Topological embedding into WDM optical passive star networks with tunable transmitters of limited tuning range

Wavelength Division Multiplexing (WDM) has been widely used for studying th e performance of optical networks, especially those employing optical passi ve star couplers. Many models have been proposed for WDM on an optical pass ive star coupler, such as each station equipped with a single tunable trans mitter and a single fixed wavelength receiver, and each station with multip le tunable transmitters and multiple tunable receivers. The current technol ogy only allows the transceivers to be tunable in a small range, a fact ign ored in previous studies. In this paper, we focus on the design of WDM opti cal passive star networks with tunable transmitters of limited tuning range and fixed wavelength receivers. The limited tuning range has effects on th e maximum delay, the total number of wavelengths which can he used, and the topological embedding. Complete graphs, meshes, and hypercubes are the thr ee topologies studied in this paper. The relationship between the total num ber of wavelengths which can be utilized and the embedded topology is estab lished. The bound for the maximum delay is analyzed. The optimal embedding algorithms are given for the systems embedded with one of the three topolog ies.