DWDM highlights

•     Up to 90 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 resembles to the one of CWDM . Unlike to CWDM technology, the channel spacing for DWDM is 0.8/0.4 nm (100 GHz/50 GHz grid). This small channel spacing allows to transmit simultaneously much more information. Currently a restriction on wavelengths between 1530 nm and 1625 nm exists which corresponds to the C and L band. In this connection DWDM wavelengths from DWDM technology is 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

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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