Saturable and dispersive parity-time symmetric directional coupler: A transmission-line modelling study

Author

Phang, Sendy ; Vukovic, Ana ; Benson, T.M. ; Creagh, Stephen ; Sewell, Phillip ; Gradoni, Gabriele

Author_Institution

George Green Inst. for Electromagn. Res., Univ. of Nottingham, Nottingham, UK

fYear

2014

fDate

6-10 July 2014

Firstpage

1

Lastpage

6

Abstract

In this paper, numerical modelling of Parity-Time (PT) coupled waveguides is reported. The PT coupled waveguide structure consists of two coupled slab waveguides based on GaAs material with gain/loss material parameter models, including both dispersion and saturation. The numerical model used analyses the impact of dispersion and saturation on the eigenmode extracted by a curve fitting approach. The results show that the presence of saturation may prohibit the appearance of the threshold point above which the PT system becomes unstable.

Keywords

III-V semiconductors; coupled transmission lines; curve fitting; directional couplers; dispersion (wave); eigenvalues and eigenfunctions; gallium arsenide; GaAs; PT coupled waveguide structure; coupled slab waveguide; curve fitting approach; dispersive parity-time symmetric directional coupler; eigenmode extraction; gain-loss material parameter model; numerical modelling; saturable parity-time symmetric directional coupler; transmission-line modelling study; Curve fitting; Dispersion; Numerical models; Optical losses; Optical waveguides; Refractive index; Time-domain analysis; TLM; parity-time waveguides; saturation model;

fLanguage

English

Publisher

ieee

Conference_Titel

Transparent Optical Networks (ICTON), 2014 16th International Conference on

Conference_Location

Graz

Type

conf

DOI

10.1109/ICTON.2014.6876685

Filename

6876685