Analysis of a GaAs/AlGaAs electrooptic modulator for high-speed communications

Author

Zareen, Ismat ; Amin, Mahbub ; Alam, M. Shah ; Ahmed, Tahsin ; Karim, M. Ataul ; Rahman, Ananny

Author_Institution

Dept. of Electr. & Electron. Eng., Ahsanullah Univ. of Sci. & Technol. (AUST), Dhaka, Bangladesh

fYear

2010

fDate

18-20 Dec. 2010

Firstpage

214

Lastpage

217

Abstract

An analysis of a GaAs/AlGaAs electrooptic intensity modulator is carried out by using the finite element method. The microwave properties, e.g., the effective index, the characteristic impedance, and the frequency dependent attenuations are calculated using quasi-TEM analysis. The 3-dB optical bandwidth is estimated and it is shown that microwave losses in the dielectric material is an important factor in determining the bandwidth of the modulator. Next, to carry out the optical analysis, electrooptic effect is considered and optical mode fields and half-wavelength voltage length product is calculated using a vectorial finite element method. The results are compared with the published results and very good agreements have been found.

Keywords

III-V semiconductors; aluminium compounds; electro-optical modulation; finite element analysis; gallium arsenide; high-speed optical techniques; microwave photonics; optical communication equipment; optical losses; refractive index; GaAs-AlGaAs; dielectric material; effective index; electrooptic intensity modulator; frequency dependent attenuations; half-wavelength voltage length product; high-speed communication; impedance characteristics; microwave losses; microwave properties; quasi-TEM analysis; vectorial finite element method; 3-dB optical bandwidth; Electrooptic modulator; half-wave voltage length product; microwave analysis; optical analysis;

fLanguage

English

Publisher

ieee

Conference_Titel

Electrical and Computer Engineering (ICECE), 2010 International Conference on

Conference_Location

Dhaka

Print_ISBN

978-1-4244-6277-3

Type

conf

DOI

10.1109/ICELCE.2010.5700666

Filename

5700666