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Damian Marek
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You will notice one of the assumptions in the formula on the page containing IV is that the effective bandwidth (wavelength bandwidth divided by center wavelength) needs to be less than 100%. In your case (0.7-2.5)/1.55 is 116% which is greater. So that little helpful equation won’t help as it should.

Try increasing the time delay by an additional 0.5eE-14 s, from what I can tell that should look better.

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