Block diagram of Optical Fiber communication system

1. The sound signals from different subscribers are multiplexed and converted into digital form by ADC/ Encoder.

2. The signal is then modulated using a pulse modulation technique and given by electrical to optical (E-O) converter. This device produce modulated optical signals.These signals are transmitted through an optical fibre to the desired destination.

3. At the receiver end, an optical detector is is employed to convert optical signals to electrical form. These signals are amplified and the modulated, decoded / demultiplex. The resultant digital signals are converted into analogue form by the digital to analog converter and given to the subscribers.