Monitoring Patents (Class 398/33)
  • Patent number: 10651958
    Abstract: In one embodiment, an apparatus includes a bi-directional coupler for coupling an upstream signal and a downstream signal to a termination load. A test point detection mechanism is configured to detect when a test point device is inserted in a test point connector. The test point device is configured to perform a test of the upstream signal or the downstream signal. A switch is configured to switch from being coupled to the termination load to being coupled to the test point device when the test point device is detected as being inserted in the test point connector. The switch is configured to switch from being coupled to being coupled to the test point device to the termination load when the test point device is detected as being removed from being inserted in the test point connector.
    Type: Grant
    Filed: October 17, 2018
    Date of Patent: May 12, 2020
    Assignee: ARRIS Enterprises LLC
    Inventors: Zhijian Sun, Eric J. Cormier
  • Patent number: 10601504
    Abstract: Embodiments of this disclosure provide an apparatus and method for monitoring a polarization dependent loss, a receiver and a communication system. The apparatus for monitoring a polarization dependent loss includes: a first processing unit configured to process received optical signals, to obtain a first correlation matrix of noise signals in the received optical signals and a second correlation matrix of second signals or other signals in the received optical signals other than first signals or spectral feature signals having predetermined spectral features; a matrix subtraction unit configured to subtract the second correlation matrix by the first correlation matrix, to obtain a third matrix; and a calculating unit configured to perform singular value decomposition on the third matrix, and calculate a polarization dependent loss according to a result of the singular value decomposition. According to the embodiments of this disclosure, the polarization dependent loss may be calculated more accurately.
    Type: Grant
    Filed: September 10, 2018
    Date of Patent: March 24, 2020
    Assignee: FUJITSU LIMITED
    Inventors: Huihui Li, Zhenning Tao
  • Patent number: 10476737
    Abstract: Embodiments of the present disclosure disclose a hybrid fiber coaxial (HFC) network fault locating method and apparatus. The method includes: obtaining a fault group in an HFC network; collecting a pre-equalization coefficient of at least one cable modem (CM); enabling a reference fault point that is corresponding to the fault group and whose location is known; collecting the pre-equalization coefficient of the at least one CM again; and determining a relative distance between each fault point in the fault group and the reference fault point according to the pre-equalization coefficient collected twice. In the present disclosure, not only each fault point in a fault group including a plurality of fault points can be located, but also a fault group including only a single fault point can be located.
    Type: Grant
    Filed: May 4, 2018
    Date of Patent: November 12, 2019
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Xiaolong Zhang, Chenghu Shen
  • Patent number: 10404385
    Abstract: A measurement system for measuring signals in a RF device comprises at least two signal generators for generating a test signal in each one of the signal generators, a probe for every signal generator, each probe being connected to the respective signal generator for emitting the respective test signal to the RF device, and a controllable positioner for rotatably positioning the RF device with respect to the probes.
    Type: Grant
    Filed: January 24, 2017
    Date of Patent: September 3, 2019
    Assignee: ROHDE & SCHWARZ GMBH & CO. KG
    Inventor: Alexander Pabst
  • Patent number: 10333627
    Abstract: The present invention is directed to a communication signal tracking system comprising an optical receiver including one or more delay line interferometers (DLIs) configured to demultiplex incoming optical signals and a transimpedance amplifier configured to convert the incoming optical signals to incoming electrical signals. The communication signal tracking system further includes a control module configured to calculate a bit-error-rate (BER) of the incoming electrical signals before forward-error correction decoding, and use the BER as a parameter for optimizing settings of the one or more DLIs in one or more iterations in a control loop and generating a back-channel data.
    Type: Grant
    Filed: June 26, 2017
    Date of Patent: June 25, 2019
    Assignee: Inphi Corporation
    Inventors: Todd Rope, Sung Choi, James Stewart, Radhakrishnan L. Nagarajan, Paul Yu, Ilya Lyubomirsky
  • Patent number: 10218434
    Abstract: The invention relates to a device and a method performed by the device of monitoring an optical fibre link. The method provided for monitoring an optical fibre link comprises generating a monitoring signal used for monitoring the optical fibre link, combining the generated monitoring signal with a data signal to be transmitted over the optical fibre link, detecting backscattering of the monitoring signal from the optical fibre link, comparing the detected backscattered monitoring signal with an estimated monitoring signal backscattered along the optical fibre link, and determining, based on the comparison, at least one location along the optical fibre link where the monitoring signal is backscattered, and signal loss caused by the backscattering.
    Type: Grant
    Filed: January 21, 2015
    Date of Patent: February 26, 2019
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Jean Pierre von der Weid, Gustavo Castro do Amaral, Renata Goldman Leibel, Diego Rodrigo Villafani Caballero
  • Patent number: 10122460
    Abstract: A chromatic dispersion compensation apparatus for automatic compensation of chromatic dispersion of signals transmitted via an optical link at predetermined wavelengths of WDM channels within a predetermined band. A tapping unit taps optical signals received by the chromatic dispersion compensation apparatus via the optical link at predetermined wavelengths and supply them to an optical coherent receiver adapted to tune its local oscillator to WDM channels to generate corresponding analog electrical signals of the WDM channels which are sampled by an analog digital converter to provide digital signal samples of WDM channels processed by a digital signal processor of the chromatic dispersion compensation apparatus to calculate an estimate residual chromatic dispersion value of the received optical signals.
    Type: Grant
    Filed: January 13, 2017
    Date of Patent: November 6, 2018
    Assignee: ADVA Optical Networking SE
    Inventors: Mohammad Alfiad, Sorin Tibuleac, Cornelius Fuerst, Christophe Meyer
  • Patent number: 10090919
    Abstract: A method and apparatus for logging transient events of an optical fiber span within a fiber optic system, the method comprising the steps of sampling measured values of at least one signal parameter of an optical signal transported through said optical fiber span, OFS; processing the sampled measurement values to detect an occurrence of a transient event during transport of the optical signal through said optical fiber span, OFS; and providing each detected transient event with a time stamp for correlation with other monitored events within said fiber optic system.
    Type: Grant
    Filed: August 12, 2016
    Date of Patent: October 2, 2018
    Assignee: ADVA OPTICAL NETWORKING SE
    Inventor: Richard Harris
  • Patent number: 10084539
    Abstract: Systems, methods, and devices are disclosed for monitoring optical communications between a managed location and a remote location. In particular, an optical signal is transmitted over an optical fiber and passed-through a test device. A portion of the optical signal is filtered from the original optical signal and passed to a monitoring unit. The monitoring unit may instruct one or more switches in the test device to loop the optical signal back toward the managed location. Subsequently, testing and monitoring may be performed at the managed location. The device may provide a test output or may transmit the information to the managed location.
    Type: Grant
    Filed: June 6, 2017
    Date of Patent: September 25, 2018
    Assignee: Level 3 Communications, LLC
    Inventors: Jeffrey K. Storey, John F. Waters, Andrew Dugan, Salvador Parades, Gary Ratterree
  • Patent number: 10032251
    Abstract: The present disclosure relates to a display device, a display system and a resolution adjusting method. The display device comprises a display screen, and further comprises: a distance sensor and an adjusting unit, wherein the distance sensor comprises: a particle emitter for emitting a first particle beam to a viewer; a particle receiver for receiving the first particle beam reflected by the viewer, and wherein the adjusting unit adjusts a resolution of the display screen based on an energy density of the emitted first particle beam and an energy density of the received first particle beam.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: July 24, 2018
    Assignees: BOE TECHNOLOGY GROUP CO., LTD, BEIJING BOE OPTOELECTRONICS TECHNOLOGY CO., LTD.
    Inventors: Wei Wang, Hao Zhang, Lingyun Shi, Xue Dong, Chong Liu
  • Patent number: 9918150
    Abstract: An optical line terminal (OLT) that configures a passive optical network (PON) system in cooperation with an optical network unit (ONU). The OLT has a controller to control a link state with the ONU. The controller generates, in one case, a control signal specifying a first low power consumption mode in which the ONU operates in the low power consumption mode in an upstream direction, and generates, in another case, the control signal specifying a second low power consumption mode in which the ONU operates in the low power consumption mode in both upstream and downstream directions. Further, the generated control signal is transmitted to the ONU.
    Type: Grant
    Filed: June 8, 2009
    Date of Patent: March 13, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventor: Akihiro Tsuji
  • Patent number: 9900671
    Abstract: Example embodiments of the present invention relate to an optical signal processor comprising of at least one wavelength processing device, a plurality of optical amplifying devices, and a least one field programmable photonic device.
    Type: Grant
    Filed: November 29, 2016
    Date of Patent: February 20, 2018
    Inventors: Mark E. Boduch, Kimon Papakos
  • Patent number: 9852057
    Abstract: Embodiments of a device and method to automatically acquire signal quality metrics in a digital communication system are disclosed. The device may include acquisition means to sample the likelihood of a digital communication signal passing through a grid of time and amplitude regions, and storage means by which such likelihood measurements may be accumulated in a computer memory array for analysis. A state machine may execute a method that controls both the acquisition means and the storage means, requiring minimal intervention from supervisory systems.
    Type: Grant
    Filed: June 24, 2015
    Date of Patent: December 26, 2017
    Assignee: Finisar Corporation
    Inventors: Henry Meyer Daghighian, Lucy G. Hosking, Gilles P. Denoyer
  • Patent number: 9825696
    Abstract: Systems and methods of Ethernet link state signaling through a packet fabric with an Ethernet service transported over Optical Transport Network (OTN) utilizing Generic Framing Procedure Framed (GFP-F) mapping include demapping packets received from an OTN container over GFP-F; detecting a condition associated with the Ethernet service; and causing insertion of maintenance signals in OTN overhead based on the condition instead of using GFP-F Client Management Frames (CMF). The GFP-F mapping can be compliant to ITU-T Recommendation G.Sup43 (02/11) clause 6.2.
    Type: Grant
    Filed: January 13, 2016
    Date of Patent: November 21, 2017
    Assignee: Ciena Corporation
    Inventors: Onder Yazar, Kyle Barr, Maha Beshara
  • Patent number: 9806807
    Abstract: Methods, systems, and apparatus for automatically identifying rogue Optical Network Unit (ONU) are disclosed. In one aspect, an Optical Line Terminal (OLT) determines dark power on a fiber optic link over a period of time. For a given ONU, the OLT determines an optical power of high signals and an optical power of low signals received over the fiber optic link during a timeslot assigned to the given ONU, determines a modified optical power of the high signals and a modified optical power of the low signals based on differences between the optical power of the respective signals and the dark power, determines an extinction ratio based on a ratio of the modified optical power of the high signals relative to the modified optical power of the low signals, and identifies the given ONU as a rogue ONU when the extinction ratio is outside of a specified range.
    Type: Grant
    Filed: July 12, 2016
    Date of Patent: October 31, 2017
    Assignee: ADTRAN, Inc.
    Inventors: Leif Sandstrom, Daniel M. Joffe, John G. Brooks, George Bekken
  • Patent number: 9762318
    Abstract: A time synchronization apparatus and method for automatically detecting the asymmetry of an optical fiber.
    Type: Grant
    Filed: July 10, 2013
    Date of Patent: September 12, 2017
    Assignee: ZTE CORPORATION
    Inventors: Jianxin Xu, Li He, Liang Xia
  • Patent number: 9537570
    Abstract: An optical transceiving apparatus includes an optical transmitting device performing polarization multiplexing on and transmitting as polarization multiplexed signal light, a first signal light of a predetermined polarization direction and a second signal light of a polarization direction different from the predetermined polarization direction; an optical receiving device receiving the signal light transmitted from the optical transmitting device through an optical transmission path; an acquiring unit acquiring information indicative of magnitude relation of intensity between the first signal light and the second signal light included in the signal light received by the optical receiving device; and a control unit controlling the magnitude relation of intensity between the first signal light and the second signal light included in the signal light output from the optical transmitting device, to be opposite to the magnitude relation indicated by the information acquired by the acquiring unit.
    Type: Grant
    Filed: February 14, 2013
    Date of Patent: January 3, 2017
    Assignee: FUJITSU LIMITED
    Inventors: Noriaki Mizuguchi, Hiroaki Tomofuji
  • Patent number: 9432755
    Abstract: An OLT comprising a processor configured to calculate a downstream bandwidth map that indicates an active period of time when the OLT is scheduled to transmit a data frame to an ONU, and generate a message comprising the downstream bandwidth map, and a transmitter coupled to the processor and configured to send the message to the ONU via a PON, wherein the message instructs the ONU to power off at least one ONU receive data processing unit outside the active period. Also disclosed is a computer program product comprising computer executable instructions stored on a non-transitory computer readable medium such that when executed by a processor cause an ONU to receive a message indicating an active period, wherein the active period indicates a scheduled period during which data communicated over a PON is relevant to the ONU and power down an ONU receive data processing unit outside the active period.
    Type: Grant
    Filed: February 13, 2014
    Date of Patent: August 30, 2016
    Assignee: Futurewei Technologies, Inc.
    Inventors: Yuanqiu Luo, Frank Effenberger
  • Patent number: 9209925
    Abstract: An embodiment of the invention provides communications services to Optical Network Terminals (ONTs) in a Passive Optical Network (PON) with at least two Optical Line Terminals (OLTs). The role of these OLTs is autonomously governed based on characteristics of upstream signals from the ONTs. When an OLT in a standby mode determines that upstream signal power is below a power threshold, the OLT in standby mode changes its mode and operates in the active mode. An OLT in active mode monitors the upstream signals and determines the number of upstream signals that are misaligned to a respective downstream command sent from the active OLT. When the number of misaligned signals is greater than a counts threshold, the active OLT switches its operation and operates in standby mode. Through autonomous operation, the OLTs provide redundancy for the PON without added control channel complexity.
    Type: Grant
    Filed: March 12, 2013
    Date of Patent: December 8, 2015
    Assignee: Tellabs Bedford, Inc.
    Inventors: Craig L. Lutgen, Thomas R. Dobozy, Mahlon D. Kimbrough
  • Patent number: 9172469
    Abstract: Exemplary embodiments of the invention relate to an optical transceiver module having a diagnostic communications link, wherein the link is configured to access diagnostic and other data contained within the transceiver controller via a backdoor interface. Controller data, including operational parameter values and module setup values, is accessible while the transceiver operates in conjunction with an external host and may be retrieved, and sometimes modified, in real time without interrupting normal transceiver operation or suspending the transmission of data over optical fibers. The data is accessed with an external user device via a backdoor interface on the outside of the transceiver module.
    Type: Grant
    Filed: August 5, 2013
    Date of Patent: October 27, 2015
    Assignee: FINISAR CORPORATION
    Inventor: Lucy G. Hosking
  • Patent number: 9130351
    Abstract: Systems and methods for modulating the output of a difference frequency generator such as an OPO, OPA or OPG include a pump fiber laser having at least one internal, directly modulatible component, wherein the pump fiber laser produces a pump signal, and a difference frequency generator coupled to the pump fiber laser. The difference frequency generator is configured for accepting the pump signal of the pump fiber laser and producing an output signal, wherein parameters of the output signal are determined based on direct modulation of the internal, directly modulatible component of the pump fiber laser.
    Type: Grant
    Filed: December 7, 2009
    Date of Patent: September 8, 2015
    Assignee: ELBIT SYSTEMS ELECTRO-OPTICS ELOP LTD.
    Inventors: Zachary Sacks, Doron Chomsky, Dov Abramovich, Doron David
  • Patent number: 9083464
    Abstract: A passive optical network (PON) has an optical line termination (OLT) that terminates an optical fiber servicing a plurality of optical network units (ONUs). Each ONU has one or more traffic containers (TCONTs) addressable by the OLT. The PON dynamic bandwidth allocation (DBA) implements a scheduling hierarchy, including several scheduling layers, such that disjoint sets of TCONTs can be grouped together, then disjoint sets of groups can be grouped, and so on. In such hierarchy, the residential traffic can be grouped separately from the business traffic. Further, within either the residential or business group, traffic may be grouped to define scheduling layers (“sub-groups”) within the residential or business group. Scheduling in one group or sub-group is performed independently of the scheduling in other groups or sub-groups, subject to the available bandwidth for each group.
    Type: Grant
    Filed: May 6, 2013
    Date of Patent: July 14, 2015
    Assignee: ADTRAN, Inc.
    Inventor: Richard Goodson
  • Patent number: 9036991
    Abstract: An optical transceiver has a communications mode and an optical time domain reflectometer (OTDR) mode. The transceiver comprises a transmitter channel and a receiver channel operable, in the communications mode, to respectively transmit and receive communications signals through respective external optical fibers. The transceiver also comprises a guide arrangement for guiding, in the OTDR mode, a reflected OTDR signal along a path from the transmitter channel into the receiver channel. A method of obtaining test data for an optical fiber in an optical data communications subsystem is also disclosed.
    Type: Grant
    Filed: October 30, 2009
    Date of Patent: May 19, 2015
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Jerry G. Aguren
  • Patent number: 9031415
    Abstract: An Ethernet adapter system may include a transmitter to insert a payload type identifier sequence in a generic frame procedure header to indicate that a network is a converged enhanced Ethernet network. The transmitter may insert idle sequences in a stream of data frames transmitted along a link. The system may include a receiver to recognize a condition and to force a loss of synchronization condition on the link that will be converted by the receiver into a loss of light condition. The receiver may scan the transmitted stream of data frames for invalid data frames and introduce a code into the stream of data frames whenever an invalid data frame is detected.
    Type: Grant
    Filed: December 8, 2012
    Date of Patent: May 12, 2015
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Thomas A. Gregg, Rajaram B. Krishnamurthy
  • Publication number: 20150125143
    Abstract: Systems and method for monitoring a dual-polarization signal are disclosed. The systems and methods include adding a first supervisory signal to a first polarization component of the dual-polarization signal to get a first combined signal, adding a second supervisory signal to a second polarization component of the dual-polarization signal to get a second combined signal, and in the electrical domain, performing a polarization scanning technique on the first and second combined signals.
    Type: Application
    Filed: November 4, 2013
    Publication date: May 7, 2015
    Applicant: Fujitsu Limited
    Inventors: Olga Vassilieva, Inwoong Kim, Motoyoshi Sekiya
  • Publication number: 20150125144
    Abstract: Methods, systems, and computer readable media for locating a physical connector module are disclosed. According to one aspect, the subject matter described herein a method that includes selecting, via a locator beacon activation control function, a physical connector module to be located. The method further includes communicating, from the locator beacon activation control function, a locator beacon activation signal to a locator beacon activation client function included in the selected physical connector module and, in response to receiving the locator beacon activation signal at the locator beacon activation client function, triggering a transmission of a locator beacon from the selected physical connector module.
    Type: Application
    Filed: March 6, 2014
    Publication date: May 7, 2015
    Inventor: Matthew R. Bergeron
  • Publication number: 20150117857
    Abstract: Systems and method for monitoring a dual-polarization signal are disclosed. The systems and methods include adding a first supervisory signal to a first polarization component of the dual-polarization signal to get a first combined signal and adding a second supervisory signal to a second polarization component of the dual-polarization signal to get a second combined signal, either in the electrical or optical domain. The supervisory signal is arbitrary, non-complementary, and modulated at a amplitude substantially lower than the modulation frequency of the dual-polarization signal. The systems and methods further include analyzing the supervisory signal upon receipt.
    Type: Application
    Filed: October 30, 2013
    Publication date: April 30, 2015
    Applicant: Fujitsu Limited
    Inventors: Olga Vassilieva, Inwoong Kim, Jeng-Yuan Yang, Motoyoshi Sekiya
  • Publication number: 20150117856
    Abstract: Systems and methods for monitoring a dual-polarization signal are disclosed. The systems and methods include extracting a portion of the dual-polarization signal, wherein the dual-polarization signal includes multiple supervisory signals, each associated with a polarization component of a main data signal, measuring a power level of the first and second supervisory signals, and determining a power imbalance between the polarization components of the main data signal based at least on the power level.
    Type: Application
    Filed: October 30, 2013
    Publication date: April 30, 2015
    Applicant: Fujitsu Limited
    Inventors: Olga Vassilieva, Inwoong Kim, Jeng-Yuan Yang, Motoyoshi Sekiya
  • Patent number: 9008514
    Abstract: Example embodiments of the present invention relate to An optical node comprising of at least two optical degrees; a plurality of directionless add/drop ports; and at least one wavelength equalizing array, wherein the at least one wavelength equalizing array is used to both select wavelengths for each degree, and to perform directionless steering for the add/drop ports.
    Type: Grant
    Filed: June 22, 2013
    Date of Patent: April 14, 2015
    Inventors: Mark E. Boduch, Kimon Papakos
  • Patent number: 9008500
    Abstract: The invention discloses a system, a method and an apparatus for optical network protection. The system includes: an output control apparatus for obtaining protection mode information configured by a system and controlling an input signal to be output from a set line corresponding to said protection mode information; and a detection control apparatus for detecting powers of signals transmitted on an active line and on a standby line, if it is determined that the active line is abnormal and the standby line is normal according to detection results, then controlling the input signal to be output from a protection line corresponding to the protection mode information; if it is determined that the active line is normal, or that the active line and the standby line are abnormal according to the detection result, then controlling the input signal to be output from a set line corresponding to the protection mode information.
    Type: Grant
    Filed: September 28, 2009
    Date of Patent: April 14, 2015
    Assignee: ZTE Corporation
    Inventor: Hongbing Zou
  • Publication number: 20150086196
    Abstract: A transport apparatus configured to transport a main signal received via one of a plurality of ports to any of the plurality of ports, the transport apparatus includes: a plurality of main signal processing circuits configured to extract a monitoring control signal from the main signal, the plurality of main signal processing circuits being provided to correspond to the plurality of ports, respectively; a monitoring controller configured to receive the monitoring control signal from the plurality of main signal processing circuits; and a serial interface configured to connect the plurality of main signal processing circuits with the monitoring controller on a ring-shaped bus to transfer a serial frame, wherein the serial frame has a mapping field to which the monitoring control signal is mapped.
    Type: Application
    Filed: August 25, 2014
    Publication date: March 26, 2015
    Applicant: FUJITSU LIMITED
    Inventors: Hideaki Tazawa, Hiroshi Nishida
  • Patent number: 8989572
    Abstract: An optical node apparatus that establishes an optical path between a first optical node and a second optical node in an optical network include a frequency modulation unit that superimposes a supervisory signal on a main signal by frequency-modulating the main signal, and a frequency demodulation unit that frequency-demodulates the supervisory signal superimposed on the received main signal.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: March 24, 2015
    Assignee: Fujitsu Limited
    Inventors: Takahito Tanimura, Takeshi Hoshida, Hisao Nakashima
  • Patent number: 8989573
    Abstract: A sensing apparatus includes: a broadband optical source; a first pseudorandom number generator generating a first pseudorandom number code string to modulate the broadband optical source; at least one sensor reflecting an output of the first pseudorandom number generator at a wavelength corresponding to a center wavelength thereof when the output of the first pseudorandom number generator is inputted; a wavelength-time converter converting an output of the sensor by wavelength-time conversion; a second pseudorandom number generator generating a second pseudorandom number code string which is different in frequency from and is the same in bit length and code string as the first pseudorandom number code string; a mixer mixing an output signal of the wavelength-time converter with an output signal of the second pseudorandom number generator; and an integrator integrating an output of the mixer.
    Type: Grant
    Filed: March 28, 2013
    Date of Patent: March 24, 2015
    Assignee: Gwangju Institute of Science and Technology
    Inventors: Chang-Soo Park, Young-Bok Kim, Sie-Wook Jeon
  • Patent number: 8989574
    Abstract: A WDM signal light monitoring device includes a first monitor for monitoring input-side WDM main signal light and output-side WDM main signal light for each wavelength; and a second monitor for monitoring the first monitor by comparing a monitoring result received from an upstream WDM transmission device with a monitoring result of the first monitor, wherein the monitoring result of the first monitor is transmitted to a downstream WDM transmission device in the system.
    Type: Grant
    Filed: October 8, 2010
    Date of Patent: March 24, 2015
    Assignee: NEC Corporation
    Inventor: Baku Kikuchi
  • Patent number: 8983290
    Abstract: Systems and method for monitoring an optical power of a dual-polarization signal are disclosed. The systems and methods may include measuring a first parameter set associated with a supervisory signal, the supervisory signal being communicated in-band with the dual-polarization signal; calculating a second parameter set from the first parameter set; calculating an intensity value from the second parameter set, the intensity value associated with one of the polarization states of the dual-polarization signal; and estimating a signal power associated with the supervisory signal from the intensity value.
    Type: Grant
    Filed: June 24, 2013
    Date of Patent: March 17, 2015
    Assignee: Fujitsu Limited
    Inventors: Inwoong Kim, Olga Vassilieva, Paparao Palacharla, Motoyoshi Sekiya, Jeng-Yuan Yang
  • Patent number: 8983286
    Abstract: A node of an optical transport network system transmits optical wavelengths to an adjacent node through an operational line. An apparatus for protection switching of the optical transport network system transmits only an optical channel with a fault among a plurality of optical channels composed of flexible optical channel data units in an optical wavelength of the operational line, via a reserve line.
    Type: Grant
    Filed: November 8, 2012
    Date of Patent: March 17, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Ji Wook Youn, Jongho Kim, Jong-Yoon Shin
  • Patent number: 8971701
    Abstract: A universal optical receiver may include an optical channel monitor configured to acquire spectral data for an optical signal on at least one selected optical channel, a tunable local oscillator configured to be tuned to a center frequency of the optical signal on the at least one selected optical channel, a storage device configured to store data associated with the optical signal responsive to acquisition of the spectral data and tuning of the tunable local oscillator, and processing circuitry configured to execute an algorithm that employs a plurality of binary distinctions based on physical characteristics of the optical signal and employs at least one calculation of figure of merit associated with a series of parameter values of the optical signal to identify a format of the optical signal.
    Type: Grant
    Filed: September 4, 2012
    Date of Patent: March 3, 2015
    Assignee: The Johns Hopkins University
    Inventors: Eric J. Adles, Michael L. Dennis, Raymond M. Sova, Joseph E. Sluz, Michael G. Taylor, Curtis R. Menyuk, John W. Zweck
  • Patent number: 8965200
    Abstract: A method, an apparatus and a system for detecting a connection status of an optical fiber jumper are provided in the embodiments of the present invention. The method for detecting a connection status of an optical fiber jumper includes: judging a connection status of a second port and a first port according to whether an optical signal sent by the first port to the second port through a first optical fiber is received, wherein the first optical fiber is connected to two ends of an optical fiber jumper, and the two ends of the optical fiber jumper are connected to the first port and the second port respectively; and obtaining a port identification corresponding to the first port according to the optical signal if the optical signal is received.
    Type: Grant
    Filed: November 21, 2011
    Date of Patent: February 24, 2015
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yunsheng Wen, Jun Zhao, Bo Wang, Xiaolei Shan
  • 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: 8958702
    Abstract: In accordance with the present disclosure, disadvantages and problems associated with polarization dependent effects of a polarization multiplexed optical signal may be reduced through polarization scrambling. In accordance with an embodiment of the present disclosure a method for detecting polarization scrambling of a polarization multiplexed optical signal comprises receiving a polarization multiplexed optical signal associated with an optical network. The polarization multiplexed optical signal including a scrambled polarization orientation, the polarization orientation scrambled according to a scrambling frequency. The method further comprising receiving a polarization signal indicating the polarization scrambling of the received optical signal. The method additionally comprises descrambling the optical signal according to the polarization scrambling as indicated by the polarization signal.
    Type: Grant
    Filed: March 17, 2011
    Date of Patent: February 17, 2015
    Assignee: Fujitsu Limited
    Inventor: Futoshi Izumi
  • Patent number: 8953948
    Abstract: The present disclosure provides to Optical Transport Network (OTN_ synchronization systems and methods that maintain proper sequential ordering of events at nodes which may be utilized in performing root cause analysis or diagnosing network performance. In an exemplary embodiment, the systems and methods utilize functionality incorporated into OTN providing a cost effective and standards-based approach to nodal synchronization. Once synchronized, network events are logged with an appropriate timestamp enabling a determination of a sequential order of network events can be determined. Further, the node timestamps may be synchronized, with microsecond or even sub-microsecond of precession which is critical in diagnosing network failures or slow traffic recovery.
    Type: Grant
    Filed: November 22, 2011
    Date of Patent: February 10, 2015
    Assignee: Ciena Corporation
    Inventors: Hongxing Meng, Abhishek Chaudhary, Gustav Karl Larsson, Saravanan Purushothaman
  • Patent number: 8948586
    Abstract: There are disclosed systems and methods for detecting whether an Optical Network Unit (ONU) in a network may be causing a communications interference due to laser overlap. In one embodiment, an Optical Line Terminal (OLT) selects a pair of ONUs suspected of possibly causing laser overlap. The OLT then grants a first window to a first ONU for transmitting a first message, and grants to another ONU different from the pair of ONUs a second window for transmitting a second message. If the first message is not received by the OLT, then the OLT indicates that the first ONU may be causing laser overlap. In another embodiment, the OLT grants to an ONU a window for transmitting a message to the OLT. If the message is not received by the OLT when expected, then the OLT indicates that the ONU may be causing laser overlap. Other embodiments are disclosed.
    Type: Grant
    Filed: December 15, 2011
    Date of Patent: February 3, 2015
    Assignee: Cortina Access, Inc.
    Inventors: Dongsheng Zhang, Eugene W. Lee, Wei Yao
  • Publication number: 20150030323
    Abstract: Systems and methods for detecting component rotation within a communication assembly are provided. In certain embodiments, a system includes a module; an adapter block that includes multiple front ports and multiple rear ports configured to receive an optical connector; a managing entity configured to control port identification for the front and rear ports; and a circuit board mounted to the adapter block, wherein the circuit board comprises multiple front contact assemblies and multiple rear contact assemblies, wherein each front port is associated with a front contact assembly and each rear port is associated with a rear contact assembly, wherein when a rear contact assembly is electrically coupled to a connector, the connector generates an event that is sent to the managing entity, whereupon the managing entity remaps the port identification for the front and rear ports.
    Type: Application
    Filed: May 23, 2014
    Publication date: January 29, 2015
    Applicant: ADC Telecommunications, Inc.
    Inventors: Jonathan T. Lawson, Laxman R. Anne, Thomas Marcouiller, Oscar Bran De Leon, Loren Mattson
  • Patent number: 8942555
    Abstract: A system and method for Passive Optical Networks (PON) providing integration (cross-correlation) of powersave and fiber protection, optionally with encryption, facilitating the successful operation and/or benefits that can be gained when operating a PON system with these features. A major problem with power save is the detection, since both the OLT and the ONUs rely on a valid signal in order to detect fiber failure. However, the OLT may not detect this for sleeping ONUs, and an ONU in Tx/Rx sleep-mode, may not detect a fiber failure, and may not be aware of the OLTs switchover. In addition to solving the problem of combined fiber protection and power savings, a solution is also needed for providing security for this combination. A current embodiment is a system and method for Passive Optical Networks (PON) providing integration (cross-correlation) of powersave and fiber protection, optionally with encryption.
    Type: Grant
    Filed: March 7, 2013
    Date of Patent: January 27, 2015
    Assignee: PMC-Sierra Israel Ltd.
    Inventors: Zachi Haramaty, Elan Rohekar, Barak Perlman, Raziel Gabe
  • 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: 8942558
    Abstract: Due to demand for more network bandwidth, a need for multi-user optical network topologies has, and will continue to, increase. A method or corresponding apparatus in embodiments of the present invention provide for an availability determination tool for determining and displaying wavelength and subrate availabilities within a network. Benefits of embodiments of a tool include allowing a user to identify the availability and capacity of any wavelength on any network, via an interactive graphical user interface, such as by using three-dimensional representations. In one embodiment, the disclosed availability determination tool allows users to locate and view any combination of available wavelengths between nodes in an optical network topology, and generate graphical and tabular reports of the availability in order to maintain an efficient and organized method or apparatus for determining and controlling wavelengths in a network.
    Type: Grant
    Filed: May 15, 2013
    Date of Patent: January 27, 2015
    Assignee: Tellabs Operations, Inc.
    Inventors: David W. Jenkins, Ramasubramanian Anand, Hector Ayala, Dion Kwun Kit Leung, Kenneth M. Fisher
  • 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: 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: 8934783
    Abstract: An Ethernet adapter system may include a transmitter to insert a payload type identifier sequence in a generic frame procedure header to indicate that a network is a converged enhanced Ethernet network. The transmitter may insert idle sequences in a stream of data frames transmitted along a link. The system may include a receiver to recognize a condition and to force a loss of synchronization condition on the link that will be converted by the receiver into a loss of light condition. The receiver may scan the transmitted stream of data frames for invalid data frames and introduce a code into the stream of data frames whenever an invalid data frame is detected.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: January 13, 2015
    Assignee: International Business Machines Corporation
    Inventors: Casimer M. DeCusatis, Thomas A. Gregg, Rajaram B. Krishnamurthy