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Direct extraction of the chirp parameter and higher order frequency chirp of ultrafast pulses via modulation-based mode-locked pulse characterization

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1 Author(s)
Weiguo Yang ; Department of Engineering & Technology, Kimmel School, Western Carolina University, Cullowhee, NC 28723, USA

We present experimental results of direct extraction of chirp parameter made possible by temporal phase retrieval measurements of ultrafast pulses. Results for a multi-spatial-mode mode-locked semiconductor laser at various bias points are presented. The comparison with the normally used root-mean-square (r.m.s.) chirp parameter reveals that the correlation of the r.m.s. chirp parameter with the actual pulse chirp is limited, especially for complex pulse shapes that may involve non-Gaussian spectral profiles and higher order chirps. The measurement methods and results are important in studying both the semiconductor laser mode-locking dynamics and the application of such ultrafast pulses.

Published in:

Southeastcon, 2011 Proceedings of IEEE

Date of Conference:

17-20 March 2011