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Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

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Compact two-mode (de)multiplexer based on symmetric Y-junction and multimode interference waveguides.

Yaming Li, Chong Li, Chuanbo Li

|March 26, 2014

Summary

This study presents a compact two-mode (de)multiplexer using Y-junction and multimode interference waveguides. The device achieves a 100 nm optical bandwidth and remarkable fabrication tolerance.

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Area of Science:

Photonics and Optical Engineering
Integrated Optics
Waveguide Devices

Background:

Mode (de)multiplexers are crucial for optical communication systems.
Existing designs often lack compactness and broad operational bandwidth.
Efficiently separating or combining optical modes is essential for advanced photonic circuits.

Purpose of the Study:

To design and simulate a highly compact two-mode (de)multiplexer.
To investigate the performance characteristics, including optical bandwidth and fabrication tolerance.
To explore the phase evolution within the proposed device structure.

Main Methods:

Utilizing a 3D beam propagation method (BPM) for device design and simulation.
Employing symmetric Y-junction and multimode interference (MMI) waveguide structures.
Analyzing phase evolution to understand device operation.

Main Results:

Achieved a compact device with a length of only 48.8 μm.
Demonstrated a wide optical bandwidth of 100 nm (1500 nm to 1600 nm).
Obtained a large fabrication tolerance of ± 75 nm.

Conclusions:

The designed two-mode (de)multiplexer offers significant advantages in compactness and bandwidth.
The device shows potential for practical implementation in integrated photonic circuits.
The MMI-based approach provides a robust solution for mode (de)multiplexing applications.