Integrated photonic device for modulating the phase of a light signal

An integrated photonic device comprising:

• an input waveguide arrangement comprising an input waveguide configured to extend in an input plane, and an output waveguide arrangement comprising an output waveguide configured to extend in an output plane, wherein the output plane is parallel to or contained within the input plane;
• an input coupler optically coupled to the input waveguide, wherein the input coupler is configured to redirect a light signal out of the input waveguide and the input plane;
• a light property modifier configured to receive the light signal from the input coupler and reflect the light signal towards the output plane, wherein the light property modifier is configured to selectively adjust an optical path length of the light signal;
• and
• an output coupler optically coupled to the output waveguide, wherein the output coupler is configured to receive the reflected light signal from the light property modifier and redirect the light signal into the output waveguide and the output plane, wherein the light property modifier comprises a material having a refractive index affectable by an external signal in order to selectively adjust the optical path length of the light signal.

An integrated photonic device comprising:

• an input waveguide arrangement comprising an input waveguide configured to extend in an input plane, and an output waveguide arrangement comprising an output waveguide configured to extend in an output plane, wherein the output plane is parallel to or contained within the input plane;
• an input coupler optically coupled to the input waveguide, wherein the input coupler is configured to redirect a light signal out of the input waveguide and the input plane;
• a light property modifier configured to receive the light signal from the input coupler and reflect the light signal towards the output plane, wherein the light property modifier is configured to selectively adjust an optical path length of the light signal;
• and
• an output coupler optically coupled to the output waveguide, wherein the output coupler is configured to receive the reflected light signal from the light property modifier and redirect the light signal into the output waveguide and the output plane, wherein the input coupler is a backward scattering grating coupler and the output coupler is a backward scattering grating coupler;
• or wherein the input coupler is a backward scattering grating coupler and the output coupler is a forward scattering grating coupler or wherein the input coupler is a forward scattering grating coupler and the output coupler is a forward scattering grating coupler.