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Area of Science:

Photonics and Optical Engineering
Fiber Optics Communications

Background:

Efficient coupling between optical fibers is crucial for various photonic applications.
Existing coupling methods often suffer from sensitivity to transverse misalignment.
Photonic lanterns offer potential for mode manipulation but require mode-selectivity.

Purpose of the Study:

To demonstrate a mode-selective photonic lantern as an efficient, transverse offset-tolerant coupling mechanism.
To validate the principle of selective excitation of the fundamental mode.
To explore its potential for laser pigtailing and fiber-to-fiber coupling.

Main Methods:

Design of a photonic lantern using indium fluoride optical fibers.
Fabrication of a prototype photonic lantern.
Experimental testing at a wavelength of 3.34 μm, including transverse offset tolerance evaluation.
Comparison of experimental results with simulations.

Main Results:

Successful demonstration of a mode-selective photonic lantern.
The device exhibits excellent transverse offset tolerance.
Experimental results closely match simulation predictions, confirming device feasibility.

Conclusions:

The mode-selective photonic lantern provides an efficient and robust coupling solution.
This technology is highly promising for applications like laser pigtailing.
It enables effective coupling between different fiber types, including hollow-core and single-mode fibers.