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Dual interference effects in a line-by-line inscribed fiber Bragg grating
Optics Letters
|June 2, 2020
Summary
This study reveals dual interference effects in line-by-line inscribed Fiber Bragg Gratings (FBGs). These gratings exhibit both Fabry-Perot and Mach-Zehnder interference, offering new possibilities for optical devices.
Area of Science:
- Optics and Photonics
- Fiber Optic Sensing
- Nanophotonics
Background:
- Fiber Bragg Gratings (FBGs) are typically modeled as multi-cavity Fabry-Perot (FP) structures, enabling strong Bragg resonance via FP interference.
- Existing FBG fabrication methods often focus on achieving single interference modes, limiting their multifunctional capabilities.
Purpose of the Study:
- To investigate and demonstrate novel dual interference phenomena in line-by-line (LBL) inscribed FBGs.
- To explore the potential of LBL FBGs for advanced optical applications by combining different interference mechanisms.
Main Methods:
- Fabrication of LBL FBGs using a femtosecond laser.
- Experimental characterization of interference effects, including comparison with point-by-point inscribed FBGs.
- Analysis of polarization dependence of the observed interference patterns.
Main Results:
- Simultaneous observation of both FP interference and Mach-Zehnder Interference (MZI) effects in LBL FBGs.
- Dual interference effects were exclusively observed in LBL FBGs, not in point-by-point inscribed gratings.
- The MZI effect demonstrated significant polarization dependence.
Conclusions:
- LBL inscribed FBGs exhibit unique dual interference characteristics, combining FP and MZI effects.
- This dual-mode interference capability opens avenues for novel optical fiber devices.
- Potential applications include optical fiber communications, fiber lasers, and advanced multi-parameter sensor systems.
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