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A modified ray-optic method for arbitrary dielectric waveguides

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2 Author(s)
Li Qiao ; Dept. of Phys., Northern Jiaotong Univ., Beijing, China ; Jingyi Wang

A modified ray-optic method (MRO) is proposed for evaluating the propagation characteristics of dielectric waveguides with arbitrary refractive index profile. The authors correct the error caused by assuming a constant phase shift for any mode at the turning point on the substrate side. Very simple formulas are given for calculating the dispersion characteristics including those for planar optical waveguides and single-mode fibers. The results are more accurate than those of the ordinary ray-optic method, especially in the near cutoff regions, and agree well with those of the exact numerical methods. A comparison with other analytical and the exact numerical methods shows that the proposed method is simpler than other methods. This method can be extended to other more complicated cases

Published in:

Quantum Electronics, IEEE Journal of  (Volume:28 ,  Issue: 12 )

Date of Publication:

Dec 1992

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