Class 398/7 - WDM

Subclass of Class 398 - Optical communications
Definition: Subject matter wherein the faulty optical communication
No. of patents: 136
Last issue date: 11/30/2010

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Number	Title	Issue Date
6973267	Autoprotected optical communication ring network An autoprotected optical communication ring network is disclosed. The ring network includes two optical carriers that are arranged for bidirectional transmission. Multiple optically reconfigurable nodes are connected along the optical carriers. The nodes communicate...	12/06/2005
6968102	Node device of optical ring network A node device of an optical ring network is disclosed. With the node device, a counterclockwise auxiliary wavelength supplied from a third switch part is returned and supplied to a clockwise add/drop part when there is a fault in an optical transmission path on a le...	11/22/2005
6959128	Coupler-based optical cross-connect having a regeneration module An optical cross-connect includes multiple input ports that each receive an optical input signal and multiple output ports that each output an optical output signal. The optical cross-connect also includes a distributing amplifier associated with each input port tha...	10/25/2005
6956817	Communication system There is disclosed a communication system in which a line switch signal is sent to a remote station side from a local station side to switch a line without deteriorating the transmission efficiency. A CC message encoder allots the unused bit of CC message to a line ...	10/18/2005
6947623	Signals and methods for increasing reliability in optical network equipment Methods, apparatus and systems for regenerating, monitoring and bridging optical signals through an optical cross-connect switch to provide increased reliability. A self testing method, apparatus and system for an optical cross-connect switch. An optical-to-electric...	09/20/2005
6937823	Method for preventing lasing in an optical ring network Lasing of an optical channel at a particular wavelength is substantially prevented in an optical ring network by automatically verifying the presence of a break, e.g., termination, in the ring for an optical channel of a particular wavelength before allowing a node ...	08/30/2005
6934473	Optical systems including add drop devices and methods Optical systems of the present invention include an add/drop device and/or cross-connect device, which is reconfigurable to add and drop signal wavelengths between one or more transmission paths. The add/drop device includes a first selective element configurable to...	08/23/2005
6922530	Method and apparatus for optical channel switching in an optical add/drop multiplexer An optical add/drop multiplexing unit (16, 116) includes a demultiplexer (53, 153) which optically isolates component signals of an optical input signal from an optical input terminal (22, 122). A plurality of switching units (61, 161) ca...	07/26/2005
6917759	Shared mesh signaling algorithm and apparatus A shared mesh protection scheme defines an associated protection path when a working connection is established. During the protection path definition, the corresponding protection path information is sent down to a switch card of network elements making up the prote...	07/12/2005
6895183	Optical add-drop multiplexer An optical wavelength division coupler 11 wavelength-divides a wavelength multiplexed light to respective wavelength lights each of which is dropped to an optical gate switch 15-i (i=1˜n) and a light receiver 13-i by an optical coupler 12	05/17/2005
6853811	Dual-wave optical shared protection ring An optical ring is provided for propagating optical signal pairs over wavelength connections between nodes. Each optical signal pair includes two signals at different wavelengths. At one or more of the nodes, one signal of the pair acts as a transmit signal and the ...	02/08/2005
6850705	Online distributed path routing method and system A method and apparatus for selecting failure protection paths in a WDM network. The method exploits wavelength reservation sharing potentials presented by non-concurrent failure events on a plurality of links sharing a link in a protection path. Light-weight aggrega...	02/01/2005
6771852	Two-fiber optical shared protection ring with a bi-directional 4×4 optical switch fabric The present invention is directed to a protection switch for use in a node of a two-fiber optical shared protection ring. The two-fiber optical shared protection ring propagates at least one bi-directional channel. Each bi-directional channel includes a working firs...	08/03/2004
6735392	System and method for transmitting and restoring an optical signal A system and method for transmitting and restoring an optical signal in an optical ring is presented. The optical ring comprises a plurality of nodes, each node containing an optical cross connect switching fabric coupled to a data switch. The optical cross connect ...	05/11/2004
6735391	Automatic retrieval of wavelength-division multiplexed ring networks The present invention relates to an automatic retrieval method of a wavelength-division multiplexed (WDM) ring network to the normal state after recovery of a failure. More specifically, the present invention relates to an automatic retrieval method of a WDM ring ne...	05/11/2004
6647174	Optical fiber transmission bypass device An optical transmission bypass device attaching a network device to a fiber optic network allows fiber optic transmissions to bypass the network device when not powered, thereby maintaining continuity of the fiber network. A first and second actuating opt...	11/11/2003
6643041	Optical network A first object of the invention of the present application is to provide an optical network capable of flexibly performing a choice of protection optical paths upon the occurrence of a failure without depending on an installation form of an optical transm...	11/04/2003
6616348	Method and optical communication network for bidirectional protection protocols A method for operating a redundant optical communication network has at least two network transmission paths, assigns first and second protection protocols to switched signals and secondary signals respectively, adds and drops the switched signals and sec...	09/09/2003
6579018	Four-fiber ring optical cross connect system using 4×4 switch matrices An optical cross-connect system provides 4×4 switching matrices and self-healing from any single point of failure. The switching matrices route working traffic and redundant protection traffic between a plurality of client network elements and an optical...	06/17/2003
6542268	OPTICAL CHANNEL CROSS CONNECT FOR TELECOMMUNICATION SYSTEMS IN WDM TECHNOLOGY (WAVELENGTH DIVISION MULTIPLEXING) HAVING A DOUBLE SPATIAL SWITCHING STRUCTURE OF OPTICAL FLOWS STRICTLY NOT BLOCKING AND INTERPOSED FUNCTIONAL UNITS OPERATING ON SINGLE CHANNELS An optical cross-connect for the switching of optical channels at variable bit-rate (up to 10 Gbit/s), wavelength division multiplexed on bi-directional optical fibers forming the transmission backbone of a transport network; in particular the cross-conne...	04/01/2003
6320684	WDM optical transmission system A wavelength division multiplexing (WDM) optical transmission system includes a node having a wavelength-demultiplexer, an optical switch connected to the demultiplexer, a regenerative repeater circuit connected to the switch, a controller, a monitor sign...	11/20/2001
6266168	Optical protection switch employing an interference filter A protection facility is provided for use in an optical communications node that communicates with another optical communications node via first and second bidirectional communications paths respectively serving as a service path and protection path, in w...	07/24/2001
6249510	Signal protection system for bi-direction ring network The channel protection facility in a two-fiber bi-directional line switched ring network may be significantly enhanced by protecting the service channels in one of the fibers with corresponding protection channels in the other fiber and vice-versa. Thus, ...	06/19/2001
6222653	Optical communication node and wavelength division multiplexing optical transmission device having ring structure comprising the optical communication nodes A device comprises a plurality of nodes and four optical transmission lines of clockwise and counter-clockwise working operation lines and clockwise and counter-clockwise stand-by lines which connect the nodes in form of a ring. Each node is provided with...	04/24/2001
6198721	Method and system for data transmission in a ring network A method and system for data transmission in a 2-fiber ring network having a plurality of network nodes wherein working signals are bidirectionally transmitted between terminal multiplexers and add/drop multiplexers on a part of the network and wherein pr...	03/06/2001
6195186	Optical WDM ring network A ring network is composed of an even-number of optical fibers wherein each pair of optical fibers forms a bidirectional transmission line and a plurality of nodes coupled through the optical fibers in ring topology. In this ring system, each of the nodes...	02/27/2001
6160648	Method and arrangement for detecting faults in a network The present invention relates to an arrangement and a method for detecting faults in an optical fiber network, comprising at least two nodes arranged with at least two optical fibers to a bus with the end nodes connected via two spare fibers. Every node c...	12/12/2000
6115155	System for dealing with faults in an optical link A system for dealing with faults in wavelength division multiplexed (WDM) optical communications between two terminals connected by at least two optical fibers monitors the status of communications over both optical fibers. If both optical fibers are oper...	09/05/2000
6115154	Method and system for detecting loss of signal in wavelength division multiplexed systems A method and system for unambiguously detecting fiber cuts in an optical network regardless of the number of EDFAs that are located between the fiber cut and the monitor point. In accordance with our invention, the power of a marker wavelength is compared...	09/05/2000
6111675	System and method for bi-directional transmission of telemetry service signals using a single fiber A bi-directional telemetry service channel is provided on a single optical fiber using two wavelengths that are accessible through multiplexing devices. A bi-directional telemetry service channel is also provided on a single optical fiber using only a sin...	08/29/2000
6101010	Pass-monitoring apparatus of optical network system It is the object of the invention to detect and locate fails in the optical network by superposing monitoring signals on respective WDM optical signals in the transmitter part of the pass-monitoring apparatus and detecting the monitoring signals on the ou...	08/08/2000
6088141	Self-healing network A communication network system having at least three nodes, which are interconnected by transmission links carrying traffic to and from the nodes. The transmission links are divided into a working ring and a protection ring where the working ring and the ...	07/11/2000
6075629	Optical protection switch employing an interference filter A bi-directional protection facility is provided in an optical communication system in which an optical communications node communicates with another optical communications node via first and second bi-directional communications paths respectively serving...	06/13/2000
6072610	Optical transmission system An optical transmission system includes an optical path cross-connect device and an electrical cross-connect device connected by a plurality of working and standby input/output interface links. Optical signals in the working and standby systems are entere...	06/06/2000
6025941	Stable wavelength division multiplex ring network We have recognized that in a Wavelength Division Multiplex (WDM) ring network with a closed loop, the possibility of lasing at Amplified Spontaneous Emissions (ASE) wavelengths exists. In accordance with the present invention, we provide a technique for p...	02/15/2000
6023359	Optical wavelength-division multiplex transmission equipment with a ring structure In optical wavelength-division multiplex transmission equipment where a plurality of nodes are connected in the form of a ring, the nodes are connected by four optical fiber transmission lines consisting of a pair of working transmission lines and a pair ...	02/08/2000
5995256	Method and system for managing optical subcarrier reception A method and apparatus are provided for high signal-to-noise ratio (SNR) optical subcarrier management and reception in a communication network. In a multiple-wavelength optical communications link, ancillary signals that are conveyed by low-level intensi...	11/30/1999
5986783	Method and apparatus for operation, protection, and restoration of heterogeneous optical communication networks Techniques for providing normal operation and service restoration capability in the event of failure of terminal equipment or transmission media in a heterogeneous network, such as a hybrid network containing single- and multi-wavelength lightwave communi...	11/16/1999
5982517	Method and system for service restoration in optical fiber communication networks A service restoration system and method for a mixed SONET/WDM optical fiber telecommunication networks comprising a plurality of self healing SONET rings and at least one WDM link which is shared by these SONET rings, provides protection on the optical la...	11/09/1999
5963348	Method for assignment of wavelength channels in an optical bus network Channels are assigned in an optical bus network, including N nodes connected in series to one another by way of a pair of optical fibers, which facilitate simultaneous, two-way communication between all nodes of the bus network. A second pair of optical f...	10/05/1999

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Class 398/7 - WDM