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

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Published on: April 1, 2020

Low sidelobe silicon optical phased array with Chebyshev amplitude distribution.

Shi Zhao¹, Daixin Lian¹, Wenlei Li¹

¹State Key Laboratory for Modern Optical Instrumentation, Center for Optical & Electromagnetic Research, International Research Center for Advanced Photonics, College of Optical Science and Engineering, Zhejiang University, Zijingang Campus, Hangzhou 310058, China.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

We developed a silicon photonic optical phased array (OPA) with ultra-low sidelobe levels using arbitrary ratio power splitters. This technology achieves significant sidelobe suppression, enabling advanced optical beam steering and ranging applications.

Keywords:

low-sidelobe arrays optical phased array silicon photonics

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Area of Science:

Photonics
Optical Engineering
Integrated Optics

Background:

Optical phased arrays (OPAs) are crucial for beam steering applications.
Achieving ultra-low sidelobe levels in OPAs is essential for improved performance.
Traditional methods for sidelobe suppression can be complex and less efficient.

Purpose of the Study:

To propose and demonstrate a silicon photonic OPA with ultra-low sidelobe levels.
To introduce arbitrary ratio power splitters (ARPSs) for amplitude manipulation and sidelobe suppression.
To experimentally validate the performance of the developed OPA for beam steering and ranging.

Main Methods:

Design and fabrication of a 32-channel silicon photonic OPA.
Utilizing arbitrary ratio power splitters (ARPSs) to control amplitude distribution.
Employing the Chebyshev method for amplitude distribution determination.
Experimental characterization of sidelobe suppression ratio (SLSR) and field of view (FOV).

Main Results:

Demonstrated an OPA with ultra-low sidelobe levels.
Achieved a sidelobe suppression ratio (SLSR) of up to 25.3 dB.
Measured a field of view (FOV) of 84° × 13° with divergence of 2.8° × 1.7°.
Successfully demonstrated frequency-modulated continuous-wave (FMCW) based ranging.

Conclusions:

The proposed silicon photonic OPA with ARPSs effectively suppresses sidelobes.
The developed OPA offers a promising platform for advanced optical beam steering and sensing.
The integration of OPA with FMCW ranging opens new possibilities for optical measurement systems.