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Electrical injection locking dynamics of a monolithic edge-emitting semiconductor quantum dash frequency comb laser are investigated experimentally by beat note spectroscopy. Spectrally resolved phase and amplitude characteristics across the 10 nm broad optical comb spectra and an inter-mode beat frequency locking dynamics are reported. A locking range of 2 MHz around the fundamental repetition rate of 20 GHz and an inter-mode beat line width reduction to the line width of the electrical radio-frequency signal source are attained.
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