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Separating arbitrary free-space beams with an integrated photonic processor.

Maziyar Milanizadeh¹, SeyedMohammad SeyedinNavadeh¹, Francesco Zanetto¹

¹Department of Electronics, Information and Bioengineering, Politecnico di Milano, via Ponzio 34/5, 20133, Milano, Italy.

Light, Science & Applications

|July 5, 2022

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This summary is machine-generated.

This study demonstrates a novel adaptive multibeam receiver capable of separating and detecting overlapping free-space optical beams, even with unknown shapes and in turbulent conditions. This technology enables robust multibeam communication systems in challenging environments.

Area of Science:

Optics
Photonics
Optical Communications

Background:

Free-space optics (FSO) offers multi-channel capabilities but faces challenges with overlapping beams and unknown beam shapes due to atmospheric turbulence.
Existing FSO systems struggle with signal integrity when beams overlap or are distorted.

Purpose of the Study:

To develop and demonstrate a method for separating and detecting overlapping free-space optical beams simultaneously.
To overcome limitations imposed by unknown beam shapes and environmental perturbations in FSO systems.
To enable robust multibeam space-division multiplexing in FSO.

Main Methods:

Utilized an adaptive multibeam receiver featuring a programmable integrated photonic processor.
Employed a two-dimensional array of optical antennas to couple free-space beams to the processor.

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Demonstrated beam separation with shared wavelengths, polarizations, and unknown arriving beam shapes.

Main Results:

Successfully separated and detected pairs of free-space optical beams with negligible crosstalk.
Achieved separation of beams arriving from different directions and beams with overlapping spatial modes.
Validated performance even with deliberately introduced beam mixing and unknown beam distortions.

Conclusions:

The adaptive multibeam receiver is an enabling technology for advanced FSO systems.
This approach facilitates the transition from single-beam to multibeam FSO, enhancing capacity and reliability.
The system's wide optical bandwidth (>40 nm) supports scalable space-division multiplexing in perturbed environments.