Linewidth narrowing of the radio frequency beat-tones and the optical-modes is experimentally investigated in
a ∼40 GHz quantum-dash mode-locked laser diode subject to optical injection of 10 GHz pulses. In comparison
to the 75 kHz linewidth exhibited by the beat-tones in passive mode-locking conditions, a remarkable reduction
to less than 8 Hz is achieved when the laser is under optical injection. From this beat-tone signal, an integrated
root-mean-square timing jitter of 64 fs is calculated. In addition, a quadratic profile of the optical linewidth with
the wavelength is observed in active locking, reaching a minimum of 1:7 MHz for the longitudinal modes around
1530 nm and progressively increasing to 37:4 MHz for modes at 1525 nm.
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Funders:
Enterprise Ireland under the program CFTD/2009/0303, Higher Education Authority Program for Research in Third Level Institutions (2007-2011) via the INSPIRE Program, Irish Research Council for Science, Engineering and Technology
ID Code:
24250
Deposited On:
28 Feb 2020 14:25 by
Pascal Landais
. Last Modified 03 Sep 2020 10:34