Multiplexing Categories-Cont

o    WDM MUX and DEMUX o    Very narrow bands of light from different sources are combined to make a wider band of light o    At the receiver are separated by DEMUX ¾   Mechanism of WDM o    Although the technology is very complex, the idea is very simple o    We want to combine multiple sources into one single light at the the MUX and do the reverse at the DEMUX PRISM o    Combining and Splitting of light sources is easily handled by a PRISM o    From Physics, a prism can deflect the light depending upon the angle of incidence and the frequency o    Using this technique, a MUX can be made to combine several input beams of light each containing a narrow band of frequencies into one o/p beam of a wider band of frequencies o    The DEMUX can also be made to reverse the process