Abstract: There is provided a wavelength division multiplexing transmission system and apparatuses used therein, in which a remote apparatus to be newly added to a station apparatus autonomously sets a wavelength to be used in the remote apparatus, thereby avoiding the need for presetting a wavelength to be used in the remote apparatus. The remote apparatus includes wavelength determining means that determines an available wavelength on the basis of an optical signal received from the station apparatus. The wavelength determining means may determine the wavelength of an unreceived optical signal as the available wavelength or may determine the wavelength of a received optical signal as the available wavelength, and may set that wavelength as a transmission and reception wavelength to be used in the remote apparatus.
    Type: Grant
    Filed: March 10, 2004
    Date of Patent: March 23, 2010
    Assignee: NEC Corporation
    Inventor: Shigekazu Harada
  • Patent number: 7639947
    Abstract: A system and a method for quantum key distribution between a transmitter and a receiver over wavelength division multiplexing (WDM) link are disclosed. The method includes providing one or more quantum channels and one or more conventional channels over the WDM link; assigning a different wavelength to each of the one or more quantum channels and each of the one or more conventional channels; transmitting single photon signals on each of the one or more quantum channels; and transmitting data on each of the one or more conventional channels. The data comprises either conventional data or trigger signals for synchronizing the transmission of the single photon signals on the quantum channels. All channels have wavelengths around 1550 nm. The WDM link can be a 3-channel WDM link comprising two quantum channels for transmitting single photon signals and one conventional channel for transmitting conventional data or triggering signals.
    Type: Grant
    Filed: September 19, 2005
    Date of Patent: December 29, 2009
    Assignee: The Chinese University of Hong Kong
    Inventors: Yuhui Luo, Kam Tai Chan
  • Patent number: 7581890
    Abstract: A method, apparatus, and system for implementing optical interconnects between high speed electrical interconnects by determining if an optical link exists between two optical transceivers, and if so, connecting input termination on the transmit input portion of each optical transceiver.
    Type: Grant
    Filed: October 9, 2007
    Date of Patent: September 1, 2009
    Assignee: Intel Corporation
    Inventor: Darren S. Crew
  • Patent number: 7574132
    Abstract: A method for starting lasers in a network is provided. According to the method, a restart phase in automatic mode is initiated after the laser is disconnected. During the restart phase in automatic mode, which is accompanied by a delay time for the new laser connection, the automatic mode is switched to a different mode in which the new connection of the laser takes place faster than in automatic mode. This can be achieved by switching to manual mode as per ITU-T G.664. Furthermore, safety measures are defined before activating switching from the network management or a network element control so that safety is ensured during the fast, new connection of the laser.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: August 11, 2009
    Assignee: Nokia Siemens Networks GmbH & Co. KG
    Inventor: Bernd Stilling
  • Patent number: 7561039
    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.
    Type: Grant
    Filed: November 14, 2005
    Date of Patent: July 14, 2009
    Assignee: SAAB AB
    Inventors: Lennart Nordevall, Stefan Andersson
  • Patent number: 7504622
    Abstract: A high-throughput inspection system and method.
    Type: Grant
    Filed: March 12, 2007
    Date of Patent: March 17, 2009
    Assignee: Applied Materials, Israel, Ltd.
    Inventors: Emanuel Elyasaf, Nissim Elmaliah
  • Publication number: 20080295314
    Abstract: An instrumented fastener (e.g., a “tack” fastener) includes one or more light sources (e.g., light-emitting diodes) configured to produce a light beacon that includes encoded information regarding the instrumented fastener (e.g., part number), wherein the direction of the light beacon can be used to align external and/or internal assembly systems to the instrumented fasteners. The light beacon may be activated automatically, or via an instruction received from an external system. Once aligned, the assembly system may, for example, proceed with installing permanent fasteners between neighboring tack fasteners.
    Type: Application
    Filed: May 31, 2007
    Publication date: December 4, 2008
    Inventors: Branko Sarh, Harry Asada
  • Patent number: 7457547
    Abstract: In an optical system including an optical input port for projecting an input optical signal onto an optical phased matrix array, an optical phased matrix array including a plurality of individually addressable pixels thereon, each said pixel being drivable within a prescribed range of levels, and an optical output port for collecting a predetermined fraction of said optical signal received from said optical phased matrix array; a method of compensating for phase distortions including the steps of: (a) determining a plurality of transfer functions relating said level of each said pixel to the phase variation each said pixel introduces to light from said input optical signal which is incident thereon; and (b) controlling the level of selected ones of said pixels in accordance with a corresponding transfer function such that said fractional signal received at said output port is modified in phase to substantially compensate for optical phase distortions arising from said optical phased matrix array.
    Type: Grant
    Filed: November 8, 2004
    Date of Patent: November 25, 2008
    Assignee: Optium Australia Pty Limited
    Inventors: Steven J. Frisken, Glenn W. Baxter, Hao Zhou, Dmitri Abakoumov
  • Patent number: 7437081
    Abstract: 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 timing sequence, a first optical modulator/demodulator capable of transmitting and receiving timing signals in accordance with the predefined timing sequence, a first quantum transceiver capable of transmitting and receiving quantum signals in accordance with the predefined timing sequence, and a first controller connected to the first public data transceiver, the first optical modulator/demodulator, and the first quantum transceiver. The first controller is capable of controlling the transmission of the public data, the timing signals, and the quantum signals in accordance with the predefined timing sequence.
    Type: Grant
    Filed: November 1, 2004
    Date of Patent: October 14, 2008
    Assignee: Magiq Technologies, Inc
    Inventors: J. Howell Mitchell, Harry N. Vig, Anton Zavriyev, Alexei Trifonov
  • Publication number: 20080175596
    Abstract: Optical correlators are discussed, suitable for in-vehicle distance measurement. The correlators use modulation sequences based on maximal length sequences. A number of different modulation sequences are obtained by generator (32) from a single maximal length sequence, either by adding a variable number of cycles to the end of the maximal length sequence or by starting the maximal length sequence at different points in the sequence.
    Type: Application
    Filed: October 20, 2005
    Publication date: July 24, 2008
    Inventor: Christopher John Morcom
  • Publication number: 20080138080
    Abstract: In an Optical Network Termination (ONT), a software controlled system, method and computer readable medium includes measuring a modulation current of an upstream laser transmission. The measured modulation current is processed to determine if a continuous transmission state is present, in response to which, a processor of the ONT sends a signal to shut down the upstream laser transmission. The software solution allows reconfigurable parameters including sample rate and shut down procedure.
    Type: Application
    Filed: August 15, 2007
    Publication date: June 12, 2008
    Applicant: ALCATEL LUCENT
    Inventors: RAYMOND E. TYRRELL, COLLINS WILLIAMS, JONATHAN HUFFMAN, TRAVIS LENTZ, DOUGLAS LAYNE
  • Patent number: 7381939
    Abstract: 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 cargo detection. The receiver includes a DC block for removing effects of ambient light. The detector performs detection multiple times and averages the results, which can be compared with a previously stored condition of cargo presence or absence to increase the detection accuracy further.
    Type: Grant
    Filed: June 2, 2005
    Date of Patent: June 3, 2008
    Assignee: Transcore Link Logistics Corporation
    Inventors: Robert Fry, Wayne McPherson, David Roscoe
  • Patent number: 7359634
    Abstract: 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-color optical signal where the relative (or absolute) magnitudes of the color components identify the connection. On the receiver end, an RGB photodiode measures the relative (or absolute) magnitudes of the color components to verify the connection. Alternatively, one end of the connection may transmit white light with the other end reflecting back a similar three-color signal by use of a color-coded panel reflector.
    Type: Grant
    Filed: August 1, 2003
    Date of Patent: April 15, 2008
    Assignee: Cisco Technology, Inc.
    Inventor: Fausto Meli