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Thinly coated hollow core fiber for improved thermal phase-stability performance
Optics Letters
|October 15, 2021
Summary
The coating on hollow core fibers (HCFs) significantly impacts thermal phase sensitivity and introduces relaxation effects. Optimizing the HCF wall thickness and coating minimizes these issues, achieving a ~30x lower sensitivity than standard single-mode fibers.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Optical fiber temperature sensitivity is crucial for sensing applications.
- Hollow core fibers (HCFs) offer lower thermal phase sensitivity than standard single-mode fibers (SSMFs), but reported improvements vary significantly.
- The influence of fiber coatings on HCF performance, particularly thermal phase sensitivity and stability, is not well understood.
Purpose of the Study:
- To investigate the impact of fiber coating on the thermal phase sensitivity of HCFs.
- To identify and analyze previously unreported relaxation effects in HCFs caused by coatings.
- To develop an optimized HCF design with reduced thermal sensitivity and improved stability.
Main Methods:
- Experimental characterization of thermal phase sensitivity in HCFs with varying coating thicknesses and wall structures.
- Numerical simulations to analyze the origin of relaxation effects attributed to coating viscoelasticity.
- Fabrication of a novel HCF with a thicker silica wall and thinner coating for performance optimization.
Main Results:
- Fiber coating significantly exacerbates thermal phase sensitivity in HCFs, especially those with thin silica walls.
- Previously undocumented optical phase relaxation effects, linked to the coating's viscoelastic properties, were observed and simulated.
- A newly designed HCF with a thicker wall (50µm) and thin coating (10µm) demonstrated an almost 30-fold reduction in thermal phase sensitivity compared to SSMFs.
- The optimized HCF exhibited no discernible relaxation effects while maintaining mechanical integrity.
Conclusions:
- Fiber coating is a critical factor influencing HCF thermal phase sensitivity and stability.
- Viscoelastic properties of the coating are responsible for observed relaxation effects in HCFs.
- Optimized HCF design, balancing wall thickness and coating, significantly enhances performance for temperature-insensitive applications.
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