Abstract
In this letter, we evaluate how the background noise is modified within a whiskered-shaped star coupler, optimized to reduce the reflectivity of its internal surfaces to reduce the back-scattered light. This letter is carried out by analyzing the Fabry–Perot interference due to the reflections between the input focal plane of the star coupler and the output facet of the waveguides. By comparing a whiskered star coupler with a standard one, we find a reduction in the star coupler reflectance of more than one order of magnitude. The experimental results are supported by a theoretical model and by numerical simulations.
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