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Multi-trench fiber with four gaps for improved bend performance.
Applied Optics
|October 20, 2015
Summary
A novel modified multi-trench fiber (MTF) design with leakage channels enhances single-mode operation and bending resistance. This fiber design offers improved fabrication tolerance and high loss ratios for optical applications.
Area of Science:
- Photonics and Optical Engineering
- Materials Science
Background:
- Standard multi-trench fibers (MTFs) face challenges in achieving robust single-mode operation and bending resistance.
- Fabrication accuracy for MTFs can be a limiting factor in their practical application.
Purpose of the Study:
- To propose and numerically investigate a modified multi-trench fiber (MTF) design incorporating gaps for leakage channels.
- To demonstrate the potential of this modified MTF for single-mode operation, enlarged mode area, and improved bending resistance.
Main Methods:
- Numerical investigation using the scalar finite-difference beam-propagation method algorithm.
- Analysis of a modified MTF design with varying high-index ring thickness, gap width, and bending orientation.
Main Results:
- Demonstrated potential for single-mode operation, mode area enlargement, and bending resistance.
- Achieved a high loss ratio (>50) between high-order and fundamental modes across a wide parameter range.
- Obtained an effective area of 920 μm² at 1050 nm with a 20 cm bend radius and a loss ratio >100.
Conclusions:
- The modified gap MTF design offers significant advantages in performance and fabrication tolerance.
- The proposed design is potentially manufacturable by modifying existing MTFs, suggesting practical viability.
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