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Arbitrary Ratio Three Waveguide Beam Splitter using Shortcuts to Adiabaticity

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Abstract

One of the most fundamental devices for integrated optics is the beam splitter, which is often realized with a directional coupler. However, it is well known that the robustness of such devices against wavelength and/or fabrication parameter variations is limited. Three waveguide couplers based on the quantum-optical analogy of the stimulated Raman Adiabatic Passage (STIRAP) protocol have emerged as a promising solution to the aforementioned issues of device robustness [1, 2]. The tradeoff is that the adiabatic devices are generally longer than their non-adiabatic counterparts. Recently, devices using shortcuts to adiabaticity [3] have been shown to provide alternative robust beam coupling as the adiabatic devices, but at a shorter device length [4]. In this paper, we use the invariant-based inverse engineering [5] to realize a short and robust arbitrary splitting ratio three waveguide beam splitter.

© 2014 Japan Society of Applied Physics, Optical Society of America

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