Acta Optica Sinica, Volume. 19, Issue 8, 1045(1999)
An Improved WKB Method and Correction of Phase Shift
In accordance with the multilayer approach for analyzing graded-index waveguide, the WKB method is improved by correction of the phase shift term. Formulas for the improved WKB method and for calculation of phase shift are derived. Numerical results for typical refractive-index profiles (exponential, Gaussian, erfc, truncated linear) demonstrate that the present method is highly accurate up to near cut-off region.
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[in Chinese]. An Improved WKB Method and Correction of Phase Shift[J]. Acta Optica Sinica, 1999, 19(8): 1045