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Novel T-rail electrodes for substrate removed low-voltage high-speed GaAs/AlGaAs electrooptic modulators

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5 Author(s)
JaeHyuk Shin ; Electr. Eng. Dept., Univ. of California, Santa Barbara, CA ; Ozturk, C. ; Sakamoto, S.R. ; Chiu, Y.J.
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A novel traveling-wave electrode utilizing capacitively loaded T-rail elements was developed for low-voltage high-speed substrate-removed GaAs/AlGaAs electrooptic modulators. Electrodes with varying dimensions were fabricated and characterized. Electrode phase velocity, characteristic impedance, loss coefficient, and capacitive loading were extracted from the measured s-parameters up to 40 GHz. Electrode was also simulated using a finite-element solver. The measured and calculated electrode capacitance values were found to be in excellent agreement, showing that the electrode can be precisely designed. Approaches were outlined to provide a group velocity-matched very high-speed modulator electrode suitable for a low drive-voltage substrate-removed GaAs/AlGaAs electro-optic modulator

Published in:

Microwave Theory and Techniques, IEEE Transactions on  (Volume:53 ,  Issue: 2 )

Date of Publication:

Feb. 2005

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