Question:What is the difference between Time Division multiplexing and Wavelength Division Multiplexing.
In Wavelength Division Multiplexing, the different signals are sent along the optical fiber using different wavelengths of infrared radiation.
The individual wavelengths can be separated out by dispersion at the other end of the fiber so each signal can be read separately.
You might remember using prism to separate a beam of white light into the colours of the visible spectrum.
This is an example of dispersion, but we should say that the colours are separate according to their wavelength.
Dispersion is the separating of different colours by a prism.
In Time Division Multiplexing separate signals are broken into pieces and sent along the fiber one piece at a time with pieces of several signal interspaced regularly.