Determined By Reflection From Break In Fiber Patents (Class 398/21)
  • Patent number: 10056975
    Abstract: A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed.
    Type: Grant
    Filed: March 27, 2017
    Date of Patent: August 21, 2018
    Inventors: Alexander Soto, Walter Soto
  • Patent number: 9917637
    Abstract: Methods, optical transmitters and a system of optical transmitters for transmitting data over and monitoring a fiber cable. A method performed by an optical transmitter for transmitting data over and monitoring of a fiber cable comprises generating at least a first optical carrier and a second optical carrier at a same optical frequency, generating an electromagnetic monitoring signal, modulating the first optical carrier with the generated electromagnetic monitoring data signal to create an optical monitoring signal, and modulating the second optical carrier with a generated electromagnetic data signal to create an optical data signal. The method further comprises combining the optical monitoring signal and the optical data signal in orthogonal polarization modes, transmitting the combined optical monitoring signal and the optical data signal over the fiber cable to be monitored, and monitoring the fiber cable by detecting the optical monitoring signal being backscattered from the fiber cable.
    Type: Grant
    Filed: April 21, 2016
    Date of Patent: March 13, 2018
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Gustavo Castro Do Amaral, Diego Rodrigo Villafani Caballero, Luis Ernesto Ynoquio Herrera, Jean Pierre Von Der Weid
  • Patent number: 9660722
    Abstract: A system and method for performing an in-service optical time domain reflectometry test, an in-service insertion loss test, and an in-service optical frequency domain reflectometry test using a same wavelength as the network communications for point-to-point or point-to-multipoint optical fiber networks while maintaining continuity of network communications are disclosed.
    Type: Grant
    Filed: March 3, 2016
    Date of Patent: May 23, 2017
    Inventors: Alexander Soto, Walter Soto
  • Patent number: 9306666
    Abstract: A programming device is provided that programs cards, such as payment cards, with data, such as personal data, using light transmitters and receivers. For example, an infrared transmitter may be provided to program personal data (e.g., a customer's credit card number) into a card wirelessly. In doing so, the card may be, for example, completely laminated such that there are no exposed electronic components on the exterior surface of the card and be programmed via light. The programming device may shield the programming components to block ambient light from interacting with those programming components during programming. A conveyor may be utilized to align multiple cards with a programming device to allow assembly-line style programming of the cards.
    Type: Grant
    Filed: September 24, 2010
    Date of Patent: April 5, 2016
    Assignee: DYNAMICS INC.
    Inventors: Brian Zhang, Bruce S. Cloutier, L. Casimir Mostowy, Jr.
  • Patent number: 9148710
    Abstract: Raman amplifier systems and methods with an integrated Optical Time Domain Reflectometer (OTDR) for integrated testing functionality include an amplifier system, an OTDR and telemetry subsystem, and a method of operation. The OTDR and telemetry subsystem is configured to operate in an OTDR mode when coupled to a line in port and to operate in a telemetry mode when coupled to a line out port. The OTDR and telemetry subsystem enables on-demand fiber testing while also operating as a telemetry channel that is both a redundant optical service channel (OSC) and provides a mechanism to monitor Raman gain over time. The OTDR and telemetry subsystem minimizes cost and space by sharing major optical and electrical components between the integrated OTDR and other functions on the Raman amplifier.
    Type: Grant
    Filed: September 19, 2012
    Date of Patent: September 29, 2015
    Assignee: Ciena Corporation
    Inventors: Jean-Luc Archambault, Jun Bao, Balakrishnan Sridhar
  • Patent number: 9042723
    Abstract: An apparatus and method for fault indication and localization in a Passive Optical Network (PON) comprising a multistage power splitter (100, 200, 300) with at least one 1:N splitter (120, 221, 222, 321, 322) followed by N items of 2:M splitters (131, 132, 231-233, 331-336), wherein N and M are integers greater than 1. The apparatus also comprises an Optical Time Domain Reflectometry (OTDR) device (110, 210, 310) capable of inserting an OTDR signal into the power splitter (100, 200, 300), and adapted to insert the OTDR signal between the first stage of the at least one 1:N splitter (120, 221, 222, 321, 322) and the second N items of 2:M splitters (131, 132, 231-233, 331-336).
    Type: Grant
    Filed: January 15, 2010
    Date of Patent: May 26, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventor: Stefan Dahlfort
  • 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: 9008503
    Abstract: An arrangement in a node in a WDM-PON and a method therein for supervision of the WDM-PON are provided. The arrangement comprises X splitters of splitting ratio 1:Y, each splitter having one input and Y outputs such that X*Y equals N, wherein X, Y, N are integers. The one input of each of the X splitters is configured to receive an Optical Time Domain Reflectometry, OTDR, signal and to split the received OTDR signal into Y OTDR sub-signals such that a total of N OTDR sub-signals are outputted from the X splitters. The arrangement further comprises an N*N Arrayed Waveguide Grating, AWG, and a first filter configured to mix a feeder signal comprising data communication from an Optical Line Termination, OLT, with one of the N OTDR sub-signals. One input of the AWG is configured to receive the mix of the feeder signal and the one OTDR sub-signal, and the remaining N-inputs of the AWG are each configured to receive a respective one of the N-remaining OTDR sub-signals.
    Type: Grant
    Filed: March 21, 2011
    Date of Patent: April 14, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (Publ)
    Inventors: Patryk Urban, Min Cen
  • Patent number: 9008506
    Abstract: A fiber network events measurement apparatus has a laser module alternately generating a pulse signal detecting beam and an FMCW detecting beam. The beams are sent to the fiber network route through a directional coupler. A photo detector receives feedback energy of the beams transmitting in the fiber network route and converts the feedback energy into electronic signals. A mixer uses a frequency difference calculation to obtain a comparison result according to an original and a reflected FMCW signal. The electronic signal is converted into a digital signal by an A/D converter. A signal control unit then obtains a compound trace result including information of characteristic trace and event positions. The compound trace result shows a fiber characteristic trace and event position trace for measuring the fiber network routes.
    Type: Grant
    Filed: February 6, 2013
    Date of Patent: April 14, 2015
    Assignee: Polarlink Technologies, Ltd.
    Inventors: Ching-Wen Hsiao, Hsuan-Hung Wu, Shih-Tien Lin, Fu-Chun Hung, Yu-Shu Chen, Ching-Lin Wu, Chun-Hung Su
  • Patent number: 9002199
    Abstract: An apparatus and method for monitoring an optical line is provided. The optical line monitoring apparatus may include a comparison unit to extract first identification information about an optical network terminal (ONT) from reflected data that is reflected and received from the optical line, and to compare the extracted first identification information to predetermined second identification information about the ONT, and a processor to analyze a state of the optical line using the reflected data when the first identification information is identical to the second identification information.
    Type: Grant
    Filed: January 18, 2013
    Date of Patent: April 7, 2015
    Assignee: Electronics and Telecommunications Research Institute
    Inventors: Mun Seob Lee, Dong Soo Lee, Geun Yong Kim, Hark Yoo, Sung Chang Kim, Young Suk Lee
  • Patent number: 8971704
    Abstract: An optical network (1) comprising an optical network element (10) comprising a first optical transmitter (14), a first controller (16), a first optical receiver and a second optical receiver and a second optical network element (12). There is provided a transmission path (30) between said first optical network element and said second optical network element. Said first optical transmitter is arranged to generate and transmit a first optical signal. Said first controller is arranged to control said first optical transmitter to generate and transmit said first optical signal at a wavelength selected from a predetermined plurality of wavelengths. Said first optical receiver is arranged to detect a backscatter portion of said first optical signal returned to said first optical network element along said transmission path by distributing scattering.
    Type: Grant
    Filed: December 3, 2009
    Date of Patent: March 3, 2015
    Assignee: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Fabio Cavaliere, Luca Giorgi, Renato Grosso, Ernesto Ciaramella
  • Patent number: 8958060
    Abstract: Methods and devices provide for storing historical data that includes interference values mapped to at least one of bend radii values, lifetime values, or failure rate values of optical fibers; transmitting an optical signal, via a test system, toward the optical fiber under test; setting a polarization state of the optical signal before the optical signal propagates through the optical fiber under test; setting a polarization state of a reflected optical signal that has propagated through the optical fiber under test in a manner that causes a minimum interference or a maximum interference; measuring instances of power of the reflected optical signal; and outputting a result that includes at least one of a bend radius value, a lifetime value, or a failure rate that applies to the optical fiber under test based on the measured instances of power and the historical data.
    Type: Grant
    Filed: February 21, 2013
    Date of Patent: February 17, 2015
    Assignee: Verizon Patent and Licensing Inc.
    Inventor: David Zhi Chen
  • Patent number: 8948589
    Abstract: A manner of providing for testing of access fibers in a PON (passive optical network) using OTDR (optical time-domain reflectometry). According to the invention, a PON includes an optical splitter module having one or more optical couplers that combines downstream light from 1×N optical splitter directing the output of an OLT (optical line terminal) and a cyclic AWG (arrayed waveguide grating) for transmission toward one or more ONUs (optical network units). The splitter module is preferably formed on a single semiconductor chip, such as a PIC (photonic integrated circuit) chip and may reside in an outside plant of the PON.
    Type: Grant
    Filed: March 30, 2012
    Date of Patent: February 3, 2015
    Assignee: Alcatel Lucent
    Inventors: Joseph L. Smith, Ronald Heron
  • Patent number: 8942556
    Abstract: An optical transceiver having an integrated optical time domain reflectometer monitoring unit and methods for using the same are disclosed. The disclosure relates to an optical transceiver comprising an optical device comprising a wavelength division multiplexing system (WDM), a data signal driver, a data signal limiting amplifier, and an optical time domain reflectometer (OTDR) data processing module. Furthermore, the optical transceiver is particularly advantageous in an optical line terminal (OLT) and/or a passive optical network (PON). The integrated OTDR data processing module can protect the optical transceiver, ensure successful monitoring data, simplify network wiring and decrease system and network costs by decreasing the number of OTDR modules and WDM units.
    Type: Grant
    Filed: December 2, 2011
    Date of Patent: January 27, 2015
    Assignee: Source Photonics, Inc.
    Inventors: Fuqiang Zhao, Yi Yang, Yong Lu
  • Publication number: 20150023658
    Abstract: A system for supervision of a passive optical network includes an OTDR device, generating N+1 OTDR signals of wavelengths ?U-?N, and transmitting the signals towards ONUs. The system includes a splitter having N output branches. An input of the splitter is connected to the output of the OTDR device and the output branches of the splitter are indirectly connected to the ONUs. The splitter splits the OTDR signals and forwards them towards the ONUs. The system includes a wavelength isolator having inputs connected to the splitter output branches. The wavelength isolator isolates, on individual inputs, one predetermined wavelength of the received OTDR signals per individual input, where two inputs of the wavelength isolator do not isolate the same wavelength, and forwards, from each of the inputs of the wavelength isolator, the OTDR signals to associated outputs towards the ONUs connected to the wavelength isolator by individual fibre links.
    Type: Application
    Filed: March 20, 2012
    Publication date: January 22, 2015
    Applicant: Telefonaktiebolaget L M Ericsson (publ)
    Inventors: Giancarlo Vilela De Faria, Guilherme Penello Temporao, Jean Pierre Von Der Weid
  • Patent number: 8917987
    Abstract: A method for detecting branch fibers is provided, which includes: sending test signals to a plurality of branch fibers, where the test signals are added at ports of the optical splitting module with identification information for identifying branch fibers connected to the ports and receiving a reflection signal added with the identification information of a detected branch fiber, identifying the detected branch fiber corresponding to the reflection signal through detecting the identification information added to the reflection information, and obtaining channel characteristics of the detected branch fiber according to the reflection signal. Further, a system and an apparatus for detecting branch fibers are provided.
    Type: Grant
    Filed: June 21, 2012
    Date of Patent: December 23, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Yunsheng Wen, Jun Zhao, Shijun Wang, Xiaolei Shan, Bo Wang
  • Patent number: 8913887
    Abstract: In a first aspect, the method and apparatus of the present disclosure can be used to periodically and/or intermittently place one or more ONUs attached to a PON in a power savings mode so that an OTDR test can be performed. While in the power savings mode, the ONUs temporarily suspend their transmitter function and power down their upstream lasers. In a second aspect, the method and apparatus of the present disclosure can be used to coordinate the performance of OTDR during one or more periodic or intermittent discovery slots used to detect and register ONUs recently connected to the PON. Because new ONUs are infrequently connected to the PON and ONUs already registered are not permitted to transmit during the discovery windows, OTDR can be performed during these windows without impacting, to a great degree, the normal operation of the PON.
    Type: Grant
    Filed: May 30, 2012
    Date of Patent: December 16, 2014
    Assignee: Broadcom Corporation
    Inventors: Ryan E. Hirth, Lowell D. Lamb
  • Patent number: 8913888
    Abstract: An apparatus comprising an optical transmitter coupled to an optical fiber, and an optical receiver coupled to the optical fiber, wherein the transmitter is configured to transmit a test signal data pattern and user data into the optical fiber, and wherein the receiver is configured to receive a reflection of the test signal data pattern. Also disclosed is a network component comprising a processor configured to implement a method comprising promoting the transmission of an optical test signal data pattern into an optical fiber, wherein the test signal data pattern creates a radio frequency (RF) tone, and detecting a reflection of the RF tone in the optical fiber.
    Type: Grant
    Filed: October 11, 2011
    Date of Patent: December 16, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventor: Frank J. Effenberger
  • 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
  • Publication number: 20140255023
    Abstract: A distributed optical fiber sound wave detection device is provided with an optical pulse emission unit that causes an optical pulse to be incident into the optical fiber, and a Rayleigh scattered light reception unit that receives Rayleigh scattered light produced inside the optical fiber. The optical pulse emission unit outputs the optical pulse that is modulated using a code sequence which has a predetermined length and by which the optical pulse is divided into a plurality of cells. The Rayleigh scattered light reception unit includes a phase variation derivation unit that performs demodulation corresponding to the modulation in the optical pulse emission unit on the Rayleigh scattered light and determines a phase variation thereof from the demodulated Rayleigh scattered light, and a sound wave detection unit that determines a sound wave that has struck the optical fiber from the phase variation determined by the phase variation derivation unit.
    Type: Application
    Filed: September 11, 2012
    Publication date: September 11, 2014
    Applicant: NEUBREX CO., LTD.
    Inventors: Kinzo Kishida, Kenichi Nishiguchi, Che-Hsien Li
  • Patent number: 8831422
    Abstract: The present invention relates to the field of communication transmission, and in particular, to a method for generating a probe pulse and a coherent optical time domain reflectometer. The coherent optical time domain reflectometer includes: a control unit, configured to generate a first pulse signal and a second pulse signal which have a same period T, where the second pulse signal lags behind the first pulse signal, and T satisfies T?t+2L/C; a driving unit, configured to generate a frequency change driving signal according to the first pulse signal; a continuous light laser device, configured to generate, as driven by the frequency change driving signal, continuous light having a changing frequency and an unchanging frequency spectrum width; and a probe pulse generating unit, configured to modulate the continuous light according to the second pulse signal to generate a probe pulse.
    Type: Grant
    Filed: December 27, 2012
    Date of Patent: September 9, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventors: Zhiyong Feng, Shaofeng Qiu, Yijia Wei
  • Publication number: 20140226970
    Abstract: A Wavelength Adaptation Module and a method therein for adapting an Optical Time Domain Reflectometry, OTDR, signal for supervision of Optical Network Terminals, ONTs, in a Passive Optical Network, PON, are provided. The wavelength of the OTDR signal is adapted to have a selected wavelength to enable a splitter in a remote node to forward the OTDR signal to a dedicated group of ONTs in the PON, thereby supervising the fibre links between the remote node and the dedicated group of ONTs. Likewise, a remote node and a method therein for receiving an OTDR signal having a pre-selected wavelength from the Wavelength Adaptation Module and for outputting the OTDR signal to a dedicated group of ONTs with regards to the pre-selected wavelength of the received OTDR signal are provided.
    Type: Application
    Filed: August 24, 2011
    Publication date: August 14, 2014
    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Patryk Urban, Gemma Vall-llosera
  • Patent number: 8805183
    Abstract: An OLT operable in a PON and structured to perform OTDR measurements. The OLT comprises an electrical module for generating continuous downstream signals and processing received upstream burst signals according to a communication protocol of the PON; an optical module for transmitting continuous optical signals over a first wavelength, receiving optical upstream burst signals over a second wavelength, and transmitting optical upstream burst signals over a third wavelength, wherein the optical module further includes an ONU traffic processing module being electrically coupled to the optical module and the electrical module, wherein the ONU traffic processing module is configured to emulate one of a plurality of ONUs of the PON, to generate an analysis pattern to be transmitted as an optical upstream burst signal over a third wavelength, and analyze an analysis pattern received in an optical upstream burst signal for the purpose of performing the OTDR measurements.
    Type: Grant
    Filed: May 23, 2012
    Date of Patent: August 12, 2014
    Assignee: Broadcom Corporation
    Inventor: Amiad Dvir
  • Patent number: 8805184
    Abstract: A method for allocating faults in a passive optical network (PON) by placing a number of passive unique optical correlators in a number of respective diagnostic points of the PON, each of the passive unique optical correlators being responsive to an optical diagnostic signal by returning a predetermined unique matching signal; by further transmitting the diagnostic optical signal in the PON towards the diagnostic points to receive upstream response signals from the correlators. Upon detecting presence or absence, in the received response signals, of a predetermined unique matching signal expected from a specific optical correlator, judging about a fault in proximity of the respective specific diagnostic point.
    Type: Grant
    Filed: June 22, 2011
    Date of Patent: August 12, 2014
    Assignee: ECI Telecom Ltd.
    Inventor: Amitay Melamed
  • Publication number: 20140205279
    Abstract: There are provided a device for monitoring an optical link fault and a method thereof. According to an embodiment of the invention, the device for monitoring an optical link fault and the method thereof apply an optical link fault monitoring signal to an optical link and precisely identify a type of the fault using waveforms of a reflected signal returned from the optical link or a wavelength dependence of reflected signal intensity.
    Type: Application
    Filed: October 15, 2013
    Publication date: July 24, 2014
    Applicant: Electronics and Telecommunications Research Institute
    Inventors: Won-Kyoung LEE, Seung-Il MYONG
  • Patent number: 8755038
    Abstract: A method includes applying pulsed light to a first end of an optical fiber from an optical fault locator during a first distance test. The method includes determining an estimated distance to a fault based on the pulsed light. The method includes sending information indicative of the estimated distance to a remote device. The method also includes applying first visible light from the optical fault locator to the first end of the optical fiber to facilitate identification of the fault at a first site that is remote from the first end of the optical fiber.
    Type: Grant
    Filed: March 15, 2011
    Date of Patent: June 17, 2014
    Assignee: AT&T Intellectual Property I, L.P.
    Inventor: Bryan Smith
  • Patent number: 8750703
    Abstract: An apparatus comprising an optical transmitter, a coarse tuner coupled to the optical transmitter and having a first tuning range, a fine tuner coupled to the optical transmitter and having a second tuning range smaller than and within the first tuning range, a wavelength division demultiplexer coupled to the optical transmitter and to a plurality of optical fibers, and a detector coupled to the optical transmitter and the wavelength division demultiplexer.
    Type: Grant
    Filed: October 17, 2012
    Date of Patent: June 10, 2014
    Assignee: Futurewei Technologies, Inc.
    Inventor: Frank J. Effenberger
  • Patent number: 8736826
    Abstract: Problems of excessive fading in systems for monitoring single-mode optical fiber for physical disturbances are addressed by launching into the fiber polarized light having at least two different predetermined launch states of polarization whose respective Stokes vectors are linearly-independent of each other; downstream from the first location, receiving the light from the fiber; analyzing the received light using polarization state analyzer means having at least two different analyzer states of polarization that are characterized by respective Stokes vectors that are linearly-independent of each other and detecting the analyzed light to provide corresponding detection signals; deriving from the detection signals measures of changes in polarization transformation properties of the fiber between different times that are substantially independent of said launch states and said detection states; and, on the basis of predefined acceptable physical disturbance criteria determining whether or not the measures are i
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: May 27, 2014
    Assignee: Norscan Instruments Ltd.
    Inventors: Peter Scott Lovely, Michael James Brown
  • Publication number: 20140140691
    Abstract: A multi-function optical tool may be used for example for built-in fault detection and transceiver source characterization in local optical communication networks. A single device provides swept-heterodyne optical spectrum analysis (SHOSA) and optical frequency-domain reflectometry (OFDR) in an efficient, low-cost package by utilizing a common interrogation laser source, common optical components, and common, low-bandwidth acquisition hardware. The technology provides significant cost, space, and labor savings for network maintainers and technicians.
    Type: Application
    Filed: June 20, 2012
    Publication date: May 22, 2014
    Applicant: LUNA INNOVATIONS INCORPORATED
    Inventors: Matthew T. Reaves, Mark E. Froggatt, Evan M. Lally
  • Publication number: 20140133847
    Abstract: A wavelength shifter module and a method therein for tuning an OTDR signal to at least one pre-selected wavelength in a passive optical network (PON). The wavelength of the OTDR signal is shifted to a pre-selected wavelength to enable a remote node in the optical distribution network ODN of the PON to forward the OTDR signal to a specific drop section in the ODN. The invention also includes a remote node and a method in a remote node for receiving a wavelength shifted OTDR signal having a preselected wavelength and outputting the wavelength shifted OTDR signal to a specific drop section. Furthermore, the invention involves a method for determining the location of a fault section in a drop section.
    Type: Application
    Filed: July 1, 2011
    Publication date: May 15, 2014
    Applicant: Telefonaktiebolaget L.M. Ericsson(publ)
    Inventors: Gemma Vall-Llosera, Patryk Urban
  • Patent number: 8724102
    Abstract: A client unit and a method are provided performing fault analysis in a Passive Optical Network, PON, by using Optical Time Domain Reflectometry, OTDR. The method comprises triggering a new OTDR measurement, wherein a previous reference measurement has been made indicating an original state of the PON. The method further comprises inserting an OTDR measurement signal into a multistage splitter before a last splitter stage of the multistage splitter, and wherein the last splitter stage is of ratio 2:N; and obtaining at least one new event location based on the OTDR measurement signal. Further, the method comprises calculating a fault magnitude at a given location by subtracting an event magnitude obtained from the new OTDR measurement from the reference OTDR measurement and taking into account the number of drop links connected to the last splitter stage in the reference measurement and the new measurement. Thereby, determination of position and severity of the fault locations is enabled.
    Type: Grant
    Filed: December 22, 2010
    Date of Patent: May 13, 2014
    Assignee: Telefonaktièbolaget LM Ericsson (publ)
    Inventor: Patryk Urban
  • Patent number: 8724985
    Abstract: The present invention discloses a Wavelength Division Multiplexing Filter which can satisfy coexistence requirements of different PON systems and an optical line detecting system.
    Type: Grant
    Filed: December 21, 2009
    Date of Patent: May 13, 2014
    Assignee: ZTE Corporation
    Inventors: Jidong Xu, Dezhi Zhang
  • Publication number: 20140119724
    Abstract: An active network monitoring system for detecting an abnormality at a position between a communication office and a client includes a first monitoring module disposed on the communication office, a second monitoring module disposed on the client and an optical splitter. The first monitoring module has a first processor and a first laser diode. The second monitoring module has a second processor and a second laser diode. The first processor sends a digital signal to the first laser diode. The first laser diode modulates the digital signal into an optical signal and sends the optical signal to the second monitoring module via the optical splitter. The second laser diode converts the optical signal back to the digital signal, and sends the digital signal to the second processor to generate an identification signal of the client. The identification signal is transmitted to the communication office via the second laser diode.
    Type: Application
    Filed: July 15, 2013
    Publication date: May 1, 2014
    Inventors: CHANG-CHIA CHI, CHEN-WEN TARN, HONG-MAO LIN
  • Patent number: 8699874
    Abstract: A mechanism for adjusting or shutting off an optical signal within a network system is provided. The system may include a generating element for providing an optical signal and a bi-directional coupler for transmitting the optical signal to downstream components and fiber links and for transmitting a reflected optical signal based on the reflection characteristics of the downstream components to a converter element. The converter element converts the reflected optical signal to an electrical trigger signal that is used by a processing element to monitor the degradation or operational conditions within the network system. Based on the electrical trigger signal the processing element may adjust or shut off the optical signal at the generating element or at another element within the network system or another network system. The processing element may also send a communication signal to other elements or an operator to indicate unacceptable noise within the network system.
    Type: Grant
    Filed: February 17, 2011
    Date of Patent: April 15, 2014
    Assignee: Verizon Services Corp.
    Inventor: Dimitrios S. Kokkinos
  • Patent number: 8693865
    Abstract: A data processing device is connectable to a communication network and operable to receive data associated with an attenuation characteristic of a transmission line of a cable in a cable communication subsystem, the subsystem comprising a transmitter and/or receiver coupled to the cable. The data processing device is responsive to the received data to initiate a security procedure.
    Type: Grant
    Filed: January 11, 2010
    Date of Patent: April 8, 2014
    Assignee: Hewlett-Packard Development Company, L.P.
    Inventor: Jerry Aguren
  • Patent number: 8693866
    Abstract: A technique for detecting a fiber fault in a WDM optical access network includes launching a test signal into a fiber trunk line linking a central office (“CO”) to a remote node (“RN”) of the WDM optical access network. The test signal is generated by an optical time domain reflectometry unit to simultaneously fault test fiber access lines linking the RN to customer premises. The test signal is separated from downstream WDM signals at the RN. The test signal is power split at the RN into a plurality of access line test signals. The access line test signals are each recombined with a corresponding one of the downstream WDM signals onto a corresponding one of the fiber access lines. Test signal reflections are received at the CO from the fiber access lines as a reflection signature and analyzed to identify a location of the fiber fault.
    Type: Grant
    Filed: January 20, 2012
    Date of Patent: April 8, 2014
    Assignee: Google Inc.
    Inventors: Cedric F. Lam, Ben W. Segura, Ryohei Urata, Hong Liu
  • Patent number: 8682163
    Abstract: A detecting method, an apparatus, and a system in an Optical Distribution Network (ODN) are provided. The method includes: an Optical Line Termination (OLT) reserves a test window, and an Optical Network Unit (ONU) stops sending an uplink signal in the test window, the OLT emits a downlink test signal having a wavelength the same as that of the uplink signal in the test window, the OLT receives backward signals of the downlink test signal, in which the backward signals include a backward scattered signal and a backward reflected signal, processes the backward signals, and obtains state information of the ODN according to the backward signals. The method does not need to add other hardware, and the downlink signal is sent normally in the downlink. The implementation is low in the cost and easy in the technology.
    Type: Grant
    Filed: July 22, 2011
    Date of Patent: March 25, 2014
    Assignee: Huawei Technologies Co., Ltd.
    Inventor: Sulin Yang
  • Patent number: 8678669
    Abstract: A reconfigurable polarity detachable connector assembly includes a housing defining two accommodation channels and providing a springy protruding member at a top side, two mating simplex connectors respectively detachably mounted in the accommodation channels of the housing, a fiber optic cable fastened to the housing with two optical fiber cores thereof respectively inserted into respective calibration support rods of the mating simplex connectors, and a sliding cap slidably coupled to the housing. The sliding cap is unlocked and can be moved backwardly relative to the housing to expose the optical fiber cores of the fiber optic cable to the outside of the housing for allowing position exchange between the two mating simplex connectors after the user presses the springy protruding member.
    Type: Grant
    Filed: August 14, 2012
    Date of Patent: March 25, 2014
    Assignee: Alliance Fiber Optic Products Co., Ltd.
    Inventor: Jhih-Ping Lee
  • Patent number: 8682173
    Abstract: A particular method includes applying light pulses to an optical fiber and receiving backscattered light at a phase-sensitive optical time domain reflectometry (OTDR) device. The backscattered light includes portions of the applied light pulses that are backscattered by the optical fiber. The method also includes determining a difference between the backscattered light and a backscatter pattern associated with the optical fiber. The method also includes determining a communication signal encoded in the backscattered light based on the difference, where the communication signal is encoded in the backscattered light responsive to mechanical waves applied to the optical fiber at a location remote from the phase-sensitive OTDR device.
    Type: Grant
    Filed: October 7, 2011
    Date of Patent: March 25, 2014
    Assignee: The Boeing Company
    Inventor: Nathan D. Hiller
  • Patent number: 8660423
    Abstract: The present invention is related to a front-end circuit for an optical communication system including a laser module arranged for transmitting bursts of data signals over an optical network and a driving circuit for providing the bursts of data signals to the laser module. The front-end circuit further includes receiver means in connection with said laser module and arranged for receiving from the optical network optical echo signals. The laser module includes a laser diode arranged for transmitting the bursts of data signals. The driving circuit is arranged for setting a disabling signal for stopping the laser diode from transmitting bursts of the data signals. Fiber-related information can be extracted from the echo signals, such as distance-resolved optical fiber reflections and fiber attenuation.
    Type: Grant
    Filed: October 4, 2006
    Date of Patent: February 25, 2014
    Assignees: IMEC, Universiteit Gent (University Ghent)
    Inventors: Jan Vandewege, Bert De Mulder, Wei Chen, Xing Zhi Qui
  • Patent number: 8655167
    Abstract: Implementations of techniques and systems are disclosed for detecting a fiber fault in a point-to-point optical access network based on optical time domain reflectometry (“OTDR”) measurements. The techniques include identifying loss of service between a central office (“CO”) and a given optical network unit (“ONU”) of a plurality of ONUs. In response to the identifying the loss of service, configuring a test signal distribution unit to optically couple an OTDR unit to a selected subset of the point-to-point fiber links which includes the given ONU. An optical test signal is launched from the OTDR unit into the selected subset of the point-to-point fiber links via the test signal distribution unit. Test signal reflections are received from each of the point-to-point fiber links within the selected subset as a reflection signature, which is analyzed to identify a location of the fiber fault.
    Type: Grant
    Filed: January 5, 2011
    Date of Patent: February 18, 2014
    Assignee: Google Inc.
    Inventors: Cedric F. Lam, James F. Kelly, Austin B. Schuh
  • Publication number: 20140037285
    Abstract: An OTDR device and method for characterizing one or more events in an optical fiber link are provided. A plurality of light acquisitions is performed. For each light acquisition, test light pulses are propagated in the optical fiber link and the corresponding return light signals from the optical fiber link are detected. The light acquisitions are performed under different acquisition conditions, for example using different pulsewidths or wavelengths. Parameters characterizing the event are derived using the detected return signal from at least two of the plurality of light acquisitions.
    Type: Application
    Filed: October 2, 2013
    Publication date: February 6, 2014
    Applicant: EXFO INC.
    Inventors: Stéphane Perron, Michel Leblanc
  • Patent number: 8634713
    Abstract: A method of monitoring (200) an optical fiber comprises modulating (210) an optical signal with a traffic signal; modulating (220) the optical signal with an incoherent optical frequency domain reflectometry, IOFDR, test signal; transmitting (230) the doubly modulated optical signal onto an optical fiber at a first end of the fiber; detecting (240) scattered radiation output from the first end of the fiber; and analyzing (250) the detected scattered radiation using incoherent optical frequency domain reflectometry to determine a distance to a break in the optical fiber. Apparatus suitable for carrying out the method is also described, as well as an optical communications network employing the method.
    Type: Grant
    Filed: August 29, 2008
    Date of Patent: January 21, 2014
    Assignee: Telefonaktiebolaget LM Ericsson (publ)
    Inventors: Carlo Campanelli, Roberto Magri
  • Publication number: 20140003806
    Abstract: An arrangement in a node in a WDM-PON and a method therein for supervision of the WDM-PON are provided. The arrangement comprises X splitters of splitting ratio 1:Y, each splitter having one input and Y outputs such that X*Y equals N, wherein X, Y, N are integers. The one input of each of the X splitters is configured to receive an Optical Time Domain Reflectometry, OTDR, signal and to split the received OTDR signal into Y OTDR sub-signals such that a total of N OTDR sub-signals are outputted from the X splitters. The arrangement further comprises an N*N Arrayed Waveguide Grating, AWG, and a first filter configured to mix a feeder signal comprising data communication from an Optical Line Termination, OLT, with one of the N OTDR sub-signals. One input of the AWG is configured to receive the mix of the feeder signal and the one OTDR sub-signal, and the remaining N-inputs of the AWG are each configured to receive a respective one of the N-remaining OTDR sub-signals.
    Type: Application
    Filed: March 21, 2011
    Publication date: January 2, 2014
    Applicant: TELEFONAKTIEBOLAGET L M ERICSSON (PUBL)
    Inventors: Patryk Urban, Min Cen
  • Patent number: 8594496
    Abstract: An apparatus comprising an optical transmitter, a coarse tuner coupled to the optical transmitter and having a first tuning range, a fine tuner coupled to the optical transmitter and having a second tuning range smaller than and within the first tuning range, a wavelength division demultiplexer coupled to the optical transmitter and to a plurality of optical fibers, and a detector coupled to the optical transmitter and the wavelength division demultiplexer. A network component comprising at least one processor configured to implement a method comprising detecting an Optical Time Domain Reflectometry (OTDR) signal spectrum that has a modulated pattern, and detecting a reflected OTDR signal spectrum that has a shifted modulated pattern comprising a frequency shift with respect to the OTDR signal spectrum and a time shift proportional to the frequency shift.
    Type: Grant
    Filed: November 13, 2009
    Date of Patent: November 26, 2013
    Assignee: Futurewei Technologies, Inc.
    Inventor: Frank J. Effenberger
  • Patent number: 8588606
    Abstract: A network monitoring module for deployment in a branched optical network at a split location where the network splits into a plurality of branches, the network monitoring module is disclosed, comprising an array of transmitters for generating optical test signals, an output of each transmitter in the array being optically connected to a respective branch, a detector for receiving a remotely generated optical trigger signal which identifies a particular one of the transmitters, and a CMOS circuit for selectively triggering the transmitter identified in the optical trigger signal to transmit an optical test signal into the branch connected to that transmitter.
    Type: Grant
    Filed: June 28, 2006
    Date of Patent: November 19, 2013
    Assignee: Tyco Electronics Raychem NV
    Inventors: Jan Watte, Gerry Branders, Juan Tomas Arias, Bart Volckaerts, Hugo Thienpont, Christof Debaes
  • Publication number: 20130272694
    Abstract: A small form factor pluggable (SFP) device has an embedded optical time domain reflectometer (OTDR) for detecting anomalies along an optical fiber. The SFP device has a plurality of optical subassemblies (OSAs) that are used to transmit an optical data signal at a first wavelength, transmit an optical OTDR signal at a second wavelength, and receive an optical data signal at a third wavelength. The OTDR signal is effectively isolated from the data signals based on wavelength, and samples of returns of the OTDR signal are analyzed to detect at least one anomaly along the optical fiber.
    Type: Application
    Filed: March 6, 2013
    Publication date: October 17, 2013
    Inventor: Leif J. Sandstrom
  • Patent number: 8509624
    Abstract: In one embodiment, an apparatus comprising an optical transmitter, having an optical transmitter portion and an electrical transmitter portion, and configured to convert an electrical signal to an optical signal, and transmit the optical signal; an optical receiver, having an optical receiver portion and an electrical receiver portion, configured to receive an optical signal and convert the optical signal to an electrical signal; a passive power controller configured to passively detect whether or not a cable is coupled with the optical transmitter and, if not, to place at least the optical transmitter portion in a sleep mode.
    Type: Grant
    Filed: November 28, 2007
    Date of Patent: August 13, 2013
    Assignee: Cisco Technology, Inc.
    Inventor: Farrokh Mattahedin
  • Patent number: 8509613
    Abstract: In optical communication systems, an optical signal which is modulated with a data signal is transmitted from an optical transmitter, and is launched into a fiber-optic transmission link. The present invention provides a method and an apparatus for the measurement of the distribution of the reflectivity along an optical transmission line implemented by using the signal processing based on the cross-correlation function between the data signal with which the optical transmitter is modulated and the back-reflected signal returned to the optical transmitter to provide the in-service monitoring of the fiber-optic transmission link.
    Type: Grant
    Filed: April 14, 2008
    Date of Patent: August 13, 2013
    Assignee: Korea Advanced Institute of Science and Technology
    Inventors: Yun Chur Chung, Yuichi Takushima
  • Publication number: 20130202290
    Abstract: An OLT operable in a PON and structured to perform OTDR measurements. The OLT comprises an electrical module for generating continuous downstream signals and processing received upstream burst signals according to a communication protocol of the PON; an optical module for transmitting continuous optical signals over a first wavelength, receiving optical upstream burst signals over a second wavelength, and transmitting optical upstream burst signals over a third wavelength, wherein the optical module further includes an ONU traffic processing module being electrically coupled to the optical module and the electrical module, wherein the ONU traffic processing module is configured to emulate one of a plurality of ONUs of the PON, to generate an analysis pattern to be transmitted as an optical upstream burst signal over a third wavelength, and analyze an analysis pattern received in an optical upstream burst signal for the purpose of performing the OTDR measurements.
    Type: Application
    Filed: May 23, 2012
    Publication date: August 8, 2013
    Applicant: Broadcom Corporation
    Inventor: Amiad DVIR