Silicon photonic microresonator-based high-resolution line-by-line pulse shaping

Lucas M. Cohen (), Kaiyi Wu (), Karthik V. Myilswamy, Saleha Fatema, Navin B. Lingaraju and Andrew M. Weiner
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Lucas M. Cohen: Purdue University
Kaiyi Wu: Purdue University
Karthik V. Myilswamy: Purdue University
Saleha Fatema: Purdue University
Navin B. Lingaraju: The Johns Hopkins University Applied Physics Laboratory
Andrew M. Weiner: Purdue University

Nature Communications, 2024, vol. 15, issue 1, 1-9

Abstract: Abstract Optical pulse shaping stands as a formidable technique in ultrafast optics, radio-frequency photonics, and quantum communications. While existing systems rely on bulk optics or integrated platforms with planar waveguide sections for spatial dispersion, they face limitations in achieving finer (few- or sub-GHz) spectrum control. These methods either demand considerable space or suffer from pronounced phase errors and optical losses when assembled to achieve fine resolution. Addressing these challenges, we present a foundry-fabricated six-channel silicon photonic shaper using microresonator filter banks with inline phase control and high spectral resolution. Leveraging existing comb-based spectroscopic techniques, we devise a system to mitigate thermal crosstalk and enable the versatile use of our on-chip shaper. Our results demonstrate the shaper’s ability to phase-compensate six comb lines at tunable channel spacings of 3, 4, and 5 GHz. Specifically, at a 3 GHz channel spacing, we showcase the generation of arbitrary waveforms in the time domain. This scalable design and control scheme holds promise in meeting future demands for high-precision spectral shaping capabilities.

Date: 2024
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DOI: 10.1038/s41467-024-52051-9

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