Amplifier Or Repeater Operation Patents (Class 398/37)
  • Patent number: 10171057
    Abstract: In conventional optical receivers the dynamic range is obtained by using variable gain amplifiers (VGA) with a fixed trans-impedance amplifier (TIA) gain. To overcome the SNR problems inherent in conventional receivers an improved optical receiver comprises an automatic gain control loop for generating at least one gain control signal for controlling gain of both the VGA and the TIA. Ideally, both the resistance and the gain of the TIA are controlled by a gain control signal.
    Type: Grant
    Filed: March 21, 2018
    Date of Patent: January 1, 2019
    Assignee: Elenion Technologies, LLC
    Inventors: Mostafa Ahmed, Alexander Rylyakov
  • Patent number: 9369203
    Abstract: Systems and apparatus for a wirelessly-powered passive optical power meter device. In one aspect, an optical power meter device comprises a power circuit connected to one or more antennas, the circuit including an RF to DC converter that generates a DC power signal that provides a DC power source for the optical power meter from an RF signal received by the one or more antennas, a photodetector that generates a power measurement signal that measures the power of the optical input signal, and a communication circuit that is connected to the one or more antennas, the photodetector, and the power circuit that when powered by the DC power source generates a modulation signal that is responsive to the power measurement signal and that causes the one of the one or more antennas to convey the power measurement signal to a reader device that is transmitting the RF signal.
    Type: Grant
    Filed: June 11, 2014
    Date of Patent: June 14, 2016
    Assignee: Google Inc.
    Inventor: Yut Loy Chan
  • Patent number: 9172464
    Abstract: A handshake synchronization method and system based on visible light communication are provided. The method includes: connecting, by a transmitting end, in which a state machine varies with unit time, to a receiving end, the status of a state machine of the receiving end being synchronized with the status of the state machine of the transmitting end; using, by the transmitting end, a pseudocode signal which varies with unit time, to scramble an original signal and a pilot optical signal, and sending, in the form of a visible light signal, the scrambled signal obtained by scrambling; and receiving, by the receiving end, the visible light signal, identifying the scrambled signal of the current period of time by using a pilot optical signal, and decrypting the original signal according to the scrambled signal. Since a visible light signal which is transmitted between a transmitting end and a receiving end is not an original signal, the security of a photonic Internet of Things is improved.
    Type: Grant
    Filed: May 7, 2013
    Date of Patent: October 27, 2015
    Assignee: KUANG-CHI INNOVATIVE TECHNOLOGY LTD.
    Inventors: Ruopeng Liu, Lin Luan, Guangjin Xiao
  • Patent number: 9020366
    Abstract: Provided are a polarization multiplexing optical receiving device and a polarization multiplexing optical receiving method with which a mismatch of optical intensity between polarized signals accumulated in an optical transmission path of an optical receiving system can be compensated with high precision, and a high-quality polarized optical signal can be received.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: April 28, 2015
    Assignee: NEC Corporation
    Inventor: Takeshi Okamoto
  • Patent number: 9020340
    Abstract: An optical packet switching system includes a plurality of network elements for transmitting and receiving optical packet signals. Each network element includes an optical signal-to-noise ratio (OSNR) acquiring unit for acquiring the OSNR of each optical packet signal, an average value calculating unit for calculating the average value of the OSNRs of optical packet signals received within a predetermined time duration for each of the plurality of source network elements, and a difference information transmitter for calculating the difference between the calculated average value of the OSNRs and a target value of the OSNRs and then transmitting the difference to a network element corresponding to the difference. A source network element that has received the difference information adjusts the characteristics of an optical packet signal to be transmitted in a manner such that the difference is reduced.
    Type: Grant
    Filed: July 5, 2012
    Date of Patent: April 28, 2015
    Assignee: Fujitsu Telecom Networks Limited
    Inventor: Reiko Sato
  • Patent number: 9020337
    Abstract: A local oscillation light source outputs locally-oscillated light. An light receiving unit phase-separates an input optical signal by making the optical signal interfere with the locally-oscillated light and outputs an analog electric signal corresponding to the phase-separated optical signal. An analog-to-digital converting unit converts the analog electric signal into a digital signal. A processing unit performs digital signal processing by using the digital signal. A failure detection unit determines whether or not the optical signal is being input to the light receiving unit, or detects a failure in the light receiving unit, the analog-to-digital converting unit or the processing unit based on light intensity of the optical signal, whether or not the analog electric signal can be generated in the light receiving unit, and an amplitude of the analog electric signal output from the light receiving unit.
    Type: Grant
    Filed: June 14, 2013
    Date of Patent: April 28, 2015
    Assignee: NEC Corporation
    Inventor: Takashi Tsubouchi
  • Patent number: 9021086
    Abstract: System and methods for inferring network topology are described, including a method comprising determining a normalized transmit power of a first device, identifying a second device based upon a parameter of the second device and the normalized transmit power of the first device, and generating a topology including the first device and the second device based upon at least one of the normalized transmit power of the first device and the parameter of the second device.
    Type: Grant
    Filed: October 21, 2011
    Date of Patent: April 28, 2015
    Assignee: Comcast Cable Communications, LLC
    Inventors: Lawrence Wolcott, Justin Riggett, Bryan Johnston
  • Publication number: 20150086197
    Abstract: The light reception unit is disposed behind each of a plurality of light sources that emits signal lights having mutually different wavelengths in a forward direction and receives a backlight emitted backward from each of the light sources. The synchronizing signal generation unit generates a synchronizing signal serving as an electric signal synchronized in phase with a drive signal for driving each of the light sources. The multiplication unit multiplies the synchronizing signal and a light reception signal serving as an electric signal obtained by receiving the backlight by the light reception unit. The light power detection unit detects power of the signal light by multiplying an integrated value of a multiplication signal obtained by multiplying the synchronizing signal and the light reception signal by the multiplication unit and a power ratio of the signal light to the backlight stored in a predetermined storage unit.
    Type: Application
    Filed: December 2, 2014
    Publication date: March 26, 2015
    Inventors: Naoki Yamamoto, Noriaki Mizuguchi
  • Patent number: 8989576
    Abstract: A method of processing optical signal (TE) whose power (PE) varies in a random manner in a range of variation of power (?PE) around a mean power (PE?), the processing of the optical signal (TE) generating processing noise (GELECTRONIC), characterized in that the relative variation of power (GE) of at least a temporal part at said optical signal (TE) is optically amplified.
    Type: Grant
    Filed: March 24, 2011
    Date of Patent: March 24, 2015
    Assignees: Universite de Bourgogne, CNRS—Centre National de Recherche Scientifique
    Inventors: Christophe Finot, Julien Fatome
  • Patent number: 8965209
    Abstract: An optical communication system comprises a network interface device (NID) having a media converter coupled to an optical fiber of a passive optical network (PON). The media converter converts optical signals from the PON into electrical signals for communication across at least one non-optical channel, such as a conductive or wireless connection, to customer premises equipment (CPE), such as a residential gateway or other customer premises (CP) device. Rather than implementing an optical media access control (optical MAC) layer in the NID, an optical MAC layer for handling PON protocols and management is implemented by the CPE, thereby effectively extending the customer end of the PON across at least one non-optical connection to the CPE. By implementing the optical MAC layer at the CPE, the complexity of the NID is reduced thereby lowering the cost of the NID.
    Type: Grant
    Filed: July 7, 2011
    Date of Patent: February 24, 2015
    Assignee: ADTRAN, Inc.
    Inventors: Richard Goodson, Leif J. Sandstrom, Kevin W. Schneider
  • Patent number: 8958692
    Abstract: An optical transmission system includes a first node and a second node, the first node includes a first optical amplifier which outputs a signal to the second node through a first transmission line and a first monitoring unit, the second node includes a monitor which monitors a signal from the first transmission line, a second optical amplifier which outputs a signal to the first node through a second transmission line and a second monitoring unit, upon detecting disconnection from the first transmission line, the second monitoring unit transmits a notification for making power of the first optical amplifier reduced, upon receipt of the notification, the first monitoring unit reduces power of the first optical amplifier, and transmits a completion notification to the second monitoring unit, and upon not receiving the completion notification even after expiration of an allowed time, the second monitoring unit reduces power of the second optical amplifier.
    Type: Grant
    Filed: March 2, 2012
    Date of Patent: February 17, 2015
    Assignee: NEC Corporation
    Inventor: Yutaka Yano
  • Patent number: 8942565
    Abstract: The path selection and wavelength assignment to a selected path are performed by mapping the wavelength reach to the demand distribution (agile reach) resulting in a 50-60% increase in the network reach. The network reach is further increased (about 2.2 times) when on-line measured performance data are used for path selection and wavelength assignment. The connections may be engineered/upgraded individually, by optimizing the parameters of the entire path or of a regenerator section of the respective path. The upgrades include changing the wavelength, adjusting the parameters of the regenerator section, controlling the launch powers, mapping a certain transmitter and/or receiver to the respective wavelength, selecting the wavelengths on a certain link so as to reduce cross-talk, increasing wavelength spacing, etc.
    Type: Grant
    Filed: August 13, 2013
    Date of Patent: January 27, 2015
    Assignee: Alcatel Lucent
    Inventors: Alan Glen Solheim, Peter David Roorda, Kevan Peter Jones, Greg Peter Friesen
  • Patent number: 8938165
    Abstract: An optical transmission device according to the present invention comprises: a Raman amplification means; a main signal light sending means which sends first main signal light; a communication interruption detection light monitoring means which sends a first signal if it cannot detect communication interruption detection light; a main signal light monitoring means which sends a second signal if it cannot detect second main signal light; a light monitoring signal analysis means which sends a result of its analysis of a light monitoring signal as a third signal in a predetermined period of time; and a control means which makes the Raman amplification means suspend the generation of the excitation light, if it cannot receive the third signal even after the elapse of the predetermined period of time in the state it has received the first signal and has not received the second signal, and stops sending of the first main signal light from the main signal light sending means when receiving the second signal further.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: January 20, 2015
    Assignee: NEC Corporation
    Inventor: Noboru Iijima
  • Patent number: 8938166
    Abstract: In one embodiment, a smart small form-factor pluggable (SSFP) transceiver—compatible with SFP size, power, and interconnection standards—includes an optical transceiver, an electrical connector, a protocol processing engine, and a CPU. The SSFP transceiver is configured for use at a client site having no network interface device (NID). The SSFP transceiver (1) mates to a client's network device at an electrical interface within the network device and (2) connects to a network provider's central office (CO) node via an optical cable at an optical interface. The SSFP transceiver is configured to (1) be powered by the network device, (2) power-up upon mating with the network device, (3) be configured by a remote management agent (RMA) of the network provider for communication with the provider network, (4) respond to/generate Operation, Administration, and Management (OAM) messages from/for the CO node, and (5) provide OAM demarcation functions of a conventional NID.
    Type: Grant
    Filed: December 19, 2012
    Date of Patent: January 20, 2015
    Assignee: Alcatel Lucent
    Inventor: Stéphan Roullot
  • Publication number: 20150016819
    Abstract: Techniques are presented for automatic tuning of operating parameters, e.g., amplifier gain, in an optical network. A section of an optical network comprises a plurality of spans between optical nodes, and each optical node has an amplifier to amplify optical signals for transmission between optical nodes. Physical network layer data is obtained from the optical nodes for use as input to an analytical model. A set of powers defining an optimum working point of the amplifiers is computed based on variations in amplifier noise figure which depend on amplifier gain. A figure of merit representative of network section performance is computed based on linear and non-linear noise at current power levels of the amplifiers. The figure of merit is evaluated. The set of powers is applied to the amplifiers in the network section when evaluation of the figure of merit indicates that network performance improvement can be achieved.
    Type: Application
    Filed: July 9, 2013
    Publication date: January 15, 2015
    Inventors: Stefano Piciaccia, Rosanna Pastorelli, Mauro Brunella
  • Patent number: 8923694
    Abstract: An optical receiving device includes: an optical amplifier configured to amplify a wavelength multiplexed optical signal; a demultiplexer configured to demultiplex the amplified wavelength multiplexed signal into optical signals of a plurality of wavelengths; optical receivers configured to regenerate the demultiplexed optical signals; error correction units configured to correct a bit error in the regenerated optical signals; and main control unit. The control unit adjusts RXDTV of the optical receiver for receiving optical signals of a given wavelength to the optimal value in the state where the gain of the optical amplifier is lowered from that of a normal operation such that the occurrence of bit errors in the optical signals of the other wavelengths does not exceed the correction capability of the error correction unit.
    Type: Grant
    Filed: February 4, 2013
    Date of Patent: December 30, 2014
    Assignees: Fujitsu Telecom Networks Limited, Fujitsu Limited
    Inventors: Toshiki Honda, Takehiro Fujita, Yasushi Sugaya
  • Patent number: 8903094
    Abstract: The invention concerns a cryptographic key distribution system comprising a server node, a repeater network connected to the server node through a quantum channel, and a client node connected to the repeater network through a quantum channel; wherein in use: the repeater network and the client node cooperatively generate a transfer quantum key which is supplied to a system subscriber by the client node; the server node and the repeater network cooperatively generate a link quantum key; the repeater network encrypts the link quantum key based on the transfer quantum key and sends the encrypted link quantum key to the system subscriber through a public communication channel; the server node encrypts a traffic cryptographic key based on the link quantum key and a service authentication key and sends the encrypted traffic cryptographic key to the system subscriber through a public communication channel.
    Type: Grant
    Filed: August 3, 2012
    Date of Patent: December 2, 2014
    Assignee: Selex Sistemi Integrati S.p.A.
    Inventor: Fabio Antonio Bovino
  • Patent number: 8897639
    Abstract: Systems and methods according to these exemplary embodiments provide for methods and systems that allow for either reducing signal loss or improving the optical signal strength in a PON for increasing optical signal range.
    Type: Grant
    Filed: November 27, 2007
    Date of Patent: November 25, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Elmar Trojer, Stefan Dahlfort
  • Publication number: 20140341569
    Abstract: An integrated mobile communication repeater monitoring device, and method and system for mobile communication relay and information provision, is provided. Signals received from communication networks are divided into signals of mobile communication channels and signals of data channels, mobile communication services are provided to on the basis of the signals of the mobile communication channels, and data is displayed on the basis of the signals of the data channels.
    Type: Application
    Filed: April 4, 2012
    Publication date: November 20, 2014
    Applicant: KT CORPORATION
    Inventors: Jeong-Keun Choi, Jong-Ho Park
  • Patent number: 8867914
    Abstract: A method of operating a production optical amplifier comprises determining a training data set of amplified spontaneous emission (ASE) values of a training optical amplifier over a plurality of training operating conditions, determining a production data set of ASE values of the production optical amplifier over a plurality of production operating conditions, the plurality of production operating conditions corresponding to a sub-set of the plurality of training operating conditions, determining an adjusted data set of adjusted ASE values produced by extrapolation from the production data set so that the adjusted data set is provided over a plurality of operating conditions corresponding to the plurality of training operating conditions, determining, for each of a plurality of operating conditions, a dynamic ASE tilt factor from the training data set and the adjusted ASE data set so determined, determining a larger data set of ASE values over a wider set of operating conditions than either the training data s
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: October 21, 2014
    Assignee: II-VI Incorporated
    Inventors: Ian McClean, Paul Johnson, Stephen Fourte
  • Patent number: 8867923
    Abstract: A transponder for performing bidirectional conversion between a client-side signal used for communication to a client device and a transmission path-side signal used for communication to a transmission path, the transponder comprising: a client-side interface for inputting/outputting the client-side signal; a transmission path-side interface for inputting/outputting the transmission path-side signal; a connection determining unit for determining which of the another client-side interface and the client device is coupled to the client-side interface; and a transmission signal generating unit for outputting, in a case where a state signal indicating a state on a transmission path side is input to the transmission path-side interface, a transmission signal indicating that the state signal has been input, from the client-side interface, wherein: the transmission signal generating unit changes a form of the transmission signal to be output from the client-side interface, based on a determination result obtained by
    Type: Grant
    Filed: April 27, 2012
    Date of Patent: October 21, 2014
    Assignee: Hitachi, Ltd.
    Inventor: Kenta Noda
  • Patent number: 8798464
    Abstract: A method of determining a power correction factor for an optical power of an optical channel of a wavelength division multiplexed communications network. The method comprises configuring an optical source of the communications network to generate an unmodulated optical carrier signal for the optical channel. The method further comprises determining the optical power of the unmodulated optical carrier signal (PHIGH). The method further comprises configuring the optical source to apply a test modulation pattern to the optical carrier signal, to generate a modulated optical carrier signal. The method further comprises determining the optical power of the modulated optical carrier signal (PMOD). The method further comprises determining a power correction factor for the optical channel by determining the difference between the optical powers of the unmodulated optical carrier signal and the modulated optical carrier signal.
    Type: Grant
    Filed: March 19, 2009
    Date of Patent: August 5, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Gianmarco Bruno, Riccardo Ceccatelli, Edoardo Mongiardini
  • Patent number: 8792784
    Abstract: An optical communication system comprising an optical fiber connected to a first signal regeneration node located at a first end of the optical fiber and a second signal regeneration node located at a second end of the optical fiber; intermediary nodes located between the first and second signal regeneration nodes, wherein one or more pairs of adjacent intermediary nodes each define a span distance along the optical fiber; and one or more Raman amplifiers located within each span distance along the optical fiber, wherein at least one of the one or more Raman amplifiers comprises a case that encases one or more lasers and a temperature controller comprising a temperature sensor to monitor a temperature of the one or more lasers; and a temperature regulator to control a temperature of the one or more lasers.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: July 29, 2014
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Glenn A. Wellbrock, Tiejun J. Xia
  • Patent number: 8792785
    Abstract: A circuit for monitoring an optical receiver or transceiver, architectures, circuits, and systems including the same, and a method for monitoring received optical power are disclosed. The receiver monitoring circuit comprises an avalanche photodiode (APD), a microprocessor, and first and second transresistance amplifiers. The microprocessor is configured to supply bias voltage to the APD. Photocurrent produced by the APD is supplied to the first and second transresistance amplifiers, and then the microprocessor captures optical power from the voltage signal of the first and second transresistance amplifiers.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: July 29, 2014
    Assignee: Source Photonics, Inc.
    Inventors: Xu Jiang, Xin Shuai, Bing Ju, Yi Yang
  • Patent number: 8712237
    Abstract: Signals propagating in wavelength division multiplexing (WDM) optical networks suffer from loss, which decreases optical signal-to-noise ratios (OSNRs) and degrades a quality of received transmissions. Present methods of boosting OSNRs involve regeneration using transponders, which scale in complexity with the number of WDM channels. Optical amplifiers may boost signal strength, but amplified spontaneous emission (ASE) noise often reduces OSNR despite increases in signal strength, although changing the amplifier operating settings may reduce emitted ASE noise power. A method or corresponding apparatus in an example embodiment of the present invention provides a planning tool for deploying optical amplifiers in an optical network in a manner that reduces the need for optical regeneration, reducing cost and complexity of the deployed network.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: April 29, 2014
    Assignee: Tellabs Operations, Inc.
    Inventors: David W. Jenkins, Ramasubramanian Anand, Hector Ayala, Julia Y. Larikova, Kenneth M. Fisher
  • Patent number: 8705978
    Abstract: An apparatus comprising one or more optical amplifiers coupled to an optical link and configured to amplify a plurality of Wavelength Division Multiplexing (WDM) channels that are transmitted at a plurality of wavelengths on the optical link, and a processor coupled to the optical link and configured to add, delete, or both a plurality of WDM channels in the optical link based on an allowed power ratio indication for the WDM channels, wherein the allowed power ratio indication is calculated based on a plurality of gain change representations for the WDM channels at a plurality of power ratios and on a link budget requirement for the optical link.
    Type: Grant
    Filed: June 20, 2011
    Date of Patent: April 22, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventors: Zhiping Jiang, Jian Zhong
  • Patent number: 8676053
    Abstract: The present invention relates to communications technologies, and discloses a method for monitoring the state of a fiber line, a repeater, and a submarine cable system. The repeater includes a first optical amplifier (OA), a second optical amplifier, a first gating unit, a second gating unit, a first coupler, a second coupler, a third coupler, and a fourth coupler. The first coupler, the fourth coupler, and the first gating unit form an in-to-in loopback path between the input end of the first OA and the input end of the second OA; and the second coupler, the third coupler, and the second gating unit form an out-to-out loopback path between the output end of the first OA and the output end of the second OA.
    Type: Grant
    Filed: December 19, 2011
    Date of Patent: March 18, 2014
    Assignee: Huawei Marine Networks Co., Ltd.
    Inventors: Guozhong Wang, Dan Su, Bin Li, Guoyao Zhou
  • Patent number: 8630550
    Abstract: Disclosed is an optical amplifier which includes an upward optical amplifier configured to amplify an input upward optical signal of an input optical signal; and a control circuit configured to control an operation of the upward optical amplifier according to whether an upward stream is detected from the input upward optical signal.
    Type: Grant
    Filed: August 30, 2011
    Date of Patent: January 14, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Mun Seob Lee, Jong Deog Kim, Dongsoo Lee, Sung Chang Kim, Hark Yoo, Geun Yong Kim, Youngsuk Lee, Sim-Kwon Yoon
  • Patent number: 8615172
    Abstract: A method for arranging relay stations in an optical transmission system including relay stations arranged so that optical signals at a first transmission speed can be transmitted from a transmission end to a reception end, includes: judging whether a transmission of optical signals at a second transmission speed different from the first transmission speed in a section connecting arbitrary two of the relay stations where a regenerative repeater station capable of regenerating optical signals can be arranged is possible; determining a combination of sections judged to be capable of performing transmission that enables a transmission of optical signals from the transmission end to the reception end; and making both ends of respective sections of the determined combination be the relay stations where the regenerative repeater station is arranged, wherein the judging includes a judgment condition which is satisfied in a section including sections but unsatisfied in one of the sections.
    Type: Grant
    Filed: August 9, 2011
    Date of Patent: December 24, 2013
    Assignee: Fujitsu Limited
    Inventor: Takuya Miyashita
  • Publication number: 20130322875
    Abstract: An optical transmission device according to the present invention comprises: a Raman amplification means; a main signal light sending means which sends first main signal light; a communication interruption detection light monitoring means which sends a first signal if it cannot detect communication interruption detection light; a main signal light monitoring means which sends a second signal if it cannot detect second main signal light; a light monitoring signal analysis means which sends a result of its analysis of a light monitoring signal as a third signal in a predetermined period of time; and a control means which makes the Raman amplification means suspend the generation of the excitation light, if it cannot receive the third signal even after the elapse of the predetermined period of time in the state it has received the first signal and has not received the second signal, and stops sending of the first main signal light from the main signal light sending means when receiving the second signal further.
    Type: Application
    Filed: January 20, 2012
    Publication date: December 5, 2013
    Applicant: NEC CORPORATION
    Inventor: Noboru Iijima
  • Patent number: 8594500
    Abstract: A method includes outputting an optical signal from an optical transmitter; causing the optical signal to propagate through equipment of an optical communication site and to loop back to an optical receiver; measuring optical powers, respectively, based on taps proximate to the optical transmitter and the optical receiver; calculating an optical power loss based on the optical powers measured; determining whether the optical power loss is an acceptable value; and indicating when the optical power loss is not the acceptable value.
    Type: Grant
    Filed: November 23, 2009
    Date of Patent: November 26, 2013
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Tiejun J. Xia, Glenn A. Wellbrock, Danny Peterson
  • Patent number: 8582985
    Abstract: An optical receiver is described. This optical receiver has two operating modes: a calibration mode and a normal mode. During the normal mode, switches are used to electrically couple an input of a transimpedance amplifier (TIA) to an optical-to-electrical (OE) converter that receives an optical signal and provides a corresponding analog electrical signal. Moreover, during the calibration mode, the switches are used to electrically isolate the input of the TIA from the OE converter while maintaining a feedback path from an output of the TIA to the input of the TIA, thereby ensuring proper bias of the TIA during calibration. Furthermore, a frequency response of the TIA during the normal mode is substantially unchanged over an operating bandwidth of the TIA by the capability to electrically isolate the input of the TIA from the OE converter during the calibration mode.
    Type: Grant
    Filed: June 9, 2011
    Date of Patent: November 12, 2013
    Assignee: Oracle International Corporation
    Inventors: Frankie Y. Liu, Dinesh D. Patil
  • Publication number: 20130279905
    Abstract: A noise discriminator circuit and a noise discrimination method in a burst mode receiver is configured to determine the validity of an incoming burst signal by analyzing the timing of the signal edges of incoming signal to look for a time duration conforming to the preamble data bits of a valid burst signal. In one embodiment, the noise discriminator circuit and method analyze the time duration between signal edges of the same pulse of an incoming signal. In another embodiment, the noise discriminator circuit and method analyze the time duration between a first set of pulses of an incoming signal and the time duration between signal edges of a second set of pulses of the incoming signal. When the time durations are within a given time range relating to a predetermined timing separation of a valid burst signal, the incoming signal is validated as a valid burst signal.
    Type: Application
    Filed: August 16, 2012
    Publication date: October 24, 2013
    Applicant: MICREL, INC.
    Inventors: George W. Brown, Thomas S. Wong, Bernd Neumann
  • Patent number: 8554071
    Abstract: An optical transmission apparatus includes an amplifier, a first output port to select a wavelength from the wavelength-division-multiplexed signal light amplified and output signal light with the selected wavelength to an operation line, a second output port to output multiplexed light obtained by multiplexing any one of first spontaneous emission light and second spontaneous emission light to a preliminary line, the first and the second spontaneous emission light being parts of spontaneous emission light generated by the amplifier, the first spontaneous emission light being in a wavelength range that is not selected, and the second spontaneous emission light being in a wavelength range other than a range of the wavelength-division-multiplexed signal light, and a judger to judge a continuity state of the operation line by using the signal light output to the operation line and a continuity state of the preliminary line.
    Type: Grant
    Filed: January 21, 2011
    Date of Patent: October 8, 2013
    Assignee: Fujitsu Limited
    Inventors: Takuma Shoji, Ichiro Nakajima
  • Patent number: 8542993
    Abstract: An apparatus comprising an individual optical power level calculation (IOPLC) module and a transceiver coupled to the IOPLC module and configured to communicate with a plurality of optical network units (ONUs). Also disclosed is an apparatus comprising a control and management (CM) module, an average power level measurement (APLM) module coupled to the CM module, a first transceiver coupled to the CM module and configured to communicate with an optical line terminal (OLT), and a second transceiver coupled to the CM module and the APLM module, and configured to communicate with a plurality of ONUs.
    Type: Grant
    Filed: April 30, 2012
    Date of Patent: September 24, 2013
    Assignee: Futurewei Technologies, Inc.
    Inventors: Frank J. Effenberger, Yin Jinrong, Yang Sulin
  • Patent number: 8526826
    Abstract: A repeater (1) includes a master unit (2) for communicating with a base station of a mobile network, a plurality of remote units (3) for communicating with mobile communications terminals, and a common optical waveguide (4) connecting the remote units (3) with the master unit (2) for transmitting the optical signals from each of the remote units (3) to the master unit (2). The remote units (3) include, as a transmitter for the optical signals, a laser (7) of a construction similar or somewhat identical to that of the other lasers (7). The lasers (7) have similar or somewhat identical nominal wavelengths (?N), and the individual lasers (7) are selected by adjusting their operating temperatures (TD1-TD4) in such a way that each laser transmits on a different transmission wavelength (?ü1-?ü4).
    Type: Grant
    Filed: March 5, 2009
    Date of Patent: September 3, 2013
    Assignee: Andrew LLC
    Inventors: Stefan Eisenwinter, Peter Schmid
  • Patent number: 8526812
    Abstract: The path selection and wavelength assignment to a selected path are performed by mapping the wavelength reach to the demand distribution (agile reach) resulting in a 50-60% increase in the network reach. The network reach is further increased (about 2.2 times) when on-line measured performance data are used for path selection and wavelength assignment. The connections may be engineered/upgraded individually, by optimizing the parameters of the entire path or of a regenerator section of the respective path. The upgrades include changing the wavelength, adjusting the parameters of the regenerator section, controlling the launch powers, mapping a certain transmitter and/or receiver to the respective wavelength, selecting the wavelengths on a certain link so as to reduce cross-talk, increasing wavelength spacing, etc.
    Type: Grant
    Filed: June 8, 2012
    Date of Patent: September 3, 2013
    Assignee: Alcatel Lucent
    Inventors: Alan Glen Solheim, Peter David Roorda, Kevan Peter Jones, Greg Peter Friesen
  • Patent number: 8437642
    Abstract: A method and apparatus are provided for attenuating an optical beam. The method includes selecting a level of attenuation to be applied to the optical beam. A pattern of on-state and off-state pixels in a two dimensional spatial light modulator (SLM) is selected such that the pattern will modulate the optical beam to provide the selected level of attenuation. Finally, the optical beam is directed onto the SLM while tile pixels are arranged in the selected pattern. The pattern is periodic along a first axis and symmetric along a second axis along which an intensity distribution of die optical beam extends.
    Type: Grant
    Filed: August 15, 2008
    Date of Patent: May 7, 2013
    Assignee: Nistica, Inc.
    Inventors: Jefferson L. Wagener, Thomas Andrew Strasser
  • Patent number: 8433190
    Abstract: An amplifier node, in an optical network, includes a first switch connected to a working path from which network traffic is received; a second switch connected to the working path to which the network traffic is transmitted; and two amplifiers that interconnect the first switch and the second switch, where the network traffic travels from the first switch to the second switch via a first amplifier. The amplifier node also includes a controller to receive an instruction to switch the network traffic from the first amplifier to a second amplifier that enables the first amplifier to be repaired; send, to the first switch and the second switch, another instruction to switch the network traffic from the first amplifier to the second amplifier; receive an indication that the network traffic is traveling via the second amplifier; and send a notification that the first amplifier can be repaired based on the indication.
    Type: Grant
    Filed: August 9, 2010
    Date of Patent: April 30, 2013
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Glenn A. Wellbrock, Tiejun J. Xia
  • Patent number: 8422121
    Abstract: An optical transmission node including an optical preamplifier to amplify input light and an optical postamplifier to amplify light output from the optical preamplifier, includes the optical postamplifier configured to generate amplified spontaneous emission light without signals input, the optical preamplifier configured to amplify the amplified spontaneous emission light from the optical postamplifier, a loopback switch configured to discouple a path of the light output from the optical preamplifier to the optical postamplifier, and couple a path of the light output from the optical postamplifier to the optical preamplifier.
    Type: Grant
    Filed: June 15, 2010
    Date of Patent: April 16, 2013
    Assignee: Fujitsu Limited
    Inventors: Hiroyuki Itoh, Takuji Maeda
  • Patent number: 8417115
    Abstract: In one example embodiment, an optoelectronic module includes an optical receiver and a post-amplifier. The optical receiver is configured to receive an optical signal and generate an electrical data signal corresponding to the optical signal. The post-amplifier is electrically connected to the optical receiver and is configured to amplify the electrical data signal. The optoelectronic module further includes means for quantifying a quality of the optical signal from which the amplified electrical data signal is derived.
    Type: Grant
    Filed: July 7, 2010
    Date of Patent: April 9, 2013
    Assignee: Finisar Corporation
    Inventor: The′ Linh Nguyen
  • Patent number: 8396359
    Abstract: A method for engineering of a connection in a WDM photonic network with a plurality of flexibility sites connected by links comprises calculating a physical end-to-end route between a source node and a destination node and setting-up a communication path along this end-to-end route. An operational parameter of the communication path is continuously tested and compared with a test threshold. The path is declared established whenever the operational parameter is above the margin tolerance. The established path is continuously monitored by comparing the operational parameter with a maintenance threshold. A regenerator is switched into the path whenever the operational parameter is under the respective threshold, or another path is assigned to the respective connection. An adaptive channel power turn-on procedure provides for increasing gradually the power level of the transmitters in the path while measuring an error quantifier at the destination receiver until a preset error quantifier value is reached.
    Type: Grant
    Filed: March 8, 2011
    Date of Patent: March 12, 2013
    Assignee: Alcatel Lucent
    Inventors: Jingyu Zhou, Alan Glen Solheim, Robert Au-Yang, Mark Stephen Wight, Christian Scheerer
  • Publication number: 20130058646
    Abstract: A method of operating a production optical amplifier comprises determining a training data set of amplified spontaneous emission (ASE) values of a training optical amplifier over a plurality of training operating conditions, determining a production data set of ASE values of the production optical amplifier over a plurality of production operating conditions, the plurality of production operating conditions corresponding to a sub-set of the plurality of training operating conditions, determining an adjusted data set of adjusted ASE values produced by extrapolation from the production data set so that the adjusted data set is provided over a plurality of operating conditions corresponding to the plurality of training operating conditions, determining, for each of a plurality of operating conditions, a dynamic ASE tilt factor from the training data set and the adjusted ASE data set so determined, determining a larger data set of ASE values over a wider set of operating conditions than either the training data s
    Type: Application
    Filed: March 21, 2011
    Publication date: March 7, 2013
    Inventors: Ian McClean, Paul Johnson, Stephen Fourte
  • Publication number: 20130028599
    Abstract: There is provided a repeater to relay an optical signal transmitted/received between an optical line terminal (OLT) and at least one optical network unit (ONU), the repeater including: a first port configured to receive an optical signal input from the at least one ONU; a converter circuit configured to convert an optical signal of a first transmission rate into an optical signal of a second transmission rate higher than the first transmission rate, the optical signal of the first transmission rate to be converted being included in optical signals received at the first port; and a second port configured to output the optical signal converted by the converter circuit to the OLT.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 31, 2013
    Applicant: FUJITSU LIMITED
    Inventors: Kyosuke SONE, George Ishikawa, Susumu Kinoshita
  • Patent number: 8355631
    Abstract: A system for transmitting a plurality of data channels and an optical service channel through an optical fiber link of a Wavelength Division Multiplexed (WDM) optical communications system. The system comprises a first transmitter at a first end of the optical fiber link, for transmitting the data channels as a wavelength division multiplexed optical signal through the optical fiber link in a first direction. A second transmitter is connected at a second end of the optical fiber link, for transmitting the optical service channel through the optical fiber link in a second direction opposite to the first direction.
    Type: Grant
    Filed: January 29, 2010
    Date of Patent: January 15, 2013
    Assignee: Ciena Corporation
    Inventors: Maurice O'Sullivan, Jamie Gaudette, Roger Carroll
  • Patent number: 8351797
    Abstract: A repeater is disclosed that transmits an optical signal using wave division multiplexing. The repeater includes a demultiplexing unit that separates plural channels contained in the optical signal, an adjusting unit that adjusts at least optical power of each of the channels according to a control signal, a multiplexing unit that outputs a multiple wavelength signal in which the channels are multiplexed, and a monitoring unit that determines a modulation scheme and a bit rate of the optical signal for each of the channels so as to generate the control signal.
    Type: Grant
    Filed: January 27, 2010
    Date of Patent: January 8, 2013
    Assignee: Fujitsu Limited
    Inventors: Hisao Nakashima, Takeshi Hoshida
  • Patent number: 8331778
    Abstract: A WDM transmission apparatus to receive or relay WDM light in a WDM transmission system, includes a measuring unit configured to measure an optical level of each channel transmitted by the WDM light; an adjusting unit configured to adjust a resolution of the measuring unit; and a processing unit configured to obtain, for each channel, optical level information which represents an optical level respectively measured with a resolution corresponding to a bit rate of a transmission signal of each channel.
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: December 11, 2012
    Assignee: Fujitsu Limited
    Inventor: Yoshihiro Shimizu
  • Patent number: 8275269
    Abstract: The distributed Raman amplifier monitors an OSNR of each channel in a WDM light which has been propagated through a transmission path to be Raman amplified, and thereafter, is amplified by an optical amplifier in an optical repeating node; judges whether a monitor value of the OSNR is larger or smaller than a previously set target value thereof; and feedback controls a driving state of a pumping light source which supplies a Raman pumping light to the transmission path, based on the judgment result. The optical communication system comprises the above distributed Raman amplifier in each repeating span thereof, and performs a pumping light control of the distributed Raman amplifier corresponding to the repeating span selected based on the OSNR in each distributed Raman amplifier and the monitor result of span loss. As a result, it becomes possible to effectively improve the OSNR of each channel in the WDM light, and also, to reduce the power consumption.
    Type: Grant
    Filed: November 12, 2009
    Date of Patent: September 25, 2012
    Assignee: Fujitsu Limited
    Inventor: Miki Onaka
  • Publication number: 20120237215
    Abstract: An optical communication system comprising an optical fiber connected to a first signal regeneration node located at a first end of the optical fiber and a second signal regeneration node located at a second end of the optical fiber; intermediary nodes located between the first and second signal regeneration nodes, wherein one or more pairs of adjacent intermediary nodes each define a span distance along the optical fiber; and one or more Raman amplifiers located within each span distance along the optical fiber, wherein at least one of the one or more Raman amplifiers comprises a case that encases one or more lasers and a temperature controller comprising a temperature sensor to monitor a temperature of the one or more lasers; and a temperature regulator to control a temperature of the one or more lasers.
    Type: Application
    Filed: March 15, 2011
    Publication date: September 20, 2012
    Applicant: VERIZON PATENT AND LICENSING INC.
    Inventors: Glenn A. Wellbrock, Tiejun J. Xia
  • Patent number: 8265481
    Abstract: The path selection and wavelength assignment to a selected path are performed by mapping the wavelength reach to the demand distribution (agile reach) resulting in a 50-60% increase in the network reach. The network reach is further increased (about 2.2 times) when on-line measured performance data are used for path selection and wavelength assignment. The connections may be engineered/upgraded individually, by optimizing the parameters of the entire path or of a regenerator section of the respective path. The upgrades include changing the wavelength, adjusting the parameters of the regenerator section, controlling the launch powers, mapping a certain transmitter and/or receiver to the respective wavelength, selecting the wavelengths on a certain link so as to reduce cross-talk, increasing wavelength spacing, etc.
    Type: Grant
    Filed: March 10, 2011
    Date of Patent: September 11, 2012
    Assignee: Alcatel Lucent
    Inventors: Alan Glen Solheim, Peter David Roorda, Kevan Peter Jones, Greg Peter Friesen