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8184971 Optimization mechanism for use with an optical control plane in a DWDM network  
Methods and apparatus for efficiently utilizing an optical control plane distinct from an electronic control plane to facilitate the setup of paths in a dense wave division multiplexing network are...
8135274 System and method for fault identification in optical communication systems  
A system and method for fault identification in optical communication networks. One or more repeaters in the system includes a loop back path that couples an output a first amplifier for amplifying...
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,...
8111956 Method and apparatus for confirming optical fibers connection in optical connector  
Provided is a method for confirming optical fibers connection in a connection part in an optical connector, including: allowing light to pass through a first optical fiber and allowing cladding...
8090257 Optical communication system, optical communication apparatus, and method of monitoring fault alarm in path section detour  
The optical communication system of the present invention is constructed with a data plane and a control plane, and includes a first monitor for monitoring a path alarm on the data plane, a second...
8009983 High loss loop back for long repeater span  
Various high loss loop back (HLLB) repeater architectures are disclosed that enable selectively monitoring (e.g., measuring, analyzing, etc) of Rayleigh signals from both inbound and outbound...
7974185 Three fiber line switched ring  
A 3 fiber line switched ring (3FLSR) provides protection for (optical) transmission networking wherein N nodes are connected via 3 lines (or optical fibers) in a ring topology. Two of the three...
7957643 Method and apparatus for automatically controlling optical signal power in optical transmission systems  
A method and apparatus for controlling the power level of an optical signal includes detecting the loss of a supervisory signal counter-propagating in an optical fiber.
7945160 Method and system of monitoring a data transmission link, particularly an optical, bidirectional data transmission link  
Systems and methods for monitoring a data transmission link, especially an optical, bidirectional data transmission link, in which a digital transmit signal is transmitted on a first transmission...
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,...
7889331 Bidirectional optical module and optical time domain reflectometer equipped with the bidirectional optical module  
A bidirectional optical module according to the present invention comprises light emitting elements 110, 130 that emit light to enter an optical fiber 71, a light receiving element 190 that...
RE42095 Method for transferring utility optical signals and optical-line network  
The control of the transmission of useful optical signals on different line paths of an optical transmission device is accomplished via at least one of the following features: using signal sources...
7877009 Method and system for electrochemical impedance spectroscopy  
A method and system of measuring the spectroscopic impedance of a sensor and its immediate surroundings. The sensor is disposed on an engineered structure and is coated with a protective coating....
7873273 Apparatus for measuring the characteristics of an optical fiber  
An apparatus for measuring the characteristics of an optical fiber is provided. An optical pulse generator generates, from a coherent light, first and second optical pulses having a time interval...
7853144 Optical bench fiber optic transmitter  
The subassembly includes a laser for emitting signals towards fibers to be monitored, a passive alignment carrier, a photodetector for monitoring reflected laser signals from the fibers and for...
7848642 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...
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...
7817917 System and method for monitoring telecommunications equipment  
The present invention provides a system and method for monitoring and providing settings to nodes in a telecommunications fiber network. The method and system reviews alarm and threshold settings...
7809262 Methods, systems, and computer-readable media for determining physical layer failures  
Methods, systems, and computer-readable media provide for notifying and determining a location of a fiber cut. According to embodiments, a method for determining a location of a fiber cut in a...
7809279 System and method using differential loop gain for fault identification in line monitoring equipment  
A system and method using differential loop gain for fault analysis in line monitoring equipment. Differential loop gain data is calculated from loop gain data, and fault analysis is conducted...
7769291 Optical communication network and component therefore  
A component for an optical communication network comprises a source (6) for an optical communication signal, an output port (11) for outputting the optical communication signal on an optical...
7715718 Passive optical network optical time-domain reflectometry  
Optical Time-Domain Reflectometer (OTDR) troubleshooting of a passive optical network (PON) can be enhanced by deploying cascaded splitters, at least some of which have multiple inputs. That is, at...
7698039 Mobile communication system  
The present invention makes improvements in a mobile communication system that performs a communication via a communication network provided in a mobile body to execute a data transfer. The present...
7684695 Optical diagnostic indicator  
One apparatus embodiment includes a first light source, a second light source, and a receiver having a photodetector. The first light source emits a first signal at a nonvisible wavelength for data...
7657175 Optical communication device  
An optical communication device for detecting a defect in a standby optical fiber. An active optical output unit converts an electrical signal to an optical signal, and a standby optical output...
7561799 Optical path switching device  
An optical path switching device includes compact and unpackaged components; the components are mounted onto a single platform; and the components are coupled by luminous flux. Connection between...
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...
7555215 Optical wavelength division multiplexing access system  
A dual structure for a multiplexing section extended to an OSU is obtained without adding a dynamic function, such as an optical switch, to a W-MULDEM. The W-MULDEM of an optical wavelength...
7542674 Optical link performance monitoring  
Systems and methods for verifying performance at an intermediate point in an optical link are provided by virtue of one embodiment of the present invention. One application is locating a fault...
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...
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...
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...
7457354 Method and device of analyzing a signal transmitted via a communication link  
Technology is proposed for estimating one or more characteristics of a main signal transmitted via a communication link, wherein the main signal is composed from a number of component signals...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...
Matches 1 - 50 out of 125 1 2 3 >