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Published May 20, 1997 | Published
Journal Article Open

Broader, flatter optical spectra of passively mode-locked semiconductor lasers for a wavelength-division multiplexing source

Abstract

Using the time domain master equation for a complex electric-field pulse envelope, we find analytical results for the optical spectra of passively mode-locked semiconductor lasers. The analysis includes the effect of optical nonlinearity of semiconductor lasers, which is characterized by a slow saturable amplifier and absorber. Group velocity dispersion, bandwidth limiting, and self-phase modulation were considered as well. The FWHM of the spectrum profile was found to have a strong dependence on group velocity dispersion and self-phase modulation. For large absolute values of the chirp parameter, the optical spectra result in equispaced continuous wave frequencies, a large fraction of which have equal power.

Additional Information

© 1997 Optical Society of America. Received 15 September 1996; revised manuscript received 13 November 1996. The authors are pleased to acknowledge Roger G. M. P. Koumans for useful discussions. This research was supported by the Advanced Research Projects Agency.

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