Abstract
High efficiency coupling from fiber to slot and strip waveguides using a double-tip coupler is presented. The double tips are inverse tapered, while their distance is decreased. The coupling efficiency reaches 90.9% with a taper length of only 30μm for coupling fiber to slot waveguides. With a mode transformer, the slot waveguide mode can be converted to strip waveguide mode with an efficiency of 99.3% in a length of 15μm. The impact of several parameters, such as distance between tips, taper length, and tip-end width, are simulated and optimized to improve the coupling efficiency.
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