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Extreme large mode area in single-mode pixelated Bragg fiber
Optics Express
|November 3, 2017
Summary
Researchers developed a large-core all-solid photonic bandgap fiber with a record effective mode area. This novel fiber exhibits robust single-mode behavior, paving the way for advanced optical applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Photonic bandgap fibers (PBFs) are crucial for advanced optical applications.
- Achieving large effective mode areas while maintaining single-mode operation is a significant challenge.
Purpose of the Study:
- To design and fabricate an all-solid PBF with a large core diameter and high effective mode area.
- To ensure robust single-mode operation over practical propagation lengths.
Main Methods:
- Utilized a pixelated Bragg fiber geometry.
- Incorporated heterostructuration of the cladding.
- Applied a generalized half wave stack condition to higher-order modes.
Main Results:
- Fabricated an all-solid PBF with a core diameter > 100 µm.
- Achieved a record effective mode area of ~3700 µm² at 1035 nm.
- Demonstrated robust single-mode behavior for propagation lengths as short as 90 cm.
Conclusions:
- The developed PBF design successfully combines large mode area with single-mode operation.
- The pixelated Bragg fiber geometry and heterostructuration are effective for achieving desired optical properties.
- Experimental results validate the numerical approach for designing such fibers.
