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Loss optimization of transverse Bragg resonance waveguides
John M Choi1, Wei Liang, Yong Xu
1California Institute of Technology, M/S 136-93, 1200 East California Boulevard, Pasadena, California 91125, USA. johnchoi@caltech.edu
Summary
Propagation loss in transverse Bragg resonance (TBR) waveguides is minimized at discrete core widths. Finite-difference time-domain simulations confirm coupled-mode theory predictions for these low-loss waveguide designs.
Area of Science:
- Optics and Photonics
- Materials Science
Background:
- Transverse Bragg resonance (TBR) waveguides offer unique optical guiding properties.
- Understanding propagation loss is crucial for efficient waveguide design.
Purpose of the Study:
- To analyze guiding in a GaAs-based TBR waveguide structure with air holes.
- To identify conditions for minimized propagation loss.
Main Methods:
- Coupled-mode theory was employed for theoretical analysis.
- Two-dimensional finite-difference time-domain (FDTD) simulations were used for validation.
Main Results:
- Analysis predicted minimized propagation loss at discrete waveguide core widths.
- FDTD simulations showed good quantitative agreement with coupled-mode predictions.
- The existence of discrete core widths for low-loss propagation was corroborated.
Conclusions:
- Coupled-mode theory is applicable to TBR structures with significant index perturbations.
- Discrete core widths are essential for achieving low-loss propagation in TBR waveguides.