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| Number | Title | Issue Date |
| 8050554 | Fault localization apparatus for optical line using subcarrier multiplexing (SCM) monitoring signal and method thereof Provided are a fault localization apparatus based on an optical communication network and a method thereof. In the fault localization apparatus according to the present invention, a downstream light source is used as a monitoring optical signal instead of using an a... | 11/01/2011 |
| 7885539 | Method for detecting and localizing faults in an optical transmission path, and optical transmission system A method for detecting and locating faults in an optical transmission path, and to an optical transmission system having such a functionality, is provided. By measuring the temporal change in the state of polarization SOP, external influences on a glass fiber cable ... | 02/08/2011 |
| 7433595 | Optical signal transmission apparatus and optical signal transmission method The present invention provides an optical signal transmission apparatus for carrying out bi-directional light transmission. The optical signal transmission apparatus includes: a light sending module, for sending an optical main-signal having at least one data width,... | 10/07/2008 |
| 7426347 | Shared optical performance monitoring An apparatus for shared optical performance monitoring (OPM) is provided. A wavelength sensitive device receives light at an input port and routes it wavelength selectively to a set of output ports. To perform optical performance monitoring on the output ports, a mo... | 09/16/2008 |
| 7400829 | Transmission apparatus and path selection method of a transmission apparatus A transmission apparatus that receives an optical signal by selecting any one of a plurality of provided optical signal transmission paths through protection control is configured to include a plurality of optical signal outputting sections that output the optical s... | 07/15/2008 |
| 7394989 | Signal transmission device A transmission unit of a signal transmission device includes: a transmission-side detection unit that detects image information from an inputted electrical signal; a receiving unit that receives, from a reception unit, a status signal representing an arrival status ... | 07/01/2008 |
| 7352966 | Method and apparatus for capacity-efficient restoration in an optical communication system A method and system provide capacity-efficient restoration within an optical fiber communication system. The system includes a plurality of nodes each interconnected by optical fibers. Each optical fiber connection between nodes includes at least three channel group... | 04/01/2008 |
| 7312435 | Determination of a physical state of an optical device The present invention relates to a determination of a physical state of an optical device by measuring a response signal. At least two subsequent measurements are executed. Therefore, a first optical signal is transmitted to the optical device, wherein a firs... | 12/25/2007 |
| 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 |
| 7283739 | Multiple subnets in an optical ring network and method An optical network includes an optical ring and at least three subnets. Each subnet includes a plurality of add/drop nodes coupled to the optical ring. The add/drop nodes are operable to passively add a first traffic stream in a first direction on the optical ring a... | 10/16/2007 |
| 7283740 | Optical ring network with optical subnets and method An optical network includes a plurality of subnets. The subnets each include a plurality of add/drop nodes coupled to the optical ring and operable to passively add and drop traffic to and from the optical ring. The network further includes a plurality of gateway no... | 10/16/2007 |
| 7260324 | Automatic optical power management in optical communications system An automatic optical power management system for use with an optical communications system includes a light source residing in a first circuit pack and adapted to emit light at a nominal power level only absent receipt of an indicator signifying a loss of signal res... | 08/21/2007 |
| 7245421 | Wavelength-division multiplexing optical communication system In a WDM optical communication system in which an optical lossy medium, optical amplifiers and Raman amplifiers for compensating for loss in the optical lossy medium are cascade-connected, means are provided for acquiring the state of use of a Raman amplifier, at a ... | 07/17/2007 |
| 7242860 | Optical protection switching using 2 by 2 switching functions A network is protected against interruption of service while one or more faulty switches or optical fiber transmission lines are repaired or replaced, by an interconnecting configuration of small N×N optical input/output switches, where N is 2 or greater than 2. Th... | 07/10/2007 |
| 7233739 | Optical bit stream reader system An all optical fiber bit stream reader system for examining the data contents of an optical fiber involving the conversion of a temporal timing signal into a spatially located signal is provided. The invention generally comprises generating and detecting a signal in... | 06/19/2007 |
| 7215464 | Optical amplifier Optical amplifier which can eliminate the need for an optical detection section before an external attenuating medium, can prevent SN degradation, and can reduce power required for pumping light. An attenuation amount detection section detects an amount of signal li... | 05/08/2007 |
| 7209664 | Frequency agile transmitter and receiver architecture for DWDM systems A frequency-agile optical transceiver includes a shared local oscillator (LO), a coherent optical receiver and an optical transmitter. The LO operates to generate a respective LO optical signal having a predetermined LO wavelength. The coherent optical receiver is o... | 04/24/2007 |
| 7206478 | Apparatus and method for monitoring optical network An apparatus for monitoring fiber-fault in an optical networks, such as a passive optical networks, suitable for monitoring at least one fiber path in connection. The apparatus includes at least one fiber grating, having an individual central wavelength and coupling... | 04/17/2007 |
| 7187860 | Method and apparatus for detecting localized polarization dependent anomalies on optical transmission lines The position and amount of localized polarization dependent anomalies such as polarization mode dispersion and/or polarization dependent loss may be measured by applying a polarization modulated probe signal to an optical transmission line. The polarization modulate... | 03/06/2007 |
| 7184660 | Method and system for monitoring performance of optical network The invention describes methods and systems for monitoring the performance of an optical network by marking a group of optical signals with a set of identification tags which are unique to network characteristics. In the preferred embodiments, fiber identification (... | 02/27/2007 |
| 7181137 | Subband spectrum analysis for optical multiplex section protection The spectrum of a received WDM band or subband is analyzed to detect failure of, e.g., fiber or amplifiers along a line. In one implementation, measurements are taken within the optical spectrum at locations of expected data-carrying optical signals and at two locat... | 02/20/2007 |
| 7174488 | Echo canceler-based mechanism for performing and reporting fault diagnostic testing of repeatered telecommunication line A repeater-installed fault location mechanism conducts parametric measurements on a segment of wireline to which the repeater is connected, and adjusts taps of an echo cancellation operator in the repeater transceiver equipment, in accordance with the response of th... | 02/06/2007 |
| 7174108 | Transmission device and repeater A transmission system is provided that recognizes occurrence of a fault efficiently so that the workability and quality of service can be improved. An optical amplifier part amplifies an optical main signal. A fault occurrence recognizing part detects a pump light u... | 02/06/2007 |
| 7153034 | Method of constructing an optical transmission line and an optical transmission line The present invention discloses an optical transmission line constructing method comprising the steps of connecting a plurality of optical fibers differing from each other in terms of a transmission characteristic; making inspection light incident on an entrance end... | 12/26/2006 |
| 7142736 | Distributed fiber sensor with interference detection and polarization state management Polarization effects are managed to provide differential timing information for localizing disturbances affecting two or more counter-propagating light signals on one or more optical waveguides passing through a detection zone. Activity can be localized to a point f... | 11/28/2006 |
| 7139069 | Methods and apparatus for detecting a faulty component location along an optical path in an optical network A multi-stage method and apparatus for determining a faulty component location along an optical path through an optical fiber in an optical network are disclosed. A total power of the optical fiber, and a total wavelength power as a sum of powers of the individual w... | 11/21/2006 |
| 7106965 | Wavelength division multiplex transmission system and communication device A wavelength division multiplex transmission system with substantial functions for avoidance of defects is provided. The system comprises an optical transmission device and an optical receiving device. The optical transmission device comprises an operating-system op... | 09/12/2006 |
| 7099581 | OTDR arrangement for detecting faults in an optical transmission system on a span by span basis A method is provided for using optical time-domain reflectometry (OTDR) with a bi-directional optical transmission system that includes a plurality of terminals interconnected by first and second unidirectional optical transmission paths having at least one repeater... | 08/29/2006 |
| 7068947 | Multi wavelength communication apparatus A communication apparatus for use with a light source providing a light beam having a wavelength λ. The apparatus comprises at least one optical modulator adapted to modulate the light beam to a modulated light signal which comprises at least two additional spectra... | 06/27/2006 |
| 7055068 | Method for validating operation of a fibre link A method for validating operation of a fiber link when the fiber link is initialized includes the steps of entering a trial link up state upon receiving a command to initialize the fiber link so that normal commands to other devices within the fiber channel loop are... | 05/30/2006 |
| 7054558 | Method for traffic protection in WDM fiber optic transport networks A method for the protection of fiber optic ring-shaped transport networks, the networks including network elements connected by spans, optical paths being installed between the network elements, the method including the steps of providing each network element with i... | 05/30/2006 |
| 7054560 | Configuration for detecting optical signals of a planar optical circuit A configuration for detecting optical signals of at least one optical channel of a planar optical circuit. At least one deflection device is provided, which couples the optical signals of at least one optical channel at least partly out of the plane of the circuit, ... | 05/30/2006 |
| 7035544 | Identification of related communications channels in a wavelength division multiplexed optical network Channels in an optical network that carry optical signals are evaluated using signal characteristics and suitable channels are compared to identify the channels that represent a single conversation using matching criteria. In another aspect, only channels that carry... | 04/25/2006 |
| 7031606 | Method and system for monitoring performance of optical network The invention describes methods and systems for monitoring the performance of an optical network by introducing a fiber identification (FID) tag and/or bundle identification (BID) tag which are unique to the fiber section and to the bundle of fibers respectively. Th... | 04/18/2006 |
| 7031049 | Loss point detecting method and distributed raman amplifier applying the same Power of scattered light separated from an optical transmission path is monitored, part of the excitation light is separated and power thereof is monitored, power of reflected light which passes in a direction opposite to a direction in which signal light passes thr... | 04/18/2006 |
| 7025461 | Interactive display system having a digital micromirror imaging device A display system includes a waveguide optical panel having an inlet face and an opposite outlet face. A projector cooperates with a digital imaging device, e.g. a digital micromirror imaging device, for projecting an image through the panel for display on the outlet... | 04/11/2006 |
| 7020393 | Method of synchronizing parallel optical links between communications components The present invention is directed to a method of synchronizing data transmission through optical links between first and second communications components. Each of the first and second communications components include an optical laser for transmitting and receiving ... | 03/28/2006 |
| 7013059 | Methods for protecting data signals which are being transmitted via optical conductors Methods for protecting data signals which are being transmitted via optical conductors are disclosed. At least one operational optical conductor set that is connected at both ends to optical switching devices is provided for the purpose of bi-directional transmissio... | 03/14/2006 |
| 6975812 | Optical communication device The detection light reflection function is given to PLC type LD, PD or LD/PD modules having light guides and optoelectronic chips (LD, LED, PD or APD) by forming a grating on the light guides which selectively reflects only the detection light. ... | 12/13/2005 |
| 6968130 | System and method for fully utilizing available optical transmission spectrum in optical networks A system and method for facilitating full utilization of an ultra-wide optical communication band spanning the useable band of the optical transmission spectrum, and providing appropriate protection strategies on the same mesh/ring network for all channels within th... | 11/22/2005 |
