TWDM multihop lightwave networks based on rotator digraphs

The time and wavelength division multiplexed (TWDM) access protocol is one of the most promising ways to exploit the enormous bandwidth in a single-mode optical fiber. We focus on constructing scalable TWDM networks based on rotator digraphs. To make the network be more economically and technically feasible and to improve the network performance, each station is equipped with multiple fixed transmitters and multiple fixed receivers. For such a network architecture, we present the optimal wavelength assignment and transmission schedule. We also study the cost performance relation and provide a scheme to support a large network site with multiple passive star couplers.