Polarisation and fibre optics and numerical Problem ebook free download pdf
A condition in which electromagnetic waves are constrained to vibrate in a certain plane or planes. Electromagnetic waves consist of vibrating electric and magnetic fields, perpendicular to the direction of motion of the wave. If the direction of vibration remains steady with time, the wave is said to be 100% linearly polarized or plane polarized in that direction. If the direction of vibration rotates at the same frequency as the wave, the wave is said to be 100% circularly polarized. Most naturally occurring electromagnetic waves have a direction of vibration that jiggles around at random: these are said to be unpolarised.