<p> An optical time division multiplexing (TDM) scheme using soliton interaction is proposed in the thesis to save the time-bandwidth prduct (TBP). The soliton multiplexer (MUX) consisting of a highly nonlinear fiber (HNLF) combines two adjacent solitons to form a composite soliton, while the soliton demultiplexer (DEMUX) consisting of a similar HNLF restores the component solitons. The case of interaction between identical fundamental solitons is discussed first. However, when this scheme is used in the conventional TDM system, the total bit rate transmitted over the channel is limited by the time interval between the two adjacent component solitons. Therefore, a modified multiplexing scheme using interaction between different solitons is proposed to satisfy more practical engineering applications. The theoretical analysis and numerical simulation results demonstrate that the modified optical TDM scheme offers a higher TBP efficiency and suitable for conventional TDM, which makes it an attractive candidate for meeting the challenge of increasing demand on frequency bandwidth in modern optical communications. </p> / Thesis / Master of Applied Science (MASc)