On-chip transformation optics for multimode waveguide bends

Lucas H. Gabrielli, David Liu, Steven G. Johnson and Michal Lipson ()
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Lucas H. Gabrielli: School of Electrical and Computer Engineering, Cornell University
David Liu: Massachusets Institute of Technology
Steven G. Johnson: Massachusets Institute of Technology
Michal Lipson: School of Electrical and Computer Engineering, Cornell University

Nature Communications, 2012, vol. 3, issue 1, 1-6

Abstract: Abstract Current optical communication systems rely almost exclusively on multimode fibres for short- and medium-haul transmissions, and are now expanding into the long-haul arena. Ultra-high bandwidth applications are the main drive for this expansion, based on the ability to spatially multiplex data channels in multimode systems. Integrated photonics, on the other hand, although largely responsible for today’s telecommunications, continues to operate almost strictly in the single-mode regime. This is because multimode waveguides cannot be compactly routed on-chip without significant inter-mode coupling, which impairs their data rate and prevents the use of modal multiplexing. Here we propose a platform for on-chip multimode devices with minimal inter-mode coupling, opening up the possibilities for integrated multimode optics. Our work combines a novel theoretical approach—large-scale inverse design of transformation optics to maximize performance within fabrication constraints—with unique grayscale-lithography fabrication of an exemplary device: a low-crosstalk multimode waveguide bend.

Date: 2012
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DOI: 10.1038/ncomms2232

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