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An assessment of finite difference beam propagation method

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2 Author(s)
Youngchul Chung ; Dept. of Electr. & Comput. Eng., California Univ., Santa Barbara, CA, USA ; Dagli, N.

A finite-difference beam propagation method (FD-BPM) is outlined and assessed in comparison with a conventional beam propagation method (FFT-BPM) which uses fast Fourier transformation. In the comparative study three straight waveguides with different index profiles that are frequently encountered in integrated optics are utilized. Using both methods normalized effective index values of the eigenmodes of these waveguides are calculated and compared with the exact values obtained from analytical expressions. As a further accuracy criterion, the power loss due to numerical errors when an eigenmode of a waveguide is excited is evaluated. Based on this comparison the accuracy, computational efficiency, and stability of the FD-BPM are assessed

Published in:

Quantum Electronics, IEEE Journal of  (Volume:26 ,  Issue: 8 )

Date of Publication:

Aug 1990

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