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Transmission Technology: what’s the big deal? - page 37 / 46

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“Fixed” or “banded” OADM designs pre-determined which wavelengths are added/dropped based on static filters placed during the initial installation:

Advantages: Cheap capital costs.

Disadvantages:

Requires precise fore-knowledge of add/drop configuration

Non-flexible static configuration that is difficult to change

“Express” wavelengths in add/drop band are regen’d at OADM sites

Static OADM

TXR

ILAs

TXR

OADM

TXR

TXR

TXR

TXR

OADM

TXR

TXR

Channels are statically dropped via filters during the initial installation.

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