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

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Effects of phase errors on coherent emitter arrays.

|October 2, 2010

Summary

This study analyzes how phase deviations in coherent emitter arrays affect far-field patterns. Results show impacts on intensity, Strehl ratios, and beam pointing for rectangular apertures and grids.

Area of Science:

Optics and Photonics
Electromagnetics
Array Antennas

Background:

Coherent emitter arrays are crucial for directed energy and advanced optics.
Phase deviations in emitters can degrade array performance.
Understanding these effects is vital for designing robust optical systems.

Purpose of the Study:

To investigate the impact of uncorrelated and nearest-neighbor-correlated Gaussian phase deviations on array performance.
To quantify effects on far-field intensity patterns, Strehl ratios, and beam pointing accuracy.
To analyze these effects specifically for rectangular apertures and rectangular grids.

Main Methods:

Simulations of coherent emitter arrays with controlled Gaussian phase errors.
Analysis of far-field metrics including intensity distribution, Strehl ratio, and central-lobe characteristics.

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Comparison of performance under different correlation models for phase deviations.

Main Results:

Phase deviations significantly alter far-field intensity patterns and reduce Strehl ratios.
Nearest-neighbor correlations have a distinct impact compared to uncorrelated deviations.
Central-lobe angular width and pointing accuracy are demonstrably affected by phase errors.

Conclusions:

Gaussian phase deviations, both correlated and uncorrelated, critically influence the performance of rectangular coherent arrays.
The findings provide essential data for mitigating phase error effects in optical array design.
This research aids in optimizing beam quality and pointing stability in practical applications.