2011•Fiber & Integrated OpticsRequires access

Effect of On-Axis Dip in Refractive-Index Profile on the Cutoff Frequency of Modes of Few Mode Fibers: A Numerical Approach

Saraswati Behera, S. I. Hosain, Puspalata Pattojoshi

Abstract

The normalized cutoff frequencies of the linearly polarized (LP) modes of a graded-index few mode fiber have been calculated as a function of profile shape parameters using a simple numerical method. The effect of refractive-index dip on these cutoff frequencies and on the order of appearance of these modes has been investigated. The presence of dip causes an increase in the cutoff V values of all the modes, and the maximum shift in the cutoff V value is found to be even 20% for some modes. The order of appearance of some modes also gets drastically affected.

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Key concepts: Cutoff, Cutoff frequency, Refractive index, Optics, Mode (computer interface), Step-index profile, Normalized frequency (unit), Physics