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

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Estimate optimization parameters for incoherent backscatter heterodyne lidar.

B J Rye¹, R M Hardesty

¹Cooperative Institute for Research in Environmental Sciences (University of Colorado and National Oceanic and Atmospheric Administration), Environmental Technology Laboratory, 325 Broadway, Boulder, Colorado 80303, USA.

|February 12, 2008

Summary

Optimizing heterodyne lidar (light detection and ranging) requires careful tuning of experimental parameters. Optimal performance is achieved with specific signal-to-noise ratios and photocount levels for precise measurements.

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Area of Science:

Atmospheric science
Optical remote sensing
Signal processing

Background:

Heterodyne lidar systems rely on precise measurements of return power and Doppler shift.
Experimental parameters significantly influence the statistical precision of lidar estimates.
Understanding these parameters is crucial for optimizing lidar performance.

Purpose of the Study:

To investigate the conditions for optimizing statistical precision in heterodyne lidar measurements.
To analyze the impact of experimental parameters on the theoretical limits of optical measurements.
To determine optimal tuning strategies for heterodyne lidar systems.

Main Methods:

Utilized established theoretical expressions for the standard deviation of estimates.
Characterized system tuning using a degeneracy parameter (photocount per fade).
Analyzed performance of estimators with and without return signal filtering.

Main Results:

Optimal tuning for filtered estimators occurs at wideband signal-to-noise ratios below 0 dB.
Detected signal levels exceeding a single effective photocount are optimal for filtered estimators.
Unfiltered estimators show reduced precision at low signal bandwidth-range gate products.

Conclusions:

Heterodyne lidar precision is highly dependent on experimental parameter tuning.
Optimal tuning strategies can significantly improve measurement accuracy.
The minimum achievable standard deviation is notably higher than the theoretical optical limit.