Polarization Insensitive Fiber-to-Chip Light Coupling to Aluminum Oxide/Silicon Augmented Low Index Waveguides

Fiber-to-chip light couplers with inverse tapers based on augmented low index guiding platform are designed. We show that sub-decibel coupling losses for standard fibers with 10.4-micron mode field diameter (MFD) are possible. A smaller MFD can conceivably result in an even smaller coupling loss.