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Timing Jitter Reduction of a Mode-Locked VECSEL Using an Optically Triggered SESAM

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7 Author(s)
Baili, G. ; Thales Res. & Technol., Palaiseau, France ; Alouini, M. ; Morvan, L. ; Dolfi, D.
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A technique for actively stabilizing the repetition rate of a mode-locked vertical external-cavity surface-emitting laser is presented using an optically triggered semiconductor saturable absorber mirror. This method enables a significant reduction of the timing jitter measured in the frequency range [100 Hz, 10 MHz] and makes this kind of externally locked laser suitable for high-speed sampling of microwave signals. The experimental demonstration shows jitter reduction by a factor of 16 from 8 ps down to 423 fs for a 1.68-GHz repetition rate pulse train. The hold-in locking bandwidth and stabilization efficiency are shown to be a function of the average power and modulation index of the optical control signal.

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Photonics Technology Letters, IEEE  (Volume:22 ,  Issue: 19 )