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Identifying hollow waveguide guidance in air-cored microstructured optical fibres
Optics Express
|May 26, 2009
Summary
Leaky modes in air-core microstructured optical fibres can be guided by a simple hollow waveguide mechanism, not just photonic band gaps. This explains fibre colouration and guides future optical fibre design.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Microstructured optical fibres (MOFs) with air cores are designed for photonic band gap (PBG) guidance.
- Understanding alternative guiding mechanisms is crucial for optimizing MOF performance.
Purpose of the Study:
- To analyze leaky modes in real air-core MOFs.
- To identify guiding mechanisms beyond PBG guidance.
- To quantitatively determine wavelength-dependent loss.
Main Methods:
- Analysis of leaky modes in fabricated air-core MOFs.
- Comparison of mode properties to hollow waveguide models.
- Experimental demonstration of observed phenomena.
Main Results:
- Supported leaky modes exhibit characteristics of simple hollow waveguides.
- These modes are largely uninfluenced by the surrounding microstructure.
- A non-PBG mechanism responsible for fibre colouration was identified and quantified.
Conclusions:
- Hollow waveguide effects play a significant role in leaky mode propagation in air-core MOFs.
- This provides an alternative explanation for observed colouration in such fibres.
- Findings impact the design and application of microstructured optical fibres.
