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Transmission Technology: what’s the big deal? - page 36 / 46

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On LH or ULH systems, OADMs are utilized to add and/or drop wavelengths at intermediate sites (non-terminals) while allowing “express” wavelengths to continue in the optical domain.

Optical Add/Drop Multiplexers (OADM)

TXR

ILAs

TXR

OADM

TXR

TXR

TXR

TXR

OADM

TXR

TXR

There are two basic types of OADM architectures:

Static (a.k.a. “Fixed” or “Banded”)

Dynamic

Terminal

Terminal

Site “A”

Site “B”

Site “C”

Site “D”

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