Design of Electro-optical Tri-state buffer and Tri-state inverter for high speed optical interconnect

In this paper, tri-state buffer and tri-state inverter circuits using the electro-optical effect have been proposed. Both the tri-state devices have three terminals as input, output and enable. An enable terminal is used to control the direction of the flow of the input towards the output. Mach-Zehnder interferometer (MZI) is used as the switching element for the designing of the tri-state buffer and tri-state inverter. The tri-state buffer circuit transfers the data, as it is, to the desired output port and the tri-state inverter sends the inverted data to the desired output port. Using the tri-state buffer and inverter, an optical integrated circuit is proposed. To analyse the operation of the device, the performance parameters like extension ratio, insertion loss, and contrast ratio are computed and found as 26.65, 19.41 and 0.07 dB respectively.