Dynamic traffic grooming in survivable WDM networks

Yonghua Zhu; Rujian Lin

doi:10.1117/12.635465

9 December 2005 Dynamic traffic grooming in survivable WDM networks

Yonghua Zhu, Rujian Lin

Proceedings Volume 6021, Optical Transmission, Switching, and Subsystems III; 60212C (2005) https://doi.org/10.1117/12.635465
Event: Asia-Pacific Optical Communications, 2005, Shanghai, China

Abstract

This paper investigates the survivable traffic grooming problem for optical mesh networks employing wavelength-division multiplexing (WDM). While the transmission rate of a wavelength channel is high, the bandwidth requirement of a typical connection request can vary from the full wavelength capacity down to subwavelength. To efficiently utilize network resources, subwavelength-granularity connections can be groomed onto direct optical transmission channels, or lightpaths. Meanwhile, the failure of a network element can cause the failure of several lightpaths, thereby leading to large data and revenue loss. Fault-management schemes such as protection are essential to survive such failures. Different low-speed connections may request different bandwidth granularities as well as different protection schemes. How to efficiently groom such low-speed connections while satisfying their protection requirements is the main focus of our investigation. The paper tackles the dynamic survivable traffic grooming problems in multifiber wavelength-routed optical networks by representing the network as a layered graph model. This graph multi layers, where each layer represents a specific wavelength. Each link in the layered graph has more than one fibers and an associated cost. We use a modified Dijkstra algorithm that has a reduced complexity due to the structure of the layered graph. Heuristic algorithms for fiber selection based on a well-designed link-cost metrics are proposed. The performance of various routing algorithms is evaluated through simulation studies.

Citation Download Citation

Yonghua Zhu and Rujian Lin "Dynamic traffic grooming in survivable WDM networks", Proc. SPIE 6021, Optical Transmission, Switching, and Subsystems III, 60212C (9 December 2005); https://doi.org/10.1117/12.635465

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KEYWORDS

Wavelength division multiplexing

Optical fibers

Optical networks

Multiplexing

Wavelength division multiplexing networks

Networks

Switching

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