Bit Error Rate Patents (Class 398/27)
  • Patent number: 10236975
    Abstract: The present disclosure provides a programmable integrated circuit die for optical testing. The integrated circuit die includes both photonic and electronic elements. In particular, the integrated circuit die may include a memory block, a programmable logic block (for example, a field programmable gate array), an electrical transceiver block, an optical transceiver block, and an optical test interface unit. The programmable logic block may be programmed to have logic functionalities of an embedded microcontroller and of various encoders/decoders. The logic functions may be soft, hard, or mixed. The memory may be used to store test patterns, look-up tables, measured waveforms, error time profiles and statistics. The electrical and optical transceivers may implement PAMn, NRZ, or QAMn modulations and may have programmable parameters, including: voltage levels; optical power; slew rate; magnitude/phase; clock generation and recovery; equalizations; sampling levels; and sampling times.
    Type: Grant
    Filed: February 10, 2017
    Date of Patent: March 19, 2019
    Assignee: Intel Corporation
    Inventor: Peng Li
  • Patent number: 10225011
    Abstract: The disclosure provides for a system that includes a plurality of stations equipped for free-space optical communications (FSOC) in a network and a central control system. At least one station in the plurality of stations includes a wavelength selectable switch, an OEO module, and one or more first processors. The one or more first processors are configured to control the wavelength selectable switch, process an electrical signal that is extracted using the OEO module, and communicate with the central control system. The central control system includes one or more second processors that are configured to receive data regarding FSOC communication conditions at the plurality of stations, determine a path between stations through the network based on the received data, and transmit instructions to the plurality of stations.
    Type: Grant
    Filed: July 12, 2017
    Date of Patent: March 5, 2019
    Assignee: X Development LLC
    Inventors: Martin Schubert, Sylvia Smullin, Edward Keyes
  • Patent number: 10200131
    Abstract: A method of operating a BPSK modulator includes receiving an RF signal at the BPSK modulator and splitting the RF signal into a first portion and a second portion that is inverted with respect to the first portion. The method also includes receiving the first portion at a first arm of the BPSK modulator, receiving the second portion at a second arm of the BPSK modulator, applying a first tone to the first arm of the BPSK modulator, and applying a second tone to the second arm of the BPSK modulator. The method further includes measuring a power associated with an output of the BPSK modulator and adjusting a phase applied to at least one of the first arm of the BPSK modulator or the second arm of the BPSK modulator in response to the measured power.
    Type: Grant
    Filed: April 6, 2018
    Date of Patent: February 5, 2019
    Assignee: Skorpios Technologies, Inc.
    Inventors: Stephen B. Krasulick, Timothy Creazzo, Kalpit Jha, Elton Marchena, Amit Mizrahi
  • Patent number: 9913157
    Abstract: Aspects of the present disclosure generally relate to wireless communications. In some aspects, a device may receive information identifying a plurality of measurements of a communication metric related to a network at a plurality of time intervals. The device may determine a plurality of colors corresponding to a plurality of values of the communication metric. The plurality of values may correspond to the plurality of measurements of the communication metric at the plurality of time intervals. The device may combine the plurality of colors to generate a composite color for the communication metric.
    Type: Grant
    Filed: September 7, 2016
    Date of Patent: March 6, 2018
    Assignee: QUALCOMM Incorporated
    Inventors: Diego Calzolari, Chintan Pravin Turakhia
  • Patent number: 9906296
    Abstract: A network controller includes: a first acquisition unit configured to acquire, based on a signal quality amount of each of wavelength paths set in a network of an optical wavelength-multiplexed transmission system, a signal quality amount of each of spans in each of the wavelength paths; an arithmetic unit configured to calculate a signal quality amount of each of spans in a wavelength path of an estimation target, based on the signal quality amount acquired by the first acquisition unit; and an estimation unit configured to estimate a signal quality amount of the wavelength path of the estimation target, based on the signal quality amount calculated by the arithmetic unit.
    Type: Grant
    Filed: June 3, 2016
    Date of Patent: February 27, 2018
    Assignee: FUJITSU LIMITED
    Inventors: Shoichiro Oda, Yasuhiko Aoki, Takeshi Hoshida, Hisao Nakashima, Hiroki Oi
  • Patent number: 9562986
    Abstract: The present application is a detection system for locating and characterizing an object placed in a detection area in a three dimensional space. The detection system includes a plurality of magnetic field generators and magnetic field detectors arranged on opposite sides of the detection area and a control system for enabling generation of a magnetic field in the detection area by the magnetic field generators and for measuring of the magnetic field modified by the object at each of the magnetic field detectors. The detection system also includes a processor for processing the measured magnetic field to obtain a data set characterizing the object and a location of the object. The processor applies a reconstruction process on a predefined number of measurements of the modified magnetic field.
    Type: Grant
    Filed: July 1, 2011
    Date of Patent: February 7, 2017
    Assignee: Rapiscan Systems, Inc.
    Inventors: Anthony J. Peyton, David W. Armitage, Liam A. Marsh, Christos Ktistis, William Robert Breckon Lionheart, Ari Järvi
  • Patent number: 9520953
    Abstract: Method and sensor system for measuring the transmission properties of a first transmission path based on feedback compensation between a first transmitter and a receiver, a compensation signal of a compensation transmitter being received in a superimposed manner in the receiver in addition to the emitted transmission signal of the first transmitter. A supply signal for the first transmitter and a receiver output signal each form a vector in a pre-Hilbert space. A Hilbert projection is performed between the receiver output signal and the supply signal so that a projection image signal is generated. An output signal is formed from the projection image signal. A pre-signal is generated by an inverse transformation of the output signal with the supply signal. A compensation signal for supplying the compensation transmitter is generated from the pre-signal formed in order to achieve feedback control of the receiver output signal.
    Type: Grant
    Filed: August 22, 2014
    Date of Patent: December 13, 2016
    Assignee: Elmos Semiconductor AG
    Inventor: Bernd Burchard
  • Patent number: 9419741
    Abstract: An optical transmission system includes: a plurality of optical transmission devices each including: an adjustment unit to adjust optical power of channels in the WDM optical signal; and a controller to control the adjustment unit based on an adjustment amount, and a management device including: a converter to convert an evaluation value for evaluating quality of service provided by using the channels in the WDM optical signal into a threshold value of transmission quality to be satisfied by the channels; and a determination unit to calculate the transmission quality of the channels based on monitoring information of the channels in the WDM optical signal adjusted by the adjusting unit of at least one of the plurality of optical transmission devices and to determine the adjustment amount to be set for the optical transmission device so that the calculated transmission quality of the channels satisfy the threshold value.
    Type: Grant
    Filed: June 25, 2014
    Date of Patent: August 16, 2016
    Assignee: FUJITSU LIMITED
    Inventors: Taizo Maeda, Takuya Miyashita
  • Patent number: 9113362
    Abstract: Coverage and usage-based limitations to a wireless communications network can be estimated by monitoring network performance during a periods in which the network is relatively busy and relatively non-busy. For example, differences in distributions of bit error rates for calls in such time periods can be used to assess whether network limitations are associated with reduced-coverage zones or are usage-based. Such estimates can be used to target specific network features that limit network performance.
    Type: Grant
    Filed: December 12, 2006
    Date of Patent: August 18, 2015
    Assignee: AT&T Mobility II LLC
    Inventors: Ming Zhang, Gaviphat Lekutai, Donald C. Hjort
  • Patent number: 9081677
    Abstract: An input bit error ratio estimating method executed by a communication control unit includes a computing, a condition determining, a first input BER estimating, a second input BER estimating, a third input BER estimating, and an input BER estimation result outputting. In the condition determining, the communication control unit determines which of a plurality of conditions set in advance to be narrowed down to one has been established, based on a post-internal decoding residual error detection ratio. Based on the condition that is determined in the condition determining as one that has been established, the communication control unit selects one out of a plurality of processing procedures for estimating the input BER, namely, selects one of the first input BER estimating to the third input BER estimating and executes the selected processing.
    Type: Grant
    Filed: February 20, 2012
    Date of Patent: July 14, 2015
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Yoshikuni Miyata, Kenya Sugihara, Kiyoshi Onohara, Kazuo Kubo, Hideo Yoshida, Takashi Mizuochi
  • Patent number: 9077479
    Abstract: An approach is provided for adjusting network interface metrics to optimize transmissions across a network. A measurement of performance of a network interface is made, wherein the network interface is configured to provide traffic across an optical network. A determination is made regarding whether the measured performance satisfies a predetermined threshold. A network metric value of the network interface is adjusted if the measured performance of the network interface satisfies the predetermined threshold.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: July 7, 2015
    Assignee: VERIZON PATENT AND LICENSING INC.
    Inventors: Scott R. Kotrla, Christopher N. DelRegno, Matthew W. Turlington, Michael U. Bencheck, Richard C. Schell
  • Patent number: 9042724
    Abstract: A WDM optical signal is transmitted through a tunable optical filter and is polarization-nulled to find optical signal to noise ratio of individual WDM channels. The polarization nulling can be performed using a heuristic multipoint extrema search method, such as Nelder-Mead method. A plurality of checkpoints can be included in the search to verify the progress and to improve the overall robustness of a real-time polarization nulling.
    Type: Grant
    Filed: December 2, 2013
    Date of Patent: May 26, 2015
    Assignee: JDSU Deutschland GmbH
    Inventor: Axel Flettner
  • Publication number: 20150139639
    Abstract: A scheme is described of remote control of the slicing level of a receiver in a smart SFP (or SFP+, or XFP) duplex (or BiDi, or SWBiDi) transceiver in a communication system using an operating system with OAM and PP functions, an OAM, PP & Payload Processor, a transceiver, a BERT, and an optical link in the field.
    Type: Application
    Filed: December 8, 2014
    Publication date: May 21, 2015
    Inventors: Kwang Soo PARK, Moon Soo PARK
  • Patent number: 9008505
    Abstract: The present invention provides optical power adjustment method for EPON system, and OLT. The method comprises: OLT starting optical power adjustment procedure after ONU or ONT successfully registers, receiving upstream data from the ONU or the ONT (201); during optical power adjustment procedure, OLT detecting whether there is error code in upstream data; if not, notifying the ONU or the ONT to decrease transmission optical power progressively, during progressive decrease procedure, OLT continuing to detect whether there is error code in upstream data (203); if there is error code during progressive decrease procedure, notifying the ONU or the ONT to increase transmission optical power progressively, and during progressive increase procedure, OLT continuing to detect whether there is error code in upstream data (205); if there is no error code during progressive increase procedure, OLT stopping the adjustment (207).
    Type: Grant
    Filed: September 17, 2010
    Date of Patent: April 14, 2015
    Assignee: ZTE Corporation
    Inventor: Shundong Xia
  • Patent number: 9002200
    Abstract: An apparatus and method of pre-emphasising a launch power profile of a section in an optical network is provided. The method comprises measuring the output power at the output of the section, determining the predicted output power associated with a flat launch power profile using design characteristics of the section and determining the total power deviation between the measured output power and the predicted output power. Also, the method comprises determining the signal to noise ratio deviation and the nonlinear phase shift deviation as a function of the total power deviation, and pre-emphasising the launch power profile based on a function of the calculated signal to noise ratio deviations of each span and the calculated nonlinear phase shift deviations of each span, such that the sum of the nonlinear phase shift deviations and the sum of the signal to noise ratio deviations of each channel are reduced by an equal amount.
    Type: Grant
    Filed: November 18, 2011
    Date of Patent: April 7, 2015
    Assignee: Alcatel Lucent
    Inventor: Jean-Luc Auge
  • Patent number: 8989596
    Abstract: An optical communication system has a receiver that includes a plurality of photon counting sensors that each receive photons and generate pulses based on the received photons, and an electronic circuit that aggregates the number of pulses from the plurality of photon counting sensors into a merged pulse count. A demodulator samples the merged pulse count at predetermined time intervals to determine a number of photons received by the plurality of photon counting sensors during different sampling time intervals.
    Type: Grant
    Filed: November 29, 2012
    Date of Patent: March 24, 2015
    Assignee: Northrop Grumman Systems Corporation
    Inventor: Oliver W. Saunders
  • Patent number: 8948313
    Abstract: A method and apparatus for adjusting a symbol decision threshold at a receiver in a communication network enables the receiver to be adapted to more correctly receive symbols as transmitted by a transmitter. In one embodiment, a received bit imbalance is detected by a receiver prior to error correction and after error correction to determine whether an error component of the received signal contains larger numbers of ones or larger numbers of zeros. Where the transmitter scrambles the signal prior to transmission, the receiver will also scramble the signal after error correction and prior to counting the number of zeros or ones. Any imbalance between the number of transmitted and received ones or zeros is used as feedback to adjust threshold values used by detectors to fine tune the manner in which the receiver interprets incoming signals.
    Type: Grant
    Filed: January 20, 2010
    Date of Patent: February 3, 2015
    Assignees: LG-Erricsson Co., Ltd., Rockstar Consortium USLP
    Inventors: Jonathan Davey, Wang-Hsin Peng
  • Patent number: 8938164
    Abstract: A system includes two optical modules that perform auto-setting of the optical links between the optical modules. One optical module sends an optical signal with a test pattern to the other optical module. If the receiving module determines that the test pattern is successfully received, it sends a pass indication to the transmitting module, and the transmitting module can configure its driver path in accordance with a transmit current setting used to transmit the test pattern. If the test pattern is not successfully received, the receiving module sends a fail indication, and the transmitting module can increase the transmit current setting and resend the test pattern. When the system includes multiple optical channels, one channel can be tested while feedback is provided on another channel. The system can iterate through all optical channels until they are all configured.
    Type: Grant
    Filed: September 28, 2012
    Date of Patent: January 20, 2015
    Assignee: Intel Corporation
    Inventors: Miaobin Gao, Christine M. Krause, Hui-Chin Wu, Hengju Cheng
  • Patent number: 8929730
    Abstract: Changes in a signal are detected. The signal is repeatedly sampled in a synchronous manner during a predetermined interval to generate a captured eye diagram. At least one of a positive differential eye diagram or a negative differential eye diagram is generated from the captured eye diagram and a baseline eye diagram. The at least one positive or negative differential eye diagram is analyzed to determine whether a change in signal conditions is present.
    Type: Grant
    Filed: September 14, 2012
    Date of Patent: January 6, 2015
    Assignee: Telcordia Technologies, Inc.
    Inventors: Ronald A. Skoog, Marcus Pang, Paul Toliver
  • Patent number: 8923705
    Abstract: One embodiment is a Poisson-based communication system. The system includes a receiver that comprises a photodetector that receives photons and generates pulses based on the received photons, a sampling event counter that counts the number of generated pulses by the photodetector and a demodulator. The demodulator samples the sampling event counter at predetermined time intervals to determine an occurrence of a first state when light pulse energy has been transmitted by a transmitter and received by the photodetector and an occurrence of a second state when light pulse energy has not been transmitted by the transmitter and received by the photodetector.
    Type: Grant
    Filed: March 6, 2012
    Date of Patent: December 30, 2014
    Assignee: Northrop Grumman Systems Corporation
    Inventors: Oliver W Saunders, Russell Kadota
  • 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: 8917988
    Abstract: A system to provide carrier frequency control in an optical network includes a first network element monitoring performance information and a second network element coupled to the first network element by the optical network. The second network element receives performance information from the first network element using an administration channel bandwidth, and modifies a carrier frequency associated with the second network element based on the performance information such that the carrier frequency is aligned to a center of a signal channel bandwidth. A method of providing carrier frequency control includes transmitting performance information by the first network element to the second network element using an administration channel bandwidth, and modifying the carrier frequency by the second network element based on the performance information such that the carrier frequency is aligned to the center of the signal channel bandwidth.
    Type: Grant
    Filed: December 7, 2012
    Date of Patent: December 23, 2014
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: Xiang Zhou
  • Publication number: 20140369680
    Abstract: A method of transmitting a data signal using an optical transmitter of an optical communications system. A first encoder processes an N-bit input vector in accordance with a first mapping to generate a corresponding M-bit data stream. A Forward Error Correction encoder processes the M-bit data stream in accordance with a predetermined FEC encoding scheme to generate an encoded signal. A constellation mapper maps the encoded signal to symbol values in accordance with a predetermined modulation scheme to generate a corresponding symbol stream. A modulator modulates a carrier light in accordance with the encoded symbol stream to generate an optical signal for transmission through the optical communications system. The first mapping can be adjusted to maximize performance of the optical communications system.
    Type: Application
    Filed: June 13, 2013
    Publication date: December 18, 2014
    Applicant: CIENA CORPORATION
    Inventors: Shahab OVEIS GHARAN, Kim B. ROBERTS, Akbar GHASEMI, Mahmoud TAHERZADEHBOROUJENI
  • Publication number: 20140369681
    Abstract: A manner of detecting the presence of alien devices, for example ONUs, that are transmitting upstream in an optical access network such as a PON. An alien detection device, for example a properly configured OLT, supports normal network operation and also monitors a selected performance characteristic. When the selected performance characteristic is evaluated to perform within satisfactory parameters, a protocol that includes a command to subscriber devices such as ONUs to go quiet, for example a rogue check, is executed and a signal detector monitored during the quiet period. An alarm may be generated if an alien device appears to be present.
    Type: Application
    Filed: April 25, 2014
    Publication date: December 18, 2014
    Applicant: ALCATEL-LUCENT USA INC.
    Inventors: Joseph L. Smith, Julia Ferguson
  • Publication number: 20140355979
    Abstract: In one embodiment, an optical directional coupler includes an input terminal configured to receive an input optical signal and a first coupler optically coupled to the input terminal, where the first coupler has a first coupling length, and where the first coupler is configured to couple a first portion of the input optical signal to a first optical leg and a second optical portion of the input optical signal to a second optical leg. The optical directional coupler also includes the first optical leg, where the first optical leg is configured to phase shift the first portion of the optical signal to produce a first phase shift signal and the second optical leg, where the second optical leg is configured to phase shift the second portion of the optical signal to produce a second phase shift signal, and where the first phase shift signal has a phase difference relative to the second phase shift signal.
    Type: Application
    Filed: May 30, 2014
    Publication date: December 4, 2014
    Inventors: Bryce Dorin, Winnie N. Ye
  • Patent number: 8903237
    Abstract: There is provided a method for determining a signal transfer characteristic along a light path between a first point and a second point in an optical network. The optical network comprises at least one optical element situated in the light path. The method comprises transmitting a plurality of optical test signals of different bandwidths from the first point along the light path. Each signal has a known bandwidth and a known power. The method further comprises receiving the optical test signals at the second point after they have travelled along the light path and measuring the power of each received optical test signal. The method also comprises determining the signal transfer characteristic along the light path from the power measurements.
    Type: Grant
    Filed: October 27, 2008
    Date of Patent: December 2, 2014
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Gianmarco Bruno
  • Publication number: 20140348500
    Abstract: An optical receiver includes a first discriminator in which an optimal point of a slice level is set and that compares a received signal to the slice level and discriminately outputs the received signal; a second discriminator that is connected in parallel to the first discriminator, compares the received signal to a slice level, and discriminately outputs the received signal; and a computing device that variably controls the slice level of the first and the second discriminators, respectively. The computing device executes a first process of setting the slice level of the first discriminator to be a predetermined slice level, calculating a pseudo error rate obtained when the slice level of the second discriminator is caused to variably scan, and setting the slice level of the first discriminator within a range in which the error rate does not vary.
    Type: Application
    Filed: April 22, 2014
    Publication date: November 27, 2014
    Applicant: Fujitsu Optical Components Limited
    Inventor: Toshio ISHII
  • Patent number: 8897638
    Abstract: An optical packet switching apparatus includes an optical packet switching apparatus, an optical transmitting apparatus, and an optical packet receiving apparatus. The optical packet transmitting apparatus includes a packet generator for generating a packet signal by adding the routing information to a received client signal, a BIP adding unit for adding BIP to the generated packet signal, and an electrical-to-optical converter for converting the packet signal, to which the BIP has been added, into an optical packet signal so as to be sent out. The optical packet receiving apparatus includes an electrical-to-optical converter for converting the received optical packet signal into an electrical packet signal, and a BIP comparison unit for detecting the error occurrence in the packet signal, based on the BIP added to the packet signal.
    Type: Grant
    Filed: April 24, 2012
    Date of Patent: November 25, 2014
    Assignee: Fujitsu Telecom Networks Limited
    Inventors: Koshi Kitajima, Satoshi Fukutomi, Wataru Kawasaki
  • Publication number: 20140334815
    Abstract: The invention proposes a system and method for selecting an optimal optical path through which to transmit an optical signal, the optimal optical path is one of a plurality of optical paths in a transparent optical network. Each of the plurality of optical paths includes a plurality of optical elements. For each of the plurality of optical paths, a first optical signal to noise ratio is determined for each optical element in the respective optical path. Then, for each of the plurality of optical paths, nonlinear distortions caused by each optical element in the respective optical path are modelled as Gaussian noise and a second optical signal to noise ratio associated with the modelled Gaussian noise is determined. Finally, the optimal optical path is selected using the sums of the first and second optical signal to noise ratios, respectively.
    Type: Application
    Filed: November 25, 2011
    Publication date: November 13, 2014
    Inventors: Edouard Grellier, Annalisa Morea, Alberto Bononi, Olivier Rival
  • Patent number: 8886035
    Abstract: Proposed is an efficient method of configuration of a transmitter and a receiver for realizing an optical transmission/reception module apparatus including at least one transmission wavelength and two or more reception wavelengths over a time division multiple access passive optical network or an optical network using multiple transmission/reception wavelengths. Further, proposed is a method of configuration of an apparatus which enables optical alignment and assembly in a single package by using a single lens and three different WDM optical filters for a reception module capable of receiving four wavelengths.
    Type: Grant
    Filed: August 21, 2012
    Date of Patent: November 11, 2014
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Jong Deog Kim, Jong Jin Lee
  • Patent number: 8879906
    Abstract: A method for optimal combined 2R/3R regenerators placement for optical transmission includes determining an optimal placement of multiple 2R and 3R regenerators that minimizes bit error rate BER at a destination node, determining an optimal number of the 2R and 3R regenerators that minimizes a total cost while satisfying the BER at the destination node, and determining an optimal placement of the 2R and 3R regenerators along a route in the optical transmission.
    Type: Grant
    Filed: October 4, 2012
    Date of Patent: November 4, 2014
    Assignee: NEC Laboratories America, Inc.
    Inventors: Ankitkumar N. Patel, Philip Nan Ji, Ting Wang, Yoshiaki Aono
  • Patent number: 8873949
    Abstract: A bit error generating device includes a light source, an input device, and a control processor. The control processor includes logic configured to: receive protocol or bitrate information regarding a live traffic signal via the input device; determine bit error simulation signal parameters based on the received protocol or bitrate information; configure the light source to generate the bit error simulation signal based on the bit error simulation signal parameters; and instruct the light source to inject the bit error simulation signal into an optical fiber carrying the live traffic signal.
    Type: Grant
    Filed: July 2, 2013
    Date of Patent: October 28, 2014
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Scott R. Kotrla, Matthew W. Turlington, Michael U. Bencheck, Tiejun J. Xia
  • Patent number: 8873948
    Abstract: A border node of an optical network receives optical channel traffic parameter(s) associated with an optical channel from an optical channel originator external to the optical network. The received parameters are used to determine the suitability of at least one optical path within the optical network for an externally originating optical channel. If a suitable optical path is determined, an optical channel availability message indicating the availability at the border node of an optical path within the optical network for the optical channel is sent to the optical channel originator. The optical channel originator determines an available optical channel status of the optical channel from the received optical channel availability message for the optical channel.
    Type: Grant
    Filed: April 27, 2011
    Date of Patent: October 28, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (Publ)
    Inventors: Diego Caviglia, Giulio Bottari, Daniele Ceccarelli
  • Patent number: 8873946
    Abstract: A system and method is disclosed that allows for the monitoring, analyzing and reporting on performance, availability and quality of optical network paths. The correlation of PM parameter metrics to client connections, coupled with threshold-based alarm generation provides a proactive and predictive management, reporting and analyzing of the health and effectiveness of individual path connections to alert Operational Support (OS) staff and/or customers to signal degradation and impending Network Element (NE) failures. The system and method performs in real-time processing intervals required for alarm surveillance in a telecommunications network.
    Type: Grant
    Filed: September 7, 2012
    Date of Patent: October 28, 2014
    Assignee: AT&T Intellectual Property II, L.P
    Inventors: David Mayo, Meei-Ling Chen
  • Patent number: 8811815
    Abstract: A method includes generating a test signal and modulating the test signal. The method may also include transmitting the test signal on an optical path, where the optical path may include a number of add-drop multiplexer devices and amplifiers. The method may also include receiving the test signal at a destination device and converting the received test signal into an electrical signal. The method may further include identifying a portion of the electrical signal that is associated with the modulated test signal.
    Type: Grant
    Filed: April 20, 2009
    Date of Patent: August 19, 2014
    Assignee: Verizon Patent and Licensing Inc.
    Inventors: Tiejun J. Xia, Glenn A. Wellbrock
  • Patent number: 8798461
    Abstract: In a passive optical network, a downstream transmission rate from an OLT to multiple ONTs can be optimized by matching a transmission scheme for frames addressed to a channel to the downstream transmission characteristics of the channel. An FEC coding can be made channel dependent so that channels with low error rates can use minimal protection, and therefore minimal overhead, while channels with high input bit error rates can use the level of FEC coding required to produce a desired output bit error rate.
    Type: Grant
    Filed: September 20, 2011
    Date of Patent: August 5, 2014
    Assignee: Alcatel Lucent
    Inventor: Adriaan J. de Lind van Wijngaarden
  • Publication number: 20140186029
    Abstract: Methods and devices for laser driver calibration are disclosed. The methods and devices disclose determining first and second bit error rates for use in calibrating the laser driver. The methods and devices also disclose that if the first bit error rate associated with a first initial value is above a predetermined bit error rate, increasing the first initial value until the first bit error rate is not above the predetermined bit error rate, and if the second bit error rate associated with a second initial value is above a predetermined bit error rate, decreasing the second initial value until the second bit error rate is not above the predetermined bit error rate. In addition, the methods and devices disclose setting a calibrated parameter for the laser driver based, at least in part, on the increased first initial value and the decreased second initial value.
    Type: Application
    Filed: January 3, 2013
    Publication date: July 3, 2014
    Applicant: MELLANOX TECHNOLOGIES, LTD.
    Inventors: Ihab Khoury, Yossi Smeloy
  • Publication number: 20140161443
    Abstract: A system to provide carrier frequency control in an optical network includes a first network element monitoring performance information and a second network element coupled to the first network element by the optical network. The second network element receives performance information from the first network element using an administration channel bandwidth, and modifies a carrier frequency associated with the second network element based on the performance information such that the carrier frequency is aligned to a center of a signal channel bandwidth. A method of providing carrier frequency control includes transmitting performance information by the first network element to the second network element using an administration channel bandwidth, and modifying the carrier frequency by the second network element based on the performance information such that the carrier frequency is aligned to the center of the signal channel bandwidth.
    Type: Application
    Filed: December 7, 2012
    Publication date: June 12, 2014
    Applicant: AT&T INTELLECTUAL PROPERTY I, L.P.
    Inventor: Xiang Zhou
  • Patent number: 8750713
    Abstract: The disclosure relates to optical fiber transmission systems, and in particular, pertains to the transceiver cards in an optical fiber transport system. In particular the disclosure teaches an improved transceiver card architecture that allows high density, flexibility and interchangeability of functionality.
    Type: Grant
    Filed: February 27, 2012
    Date of Patent: June 10, 2014
    Assignee: Pivotal Decisions LLC
    Inventors: Samir Satish Sheth, Marvin R. Young, Jeffrey Lloyd Cox, John W. Ayres, III
  • Patent number: 8713402
    Abstract: A transmission system carrying out sending and receiving of OTU frames has a first transmission device carrying out the sending of an OTU frame, and a second transmission device carrying out the receiving of the OTU frame. The first transmission device calculates BIP-8 for an objective calculation range preset in the OTU frame, inserts the calculation result into the OTU frame, and sends the same. The second transmission device calculates BIP-8 from the received OTU frame for the same objective calculation range as the first transmission device, compares the calculation result with the BIP-8 sent from the first transmission device, and detects any presence of transmission error. The calculation range is set in terms of one of an area including OPU only and an area at least including an arbitrary byte of OTU/ODU overhead.
    Type: Grant
    Filed: August 3, 2011
    Date of Patent: April 29, 2014
    Assignee: NEC Corporation
    Inventor: Kazunori Shinya
  • Patent number: 8699585
    Abstract: Transmitters for data communication can include a pattern generator configured to generate parallel data stream composed of k bits, k being a natural number greater than 2, a serializer configured to convert the parallel data stream into a serial data stream, a pre-emphasis circuit configured to pre-emphasize the serial data stream based on a pre-emphasis control value, to transmit the pre-emphasized serial data stream to a receiver via a first transmission line, and a pre-emphasis controller configured to receive measured values of transmission errors of the pre-emphasized serial data stream from the receiver via a second transmission line, and configured to set the pre-emphasis control value corresponding to a minimum measured value of the transmission errors, to an optimum pre-emphasis control value.
    Type: Grant
    Filed: July 31, 2009
    Date of Patent: April 15, 2014
    Assignee: Samsung Electronics Co., Ltd.
    Inventor: Hitoshi Okamura
  • Patent number: 8687504
    Abstract: A system and method provide enhanced link loss forwarding in an Ethernet system to determine link degradation and to selectively block and re-establish transport between a near end device and far end device based on a SONET connection between end devices and link status detection using local packets. When an excessive number of errors are detected in an Ethernet port, a device enters a Links Off mode from a Transport mode where Ethernet ports are turned off at both ends of a circuit associated with the errors. A Block Transport mode is then entered where local packets (e.g., OAM packets) are monitored to evaluate link quality (e.g., SONET bit error rate). Transport mode is re-established when acceptable link quality is achieved for a selected period of time.
    Type: Grant
    Filed: July 27, 2012
    Date of Patent: April 1, 2014
    Assignee: Hubbell Incorporated
    Inventors: Gary Michael Miller, David Owen Corp
  • Patent number: 8682175
    Abstract: For an optical network link, a receiving node monitors optical performance and upon determination of lowered optical performance for an extended period of time, the node can signal a transmitting node to lower bit transfer rate from a nominal bit transfer rate. The receiving node has a transponder which has a digital electronic variable bandwidth filter to process the digitized signals at the lowered bit transfer rate to increase the SNR of the signals. Optical performance of the link is optimized although at the lowered bit transfer rate.
    Type: Grant
    Filed: August 28, 2008
    Date of Patent: March 25, 2014
    Assignee: Cisco Technology, Inc.
    Inventors: Fabrizio Forghieri, Luca Della Chiesa
  • Patent number: 8655169
    Abstract: Consistent with the present disclosure, based on system requirements or in response to an increase in optical signal-to-noise level of an optical channel, such as a WDM channel, additional FEC bits are inserted into and replace selected data payload bits in each frame carried by the channel. The replaced data payload bits may then be transmitted in subsequent frames on the same channel. As a result, the transmitted frames have a reduced data payload rate, but a higher coding gain. Alternatively, the replaced data payload bits may be included in frames transmitted on another optical channel. In that case, the frames carried by the two channels typically have the same bit length or number of bits and may thus be compliant with the frame length requirements of G.709, for example. Preferably, the number of coding bits may be changed dynamically to obtain different coding gains.
    Type: Grant
    Filed: September 29, 2008
    Date of Patent: February 18, 2014
    Assignee: Infinera Corporation
    Inventors: Drew D. Perkins, David F. Welch
  • Patent number: 8649678
    Abstract: The technique for improving the efficiency in use of power resources while maintaining the received signal quality that satisfies the requirement during a system operation is disclosed. The frame processing apparatus disclosed in the present case includes: a frame processing unit which performs frame processing on an input signal in the designated error processing mode; and a controlling unit which receives the monitoring result relating to the signal quality of the input signal and performs switching control of the designation of the above error processing mode in the frame processing unit based on the received monitoring result.
    Type: Grant
    Filed: June 22, 2009
    Date of Patent: February 11, 2014
    Assignee: Fujitsu Limited
    Inventors: Takeshi Hoshida, Katsumi Fukumitsu
  • Patent number: 8644704
    Abstract: In accordance with an embodiment of the present disclosure a method for adaptively spacing channels of an optical network comprises determining a first desired power level of a first channel of an optical network. The method further comprises determining a second desired power level of a second channel of the optical network, the second desired power level being less than the first desired power level. Additionally, the method comprises determining a first spectral space between the first channel and one or more channels neighboring the first channel based at least on the first desired power level. The method also comprises determining a second spectral space between the second channel and one or more channels neighboring the second channel based at least on the second desired power level, the second spectral space less than the first spectral space.
    Type: Grant
    Filed: April 21, 2011
    Date of Patent: February 4, 2014
    Assignee: Fujitsu Limited
    Inventors: Olga I Vassilieva, Motoyoshi Sekiya, Martin Bouda
  • Publication number: 20140023362
    Abstract: An apparatus including a polarization controller is described. The polarizer controller is communicatively coupled via a feedback loop to an evaluation module located near an optical receiver. The evaluation module is configured to measure polarization dependent loss (PDL) of an optical signal received at the optical receiver. The polarization controller is configured to receive feedback control data regarding the PDL from the evaluation module. Additionally, the polarization controller is configured to modify a state of polarization of the optical signal at an optical transmitter, which is communicatively coupled to the optical receiver, based on the feedback control data.
    Type: Application
    Filed: July 18, 2012
    Publication date: January 23, 2014
    Applicant: FUJITSU LIMITED
    Inventors: Olga VASSILIEVA, Inwoong KIM, Motoyoshi SEKIYA
  • Publication number: 20130336649
    Abstract: An optical transport system in which (i) an optical transmitter is configured to adaptively change an operative constellation to use a constellation that provides optimal performance characteristics for the present optical-link conditions and/or (ii) an optical receiver is configured to change shapes of the decision regions corresponding to an operative constellation to adapt them to the type of signal distortions experienced by a transmitted optical signal in the optical link between the transmitter and receiver. Under some optical-link conditions, the optical receiver might use a decision-region configuration in which a decision region corresponding to a first constellation point includes an area that is closer in distance to a different second constellation point than to the first constellation point.
    Type: Application
    Filed: June 18, 2012
    Publication date: December 19, 2013
    Applicant: ALCATEL-LUCENT USA INC.
    Inventors: René-Jean Essiambre, Chongjin Xie
  • Publication number: 20130308937
    Abstract: In one embodiment, a media access controller includes first and second optical line terminals with a receiver for adjacent first and second wavelength ranges, respectively, and an optical network unit with a transmitter having a transmitter wavelength which drifts between the first and the second wavelength range. The media access controller is configured to assign the optical network unit to the first and the second optical line terminals, such that an optical burst transmitted by the optical network unit is received by the first optical line terminal and the second optical line terminal. The media access controller is configured to determine first and second qualities of the optical burst received by the first and second optical line terminals, respectively, and to determine an estimate of the transmitter wavelength based on the first quality and the second quality.
    Type: Application
    Filed: January 31, 2012
    Publication date: November 21, 2013
    Applicant: ALCATEL-LUCENT
    Inventors: Wolfgang Pöhlmann, Thomas Pfeiffer, Ronald Heron
  • Publication number: 20130294767
    Abstract: Embodiments of the present invention provide a method and device for optimizing performance of an optical module. The optical module includes: an optical receiver, configured to receive an optical signal from an optical network, convert the optical signal into a first electrical signal, and process the first electrical signal according to a set control parameter for performance optimization, so as to obtain a second electrical signal; a connector, configured to send the second electrical signal obtained by the optical receiver to a host connected to the optical module, so that the host obtains bit error information according to the second electrical signal, and configured to receive the bit error information delivered by the host; and a processor, configured to adjust, according to the bit error information of the connector, the control parameter for performance optimization of the optical receiver.
    Type: Application
    Filed: April 17, 2013
    Publication date: November 7, 2013
    Inventors: Changjun ZHANG, Bo WANG, Jianmin TANG, Leiying PAN