D. Eliyahu et al., BROADER, FLATTER OPTICAL-SPECTRA OF PASSIVELY MODE-LOCKED SEMICONDUCTOR-LASERS FOR A WAVELENGTH-DIVISION MULTIPLEXING SOURCE, Applied optics, 36(15), 1997, pp. 3430-3434
Using the time domain master equation for a complex electric-field pul
se envelope, we find analytical results for the optical spectra of pas
sively mode-locked semiconductor lasers. The analysis includes the eff
ect of optical nonlinearity of semiconductor lasers, which is characte
rized by a slow saturable amplifier and absorber. Group velocity dispe
rsion, bandwidth limiting, and self-phase modulation were considered a
s well. The FWHM of the spectrum profile was found to have a strong de
pendence on group velocity dispersion and self-phase modulation. For l
arge absolute values of the chirp parameter, the optical spectra resul
t in equispaced continuous wave frequencies, a large fraction of which
have equal power. (C) 1997 Optical Society of America.