Watts, R;Rosales, R;Lelarge, F;Ramdane, A;Barry, L

2012

May

Optics Letters

Mode coherence measurements across a 1.5 THz spectral bandwidth of a passively mode-locked quantum dash laser

Published

17 ()

LINEWIDTH AMPLITUDE

37

1499

1501

The mode coherence of adjacent and non-adjacent spectral modes of a passively mode locked quantum dash (QDash) semiconductor laser are deduced through radio frequency beat-tone linewidth measurements. A wavelength conversion scheme that uses degenerate four wave mixing in a semiconductor optical amplifier is proposed which considerably extends the mode spacing beyond the limit imposed by conventional fast-photodetection and electrical spectrum analysis of around 100 GHz. Using this scheme, the mode coherence of the QDash laser was measured out to the thirty-first harmonic, or a mode separation of 1.5 THz. (C) 2012 Optical Society of America

WASHINGTON

0146-9592