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| Number | Title | Issue Date |
| 8150258 | Optical transmission device and optical transmission method An optical transmission device for controlling an optical signal output includes a return light detection section for detecting return light of the optical signal transmitted via the optical transmission line; a superimposed light transmission section for generating... | 04/03/2012 |
| 8121476 | All-optical CSMA/CD apparatus in base A ethernet and the method therefor An all-optical carrier sense multiple access collision detection apparatus and method for checking by using mutual gain saturation whether distortion occurs in two or more optical signals due to mutual interference when the optical signals pass through a semiconduct... | 02/21/2012 |
| 8107812 | Dynamic range measurement and calculation of optical keyless entry sensor An optical keyless entry sensor system and method includes an optical sensor in association with a mirror that reflects light transmitted from the optical sensor, wherein reflected light is detectable by the optical sensor. An attenuation filter can be located betwe... | 01/31/2012 |
| 8095002 | Method and apparatus for diagnosing problems on a time division multiple network access (TDMA) optical distribution network (ODN) A method and corresponding apparatus for diagnosing problems on a time division multiple access (TDMA) optical distribution network (ODN) is provided. An example method may include: (i) measuring no-input signal power level on a communications path configured to car... | 01/10/2012 |
| 8009982 | Alarm surveillance for cascaded optical access A system and method is disclosed that allows real-time processing of child OPOI and rider service alarms from a parent OPOI which determines if one or more STS alarms are associated with a rider service, a child OPOI, or a parent OPOI. The system and method performs... | 08/30/2011 |
| 7941048 | Loss of signal detection An apparatus and a method for accurately detecting Loss of Optical Power (LOS) by noise power cancellation effect and optical power is measured at two output ports of an athermal periodic filter, wherein one output port in the optical frequency domain, is aligned wi... | 05/10/2011 |
| 7881607 | Methods and apparatus for identifying a passive optical network failure A method and corresponding apparatus is disclosed for determining a particular Optical Network Terminal (ONT) in a Passive Optical Network (PON) is malfunctioning by sending a continuous stream of light up a shared fiber, which results in adversely affecting communi... | 02/01/2011 |
| 7865078 | Processing of optical performance data in an optical wavelength division multiplexed communication system Optical performance measurements are taken in an optical network and displayed in a form that allows an operator to enter fault information related to the measurements, or to automatically generate fault alarms to the operator, based on processing of the measurement... | 01/04/2011 |
| 7822340 | Photodiode assembly within a fiber optic tap and methods thereof An arrangement in a fiber optic network device for analyzing a set of optical signals traversing the fiber optic network device is provided. The arrangement includes a set of ports for receiving and outputting the set of optical signals. The arrangement also include... | 10/26/2010 |
| 7756417 | Light-transmitting apparatus and wavelength-division-multiplexing communication system having optical-signal-abnormality-detecting function A light-transmitting apparatus for demultiplexing an input signal completing waveform division multiplexing into wavelength components and transmitting the wavelength components through their respective transmission lines includes a wavelength-count-detecting unit f... | 07/13/2010 |
| 7512336 | Optical failure detection using polarization Systems and methods for evaluating an optical communication link are provided. The evaluation is based on a polarization analysis of received optical power. Such an analysis is able to differentiate between received noise and received optical signal power, even for ... | 03/31/2009 |
| 7471896 | Optical transponder and method for detecting and treating errors in optical channel sublayer of the optical transponder Provided are an optical transponder that processes a G.709 frame that includes an overhead for operation, administration, and maintenance of an optical channel and an overhead for forward error correction, and a method of detecting and treating errors in optical-cha... | 12/30/2008 |
| 7428354 | System for detecting fault in optical-transmission path An optical transmission-path fault-detection system for detecting a fault in an optical-transmission path connecting an optical communications apparatus and an optical amplifier corresponding to the communications apparatus is disclosed. The system includes a first ... | 09/23/2008 |
| 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 |
| 7424221 | Optical network terminal with illegal transmission detection circuitry An optical network terminal, which includes an optical transmitter, monitors the status of the optical transmitter, such as the output or the power consumption of the optical transmitter, to determine when the optical transmitter is illegally transmitting. When an i... | 09/09/2008 |
| 7406260 | Method and system for network wide fault isolation in an optical network A method and system for network wide fault isolation in an optical network are described. A single fault in a network can produce a large number of alarms at different points in an optical network. The described method and system identify the root cause alarm while ... | 07/29/2008 |
| 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 |
| 7394981 | Optical communication management systems An optical medium, whether inside or outside an internet/telecommunications backbone, is managed using a management signal at a wavelength which is distinct from wavelengths of service signals. A multiplexer multiplexes the management signal onto the optical medium,... | 07/01/2008 |
| 7391723 | Frame-level fibre channel CRC on switching platform A method and apparatus is presented for performing a sequence-level CRC calculation on fiber channel communications within a switching platform domain. A CRC generator searches the data communication for frames that contain the type of data for which a sequence-leve... | 06/24/2008 |
| 7391720 | Local span mesh restoration (LSMR) An embodiment of the invention provides a method and apparatus for restoring a connection in a network. The connection is typically a sub network connection (SNC). In an embodiment, a failed line in a link connecting a first node and a second node is detected, where... | 06/24/2008 |
| 7389044 | Method and system for providing a signature signal in an optical network in the event of loss of a client An optical network including multiple nodes is subject to intermittent faults that may raise alarms in the system. The invention focuses on an optical network based on the Any rate architecture. A single fault such as a client failure at a node in such a network can... | 06/17/2008 |
| 7386234 | Apparatus for remotely determining fault of subscriber terminals and method thereof An apparatus for remotely determining a fault of subscriber terminals and a method thereof, and more specifically, an apparatus by which in a passive optical network (PON) system, a central office determines a remote fault of subscriber terminals, and a method there... | 06/10/2008 |
| 7382272 | System, a tool and method for communicating with a faulted circuit indicator using a remote display Provided is a system, a tool and a method for communicating with a faulted circuit indicator (FCI), the faulted circuit indicator including a detection circuit for monitoring an electrical conductor of a power system. The system includes a remote display mounted in ... | 06/03/2008 |
| 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 |
| 7369764 | Transmission line monitoring method and apparatus A transmission line monitoring apparatus includes a first optical coupling unit, a first optical dividing unit, a second optical coupling unit, a second optical dividing unit and a monitoring unit. The first optical coupling unit couples a down data signal with a fi... | 05/06/2008 |
| 7369763 | Apparatus and method for monitoring an optical transmission line An apparatus and a method for monitoring an optical transmission line. An optical pilot signal of a predetermined duration is transmitted along said optical transmission line and a return signal is sent back from a signal returner along the same transmission line co... | 05/06/2008 |
| 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 |
| 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 |
| 7355982 | Subscriber line terminal device and loopback test method The present invention provides a subscriber line terminal device, which enables identification of the cause of abnormality when abnormality is detected in remote monitoring of a subscriber line terminating device connected to the terminal device via an optical fiber... | 04/08/2008 |
| 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 |
| 7349479 | Communications system of two-wire line enhancing fail-safe performance Five electronic control units (ECU) control vehicle devices using CAN protocol. Each of ECUs is provided with a resistor and a switch for activating the resistor. A first and fifth ECUs are arranged on the leftmost and rightmost ends. Resistors of the first and fift... | 03/25/2008 |
| 7333424 | Upper layer node, lower layer node, and node control method An upper layer node is used in a multi-layer network which includes an upper layer network which performs switching and transfer in units of packets, and a lower layer network which includes optical transmission lines and optical switches and accommodate the upper l... | 02/19/2008 |
| 7326916 | Optical submarine transmission system A main line cable and a backup line cable are laid in a land portion in different routes. A land terminal station includes a break detecting unit that detects a break of the main line cable, and a path switching unit that switches a transmission path to the backup l... | 02/05/2008 |
| 7321728 | Optical waveform for use in a DWDM optical network and systems for generating and processing same An optical signal occupying one or more wavelengths. An optical data signal on each wavelength is modulated with a respective overhead (dither) signal, resulting in a respective dithered optical signal. The amplitude of a particular overhead signal used to modulate ... | 01/22/2008 |
| 7313324 | SONET outage impact measurement technique An accurate method of reporting “minutes of outage” for a SONET facility applies a set of business rules and hierarchical definitions to delete certain minutes that would otherwise be counted as “outages”. In particular, any outage minutes reported for a net... | 12/25/2007 |
| 7303373 | Wind turbine systems, monitoring systems and processes for monitoring stress in a wind turbine blade Wind turbine systems, monitoring systems, and processes for measuring stress in a wind turbine blade generally includes embedding and or disposing optical glass fibers on a surface of the wind turbine blade and monitoring light transmission through the optical glass... | 12/04/2007 |
| 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 |
| 7295776 | Optical LAN device An ring type optical LAN device includes a master node and a plurality of slave nodes that are interconnected by an optical fiber cable. A plurality of optical bypass transmission lines are provided in correspondence with each one of the slave nodes. Each of the opt... | 11/13/2007 |
| 7295782 | Control method and optical data transmission path for compensating changes in SRS-induced power exchange Control method and optical data transmission path having a device for determining the tilting of the spectrum, and having a quick control and slow control for compensating the tilting of the spectrum. ... | 11/13/2007 |
| 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 |
