Patents Examined by Nathan M Curs
  • Patent number: 8233801
    Abstract: A subsea monitoring system.
    Type: Grant
    Filed: August 18, 2008
    Date of Patent: July 31, 2012
    Assignee: Vetco Gray Inc.
    Inventors: Daniel Sexton, John Erik Hershey, John Carbone, Lynn Ann Derose, John Anderson Ross, Todd Tolliver, Michael Dell'Ano
  • Patent number: 8081880
    Abstract: A new transmission link configuration with remote Er post- and pre-amplifiers where pump power is shared between a pair of fibers carrying traffic in opposite directions is proposed. A budget increase of >4 dB is demonstrated.
    Type: Grant
    Filed: December 19, 2007
    Date of Patent: December 20, 2011
    Assignee: MPB Communications Inc.
    Inventor: Serguei Papernyi
  • Patent number: 7995918
    Abstract: A method and apparatus for a monitoring technique for the rate of change of polarization state and of the polarization mode dispersion is proposed. This technique is used for performance monitoring and fault correlation as well as for the verification of commitments to customers with respect to the transmission system's tolerance to polarization mode dispersion.
    Type: Grant
    Filed: October 31, 2006
    Date of Patent: August 9, 2011
    Assignee: Alcatel Lucent
    Inventors: Lutz Raddatz, David Stahl
  • Patent number: 7995916
    Abstract: To verify the integrity of optical paths through and among optical switches, optical signals are provided with co-propagating supplemental signals. The supplemental signals preferably have at least one characteristic which allows distinguishing one supplemental signal from another. Associated with a port of a switch, means are provided for detecting a supplemental signal and determining if the supplemental signal indicates that a desired optical signal is passing through the port as expected and desired. Means for imparting or changing the distinguishing characteristic of a supplemental signal may also be employed to facilitate verifying the passage of optical signals.
    Type: Grant
    Filed: November 2, 2005
    Date of Patent: August 9, 2011
    Assignee: Verizon Business Global LLC
    Inventors: John A. Fee, Frank A. McKiel, Jr.
  • Patent number: 7991297
    Abstract: A method for generating D-N-PSK optical signals is disclosed wherein a laser is modulated to generate optical signal pairs including phase modulated and fixed phase portions, the phase modulated portions having a frequency encoding one or more data symbols and the fixed phase portion having a carrier frequency and a phase corresponding to the immediately preceding phase modulated portion. The output of the laser is passed through an optical spectrum reshaper having a transmission function chosen to attenuate a plurality of the phase modulated portions relative to the fixed phase portions. The phase modulated portions may have N frequency levels located on either side of the carrier frequency. One of the N frequency levels may be equal to the carrier frequency.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: August 2, 2011
    Assignee: Finisar Corporation
    Inventors: Daniel Mahgerefteh, Xueyan Zheng, Yasuhiro Matsui, Parviz Tayebati, Andrew C Singer
  • Patent number: 7991299
    Abstract: An exemplary aspect of the invention is an optical transmitter that emits a light signal, including: a light source; a Mach-Zehnder optical modulator; a modulator driver; a wavelength information holder; and a driving voltage controller, wherein the Mach-Zehnder optical modulator modulates the light intensity of output light from the light source by use of a modulator driving signal, the modulator driver outputs the modulator driving signal according to an input data signal, the wavelength information holder holds wavelength information on the output light of the light source, the driving voltage controller outputs, to the modulator driver, a control signal for setting the latest driving voltage, according to the wavelength information from the wavelength information holder.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: August 2, 2011
    Assignee: NEC Corporation
    Inventors: Morihiko Ota, Tadashi Koga
  • Patent number: 7986882
    Abstract: A current pumping circuit includes a voltage detector, a boost circuit, and an output circuit. The voltage detector detects a level of a power voltage and outputs a corresponding control signal. The boost circuit controls the power voltage to be maintained at a predetermined level based on the control signal. The output circuit provides an output signal regardless of the level of the detected voltage. The output circuit may include or be coupled to a data converter, which generates the output signal based on a transmission signal and the boosted power voltage. The transmission signal may be one output from a predetermined control circuit.
    Type: Grant
    Filed: January 15, 2008
    Date of Patent: July 26, 2011
    Assignees: LG Electronics Inc., Eta Chips Co., Ltd
    Inventors: Jun-Ho Seo, Jeong-Woo Lee
  • Patent number: 7983571
    Abstract: The apparatus includes a pulse emitter and at least one line fiber for conveying at least one pulse in the line fiber. A spreader module for linearly spreading pulses is provided including a propagation medium that is dispersive and linear. The propagation medium presents accumulated chromatic dispersion that is high enough to lower the peak power of the pulse to below a predetermined threshold, where a signal above the threshold is subjected to non-linear distortion in the line fiber. The spreader module is disposed between the emitter and the line fiber.
    Type: Grant
    Filed: January 29, 2004
    Date of Patent: July 19, 2011
    Assignee: France Telecom
    Inventor: Erwan Pincemin
  • Patent number: 7983563
    Abstract: Systems, networks, and methods of providing an Internet protocol routing network are disclosed. One Internet protocol routing network includes: a number of local subnet routers, where the routers are Internet protocol (IP) enabled; a single mode optical fiber cable, where the local subnet routers are coupled to the optical fiber cable; and one or more optical code division multiple access (OCDMA) encoder/decoder coupled to the optical fiber cable, where a number of channels associated with the local subnet routers are assigned an OCDMA signature code.
    Type: Grant
    Filed: November 8, 2007
    Date of Patent: July 19, 2011
    Assignee: Lockheed Martin Corporation
    Inventors: Brian L. Uhlhorn, Howard J. Schantz
  • Patent number: 7965939
    Abstract: A system for providing bi-directional RF services over relating to a point-to-multipoint Passive Optical Network (PON).
    Type: Grant
    Filed: June 15, 2007
    Date of Patent: June 21, 2011
    Assignee: Northpeak Enterprises, Inc.
    Inventors: Ketan Gadkari, Tom Warner
  • Patent number: 7965943
    Abstract: An optical rotating data transmission device comprises a first collimator arrangement for coupling-on first light-waveguides, and a second collimator arrangement for coupling-on second light-waveguides, which is supported to be rotatable relative to the first collimator arrangement about a rotation axis. A Dove prism is provided between the collimator arrangements as a derotating element. Furthermore, the collimator arrangements pre provided with adapter elements having rotationally symmetrical conical faces. Prism adapter elements are disposed on the end faces of the Dove prism and have prism adapter elements on the sides facing the collimator arrangements. These also have rotationally symmetrical conical faces with a surface configuration that is inverse to that of the adapter elements of the collimator arrangements.
    Type: Grant
    Filed: December 21, 2007
    Date of Patent: June 21, 2011
    Assignee: Schleifring und Apparatebau GmbH
    Inventors: Gregor Popp, Josef Bräu, Matthias Rank
  • Patent number: 7965944
    Abstract: A system for passively scrambling and unscrambling a, pulse optical signal transmitted through a multi-mode optical fiber is provided. The system includes a scrambling unit connected between a signal receiving end of said transmission fiber and an optical signal source that includes an optical fiber which creates a differential delay between two groups of optical modes of the signal that is at least one bit period long such that said optical signal is passively scrambled, and an unscrambling unit connected to a signal transmitting end of said transmission fiber having an optical fiber that counteracts said differential delay between said two groups of optical modes of the signal such that said optical signal is passively unscrambled.
    Type: Grant
    Filed: May 18, 2007
    Date of Patent: June 21, 2011
    Assignee: Corning Incorporated
    Inventors: Shenping Li, Dmitri Vladislavovich Kuksenkov, Daniel Aloysius Nolan
  • Patent number: 7962045
    Abstract: An optical transmitter is disclosed including a widely tunable laser coupled to a periodic optical spectrum reshaper (OSR) to convert frequency modulated pulses from the laser into amplitude modulated pulses. The laser is tuned to generate pulses corresponding to passbands of the OSR spanning a wide range of frequencies. The laser includes a gain section having an optical path length substantially shorter than the total optical path length of the laser. The laser may be a Y-branch laser having reverse-biased sampled gratings or ring resonator filters tuned by stripe heaters. The laser may also include a reflective external cavity section tunable by modulating the temperature of ring resonators or etalons. The OSR may be integrally formed with the external cavity of the ECL laser.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: June 14, 2011
    Assignee: Finisar Corporation
    Inventors: Kevin John McCallion, Yasuhiro Matsui, Daniel Mahgerefteh
  • Patent number: 7962046
    Abstract: The present application is directed to an apparatus and method for the automated compensation of dispersion over a broad wavelength range for coherent optical pulses. In one embodiment, the present application discloses an automatic dispersion compensating optical apparatus configured to change chirp introduced into an optical signal by an optical system in optical communication with the dispersion compensating optical apparatus and includes at least one wavelength-tunable source of coherent optical pulses configured to output at least one optical signal, at least one dispersion compensation device configured to receive the optical signal from the coherent source, and at least one controller in communication with the dispersion compensation device and configured to adjust chirp introduced into the optical signal by the dispersion compensation device as the wavelength of the optical signal is varied.
    Type: Grant
    Filed: November 9, 2007
    Date of Patent: June 14, 2011
    Assignee: Newport Corporation
    Inventors: Dmitri A. Oulianov, Stefan Marzenell, Richard Boggy
  • Patent number: 7949256
    Abstract: A method is provided for increasing downstream bandwidth in an optical network that includes providing a downstream terminal comprising a digital output path and an analog output path. The method also includes receiving a signal comprising at least one wavelength at the downstream terminal. The method further includes selectively processing the signal at the downstream terminal. The signal is selectively processed at the downstream terminal by processing the signal on the analog output path if the signal comprises analog video data and processing the signal on the digital output path if the signal comprises data to be converted to a digital bit stream.
    Type: Grant
    Filed: January 5, 2007
    Date of Patent: May 24, 2011
    Assignee: Fujitsu Limited
    Inventors: Martin Bouda, Takao Naito
  • Patent number: 7945174
    Abstract: The invention provides a system and method for secure communication that involves encoding and transmitting an optical communications signal that is encoded based on a multi-dimensional encoding technique. This technique may include at least one or more of encoding a phase, a polarization, and a frequency of the signal. Light encoding is independent from its modulation with data. The data is modulated using any format; in the preferred embodiment the QPSK format is implemented. The encoded and modulated light is transmitted through free space or via a fiber optic network to a receiver, where the information is decoded. A coherent detection based on 90-degrees or 120-degrees optical hybrid is used to decode and recover the data from the received signal. Because the encoding of the transmitted light varies according to a specific pattern or sequence, one without knowledge of the transmission encoding sequence is prevented from decoding the transmitted information.
    Type: Grant
    Filed: February 8, 2008
    Date of Patent: May 17, 2011
    Assignee: CeLight, Inc.
    Inventors: Isaac Shpantzer, Nadejda Reingand, Aviv Salamon
  • Patent number: 7941057
    Abstract: An optical transmitter is disclosed for transmitting a signal along a dispersive medium to a receiver. The optical transmitter generates adiabatically chirped profile having an initial pulse width and frequency excursion chosen such that high frequency data sequences include one bits that interfere destructively at a middle point of an intervening zero bit upon arrival at the receiver.
    Type: Grant
    Filed: December 26, 2007
    Date of Patent: May 10, 2011
    Assignee: Finisar Corporation
    Inventors: Daniel Mahgerefteh, Parviz Tayebati, Xueyan Zheng, Yasuhiro Matsui
  • Patent number: 7941050
    Abstract: Free space optical communication methods and systems, according to various aspects are described. The methods and systems are characterized by transmission of data through free space with a digitized optical signal acquired using wavelength modulation, and by discrimination between bit states in the digitized optical signal using a spectroscopic absorption feature of a chemical substance.
    Type: Grant
    Filed: January 11, 2008
    Date of Patent: May 10, 2011
    Assignee: Battelle Memorial Institute
    Inventors: Warren W. Harper, Pamela M. Aker, Richard M. Pratt
  • Patent number: 7936994
    Abstract: Disclosed is a broadband light source (BLS) necessary to implement wavelength-locked Fabry-Perot (FP) laser diodes (LDs) applicable to an optical subscriber network The BLS is based on a method using mutual injection of low-cost FP LDs and a method using FP LDs undergoing chirping. A power level of a light emitting diodes (LED), an erbium-doped fiber amplifier (EDFA), or a super luminescent diode (SLD) used as the conventional BLS is low and its cost is high, such that the conventional BLS is inefficient. However, the present invention can easily implement a low-cost BLS using proposed FP LDs.
    Type: Grant
    Filed: December 22, 2004
    Date of Patent: May 3, 2011
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Chang-Hee Lee, Jin-serk Baik, Ki-Man Choi, Hyun-Sik Min, Keun-Youl Park
  • Patent number: 7920798
    Abstract: A receiver converts an analog signal, derived from light pulses in a GPON fiber optic system, to clean digital electrical signals. A photodetector and transimpedance amplifier (TIA) convert the light pulses to analog electrical signals. A reset signal generated by a media access controller (MAC) in the GPON system signifies the start of a new burst of data. The receiver has a switchable low pass filter that establishes the threshold voltage for determining whether the analog signal is a logical 1 or a logical 0. At the very start of a new burst, the low pass filter has a fast time constant to quickly establish the threshold voltage for the burst. At a later time during the burst, the low pass filter is switched to have a slow time constant to create a relatively stable threshold voltage.
    Type: Grant
    Filed: June 18, 2007
    Date of Patent: April 5, 2011
    Assignee: Micrel, Inc.
    Inventors: Thomas S. Wong, Katherine T. Hoang