Fig. 2: Capacitive optical phase shifter.
From: Integrated multi-port multi-wavelength coherent optical source for beyond Tb/s optical links

a Structure of the implemented capacitive optical phase shifter. b Cross-section of the capacitive phase shifter. c Simulated effective real and imaginary parts of the refractive index as a function of the applied bias. d the profile of the magnitude of the electric field of the TE mode in the capacitive phase shifter.