Correct Answer - Option 1 : Antenna
Optic Fibre Communication System:
In this first the electrical signal is converted into light and then with the help of the optical fibre as a medium the information is transmitted and the electrical conversion at the receiver.
Essential elements of optical fibre communication system includes:
1) Compact light source (usually lasers)
2) Optical fibre (Medium of transmission)
3) Photodetector (For detection at receiver)
- Transmitters (Lasers or LEDs) emit in infrared regions and are used as a light source for fiber transmission.
- Being a single wavelength light source with a uniform phase, Lasers are used as a transmitter for optical fiber, i.e. the laser acts as the best source in optical communication because it is a single wavelength light source.
- Optical fibre
- Photodiodes are used as a photodetector to detect optical signals and also used as smoke detectors.
- The working principle of a photodiode is, when a photon of ample energy strikes the diode, it makes a couple of an electron-hole.
- It is mainly operated under reverse bias.
