Electronic devices with high frequency wireless communication capabilities

Wireless circuitry comprising:

• a photodiode;
• an antenna arm communicatively coupled to the photodiode;
• one or more optical paths configured to illuminate the photodiode using a first optical signal at a first wavelength and using a second optical signal at a second wavelength different than the first wavelength;
• a receiver;
• and
• a signal path that couples the photodiode to the receiver, wherein the receiver comprises an analog-to-digital converter communicatively coupled to the signal path, the one or more optical paths comprising
• a first optical path configured to convey the first optical signal, and
• a second optical path configured to convey the second optical signal.

A method of operating wireless circuitry, the method comprising:

• producing, using a photodiode, a first current on an antenna element based on a first optical signal at a first wavelength and a second optical signal at a second wavelength different than the first wavelength;
• transmitting, using the antenna element, a first radio-frequency signal based on the first current;
• conveying, using the antenna element, a second current to the photodiode based on a second radio-frequency signal incident upon the antenna element;
• and
• producing, using the photodiode, an intermediate frequency signal on a signal path based on the second current, the first optical signal, and the second optical signal.