Patent ID: 11889001
Assignee: UNITED STATES OF AMERICA AS REPRESENTED BY THE SECRETARY OF THE AIR FORCE
Field: Digital communication (Electrical engineering)
Classification: CPC H  G | IPC G  H

Claim 3:
4. The physically unclonable function device of claim 2, wherein said optical interferometers each comprise:
a first evanescent directional coupler having a first input connected to said first input waveguide and a second input connected to said second input waveguide, said first evanescent directional coupler further having a first and a second output;
a first phase shift element having an input and an output, wherein said input is connected to said first output of said first evanescent directional coupler;
a second phase shift element having an input and an output, wherein said input is connected to said second output of said first evanescent directional coupler;
a second evanescent directional coupler having a first input connected to said output of said first phase shift element, a second input connected to said output of said second phase shift element, a first output connected to said first output waveguide and a second output connected to said second waveguide output.