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Characterization of SiN Integrated Optical Phased Arrays on a Wafer-Scale Test Station

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Flash phase error correction of phase shifters in the optical phased array.

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Summary

A new method rapidly measures and corrects phase errors in optical phased array (OPA) phase shifters (PS). This technique significantly reduces calibration time from hundreds of seconds to mere seconds, improving OPA performance.

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Area of Science:

Optical Engineering
Signal Processing
Array Antennas

Background:

Optical phased arrays (OPAs) require precise phase control for beam steering.
Traditional calibration methods for OPAs are time-consuming, often taking hundreds of seconds.

Purpose of the Study:

To develop a rapid and accurate method for measuring and correcting phase errors in OPA phase shifters (PS).
To significantly reduce the calibration time for OPA systems.

Main Methods:

Sequential interrogation of individual OPA phase shifters (PS).
Utilizing double ramp-like excitations for phase error measurement.
Implementing a correction algorithm based on sequential measurements.

Main Results:

Phase errors of each PS were measured and corrected in seconds.
The new method demonstrated unprecedented speed compared to recursive methods.
Excellent performance was observed in the calibration process.

Conclusions:

The developed method offers a significant advancement in OPA calibration speed and efficiency.
This rapid calibration technique is crucial for real-time OPA applications.
The approach shows high potential for practical implementation in various OPA systems.