Abstract
We investigate polarization-insensitive waveguide designs afforded by the interplay of material and waveguide birefringence in LiNbO3-on-insulator photonic wires. Fundamental mode birefringence-free operation in the 0.8-1.8μm spectral range is predicted for a suitable choice of waveguide widths in the 375-600nm range. Optimized buried waveguide designs yield broadband (1350-1625nm) index matching between TE00 and TM00 modes. Furthermore, simultaneous phase- and group-velocity matching at infrared wavelengths appears feasible for pulse durations as short as 100fs.
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