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Updated: Dec 14, 2025

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Efficient 3D silicon mode (de)multiplexer based on a sidewall-aligned vertical coupler.

Xinguo Wang, Jinye Miao, Fangyuan Cheng

|July 17, 2020

Summary

A novel 3D mode (de)multiplexer utilizing a sidewall-aligned vertical coupler achieves compact size and low crosstalk. This device enhances functionality and integration for mode division multiplexing (MDM) systems.

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Reconfigurable Microfluidic Channel with Pin-discretized Sidewalls

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Published on: April 12, 2018

Area of Science:

Photonics and optical engineering
Integrated optics
Waveguide devices

Background:

Mode division multiplexing (MDM) systems offer increased data capacity by utilizing different spatial modes.
Efficient mode (de)multiplexers are crucial for realizing practical MDM systems.
Existing designs often face challenges with size, crosstalk, and bandwidth.

Purpose of the Study:

To propose and optimize an efficient three-dimensional (3D) mode (de)multiplexer (DeMUX).
To investigate the performance of a novel dual-waveguide 3D-coupler architecture.
To demonstrate enhanced functionality and integration capabilities for MDM systems.

Main Methods:

Utilized a dual-waveguide 3D-coupler with vertically aligned silicon and poly-silicon waveguides.
Employed the full-vectorial finite element method (FEM) for analysis.
Applied the 3D full-vectorial finite difference time domain (FDTD) method for performance evaluation.

Main Results:

Achieved a compact coupling length of 6.88 µm.
Demonstrated excellent mode crosstalk of -30.04 dB.
Obtained a low insertion loss of 0.02 dB.
Reported an ultra-broad 1 dB bandwidth of 300 nm.

Conclusions:

The proposed 3D mode (De)MUX based on a sidewall-aligned vertical coupler is highly efficient.
The device shows significant potential for advancing MDM systems.
This design can lead to increased functionality and integration in optical communication networks.