Opto-acoustic signal processing

A system comprising:

• a device comprising:
• a structure configured to laterally confine travelling acoustic phonons (hypersound) throughout;
• a first multimode optical waveguide embedded within the structure;
• and
• an acoustic phonon emitter within the structure;
• wherein:
• the first multimode optical waveguide is selected to couple to the acoustic phonons (hypersound) confined within the structure;
• the acoustic phonon emitter is a second multimode optical waveguide;
• and
• the first multimode optical waveguide and the second multimode optical waveguide are optically isolated from each other as a result of different widths;
• a first light source optically coupled to a proximal end of the first multimode optical the first light source emitting a probe wave having a frequency ωp(2);
• a driver configured to drive the acoustic phonon emitter to emit acoustic phonons (hypersound);
• a second light source optically coupled to a proximal end of the second optical waveguide, the first light source emitting a pump wave having a frequency ωp(1);
• a third light source optically coupled to the proximal end of the second optical waveguide, the second light source emitting a signal wave having a frequency ωs(1);
• wherein the third light source is coupled into a different optical mode or polarization from the second light source.

A device comprising:

• a structure configured to laterally confine travelling acoustic phonons (hypersound) throughout;
• a first multimode optical waveguide embedded within the structure;
• and
• an acoustic phonon emitter within the structure;
• wherein:
• the first multimode optical waveguide is selected to couple to the acoustic phonons (hypersound) confined within the structure;
• the acoustic phonon emitter is a second multimode optical waveguide;
• and
• the first multimode optical waveguide and the second multimode optical waveguide are optically isolated from each other as a result of different widths.