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Journal of Lightwave Technology

Journal of Lightwave Technology


  • Vol. 25, Iss. 9 — Sep. 1, 2007
  • pp: 2287–2298

Hybrid Analytical/Numerical Coupled-Mode Modeling of Guided-Wave Devices

Manfred Hammer

Journal of Lightwave Technology, Vol. 25, Issue 9, pp. 2287-2298 (2007)

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In this paper, a general version of coupled-mode theory for frequency-domain scattering problems in integrated optics is proposed. As a prerequisite, a physically reasonable field template is required, that typically combines modes of the optical channels in the structure with coefficient functions of in principle arbitrary coordinates. Upon 1-D discretizations of these amplitude functions into finite elements, a Galerkin procedure reduces the problem to a system of linear equations in the element coefficients, where given input amplitudes are included. Smooth approximate solutions are obtained by solving the system in a least squares sense. The versatility of the approach is illustrated by means of a series of 2-D examples, including a perpendicular crossing of waveguides, and a grating-assisted rectangular resonator. As an Appendix, we show that, alternatively, a similar procedure can be derived by variational means, i.e., by restricting a suitable functional representation of the full 2-D/3-D vectorial scattering problem (with transparent influx boundary conditions for inhomogeneous exterior) to the respective field templates.

© 2007 IEEE

Manfred Hammer, "Hybrid Analytical/Numerical Coupled-Mode Modeling of Guided-Wave Devices," J. Lightwave Technol. 25, 2287-2298 (2007)

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