Analysis of Bragg reflection waveguides with finite cladding: An accurate matrix method formulation

Sonali Dasgupta, Ajoy Ghatak, Bishnu P Pal

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Ideal Bragg reflection waveguides (BRWs) are assumed to have an infinitely extended periodic cladding whereas in practice, the cladding of BRWs is of a finite extent. Bloch theorem is widely used to analyze the propagation characteristics of the BRWs. Since Bloch theorem is ideally valid only for an infinitely extended periodic medium, its application to study such BRWs is an approximation. We present a matrix method for a more accurate analysis of finite-clad BRWs and estimate the extent of errors involved in the values of the propagation constant obtained by the Bloch wave formalism. The proposed method can be used to obtain the mode effective indices as well as the radiation loss of a finite-clad BRW without resorting to solving any complex transcendental equation. In addition, since the method does not inherently assume a periodic cladding, it can also be used to analyze symmetric multi-channel BRWs, chirped structures and directional couplers. © 2007 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)83-88
Number of pages6
JournalOptics Communications
Volume279
Issue number1
DOIs
Publication statusPublished - 1 Nov 2007

Keywords

  • Bloch theorem
  • Bragg reflection waveguides
  • Planar waveguides

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