Full-vectorial finite difference for optical analysis of travelling wave electroabsorption modulators

Author

Abedi, K. ; Ahmadi, V. ; Moravvej-Farshi, M.K. ; Motlagh, A. Chaman

Author_Institution

Dept. of Electr. Eng., Tarbiat Modares Univ., Tehran

fYear

2008

fDate

25-25 July 2008

Firstpage

671

Lastpage

675

Abstract

A full-vectorial finite-difference-based optical mode solver is presented to analyze travelling wave electroabsorption modulator (TWEAM). The discontinuities of the normal components of the electric field across abrupt dielectric interfaces are considered in this analysis which in contrast is the limitations of scalar and semivectorial approximation method. The optical field distributions in a ridge-type traveling-wave coplanar waveguide (CPW) electroabsorption modulator for 1.55 mum operation are presented. The important parameters in the high-frequency TWEAM design such as optical effective index which defines optical velocity and transverse mode confinement factor are calculated. Then, the effects of microwave and optical properties of waveguides on modulation response of TWEAMs are analyzed.

Keywords

coplanar waveguide components; electro-optical modulation; electroabsorption; finite difference methods; microwave photonics; optical waveguide components; CPW electroabsorption modulator; coplanar waveguide; dielectric interface; electric field; full-vectorial finite difference; optical analysis; optical field distribution; optical mode solver; travelling wave electroabsorption modulator; Absorption; Coplanar waveguides; Finite difference methods; High speed optical techniques; Optical design; Optical modulation; Optical refraction; Optical variables control; Optical waveguides; Partial differential equations;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Systems, Networks and Digital Signal Processing, 2008. CNSDSP 2008. 6th International Symposium on

Conference_Location

Graz

Print_ISBN

978-1-4244-1875-6

Electronic_ISBN

978-1-4244-1876-3

Type

conf

DOI

10.1109/CSNDSP.2008.4610749

Filename

4610749