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Compact and broadband silicon polarization splitter-rotator using adiabaticity engineering.

Yung-Jr Hung, Chih-Hsien Chen, Hung-Ching Chung

|April 1, 2024

Summary

We developed a compact silicon polarization splitter-rotator (PSR) using adiabaticity engineering (AE) for shorter device length. This broadband device achieves low polarization crosstalk, ideal for silicon photonics applications.

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Area of Science:

Photonics
Materials Science
Electrical Engineering

Background:

Polarization-sensitive optical components are crucial in integrated photonics.
Existing polarization splitter-rotators (PSRs) often suffer from large footprints or limited bandwidth.

Purpose of the Study:

To propose and demonstrate a novel, short, and broadband silicon mode-conversion polarization splitter-rotator (PSR).
To leverage adiabaticity engineering (AE) for enhanced device performance and reduced length.

Main Methods:

Device design utilizing a mode-conversion taper and an adiabatic coupler-based mode sorter.
Optimization through adiabaticity engineering (AE) to control adiabaticity parameter distribution.
Fabrication on standard silicon photonics platforms with a single patterning step.

Main Results:

Achieved a compact PSR with a total length of 85 µm.
Demonstrated low polarization crosstalk (< -20 dB for TE, < -15 dB for TM) across the O-band.
Exhibited low polarization crosstalk (< -15 dB) over an 81 nm bandwidth in the O-band.
Cross-wafer measurements confirmed good fabrication tolerance.

Conclusions:

The proposed AE-optimized silicon PSR offers a compact and broadband solution for polarization management.
The design's compatibility with standard silicon photonics processes and single patterning step facilitate integration.
The device demonstrates excellent performance metrics, including low crosstalk and good fabrication tolerance.