1. Voice transmission through optical fiber cable. 2. To study transmitter circuit & calculate its output power 3. To study receiver circuit & calculate its input power 4. To study the attenuation of signal between transmitter & receiver end. 5. Measurement of numerical aperture Specifications: In built IC based Fixed DC Regulated Power Supply + 6VDC/100mA. Pre amplifier stage consists of MIC (Microphone). Photo detectors, transistors,& biasing network of resistance & capacitors. Power Amplifier stages consist of impedance matching transformers, transistors & biasing network of resistance & capacitors. Output section having LED & speaker, fiber optic cable for transmission of signal. Circuit diagram is printed on glass epoxy PCB & different combination of resistance. Test point are brought out on front panel . Accessories: Adequate no of 4mm Patch Cords required for the Experiments. Microphone for Voice Transmission. Speaker for Voice Receiver End. Optical Fiber Cable 1 Meter Length.