Optical communications – Multiplex – Wavelength division or frequency division
Reexamination Certificate
2005-08-09
2005-08-09
Phan, Hanh (Department: 2633)
Optical communications
Multiplex
Wavelength division or frequency division
C398S082000, C398S083000, C398S057000, C398S058000, C398S059000, C370S254000, C370S255000, C370S258000
Reexamination Certificate
active
06928245
ABSTRACT:
In accordance with a dynamic and recursive method, the number of required ADMs for a given set of light-paths in an OWDM ring network can be minimized. In one formulation of the minimum ADM problem, the method aims to create as many circular segments among the set of light-paths in the OWDM ring network as possible, and to form as few non-circular segments as possible from the remaining light-paths such that the number of shared ADMs can be maximized. In one example, the method of the invention operates in two phases: in the first phase, a dynamic and recursive searching for all the possible circular segments among the light-paths is employed, after which the concatenated circular segments are removed from further processing. Next, a reverse recursive searching among the remaining light-paths for concatenated non-circular segments with as many light-paths as possible is conducted.
REFERENCES:
patent: 6396852 (2002-05-01), Simmons
patent: 6667981 (2003-12-01), Huang
Gerstel, et al., “Wavelength Assignment in a WDM Ring to Minimize Cost of Embedded SONET Rings,” IEEE, 1998, pp. 94-101.
Gerstel, et al., “Cost Effective Traffic Grooming WDM Rings,” IEEE, 1998, pp. 69-77.
Barry, Richard A., “Models of Blocking Probability in All-Optical Networks With and Without Wavelength Changers,” IEEE Journal on Selected Areas in Communications, vol. 14, No. 5, Jun. 1996, pp. 858-867.
Ramaswami, Rajiv, et al., “Design of Logical Topologies for Wavelength-Routed Optical Networks,” IEEE Journal on Selected Areas in Communications, vol. 14., No. 5, Jun. 1996, pp. 840-851.
Nortel Networks Limited
Phan Hanh
Steubing McGuinness & Manaras LLP
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