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Sensitivity improvement of reflective tilted FBGs
Applied Optics
|May 4, 2016
Summary
Decreasing the cladding radius in tilted fiber Bragg gratings enhances energy transfer to cladding modes. This improves sensitivity for refractive index sensing applications.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Tilted fiber Bragg gratings (TFBGs) couple core and cladding modes.
- Cladding modes are crucial for sensing applications due to their sensitivity to the surrounding refractive index.
Purpose of the Study:
- To investigate the theoretical behavior of cladding modes in optical fibers.
- To determine how to enhance the coupling efficiency from core to cladding modes for improved sensing.
Main Methods:
- Theoretical analysis using a three-layer model for cladding modes and a two-layer model for the core mode.
- Studying the electric field distribution to understand energy transfer mechanisms.
Main Results:
- Decreasing the cladding radius increases the coupling of energy from the core mode to cladding modes.
- The electric field distribution changes significantly with cladding radius variations.
Conclusions:
- Reduced cladding radius is an effective method to enhance core-to-cladding mode coupling.
- This enhancement leads to improved sensitivity in refractive index sensing using TFBGs.
