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7627244 |
Optical transmission apparatus, continuity testing method therein, and optical transmission system
An optical transmission apparatus comprises a preamplifier controlling unit for controlling a preamplifier so that amplified spontaneous emission including all wavelength bands of a...
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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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7529480 |
Method and system for light path monitoring in an optical communication network
A method for monitoring lightpaths in an optical network comprising nodes interconnected by wavelength-multiplexed links is disclosed. Each lightpath is identified by a respective optical...
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7526200 |
Wavelength-division multiplexing optical transmitter
An optical transmission apparatus includes optical transmitters for transmitting optical signals and first monitor units for monitoring optical signals from the optical transmitters. A multiplexer...
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7522835 |
Method of testing bit error rates for a wavelength division multiplexed optical communication system
In a wavelength division multiplexed (WDM) optical communication system having optical transmitters and receivers communicating via a optical channels, the bit error rate (BER) for the optical...
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7440700 |
Apparatus for testing performance of optical transceiver
Provided is an apparatus for testing the performance of an optical transceiver by referencing various performance clocks provided by an OTU2 signal connection transceiver and an STM-64/OC-192...
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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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7339341 |
Surgical camera robot
The present invention is a miniature camera robot which can be placed entirely within an open space such as an abdominal cavity. The instant camera robot has pan and tilt capabilities, an...
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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...
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7324048 |
Wavelength division multiplexing methods and apparatus for constructing photonic beamforming networks
Methods and apparatus for constructing phased array antenna beamforming networks are provided, that allow to scan multiple beams and select appropriate sets of delay lines simultaneously. The...
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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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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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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...
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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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7155123 |
Method and apparatus for locating faults in an optical network
Method and apparatus for fault localization in an optical network using time trend correlation of end node performance parameters and intermediate node performance parameters, such as QoS and...
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7123788 |
Apparatus for monitoring optical frequencies of WDM signals
The present invention relates to a wavelength division multiplexed (WDM) apparatus for monitoring optical frequencies, allowing optical channel frequency monitoring using the crossover property of...
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7082266 |
Optical filter and apparatus and method for monitoring optical channel using the optical filter
An apparatus and method for analyzing the spectrum of a wavelength division multiplexed (WDM) optical signal, in wavelength division multiplexing (WDM) optical transmission systems, are provided....
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7068931 |
Alarm control system and method
An alarm control method allowing easy localization of a failure in an optical communications network is disclosed. An optical signal from a signal transmitter is monitored to produce an alarm...
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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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7020092 |
Method for channel adjustment of transmission signal power in a wavelength division multiplexing transmission system
For exact level balancing or signal-to-noise ratio balancing of received signals in a wave-length-division multiplex transmission system, the associated transmitted signal power levels are...
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7006765 |
Optical network monitor
An optical network monitor and a method for monitoring the optical signals of an optical network including a spectrograph that includes a detector array, a processor and outputs. The network...
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6965736 |
Method for monitoring the transmission quality of an optical transmission system, in particular of an optical wavelength-division multiplex network
A method for monitoring the transmission quality of an optical transmission system, such as, for example, an optical wavelength division-multiplex network. An amplitude histogram of an optical...
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6907196 |
Arrangement and method for testing fiber optic telecommunications circuits over dense wavelength division multiplexing (DWDM)
An arrangement and a method for testing a telecommunications circuit over Dense Wavelength Division Multiplexing (DWDM). A transmitter, which is optically coupled to the circuit, transmits a...
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6907201 |
Optical power transient control system and method
A system and method for optical power transient control and prevention in communication networks. An optical signal propagating on a network is demultiplexed into individual spectral bands, e.g. at...
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6895183 |
Optical add-drop multiplexer
An optical wavelength division coupler 11 wavelength-divides a wavelength multiplexed light to respective wavelength lights each of which is dropped to an optical gate switch 15 -i (i=1˜n) and...
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6853811 |
Dual-wave optical shared protection ring
An optical ring is provided for propagating optical signal pairs over wavelength connections between nodes. Each optical signal pair includes two signals at different wavelengths. At one or more of...
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6823138 |
Optical communications terminal station, optical signal transmission method, and optical signal increasing method in wavelength multiplexing system
An OPC generates a pump light having the wavelength λs with a power larger than a threshold for generating a nonlinear effect in an optical fiber for a main signal having the wavelengths λ 1 ...
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6751413 |
Channel mask definition for monitoring wavelength division multiplexing transmission systems
Multiple signals are monitored, for example, by an instrument used for monitoring wavelength division multiplexing (WDM) transmission systems. For each monitored frequency channel, an active mask...
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6735391 |
Automatic retrieval of wavelength-division multiplexed ring networks
The present invention relates to an automatic retrieval method of a wavelength-division multiplexed (WDM) ring network to the normal state after recovery of a failure. More specifically, the...
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6545779 |
System for dealing with faults in an optical link
A system for dealing with faults in wavelength division multiplexed (WDM) optical communications between two terminals connected by at least two optical fibers monitors the status of communications...
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6317231 |
Optical monitoring apparatus and method for network provisioning and maintenance
Optical-to-electrical and electrical-to-optical signal conversion is substantially eliminated for performance of monitoring and maintenance functions within a wavelength-division-multiplexed...
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6310702 |
Testing device for multistage multi-branch optical network
A testing device performs testing on a multistage multi-branch optical network, which contains optical lines (such as optical fibers) that are connected together at connection points (e.g., optical...
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6233078 |
Photo signal amplification transmission system
In a conventional photo signal amplification transmission system, since control is performed to make constant an output power, total output powers of all wavelengths are made constant when a...
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6185020 |
Apparatus for detecting a fault location in an optical fiber line
Disposing optical fiber gratings 10a each reflecting a wavelength λ1 which is different from a signal wavelength λs along an optical fiber line 10 at suitable intervals and positions. The...
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6101010 |
Pass-monitoring apparatus of optical network system
It is the object of the invention to detect and locate fails in the optical network by superposing monitoring signals on respective WDM optical signals in the transmitter part of the...
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6057948 |
Protection switch optical communications system
An optical communication system which includes a working communication line for carrying a wavelength division multiplexed signal having N channels and a protection line for carrying the...
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5995254 |
Wavelength division multiplexing light transmitting system
A wavelength division multiplexing light transmitting system which can monitor its transmission line. In which, one light among the signal lights to be wavelength multiplexed is defined as an...
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5978115 |
Span management system for wavelength division multiplexed network
A network communication system comprising an optical communication path and a plurality of network elements disposed along the optical communication path. A first network element coupled to the...
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5943148 |
Surveillance system of a multi-wavelength ring network
This network, intended for the transmission of information in optical form, wavelength multiplexed, comprises nodes (N1, N2) linked to each other by at least one optical fiber (F1), at least one...
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5936753 |
Optical network system
An optical network system for bidirectional transmission between a main system (e.g., central station) and a plurality of auxiliary systems (e.g., subscriber's stations). The main system outputs a...
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5933261 |
Information processing method and system
An information processing system has a plurality of nodes each including one or more CPUs that utilize monitoring of a common bus, wherein the plurality of nodes are connected to one another by a...
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5920414 |
Wavelength division multiplexing optical transmission apparatus and optical repeater
A wavelength division multiplexing optical transmission apparatus comprises an optical wavelength demultiplexer which demultiplexes, for each wavelength, the wavelength division multiplex optical...
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5867289 |
Fault detection for all-optical add-drop multiplexer
A fault detecting apparatus and method for a network node of an optical transmission system receives a wavelength division multiplexed (WDM) optical signal which includes a group of optical...
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5777761 |
System and method for photonic facility and line protection switching using wavelength translation
A system and method for photonic facility and line protection switching in an optical network to permit fault tolerant operation. The optical network comprises components whose operation is...
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5663820 |
Optical network using multiplexed payload and OAM signals
In a first node of an optical network, an OAM (operations, administration and maintenance) controller produces an electrical OAM signal to control an optical cross-connect switch. This OAM signal...
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5633741 |
Multichannel optical fiber communications
WDM optical fiber communications entails bidirectional transmission with at least two WDM channels in opposite transmission directions in a single fiber. As compared with unidirectional...
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