Programmable broadband optical field spectral shaping with megahertz resolution using a simple frequency shifting loop

Côme Schnébelin, José Azaña and Hugues Guillet de Chatellus ()
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Côme Schnébelin: University Grenoble Alpes, CNRS, LIPhy
José Azaña: INRS-EMT, 800 de la Gauchetière Ouest, Suite 6900
Hugues Guillet de Chatellus: University Grenoble Alpes, CNRS, LIPhy

Nature Communications, 2019, vol. 10, issue 1, 1-11

Abstract: Abstract Controlling the temporal and spectral properties of light is crucial for many applications. Current state-of-the-art techniques for shaping the time- and/or frequency-domain field of an optical waveform are based on amplitude and phase linear spectral filtering of a broadband laser pulse, e.g., using a programmable pulse shaper. A well-known fundamental constraint of these techniques is that they can be hardly scaled to offer a frequency resolution better than a few GHz. Here, we report an approach for user-defined optical field spectral shaping using a simple scheme based on a frequency shifting optical loop. The proposed scheme uses a single monochromatic (CW) laser, standard fiber-optics components and low-frequency electronics. This technique enables efficient synthesis of hundreds of optical spectral components, controlled both in phase and in amplitude, with a reconfigurable spectral resolution from a few MHz to several tens of MHz. The technique is applied to direct generation of arbitrary radio-frequency waveforms with time durations exceeding 100 ns and a detection-limited frequency bandwidth above 25 GHz.

Date: 2019
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DOI: 10.1038/s41467-019-12688-3

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