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We report all-optical synchronized multiplication by rational fractions of the modulation frequency of optical signals in self-pulsing two-section semiconductor laser diodes. The effect is based on the overlap of harmonics of the input signal with harmonics of the self-pulsation. We illustrate this new generic function with modelocked inputs rich in harmonics were fractions of 1,2, and 3 / 2 are generated, and we identify a number of applications for this effect.
Phelan, P., Farrell, G., Hegarty, J.: All-optical synchronisation and multiplication of the frequency of mode-locked signals. Photonics Technology Letters, 1992, Vol. 4, no. 12, pp.1332-1335.