Relation between three mode-field-radius definitions: W(rms), W(L), and W(G).
It is proved that three mode-field-radius definitions, W(rms), W(L), and W(G), for arbitrary circularly symmetric, singlemode fiber are related as W(rms) >/= 2 W(G) >/= W(L), and the equal sign applies when and only when mode-field distribution is Gaussian. In addition, the application of this relation to fiber design is discussed.
Liang
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