Design and analysis of completely adiabatic tapered waveguides by conformal mapping

Author

Lee, Ching-Ting ; Wu, Mount-Learn ; Sheu, Lih-Gen ; Fan, Ping-Lin ; Hsu, Jui-Ming

Author_Institution

Inst. of Opt. Sci., Nat. Central Univ., Chung-Li, Taiwan

Volume

15

Issue

2

fYear

1997

fDate

2/1/1997 12:00:00 AM

Firstpage

403

Lastpage

410

Abstract

In this study, we propose a novel equivalent-waveguide concept to design the completely adiabatic tapered waveguides. The optimal combination of taper shape and refractive-index distribution in such ideal structures is obtained by applying a series of conformal mappings to transform a single-mode straight waveguide into an equivalent tapered configuration. In an ideal taper the curved phase-front effect verifies the constant V-number concept is insufficient for designing a tapered waveguide. Also, the beam propagation method combined with the conformal mapping method is used to analyze the characteristics of light propagation in ideal structures. Simulation results predict that in the ideal taper a perfect mode-size conversion can be achieved adiabatically

Keywords

integrated optics; optical design techniques; optical waveguide theory; optical waveguides; refractive index; adiabatically; beam propagation method; completely adiabatic tapered waveguide analysis; completely adiabatic tapered waveguide design; completely adiabatic tapered waveguides; conformal mapping method; conformal mappings; constant V-number concept; curved phase-front effect; equivalent-waveguide concept; ideal structures; light propagation; optimal combination; perfect mode-size conversion; refractive-index distribution; simulation; single-mode straight waveguide transforms; taper shape; Conformal mapping; Frequency; Integrated optics; Optical devices; Optical propagation; Optical refraction; Optical variables control; Optical waveguides; Predictive models; Shape;

fLanguage

English

Journal_Title

Lightwave Technology, Journal of

Publisher

ieee

ISSN

0733-8724

Type

jour

DOI

10.1109/50.554395

Filename

554395