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Type: Journal article
Title: Gratingless integrated tunneling multiplexer for terahertz waves
Author: Headland, D.
Withayachumnankul, W.
Fujita, M.
Nagatsuma, T.
Citation: Optica, 2021; 8(5):621-629
Publisher: The Optical Society
Issue Date: 2021
ISSN: 2334-2536
Statement of
Daniel Headland, Withawat Withayachumnankul, Masayuki Fujita and Tadao Nagatsuma
Abstract: The arrayed waveguide grating (AWG) is a versatile and scalable passive photonic multiplexer that sees widespread usage. However, the necessity of a waveguide array engenders large device size, and gratings invariably commute finite power into undesired diffraction orders. Here, we demonstrate AWG-like functionality without a grating or waveguide array, yielding benefits to compactness, bandwidth, and efficiency. To this end, we exploit optical tunneling from a dielectric waveguide to an adjacent slab in order to realize a slab-confined frequency-scanning beam, which is manipulated using in-slab beamforming techniques that we have developed in order to separate distinct frequency bands. In this way, we devise an all-intrinsic-silicon integrated 4×1 frequency-division terahertz multiplexer, which is shown to support aggregate data rates up to 48 Gbit/s with an on–off-keying modulation scheme, operating in the vicinity of 350 GHz. Our investigation targets the terahertz range, to provide a critical missing building block for future high-volume wireless communications networks.
Rights: © 2021 Optical Society of America under the terms of the OSA Open Access Publishing Agreement
DOI: 10.1364/OPTICA.420715
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