Dense Wavelength Division Multiplexing

Basics of DWDM - Up to 96 DWDM wavelength over one pair of fiber

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 multiplexer with up to 96 wavelengths

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. DWDMwavelengths are more expensive compared to CWDM caused by the need of more sophisticated transceivers.


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

Number of available C and L-Band Channels

Technical Details:

  • ITU-T G.694.1
  • C-Band λ: 1530 nm - 1565 nmmax. 360 channels (12,5 GHz Grid)
  • L-Band λ: 1565 nm - 1625 nm max. 560 channels (12,5 GHz Grid)
Contact Person
Christian Baumeister
Director International Sales
+49 6103 834 83 180


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