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Experimental investigations of harmonic synchronization conditions and mechanisms of mode-locked laser diodes induced by optical-pulse injection

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3 Author(s)
Kurita, H. ; Labs. of Opto-Electron. Res., NEC Corp., Tsukuba, Japan ; Shimizu, T. ; Yokoyama, Hiroyuki

We investigated the detailed characteristics of synchronization of mode-locked laser diodes (MLLD's) by subharmonic optical pulse injection. It was shown that optical harmonic injection mode-locking was not very sensitive to injection pulse shapes. In the time domain, subharmonic injection pulses were multiplexed inside the MLLD and these multiplexed pulses effectively modulated the absorbance of the saturable absorber at the MLLD's repetition frequency. It was also found in the spectral domain that injection pulse trains should have optical spectrum components broader than the MLLD's intermode spacing, and injection spectral components should couple to at least two modes of the MLLD

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Selected Topics in Quantum Electronics, IEEE Journal of  (Volume:2 ,  Issue: 3 )