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Narrow line width frequency comb source based on an injection-locked III-V-on-silicon mode-locked laser

: Uvin, S.; Keyvaninia, S.; Lelarge, F.; Duan, G.-H.; Kuyken, B.; Roelkens, G.

Volltext ()

Optics Express 24 (2016), Nr.5, S.5277-5286
ISSN: 1094-4087
Zeitschriftenaufsatz, Elektronische Publikation
Fraunhofer HHI ()

In this paper, we report the optical injection locking of an L-band (similar to 1580 nm) 4.7 GHz III-V-on-silicon mode-locked laser with a narrow line width continuous wave (CW) source. This technique allows us to reduce the MHz optical line width of the mode-locked laser longitudinal modes down to the line width of the source used for injection locking, 50 kHz. We show that more than 50 laser lines generated by the mode-locked laser are coherent with the narrow line width CW source. Two locking techniques are explored. In a first approach a hybrid mode-locked laser is injection-locked with a CW source. In a second approach, light from a modulated CW source is injected in a passively mode-locked laser cavity. The realization of such a frequency comb on a chip enables transceivers for high spectral efficiency optical communication.