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Broad-band traveling-wave modulator using a LiNbO3optical waveguide

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3 Author(s)
Izutsu, M. ; Osaka University, Osaka, Japan ; Yamane, Y. ; Sueta, T.

A traveling-wave electrooptic phase modulator using a Ti-in-diffused LiNbO3optical waveguide was designed and constructed with emphasis placed on broad-band operation. As a microwave waveguide, a coplanar parallel stripline of aluminum with characteristic impedance of 48 Ω was fabricated on the crystal surface. The electrodes are 1.5 μm thick, 1 cm long, and 60 μm apart. The modulator was tested at 0.63 μm over a bandwidth of 7.5 GHz. For 250-mW drive power, the measured phase-modulation index was 1 rad up to about 3 GHz and reduced to 0.5 tad at 7.5 GHz.

Published in:

Quantum Electronics, IEEE Journal of  (Volume:13 ,  Issue: 4 )