Abstract
All-optical multifiber networks may require large and expensive optical
switches (i.e., optical switches with many inputs/outputs). To tackle this
problem, the existing approach adopts an individual
node perspective and focuses on designing the internal node architectures
that require smaller optical switches (i.e., optical switches with fewer inputs/outputs).
In this paper, we adopt an entire network
perspective and propose a logical
subnetting approach to further reduce the switch size required.
We use multiple logical subnets to compose a network, where a subnet has the
same physical topology as but smaller dimensions than the network. In each
subnet, each node has fewer incoming/outgoing fibers and hence it requires
smaller optical switches. A lightpath can be set up through any one of the
available subnets. We propose two subnetting methods: (i) homogeneous
subnetting in which all subnets are identical and (ii) heterogeneous subnetting in which different
subnets may adopt different node architectures and dimensions. Logical subnetting
has three advantages: i) the resulting network requires significantly smaller
optical switches, while its blocking probability can be nearly the same, ii)
logical subnetting can complement any existing node architectures to integrate
their respective advantages and further reduce the switch size required, and
iii) an existing network can easily be scaled up by adding additional subnets
without modifying the existing ones.
© 2009 IEEE
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