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| Number | Title | Issue Date |
| 8135274 | System and method for fault identification in optical communication systems A system and method for fault identification in optical communication networks. One or more repeaters in the system includes a loop back path that couples an output a first amplifier for amplifying signals carried in a first direction through a repeater to an input ... | 03/13/2012 |
| 7471895 | Method and apparatus for obtaining status information concerning optical amplifiers located along an undersea optical transmission line using COTDR A method is provided for locating a fault in one or more optical amplifiers operating in saturation and located along an optical transmission path. The method begins by generating a coherent optical time domain reflectometry (COTDR) trace representing a backscattere... | 12/30/2008 |
| 7254339 | Power controlling network element A power controlling network element for a communication system includes a detector for measuring radiation power present in components of radiation; element parts, for example a channel control unit (CCU), transponders and other modules, for at least one of: (i) tra... | 08/07/2007 |
| 7236238 | Method and apparatus for monitoring the quality of optical links A method and apparatus for monitoring the quality of an optical link is disclosed. According to a first aspect of the present invention, a method for determining a quality of an optical link is disclosed. The method includes identifying a known signal and transmitti... | 06/26/2007 |
| 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 |
| 7200337 | Optoelectronic transceiver having dual access to onboard diagnostics An optoelectronic transceiver includes first and second controller ICs. Each controller IC includes logic, a memory, an interface, and at least one input port. Each memory is configured to store digital diagnostic data and has a unique serial device address to allow... | 04/03/2007 |
| 7184668 | System and method for protecting eye safety during operation of a fiber optic transceiver A single-chip integrated circuit, sometimes called a controller, controls operation of a transceiver having a laser transmitter and a photodiode receiver. The controller includes memory for storing information related to the transceiver, and analog to digital conver... | 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 |
| 7177074 | Circuit and method for safety shutdown of an optical amplifier A circuit and associated method for safety shutdown of an optical amplifier, wherein the power of an amplified spontaneous emission ASE is subject to a correction factor and subtracted from a measured signal extracted from the optical signal. ... | 02/13/2007 |
| 7162160 | System and method for protecting eye safety during operation of a fiber optic transceiver A single-chip integrated circuit, sometimes called a controller, controls operation of a transceiver having a laser transmitter and a photodiode receiver. The controller includes memory for storing information related to the transceiver, and analog to digital conver... | 01/09/2007 |
| 7161734 | Method and apparatus for controlling power transients in an optical communication system A method and apparatus for controlling transients in an optical signal propagating along an optical fiber path interconnecting a plurality of network elements employs a power threshold to determine an appropriate response given a change in optical signal power. ... | 01/09/2007 |
| 7158728 | Optical repeating system and optical amplifying repeater control method An optical repeating system includes an optical transmitter and a plurality of optical amplifying repeaters. The optical transmitter specifies a part or all of the optical amplifying repeaters, and transmits a supervisory command to the specified optical amplifying ... | 01/02/2007 |
| 7151895 | Method and system for automatically setting gain for an amplifier in an optical network A method for automatically setting a gain for an amplifier in an optical network includes transmitting, from a source proximate an upstream amplifier coupled to an optical span, a stable signal over the optical span. The method also includes using the stable signal ... | 12/19/2006 |
| 7149430 | Optoelectronic transceiver having dual access to onboard diagnostics The optoelectronic transceiver includes first and second controller ICs. Each controller IC includes logic, a memory, an interface, and at least one input port. Each memory is configured to store digital diagnostic data and has a unique serial device address to allo... | 12/12/2006 |
| 7133611 | Main signal controlling apparatus and method in a WDM optical communications system If a repeater supervisory control (SV), a pre-emphasis automatic adjustment (PE), a receiving side threshold value automatic adjustment (Vth), a transmitting side dispersion compensation value setting (VDC(T)), and a receiving side dispersion compensation value sett... | 11/07/2006 |
| 7130544 | Optical repeating system and optical amplifying repeater control method An optical repeating system includes an optical transmitter and an optical amplifying repeater. The optical transmitter transmits a supervisory command and a control command to the optical amplifying repeater as a first sub-signal. The supervisory command is a comma... | 10/31/2006 |
| 7113698 | Fault detection and isolation in an optical network A system for detecting faults in an optical network having switching nodes and amplifier nodes is provided. According to one aspect of the system, one or more amplifier nodes are coupled between two switching nodes. Each amplifier node is capable of detecting a faul... | 09/26/2006 |
| 7099595 | Optical wavelength multiplexing transmission apparatus and optical output control method for optical wavelength multiplexing transmission apparatus The present invention provides an optical wavelength multiplexing transmission apparatus and an optical output control method for an optical wavelength multiplexing transmission apparatus in an optical wavelength multiplexing transmission system using a main signal ... | 08/29/2006 |
| 7050720 | Integrated memory mapped controller circuit for fiber optics transceiver A controller for controlling a transceiver having a laser transmitter and a photodiode receiver. The controller includes memory for storing information related to the transceiver, and analog to digital conversion circuitry for receiving a plurality of analog signals... | 05/23/2006 |
| 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 |
| 6980711 | Automatically switched redundant switch configurations A branch unit for a fiber optic system that includes a service path and a protection path, whereby the branch unit provides switching to account for problems due to fiber cuts and/or equipment failures that may occur in the fiber optic system. The service and protec... | 12/27/2005 |
| 6937820 | Optical level control method The present invention relates to an optical level control method for use in an optical transmission system. In the system, a WDM terminal comprises a multiplexing/demultiplexing unit, an amplifier, an up-direction OSC light transmitting/receiving unit, an up-directi... | 08/30/2005 |
| 6924927 | Optical transmitting apparatus and optical repeating apparatus In an optical amplifying technique using remote pumping, an optical transmitting apparatus and an optical repeating apparatus are provided. An optical repeating apparatus comprises a first optical transmitting unit, a first loopback unit, a second optical transmitti... | 08/02/2005 |
| 6920287 | Smart connect To automate fiber connectivity management in optical systems, a dedicated low bit-rate communications channel unique to each fiber connection in an optical system is provided. The dedicated communications channel simplifies fiber connectivity management by supportin... | 07/19/2005 |
| 6907196 | Arrangement and method for testing fiber optic telecommunications circuits over dense wavelength division multiplexing (DWDM) An arrangement and a method for testing a telecommunications circuit over Dense Wavelength Division Multiplexing (DWDM). A transmitter, which is optically coupled to the circuit, transmits a test-drive signal on the circuit. Through a network, a performance of the c... | 06/14/2005 |
| 6819875 | Optical wavelength multiplexing transmission apparatus and optical output control method for optical wavelength multiplexing transmission apparatus The present invention provides an optical wavelength multiplexing transmission apparatus and an optical output control method for an optical wavelength multiplexing transmission apparatus in an optical wavelength multiplexing transmission system using a main signal ... | 11/16/2004 |
| 6816683 | Wavelength division multiplexing communications network supervisory system A supervisory system in a wavelength division multiplexing communications network is provided with a first and a second terminal stations and a repeater unit. The first terminal station transmits a supervisory signal to the second terminal station. The second termin... | 11/09/2004 |
| 6810210 | Communication path impairment detection for duplex optic communication link A communication path impairment detection module for connection to a duplex optic communication link is provided. The duplex optic communication link includes an outgoing communication path and an incoming communication path, each being characterized by a data chann... | 10/26/2004 |
| 6807370 | Optical transmission system An optical transmission system with a mechanism to locate a fault on a transmission line effectively and efficiently to ensure the quality of communication between end stations and repeaters. Repeaters respond to a monitoring control command sent from an end station... | 10/19/2004 |
| 6804469 | Supervisory system of optical amplifier repeater system and supervisory method of optical amplifier repeater system A supervisory system and supervisory method of an optical amplifier repeater are proposed that can implement operation supervision taking account of the characteristics of individual supervisory targets of the optical amplifier repeater, thereby achieving higher rel... | 10/12/2004 |
| 6778783 | Optical pulse transmission system, optical pulse transmitting method and optical pulse detecting method An optical transmission system is provided, which permits high-precision optical transmission of a signal even if the signal has a high accurate timing, an indefinite period, and a DC component. The transmitting side is provided with a rise edge detecting circuit | 08/17/2004 |
| 6708004 | Method and apparatus for reducing crosstalk between a monitoring channel and a data channel in a WDM optical communication system An optical communication system is provided that includes first and second optical transmitters/receivers remotely located with respect to one another and which are coupled together by first and second optical transmission paths for bidirectionally transmitting opti... | 03/16/2004 |
| 6671469 | Supervisory apparatus for transmission lines A supervisory apparatus able to prevent recirculation of a supervisory frame when sending a supervisor frame for supervision, which supervises an optical communications apparatuses connected to transmission lines in cooperation with the same by adding a s... | 12/30/2003 |
| 6323981 | Method and apparatus for detecting intermittent faults in an optical communication system A method is provided for locating an intermittent fault occurring in an optical transmission system that includes a plurality of repeaters extending along first and second optical transmission paths for supporting bi-directional communication. In accordan... | 11/27/2001 |
| 6222668 | Fast loss of signal (LOS) detection for bidirectional optical amplifiers A fast means of detecting that a fiber has been disconnected at one end of a bidirectional optical amplifier by monitoring for several signature effects simultaneously. Upon detection of a loss of signal, the pump laser in the corresponding direction is s... | 04/24/2001 |
| 6201635 | Optical amplifier The invention relates to an optical amplifier; more particularly, the invention provides an optical amplifier that contains a front-end optical amplifier and a back-end optical amplifier, and that is equipped with an automatic compensation function for au... | 03/13/2001 |
| 6064501 | Method of determining optical amplifier failures The invention is directed to a failure detection system and method for detecting malfunction of an optical amplifier module with one or multiple transmission channels. The failure detection system comprises a unit for measuring a performance parameter of ... | 05/16/2000 |
| 5510925 | Relay transmission system including optical amplification An optical amplification relay transmission system containing, on a transmission line, an optical repeater for amplifying and relaying an optical signal. The object of the present invention is to perform monitoring of the optical transmission line and opt... | 04/23/1996 |
| 5260819 | Digital telemetry system and method for fault detection in optical transmission system A digital telemetry system/method for locating faults in an optical transmission system including optical amplifiers, in particular optical fiber amplifiers. A supervisory codeword is applied at the transmission end of the system. At each amplifier the pr... | 11/09/1993 |
| 4899043 | Fault monitoring system for optical fiber communication systems A fault monitoring system for optical fiber communication system having a bidirectional optical amplifier between first and second optical fiber transmission lines. An optical monitoring signal of a first frequency different from frequencies of communicat... | 02/06/1990 |
