Abstract
This paper addresses the wavelength assignment issues in
interconnecting optical Local Area Networks (LANs) in which a wavelength
cannot be reused for local connections. Multiple LANs are connected using a
wavelength routing bridge that may or may not support wavelength conversion.
Static and dynamic approaches to partitioning of wavelengths for local and
global traffic are compared using analysis and simulations. Under the static
scenario, the wavelength set is partitioned into fixed sets of local
wavelengths and global wavelengths. Dynamic wavelength assignment allows all
traffic to use all the wavelengths and thus provides greater statistical
multiplexing at the expense of increased implementation complexity. It is
found that static wavelength assignment,the easiest algorithm to implement, is
significantly outperformed by dynamic algorithms. Several dynamic assignment
algorithms are developed, and architectural issues in interconnecting optical
networks are discussed. The dependence of the call blocking performance on
system parameters, such as the local and global traffic statistics, and the
number of available wavelengths is examined in detail. An elegant outcome is
development of a simple, yet accurate, model to predict approximate blocking
performance with an arbitrary number of LANs.
© 2000 IEEE
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