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Electrode optimization for high-speed traveling-wave integrated optic modulators

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4 Author(s)
Kwok Wah Hui ; Dept. of Electron. Eng., City Univ. of Hong Kong, Hong Kong ; Kin Seng Chiang ; Boyu Wu ; Zhang, Z.H.

Different electrode configurations for LiNbO3-based Mach-Zehnder traveling-wave electrooptic modulators are analyzed. It is found that the Z-cut coplanar waveguide (CPW) configuration provides the best compromise between the characteristic impedance, the half-wave voltage, and the driving power. To increase the bandwidth and simultaneously reduce the half-wave voltage, an optimum design of multisection phase reversal electrode is proposed. To verify the theoretical predictions experimentally, two modulators, both using the Z-cut LiNbO3 CPW configuration, were fabricated and characterized, one with an optimized five-section phase reversal electrode and the other with a conventional single-section electrode. By comparing the performances of these two devices, it is confirmed that significant improvements on the bandwidth to half-wave voltage ratio and the flatness of the frequency response can indeed be obtained from using an optimized multisection phase reversal electrode

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Lightwave Technology, Journal of  (Volume:16 ,  Issue: 2 )