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Differential phase reconstruction of microcombs

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Abstract

Measuring microcombs in amplitude and phase provides unique insight into the nonlinear cavity dynamics, but spectral phase measurements are experimentally challenging. Here, we report a linear heterodyne technique assisted by electro-optic downconversion that enables differential phase measurement of such spectra with unprecedented sensitivity (−50 dBm) and bandwidth coverage (>110 nm in the telecommunications range). We validate the technique with a series of measurements, including single-cavity and photonic molecule microcombs.

© 2022 Optica Publishing Group

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Data availability

Data underlying the results presented in this paper are available in Ref. 29.

29. K. Twayana, "Differential phase reconstruction of microcombs," Zenodo (23 June 2022). https://doi.org/10.5281/zenodo.6710011

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