can any one brifely explain about RADAR COMMUNICATION AND OPTICAL FIBER COMMUNICATION?

Answer 1

The main difference between the two systems is that radar is using a wide beam of energy to track objects that are moving. The kind of information that radar is getting is about calculating things in space, or 3 dimensions.

In contrast optical fiber communication is really just about transferring raw information from one static point to another.

See source for diagram comparing the two.

Answer 2

This is a VERY large question and the answer could take 100 pages.

Better way is to read a book like :
Communication and Radar Systems by Nicolaos Tzannes


This is a brief answer
Every commercial flight is equipped with a transponder. This electronic device is connected to the on-board computer. It transmits coded radio signals to the controller's radar receiver. These signals contain information about the flight: aircraft's identification letters or flight number and its altitude. Upon departure, pilots receive a 4-digit transponder code and set their transponder to that code. The terminology is "Squawk" 1200. The standard transponder code for VFR flights is 1200. When the code is set, the radar "blip" for that flight shows as an enhanced signal on the controller's radar screen. The aircraft is shown in motion on the screen and is followed by a box with the flight's information in itthe data block. This way controllers can visually track each flight as it flies through their designated airspace.

FOr optical fiber see
http://en.wikipedia.org/wiki/Optical_fiber