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High-Accuracy WKB Analyses of alpha-Power Graded-Core Fibers

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2 Author(s)

The WKB method is an effective approach to the analyses of propagation characteristics of optical fibers. However, conventional WKB anaIyses can not be applied to close-to-cutoff modes because the effect of core-cladding boundary is not considered exactly. This paper proposes two improved WKB analyses which consider the above effect more exactly. Both of these methods are applicable to the close-to-cutoff modes. The first one is superior in accuracy (for example, relative error in cutoff frequencies ≲10-5), but applicable only to quadratic profiles. The second one is applicable to generalα -power profiles; the accuracy is poorer but tolerable for most practical purposes.

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Microwave Theory and Techniques, IEEE Transactions on  (Volume:28 ,  Issue: 8 )