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To date most research on optical networking has concentrated on wavelength-division multiplexing (WDM), which routes different packets according to the wavelength of the optical carrier. Optical time-division multiplexing (OTDM) is considered as an alternative to WDM for future networks and with single stream data rates of 100 Gb/s using a single wavelength at high (up to 100 Gbit/s) data rates [1][2][3] .In this paper we have developed a model of an all optical router based on the terahertz optical asymmetric demultiplexer (TOAD). The model architecture is based on a system which has as its input an OTDM packet containing header and payload information. The model simulates extraction of header information from the data stream using one TOAD, which is subsequently used to make a routing decision. The payload information is routed through a second TOAD according to the information contained in the header.Simulations require the use of the TOAD in two distinct modes 1). A bit level demultiplexer for the header 2). A frame level demultiplexer for the payload. Consequently less stringent requirements are required with regard to the TOAD switch resolution for payload demultiplexing compared to header demultiplexing. However, as our simulations show the wider window allowed in case 1 introduces a higher level of residual crosstalk. In case 2 the higher resolution imposes a greater restriction on the jitter present.At this stage a simple 1 by 2 router is presented, however further work will enhance the model to a network with multiple inputs and outputs.

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