Retroreflection Patents (Class 398/169)
  • Patent number: 9800342
    Abstract: The invention relates to an optical WDM transmission network including at least one optical line terminal, a remote node and a plurality of optical network units. The at least one optical line terminal is connected to the optical remote node via an optical WDM path. Each optical network unit is connected to the optical remote node via an optical distribution path.
    Type: Grant
    Filed: April 6, 2016
    Date of Patent: October 24, 2017
    Assignee: Adva Optical Networking SE
    Inventors: Michael Eiselt, Klaus Grobe
  • Patent number: 9014553
    Abstract: A satellite test signal reflection apparatus for testing transmitters sending out optical signals, the apparatus includes a plate that is at least partially permeable to optical signals. The plate has a base with a first surface with a residual reflective coating and a second surface. The residual reflective coating is configured to split an optical beam, which penetrates the plate in a first direction from the first surface to the second surface, into a reflective optical beam and a transmitted optical beam.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: April 21, 2015
    Assignee: Tesat-Spacecom GmbH & Co. KG
    Inventor: Andreas Weichert
  • Patent number: 8971721
    Abstract: A method for bidirectional optical communication comprising the steps of:—at a first optical line terminal, directly modulating a laser source to generate a downstream optical signal which has an optical power spectrum comprising two peaks having a frequency separation and a non zero power difference at generation;—propagating said downstream optical signal at a distance along an optical line comprising at least a first optical fiber propagating said downstream optical signal to a second optical line terminal;—at the second optical line terminal: power splitting said downstream optical signal to generate a first and a second power portion of said downstream optical signal, spatially separated; passive filtering said first power portion of said downstream optical signal so as to increase in absolute value a respective power difference of said two peaks, so as to obtain a filtered optical signal which is thereafter detected; and amplitude modulating the second power portion of the downstream optical signal so a
    Type: Grant
    Filed: May 20, 2009
    Date of Patent: March 3, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Rinaldo Mazzone, Francesco Martini, Mauro Rudi Casanova
  • Patent number: 8867921
    Abstract: Techniques, apparatus and systems to provide carrier signal transmission in reciprocal transmission architecture networks for optical communications.
    Type: Grant
    Filed: September 29, 2009
    Date of Patent: October 21, 2014
    Assignee: Ziva Corporation
    Inventors: David F. Smith, Anis Husan
  • Patent number: 8818202
    Abstract: A wavelength sensing lighting system may include a light source, a sensor and a controller. One or more light sources and sensors may be included in an array. The light source may emit an illuminating light and the sensor may sense an environmental light. The illuminating light may include data light. The lighting system may include a plurality of nodes connected in a network. The nodes may communicate by emitting and receiving the data light, which may be analyzed by the controller. The light source and the sensor may be provided by a light emitting semiconductor device that is capable of emitting illuminating light and receiving environmental light. A conversion material may convert the wavelength of a source light into a converted light. The conversion material may increase the wavelength range of light emittable and detectable by the lighting system.
    Type: Grant
    Filed: May 23, 2013
    Date of Patent: August 26, 2014
    Assignee: Environmental Light Technologies Corp.
    Inventors: Fredric S. Maxik, David E. Bartine, Pedro Medelius, Eric Bretschneider
  • Patent number: 8805202
    Abstract: According to one embodiment, there is provided a visible-light communications system in which bidirectional visible-light communication is performed between a visible-light communications device and a mobile terminal. The device has one light source. The mobile terminal has a retroflection unit. The mobile terminal further has first and second optical filters. The first optical filter extracts a visible light beam modulated with the data transmitted from the visible-light communications device. The second optical filter extracts a visible light beam that will be used as a retroflection light beam that is not modulated.
    Type: Grant
    Filed: June 25, 2009
    Date of Patent: August 12, 2014
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Katsuyoshi Suzuki, Shigehito Shimada
  • Patent number: 8670673
    Abstract: The invention relates to a method of operating an optical transmission system (100a, 100b, 100c), wherein at least one optical data signal is transmitted over an optical transmission link (120), which particularly comprises at least one optical fiber (120a). The inventive method is characterized by modulating (200) said data signal with a test signal (s) having a predetermined modulation frequency fmod to obtain a modulated data signal (Pin), by receiving (210) a reflected portion (Pback) of said modulated data signal (Pin), and by determining (220) a fiber quality measure (a) depending on said received reflected portion (Pback) of said modulated signal (Pin).
    Type: Grant
    Filed: November 10, 2010
    Date of Patent: March 11, 2014
    Assignee: ADVA AG Optical Networking
    Inventor: Michael Eiselt
  • Patent number: 8655189
    Abstract: An optical modulation system includes a metamaterial structure configured to receive and process an input optical signal at at least one operational wavelength, where the metamaterial structure changes between a transmissive state and a non-transmissive state with respect to the optical signal(s) at the operational wavelength(s) in response to an external stimulus applied to the metamaterial structure. An external stimulus source is coupled with the metamaterial structure and is configured to change the metamaterial structure between its transmissive and non-transmissive states by applying selected stimulus pulses to the metamaterial structure. The optical modulation system processes the input optical signal to output a modulated optical signal that modulates in correspondence with the selected pulses applied to the metamaterial structure.
    Type: Grant
    Filed: June 18, 2010
    Date of Patent: February 18, 2014
    Assignee: Exelis, Inc.
    Inventors: Robert Joseph Almassy, Anthony Bresenhan Kaye, Thomas Matthew Fletcher
  • Patent number: 8515289
    Abstract: A wavelength sensing lighting system may include a light source, a sensor and a controller. One or more light sources and sensors may be included in an array. The light source may emit an illuminating light and the sensor may sense an environmental light. The illuminating light may include data light. The lighting system may include a plurality of nodes connected in a network. The nodes may communicate by emitting and receiving the data light, which may be analyzed by the controller. The light source and the sensor may be provided by a light emitting semiconductor device that is capable of emitting illuminating light and receiving environmental light. A conversion material may convert the wavelength of a source light into a converted light. The conversion material may increase the wavelength range of light emittable and detectable by the lighting system.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: August 20, 2013
    Assignee: Environmental Light Technologies Corp.
    Inventors: Fredric S. Maxik, David E. Bartine, Pedro Medelius
  • Patent number: 8447188
    Abstract: A retro-reflective identification tag capable of modulating an optical signal whereby to support bi-directional communication with an associated remote optical interrogation device. The tag comprises a MOEMS modulating layer over a retro-reflective substrate, giving the tag a wide angle of effective operation. The tag modulator may optionally be switched on only responsive to detection of a precursor beam from the interrogation system in order to save power. The interrogation device may make use of multiple optical wavelengths for communicating with the tag.
    Type: Grant
    Filed: May 6, 2004
    Date of Patent: May 21, 2013
    Assignee: Qinetiq Limited
    Inventors: Andrew M Scott, Keith L Lewis, Mark E McNie, Kevin M Brunson, David J Jackson, Kevin D Ridley
  • Patent number: 8417125
    Abstract: Methods, systems and other embodiments associated with a laser communication system using a single wavelength are presented. A first data is modulated onto an RF carrier to produce a modulated RF carrier. A laser is intensity modulated using with the modulated RF carrier. The intensity modulated laser beam is transmitted from an interrogator to a modulating retro-reflector (MRR) terminal. A portion of the laser beam is received at a receiver at the MRR terminal. Another portion of the laser is modulated at the MRR terminal with a second data to produce a re-modulated laser beam. The re-modulated laser beam is reflected back to the interrogator.
    Type: Grant
    Filed: May 28, 2010
    Date of Patent: April 9, 2013
    Assignee: BAE Systems Information and Electronic Systems Integration Inc.
    Inventors: Naresh Chand, Bruce Eteson, Daniel Taskalos
  • Patent number: 8396373
    Abstract: A retroreflector coupled with a polarization rotator is provided according to some embodiments. The polarization rotator can be designed and/or configured to introduce a fraction of a wavelength phase difference in a received beam of light prior to reflecting the beam of light back toward the source of the light. By switching the state of the polarization rotator a communication signal can be modulated on the return beam of light.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: March 12, 2013
    Assignee: Cubic Corporation
    Inventors: Michael A. Roes, Jonathan R. O'Brien
  • Patent number: 8301032
    Abstract: An optical system for remotely optical communications at a high data rate between a base station and a remote station under atmospheric turbulence conditions is disclosed. The remote station includes an entirely different type of retroreflector that does not use the conventional type of retroreflection, but instead consists of two sets of lenslets coupled with single-mode fiber array, called fiber “retro”. Amplified retromodulation is achieved requiring only one single optical amplifier and one single modulator. A transmitter located at the base station sends an interrogating optical beam to the fiber “retro” which modulates the optical beam according to the input signal/data, and redirects the modulated optical beam to the base station for detection by a receiver. The present invention includes the capabilities of providing Identification of Friend-or-Foe (IFF), secure communication, and a means of achieving a wide field-of-view (FOV) with a fiber-coupled lenselet array.
    Type: Grant
    Filed: February 12, 2008
    Date of Patent: October 30, 2012
    Inventors: Arun Kumar Majumdar, Thomas Maurice Shay
  • Patent number: 8301040
    Abstract: An optical transmission system using Raman optical amplification, which is configured in a WDM-PON topology where a signal light between an optical line terminal and each of optical network units is multi/demultiplexed at a WDM. The optical line terminal supplies continuous lights having wavelengths to the optical network units through an optical fiber from the optical line terminal. The continuous lights are used for an uplink signal. In addition, the optical line terminal outputs a pumping light having a wavelength which is used to excite lights of the continuous lights, to the optical fiber from the optical line terminal.
    Type: Grant
    Filed: June 11, 2009
    Date of Patent: October 30, 2012
    Assignees: Fujikura Ltd., Shibaura Institute of Technology
    Inventor: Norio Kashima
  • Patent number: 8249279
    Abstract: An apparatus includes an electromagnetic signal device, a medium, and a sound wave generator. The sound wave generator includes a carbon nanotube structure. The electromagnetic signal device transmits an electromagnetic signal to the carbon nanotube structure. The carbon nanotube structure converts the electromagnetic signal into heat. The heat transfers to the medium and causes a thermoacoustic effect.
    Type: Grant
    Filed: June 4, 2009
    Date of Patent: August 21, 2012
    Assignees: Beijing FUNATE Innovation Technology Co., Ltd., Hon Hai Precision Industry Co., Ltd.
    Inventors: Kai-Li Jiang, Lin Xiao, Zhuo Chen, Shou-Shan Fan, Chen Feng, Yuan-Chao Yang
  • Patent number: 8204384
    Abstract: A system, method, and communication device are disclosed. The system can include an optical interrogator and a phase-modulating communication device. The communication device can include a retro-optimized lens, a phase modulator, and a processor. The retro-optimized lens can be a non-imaging optical arrangement configured to minimize deviation between an incoming signal and a reflected signal used for return link communications. The processor can be configured to calibrate a modulation path length of the communication device based on a wavelength of the communication signal and can control an operation of the phase-modulator to send phase-coded messages to the interrogator. Optionally, the processor can perform a real-time phase calibration of the communication device using feedback from the interrogator.
    Type: Grant
    Filed: November 20, 2009
    Date of Patent: June 19, 2012
    Assignee: Cubic Corporation
    Inventors: Paul Amadeo, Allen Ripingill, David Robinson, Irene Chen
  • Patent number: 8184980
    Abstract: A system for monitoring ancillary elements of an electric power distribution network, includes an optical fiber path associated with the ancillary elements to be monitored, respective optical branches branching from the optical fiber path, wherein each optical branch includes at least one passive optical attenuator operatively coupled to, and having an attenuation adapted to change in response to a change in operating conditions of the respective ancillary element, and an optical reflector; an optical radiation source adapted to inject optical radiation into the optical fiber path; and an optical receiver adapted to detect back-reflected optical radiation reflected by the optical reflector; the monitoring system being further adapted to recognize a position of at least one of the ancillary elements based on a characteristic of the back-reflected optical radiation.
    Type: Grant
    Filed: November 24, 2006
    Date of Patent: May 22, 2012
    Assignee: Prysmian S.p.A.
    Inventors: Davide Sarchi, Roberto Gaspari, Giacomo Coletta, Giovanni Villani
  • Patent number: 8160454
    Abstract: Disclosed herein is a visible-light communication system according to one embodiment of the invention. The system comprises two apparatus. One apparatus emits a visible light beam on which is superimposed transmission data. From the void data represented by the visible light beam, the other apparatus generates a retroflected light beam, superimposes transmission data on the retroflected light beam, and applies the retroflected light beam to the apparatus. On receiving the retroflected light beam, the apparatus identifies the transmission data coming from the other apparatus, on the basis of the identification data superimposed on the retroflected light beam.
    Type: Grant
    Filed: June 17, 2009
    Date of Patent: April 17, 2012
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Shigehito Shimada, Katsuyoshi Suzuki
  • Patent number: 8150267
    Abstract: An optical interconnect includes a reflective body having a plurality of faces, where the body is translatable in a plane; and an optical receiver configured to receive optical energy reflected by at least one of the faces.
    Type: Grant
    Filed: April 18, 2007
    Date of Patent: April 3, 2012
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventors: Michael Cumbie, Jong-Souk Yeo, Robert Bicknell
  • Patent number: 8135286
    Abstract: Methods of providing duplex free-space optical, communication comprising receiving a time-shift keying (TSK) encoded signal and selectively re-modulating—and optionally retro-reflecting —received TSK pulses so as to transmit an on-off keying (OOK) signal wherein modulation is achieved by operating a micro-opto-electronic mechanical system (MOEMS) device having a oscillation period, the difference in timing between logic 1 and logic 0 pulses of the TSK encoded signal being such that each pulse arrives at a time within a single MOEMS device oscillation period chosen to ensure high or low transmissivity through the MOEMS device independent of incident TSK encoded signal pulse value (0 or 1).
    Type: Grant
    Filed: October 19, 2006
    Date of Patent: March 13, 2012
    Assignee: Qinetiq Limited
    Inventors: Kevin Dennis Ridley, Andrew Maxwell Scott, Steven Matthew Stone, Andrew Charles Lewin
  • Patent number: 8131156
    Abstract: An optical system and method includes a source-free optical network unit coupled to an optical fiber for receiving a centralized lightwave carrier signal with downstream data over the optical fiber. The optical network unit includes a coupler configured to split the original carrier signal into a first path and a second path. The first path includes an optical filter configured to reduce fading effects of the carrier signal. The second path includes a modulator configured to remodulate the centralized lightwave carrier signal with upstream data to produce an upstream data signal for upstream transmission.
    Type: Grant
    Filed: September 22, 2008
    Date of Patent: March 6, 2012
    Assignee: NEC Laboratories America, Inc.
    Inventor: Jianjun Yu
  • Patent number: 8126332
    Abstract: Described is a method for controlling the wavelength of a laser in a wavelength division multiplexed (WDM) system. The method includes generating broadband light having a dithered optical power and a wavelength spectrum that includes a plurality of WDM wavelengths. The broadband light is spectrally filtered to generate a spectrally-sliced optical signal having a wavelength spectrum that includes one of the WDM wavelengths. The spectrally-sliced optical signal is injected into a laser and a dithered optical power of the laser is determined. A parameter of the laser is controlled in response to the determination of the dithered optical power to thereby align a wavelength of the laser to the wavelength spectrum of the spectrally-sliced optical signal.
    Type: Grant
    Filed: August 20, 2008
    Date of Patent: February 28, 2012
    Assignee: LG-Ericsson Co., Ltd.
    Inventors: John Bainbridge, Tom Luk, Bin Cao
  • Patent number: 8050569
    Abstract: A device for optical remote monitoring, preferably an optically readable membrane-based microphone, and a system including such a device is provided. The device for optical remote monitoring includes a retroreflector and an acoustic membrane. The acoustic membrane suitably is a light-modulating component and modulates the reflection of an incident light beam in relation to the pressure field, from a sound source, to which the membrane is exposed. The retroreflector may be a corner cube having three sides with the membrane arranged on one of the sides. The membrane can be part of a side or one side may consist of a membrane.
    Type: Grant
    Filed: December 8, 2005
    Date of Patent: November 1, 2011
    Assignee: Totalförsvarets Forskningsinstitut
    Inventors: Hans Habberstad, Fredrik Kullander, Ove Steinvall
  • Patent number: 8032016
    Abstract: An arrangement is provided for transporting information from a central information distribution center (CIDC) to locations where such information is intended. Upon receiving a request for narrowcast information to be delivered to a node associated with a head end, the CIDC selects the requested information, generates an optical signal encoded with the requested information using information channels dedicated to narrowcast information transport for the node, and sends the optical signal to the head end via an optical fiber. When the head end receives the optical signal, the narrowcast information transport channels dedicated to the node are translated into subcarriers acceptable to the node before the requested narrowcast information is forwarded to the node.
    Type: Grant
    Filed: February 13, 2003
    Date of Patent: October 4, 2011
    Assignee: ARRIS Group, Inc.
    Inventors: Irl N. Duling, Sandeep T. Vohra, Paul J. Matthews
  • Patent number: 7978978
    Abstract: Systems and methods for encoding information in the topology of superpositions of helical modes of light, and retrieving information from each of the superposed modes individually or in parallel. These methods can be applied to beams of light that already carry information through other channels, such as amplitude modulation or wavelength dispersive multiplexing, enabling such beams to be multiplexed and subsequently demultiplexed. The systems and methods of the present invention increase the number of data channels carried by a factor of the number of superposed helical modes.
    Type: Grant
    Filed: April 13, 2010
    Date of Patent: July 12, 2011
    Assignee: New York University
    Inventor: David G. Grier
  • Patent number: 7945311
    Abstract: A marker-tracking system includes an object, a marker illuminating device, a marker sensing device, and a computing device. The object includes a first retroreflective marker having a shape that is substantially defined by two spherical caps of different radii that are disposed substantially concentric in relation to one another. The marker illuminating device substantially illuminates the first retroreflective marker, the marker sensing device detects the illuminated first retroreflective marker and generates first data indicative of the location of the illuminated first retroreflective marker in space, and the computing device processes the first data generated by the marker sensing device to determine a position and/or orientation of the object in space.
    Type: Grant
    Filed: February 9, 2007
    Date of Patent: May 17, 2011
    Assignee: Northern Digital Inc.
    Inventors: Bradley J. McCloy, Georg Brunner
  • Patent number: 7907849
    Abstract: A communication system, the communication system includes: a first decision entity; and a long laser that includes a first reflector and a second reflector; wherein a lasing characteristic of the long laser is responsive to: (i) first data unit that is provided by a first user and affects a reflection spectrum of the first reflector, and (ii) second data unit that is provided by a second user and affects a reflection spectrum of the second reflector; and wherein the first decision entity is adapted to receive the first data unit and information representative of the lasing characteristic, as well as to determine (i) a relationship between the first data unit and the second data unit, or (ii) a content of the second data unit.
    Type: Grant
    Filed: March 15, 2007
    Date of Patent: March 15, 2011
    Assignee: Ramot At Tel-Aviv University Ltd.
    Inventor: Jacob Scheuer
  • Patent number: 7899332
    Abstract: An optical communication unit performs a bidirectional information transmission between a circuit device in a fixed housing and a circuit device in a moving housing with an optical signal. The optical communication unit includes a light transmitting unit that transmits the optical signal, a light receiving unit that receives the optical signal from the light transmitting unit, and a light propagation path for propagating the optical signal from the light transmitting unit to the light receiving unit. The light propagation path is disposed inside a hinge part that links the fixed housing and the moving housing in an openable and closable manner.
    Type: Grant
    Filed: December 28, 2005
    Date of Patent: March 1, 2011
    Assignee: Fujitsu Limited
    Inventors: Noriaki Shindou, Masahiro Taguchi, Masaaki Saitou, Nobuaki Hatanaka
  • Patent number: 7889997
    Abstract: 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 outputting the electrical signal; a reflector for retro-reflecting the others of the optical signal incident on the concave grooves, the reflector having a reflection surface on which at least one concave groove is formed; and a modulator for outputting the retro-reflected optical signal after data modulation.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: February 15, 2011
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Eun-Tae Won
  • Patent number: 7860401
    Abstract: A method for point-to-point communication over an optical channel is provided. An optical beam is received at a first corner cube modulated retro-reflector. Simultaneously, the optical beam is received at a second corner cube modulated retro-reflector. The first and second corner cube modulated retro-reflectors are adjacent to each other, are co-boresighted, and have an aggregate diameter that is smaller than the far-field Instantaneous Field of View of a receiver. The optical beam is modified by the first corner cube modulated retro-reflector by adding a first modulation to the optical beam, forming a first modulated optical beam. Simultaneously, the optical beam is modified by the second corner cube modulated retro-reflector by adding a second modulation to the optical beam, forming a second modulated optical beam. The first modulated optical beam and the second modulated optical beam combine to form a modified optical wavefront, which is reflected to a sender.
    Type: Grant
    Filed: December 13, 2007
    Date of Patent: December 28, 2010
    Assignee: The Boeing Company
    Inventor: Jonathan M. Saint Clair
  • 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: 7769295
    Abstract: A micro-optic dual beam-splitter assembly comprises at least two beam-splitter optical filters and at least one photoreceptor. Each of the beam-splitter optical filters comprises an optical substrate having at least a coated or uncoated optical tap surface and a filter surface carrying a thin-film optical filter. The thin-film optical filters are substantially normal to the optical path from an optical signal source. Each of the optical tap surfaces is operative as an optical beam splitter to tap off an optical tap signal. The one or more photoreceptors are arranged to receive both or at least one of the optical tap signals. The tap signals comprise a portion of the optical signals passed along the optical path to the optical filter chips. The filter chips are cooperatively transmissive to an optical signal output port of a selected set of wavelengths received from the optical signal source along the optical path, and are reflective of other wavelengths.
    Type: Grant
    Filed: August 27, 2007
    Date of Patent: August 3, 2010
    Assignee: Bookham Technology plc
    Inventors: Rad Sommer, Jill Oosterom, Claude Gamache
  • Patent number: 7742700
    Abstract: Systems and methods for encoding information in the topology of superpositions of helical modes of light, and retrieving information from each of the superposed modes individually or in parallel. These methods can be applied to beams of light that already carry information through other channels, such as amplitude modulation or wavelength dispersive multiplexing, enabling such beams to be multiplexed and subsequently demultiplexed. The systems and methods of the present invention increase the number of data channels carried by a factor of the number of superposed helical modes.
    Type: Grant
    Filed: June 3, 2009
    Date of Patent: June 22, 2010
    Assignee: New York University
    Inventor: David G. Grier
  • 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: 7715727
    Abstract: A system and method for encoding an analog input signal for optical transmission, including driving a voltage controlled oscillator with an analog input signal to produce a frequency modulated electrical signal having a frequency proportional to the amplitude of the input signal, and applying the frequency modulated electrical signal to a multiple quantum well modulating retroreflector. The retroreflector receives optical energy from a laser source and modulates the optical energy with the frequency modulated signal to produce an output optical signal.
    Type: Grant
    Filed: August 1, 2006
    Date of Patent: May 11, 2010
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: James L Murphy, William S Rabinovich, G Charmaine Gilbreath, Peter G Goetz
  • Patent number: 7693426
    Abstract: System and techniques for transmitting information from a remote information source use a reflector for reflecting a laser beam or other light source back to its originating location. A reflector coupled to an information source receives a laser beam from a laser source. A movement of at least one surface of the reflector is controlled to modulate the laser beam, and the modulated laser beam is reflected toward the laser source. The modulated laser beam can be received by a receiver at or near the laser source to detect and decode data embedded in the modulated laser beam.
    Type: Grant
    Filed: December 18, 2003
    Date of Patent: April 6, 2010
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: David M. Pease
  • Patent number: 7546037
    Abstract: Systems and methods for encoding information in the topology of superpositions of helical modes of light, and retrieving information from each of the superposed modes individually or in parallel. These methods can be applied to beams of light that already carry information through other channels, such as amplitude modulation or wavelength dispersive multiplexing, enabling such beams to be multiplexed and subsequently demultiplexed. The systems and methods of the present invention increase the number of data channels carried by a factor of the number of superposed helical modes.
    Type: Grant
    Filed: September 8, 2005
    Date of Patent: June 9, 2009
    Assignee: New York University
    Inventor: David G. Grier
  • Patent number: 7486893
    Abstract: The disclosed technology provides a dynamic interconnection system which allows to couple a pair of optical beams carrying modulation information. In accordance with the disclosed technology, two optical beams emanate from transceivers at two different locations. Each beam may not see the other beam point of origin (non-line-of-sight link), but both beams can see a third platform that contains the system of the disclosed technology. Each beam incident on the interconnection system is directed into the reverse direction of the other, so that each transceiver will detect the beam which emanated from the other transceiver. The system dynamically compensates for propagation distortions preferably using closed-loop optical devices, while preserving the information encoded on each beam.
    Type: Grant
    Filed: August 15, 2005
    Date of Patent: February 3, 2009
    Assignee: HRL Laboratories, LLC
    Inventors: David M. Pepper, Richard P. Berg
  • Publication number: 20080279557
    Abstract: Disclosed are a wavelength division multiplexing-passive optical network (WDM-PON) system using self-injection locking, an optical line terminal thereof, and a data transmission method. A wavelength division multiplexing-passive optical network (WDM-PON) system according to an aspect of the invention includes an optical line terminal. The optical line terminal includes a reflector that is installed at the input side of a multiplexer and reflects an optical signal having a predetermined wavelength, and a light source that generates a multimode optical signal to transmit the generated multimode optical signal to the multiplexer through the reflector, receives reflected light by the reflector, and oscillates at a wavelength of the received reflected light.
    Type: Application
    Filed: April 30, 2008
    Publication date: November 13, 2008
    Applicant: Gwangju Institute of Science and Technology
    Inventors: Chang-Soo Park, Tae-Young Kim, Seung Hyeon Baek, Seung Heon Han
  • Patent number: 7403712
    Abstract: 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 inputs receiving a respective optical wavelength; and the matrix switch having an output that produces a series of interleaved pulses of the different optical wavelengths.
    Type: Grant
    Filed: February 22, 2005
    Date of Patent: July 22, 2008
    Assignee: Northrop Grumman Corporation
    Inventors: David B. Hall, Paul L. Greene
  • Patent number: 7366423
    Abstract: 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 the optical bus can include a reflective device such a mirror, a semi reflective mirror, a pellicle beamsplitter, or the like. The low speed signals can be, for example, power, ground, and supervisory signals. The high speed signals can be, for example, data, address, control, and clock signals.
    Type: Grant
    Filed: December 31, 2002
    Date of Patent: April 29, 2008
    Assignee: Intel Corporation
    Inventors: Paul S. Levy, Karl H. Mauritz
  • Patent number: 7336898
    Abstract: 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 non-intrusively to the fiber optic cable adjacent the cover, the communications receiver being responsive to the presence or absence of an access authorization signal from an operator to cause the modulator to introduce a signal to the fiber optic cable indicative of the authorization status.
    Type: Grant
    Filed: January 12, 2004
    Date of Patent: February 26, 2008
    Assignee: Radiodetection Limited
    Inventors: Richard William Fling, Barry Robert Fleury
  • Patent number: 7317876
    Abstract: 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) creates and sends a second frame (420) in a first reflected beam (108) formed by the retro-reflector device (302) reflecting the input beam (106) along a path closely aligned with a path of the input beam. At least one of the first frame (400) and the second frame (420) includes medium access control information. In some implementations, the first frame (400) may include a data throughput rate (404, 406), a preamble (402) and an error correction code (412).
    Type: Grant
    Filed: February 26, 2004
    Date of Patent: January 8, 2008
    Assignee: BBN Technologies Corp.
    Inventor: Brig Barnum Elliott
  • Patent number: 7308207
    Abstract: 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 back to the light transceiver as an input light beam. The dynamic optical tag includes a controllable light reflector that is controllable between a reflective state and a non-reflective state and having a modulation signal input, and a controller that provides the modulation signal input to the controllable light reflector. In operation, the interrogator transmits an interrogation light beam from the light transceiver to the dynamic optical tag, the dynamic optical tag reflects a modulated interrogation light beam back to the light transceiver as the input light beam, and the light transceiver receives and analyzes the input light beam to determine an identity of the dynamic optical tag and the interrogated object.
    Type: Grant
    Filed: November 17, 2003
    Date of Patent: December 11, 2007
    Assignee: Raytheon Company
    Inventor: Chungte W. Chen
  • Patent number: 7254340
    Abstract: 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-back light sources through a WDM MUX/DEMUX in a remote node (RN). The power levels of downstream and upstream WDM optical signals are measured. The WDM wavelengths of the multi-frequency light source and the WDM MUX/DEMUX are controlled to be nearly identical in order to minimize the difference between the power levels of the downstream and upstream WDM optical signals.
    Type: Grant
    Filed: February 17, 2004
    Date of Patent: August 7, 2007
    Assignee: Samsung Electronics Co., Ltd.
    Inventors: Dae-Kwang Jung, Yun-Je Oh, Seong-Taek Hwang
  • Patent number: 7184670
    Abstract: 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 sensors. The first plurality of subsystems is configured to receive the analog signals from the acoustic sensors and generate digital values based on the received analog signals. The system includes a first optical splitter. A first optical transmitter transmits a first set of optical pulses to the first optical splitter. The first optical splitter is configured to transmit the first set of optical pulses to each subsystem in the first plurality of subsystems. Each subsystem in the first plurality of subsystems is configured to modulate the first set of optical pulses based on the generated digital values and thereby generate a modulated optical pulse stream.
    Type: Grant
    Filed: May 2, 2001
    Date of Patent: February 27, 2007
    Assignee: Lockheed Martin Corporation
    Inventor: VanWinkle (Van) T. Townsend
  • Patent number: 7139483
    Abstract: 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.
    Type: Grant
    Filed: March 27, 2003
    Date of Patent: November 21, 2006
    Assignees: Sumitomo Electric Industries, Ltd., Keio University
    Inventors: Toru Murase, Masayuki Shigematsu, Iwao Sasase, Katsuhiro Kamakura
  • Patent number: 7113707
    Abstract: 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 the other beam point of origin (non-line-of-sight link), but both beams can see a third platform that contains the system of the present invention. Each beam incident on the interconnection system is directed into the reverse direction of the other, so that each transceiver will detect the beam which emanated from the other transceiver. The system dynamically compensates for propagation distortions preferably using closed-loop optical devices, while preserving the information encoded on each beam.
    Type: Grant
    Filed: May 3, 2001
    Date of Patent: September 26, 2006
    Assignee: HRL Laboratories, LLC
    Inventor: David M. Pepper
  • Patent number: 7095962
    Abstract: 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 optical elements, and output ports. Assume that maximum one and minimum one of optical distances between the input optical elements and the output optical elements are DL and DS, respectively. Then, the beam waist position Q of the laser beam output from the input optical element closest to the input port satisfies a relation: 0.9(DL+DS)/4?Q?1.1(DL+DS)/4.
    Type: Grant
    Filed: August 27, 2002
    Date of Patent: August 22, 2006
    Assignee: Denso Corporation
    Inventor: Hiro Karube
  • Patent number: 7054563
    Abstract: 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 transmission signal. The light receiving apparatus has a light source and a demodulating circuit for demodulating the transmission signal modulated by the modulator from the light emitted from the light source and reflected from the retroreflector. The modulator includes a plurality of optical reflection devices arranged on a reflection plane of the retroreflector and capable of controlling optical reflection independently of each other and a circuit for separately controlling each of the optical reflection devices. The demodulating circuit includes a CCD having a plurality of photoreceptors arranged correspondingly to the arrangement of the optical reflection devices.
    Type: Grant
    Filed: February 5, 2001
    Date of Patent: May 30, 2006
    Assignee: Tsumura Research Institute Co.
    Inventor: Toshihiro Tsumura