In fibreoptic cable, signals are separated by
- active optic filter.
- optic signal amplifier.
- passive optic filter.
Explanation from PART66Online
Wavelength division multiplexing puts each signal on its own wavelength of light in the same fibre. At the far end, wavelength-selective filters such as thin-film interference filters or diffraction gratings pass one band and reflect the rest, routing each signal to its own receiver. These filters are passive: they contain no electronics and need no power. An amplifier raises every wavelength together and cannot separate them.
R
rajib asked · 1 Feb 2013
how come?
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