Time and Wavelength Division Multiplexed (TWDM) is one of the most promising ways to exploit the enormous bandwidth in a single-mode optical fiber. In this paper, 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 network architecture, we present the optimal wavelength assignment and transmission schedule. We also study cost performance relation and provide a scheme to to support large network size with multiple passive star couplers.