Patents by Inventor Kwun Kit Leung
Kwun Kit Leung has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 8947999Abstract: Example embodiments of a method and corresponding apparatus for sharing protection resources in a reconfigurable optical add-drop multiplexer (ROADM) based mesh network are presented. The use of dedicated 1+1 methodologies for protection in a mesh network is reliable, but requires a large amount of equipment redundancy, as well as a large associated cost. According to the embodiments of the present method and apparatus, the total number of protection transponders needed to support single failures in a mesh network is reduced by implementing a preconfigured protection cycle (p-cycle) in the mesh network and configuring nodes along the p-cycle to share protection transponders. Accordingly, the embodiments of the present method and apparatus allow for reliable protection against single failures while lessening the amount of equipment redundancy and reducing the associated cost.Type: GrantFiled: December 5, 2007Date of Patent: February 3, 2015Assignee: Tellabs Operations, Inc.Inventor: Dion Kwun Kit Leung
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Patent number: 8942558Abstract: Due to demand for more network bandwidth, a need for multi-user optical network topologies has, and will continue to, increase. A method or corresponding apparatus in embodiments of the present invention provide for an availability determination tool for determining and displaying wavelength and subrate availabilities within a network. Benefits of embodiments of a tool include allowing a user to identify the availability and capacity of any wavelength on any network, via an interactive graphical user interface, such as by using three-dimensional representations. In one embodiment, the disclosed availability determination tool allows users to locate and view any combination of available wavelengths between nodes in an optical network topology, and generate graphical and tabular reports of the availability in order to maintain an efficient and organized method or apparatus for determining and controlling wavelengths in a network.Type: GrantFiled: May 15, 2013Date of Patent: January 27, 2015Assignee: Tellabs Operations, Inc.Inventors: David W. Jenkins, Ramasubramanian Anand, Hector Ayala, Dion Kwun Kit Leung, Kenneth M. Fisher
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Patent number: 8873956Abstract: Optical regenerators and amplifiers are expensive to implement and maintain. A method or corresponding apparatus in an example embodiment of the present invention relates to an optical planning tool that plans an optical network configuration by determining a plurality of costs for maintaining signal strength in corresponding network configurations including (i) a configuration of regenerators, (ii) a configuration of pre-or post-amplifiers, and (iii) a configuration of pre- and post-amplifiers in candidate locations and regenerator modules. The candidate locations for placing pre-or post-amplifiers are determined based on loss in each span, expected traffic patterns, and proposed regeneration locations along paths of expected traffic. The regeneration modules are located in locations determined based on the candidate locations. The example embodiment selects a configuration from among the network configurations as a function of the plurality of costs, helping reduce the cost of network deployment.Type: GrantFiled: April 27, 2009Date of Patent: October 28, 2014Assignee: Tellabs Operations, Inc.Inventor: Dion Kwun Kit Leung
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Publication number: 20130251360Abstract: Due to demand for more network bandwidth, a need for multi-user optical network topologies has, and will continue to, increase. A method or corresponding apparatus in embodiments of the present invention provide for an availability determination tool for determining and displaying wavelength and subrate availabilities within a network. Benefits of embodiments of a tool include allowing a user to identify the availability and capacity of any wavelength on any network, via an interactive graphical user interface, such as by using three-dimensional representations. In one embodiment, the disclosed availability determination tool allows users to locate and view any combination of available wavelengths between nodes in an optical network topology, and generate graphical and tabular reports of the availability in order to maintain an efficient and organized method or apparatus for determining and controlling wavelengths in a network.Type: ApplicationFiled: May 15, 2013Publication date: September 26, 2013Applicant: Tellabs Operations, Inc.Inventors: David W. Jenkins, Ramasubramanian Anand, Hector Ayala, Dion Kwun Kit Leung, Kenneth M. Fisher
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Patent number: 8447181Abstract: Due to demand for more network bandwidth, a need for multi-user optical network topologies has, and will continue to, increase. A method or corresponding apparatus in embodiments of the present invention provide for an availability determination tool for determining and displaying wavelength and subrate availabilities within a network. Benefits of embodiments of a tool include allowing a user to identify the availability and capacity of any wavelength on any network, via an interactive graphical user interface, such as by using three-dimensional representations. In one embodiment, the disclosed availability determination tool allows users to locate and view any combination of available wavelengths between nodes in an optical network topology, and generate graphical and tabular reports of the availability in order to maintain an efficient and organized method or apparatus for determining and controlling wavelengths in a network.Type: GrantFiled: August 15, 2008Date of Patent: May 21, 2013Assignee: Tellabs Operations, Inc.Inventors: David W. Jenkins, Ramasubramanian Anand, Hector Ayala, Dion Kwun Kit Leung, Kenneth M. Fisher
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Publication number: 20100232784Abstract: Optical networks occasionally experience a fault along a communications path. Service providers prefer to have an alternative communications path available to enable users to still communicate in a seamless manner. Accordingly, a method and corresponding apparatus for providing path protection for dedicated paths in an optical network is provided.Type: ApplicationFiled: January 27, 2010Publication date: September 16, 2010Inventors: Thomas T. Rarick, Dion Kwun Kit Leung, Jonathan B. Sadler, Digvijay Sharma, Ramesh Kuppusamy, David W. Jenkins
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Publication number: 20100040365Abstract: Optical regenerators and amplifiers are expensive to implement and maintain. A method or corresponding apparatus in an example embodiment of the present invention relates to an optical planning tool that plans an optical network configuration by determining a plurality of costs for maintaining signal strength in corresponding network configurations including (i) a configuration of regenerators, (ii) a configuration of pre- or post-amplifiers, and (iii) a configuration of pre- and post-amplifiers in candidate locations and regenerator modules. The candidate locations for placing pre- or post-amplifiers are determined based on loss in each span, expected traffic patterns, and proposed regeneration locations along paths of expected traffic. The regeneration modules are located in locations determined based on the candidate locations. The example embodiment selects a configuration from among the network configurations as a function of the plurality of costs, helping reduce the cost of network deployment.Type: ApplicationFiled: April 27, 2009Publication date: February 18, 2010Applicant: Tellabs Operations, Inc.Inventor: Dion Kwun Kit Leung
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Publication number: 20100040366Abstract: Due to demand for more network bandwidth, a need for multi-user optical network topologies has, and will continue to, increase. A method or corresponding apparatus in embodiments of the present invention provide for an availability determination tool for determining and displaying wavelength and subrate availabilities within a network. Benefits of embodiments of a tool include allowing a user to identify the availability and capacity of any wavelength on any network, via an interactive graphical user interface, such as by using three-dimensional representations. In one embodiment, the disclosed availability determination tool allows users to locate and view any combination of available wavelengths between nodes in an optical network topology, and generate graphical and tabular reports of the availability in order to maintain an efficient and organized method or apparatus for determining and controlling wavelengths in a network.Type: ApplicationFiled: August 15, 2008Publication date: February 18, 2010Applicant: Tellabs Operations, Inc.Inventors: David W. Jenkins, Ramasubramanian Anand, Hector Ayala, Dion Kwun Kit Leung, Kenneth M. Fisher
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Publication number: 20090046572Abstract: Example embodiments of a method and corresponding apparatus for sharing protection resources in a reconfigurable optical add-drop multiplexer (ROADM) based mesh network are presented. The use of dedicated 1+1 methodologies for protection in a mesh network is reliable, but requires a large amount of equipment redundancy, as well as a large associated cost. According to the embodiments of the present method and apparatus, the total number of protection transponders needed to support single failures in a mesh network is reduced by implementing a preconfigured protection cycle (p-cycle) in the mesh network and configuring nodes along the p-cycle to share protection transponders. Accordingly, the embodiments of the present method and apparatus allow for reliable protection against single failures while lessening the amount of equipment redundancy and reducing the associated cost.Type: ApplicationFiled: December 5, 2007Publication date: February 19, 2009Applicant: Tellabs Operations, Inc.Inventor: Dion Kwun Kit Leung
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Patent number: 7260059Abstract: Ongoing growth in transport demand is served while deferring or eliminating expenditure for additional capacity by reclaiming the protection capacity and inefficiently used working capacity in existing multi-ring network. Reclamation is through re-design of the routing and restoration in the network using mesh principles within the pre-existing ring capacities. The installed working and protection capacity of existing rings is viewed as a sunk investment, an existing resource, to be “mined” and incorporated into a mesh-operated network that serves both existing and ongoing growth. A complete double or even tripling of demand could be supported with little or no additional capacity investment through the period of ring-to mesh conversion by ring-mining. An existing ring set may be converted to a target architecture of “p-cycles” instead of a span-restorable mesh, through placement of straddling span interface units to convert ring ADMs to p-cycle nodal elements.Type: GrantFiled: June 28, 2002Date of Patent: August 21, 2007Assignee: Telecommunications Research LaboratoriesInventors: Wayne D. Grover, Matthieu Arnold Henri Clouqueur, Kwun Kit Leung
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Publication number: 20030016623Abstract: Ongoing growth in transport demand is served while deferring or eliminating expenditure for additional capacity by reclaiming the protection capacity and inefficiently used working capacity in existing multi-ring network. Reclamation is through re-design of the routing and restoration in the network using mesh principles within the pre-existing ring capacities. The installed working and protection capacity of existing rings is viewed as a sunk investment, an existing resource, to be “mined” and incorporated into a mesh- operated network that serves both existing and ongoing growth. Three ways of approaching the idea are given. The last is a detailed planning model for minimum cost evolution out to a given total growth multiplier (or a scenario of individual future growth multipliers on each O-D pair) that considers the costs of new mesh capacity additions, nodal costs for mesh access to existing ring working and protection capacity and selective ADM conversions and re-use decisions.Type: ApplicationFiled: June 28, 2002Publication date: January 23, 2003Applicant: Telecommunications Research LaboratoriesInventors: Wayne D. Grover, Matthieu Arnold Henri Clouqueur, Kwun Kit Leung