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| Number | Title | Issue Date |
| 8290364 | Method, optical network and network device for locating fiber events A method for locating fiber events and an optical network and network device are provided. The method for locating fiber events includes: determining the distance between an event and an OLT, measuring the optical loss of the optical channel between the OLT and an O... | 10/16/2012 |
| 8213791 | Communication light detecting device A communication light detecting device interconnecting light transmission paths and collocated therebetween, comprises: an optical coupling body including a core portion for photo coupling with the light transmission paths, and a light extracting portion for extract... | 07/03/2012 |
| 8116624 | Method and system for evaluating an optical device Light escaping from an optical path, for example via Raman or Rayleigh scattering, can provide information about how light flows in the path or about the optical path. The path can be a waveguide, an optical channel, or a fiber that may be attached to or integrated ... | 02/14/2012 |
| 7529482 | 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... | 05/05/2009 |
| 7512337 | Gigabit ethernet passive optical network having double link structure A Gigabit Ethernet passive optical network (GE-PON) having a double link structure is disclosed. The GE-PON includes an optical line terminal (OLT), a plurality of optical couplers, and a plurality of optical network units (ONUs). The OLT sets up an active link and ... | 03/31/2009 |
| 7444077 | Optical transmission system, and pumping light source stopping device and method to be used in same system An optical transmission system includes an optical signal transmitter to output optical signal, a monitoring light transmitter to generate monitoring light, an optical multiplexer to output a multiplexed signal light by multiplexing the optical signal and monitoring... | 10/28/2008 |
| 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 |
| 7428382 | System and method for performing in-service fiber optic network certification A system and method for performing an in-service optical time domain reflectometry (OTDR) and/or insertion loss (IL) measurement(s) using the same wavelength as the data traffic for point-to-point or point-to-multipoint optical fiber networks. The OTDR or IL session... | 09/23/2008 |
| 7403675 | Method of high order mode excitation for multimode intrusion detection Intrusion detection for a multimode fiber optic cable uses a light signal launched into the fiber through the low ratio leg of a tap coupler to establish a narrow spectral width, under-filled non-uniform mode field power distribution in the cable. A small portion of... | 07/22/2008 |
| 7403674 | Intrusion detection system for a multimode optical fiber using a bulk optical wavelength division multiplexer for maintaining modal power distribution Intrusion detection of one section only of a multimode fiber uses a light signal launched into the fiber at a location spaced from the source through a single mode fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in ... | 07/22/2008 |
| 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 |
| 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 |
| 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 |
| 7382739 | Method and apparatus for discovering remote nodes in an ethernet passive optical network One embodiment of the present invention provides a system that facilitates discovery of remote nodes in EPONs. The system includes a central node and at least one remote node. During operation, the system first receives a solicitation message from the central node, ... | 06/03/2008 |
| 7376293 | Remote location of active section of fiber in a multimode intrusion detection system Intrusion detection of one section only of a multimode fiber uses a light signal launched into the fiber at a location spaced from the source through a single mode fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in ... | 05/20/2008 |
| 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 |
| 7349631 | Wavelength-tunable light source and wavelength-division multiplexed transmission system using the source The present invention relates to a wavelength-tunable light source whose output wavelength can be externally controlled and a wavelength-division multiplexed transmission system using the source. A wavelength-tunable light source in accordance with the presen... | 03/25/2008 |
| 7340170 | Wavelength-division multiplexed self-healing passive optical network A wavelength-division multiplexed self-healing passive optical network is capable of detecting cut-off and deterioration of feeder fiber and distribution fiber and restoring a network with a star structure. The network includes a central office, a remote node, and a... | 03/04/2008 |
| 7340133 | Configurable dispersion compensation trimmer The invention pertains to optical fiber transmission systems, and is particularly relevant to transmission of large volumes of data over long distances at high rates. An improved apparatus achieving precise dispersion compensation in a fiber span is disclosed. In pa... | 03/04/2008 |
| 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 |
| 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 |
| 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 |
| 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 |
| 7238935 | Light detection device A light detection device for detecting an optical path position of invisible light. The detection device includes a main body and a light guide. The light guide includes a distal end functioning as a light incident portion through which the detected light enters and... | 07/03/2007 |
| 7215464 | Optical amplifier Optical amplifier which can eliminate the need for an optical detection section before an external attenuating medium, can prevent SN degradation, and can reduce power required for pumping light. An attenuation amount detection section detects an amount of signal li... | 05/08/2007 |
| 7212541 | Wavelength division multiplexed (WDM) ring passive optical network (PON) with route protection for replacement of splitter based passive optical networks A method and apparatus for low cost upgrading on demand of an optical fiber communication system without installing additional optical fiber and minimal installation of optical circuitry at destination and distribution terminals. The upgraded systems comprise an opt... | 05/01/2007 |
| 7187864 | Frequency comb analysis Methods and apparatus for generating a frequency comb and for its use in analyzing materials and in telecommunications. The frequency comb is generated by passing pulsed light from a laser through an optical fiber having a constriction. The frequency comb comprises ... | 03/06/2007 |
| 7184660 | Method and system for monitoring performance of optical network The invention describes methods and systems for monitoring the performance of an optical network by marking a group of optical signals with a set of identification tags which are unique to network characteristics. In the preferred embodiments, fiber identification (... | 02/27/2007 |
| 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 |
| 7174108 | Transmission device and repeater A transmission system is provided that recognizes occurrence of a fault efficiently so that the workability and quality of service can be improved. An optical amplifier part amplifies an optical main signal. A fault occurrence recognizing part detects a pump light u... | 02/06/2007 |
| 7170859 | Media converter with integrated local information transmission function and fault alarm signal transmission system There is provided media converter having an integrated local information transmission function and a fault alarm signal communication system for transmitting local information using a frequency outside the communication frequency bands for data signals. In the subsc... | 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 |
| 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 |
| 7155120 | Link level network protection path calculation mechanism for use in optical networks A link based network protection path calculation mechanism wherein a protection route is calculated that is guaranteed not to traverse the link it is intended to protect. The mechanism takes advantage of the fact that the same color cannot pass twice through the sam... | 12/26/2006 |
| 7153034 | Method of constructing an optical transmission line and an optical transmission line The present invention discloses an optical transmission line constructing method comprising the steps of connecting a plurality of optical fibers differing from each other in terms of a transmission characteristic; making inspection light incident on an entrance end... | 12/26/2006 |
| 7142736 | Distributed fiber sensor with interference detection and polarization state management Polarization effects are managed to provide differential timing information for localizing disturbances affecting two or more counter-propagating light signals on one or more optical waveguides passing through a detection zone. Activity can be localized to a point f... | 11/28/2006 |
| 7120324 | Intrusion detection system for use on an optical fiber using a translator of transmitted data for optimum monitoring conditions A method and system of intrusion detection system for a multimode fiber optic cable. A light signal is launched into the cable fiber to establish a narrow spectral width, under-filled non-uniform mode field power distribution in the cable. A small portion of the hig... | 10/10/2006 |
| 7113678 | Detector detecting transmission performance of optical composite cable The detector comprises a loopback unit 10 which is connected to a connector formed at one end of an optical camera cable, an optical loop fiber 11 connecting a first optical fiber 31 and a second optical fiber 32, and a short-circuit wiri... | 09/26/2006 |
| 7113698 | Fault detection and isolation in an optical network A system for detecting faults in an optical network having switching nodes and amplifier nodes is provided. According to one aspect of the system, one or more amplifier nodes are coupled between two switching nodes. Each amplifier node is capable of detecting a faul... | 09/26/2006 |
