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The use of a thin, low-index liner layer over a surface grating covered by a high-index cover layer in a III-V alloy waveguide significantly improves the coupling efficiency of grating couplers, and therefore, reduces the length of such couplers by an order of magnitude. The same low-index liner and high-index cover layer can also reduce losses between transition sections of photonic integrated circuits...
A thin, low-index liner layer and a high-index cover layer over a surface grating in a III–V waveguide theoretically increases the outcoupling efficiency by one or two orders of magnitude. The liner and cover layer also reduces losses between waveguide components such as distributed feedback (DBR) or grating out-coupler region.
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