G. Griffel et al., 2-SECTION GAIN-LEVERED TUNABLE DISTRIBUTED-FEEDBACK LASER WITH ACTIVETUNING SECTION, IEEE journal of quantum electronics, 30(1), 1994, pp. 15-18
A composite cavity semiconductor laser structure that consists of two
active (gain) sections is analyzed. One of the sections has a grating
corrugation, while the other is flat. The operation of the device is e
nhanced by utilizing the gain-lever effect. A round-trip analysis is c
ombined with the rate equations pertinent for this structure to study
the characteristics of the device. The performance of the device is co
mpared to that of a similar case without the gain lever. It is shown t
hat, utilizing the gain-lever effect, improved operation in terms of t
uning range, modulation efficiency, and output power control can be ob
tained.