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Transmission Technology: what’s the big deal? - page 27 / 46

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Gain equalization is required due to:

Amplifier gain is frequency (channel) dependent

Fiber attenuation is frequency (channel) dependent

Channels interact with each other in fiber (FWM, Raman, etc.)

Channels accumulate power variations resulting in reduced OSNR!

Gain equalization restores optimal channel power across the spectrum.

Various mechanisms are available:

Demux-VOA-Mux

Grating-LCD

Gain Equalization

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