Abstract

A guided-wave TE to TM mode converter was demonstrated in LiTaO3. The input mode is Bragg scattered from a collinear electrooptically induced wave of off-diagonal polarizability which couples the TE and TM modes. Compared with LiNbO3, LiTaO3 provides a smaller birefringence and thus a larger phase match period and larger optical bandwidth. A novel electrode structure allowed a four-phase drive of the polarizability wave with only two applied voltages. TE–TM mode conversion efficiency of 95% was demonstrated with a 103-Å optical bandwidth. Operation as a frequency shifter was confined to low conversion efficiencies due to fringing fields.

© 1988 Optical Society of America

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