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| Number | Title | Issue Date |
| 8135275 | Measuring chromatic dispersion in an optical wavelength channel of an optical fiber link Two intensity modulated test signals are generated with precise frequency offset from a single laser source, and multiplexed into a combined test signal. The two modulated signals are demultiplexed at a receiver using a fixed periodic optical filter with complementa... | 03/13/2012 |
| 8126326 | Method and device for complex analysis of optical spectrums This invention relates to a device and associated process capable of obtaining the optical spectrum phase of an optical signal or test signal to be analyzed using techniques for heterodyning between two monochromatic spectral components simultaneously extracted from... | 02/28/2012 |
| 8111986 | Testing of transmitters for communication links by software simulation of reference channel and/or reference receiver A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter... | 02/07/2012 |
| 8068729 | Network testing apparatus, network testing method and recording medium thereof This G-PON network testing apparatus composes a network by connecting between an OLT, ONU or ONT by a optical fiber. This testing apparatus stores testing items and code numbers in a storing section by correlating them from each other. It obtains data receiving time... | 11/29/2011 |
| 8050555 | Optical phase modulator with monitoring structure The invention relates to an optical waveguide device that includes a waveguide phase modulator (WPM). A waveguide monitoring structure is coupled optically in parallel with the WPM so as to form a Mach-Zehnder interferometer therewith for producing monitor light ind... | 11/01/2011 |
| 8027584 | Sensing a disturbance The present invention relates to a system for sensing of a disturbance on an optical link. Data traffic from an optical source with a short coherence length is transmitted along the link to a receiver station on one or more of a plurality of time-division-multiplexe... | 09/27/2011 |
| 8014668 | Method and system for distributed measurement and compensation of chromatic dispersion in an optical network A method and apparatus for distributed measurement of chromatic dispersion in an optical network is disclosed. The network comprises optical switching nodes interconnected by optical links. An optical link may comprise multiple spans, each span ending in a transport... | 09/06/2011 |
| 8009981 | Testing of transmitters for communication links by software simulation of reference channel and/or reference receiver A transmitter for a communications link is tested by using a (software) simulation of a reference channel and/or a reference receiver to test the transmitter. In one embodiment for optical fiber communications links, a data test pattern is applied to the transmitter... | 08/30/2011 |
| 8005358 | System and method for suppressing beat noise in line monitoring equipment A system and method for suppressing beat noise in line monitoring equipment. A wavelength dither generator wavelength modulates a carrier wavelength of a test signal laser transmitter. A test code is modulated on the dithered carrier wavelength to provide a test sig... | 08/23/2011 |
| 7920787 | Method for detecting a check-back signal in an optical transmission system The invention relates to a method for detecting a check-back signal in a transmission system for optical signals. According to said method, a constant proportion of the output in a defined frequency range of the check-back signal is concentrated in a narrow-band spe... | 04/05/2011 |
| RE42095 | Method for transferring utility optical signals and optical-line network The control of the transmission of useful optical signals on different line paths of an optical transmission device is accomplished via at least one of the following features: using signal sources and signal sinks, the useful optical signals are coupled into the lin... | 02/01/2011 |
| 7848645 | Identifying or locating waveguides The location or identification of a waveguide is determined, in particular where a disturbance is applied to the optical waveguide. This is achieved by: (a) monitoring the waveguide at a first location to sense a disturbance along the waveguide; (b) causing a distur... | 12/07/2010 |
| 7734173 | Error detection and recovery of an optical network element Error detection and recovery of an optical network element are described herein. In one embodiment, an exemplary process includes, but is not limited to, transmitting from a transmitting module of the optical network element a first packet of data to a receiving mod... | 06/08/2010 |
| 7725026 | Phase responsive optical fiber sensor The location of a physical disturbance along an optical waveguide is determined by measuring different propagation times for the resulting phase variation to propagate to phase responsive receivers at ends of bidirectional signal paths. Each receiver can have a coup... | 05/25/2010 |
| 7725025 | Switchable fiber termination An apparatus, system and method are provided for a switchable fiber termination (SFT) incorporated into an optical network device that responds to a test signal received via an optical network carrying data. The test signal may be a part of a multiplexed signal carr... | 05/25/2010 |
| 7613393 | Transceiver module and integrated circuit with dual eye openers and integrated loopback and bit error rate testing A transceiver module having integrated eye diagram opening functionality for reducing jitter is described. The transceiver module may include a transmitter eye opener and a receiver eye opener integrated in single circuit. The transceiver module may also include ser... | 11/03/2009 |
| 7599618 | Method and apparatus for self-testing of test equipment A method of self-testing includes transmitting a plurality of self-test signals and receiving the plurality of self-test signals. In addition, the method includes storing the received self-test signal in a first database; and comparing the received self-test signal ... | 10/06/2009 |
| 7529481 | Linear optical sampling methods and apparatus An optical data signal can be sampled by linearly combining the optical data signal with optical sampling pulses, and delivering the combination to first and second balanced detectors. The optical data signal and the optical sampling pulse are configured to have a f... | 05/05/2009 |
| 7486888 | Method of identifying infrared transmission head function A transmission method for identifying infrared transmission head is provided. The infrared transmission head is coupled to an infrared controller. The infrared controller is set to a test circuit mode. The infrared controller is programmed according to the test tran... | 02/03/2009 |
| 7447431 | Optical communications processing system, components and operating method thereof An optical information transmission system comprises a plurality of optical transmitters and receivers, each having ports for exchangeable waveguides. Each transmitter has an input for receiving an enable signal assigned to it, and is adapted to generate or not to g... | 11/04/2008 |
| 7440700 | Apparatus for testing performance of optical transceiver Provided is an apparatus for testing the performance of an optical transceiver by referencing various performance clocks provided by an OTU2 signal connection transceiver and an STM-64/OC-192 signal. The apparatus for testing performance of an optical transceiver in... | 10/21/2008 |
| 7418203 | Diagnosis method for standby system of optical ring network An object of the invention is to provide a diagnosis method for standby systems in an optical ring network having a redundant configuration, which can confirm normal states of standby systems in all optical transmission apparatuses on the network, even during operat... | 08/26/2008 |
| 7415536 | Address query response method, program, and apparatus, and address notification method, program, and apparatus Upon reception of a query about the address of a server from a client, a DNS server sends a query about the address of that server to an external DNS server. The DNS server checks based on the address obtained from the external DNS server if connection to the server... | 08/19/2008 |
| 7412165 | DCC loop plug Systems and methods are disclosed for testing the functionality of a synchronous optical network having a data communication channel therein. The system includes a testing device connected to a network node within the synchronous optical network and a data communica... | 08/12/2008 |
| 7394980 | Systems and methods for testing a circuit in a communication network A channel transponder tests a circuit in a communication network. The channel transponder includes short reach receiver circuitry, long reach transmitter circuitry, long reach receiver circuitry, generator circuitry, short reach transmitter circuitry, and a connecto... | 07/01/2008 |
| 7391720 | Local span mesh restoration (LSMR) An embodiment of the invention provides a method and apparatus for restoring a connection in a network. The connection is typically a sub network connection (SNC). In an embodiment, a failed line in a link connecting a first node and a second node is detected, where... | 06/24/2008 |
| 7389044 | Method and system for providing a signature signal in an optical network in the event of loss of a client An optical network including multiple nodes is subject to intermittent faults that may raise alarms in the system. The invention focuses on an optical network based on the Any rate architecture. A single fault such as a client failure at a node in such a network can... | 06/17/2008 |
| 7386234 | Apparatus for remotely determining fault of subscriber terminals and method thereof An apparatus for remotely determining a fault of subscriber terminals and a method thereof, and more specifically, an apparatus by which in a passive optical network (PON) system, a central office determines a remote fault of subscriber terminals, and a method there... | 06/10/2008 |
| 7369763 | Apparatus and method for monitoring an optical transmission line An apparatus and a method for monitoring an optical transmission line. An optical pilot signal of a predetermined duration is transmitted along said optical transmission line and a return signal is sent back from a signal returner along the same transmission line co... | 05/06/2008 |
| 7366988 | Method and apparatus for converting a network description into a computer program for disambiguating transmit-by-exception telemetry from a multi-path, multi-tier network A method for making an apparatus for disambiguating telemetry sent by exception over a multi-path, multi-tier communications network having a plurality of telemetry source nodes producing telemetry data elements, a plurality of linked relay nodes, and one destinatio... | 04/29/2008 |
| 7355982 | Subscriber line terminal device and loopback test method The present invention provides a subscriber line terminal device, which enables identification of the cause of abnormality when abnormality is detected in remote monitoring of a subscriber line terminating device connected to the terminal device via an optical fiber... | 04/08/2008 |
| 7343094 | Transmission characteristics evaluation system and pseudo transmission path apparatus thereof A transmission characteristics evaluation system can measure the dispersion tolerance and the insertion loss gradient tolerance at a high precision with reduced number of working steps for the measurement in evaluating the transmission characteristics of an optical ... | 03/11/2008 |
| 7305183 | Measurement of polarization dependent loss in an optical transmission system A method and system enables measurement of polarization dependent loss (PDL) in an optical communications system including a plurality of cascaded optical components. An optical signal having a predetermined initial polarization state is launched into the optical co... | 12/04/2007 |
| 7295776 | Optical LAN device An ring type optical LAN device includes a master node and a plurality of slave nodes that are interconnected by an optical fiber cable. A plurality of optical bypass transmission lines are provided in correspondence with each one of the slave nodes. Each of the opt... | 11/13/2007 |
| 7289729 | Optoelectronic marker for determining ownership of fiber optic cable A passive optical arrangement for indicating the presence of a change in ownership along a fiber optic cable span uses an attenuation unit at a splice location that will severely attenuate an optical signal propagating along the span at a predetermined “marker” ... | 10/30/2007 |
| 7274872 | System and method for subcarrier modulation as supervisory channel An apparatus and method for processing a supervisory signal for optical network applications. The apparatus includes a subcarrier transmission system configured to receive a first supervisory signal and output a second supervisory signal, and an electrical-to-optica... | 09/25/2007 |
| 7263286 | Fast testing system for optical transceiver and testing method thereof The present invention provides a fast testing system and method for optical transceiver, which integrates multiple testing machines in the testing environment for the optical transceiver, so that the user can employ the testing system for optical transceiver for rap... | 08/28/2007 |
| 7248797 | Transmitter-receiver device and a communication system The invention concerns a transmitter-receiver device (A, B) which comprises a receiver unit (RXA) arranged to receive light and optical signals from a transmitter unit (TXA) arranged to transmit light and optical signals. The device also comprises a supervising unit... | 07/24/2007 |
| 7242862 | Network diagnostic tool for an optical transport network A network diagnostic system is provided for an optical transport network having a plurality of network elements. The network diagnostic system includes at least one network element having a network diagnostic operation integrated therein and operable to perform the ... | 07/10/2007 |
| 7231145 | Processing of optical performance data in an optical wavelength division multiplexed communication system Optical performance measurements are taken in an optical network and displayed in a form that allows an operator to enter fault information related to the measurements, or to automatically generate fault alarms to the operator, based on processing of the measurement... | 06/12/2007 |
