Did You Know...
...that when IBM conducted a market study of Chester Carlson's invention in 1959, the company concluded that it would take only 5000 units of his new product to saturate the market? IBM therefore declined to be part of the new product introduction. Too bad for IBM. Carlson's invention was the xerography process, and his new product was the beginning of the Xerox Corporation. It is estimated that every day, worldwide, 3,000,000,000 copies are made!!
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| Number | Title | Issue Date |
| 8155517 | Optical packet switching apparatus An optical packet switching apparatus includes plural optical switches, an optical switching section that switches a path of an optical packet transmitted thereto according to the switch control signal to output the optical packet, and a control section that takes o... | 04/10/2012 |
| 7995916 | Verification of path integrity in optical switch network To verify the integrity of optical paths through and among optical switches, optical signals are provided with co-propagating supplemental signals. The supplemental signals preferably have at least one characteristic which allows distinguishing one supplemental sign... | 08/09/2011 |
| 7848646 | Optical, network, node apparatus and method for recovery path fault Normality of links on a spare path or the links and nodes is monitored. When the spare path cannot be used, at least any one of nodes at both ends in a segmented path section is changed to another node on a working path. The segmented path section is changed to set ... | 12/07/2010 |
| 7805075 | Methods of restoration in an ultra-long haul optical network A method includes receiving a restoration indicator associated with a path that includes an optical cross-connect (OXC). The OXC is reconfigured from a standby configuration to a restoration configuration in response to the restoration indicator. An optical signal r... | 09/28/2010 |
| 7627244 | Optical transmission apparatus, continuity testing method therein, and optical transmission system An optical transmission apparatus comprises a preamplifier controlling unit for controlling a preamplifier so that amplified spontaneous emission including all wavelength bands of a wavelength-multiplexed signal beam is outputted toward a wavelength demultiplexing u... | 12/01/2009 |
| 7561795 | Dynamic interlayer protection in optical telecommunication networks The present invention relates to a method for protecting an optical telecommunication network against possible failures and signal degrades, the network comprising at least two nodes; working resources and protecting resources connecting the nodes; a first protectio... | 07/14/2009 |
| 7526198 | Methods of restoration in an ultra-long haul optical network A method includes receiving a restoration indicator associated with a path that includes an optical cross-connect (OXC). The OXC is reconfigured from a standby configuration to a restoration configuration in response to the restoration indicator. An optical signal r... | 04/28/2009 |
| 7426347 | Shared optical performance monitoring An apparatus for shared optical performance monitoring (OPM) is provided. A wavelength sensitive device receives light at an input port and routes it wavelength selectively to a set of output ports. To perform optical performance monitoring on the output ports, a mo... | 09/16/2008 |
| 7424220 | Optical transmission system with two-mode ring protection mechanism for prioritized client signals An optical transmission system that offers more efficient bandwidth usage in normal operation, as well as enhanced fault tolerance for higher service availability. A transponder converts high-priority and low-priority client signals into high-priority and low-priori... | 09/09/2008 |
| 7409154 | System and method for a protected optical access ring network An optical access network employs a ring topology in which connections between the network units and between the network units and the optical line terminal are via a protection switch. The protection switch monitors connections from the optical network units to det... | 08/05/2008 |
| 7400828 | Fault protection in networks A network is maintained functional in the presence of a wide range of faults, including physical fiber cuts, transmission impairments creating signal quality degradation, and failure of equipment modules, for example, transceivers, using a common control and backup ... | 07/15/2008 |
| 7366413 | Modular cross connect system with 3D-MEMS for optical telecommunication networks A modular cross connect system for optical telecommunication networks has the optical unit divided in at least two main bodies with one section for connection comprising the collimators and a main commutation section with MEMS devices. The first section is a fixed p... | 04/29/2008 |
| 7330424 | Node device in network, and network system The present invention provides a node device for connecting a plurality of networks. The node device comprises a plurality of input units for respectively inputting data from first transmission lines installed in each of the networks, a plurality of output units for... | 02/12/2008 |
| 7313330 | Redundant apparatus and method for gigabit ethernet passive optical network system and frame format thereof A GE-PON (Gigabit Ethernet Passive Optical Network) apparatus includes a 2×N splitter, an OLT (Optical Line Terminal) connected to the 2×N splitter via a first path line or a second path line, and a switching unit for switching the first path line or the second pa... | 12/25/2007 |
| 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 |
| 7289728 | Use of variable ratio couplers for network protection and recovery The disclosure is directed toward an optical transmission system comprising a primary path disposed between a first end and a second end. The primary path is configured to transmit optical signals between the first end and the second end. A secondary path is dispose... | 10/30/2007 |
| 7283742 | Optical signal judging system and optical signal judging method An optical signal judging system for judging an optical signal outputted from an optical switch the selectively outputs any one of input optical signals, comprises: a converting unit converting at least two optical signals branching off from an optical signal source... | 10/16/2007 |
| 7282709 | Charged particle beam detection system A charged particle beam detection system that includes a Faraday cup detector array (FCDA) for position-sensitive charged particle beam detection is described. The FCDA is combined with an electronic multiplexing unit (MUX) that allows collecting and integrating the... | 10/16/2007 |
| 7277606 | Optical switch device An optical switch device is disclosed that includes an optical system deflecting and outputting input light signals using deflector parts; resistor parts provided in corresponding routes for feeding driving signals output from drivers to the corresponding deflector ... | 10/02/2007 |
| 7274876 | Integrated electrical/optical hybrid communication system with revertive hitless switch A system according to embodiments of the invention may include a first communication path that converts an optically-modulated source signal to a radio signal based on a detected degradation in a quality of a received optical signal, and a second communication path ... | 09/25/2007 |
| 7274869 | System and method for providing destination-to-source protection switch setup in optical network topologies A system and method for establishing protection routes in optical mesh networks. A protection protocol is provided that utilizes a destination-to-source communication channel to establish a source-to-destination protection route. The communication channel is establi... | 09/25/2007 |
| 7266297 | Optical cross-connect A bit-rate-transparent electrical space-division switching matrix is employed in an optical cross-connect and the input/output stage is constructed from simple, broadband optical receivers and transmitters. Since the switching matrix operates in unclocked manner, i.... | 09/04/2007 |
| 7260325 | Network component for an optical network comprising an emergency operation function, especially for an optical network in ring topology A network component (3d) for an optical network (1) is described, including a coupling device (2; 4, 5) for optical coupling of the network component (3d) to the optical network (1), the coupling device (2; 4, 5 | 08/21/2007 |
| 7260655 | Optical routing using star switching fabric with reduced effective switching time In one embodiment, a router includes a star switching fabric operable to receive a plurality of optical signals each having a wavelength and each associated with a payload received by the router and to communicate from the switching fabric a plurality of substantial... | 08/21/2007 |
| 7248799 | Method and an improved device for controlling the power delivered at the output of a node of an optical network that switches bands of wavelengths A device (D) is dedicated to controlling the power of optical signals in a transparent switching node of an optical communication network that switches bands of wavelengths. The device includes, firstly, a controller (12) for comparing input optical power mea... | 07/24/2007 |
| 7245836 | Optical pulse timing detection apparatus, optical pulse timing detection method, optical pulse timing adjustment apparatus, and optical pulse timing adjustment method Incident signal beam pulses are transmitted by an on-state region, and an optical path for the signal beam pulses is spatially switched in an optical switch. Signal beam pulses transmitted by the on-state region of the optical switch are detected at a pixel correspo... | 07/17/2007 |
| 7242861 | Optical path cross-connect and optical wavelength multiplexing diversity communication system using the same A protection system protects paths of internetwork communication between WDM ring networks, and includes a plurality of optical wavelength multiplexing networks having a plurality of nodes and a network management system for monitoring conditions of the plurality of... | 07/10/2007 |
| 7239773 | Optical-switch testing apparatus, optical-signal switching apparatus, optical-switch testing method, and control method for optical-signal switching A light source supplies optical signal to an optical switch and a detector detects light receiving level. A control unit changes a deflection control amount for changing an angle of a tilt mirror, and outputs the deflection control amount to a driving unit. When an ... | 07/03/2007 |
| 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 |
| 7221652 | System and method for tolerating data link faults in communications with a switch fabric A system and method are provided for tolerating data line faults in a packet communications network. The method comprises: serially transmitting information packets from at least one traffic manager (TM); at a switch fabric, accepting information packets at a plural... | 05/22/2007 |
| 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 |
| 7200329 | Wavelength path monitoring/correcting apparatus in transparent optical cross-connect and method thereof A wavelength-path-monitoring/correcting apparatus used in a transparent OXC is disclosed. The apparatus includes: a path-information-generating section for generating path-monitoring information; a plurality of optical couplers for coupling each output signal of the... | 04/03/2007 |
| 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 |
| 7197213 | System and method for controlling deflection of optical beams A method of controlling deflection of an optical beam at a beam steering element. The method comprises receiving switching instructions indicative of a target one of a plurality of potential transmit or receive elements; determining a control signal associated with ... | 03/27/2007 |
| 7171118 | Optical cross-connect used in an optical network and method performed by the same Disclosed are an apparatus and a method for shortening a processing time at each node in an optical network. A transmission optical cross-connect (OXC) determines a transmission rate corresponding to the transmission speed of the signal to be transmitted. An optical... | 01/30/2007 |
| 7167611 | Transparent optical switch A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a sign... | 01/23/2007 |
| 7161910 | Minimum cost routing based on relative costs of node resources In a communications network, each network node includes a first module that handles a group of channels between its input and output ports as a route decision unit and a second module that handles a channel between its input and output ports as a route decision unit... | 01/09/2007 |
| 7158696 | Transparent optical switch A transparent optical switch includes network management and performance monitoring using bit level information obtained by extracting selected information on a polling basis and analyzing the extracted information in the electrical domain. In one embodiment, a sign... | 01/02/2007 |
| 7155123 | Method and apparatus for locating faults in an optical network Method and apparatus for fault localization in an optical network using time trend correlation of end node performance parameters and intermediate node performance parameters, such as QoS and quasi-Q factors, respectively. The method and apparatus are bit-rate and p... | 12/26/2006 |
