Multicast Routing Algorithms Based on Q-Factor Physical-Layer Constraints in Metro Networks

<para xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink"> We use novel “light-tree balancing techniques” to investigate the problem of provisioning multicast sessions in metropolitan all-optical networks. The <formula formulatype="inline"><tex Notation="TeX">Q</tex> </formula>-factor for every path of a derived light-tree is calculated taking into account several physical layer constraints in the network and using a <formula formulatype="inline"><tex Notation="TeX">Q</tex></formula>-budgeting approach. Based on the above performance, tree balancing techniques are applied to maximize the number of multicast connections that can be admitted to the network. </para>