Ra. Salvatore et al., SUPERMODES OF HIGH-REPETITION-RATE PASSIVELY MODE-LOCKED SEMICONDUCTOR-LASERS, IEEE journal of quantum electronics, 32(6), 1996, pp. 941-952
We present a steady-state analysis of high-repetition-rate passively m
ode-locked semiconductor lasers. The analysis includes effects of ampl
itude-to-phase coupling in both gain and absorber sections. A many-mod
e eigenvalue approach is presented to obtain supermode solutions. Usin
g a nearest-neighbor mode coupling approximation, chirp-free pulse gen
eration and electrically chirp-controlled operation are explained for
the first time. The presence of a nonzero alpha parameter is found to
change the symmetry of the supermode and significantly reduce the mode
-locking range over which the lowest order supermode remains the minim
um gain solution. An increase in absorber strength tends to lead to do
wnchirped pulses. The effects of individual laser parameters are consi
dered, and agreement with recent experimental results is discussed.