Abstract
In modern trends it has become necessary to transmit voice as well as data signals using a single channel. The communication system we have devised here transmits three voice signals and one data signal on a single fiber optic channel. The optic fiber we have used is a single mode step index plastic fiber of 1 m length and 1 mm diameter using time division multiplexing (TDM) technique where each signal is transmitted only for brief period of time. This system finds extremely large number of applications in education, industries, railways, medicine, tourism, etc. This system has been designed for four channels, of which three are audio channels and one is data channel. It is a simplex system i.e., communication is always in one direction. The transmitter does not function as receiver and vice versa.
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