4.5 Article

Low-Loss Directional Coupler for the C, L and U Bands Based on Subwavelength Gratings

期刊

IEEE PHOTONICS TECHNOLOGY LETTERS
卷 35, 期 24, 页码 1331-1334

出版社

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LPT.2023.3325660

关键词

Couplings; Bandwidth; Optical waveguides; Optical filters; Optical device fabrication; Wavelength measurement; Optical interferometry; Directional couplers; optical metamaterials; photonic integrated circuits

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In this study, a compact directional coupler based on subwavelength metamaterials is proposed to achieve arbitrary coupling ratios with low losses and a flat spectral response.
Directional couplers are ubiquitous components for power distribution in silicon photonics integrated circuits. Despite significant advances in their performance, architectures providing tailorable coupling ratios over increasingly broad bandwidths are still sought after. Compact footprint and low losses are also essential features for circuits comprising multiple coupling stages. In this work, we propose a compact directional coupler with arbitrary coupling ratio, based on dispersion engineering through subwavelength metamaterials. Low losses and a flat spectral response over a broad bandwidth are experimentally demonstrated for multiple coupling ratios between 0.08 and 1. Results show average excess losses below 0.24 dB and coupling ratio deviations below +/- 1 dB for a 170 nm bandwidth completely covering C, L and U telecommunication bands (1505 - 1675 nm).

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