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Proceedings Paper

Linewidth of mode combs of passively and actively mode-locked semiconductor laser diodes
Author(s): Yuichi Takushima; Hideyuki Sotobayashi; Matthew E. Grein; Erich P. Ippen; Hermann A. Haus
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Paper Abstract

We derive the Schawlow-Townes linewidth of mode-locked lasers, and discuss how the timing jitter affects the linewidth in passively/actively mode-locked laser diodes (MLLD's). The linewidth of longitudinal modes of MLLD's is much broader than the Schawlow-Townes linewidth due to the linewidth enhancement factor of the gain medium, and its characteristics depend on whether the laser is mode-locked passively or actively. For the case of active mode-locking, the detuning of the modulation frequency from the natural cavity frequency broadens the linewidth. In the experiment, we measure the linewidth of 10-GHz external cavity MLLD's and investigate the correlation with the noise characteristics of timing jitter and amplitude noise of the pulse train. The experimental results agree well with theoretical predictions.

Paper Details

Date Published: 25 October 2004
PDF: 15 pages
Proc. SPIE 5595, Active and Passive Optical Components for WDM Communications IV, (25 October 2004); doi: 10.1117/12.580046
Show Author Affiliations
Yuichi Takushima, Massachusetts Institute of Technology (United States)
Hideyuki Sotobayashi, Massachusetts Institute of Technology (United States)
Matthew E. Grein, Massachusetts Institute of Technology (United States)
Erich P. Ippen, Massachusetts Institute of Technology (United States)
Hermann A. Haus, Massachusetts Institute of Technology (United States)


Published in SPIE Proceedings Vol. 5595:
Active and Passive Optical Components for WDM Communications IV
Achyut Kumar Dutta; Abdul Ahad Sami Awwal; Niloy K. Dutta; Yasutake Ohishi, Editor(s)

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