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Related Experiment Video

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Published on: June 7, 2019

Adjoint-optimized metasurfaces for compact mode-division multiplexing.

Jaewon Oh¹, Kangmei Li², Jun Yang²

¹Harvard John A. Paulson School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States.

|March 21, 2022

Summary

This summary is machine-generated.

This study presents a novel metasurface cavity device for optical communications, enabling spatial mode multiplexing. This technology increases data capacity by efficiently converting light modes for fiber transmission.

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Area of Science:

Photonics and Optical Communications
Metamaterials and Nanophotonics

Background:

Optical fiber communications utilize multiplexing to boost transmission capacity.
Increasing data demands necessitate multiplexing techniques for the spatial dimension of light.

Purpose of the Study:

To introduce a novel metasurface cavity for mode-division multiplexing and demultiplexing.
To achieve efficient mode conversion and fiber coupling on a single surface without additional optics.

Main Methods:

Design of a metasurface cavity utilizing inverse design (adjoint analysis) for phase profile optimization.
Experimental demonstration of a compact, integrated metasurface-based mode multiplexer.

Main Results:

The device performs mode conversion and coupling to fibers on a single surface.
High fidelity mode conversion (up to 72%) was achieved for the first three linearly polarized spatial modes.
Demonstration in the C-band (1530-1565 nm) with three single-mode fiber inputs.

Conclusions:

A compact and integrated metasurface-based mode multiplexer was successfully demonstrated.
This technology offers a promising solution for increasing optical fiber communication capacity through spatial multiplexing.