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Thanks for the great explanation. I had not heard of G-T etalons (at least not by that name), but if I recall correctly it sounds like they must be used in the VIPA also. (Coincidently, I have met Christi Madsen, although that was very many years ago in a previous life.)

Is it fair to say the cascaded etalons are doing some sort of Fourier approximation of the fiber dispersion profile (inverted, of course) across the ITU passband? That's what I would have guessed from your note, but then you also seemed to say the compensation would be periodic *within* the ITU band (but not within channels in the ITU grid)

If you can compensate all channels, but only slope on a subset of them, what does that mean about the limitations for slope compensation?

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