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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...
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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...
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8078052 |
Protocol-less all-optical 1+1 bidirectional revertive linear protection system
In an optical network a 1+1 bidirectional protection system is presented. Each node across a link has photodiodes to monitor the power of signals received by the node on receiving working and...
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8050554 |
Fault localization apparatus for optical line using subcarrier multiplexing (SCM) monitoring signal and method thereof
Provided are a fault localization apparatus based on an optical communication network and a method thereof. In the fault localization apparatus according to the present invention, a downstream...
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8027583 |
Wavelength division multiplexed systems with optical performance monitors
The specification describes optical performance monitors which are simplified by coupling single tunable optical filters to multiple channels being monitored. Optical measurements for more than one...
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8027584 |
Sensing a disturbance
The present invention relates to a system for sensing of a disturbance on an optical link. Data traffic from an optical source with a short coherence length is transmitted along the link to a...
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8014670 |
Method and apparatus for testing and monitoring data communications in the presence of a coupler in an optical communications network
Some optical communications networks include one ingress fiber, an n-way signal coupler, and n egress fibers, where each fiber may carry signals in one or both directions. A method and apparatus...
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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...
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7995915 |
Method and apparatus for testing transmission lines normally propagating optical signals
Portable apparatus for measuring parameters of optical signals propagating concurrently in opposite directions in an optical transmission path between two elements, at least one of the elements...
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7945158 |
Transponder-less verification of the configuration of an optical network node
A method, apparatus, and program, for evaluating an optical network node. The method comprises providing at least one communication path of the node with a capability by which lasing can occur in...
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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...
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7885539 |
Method for detecting and localizing faults in an optical transmission path, and optical transmission system
A method for detecting and locating faults in an optical transmission path, and to an optical transmission system having such a functionality, is provided. By measuring the temporal change in the...
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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...
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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...
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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...
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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...
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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...
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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...
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7630633 |
Optical bit stream reader system and method
An all optical fiber bit stream reader system for examining the data contents of an optical fiber involving the conversion of a temporal timing signal into a spatially located signal is provided....
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7620513 |
Optical time domain reflectometer, and optical fiber measuring method and optical fiber measuring system using the same
In order to easily and efficiently carry out various characteristic evaluations of optical fibers which have been laid down, a table file which is for carrying out association of optical fibers...
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7620319 |
Passive optical network monitoring method and passive optical network
This invention relates to a method for monitoring at least one section (50) of an optical fiber link (15,16), preferably a distribution section behind a passive distribution node (10-13), of a...
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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...
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7558479 |
Analysis and control of optical communications systems
An optical communications system has a plurality of spans between a transmitter and a receiver. The receiver has optical to electrical conversion circuitry for converting the received optical...
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7542673 |
Fault localization apparatus for optical line in wavelength division multiplexed passive optical network
A fault localization apparatus for an optical line in a wavelength division multiplexed passive optical network is disclosed. The apparatus can detect light loss and fault positions as a channel...
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7536102 |
Method and apparatus for fiber optic fault locating and mapping
In accordance with the teachings of the present invention, a method and apparatus is presented for troubleshooting a fiber-optic cable. A fiber-optic, cable-troubleshooting system includes an...
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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...
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7469104 |
COTDR arrangement for an undersea optical transmission system comprising multiple cable stations and multiple transmission segments
A land-based cable station is provided for interfacing with first and second undersea transmission segments of an undersea optical transmission system. At least one first bypass optical...
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7433595 |
Optical signal transmission apparatus and optical signal transmission method
The present invention provides an optical signal transmission apparatus for carrying out bi-directional light transmission. The optical signal transmission apparatus includes: a light sending...
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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...
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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...
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7394989 |
Signal transmission device
A transmission unit of a signal transmission device includes: a transmission-side detection unit that detects image information from an inputted electrical signal; a receiving unit that receives,...
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7312435 |
Determination of a physical state of an optical device
The present invention relates to a determination of a physical state of an optical device by measuring a response signal. At least two subsequent measurements are executed. Therefore, a first...
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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...
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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...
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7260324 |
Automatic optical power management in optical communications system
An automatic optical power management system for use with an optical communications system includes a light source residing in a first circuit pack and adapted to emit light at a nominal power...
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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...
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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....
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7209664 |
Frequency agile transmitter and receiver architecture for DWDM systems
A frequency-agile optical transceiver includes a shared local oscillator (LO), a coherent optical receiver and an optical transmitter. The LO operates to generate a respective LO optical signal...
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7187860 |
Method and apparatus for detecting localized polarization dependent anomalies on optical transmission lines
The position and amount of localized polarization dependent anomalies such as polarization mode dispersion and/or polarization dependent loss may be measured by applying a polarization modulated...
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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...
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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...
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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...
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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...
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7099581 |
OTDR arrangement for detecting faults in an optical transmission system on a span by span basis
A method is provided for using optical time-domain reflectometry (OTDR) with a bi-directional optical transmission system that includes a plurality of terminals interconnected by first and second...
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7055068 |
Method for validating operation of a fibre link
A method for validating operation of a fiber link when the fiber link is initialized includes the steps of entering a trial link up state upon receiving a command to initialize the fiber link so...
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7054558 |
Method for traffic protection in WDM fiber optic transport networks
A method for the protection of fiber optic ring-shaped transport networks, the networks including network elements connected by spans, optical paths being installed between the network elements,...
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7035544 |
Identification of related communications channels in a wavelength division multiplexed optical network
Channels in an optical network that carry optical signals are evaluated using signal characteristics and suitable channels are compared to identify the channels that represent a single conversation...
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7031049 |
Loss point detecting method and distributed raman amplifier applying the same
Power of scattered light separated from an optical transmission path is monitored, part of the excitation light is separated and power thereof is monitored, power of reflected light which passes in...
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7025461 |
Interactive display system having a digital micromirror imaging device
A display system includes a waveguide optical panel having an inlet face and an opposite outlet face. A projector cooperates with a digital imaging device, e.g. a digital micromirror imaging...
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7020393 |
Method of synchronizing parallel optical links between communications components
The present invention is directed to a method of synchronizing data transmission through optical links between first and second communications components. Each of the first and second...
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