DWDM (Dense Wavelength Division Multiplexing)

DWDM definition:
Up to 96 DWDM wavelength over one pair of fiber

DWDM

DWDM highlights

  • Up to 96 DWDM wavelength over one pair of fiber
  • DWDM channel spacing 0.8 nm (100 GHz grid) or 0.4 nm (50 GHz grid)
  • Distances over 1,000 km can be achieved with the use of optical amplifier
  • DWDM wavelength: 1528 nm (channel 61) to 1563 nm (channel 17)

DWDM principle

The functionality of DWDM (Dense Wavelength Division Multiplexing) resembles to the one of CWDM. The DWDM channel spacing is 0.8/0.4 nm (100 GHz/50 GHz grid). This small channel spacing allows to transmit simultaneously more information. Currently a restriction on wavelengths between 1530 nm and 1625 nm exists which corresponds to the C and L band. DWDM
wavelengths are more expensive compared to CWDM caused by the need of more sophisticated transceivers.

DWDM multiplexer

Theoretically available DWDM channels in the C and L-band depending on the channel spacing

Theoretically available DWDM channels in the C and L-band depending on the channel spacingClick on the image to enlarge

Technical Details:

  • ITU-T G.694.1
  • C-Band λ: 1530 nm - 1565 nm
    max. 360 channels (12,5 GHz Grid)
  • L-Band λ: 1565 nm - 1625 nm
    max. 560 channels (12,5 GHz Grid)

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