Methods and apparatuses for optical and geometric parameter extraction for photonic integrated circuits

A system for obtaining photonic parameters, comprising:

• a computer that includes a processor and memory;
• an optical source constructed to emit light of a first optical mode and a second optical mode in response to an instruction by the computer;
• a first optical fiber configured to receive the first optical mode or the second optical mode from the optical source;
• a first Mach-Zehnder Interferometer structure comprising a first plurality of Mach-Zehnder Interferometers and a second plurality of Mach-Zehnder Interferometers, wherein the first Mach-Zehnder Interferometer structure is configured to receive the first optical mode or the second optical mode from the first optical fiber;
• a second Mach-Zehnder Interferometer structure comprising a third plurality of Mach-Zehnder Interferometers and a fourth plurality of Mach-Zehnder Interferometers, wherein the second Mach-Zehnder Interferometer structure is configured to receive the first optical mode or the second optical mode from the first optical fiber;
• a second optical fiber configured to receive light from the first Mach-Zehnder Interferometer structure and the second Mach-Zehnder Interferometer structure;
• and
• a detector configured to receive light that propagated through the second optical fiber, generate image data, and provide the image data to the computer,
• wherein the computer is configured to obtain a plurality of photonic parameters based on the image data and initial guesses for the plurality of photonic parameters.