We show how time warps caused by nonuniform wavelength-to-time mapping in the photonic time-stretch analog-to-digital converter (ADC) can be digitally measured and removed. This is combined with digital correction of wavelength-dependent Mach–Zehnder modulator (MZM) bias offset to attain a $10\mathrm{GHz}$ bandwidth digitizer with $>7$ effective bits of resolution and $52\mathrm{dB}$ spur-free dynamic range. To the best of our knowledge, this is the highest resolution ADC in $10\mathrm{GHz}$ bandwidth range, with at least 1 order of magnitude higher signal-to-noise ratio than ever achieved. We also demonstrate concatenation of 30 wavelength interleaved time segments with high fidelity on the path to achieving continuous time operation.

© 2008 Optical Society of America

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