Photoptics 2015 by Paulo Ribeiro & Maria Raposo

Author:Paulo Ribeiro & Maria Raposo
Language: eng
Format: epub
Publisher: Springer International Publishing, Cham

6.3.2.2 QPM Array

The millimeter-wave electric fields in the z-component between two-edges of gaps have different polarities [27]. The different polarities enable us to obtain the polarization-inversed structure for the QPM condition. The polarization-inversed structures on a z-cut EO crystal are obtainable by switching spatial relationship between the gap edge and optical waveguide along the gap-embedded patch electrodes.

In order to obtain polarization-inversed structure, meandering gaps can be adopted as shown in Fig. 6.3. The gaps are meandered on straight optical waveguide by considering transit-time effect. Therefore, it can be used for recovering optical modulation degradation due to miss-matching between millimeter-wave and lightwave electric fields.

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