Abstract
A self-coherent optically-sampled analog-to-digital converter using a 90° optical hybrid coupler is experimentally demonstrated. It leverages practical, commercially available components and is used for high-resolution undersampling at 50Msps of up to 20GHz carrier frequencies. The measured ADC resolution is 9 effective bits for a 10GHz carrier frequency and shows little carrier frequency dependence from 6 to 20GHz.
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