Analysis of grating-assisted directional couplers using the Floquet-Bloch theory

Author

Sun, Nai-Hsiang ; Butler, Jerome K. ; Evans, Gary A. ; Pang, Lily ; Congdon, Phil

Author_Institution

Southern Methodist Univ., Dallas, TX, USA

Volume

15

Issue

12

fYear

1997

fDate

12/1/1997 12:00:00 AM

Firstpage

2301

Lastpage

2315

Abstract

The Floquet-Bloch theory is used to develop a theory for grating-assisted directional couplers which predicts the coupled power and coupling lengths and is applicable to lossy waveguides. This theory views grating-assisted directional couplers as conceptually similar to conventional synchronous (nongrating) couplers. In the Floquet-Bloch analysis of the directional coupler, it is necessary to include both proper and improper space harmonics. The determination of which space harmonics are improper is critical to the understanding of the coupler performance. The choice of the improper space harmonics used for the analysis of the coupler is different from that used in contemporary papers

Keywords

diffraction gratings; harmonics; optical couplers; optical directional couplers; optical waveguide theory; Floquet-Bloch analysis; Floquet-Bloch theory; conventional synchronous nongrating couplers; coupled power; coupler performance; coupling; grating-assisted directional couplers; lossy waveguides; space harmonics; Dielectrics; Directional couplers; Gratings; Harmonic analysis; Optical scattering; Optical waveguides; Power harmonic filters; Shape; Sun; Waveguide theory;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.643560

Filename

643560