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Differential phase reconstruction of microcombs
preprintposted on 2023-01-12, 15:51 authored by Krishna Twayana, Fuchuan Lei, Zhichao Ye, Israel Rebolledo-Salgado, Oskar B. Helgason, Magnus Karlsson, Victor Torres-Company
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.