Enhanced Backwards Recursive Path Computation for Multi-Area Wavelength Switched Optical Networks Under Wavelength Continuity Constraint

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Executive Summary

In the context of the future Internet, all optical wavelength switched optical networks will play an important role in either evolutionary or revolutionary design paradigms. In any paradigm, Dense Wavelength Domain Multiplexing (DWDM) is the most cost-effective technology to increase bandwidth capacity. DWDM provides the basis for a core optical transport infrastructure supporting a wide range of heterogeneous services. However, such all-optical networks raise well-known challenges such as the Wavelength Continuity Constraint (WCC). The WCC is hard to address in a multiarea scenario when provisioning an end-to-end lightpath owing to network topology hiding requirements and the limited exchange of information between areas.

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