Velocity matching apparatus.

摘要

Velocity matching between optical signals transmitted along a light guide (13) on a lithium niobate substrate (12) and microwave signals along transmission line electrodes (16 and 17) may be improved by positioning layers of dielectric material (14 and 15) between the substrate (12) and the electrodes (16 and 17). By improving the velocity matching the bandwidth of the device may be increased.