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| Number | Title | Issue Date |
| 8190024 | Systems and methods for wavelength scanning of in-service wavelength division multiplexing systems A testing input module for testing an in-service WDM system is provided. The testing input module includes a first light source configured to emit a first light signal to one or more empty channels of the in-service WDM system; and a tunable second light source conf... | 05/29/2012 |
| 8116626 | Optical transmission apparatus and optical attenuation amount control method In an optical transmission apparatus, levels of signal lights obtained by demultiplexing a WDM signal and corresponding to channels are detected, based on which a channel in which a signal is transmitted and a channel in which no signal is transmitted are determined... | 02/14/2012 |
| 8111988 | Method for monitoring wavelength-division multiplexed signal A method for monitoring wavelength-division multiplexed (WDM) signal for detecting signal drift of objective signals, including generation of one or more objective signals and a guard signal. The guard signal has a wavelength that is within a range defined by a guar... | 02/07/2012 |
| 8090259 | System and method for optimizing the selection of ghost channels in mitigating polarization hole burning A system and method for optimizing the selection of ghost channels to mitigate the effects of polarization hole burning in a node of an optical communication system including identifying an optical communication channel in the node for use as a ghost channel, identi... | 01/03/2012 |
| 8068730 | Wavelength division multiplex signal monitoring system and wavelength division multiplex transmission device equipped with the same A WDM signal monitoring system includes a measuring unit that measures power levels in a plurality of predetermined wavelength bands about a wavelength division multiplex signal, a waveform determination unit that determines an approximate waveform of each channel f... | 11/29/2011 |
| 7974531 | System and method for generating a visual representation of a wavelength division multiplexing optical network and nodes thereof Systems for, and methods of, generating a visual representation of a wavelength division multiplexing (WDM) optical network and nodes thereof. In one embodiment, a system for generating a visual representation of multiple nodes of a WDM optical network includes: (1)... | 07/05/2011 |
| 7945161 | Channel power pre-emphasis in wavelength division multiplex optical communication systems An iterative method for power pre-emphasis of N optical channels in a Wavelength Division Multiplex (WDM) signal in an optical communication systems in accordance with which representative Xi characteristics are defined for the channels with among the characteristic... | 05/17/2011 |
| 7929861 | Wavelength assignment in an optical WDM network The path selection and wavelength assignment to a selected path are performed by mapping the wavelength reach to the demand distribution (agile reach) resulting in a 50-60% increase in the network reach. The network reach is further increased (about 2.2 times) when ... | 04/19/2011 |
| 7881612 | Optical autodiscovery for automated logical and physical connectivity check between optical modules Optical autodiscovery is provide between two optical modules to insure that when an optical signal is coupled between the two optical module, the optical signal from a first module does not interfere with operation of a second module. The autodiscovery is implemente... | 02/01/2011 |
| 7660527 | Optical network design method In the case that a client signal having a bandwidth larger than BW divided by P exists, where the P is the number of client ports of one optical transponder card and the BW is an optical signal band, it is configured to accommodate client signals in one optical tran... | 02/09/2010 |
| 7606488 | Wavelength-division-multiplexing optical transmission system and control method thereof In a wavelength-division-multiplexing optical transmission system in which optical-node apparatuses that perform relay transmission of wavelength-division-multiplexed light are located at specified nodes in a main optical transmission path, an optical amplifier swit... | 10/20/2009 |
| 7596315 | Wavelength division multiplexing optical transmission system and transmission wavelength control method therefor In the wavelength division multiplexing optical transmission system according to the present invention, when setting the transmission wavelengths of the wavelength-variable optical transmitter in case of addition or expansion of the optical transmitter, each transmi... | 09/29/2009 |
| 7574134 | Method of determining at least one variable of a WDM optical network A method of optimizing a WDM optical ring network configuration using a genetic algorithm. Preferably, the method includes the steps of initially defining one or more parameters for a WDM optical network or portion of a WDM optical network and creating a plurality o... | 08/11/2009 |
| 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 is provided for multiplexing the optical signals from the optical tra... | 04/28/2009 |
| 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 |
| 7421199 | System and method for subcarrier modulation as supervisory channel An apparatus and method for processing a supervisory signal for optical network applications. The apparatus includes a subcarrier transmission system configured to receive a first supervisory signal and output a second supervisory signal, and an electrical-to-optica... | 09/02/2008 |
| 7412167 | System and method for limiting the transmission capacity on a data transmission path A system and method are disclosed for providing a transmission capacity on a data transmission path, wherein such data transmission capacity is provided with regard to a user on a transmission path by using at least one limiting unit. ... | 08/12/2008 |
| 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 |
| 7400830 | Quality monitoring method and apparatus for wavelength division multiplexed optical signal and optical transmission system using the same The present invention has an object to provide a technology for monitoring the quality of a WDM signal light, capable of quickly and accurately judging an occurrence of quality deterioration of signal light and a deterioration factor thereof. To this end, according ... | 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 |
| 7386231 | Method and apparatus for testing network data signals in a wavelength division multiplexed optical network A method and apparatus for testing network data signals in an optical wavelength division multiplexing network employ an optical wavelength division multiplexing function and a network analysis function to analyze the optical spectrum and extract from and insert dat... | 06/10/2008 |
| 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 |
| 7362974 | Method for planning or provisioning data transport networks A tool for static or dynamic planning of a WDM network with dedicated protection. The WDM network is represented by a layered graph having image nodes for each node of the network and horizontal arcs for each link of the network, so as to replicate in each layer the... | 04/22/2008 |
| 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 |
| 7349632 | Method of wavelength selection control and wavelength variable filter device A method of wavelength selection control is disclosed. The method includes detecting reference RF frequencies by varying the frequency of a RF signal supplied to a reference acousto-optic tunable filter with the reference RF frequencies corresponding to reference wa... | 03/25/2008 |
| 7348541 | Optical channel monitoring system with simultaneous C-band and L-band detection A monitoring system has the capability to monitor multiple signal bands simultaneously. Specifically, in one embodiment, the monitoring system can simultaneously monitor the C- and L-bands. As a result, the time to scan through the spectral band can be reduced by ha... | 03/25/2008 |
| 7343093 | Protected bidirectional WDM network An optical WDM ring network includes at least two add/drop nodes connected in a ring path. The ring path comprises only a single optical fiber arranged for bidirectional traffic between the nodes. A 2×2 switch is used in one of the add/drop nodes for switching sign... | 03/11/2008 |
| 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 |
| 7340127 | Full-band optical spectrum analyzer and method A method for optical spectrum analysis provides a tunable optical filter and scans a wavelength range of an optical signal that is larger than the free spectrum range of the tunable optical filter. The optical signal is filtered through the tunable optical filter. S... | 03/04/2008 |
| 7339725 | Optical transmission systems including optical amplifiers and methods of use therein Optical transmission systems including a plurality of optical amplifiers configured to provide optical amplification of one or more information carrying optical signal wavelengths. At least two of the optical amplifiers are operated to provide net losses or net gain... | 03/04/2008 |
| 7340187 | Optical signal monitoring method and apparatus In an optical signal monitoring method in wavelength multiplexing and an optical network, an area corresponding to a characteristic pattern of an eye pattern of an optical signal to be monitored, which characterizes a deterioration, is extracted from a database stor... | 03/04/2008 |
| 7321733 | Split-band optical transmission system and optical transmission method used therein An optical transmission system including an optical transmitting device and an optical receiving device. The optical transmitting device includes a data signal splitting section for splitting data signal information into at least two parts and generating at least tw... | 01/22/2008 |
| 7321727 | Method for network commissioning using amplified spontaneous emission (ASE) sources This invention provides a method for commissioning an optical network using internal Automatic Spontaneous Emission (ASE) light inherently present in the optical network as a light source (the ASE light source) for measuring losses inside and between nodes in the ne... | 01/22/2008 |
| 7310465 | Optical pulse time spreading device The present invention is an SSFBG with which there are few restrictions on the code that can be set and the overall length of which is short. This SSFBG has four unit FBGs the Bragg reflection wavelengths of which are λ1, λ2, λ3, ... | 12/18/2007 |
| 7308200 | Pre-emphasis control method in consideration of nonlinear deterioration A pre-emphasis control method automatically and appropriately performs the pre-emphasis of each wavelength in a wavelength division multiplexing communications system. Before instructing pre-emphasis for a transmitting unit, the optical power of an optical signal of... | 12/11/2007 |
| 7305185 | Device for integrating demultiplexing and optical channel monitoring A method for integrating power monitoring capabilities with passive demultiplexing operations, utilizing the high-order diffraction from an optical diffraction grating. The technique helps avoid insertion loss and polarization dependent loss penalties, and device si... | 12/04/2007 |
| 7302179 | Optical performance monitor using co-located switchable fiber bragg grating array The present invention provides methods and devices for optical performance monitoring using co-located switchable fiber Bragg gratings (FBGs) in conjunction with a few detectors. This arrangement combines the merit of both tunable FBG filters and discrete detectors ... | 11/27/2007 |
| 7295778 | Wavelength division multiplexed passive optical network system Disclosed is a wavelength division multiplexed passive optical network (WDM PON) system including a central office, a remote Node, and an optical fiber coupled between the central office and the remote node, wherein the central office includes an optical power split... | 11/13/2007 |
| 7292344 | Integrated spectroscopy system Integrated spectroscopy systems are disclosed. In some examples, integrated tunable detectors, using one or multiple Fabry-Perot tunable filters, are provided. Other examples use integrated tunable sources. The tunable source combines one or multiple diodes, such as... | 11/06/2007 |
| 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 |
