Patent ID: 6985648

Claim:
A method of in-wafer testing of monolithic photonic integrated circuits (PICs) formed in a semiconductor wafer where each such circuit comprises two or more integrated electro-optic components, one of each in tandem forming a signal channel in the circuit, and comprising the steps of: providing a first integrated photodetector at a rear end of each signal channel and a second integrated photodetector at forward end of each signal channel; sequentially operating a first of a selected channel electro-optic component in a selected circuit to monitor light output from a channel via its first corresponding channel photodetector and adjusting its operating characteristics by detecting that channel electro-optic component output via its second corresponding channel photodetector to provide first calibration data; sequentially operating a second of a selected channel electro-optic component in the selected circuit to monitor signal output from the second selected channel electro-optic component via its second corresponding channel photodetector and adjusting its operating characteristics by detecting that channel electro-optic component output via its second corresponding channel photodetector to provide second calibration data; and thereafter storing the first and second calibration data for each circuit channel for the selected circuit for future reference.