ROOTED ROUTING IN LINEAR LIGHTWAVE NETWORKSMilan Kova

In this paper we propose a new scheme for optical signal routing within Linear Lightwave Network (LLN) subnets. LLN is a recently proposed ber optic network which performs only linear operations on optical signals: power combining , splitting and possibly linear optical ampliication. LLN can be partitioned into several subnets where each subnet is a tree providing full broadcast among all stations connected to it. We study the synchronization problem that exists in these subnets which prevents eecient implementation of time division multiple access schemes for sharing a common broadcast medium. A solution for this problem is proposed, based on a new optical signal routing scheme, called the rooted routing. An impact of the rooted routing on power losses is analyzed, and an approach for optimizing the power losses in LLNs with the rooted routing is presented. It is shown that when the link and excess losses are small, the optimal power budget is close to the optimal power budget when the original, shortest path routing scheme is used. It is also shown that the power budget in LLNs with the rooted routing can be signiicantly improved using a single optical ampliier.