Abstract
We propose a method to efficiently pump an excited mode of a multimode optical waveguide starting from a fundamental-mode input by combining Stark-Chirped Rapid Adiabatic Passage (SCRAP) and Supersymmetry (SUSY) transformations. In a two-waveguide set, we implement SCRAP by modulating the core refractive index of one waveguide, which is evanescently coupled to its SUSY partner. SCRAP provides an efficient transfer of light intensity between the modes of different waveguides, while SUSY allows to control which modes are supported. Using both techniques allows to achieve fidelities above 99% for the pumping of the excited mode of a two-mode waveguide. Additionally, we show that SCRAP can be exploited to spatially separate superpositions of fundamental and excited modes, and how SUSY can also improve the results for this application.
Highlights
Multimode optical waveguides and fibers [1] provide a solution to the increasing demand of transmission capacity for optical devices [2]
Our objective is to show how the combination of Stark-Chirped Rapid Adiabatic Passage (SCRAP) and SUSY can be exploited to faithfully pump excited modes of multimode waveguides and to spatially separate superpositions of different modes, both challenges of high importance in the context of Mode-Division Multiplexing (MDM)
We apply SCRAP combined with SUSY to efficiently transfer light intensity between multimode waveguides
Summary
Multimode optical waveguides and fibers [1] provide a solution to the increasing demand of transmission capacity for optical devices [2]. Compared with single-mode waveguides, they offer an effective additional dimensionality to the system by allowing to use each guided mode as an independent information channel. This is known as Mode-Division Multiplexing (MDM) [3,4,5,6], one of the different Multiplexing techniques that have been developed to increase the transmission possibilities of these optical devices [7]. The possibility of precisely pumping excited modes of general multimode waveguides without the need of complicated input fields is of high interest for current and future applications
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