  A shaped doublet pump pulse is proposed for simultaneous octave-spanning
soliton Kerr frequency comb generation and second-harmonic conversion in a
single microresonator. The temporal soliton in the cavity is trapped atop a
doublet pulse pedestal, resulting in a greatly expanded soliton region compared
to that with a general Gaussian pulse pump. The possibility of
single-microresonator comb self-referencing in a single silicon nitride
microring, which can facilitate compact on-chip optical clocks, is demonstrated
via simulation.
