All-fibre phase filters with 1-GHz resolution for high-speed passive optical logic processing

Saket Kaushal, A. Aadhi, Anthony Roberge, Roberto Morandotti, Raman Kashyap and José Azaña ()
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Saket Kaushal: Institut National de la Recherche Scientifique
A. Aadhi: Institut National de la Recherche Scientifique
Anthony Roberge: Polytechnique Montréal
Roberto Morandotti: Institut National de la Recherche Scientifique
Raman Kashyap: Polytechnique Montréal
José Azaña: Institut National de la Recherche Scientifique

Nature Communications, 2023, vol. 14, issue 1, 1-10

Abstract: Abstract Photonic-based implementation of advanced computing tasks is a potential alternative to mitigate the bandwidth limitations of electronics. Despite the inherent advantage of a large bandwidth, photonic systems are generally bulky and power-hungry. In this respect, all-pass spectral phase filters enable simultaneous ultrahigh speed operation and minimal power consumption for a wide range of signal processing functionalities. Yet, phase filters offering GHz to sub-GHz frequency resolution in practical, integrated platforms have remained elusive. We report a fibre Bragg grating-based phase filter with a record frequency resolution of 1 GHz, at least 10× improvement compared to a conventional optical waveshaper. The all-fibre phase filter is employed to experimentally realize high-speed fully passive NOT and XNOR logic operations. We demonstrate inversion of a 45-Gbps 127-bit random sequence with an energy consumption of ~34 fJ/bit, and XNOR logic at a bit rate of 10.25 Gbps consuming ~425 fJ/bit. The scalable implementation of phase filters provides a promising path towards widespread deployment of compact, low-energy-consuming signal processors.

Date: 2023
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DOI: 10.1038/s41467-023-37472-2

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