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Coupling light into few-mode optical fibres I: The diffraction limit.

Anthony J Horton, Joss Bland-Hawthorn

|June 18, 2009

Summary

Few-mode fibres (FMFs) offer high light coupling efficiency for astronomical instruments, similar to multimode fibres. This finding enables the use of advanced photonic devices in adaptive optics-corrected telescopes.

Area of Science:

Astronomy
Optical Engineering
Photonics

Background:

Multimode fibres are standard in astronomy due to efficient light coupling.
Photonics industry predominantly uses single-mode fibres, with limited adaptation for multimode use.
Adaptive optics (AO) are improving astronomical telescope performance, creating new demands for fibre optics.

Purpose of the Study:

To investigate the feasibility of using few-mode fibres (FMFs) in astronomical applications.
To determine if FMFs can achieve high light coupling efficiency at AO-corrected telescope foci.
To explore the potential of FMFs for future astronomical instrumentation.

Main Methods:

Characterizing light coupling efficiency into FMFs with approximately 5 guided modes.

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Comparing FMF coupling characteristics to those of traditional multimode fibres.

Simulating and analyzing light propagation in FMFs under conditions relevant to AO-corrected telescope outputs.

Main Results:

Few-mode fibres (FMFs) demonstrate high light coupling efficiency, comparable to multimode fibres.
FMFs exhibit advantageous coupling properties suitable for astronomical telescope applications.
The study confirms that FMFs can be effectively integrated into optical systems with adaptive optics.

Conclusions:

Few-mode fibres are a viable and efficient option for astronomical instrumentation at AO-corrected foci.
The high coupling efficiency of FMFs makes them suitable for advanced photonic devices in future telescopes.
This research opens possibilities for enhanced astronomical observations using FMF technology.