Polarization dependence of grating-assisted waveguide Bragg reflectors

Area of Science:

• Optics and Photonics
• Integrated Photonics
• Waveguide Technology

Background:

• Waveguide Bragg reflectors are crucial components in integrated photonic circuits.
• Understanding polarization dependence is essential for device performance and design.
• Previous theoretical models often simplified the vectorial nature of light propagation.

Purpose of the Study:

• To theoretically investigate the polarization dependence of grating-assisted waveguide Bragg reflectors.
• To develop a criterion for selecting optimal waveguides for such devices.
• To validate theoretical predictions with experimental results.

Main Methods:

• Vectorial coupled-mode theory utilizing ideal mode expansion was employed for theoretical analysis.
• A specific criterion for ideal waveguide selection was proposed.
• Experimental measurements were conducted on ion-exchanged waveguides featuring etched gratings.

Main Results:

• The study successfully modeled the polarization dependence of grating-assisted waveguide Bragg reflectors.
• A practical criterion for ideal waveguide selection was established.
• Experimental data demonstrated excellent agreement with the theoretical predictions.

Conclusions:

• The vectorial coupled-mode theory provides an accurate framework for analyzing polarization effects in waveguide Bragg reflectors.
• The proposed selection criterion aids in designing efficient integrated photonic devices.
• Experimental validation confirms the robustness of the theoretical approach for ion-exchanged waveguides.