B. Wu et al., ON DISTRIBUTED MICROWAVE EFFECTS IN SEMICONDUCTOR-LASERS AND THEIR PRACTICAL IMPLICATIONS, Applied physics letters, 67(4), 1995, pp. 467-469
Recently, it has been shown that when a semiconductor laser is directl
y modulated at high frequencies, the modulation signals suffer substan
tial loss and phase shift propagating from the wire feed point along t
he length of the laser. It was suggested that these distributed microw
ave effects lead to a further bandwidth degradation in electrical curr
ent injection over the single-pole roll-off predicted by a lumped RC m
odel. We show, however, that this degradation is significant only when
the laser is driven directly by a voltage source. In contrast, when t
he laser is driven, commonly, through a 50 Omega transmission line the
degradation is minimal, and the total injection current is still RC l
imited. (C) 1995 American Institute of Physics.