Title :
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
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;
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
DOI :
10.1109/CSNDSP.2008.4610749
