What is DWDM (Dense Wavelength Division Multiplexing)?
The technology for combining up to 160 wavelengths and transmitting them simultaneously onto a single fiber to be separated at the far end. DWDM uses wavelength spacing of as little as 25Ghz and requires the use of lasers with very tight tolerance and stability. The DWDM wavelength band is from roughly 1530nm to 1565nm. This is the band in which the erbium doped fiber amplifier (EDFA) will work.
