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 |
| 7715709 | Optical switch and network system including the same The optical switch, having a plurality of ports capable of switching optical signal routes in a network in the form of light, includes a detection means for detecting information in regard to the transmission condition of an optical signal passing through each port;... | 05/11/2010 |
| 7542672 | Optical switching apparatus with optical reflection monitor and reflection monitoring system A method is provided for detecting an optical reflection position in an optical switching unit by using a measuring system. Multiple switching commands are provided in order to direct a test light to an input port and an output port of the optical switching unit. St... | 06/02/2009 |
| 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 |
| 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 |
| 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 |
| 7340163 | Signaling protocol and architecture for protection rings Transparent network elements (10) pass data in a data communication plane (24) over optical links (42) and pass control information in a control communication plane (22) over a out-of-fiber/out-of-band (OF/OB) network (44), such as... | 03/04/2008 |
| 7312918 | Optical transmission system having function of correcting noise light due to Raman amplification An optical transmission system wherein a main signal light is amplified by Raman amplification, and noise light (ASS light) produced by the Raman amplification can be corrected with a simple configuration and with high accuracy. The optical transmission system inclu... | 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 |
| 7298971 | Hybrid optical ring-mesh protection in a communication system A communication system includes nodes that exchange communications over optical fibers. In the event of a fault, the nodes implement ring protection for a first set of the communications and implement mesh protection for a second set of the communications. Ring prot... | 11/20/2007 |
| 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 |
| 7269130 | Redundant add/drop multiplexor A telecommunications node architecture is disclosed that comprises multiple switching units that are connected to transceiver banks in a novel topology to enhance the reliability of the telecommunications network. Furthermore, the architecture of the illustrative em... | 09/11/2007 |
| 7269177 | Logical star topologies for non-star networks A logical star architecture imposed on an underlying non-star network, for example a Virtual Path Ring (VPR), enhances a mesh protocol with an automatic method for Virtual Path ID (VPI) generation. The VPIs are used by the mesh protocol's inherent routing function t... | 09/11/2007 |
| 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 |
| 7257325 | Method and system for monitoring multiple optical communications lines The present invention provides a method and system for monitoring composite optical signals carried over plural fiber-optic lines within an optical network. Methods and systems in accordance with the present invention each utilize a single OPM to monitor each one of... | 08/14/2007 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7184489 | Optimization technique for layered modulation A method and apparatus for optimizing a system for transmitting a layered modulated signal is disclosed. The method comprises the steps of defining the system in terms of a set of system parameters, including an optimal power separation S between a power of a first ... | 02/27/2007 |
| 7178992 | Apparatus and method of signal detection in an optical transceiver The present invention includes an optical transceiver having a fiber module with an optical data input and an electrical data output. The fiber module further includes a signal detect output that indicates the receipt of valid optical data. A physical layer device h... | 02/20/2007 |
| 7174066 | Method and an apparatus to detect signal failure on a per wavelength basis A method and an apparatus to provide optical equipment protection have been disclosed. In one embodiment, the method includes diverting a predetermined portion of each of a plurality of optical signals to a plurality of photonic detectors within a first optical netw... | 02/06/2007 |
| 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 |
| 7164692 | Apparatus and method for transmitting 10 Gigabit Ethernet LAN signals over a transport system A computer system and method for transmitting 10 Gigabit Ethernet (10GE) LAN signals over transport systems. Standard 10GE LAN signals are generated in any client IEEE 802.3 10GE LAN compliant interface. A transceiver receives the client 10GE LAN signal in the LAN f... | 01/16/2007 |
| 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 |
| 7149426 | Optical routers and redundancy An all optical switching system which is optically switched, from the signal channel all the way to a router. Errors in the routers are detected, and indications of those errors are sent back to the optical switch. The optical switch uses a system which picks off a ... | 12/12/2006 |
| 7146091 | Method and system for automated simulation of cable failure in a network A method, system and device for simulating cable failures in a network are disclosed. In a first aspect, a plurality of optical cables which couple a plurality of devices within the network to each other are provided. The method and system includes providing at leas... | 12/05/2006 |
| 7139477 | Method and system for diverting traffic in a communication network A method for diverting communication traffic in an optical network from a first optical link extending between a first and a second locations, to a second optical link extending either directly between the first and the second locations or via a third location, whic... | 11/21/2006 |
| 7136586 | Optical communication system The invention provides an optical communication system (10) comprising a plurality of mutually interconnected bi-directional optical waveguide rings (20, 30, 40, 50, 60) in which radiation modulated with communication traffic propagates. The radiation ... | 11/14/2006 |
| 7116858 | Optical switch elements An optical switch element, methods form making an optical switch element and optical switches containing the optical switch element. The optical switch element includes a housing containing a longitudinal channel therein having a channel axis defined along a length ... | 10/03/2006 |
| 7103274 | Cross-connect apparatus An apparatus having n-number of working cross-connects for cross-connecting an n-bit input signals arriving from a plurality of input paths on a per-bit basis; n-number of first logic circuits for calculating the exclusive-ORs of each said n-bit and applying outputs... | 09/05/2006 |
| 7099583 | 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.... | 08/29/2006 |
| 7088922 | Wavelength division multiplexing optical communication system The present invention aims to provide a WDM optical communication system that can arrange efficiently optical signals of a plurality of bit rates at different wavelength spacing. To this end, for example, a basic constitution of a demultiplexing section to be applie... | 08/08/2006 |
| 7046929 | Fault detection and isolation in an optical network An apparatus and method for fault detection and isolation in an optical network is disclosed in which each node determines an appropriate response to a line fault or an equipment fault, obviating the need for a central computer to coordinate the actions of each node... | 05/16/2006 |
| 7013059 | Methods for protecting data signals which are being transmitted via optical conductors Methods for protecting data signals which are being transmitted via optical conductors are disclosed. At least one operational optical conductor set that is connected at both ends to optical switching devices is provided for the purpose of bi-directional transmissio... | 03/14/2006 |
| 7010233 | Interface device for a fiberoptic communication network and methods of using such a device The invention concerns an interface device for a fiberoptic communication network. The interface device comprises an electric circuit arrangement 32, a first receiving section 34 for receiving a first transceiver module 24 and a second receiving... | 03/07/2006 |
