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Automated Optical Amplifier Gain Flattening

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Automated Optical Amplifier Gain Flattening

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Commonly use amplifiers such as Erbium Doped Fiber Amplifiers (EDFA) and Raman amplifiers provide optical amplification that varies with wavelength. One solution is to flatten out the powers across the transmission window by attenuating higher power channels comparatively to the lower power channels. This is more generally refrred to as a gain flattening. This note describes how a waveshaper combined with an optical spectrum analyzer (OSA) can be used to create a robust automated gain flattening system that adapts on the fly to changes in the optical power spectrum.

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