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| Number | Title | Issue Date |
| 8175454 | Fault locator for long haul transmission system A system and methods include generating an optical time domain reflectrometry signal; transmitting the optical time domain reflectrometry signal on a first fiber path in a first direction through at least one optical amplifier; receiving a reflection of the optical ... | 05/08/2012 |
| 8095003 | Fiber optic testing system and method incorporating geolocation information Systems are provided for gathering location data pertaining to a fiber optic network. One system includes a sensor, a geolocation system, a processor in communication with the sensor and the geolocation system, and a user control panel. The sensor is configured to r... | 01/10/2012 |
| 8050556 | In-band optical frequency division reflectometry 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 recei... | 11/01/2011 |
| 7869708 | COTDR arrangement with swept frequency pulse generator for an optical transmission system A method and apparatus is provided for obtaining status information from a given location along an optical transmission path. The method begins by generating a cw probe signal having a prescribed frequency that is swept over a prescribed frequency range. The cw prob... | 01/11/2011 |
| 7853144 | Optical bench fiber optic transmitter The subassembly includes a laser for emitting signals towards fibers to be monitored, a passive alignment carrier, a photodetector for monitoring reflected laser signals from the fibers and for monitoring laser output power, and an optical fiber. The laser is dispos... | 12/14/2010 |
| 7769291 | Optical communication network and component therefore A component for an optical communication network comprises a source (6) for an optical communication signal, an output port (11) for outputting the optical communication signal on an optical transmitting fiber (1), a light sensor (14; 15)... | 08/03/2010 |
| 7555213 | Preventing damage to optical components from optical time domain reflectometers There is provided in a telecommunications network comprising an optical fiber cable, and an optical component connected to a first point of the optical fiber cable, with an optical time domain reflectometer (OTDR) connected to a second point of the optical fiber cab... | 06/30/2009 |
| 7536102 | Method and apparatus for fiber optic fault locating and mapping In accordance with the teachings of the present invention, a method and apparatus is presented for troubleshooting a fiber-optic cable. A fiber-optic, cable-troubleshooting system includes an integrated Optical Time Domain Reflectometer (OTDR) for generating an opti... | 05/19/2009 |
| 7428382 | System and method for performing in-service fiber optic network certification A system and method for performing an in-service optical time domain reflectometry (OTDR) and/or insertion loss (IL) measurement(s) using the same wavelength as the data traffic for point-to-point or point-to-multipoint optical fiber networks. The OTDR or IL session... | 09/23/2008 |
| 7415206 | Arrangement for characterizing and reducing multi-path interference (MPI) and/or optical return loss (ORL) in optical transmission links having multiple discrete reflection sources In an optical transmission link having discrete optical reflection sources that cause multi path interference (MPI) and optical return loss (ORL), a method determines how to reduce to beneath a predetermined threshold, a predetermined phenomenon (MPI or ORL or a com... | 08/19/2008 |
| 7359637 | Self-healing passive optical network A self-healing passive optical network is disclosed. The network includes a central office and a remote node connected to the central office through a main optical fiber. The remote node transmits one portion of power of the upstream optical signal, which has been i... | 04/15/2008 |
| 7340170 | Wavelength-division multiplexed self-healing passive optical network A wavelength-division multiplexed self-healing passive optical network is capable of detecting cut-off and deterioration of feeder fiber and distribution fiber and restoring a network with a star structure. The network includes a central office, a remote node, and a... | 03/04/2008 |
| 7340133 | Configurable dispersion compensation trimmer The invention pertains to optical fiber transmission systems, and is particularly relevant to transmission of large volumes of data over long distances at high rates. An improved apparatus achieving precise dispersion compensation in a fiber span is disclosed. In pa... | 03/04/2008 |
| 7336898 | Fibre optic communications network A security system for controlling access to an enclosed conduit along which runs fiber optic cable, the conduit having a cover for access to the cable, the system having a communications receiver and a modulator responsive to an output of the receiver for coupling n... | 02/26/2008 |
| 7327771 | WDM-PON system with optical wavelength alignment function A PLC-based wavelength-tunable WDM-PON system with an optical wavelength alignment function, the WDM-PON system comprises: a PLC platform formed on a silicon substrate; a semiconductor chip comprising an active region generating light and a passive region located in... | 02/05/2008 |
| 7321727 | Method for network commissioning using amplified spontaneous emission (ASE) sources This invention provides a method for commissioning an optical network using internal Automatic Spontaneous Emission (ASE) light inherently present in the optical network as a light source (the ASE light source) for measuring losses inside and between nodes in the ne... | 01/22/2008 |
| 7319816 | Detection of disconnection in an optical transmission line An optical transmitter transmits a light which alternately exhibits a spectrum line width wider than a Brillouin bandwidth and a spectrum line width narrower than the Brillouin bandwidth. The transmitted light is provided to an optical transmission line so that the ... | 01/15/2008 |
| 7283743 | Systems and methods for active monitoring and management of fiber links Systems and methods for actively monitoring and managing the integrity of an optical fiber communications link. The optical fiber link integrity is monitored to guard against intrusions and other security breaches. In one embodiment, a local and a remote active moni... | 10/16/2007 |
| 7184670 | Telemetry system and method for acoustic arrays A telemetry system includes a plurality of acoustic sensors for receiving acoustic information and generating analog signals based on the received acoustic information. A first plurality of subsystems is coupled to at least a subset of the plurality of acoustic sens... | 02/27/2007 |
| 7184628 | Method of manufacturing an optical module with diffraction grating An optical module comprising a column-shaped mounting member having a through hole extending along the central axis thereof and having a mounting surface formed by incising a part of the mounting member so as to expose the interior surface of the through hole; and a... | 02/27/2007 |
| 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 |
| 7171116 | Provisionable keep-alive signal for physical-layer protection of an optical network A dual-output Mach-Zehnder modulator (MZM2) and configurations of optical transmitters based on the MZM2 which obviate the optical splitter that is typically used to provide keep-alive functionality in redundantly-connected, protected optical networks, SONET add-dro... | 01/30/2007 |
| 7171322 | Algorithm for estimation of multiple faults on a transmission line or waveguide An algorithm is provided for a frequency domain reflectometer which takes into account both attenuation per unit length of transmission line and phase shift per unit length of transmission line in a modified Inverse Fourier Transform that converts a frequency domain... | 01/30/2007 |
| 7167236 | Method for automatic testing of optical fibres in multibranch networks A method of testing optical fibers in which a reference trace is generated and the power levels of backscattered optical signals are measured are stored according to distance, thereby identifying fiber section ends according to the attenuation in power levels. If a ... | 01/23/2007 |
| 7164858 | Optical transmission system and optical transmitter used therein An optical transmission system is provided with a broadband optical transmitter including a broadband light source and a broadband optical modulator, an optical filter, an optical modulator, a transmission path, a wavelength router, and an optical receiver. The broa... | 01/16/2007 |
| 7113660 | Fiber optic damage detection system for composite pressure vessels An optical fiber is wound onto an exterior surface of a composite structure in a two-dimensional pattern and adhered thereto to detect damage to the structure caused by impacts to or handling of the composite structure. ... | 09/26/2006 |
| 7106974 | Low-cost WDM source with an incoherent light injected fabry-perot laser diode The present invention discloses a low-cost light source for optical transmission systems and optical networks based on wavelength-division multiplexing (WDM) technology. A light source in accordance with the present invention is implemented by externally injecting a... | 09/12/2006 |
| 7107353 | Systems and methods for determining a fundamental route between central offices in a telecommunications network The invention is systems and methods for determining a fundamental route between central offices in a telecommunications network. The invention receives a “request for service” as location names or location information associated with the two selected locations.... | 09/12/2006 |
| 7092630 | Open fiber control for optical transceivers The present invention implements open fiber control in an optical transceiver. During normal operation, the transceiver transmits signals through a connection to an optical network. When the connection is intact, the total power transmitted can be greater than the e... | 08/15/2006 |
| 7079765 | Optical wavelength division multiplex signal monitoring apparatus An optical signal quality degradation monitoring apparatus for monitoring an optical wavelength division multiplex signal is implemented in a small size. To monitor the optical signal quality degradation in the optical wavelength division multiplex signal by a confi... | 07/18/2006 |
| 7042559 | Fault location apparatus and procedures in CWDM business applications using wavelength selective OTDR A method for verifying fiber connections and diagnosing loss of light or loss of signal conditions in a WDM optical system. The method utilizes an optical time domain reflectometer (OTDR) having user-selectable wavelengths to shoot OTDR traces at a specified wavelen... | 05/09/2006 |
| 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 |
| 7011453 | Method for determining fiber optic fault location Methods and apparatus for detecting degradation of a fiber optic connector. In a preferred embodiment, the method includes transmitting a optical pulse in a first direction along the fiber optic cable such that a first portion of the optical pulse is either absorbed... | 03/14/2006 |
| 7002735 | Method for detecting disengagement of an optical fiber, an optical fiber amplifier, and a unit of an optical fiber amplifier with a transmission optical fiber A method for detecting a connector disengagement of an optical fiber amplifier and a transmission optical fiber connected thereto, the optical fiber amplifier including a doped optical fiber and a pumping light source, and a transmission optical fiber including at l... | 02/21/2006 |
| 6999679 | Cancellation of optical signal reflections in bi-directional optical fibers Signal reflection mitigation in fiber-optic networks. Signal reflections are mitigated using near-end echo cancellation, threshold adjustment and/or error correction code. Signal reflections in a receive signal that are caused by near-end connectors may be mitigated... | 02/14/2006 |
| 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 |
| 6972687 | System and method for detecting a structure failure A system for quickly and reliably detecting a failed structure includes a signal source, a cable attached to the structure, an anti-slip cable anchor, a signal detector, and user indicator. When the structure fails, the cable attached to the structure is also broken... | 12/06/2005 |
| 6970653 | Fiberoptic system for communicating between a central office and a downstream station A fiber optic system for communicating between a central office and a downstream station is described. The central office has a TX unit, an RX unit and a continuous wave (“CW”) laser. Each station has an RX unit and a tunable filter coupling the RX unit to the c... | 11/29/2005 |
| 6947857 | Optical sequence time domain reflectometry during data transmission A method and system for performing sequence time domain reflectometry over a communication channel to determine the location of line anomalies in the communication channel is disclosed. In one embodiment, the system generates a sequence signal and transmits the sequ... | 09/20/2005 |
| 6934655 | Method and apparatus for transmission line analysis A method and system for performing sequence time domain reflectometry to determine the location of line anomalies in a communication channel is disclosed. In one embodiment, the system generates a sequence signal and transmits the sequence signal over a channel that... | 08/23/2005 |
