Modified finite-difference formula for the analysis of semivectorial modes in step-index optical waveguides
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概要
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The modified finite-difference formula is presented for the second derivative of a semivectorial field in a step-index optical waveguide. The present formula achieves a truncation error of O(Δx2) provided the discontinuity coincides with a mesh point or lies midway between two mesh points. Furthermore, the formula allows a general position of the interface, when used with the beam-propagation method (BPM). To demonstrate the effectiveness of the formula, asymmetric step-index waveguides are analyzed using the imaginary-distance BPM.
- IEEEの論文
- 1997-07-00
IEEE | 論文
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