Scalar coupled mode theory and variational analysis for planar SOI waveguide arrays: a detailed comparison

Kohli, Niharika; Srivastava, Sangeeta; Sharma, Enakshi K.

doi:10.1007/s11082-016-0540-z

Cited by 2 publications

(2 citation statements)

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“…The spatial Coupled Mode Theory (CMT) is a simple and effective approach widely used to model microwave and optical devices where longitudinal structure perturbations induce coupling between the modes propagating along that direction. After its original formulation [1], the CMT has been extended also to optics [2]- [19] to study the electromagnetic behavior of several fundamental devices such as directional couplers, modulators, filters and lasers. More recently, CMT has been also employed to design a wide variety of structures for different applications: multicore optical fibers for spatial division multiplexing [20], non-Hermitian waveguides [21], graphene based devices [22], optical devices with random geometrical variations [23], just to mention some examples.…”

Section: Introductionmentioning

confidence: 99%

“…The presence of large perturbations raised then doubts on the CMT applicability. So, many attempts have been done to overcome its intrinsic limits [6]- [19]. The CMT is in fact always attracting since it is simple to be implemented and fast to be run, and then quite interesting when one does not want to use time and computational power hungry numerical techniques (e.g.…”

Section: Introductionmentioning

confidence: 99%

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Assessment of the orthogonal and non-orthogonal coupled-mode theory for parallel optical waveguide couplers

2018

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The coupled-mode theory (CMT) is a powerful approach routinely used to calculate the effects of spatial mode interactions in perturbed structures, such as optical waveguides. One of its basic hypotheses requires that perturbations are weak. This is usually not the case for devices fabricated with modern semiconductor-based technologies. In this paper, the CMT is studied in these critical cases to assess its validity. Attention will be focused on the quite common case of parallel coupled waveguides. For these structures, results can in fact be compared to the exact ones, obtained using super-modes. The study will show that not all the possible expressions of the coupling coefficients are equivalent, and which one can be pragmatically used to obtain results with minimum errors with respect to exact solutions.

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