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An Ultracompact Directional Coupler Based on GaAs Cross-Slot Waveguide

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5 Author(s)
Xiaoguang Tu ; Sch. of Electr. & Electron. Eng., Nanyang Technol. Univ., Singapore, Singapore ; Ang, S.S.N. ; Chew, A.B. ; Jinghua Teng
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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 AlOx 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.

Published in:

Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 17 )

Date of Publication:

Sept.1, 2010

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