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In-situ Tapering of Chalcogenide Fiber for Mid-infrared Supercontinuum Generation

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Polarization-insensitive ultra-short waveguide taper.

Jingjing Zhang, Xiaodong Shi, Zhaojian Zhang

|October 1, 2021

Summary

This summary is machine-generated.

We developed a compact, polarization-insensitive waveguide taper for photonic integrated circuits (PICs). This ultra-short device achieves high transmission efficiency and wide bandwidth for both TE and TM polarizations.

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Area of Science:

Photonics
Integrated Optics
Nanophotonics

Background:

Waveguide tapers are crucial for mode conversion in photonic integrated circuits (PICs).
Existing tapers often suffer from large footprints and polarization sensitivity, hindering PIC miniaturization and functionality.
Compact and polarization-insensitive solutions are essential for advancing PIC technology.

Purpose of the Study:

To design and demonstrate an ultra-short, polarization-insensitive waveguide taper for PICs.
To overcome the limitations of large footprints and polarization dependence in conventional tapers.
To enable efficient on-chip mode conversion for diverse photonic applications.

Main Methods:

Utilized the mode spreading and self-image principles for taper design.
Employed a multi-mode interference (MMI)-based approach.
Fabricated the designed waveguide taper for experimental validation.

Main Results:

Achieved an ultra-short taper length of 26.3 µm, significantly smaller than standard linear tapers.
Demonstrated high transmission efficiency of approximately 70%.
Exhibited a wide 1 dB bandwidth exceeding 54 nm for both TE and TM polarizations.

Conclusions:

The MMI-based waveguide taper offers a compact and efficient solution for on-chip mode conversion.
The demonstrated polarization-insensitivity broadens its applicability in complex PICs.
This advancement contributes to the development of smaller, more versatile photonic integrated circuits.