Abstract
A low loss ultra wide bandwidth electro-optic polarization converter/modulator was realized on a GaAs/AlGaAs substrate. The device uses slow wave coplanar strip electrodes to match the phase velocity of optical and microwave signals to increase the modulation bandwidth. Microwave measurements show an electrical bandwidth in excess of 40 GHz. Microwave loss of the electrode is dB/cm at 40 GHz and the phase velocity of microwave signal is 8.6 cm/nsec and flat over the measured frequency range. The phase velocity mismatch between the optical and electrical signal is less than 5 percent. Electro-optic modulation was performed up to 22 GHz and no roll-off was observed in this frequency range.
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