Formula giving single-mode limit of optical fibre having arbitrary refractive-index profile

Formula giving single-mode limit of optical fibre having arbitrary refractive-index profile

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A relatively simple formula for calculating approximately the single-mode limit (cutoff frequency of LP11 mode) of an optical fibre having an arbitrary refractive-index profile is derived. The normalised cutoff frequencies are computed by using the derived formula for various profiles and are compared with rigorous values, showing fairly good agreement.


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