Design concept for optical fibers with enhanced SBS threshold

Area of Science:

• Optics and Photonics
• Materials Science

Background:

• Stimulated Brillouin scattering (SBS) is a critical nonlinear effect in optical fibers, limiting high-power applications.
• Standard single-mode optical fibers have a fixed SBS threshold, restricting signal power.
• Optimizing fiber design is crucial for enhancing SBS threshold and enabling advanced optical systems.

Purpose of the Study:

• To develop a predictive criterion for the relative stimulated Brillouin scattering (SBS) threshold in single-mode optical fibers.
• To investigate the impact of different refractive index profiles on SBS threshold values.
• To demonstrate significant improvements in SBS threshold through tailored fiber design.

Main Methods:

• Theoretical modeling to establish a criterion for predicting SBS threshold.
• Fabrication of single-mode optical fibers with varied refractive index profiles.
• Experimental verification of predicted SBS thresholds using representative measurements.

Main Results:

• A novel criterion accurately predicts the relative SBS threshold for different fiber profiles.
• Experimental results confirm the predictive capability of the proposed criterion.
• Achieved an increase of over 3 dB in the SBS threshold compared to standard single-mode optical fibers through optimized profile design.

Conclusions:

• Refractive index profile engineering is an effective strategy to enhance SBS threshold in optical fibers.
• The proposed criterion provides a valuable tool for designing high-power optical fiber systems.
• Tailored fiber designs can overcome limitations imposed by SBS, paving the way for more robust optical communications and sensing applications.