Numerical model for enhancing stimulated Brillouin scattering in optical microfibers

Area of Science:

• Photonics and Optical Engineering
• Nonlinear Optics
• Materials Science

Background:

• Stimulated Brillouin scattering (SBS) has limitations in high-power photonic applications due to optical power constraints.
• Enhancing SBS is crucial for applications like slow light generation, sensing, and amplification.
• Interest is growing in improving Brillouin frequency shift and Brillouin gain for broader SBS utility.

Purpose of the Study:

• To develop and utilize a numerical model for enhancing SBS in optical fibers.
• To investigate the interaction between acoustic and optical modes within optical fibers.
• To analyze the impact of fiber parameters on SBS characteristics.

Main Methods:

• A fully vectorial finite element method (FEM) numerical model was employed.
• Analysis of longitudinal, shear, and hybrid acoustic modes interacting with optical modes.
• Investigated the influence of core radius, clad radius, and effective refractive index.

Main Results:

• Observed differences in Brillouin shift frequency between standard silica fibers and microfibers.
• Demonstrated the effect of varying core radii on Brillouin shift.
• Quantified the impact of fiber dimensions and refractive index on Brillouin gain and frequency shift.

Conclusions:

• The numerical model provides a method for enhancing SBS in optical fibers.
• Fiber parameters significantly influence Brillouin frequency shift and gain.
• The model can be extended to study surface Brillouin scattering and various waveguide structures.