A novel electrode structure of DOS is proposed by employing two asymmetrical electrodes to Z-cut LiNbO

3

at the beginning of the Y branch

resulting in considerable decrease of the crosstalk due to the increase of the intensity of the electrical field in the Y branch strongly coupling region. BPM is used to simulate the performance of this structure

it shows that compared to the symmetric electrode structure

the crosstalk decrease by 6 dB when the switching voltage is about 6 V. And it decrease to less than -20 dB when the switching voltage is between 6～9 V.