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Steve Dods
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Probably the desired effect can be achieved by changing almost any of the regions. The choice of Region 1 is partly convenience (it would not be difficult in fabrication to change the width of that region), and partly function. The outer ring (Region 2) affects dispersion according to its exposure to the modal field. That field is exponentially decreasing in the first cladding (Region 1), and so it is expected the dispersion should be sensitive to the width of Region 1. Maybe that is why the width of Region 1 was selected for modification.

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