A zeroth-order modification of coupled mode theory for waveguide gratings

Seyedeh Mahsa Kamali, Ehsan Arbabi, Lynford L. Goddard

Research output: Contribution to journalArticlepeer-review


This letter demonstrates the importance of selecting the correct unperturbed structure for coupled mode theory calculations of waveguide gratings. Neglecting the spatial dependence of the average value of the perturbation can cause considerable inaccuracies in the analysis of many common structures. Here, we show the improvement that can be achieved by including this zeroth-order modification and how to choose the proper unperturbed structure through several practical device examples.

Original languageEnglish (US)
Article number7010020
Pages (from-to)790-793
Number of pages4
JournalIEEE Photonics Technology Letters
Issue number7
StatePublished - Apr 1 2015


  • Bragg gratings
  • Computational
  • Distributed feedback devices
  • Optical Waveguides
  • electromagnetics

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Electrical and Electronic Engineering


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