allenmoos,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?corners
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