The VIPA is not quite a G-T etalon. It's close, but the tilt and theAR coated input window in the 100% reflective side make it a very different beast. The VIPA produces angular dispersion. The G-T etalonis a phase filter and produces no angular dispersion.You could try a Fourier approximation, but I think you would run intotrouble because the harmonics have progressively smaller FSRs and correspondingly longer etalons. This composite structure adjusts thecenter frequency setting of the etalons and the reflectivity of thenon-100% mirror. These correspond to phase and amplitude from a Fourierpoint of view. Frequency is not changed, so it's not quite a Fouriertransform.The period of the composite compensator would be something like 50 GHz or 100 GHz depending on your trade off decisions. So, around each ITU point, there will be a "dispersion passband". In this "dispersion passband" (+/- 10 GHz around all ITU channels, for example), the composite dispersion compensates your fiber dispersion. Outside of this dispersion passband, all bets are off. You can create a slope compensator by slightly modifiying the free spectral range of the etalons (varying them from 95 GHz through 105 GHz for a 100 GHz version, for example). This would correct slope over the band of channels. -chris
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