Super-resolution AWGs based on the Moir\`e effect

TL;DR

This paper introduces a novel super-resolution AWG design utilizing the Moir ext`e effect, enabling higher spectral resolution without increasing device size or phase noise sensitivity.

Contribution

It presents a new approach that employs the Moir ext`e effect with two gratings of slightly different pitches to achieve super-resolution in AWGs.

Findings

Achieved 1 GHz channel spacing at 1550 nm wavelength

Maintained device footprint while enhancing spectral resolution

Provided theoretical foundation and design guidelines for super-resolution AWGs

Abstract

Enhancing spectral resolution in a conventional arrayed waveguide grating AWG requires a longer differential optical path, which expands the device footprint and increases sensitivity to phase noise. To overcome this limitation, we propose an innovative approach that maintains the AWG layout and introduces an additional splitter at the device input. Leveraging the Moir\`e effect, generated by two gratings with slightly different pitches, we demonstrate that the spacing of 7 channels multiplexer/demultiplexer can be reduced to $1$ GHz at the central wavelength of 1550 nm. We present the theoretical foundation for a super-resolution AWG and provide the corresponding design guidelines.