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| Number | Title | Issue Date |
| 8055127 | Wavelength division multiplex optical ring network A wavelength division multiplex optical ring network comprises optical fibre (1-4) arranged in a ring configuration and a plurality of doped fibre optical amplifiers (17-20) arranged in the ring. The spectral response in the ring is confi... | 11/08/2011 |
| 7751706 | Chromatic dispersion compensating apparatus In order to compensate for chromatic dispersion ad dispersion slope over an entire wavelength band of the optical signal, the wavelength band is split into a plurality of bands, and chromatic dispersion compensation is made to make chromatic dispersion in a central ... | 07/06/2010 |
| 7580629 | Los beat detector A loss of signal beat detector makes use of multiplication of a local clock signal and a recovered clock signal to obtain frequency deltas used to indicate loss signal. Through a hardware implementation, a high speed detection is offered, allowing changeover from th... | 08/25/2009 |
| 7444078 | Transient control solution for optical networks An optically amplified wavelength division multiplexing network has the functionality to add/drop channels at the optical add/drop multiplexing (OADM) nodes. The OADM node includes a receiver amplifier, an OADM module, and a transmitter amplifier. Once the OADM node... | 10/28/2008 |
| 7373087 | Adaptive optical transponder Systems and methods for optical communications. In one implementation, a communications device is provided. The communications device includes an Optical domain Adaptive Dispersion Compensation Module (OADCM); an Electrical domain Adaptive Distortion Compensation Mo... | 05/13/2008 |
| 7327689 | Data processing equipment with multi-function trace message processor A data processing equipment having an input to receive an input stream of data frames. The data frames contain a repeating trace message, each instance of the trace message being divided in fragments distributed over a series of data frames. The data processing equi... | 02/05/2008 |
| 7302177 | Optical transmission system including a plurality of optical transmission devices Two multiplexing/demultiplexing sections of working and protection sides are prepared for each of a plurality of optical transmission devices which constitute a system, and the optical transmission devices are synchronized with each other to execute switching betwee... | 11/27/2007 |
| 7245046 | Internal power re-routing by reverse powering to overcome fault scenarios in submarine cable systems System and method for re-routing internal power for reducing voltage requirements of a submarine transmission system. A power supply supplies power to a bridge rectifier circuit (10) the latter biasing a plurality of Zener diodes (11; 12; 13; 14; 15; 16 | 07/17/2007 |
| 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 |
| 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 |
| 7171125 | Power feed arrangement using aggregate segments A power feed arrangement for aggregate segments of a communications system is disclosed. In embodiments of the invention, cables are used to communicatively connect a number of landmasses, where the cables also serve to carry electrical power to devices connected al... | 01/30/2007 |
| 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 |
| 7136584 | Optical output power automatic attenuation circuit for optical communication apparatus An optical amplifier to which an optical output power automatic attenuation circuit according to the present invention is applied, comprises: one amplifier board to and from which a WDM light is input and output; and a plurality of booster boards which supply pumpin... | 11/14/2006 |
| 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 |
| 7123405 | Optical amplifying and relaying system An optical amplifying and relaying system capable of easily and highly accurately monitor troubles in optical amplifiers provided in an up and a down optical fiber transmission line opposing each other is disclosed. Monitoring light signal folding-back lines includi... | 10/17/2006 |
| 7103275 | Optical transmission system An optical transmission system capable of monitoring the operating status of Raman-amplifier repeaters even when an optical transmission line is partly disrupted by a fiber failure. An end station sends a monitoring command signal to request a particular repeater to... | 09/05/2006 |
| 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 |
| 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 |
| 7063564 | Electronic equipment rack having cables carrying both radio frequency and coded control signals A rack, in particular for cable television, having a number of modules whose inputs and outputs are connected by means of cables for the transmission of radio frequency signals and control signals, is described. The modules (2) are connected via the common in... | 06/20/2006 |
| 7039313 | Automatic protection system for an optical transmission system An optical communication system and method for starting up and shutting down the system to ensure safety during repair of a fiber break are disclosed. A technique for shutting down an optical communication system having spans of optical transmission fiber interspers... | 05/02/2006 |
| 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 |
| 6922532 | Optical performance monitoring for D/WDM networks A performance monitoring method for an optically amplified transmission system. The method provides the optical power at each amplifier site, taking into account the inaccuracies introduced by the SRS in the power estimation obtained with the current methods. An opt... | 07/26/2005 |
| 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 |
| 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 |
| 6658211 | Optical signal repeater and output level control method used in this repeater An optical signal repeater, in which an output level of each optical signal of WDM optical signals does not change even when the number of wavelengths of inputted WDM optical signals changes, amplifies WDM optical signals transmitted from an optical trans... | 12/02/2003 |
| 6359709 | Method for open fiber control propagation in multi-link fiberoptic connections A fiberoptic communications method is presented which allows an open-link condition on one link of a multi-link fiberoptic connection to be propagated to other links of the connection while satisfying the Open Fiber Control safety standard. Each link comp... | 03/19/2002 |
| 6359708 | Optical transmission line automatic power reduction system A facility is provided which detects the loss of a high power signal in an optical transmission path and invokes a procedure which causes a transmitter connected to the fiber to reduce the power level at which it is transmitting optical signals over the f... | 03/19/2002 |
| 6356367 | Open fiber control propagation in multi-link fiberoptic connections A fiberoptic communications computer program product is presented which allows an open-link condition on one link of a multi-link fiberoptic connection to be propagated to other links of the connection while satisfying the Open Fiber Control safety standa... | 03/12/2002 |
| 6344915 | System and method for shutting off an optical energy source in a communication system having optical amplifiers The present invention provides a system and method for intelligently shutting down an optical energy source in a communication system having optical amplifiers upon detection of a system failure.... | 02/05/2002 |
| 6310718 | Optical amplifying apparatus for detecting break point in optical transmission lines In an optical amplifying apparatus, a detour optical line is employed in addition to such an optical amplifier for amplifying light having a first wavelength of "λ1" and for outputting the amplified light. This detour optical line is operated in such a d... | 10/30/2001 |
| 6166836 | Power switching of optical fibre cable branching units A branching unit for an optical fibre cable system of the type which has an electrical power conductor for feeding current to electrical equipment provided along a main cable and a communication system and method of operating such a system is disclosed. T... | 12/26/2000 |
| 6134032 | Method and apparatus for automatically identifying system faults in an optical communications system from repeater loop gain signatures A method is provided for automatically identifying a system fault in an optical communication system that includes first and second transmission paths for supporting bidirectional communication. In accordance with the method, measurements are made of a pl... | 10/17/2000 |
| 6028684 | Path to provide OTDR measurements of an optical transmission system that includes optical isolators A path couples a pair of optical fibers in an optical transmission system. The transmission system includes a plurality of optical amplifiers placed along the transmission line. Associated with these optical amplifiers are optical isolators that limit the... | 02/22/2000 |
| 6008915 | Method of identifying faults in WDM optical networks In a WDM network employing optical amplifiers, a method of detecting changes in the number of channels present in erbium doped fiber amplifiers (EDFA) that are caused by faults or system reconfigurations. In accordance with the technique of the present in... | 12/28/1999 |
