JIANG SHIJUN. Normalized cut-off frequencies of the LP11 mode in α-power fibers with a central dip[J]. Acta Optica Sinica, 1987, 7(3): 275
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A normalized mathematical model is used for describing the refractive-index profile of α-power fibers with a central dip. The cut-off characteristic of the second-order mode (LPu) is investigated by means of the power-series expansion method. Detailed normalized cut-off frequencies, which directly correspond to the actual refractive-index profile, are given. It is of advantage for theoretical design and measurement analysis of α-power single mode fibers.