An Ultracompact Directional Coupler Based on GaAs Cross-Slot Waveguide

Author

Tu, Xiaoguang ; Ang, Soo Seng Norman ; Chew, Ah Bian ; Teng, Jinghua ; Mei, Ting

Author_Institution

Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore

Volume

22

Issue

17

fYear

2010

Firstpage

1324

Lastpage

1326

Abstract

We experimentally realize a cross-slot waveguide based on GaAs-AlGaAs-GaAs substrate carrying both of transverse-electric slot mode and transverse-magnetic slot mode. A low refractive index AlO_x layer is formed between two high index GaAs layers by thermal oxidation method. A polarization splitter is obtained through a 25-μm-long ultracompact directional coupler based on the waveguide. The measured result fits well with calculation using the beam-propagation method.

Keywords

III-V semiconductors; aluminium compounds; gallium arsenide; integrated optics; light polarisation; light propagation; optical directional couplers; optical fabrication; optical waveguides; oxidation; refractive index; AlO_x; GaAs-AlGaAs-GaAs; beam propagation method; cross slot waveguide; low refractive index layer; polarization splitter; thermal oxidation method; transverse electric slot mode; transverse magnetic slot mode; ultracompact directional coupler; Directional couplers; Gallium arsenide; Integrated optics; Optical materials; Optical polarization; Optical sensors; Optical surface waves; Optical waveguides; Photonic integrated circuits; Tellurium; Integrated optics; integrated optoelectronics; optical waveguides;

fLanguage

English

Journal_Title

Photonics Technology Letters, IEEE

Publisher

ieee

ISSN

1041-1135

Type

jour

DOI

10.1109/LPT.2010.2055234

Filename

5497082