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| Number | Title | Issue Date |
| 7844177 | Optical signal changeover device and optical signal changeover method Disclosed herein are a device and a method for an optical signal changeover that will not necessitate any addition to the capacity of the optical signal selection unit even when the N×M optical switches are expanded in scale, but can keep the optical signal selecti... | 11/30/2010 |
| 7747164 | Wavelength division multiplexing transmission system, wavelength division multiplexing transmission apparatus and method for controlling wavelength division multiplexing transmission apparatus A wavelength division multiplexing transmission system that comprises an input/output terminal station for an optical signal, and an intermediate station located between the terminal stations and connected by an optical transmission line for performing wavelength di... | 06/29/2010 |
| 7660526 | Through channel loss prevention at a WDM node At a WDM add/drop node of an optical fiber, an add/drop multiplexer system with opto-electric components in the through channel path has an optical switch connected in parallel with an add/drop multiplexer. Upon a power loss to the add/drop multiplexer, the optical ... | 02/09/2010 |
| 7627243 | Methods and apparatuses for handling multiple failures in an optical network Methods and apparatuses for handling multiple failures in an optical network are described herein. In one embodiment, an exemplary method includes receiving a demand for allocating a protection path that meets a set of disjointness constraints with respect to a work... | 12/01/2009 |
| 7532817 | Fiber optic link protection apparatus A fiber optic protection apparatus includes a first optical switch, a first fault detection device, and first switch control device. The first optical switch is placed at the reception node of an optical link and has a primary input port connected to a primary optic... | 05/12/2009 |
| 7450844 | WDM optical transmission equipment with redundant configuration, and wavelength control method of light output in standby system WDM optical tranmsmission equipment with redundant configuration includes a plurality of tranmitters. Each tranmitter includes active and standby panels including active and standby optical transmission circuits respectively having active and standby attenuators for... | 11/11/2008 |
| 7440698 | Optical transmitter system An optical transmitter system supplies a plurality of different wavelength optical radiation components to a transmission element which, in operation, is connected to the transmitter system for conveying the different wavelength radiation components to a respective ... | 10/21/2008 |
| 7421197 | Optical network protection switching architecture A method for protection switching includes receiving an optical signal from a transponder coupled to a client and optically splitting the signal to a first output and a second output. The first output is coupled by a first optical add-drop multiplexer to a first opt... | 09/02/2008 |
| 7415205 | Wavelength division multiplexed self-healing passive optical network using wavelength injection method A wavelength division multiplexed self-healing passive optical network using a wavelength injection method includes a central office for coupling modulated multiplexed optical signals (MMOS) and broadband optical signals (BOS)for an upstream light source into one si... | 08/19/2008 |
| 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 |
| 7389043 | Protection architecture for photonic switch using tunable optical filter A method and a protection switching arrangement for protection switching of any one of a plurality of optical signals of a multi-wavelength optical signal from the failure of an optical component is provided. The multi-wavelength optical signal which contains the op... | 06/17/2008 |
| 7376348 | Optical communication system An optical transmission equipment in an optical communication system interconnecting two optical transmission equipment sets by a main transmission line and a backup transmission line. An optical amplifier amplifies and outputs optical signals from one transmission ... | 05/20/2008 |
| 7372803 | Apparatus and method for establishment and protection of connections within mesh networks A node within a mesh network includes an Optical Connection Controller (OCC) and a network element. When a connection path within the mesh network is required, an OCC determines if a particular connection path requires a network element to operate as a virtual gatew... | 05/13/2008 |
| 7369769 | Ethernet passive optical network ring and its method of authorization and collision detection An Ethernet passive optical network (EPON) ring for providing protection against fiber failures. The optical network unit (ONU) is coupled to the ring fiber by a three-port passive optical splitting module that has three two-way optical passages. By the three two-wa... | 05/06/2008 |
| 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 |
| 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 |
| 7346277 | Joint-layer restoration in packet-over-optical networks A joint “packet-optical” layer restoration mechanism protects against single, packet-layer router failures by managing network resources from both the packet layer and the optical transport layer in a synergistic manner. It reuses packet-layer router service-por... | 03/18/2008 |
| 7302190 | Optical communication system including replaceable electro-optic and opto-electric converters In an optical transmitting or receiving apparatus, a plurality of replaceable electro-optic converters or a plurality of replaceable opto-electric converters are provided in correspondence with optical transmission lines. ... | 11/27/2007 |
| 7298974 | Optical communication network system A fiber optic communication system includes a device of switching and setting wavelength of optical signals used in communication by network-node equipments, which sets the mapping of the wavelength of the optical signal used in communication by the network node equ... | 11/20/2007 |
| 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 |
| 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 |
| 7280755 | Highly utilizable protection mechanism for WDM mesh network In this application, the invention is a novel heuristic mechanism of working path and backup path reservation for highly utilizable WDM mesh networks, which we call dynamic-network adapted cost selection (DAC-selection) mechanism. One of its characteristics is simpl... | 10/09/2007 |
| 7277632 | Method for assigning wavelengths in wavelength division multiplexing ring communication network A method for assigning a predetermined wavelength between two different nodes in a wavelength division multiplexing (WDM) ring communication network that has an N number of nodes and at least one pair of optical fibers sequentially connecting the N number of nodes i... | 10/02/2007 |
| 7272307 | Virtual protection channel for fiber optic ring network A single, normally inactive, protection ring, provides protection against a working channel failure in a fiber optic ring network. The protection channel is established and put into operation by a series of steps that are triggered by the detection of signal degrada... | 09/18/2007 |
| 7272323 | Bi-directional electrical to optical converter module A bi-directional (BiDi) electrical to optical converter (transceiver) module is described that contains means for communicating in a full duplex fashion over one fiber. Furthermore, an automatic fail-over capability is included which allows redundancy to be build in... | 09/18/2007 |
| 7266598 | Programmable data center Techniques are disclosed for providing a programmable data center, which includes a plurality of computers, a plurality of computing devices or resources, a programmable service fabric, and an operation controller. The computers act as computing hosts; the resources... | 09/04/2007 |
| 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 |
| 7233738 | Protection switching architecture and method of use A protection switching architecture is used in a telecommunications system such as a wavelength division multiplexed (WDM) telecommunications system to replace a failed transmission line or a failed wavelength processing device. A spare wavelength processing device ... | 06/19/2007 |
| 7233743 | Lightpath segmentation system and method in a generalized multi-protocol label switching network A lightpath segmentation system and method for use in a GMPLS network is described. In one embodiment, lightpaths are divided into segments according to the distribution of the wavelength-converter-equipped optical switches, or nodes, within a WDM network. As the nu... | 06/19/2007 |
| 7218852 | System and method for optical light path discovery A system and method for discovering lightpath information in an optical network is disclosed. A selected node is requested to provide lightpath information. The node, in turn, requests the other node of the optical network to provide channel attribute data. The node... | 05/15/2007 |
| 7215843 | Optical switching apparatus and optical switching method An optical switching apparatus includes an optical switch having a plurality of input ports and output ports, optical amplifiers, monitor circuits, optical amplifiers monitor circuits, and a controller that controls the optical switch. The optical amplifiers are con... | 05/08/2007 |
| 7212739 | Protection switching arrangement for an optical switching system A protection arrangement for an optical switching system includes protection switching for switch planes in the optical core and for ports in the tributary cards. For a multiple layer switch core protection is also provided between layers. A first layer is for switc... | 05/01/2007 |
| 7212738 | Preventing signal loss in an optical communications network A redundant optical signal transmission and reception system enables information exchange via an optical communications network without data loss in the event of optical transmitter or receiver failure. In one embodiment, the redundant optical signal system includes... | 05/01/2007 |
| 7209454 | Self-configuring distributed switch An optical channel switch comprising independent optical space switches interconnects electronic data-switch modules to form a high-capacity wide-coverage network. The optical channel switch connects incoming wavelength-division-multiplexed (WDM) links each originat... | 04/24/2007 |
| 7197241 | Optical transmission systems including optical protection systems, apparatuses, and methods Optical transmission systems of the present invention include optical protection systems, apparatuses, and methods that provide increased reliability in the system. The optical system generally includes an optical switch having distinct, cooperating dedicated and sh... | 03/27/2007 |
| 7187865 | Hybrid photonic/electronic switching in a multi-channel network A system for hybrid electronic/photonic switching of traffic in a node of a communications network includes a plurality of interfaces; an electronic cross-connect (EXC); and a photonic cross-connect (PXC). Each interface is designed to translate a respective traffic... | 03/06/2007 |
| 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 |
| 7174096 | Method and system for providing protection in an optical communication network A method and system for providing tandem protection in a communication system. Path protection is provided using at least two redundant communication paths and selecting the communication path having a higher signal quality. Interface protection is provided through ... | 02/06/2007 |
| 7170852 | Mesh with projection channel access (MPCA) A method for a communications network with a protect channel transmitting protect channel data and working channel transmitting working channel data includes transmitting the working channel data via the protect channel upon a disruption in the working channel, and ... | 01/30/2007 |
| 7161898 | Common protection architecture for optical network A communication network is arranged in a ring configuration of network elements (12) coupled by working spans (16) associated protection spans (18), with multiple rings sharing network elements (12a and 12b). A shared... | 01/09/2007 |
