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

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Published on: May 27, 2013

Efficient planar fiber-to-chip coupler based on two-stage adiabatic evolution.

Anatol Khilo¹, Milos A Popović, Mohammad Araghchini

¹Department of Electrical Engineering and Computer Science and Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA. anatoly@mit.edu

|August 20, 2010

Summary

This summary is machine-generated.

A novel fiber-to-chip coupler design uses a two-stage adiabatic process to significantly reduce device length while maintaining high efficiency. This innovation is key for compact photonic integrated circuits.

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Area of Science:

Photonics
Integrated Optics
Waveguide Technology

Background:

Efficient coupling between optical fibers and integrated photonic chips is crucial for optical communication and sensing.
Existing fiber-to-chip couplers often face trade-offs between coupling efficiency, device length, and fabrication complexity.

Purpose of the Study:

To propose and theoretically analyze a new, efficient adiabatic in-plane fiber-to-chip coupler design.
To demonstrate significant length reduction compared to conventional designs while preserving high coupling efficiency.

Main Methods:

The proposed design utilizes a two-stage adiabatic mode transformation.
A low-index waveguide with a rib taper is used to match the fiber mode size.
An inverse taper transfers the mode into a high-index (e.g., silicon) waveguide.

Main Results:

The two-stage adiabatic design enables substantial reduction in coupler length compared to pure inverse taper couplers.
The degree of length reduction is dependent on the refractive index of the low-index waveguide and the fiber mode size.
High coupling efficiency is maintained throughout the adiabatic transformation process.

Conclusions:

The proposed adiabatic in-plane fiber-to-chip coupler offers a promising solution for miniaturizing photonic integrated circuits.
This design facilitates reduced device footprint without compromising optical performance.
The design's scalability and efficiency make it suitable for various photonic applications.